Professor Rahim Tafazolli

Head of the Centre for Communication Systems Research (CCSR)

Email:
Phone: Work: 01483 68 9834
Room no: 18 BA 02

Further information

Publications

Journal articles

  • He Z, Ma Y, Tafazolli R. (2012) 'A High Accuracy Mobile Positioning Approach in IEEE 802.11a WLANs'. IEICE IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, E95-A (10), pp. 1776-1779.
    doi: 10.1587/transfun.E0.A.1
  • Akbari A, Heliot F, Imran MA, Tafazolli R. (2012) 'Energy Efficiency Contours for Broadcast Channels Using Realistic Power Models'. IEEE Transactions on Wireless Communications, 11 (11), pp. 4017-4025.
    doi: 10.1109/TWC.2012.112207
    Full text is available at: http://epubs.surrey.ac.uk/725969/

    Abstract

    Energy savings are becoming a global trend, hence the importance of energy efficiency (EE) as an alternative performance evaluation metric. This paper proposes an EE based resource allocation method for the broadcast channel (BC), where a linear power model is used to characterize the power consumed at the base station (BS). Having formulated our EE based optimization problem and objective function, we utilize standard convex optimization techniques to show the concavity of the latter, and thus, the existence of a unique globally optimal energy-efficient rate and power allocation. Our EE based resource allocation framework is also extended to incorporate fairness, and provide a minimum user satisfaction in terms of spectral efficiency (SE). We then derive the generic equation of the EE contours and use them to get insights about the EE-SE trade-off over the BC. The performances of the aforementioned resource allocation schemes are compared for different metrics against the number of users and cell radius. Results indicate that the highest EE improvement is achieved by using the unconstrained optimization scheme, which is obtained by significantly reducing the total transmit power. Moreover, the network EE is shown to increase with the number of users and decrease as the cell radius increases.

  • He Z, Ma Y, tafazolli R. (2012) 'Posterior Cramér-Rao Bound for Inertial Sensors Enhanced Mobile Positioning Under The Random Walk Motion Model'. IEEE IEEE Wireless Communications Letters, (99), pp. 1-4.
    doi: 10.1109/WCL.2012.091312.120617
    Full text is available at: http://epubs.surrey.ac.uk/730263/

    Abstract

    This letter presents a new posterior Cramér-Rao bound (PCRB) for inertial sensors enhanced mobile positioning, which performs hybrid data fusion of parameters including position estimates, pedestrian step size, pedestrian heading, and the knowledge of random walk motion model. Moreover, a non-matrix closed form of the PCRB is derived without position estimates. Finally, our numerical results show that when the accuracy of step size and heading measurements is high enough, the knowledge of random walk model becomes redundant.

  • Vural S, Navaratnam P, Tafazolli R. (2012) 'Transmission Range Assignment for Backbone Connectivity in Clustered Wireless Networks'. IEEE Wireless Communications Letters,
    doi: 10.1109/WCL.2012.101812.120541
  • He Z, Ma Y, Tafazolli R. (2012) 'Opportunistic Cooperative Positioning in OFDMA Systems'. IEICE IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Vol.E95-A (9), pp. 1642-1645.
    doi: 10.1587/transfun.E95.A.1642
  • Guo T, Quddus AU, Wang N, Tafazolli R. (2012) 'Local Mobility Management for Networked Femtocells Based on X2 Traffic Forwarding'. IEEE IEEE Transactions on Vehicular Technology,
    doi: 10.1109/TVT.2012.2215929
  • Heliot F, Imran MA, Tafazolli R. (2012) 'Energy-efficient Power Allocation for Point-to-point MIMO System over the Rayleigh Fading Channel'. IEEE IEEE Wireless Communications Letters, 1 (4), pp. 304-307.
    doi: 10.1109/WCL.2012.042512.120147
  • He Z, Ma Y, Tafazolli R. (2012) 'Training Convergence in Range-based Cooperative Positioning with Stochastic Positional Knowledge'. IEICE IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, E95.A (7), pp. 1200-1204.
    doi: 10.1587/transfun.E0.A.1
  • Vural S, Navaratnam P, Hunt B, Wang N, Tafazolli R. (2012) 'Distributed Clustering of Large-Scale Wireless Heterogeneous Machine-to-Machine Networks'. IEEE Transactions on Wireless Communications,
    [ Status: Submitted ]
  • Xiao P, Tafazolli R, Moessner K, Gluhak A. (2012) 'Codebook Based Single-User MIMO System Design with Widely Linear Processing'. IEEE Transactions on Communications,
    doi: 10.1109/TCOMM.2012.060112.110155
    Full text is available at: http://epubs.surrey.ac.uk/711385/

    Abstract

    This work addresses joint transceiver optimization for multiple-input, multiple-output (MIMO) systems. In practical systems the complete knowledge of channel state information (CSI) is hardly available at transmitter. To tackle this problem, we resort to the codebook approach to precoding design, where the receiver selects a precoding matrix from a finite set of pre-defined precoding matrices based on the instantaneous channel condition and delivers the index of the chosen precoding matrix to the transmitter via a bandwidth-constraint feedback channel. We show that, when the symbol constellation is improper, the joint codebook based precoding and equalization can be designed accordingly to achieve improved performance compared to the conventional system.

  • Heliot F, Imran MA, Tafazolli R. (2012) 'A Very Tight Approximation of the SISO Energy Efficiency-Spectral Efficiency Trade-Off'. IEEE Communications Letters,
    doi: 10.1109/LCOMM.2012.042512.120253
    Full text is available at: http://epubs.surrey.ac.uk/710806/

    Abstract

    Beside the well-established spectral-efficiency (SE), energy-efficiency (EE) is currently becoming an important performance evaluation metric, which in turn makes the EE-SE trade-off as a prominent criterion for efficiently designing future communication systems. In this letter, we propose a very tight closed-form approximation (CFA) of this trade-off over the single-input single-output (SISO) Rayleigh flat fading channel. We first derive an improved approximation of the SISO ergodic capacity by means of a parametric function and then utilize it for obtaining our novel EE-SE trade-off CFA, which is also generalized for the symmetric multi-input multi-output channel. We compare our CFA with existing CFAs and show its improved accuracy in comparison with the latter.

  • Heliot F, Imran MA, Tafazolli R. (2012) 'On the Energy Efficiency-Spectral Efficiency Trade-Off over the MIMO Rayleigh Fading Channel'. IEEE IEEE Transactions on Communications, 60 (5), pp. 1345-1356.
    doi: 10.1109/TCOMM.2012.031712.110215
    Full text is available at: http://epubs.surrey.ac.uk/710812/

    Abstract

    Along with spectral efficiency (SE), energy efficiency (EE) is becoming one of the key performance evaluation criteria for communication system. These two criteria, which are conflicting, can be linked through their trade-off. The EE-SE trade-off for the multi-input multi-output (MIMO) Rayleigh fading channel has been accurately approximated in the past but only in the low-SE regime. In this paper, we propose a novel and more generic closed-form approximation of this trade-off which exhibits a greater accuracy for a wider range of SE values and antenna configurations. Our expression has been here utilized for assessing analytically the EE gain of MIMO over single-input single-output (SISO) system for two different types of power consumption models (PCMs): the theoretical PCM, where only the transmit power is considered as consumed power; and a more realistic PCM accounting for the fixed consumed power and amplifier inefficiency. Our analysis unfolds the large mismatch between theoretical and practical MIMO vs. SISO EE gains; the EE gain increases both with the SE and the number of antennas in theory, which indicates that MIMO is a promising EE enabler; whereas it remains small and decreases with the number of transmit antennas when a realistic PCM is considered.

  • Akbari A, Heliot F, Imran MA, Tafazolli R. (2012) 'Energy Efficiency Contours for Broadcast Channels Using Realistic Power Models'. IEEE IEEE Transactions on Wireless Communications, 11 (11), pp. 4017-4025.
    doi: 10.1109/TWC.2012.091812.112207
  • Cheraghi P, Ma Y, Tafazolli R, Lu Z. (2012) 'Cluster based differential energy detection for spectrum sensing in multi-carrier systems'. IEEE IEEE Transactions on Signal Processing, 60 (12), pp. 6450-6464.
    doi: 10.1109/TSP.2012.2212434
    Full text is available at: http://epubs.surrey.ac.uk/737051/
  • Pateromichelakis E, Shariat M, Quddus A, Tafazolli R. (2012) 'On the Evolution of Multi-cell Scheduling in 3GPP LTE / LTE-A'. IEEE Communcations Surveys & Tutorials,
    doi: 10.1109/SURV.2012.071812.00127
  • Wei D, Jin Y, Vural S, Moessner K, Tafazolli R. (2012) 'An Energy-efficient Clustering Solution for Wireless Sensor Networks'. IEEE IEEE Transactions on Wireless Communications, United Kingdom: PP (99), pp. 1-11.
    doi: 10.1109/TWC.2011.092011.110717
    Full text is available at: http://epubs.surrey.ac.uk/123373/

    Abstract

    Hot spots in a wireless sensor network emerge as locations under heavy traffic load. Nodes in such areas quickly deplete energy resources, leading to disruption in network services. This problem is common for data collection scenarios in which Cluster Heads (CH) have a heavy burden of gathering and relaying information. The relay load on CHs especially intensifies as the distance to the sink decreases. To balance the traffic load and the energy consumption in the network, the CH role should be rotated among all nodes and the cluster sizes should be carefully determined at different parts of the network. This paper proposes a distributed clustering algorithm, Energy-efficient Clustering (EC), that determines suitable cluster sizes depending on the hop distance to the data sink, while achieving approximate equalization of node lifetimes and reduced energy consumption levels. We additionally propose a simple energy-efficient multihop data collection protocol to evaluate the effectiveness of EC and calculate the end-to-end energy consumption of this protocol; yet EC is suitable for any data collection protocol that focuses on energy conservation. Performance results demonstrate that EC extends network lifetime and achieves energy equalization more effectively than two well-known clustering algorithms, HEED and UCR.

  • Imran MA, Imran A, tafazolli R. (2011) 'Relay Station Access Link Spectral Efficiency Optimization through SO of Macro BS Tilts'. IEEE IEEE Communications Letters, 15 (12), pp. 1326-1328.
    doi: 10.1109/LCOMM.2011.103111.1579
    Full text is available at: http://epubs.surrey.ac.uk/711386/

    Abstract

    In this paper we present a novel framework for spectral efficiency enhancement on the access link between relay stations and their donor base station through Self Organization (SO) of system-wide BS antenna tilts. Underlying idea of framework is inspired by SO in biological systems. Proposed solution can improve the spectral efficiency by upto 1 bps/Hz.

  • Akbari A, Imran MA, Tafazolli R, Dianati M. (2011) 'Energy Efficiency Contours for Single-Carrier Downlink Channels'. IEEE IEEE Communications Letters, 15 (12), pp. 1307-1309.
    doi: 10.1109/LCOMM.2011.103111.111519
    Full text is available at: http://epubs.surrey.ac.uk/710809/

    Abstract

    Energy efficiency has become an important aspect of wireless communication, both economically and environmentally. This letter investigates the energy efficiency of downlink AWGN channels by employing multiple decoding policies. The overall energy efficiency of the system is based on the bits-per-joule metric, where energy efficiency contours are used to locate the optimal operating points based on the system requirements. Our novel approach uses a linear power model to define the total power consumed at the base station, encompassing the circuit and processing power, and amplifier efficiency, and ensures that the best energy efficiency value can be achieved whilst satisfying other system targets such as QoS and rate-fairness.

  • Qi Y, Imran MA, Hoshyar R, Tafazolli R. (2011) 'H2-ARQ Relaying: Spectrum and Energy Efficiency Analysis'. IEEE IEEE Journal on Selected Areas in Communications, 29 (8), pp. 1547-1558.
    doi: 10.1109/JSAC.2011.110905
    Full text is available at: http://epubs.surrey.ac.uk/123391/

    Abstract

    In this paper, we propose novel Hybrid Automatic Repeat re-Quest (HARQ) strategies used in conjunction with hybrid relaying schemes, named as H^2-ARQ-Relaying. The strategies allow the relay to dynamically switch between amplify-and-forward/compress-and-forward and decode-and-forward schemes according to its decoding status. The performance analysis is conducted from both the spectrum and energy efficiency perspectives. The spectrum efficiency of the proposed strategies, in terms of the maximum throughput, is significantly improved compared with their non-hybrid counterparts under the same constraints. The consumed energy per bit is optimized by manipulating the node activation time, the transmission energy and the power allocation between the source and the relay. The circuitry energy consumption of all involved nodes is taken into consideration. Numerical results shed light on how and when the energy efficiency can be improved in cooperative HARQ. For instance, cooperative HARQ is shown to be energy efficient in long distance transmission only. Furthermore, we consider the fact that the compress-and-forward scheme requires instantaneous signal to noise ratios of all three constituent links. However, this requirement can be impractical in some cases. In this regard, we introduce an improved strategy where only partial and affordable channel state information feedback is needed.

  • Ma Y, Tafazolli R, Zhang Y, Qian C. (2011) 'Adaptive Modulation for Opportunistic Decode-and-Forward Relaying'. IEEE IEEE Transactions on Wireless Communications, 10 (7), pp. 2017-2022.
    doi: 10.1109/TWC.2011.051311.091773
  • Akbari A, Imran MA, Hoshyar R, Amich A, Tafazolli R. (2011) 'Average Energy Efficiency Contours with Multiple Decoding Policies'. IEEE IEEE Communications Letter, 15 (5), pp. 506-508.
    doi: 10.1109/LCOMM.2011.040111.102287
    Full text is available at: http://epubs.surrey.ac.uk/533675/

    Abstract

    This letter addresses energy-efficient design in multi-user, single-carrier uplink channels by employing multiple decoding policies. The comparison metric used in this study is based on average energy efficiency contours, where an optimal rate vector is obtained based on four system targets: Maximum energy efficiency, a trade-off between maximum energy efficiency and rate fairness, achieving energy efficiency target with maximum sum-rate and achieving energy efficiency target with fairness. The transmit power function is approximated using Taylor series expansion, with simulation results demonstrating the achievability of the optimal rate vector, and negligible performance difference in employing this approximation.

  • Hanzo L, Tafazolli R. (2011) 'QoS-aware routing and admission control in shadow-fading environments for multirate MANETs'. IEEE Transactions on Mobile Computing, 10 (5), pp. 622-637.
    doi: 10.1109/TMC.2010.208
  • Akbari A, Imran MA, Hoshyar R, Amich A, Tafazolli R. (2011) 'Average energy efficiency contours with multiple decoding policies'. IEEE Communications Letters, 15 (5), pp. 506-508.
    doi: 10.1109/LCOMM.2011.040111.102287
  • Hanzo II L, Tafazolli R. (2011) 'The effects of shadow-fading on QoS-aware routing and admission control protocols designed for multi-hop MANETs'. Wireless Communications and Mobile Computing, 11 (1), pp. 1-22.
    doi: 10.1002/wcm.912
  • Héliot F, Hoshyar R, Tafazolli R. (2011) 'An accurate closed-form approximation of the distributed MIMO outage probability'. IEEE Transactions on Wireless Communications, 10 (1), pp. 5-11.
    doi: 10.1109/TWC.2010.110910.091069
  • Quddus AU, Guo T, Shariat M, Hunt B, Imran A, Ko Y, Tafazolli R. (2010) 'Next Generation Femtocells: An Enabler for High Efficiency Multimedia Transmission'. IEEE IEEE Comsoc MMTC E-Letters, 5 (5), pp. 27-31.
  • Yi N, Ma Y, Tafazolli R. (2010) 'Underlay Cognitive Radio with Full or Partial Channel Quality Information'. International Journal of Navigation and Observation, 2010 Article number 105723
    doi: 10.1155/2020/105723
  • Dianati M, Tafazolli R, Shen XS, Naik K. (2010) 'Call admission control with opportunistic scheduling scheme'. JOHN WILEY & SONS INC WIRELESS COMMUNICATIONS & MOBILE COMPUTING, 10 (3), pp. 372-382.
    doi: 10.1002/wcm.771
    Full text is available at: http://epubs.surrey.ac.uk/712456/
  • Zhang Y, Ma Y, Tafazolli R. (2010) 'Power Allocation for Bidirectional AF Relaying over Rayleigh Fading Channels'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE COMMUNICATIONS LETTERS, 14 (2), pp. 145-147.
    doi: 10.1109/LCOMM.2010.02.092227
  • Dianati M, Tafazolli R, Shen X, Naik K. (2010) 'Per-user service model for opportunistic scheduling scheme over fading channels'. JOHN WILEY & SONS INC WIRELESS COMMUNICATIONS & MOBILE COMPUTING, 10 (1), pp. 87-100.
    doi: 10.1002/wcm.910
    Full text is available at: http://epubs.surrey.ac.uk/712455/
  • Movahhedian M, Ma Y, Tafazolli R. (2010) 'Blind CFO Estimation for Linearly Precoded OFDMA Uplink'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE TRANSACTIONS ON SIGNAL PROCESSING, 58 (9), pp. 4698-4710.
    doi: 10.1109/TSP.2010.2050063
  • Hoshyar R, Shariat M, Tafazolli R. (2010) 'Subcarrier and Power Allocation with Multiple Power Constraints in OFDMA Systems'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE COMMUNICATIONS LETTERS, 14 (7), pp. 644-646.
    doi: 10.1109/LCOMM.2010.07.100189
  • Bennis M, Wijting C, Abedi S, Thilakawardana S, Tafazolli R. (2009) 'Performance evaluation of advanced spectrum functionalities for future radio networks'. JOHN WILEY & SONS INC WIRELESS COMMUNICATIONS & MOBILE COMPUTING, 9 (11), pp. 1532-1542.
    doi: 10.1002/wcm.712
  • Heliot F, Chu X, Hoshyar R, Tafazolli R. (2009) 'A Tight Closed-Form Approximation of the Log-Normal Fading Channel Capacity'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, 8 (6), pp. 2842-2847.
    doi: 10.1109/TWC.2009.080972
    Full text is available at: http://epubs.surrey.ac.uk/2619/
  • Shariat M, Quddus AU, Ghorashi SA, Tafazolli R. (2009) 'Scheduling as an Important Cross-Layer Operation for Emerging Broadband Wireless Systems'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE COMMUNICATIONS SURVEYS AND TUTORIALS, 11 (2), pp. 74-86.
    doi: 10.1109/SURV.2009.090206
  • Bennis M, Kermoal J-P, Ojanen P, Lara J, Abedi S, Pintenet R, Thilakawardana S, Tafazolli R. (2009) 'Advanced Spectrum Functionalities for Future Radio Networks'. SPRINGER WIRELESS PERSONAL COMMUNICATIONS, 48 (1), pp. 175-191.
    doi: 10.1007/s11277-007-9423-8
  • Hanzo L, Tafazolli R. (2009) 'Admission Control Schemes for 802.11-Based Multi-Hop Mobile Ad hoc Networks: A Survey'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE COMMUNICATIONS SURVEYS AND TUTORIALS, 11 (4), pp. 78-108.
    doi: 10.1109/SURV.2009.090406
  • Abaii M, Liu Y, Tafazolli R. (2008) 'An efficient resource allocation strategy for future wireless cellular systems'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, 7 (8), pp. 2940-2949.
    doi: 10.1109/TWC.2008.060161
  • Thilakawardana D, Moessner K, Tafazolli R. (2008) 'Darwinian approach for dynamic spectrum allocation in next generation systems'. INST ENGINEERING TECHNOLOGY-IET IET COMMUNICATIONS, 2 (6), pp. 827-836.
    doi: 10.1049/iet-com:20070502
  • Ma Y, Yi N, Tafazolli R. (2008) 'Bit and power loading for OFDM-based three-node relaying communications'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE TRANSACTIONS ON SIGNAL PROCESSING, 56 (7), pp. 3236-3247.
    doi: 10.1109/TSP.2008.920493
    Full text is available at: http://epubs.surrey.ac.uk/1840/
  • Wang Y, Fan L, He D, Tafazolli R. (2008) 'Performance comparison of scheduling algorithms in network mobility environment'. ELSEVIER SCIENCE BV COMPUTER COMMUNICATIONS, 31 (9), pp. 1727-1738.
    doi: 10.1016/j.comcom.2007.11.017
  • Hoshyar R, Wathan PP, Tafazolli R. (2008) 'Novel low-density signature for synchronous CDMA systems over AWGN channel'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE TRANSACTIONS ON SIGNAL PROCESSING, 56 (4), pp. 1616-1626.
    doi: 10.1109/TSP.2007.909320
  • Wathan F, Hoshyar R, Tafazolli R. (2008) 'Dynamic grouped chip-level iterated multiuser detection based on Gaussian forcing technique'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE COMMUNICATIONS LETTERS, 12 (3), pp. 167-169.
    doi: 10.1109/LCOMM.2008.071931
    Full text is available at: http://epubs.surrey.ac.uk/1813/
  • Wang Y, Fan L, He D, Tafazolli R. (2008) 'Solution to weight-adaptive fair queuing'. INST ENGINEERING TECHNOLOGY-IET ELECTRON LETT, 44 (5), pp. 385-387.
    doi: 10.1049/el:20083333
  • Navaratnam P, Cruickshank H, Tafazolli R. (2008) 'A link adaptive transport protocol for multimedia streaming applications in multi hop wireless networks'. SPRINGER MOBILE NETWORKS & APPLICATIONS, 13 (3-4), pp. 246-258.
    doi: 10.1007/s11036-008-0057-1
  • Zhang Y, Hoshyar R, Tafazolli R. (2008) 'Timing and frequency offset estimation scheme for the uplink of OFDMA systems'. INST ENGINEERING TECHNOLOGY-IET IET COMMUNICATIONS, 2 (1), pp. 121-130.
    doi: 10.1049/ict-com:20060025
  • Huy DTP, Rodriguez J, Gameiro A, Tafazolli R. (2007) 'Dynamic resource allocation for beyond 3G cellular networks'. SPRINGER WIRELESS PERSONAL COMMUNICATIONS, 43 (4), pp. 1727-1740.
    doi: 10.1007/s11277-007-9339-3
  • Mozaffaripour M, Tafazolli R. (2007) 'Suboptimal search algorithm in conjunction with polynomial-expanded linear multiuser detector for FDD WCDMA mobile uplink'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, 56 (6), pp. 3600-3606.
    doi: 10.1109/FVT.2007.901064
  • Widiawan AK, Tafazolli R. (2007) 'High altitude platform station (HAPS): A review of new infrastructure development for future wireless communications'. SPRINGER WIRELESS PERSONAL COMMUNICATIONS, 42 (3), pp. 387-404.
    doi: 10.1007/s11277-006-9184-9
  • Li Z, Tafazolli R. (2007) 'Location management for packet switched services in 3G partnership project networks'. INST ENGINEERING TECHNOLOGY-IET IET COMMUNICATIONS, 1 (4), pp. 562-569.
    doi: 10.1049/iet-com:20060460
  • Gluhak A, Inoue M, Moessner K, Tafazolli R. (2007) 'Signaling channel for coordinated multicast service delivery in next generation wireless networks'. IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG IEICE TRANSACTIONS ON COMMUNICATIONS, E90B (7), pp. 1780-1790.
    doi: 10.1093/ietcom/e9O-b.7.1780
  • Ma Y, Tafazolli R. (2007) 'Estimation of carrier frequency offset for multicarrier CDMA uplink'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE TRANSACTIONS ON SIGNAL PROCESSING, 55 (6), pp. 2617-2627.
    doi: 10.1109/TSP.2006.890883
    Full text is available at: http://epubs.surrey.ac.uk/1844/
  • Ma Y, Tafazolli R. (2007) 'Channel estimation for OFDMA uplink: a hybrid of linear and BEM interpolation approach'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE TRANSACTIONS ON SIGNAL PROCESSING, 55 (4), pp. 1568-1573.
    doi: 10.1109/TSP.2006.887559
    Full text is available at: http://epubs.surrey.ac.uk/1835/
  • Dohler M, McLaughlin S, Lee Y, Tafazolli R. (2007) 'Implementable wireless access for B3G networks - Part IV: Resource management issues'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE COMMUNICATIONS MAGAZINE, 45 (3), pp. 106-111.
    doi: 10.1109/MCOM.2007.344590
    Full text is available at: http://epubs.surrey.ac.uk/2402/
  • Georgiades M, Akhtar N, Politis C, Tafazolli R. (2007) 'Enhancing mobility management protocols to minimise AAA impact on handoff performance'. ELSEVIER SCIENCE BV COMPUTER COMMUNICATIONS, 30 (3), pp. 608-618.
    doi: 10.1016/j.comcom.2005.11.021
  • Presser M, Brown T, Goulianos A, Stavrou S, Tafazolli R. (2007) 'Body centric context aware application scenarios'. IET Seminar Digest, 2007 (11803), pp. 19-25.
    doi: 10.1049/ic:20070540
  • Huang L, Liu Y, Thilakawardana S, Tafazolli R. (2006) 'Network-centric user assignment in the next generation mobile networks'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE COMMUNICATIONS LETTERS, 10 (12), pp. 822-824.
    doi: 10.1109/LCOMM.2006.061086
    Full text is available at: http://epubs.surrey.ac.uk/2077/
  • Rodriguez V, Moessner K, Tafazolli R. (2006) 'Market driven dynamic spectrum allocation over space and time among radio-access networks: DVB-T and B3G CDMA with heterogeneous terminals'. SPRINGER MOBILE NETWORKS & APPLICATIONS, 11 (6), pp. 847-860.
    doi: 10.1007/s11036-006-0053-2
  • Huang L, Chew KA, Thilakawardana S, Liu Y, Moessner K, Tafazolli R. (2006) 'Efficient group-based multimedia-on-demand service delivery in wireless networks'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE TRANSACTIONS ON BROADCASTING, 52 (4), pp. 492-504.
    doi: 10.1109/TBC.2006.883303
  • Rodriguez V, Moessner K, Tafazolli R. (2006) 'Market driven dynamic spectrum allocation over space and time among radio-access networks: DVB-T and B3G CDMA with heterogeneous terminals'. Multibody System Dynamics, 16 (4), pp. 847-860.
    doi: 10.1007/s11036-006-0053-2
  • Liu Y, Hoshyar R, Yang X, Tafazolli R. (2006) 'Integrated radio resource allocation for multihop cellular networks with fixed relay stations'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, 24 (11), pp. 2137-2146.
    doi: 10.1109/JSAC.2006.881603
    Full text is available at: http://epubs.surrey.ac.uk/1809/
  • Ma Y, Yi N, Tafazolli R. (2006) 'Channel estimation for PIRP-OFDM in slowly time-varying channel: First-order or second-order statistics?'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE SIGNAL PROCESSING LETTERS, 13 (3), pp. 129-132.
    doi: 10.1109/LSP.2005.862620
    Full text is available at: http://epubs.surrey.ac.uk/1828/
  • Hoshyar R, Wathan FP, Tafazolli R. (2006) 'Novel Low-Density Signature structure for synchronous DS-CDMA systems'. GLOBECOM - IEEE Global Telecommunications Conference,
    doi: 10.1109/GLOCOM.2006.67
    Full text is available at: http://epubs.surrey.ac.uk/2078/

    Abstract

    Novel Low-Density Signature (LDS) structure is proposed for synchronous Code Division Multiple Access (CDMA) systems for an uplink communication over AWGN channel. It arranges the system such that the interference pattern being seen by each user at each received sampled chip is different. Furthermore, new near-optimum chip-level iterative multiuser decoder is suggested to exploit the proposed structure. It is shown via computer simulations that, without forward error correction (FEC) coding, the proposed LDS structure could achieve near single-user performance with up to 200% loading condition. As the proposed iterative decoding converges relatively fast, the complexity is kept much more affordable than that of optimum multiuser detection (MUD) with conventional structure. © 2006 IEEE.

  • Georgiades M, Tafazolli R, Dagiuklas T. (2006) 'Middlebox context transfer for multimedia session support in all-IP networks'. IWCMC 2006 - Proceedings of the 2006 International Wireless Communications and Mobile Computing Conference, 2006, pp. 389-394.
    doi: 10.1145/1143549.1143627
  • Prammanee S, Moessner K, Tafazolli R. (2006) 'Discovering modalities for adaptive multimodal interfaces'. Interactions, 13 (3), pp. 66-70.

Conference papers

  • Akbari A, Imran MA, Tafazolli R. (2011) 'Maximising Average Energy efficiency for Two-user AWGN Broadcast Channel'. Warsaw, Poland : IEEE Future Network and Mobile Summit, Warsaw: Future Network & Mobile Summit (FutureNetw), 2011
    Full text is available at: http://epubs.surrey.ac.uk/533674/

    Abstract

    Energy consumption has become an increasingly important aspect of wireless communications, from both an economical and environmental point of view. New enhancements are being placed on mobile networks to reduce the power consumption of both mobile terminals and base stations. This paper studies the achievable rate region of AWGN broadcast channels under Time-division, Frequency-division and Superposition coding, and locates the optimal energy-efficient rate-pair according to a comparison metric based on the average energy efficiency of the system. In addition to the transmit power, circuit power and signalling power are also incorporated in the energy efficiency function, with simulation results verifying that the Superposition coding scheme achieves the highest energy efficiency in an ideal, but non-realistic scenario, where the signalling power is zero. With moderate signalling power, the Frequency-division scheme is the most energy-efficient, with Superposition coding and Time-division becoming second and third best. Conversely, when the signalling power is high, both Time-division and Frequency-division schemes outperform Superposition coding. On the other hand, the Superposition coding scheme also incorporates rate-fairness into the system, which allows both users to transmit whilst maximising the energy efficiency.

  • Yi N, Ma Y, Tafazolli R. (2011) 'Incremental Decode-Forward Relaying over Asymmetric Fading Channels: Outage Probability and Location-Aided Relay Selection'. Nice, France: IEEE SSP'11, pp. 181-184.
    doi: 10.1109/SSP.2011.5967653
  • Heliot F, Imran MA, tafazolli R. (2011) 'On the Energy Efficiency Gain of MIMO Communication under Various Power Consumption Models'. Warsaw, Poland: ICT Future Network & Mobile Summit
  • Yi N, Ma Y, Tafazolli R. (2011) 'Cooperative iterative water-filling for two-user Gaussian frequency-selective interference chanels'. Budapest: IEEE VTC'11
    doi: 10.1109/VETECS.2011.5956423
  • Hoseinitabatabaei SA, Gluhak A, Tafazolli R. (2011) 'uDirect: A novel approach for pervasive observation of user direction with mobile phones'. 2011 IEEE International Conference on Pervasive Computing and Communications, PerCom 2011, , pp. 74-83.
    doi: 10.1109/PERCOM.2011.5767597
  • Lu Z, Ma Y, Tafazolli R. (2010) 'A first-order cyclostationarity based energy detection approach for non-cooperative spectrum sensing'. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, , pp. 554-559.
    doi: 10.1109/PIMRC.2010.5671870
    Full text is available at: http://epubs.surrey.ac.uk/737043/

    Abstract

    Spectrum sensing is one of key enabling techniques to advanced radio technologies such as cognitive radios and ALOHA. This paper presents a novel non-cooperative spectrum sensing approach that can achieve a good trade-off between latency, reliability and computational complexity. Our major idea is to exploit the first-order cyclostationarity of the primary user's signal to reduce the noise-uncertainty problem inherent in the conventional energy detection approach. It is shown that the proposed approach is suitable for detecting the primary user's activity in the interweave paradigm of cognitive spectrum sharing, while the active primary user is periodically sending training sequence. Computer simulations are carried out for the typical IEEE 802.11g system. It is observed that the proposed approach outperforms both the energy detection and the second-order cyclostationarity approach when the observation period is more than 10 frames corresponding to 0.56 ms. ©2010 IEEE.

  • Han C, Dianati M, Tafazolli R, Kernchen R. (2010) 'Throughput Analysis of the IEEE 802.11p Enhanced Distributed Channel Access Function in Vehicular Environment'. Ottowa, Canada: 72nd IEEE Vehicular Technology Conference, pp. 1-5.
    doi: 10.1109/VETECF.2010.5594411
  • Mach T, Tafazolli R. (2010) 'Battery life idle parameter optimization of UE in self organizing network'. IEEE 21st International Symposium on Personal, Indoor and Mobile Radio Communications, Instanbul, Turkey: 21st PIMRC 2010, pp. 1332-1336.
    doi: 10.1109/PIMRC.2010.5672013
  • Imran A, Imran MA, Tafazolli R. (2010) 'A novel self organizing framework for adaptive frequency reuse and deployment in future cellular networks'. 21st IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Instanbul, Turkey: 21st PIMRC 2009, pp. 2354-2359.
    doi: 10.1109/PIMRC.2010.5671710
  • Héliot F, Hoshyar R, Tafazolli R. (2010) 'Power Allocation for the Downlink of Nonregenerative Cooperative Multi-User MIMO Communication system'. Proc. IEEE PIMRC, Istanbul, Turkey: IEEE PIMRC
    Full text is available at: http://epubs.surrey.ac.uk/2667/
  • Héliot F, Hoshyar R, Tafazolli R. (2010) 'On the spectral efficiency maximization of Nonregenerative Cooperative MIMO Communication Systems'. Proc. IEEE PIMRC, Istanbul, Turkey: IEEE PIMRC
    Full text is available at: http://epubs.surrey.ac.uk/2666/
  • Wei D, Navaratnam P, Gluhak A, Tafazolli R. (2010) 'Energy-efficient Clustering for Wireless Sensor Networks with Unbalanced Traffic Load'. IEEE IEEE Wireless Communications and Networking conference, Sydney: IEEE Wireless Communications & Networking Conference
    doi: 10.1109/WCNC.2010.5506172
  • Héliot F, Hoshyar R, Tafazolli R. (2010) 'Low-Complexity Power Allocation Schemes for the Downlink of Nonregenerative Cooperative Multi-User MIMO Communication System'. Proc. ICT Future Network & Mobile Summit, Florence, Italy: ICT Future Network & Mobile Summit
    Full text is available at: http://epubs.surrey.ac.uk/2662/
  • Abangar H, Ghader M, Gluhak A, Tafazolli R. (2010) 'Improving the Performance of Web Services in Wireless Sensor Networks'. Florence, Italy: Future Network & Mobile Summit 2010
  • Héliot F, Hoshyar R, Tafazolli R. (2010) 'Weighted Sum-Rate based Power Allocation for the Uplink of Nonregenerative Cooperative Multi-User MIMO Communication System'. Proc. ICT Future Network & Mobile Summit, Florence, Italy: ICT Future Network & Mobile Summit
    Full text is available at: http://epubs.surrey.ac.uk/2661/
  • Fazel Falavarjani MS, Hoshyar R, Tafazolli R. (2010) 'Performance evaluation of a flexible amplify and forward (AF) combined with HARQ'. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, , pp. 488-493.
    doi: 10.1109/PIMRC.2010.5671902
  • Imran A, Imran MA, Tafazolli R. (2010) 'A new performance characterization framework for deployment architectures of next generation distributed cellular networks'. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, , pp. 2046-2051.
    doi: 10.1109/PIMRC.2010.5671581
  • Chatzimisios P, Dagiuklas T, Tafazolli R, Verikoukis C. (2010) 'Message from ConWire'10 co-chairs'. Proceedings - International Conference on Computer Communications and Networks, ICCCN,
    doi: 10.1109/ICCCN.2010.5560032
  • Auer G, Godor I, Hevizi L, Imran M, Tafazolli R. (2010) 'Enablers for Energy Efficient Wireless Networks'. Ottawa, Canada : Green Wireless Communications and Networks Workshop � GreeNet, Proc. IEEE VTC Fall 2010,
  • Guo T, Wang N, Tafazolli R, Moessner K. (2010) 'Policy-Aware Virtual relay placement for inter-domain path diversity'. Proc. IEEE Symp. Computers and Communications (ISCC), , pp. 38-43.
    doi: 10.1109/ISCC.2010.5546774
  • Georgoulas S, Moessner K, Mcaleer B, Tafazolli R. (2010) 'Using Formal Verification Methods and Tools for Protocol Profiling and Performance Assessment in Mobile and Wireless Environments'. IEEE 2010 IEEE 21st International Symposium on Personal Indoor and Mobile Radio Communications, Istanbul, Turkey: PIMRC 2010, pp. 2471-2476.
    doi: 10.1109/PIMRC.2010.5671736
  • Mostafavi SM, Hamadani E, Tafazolli R. (2010) 'Delay minimization in multipath routing'. IWCMC 2010 - Proceedings of the 6th International Wireless Communications and Mobile Computing Conference, , pp. 711-715.
    doi: 10.1145/1815396.1815560
  • Qi Y, Hoshyar R, Tafazolli R. (2010) 'A novel hybrid relaying scheme using multilevel coding'. IEEE Vehicular Technology Conference,
    doi: 10.1109/VETECS.2010.5494062
  • Qi Y, Hoshyar R, Tafazolli R. (2010) 'The error-resilient compression of correlated binary sources and EXIT chart based performance evaluation'. Proceedings of the 2010 7th International Symposium on Wireless Communication Systems, ISWCS'10, , pp. 741-745.
    doi: 10.1109/ISWCS.2010.5624327
  • Georgoulas S, Moessner K, McAleer B, Tafazolli R. (2010) 'Towards efficient protocol design through protocol profiling and verification of performance and operational metrics'. IWCMC 2010 - Proceedings of the 6th International Wireless Communications and Mobile Computing Conference, , pp. 848-852.
    doi: 10.1145/1815396.1815591
  • Wei D, Jin Y, Gluhak A, Tafazolli R, Moessner K. (2010) 'Hot-spot issue aware clustering for WSNs to extend stable operation period'. 2010 Future Network and Mobile Summit,
  • Qi Y, Hoshyar R, Tafazolli R. (2010) 'A novel decoding structure in compress-and-forward systems'. IWCMC 2010 - Proceedings of the 6th International Wireless Communications and Mobile Computing Conference, , pp. 412-416.
    doi: 10.1145/1815396.1815492
  • Rodriguez J, Marques P, Radwan A, Moessner K, Tafazolli R, Raspopoulos M, Stavrou S, Trapps P, Noquet D, Sithamparanathan K, Gomes Á, Piesiewicz R, Mokrani H, Foglar A, Verikoukis C. (2010) 'Cognitive radio and cooperative strategies for power saving in multi-standard wireless devices'. 2010 Future Network and Mobile Summit,
  • Zhang Y, Ma Y, Tafazolli R. (2010) 'Modulation-adaptive cooperation in Rayleigh fading channels with imperfect CSI'. IWCMC 2010 - Proceedings of the 6th International Wireless Communications and Mobile Computing Conference, , pp. 148-152.
    doi: 10.1145/1815396.1815431
  • Akbari A, Hoshyar R, Tafazolli R. (2010) 'Energy-efficient resource allocation in wireless OFDMA systems'. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, , pp. 1731-1735.
    doi: 10.1109/PIMRC.2010.5671913
  • Dianati M, Tafazolli R, Moessner K, Zseby T, Savola R, Pistore M. (2010) 'Enabling Tussle-Agile Inter-networking Architectures by Underlay Virtualisation'. SPRINGER-VERLAG BERLIN FUTURE INTERNET - FIS 2009, Berlin, GERMANY: 2nd Future Internet Symposium (FIS 2009) 6152, pp. 81-95.
  • Kosta C, Sodunke T, Shateri M, Tafazolli R. (2010) 'Two-stage call admission control policy for LTE Systems'. IWCMC 2010 - Proceedings of the 6th International Wireless Communications and Mobile Computing Conference, , pp. 1101-1105.
    doi: 10.1145/1815396.1815648
  • Qi Y, Imran M, Tafazolli R. (2010) 'On the energy aware deployment strategy in cellular systems'. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, , pp. 363-367.
    doi: 10.1109/PIMRCW.2010.5670395
  • He Z, Ma Y, Tafazolli R, Liu H. (2010) 'An oversampling approach for LoS-ToA estimation in interleaved OFDMA'. IWCMC 2010 - Proceedings of the 6th International Wireless Communications and Mobile Computing Conference, , pp. 580-584.
    doi: 10.1145/1815396.1815530
  • Salami G, Tafazolli R. (2009) 'A two stage genetically inspired algorithm for spectrum sharing between two UMTS operators'. International Conference on Ultra Modern Telecommunications & Workshops, St. Petersburg, Russia: ICUMT '09
    doi: 10.1109/ICUMT.2009.5345546
  • Salami GK, Tafazolli R. (2009) 'A framework for UMTS inter-operator spectrum sharing in the UMTS extension band'. IEEE 9th International Symposium on Communications and Information Technology, Icheon, South Korea: 9th ISCIT 2009, pp. 193-198.
    doi: 10.1109/ISCIT.2009.5341259
  • Yi N, Ma Y, Tafazolli R. (2009) 'Coexistence Strategies and Capacity Theorems of Interference Awareness Cognitive Radio'. IEEE 2009 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATION WORKSHOPS, VOLS 1 AND 2, Dresden, GERMANY: IEEE International Conference on Communications (ICC 2009), pp. 644-648.
    Full text is available at: http://epubs.surrey.ac.uk/737052/
  • Heliot F, Hoshyar R, Tafazolli R. (2009) 'A CLOSED-FORM APPROXIMATION OF THE OUTAGE PROBABILITY FOR DISTRIBUTED MIMO SYSTEMS'. IEEE SPAWC: 2009 IEEE 10TH WORKSHOP ON SIGNAL PROCESSING ADVANCES IN WIRELESS COMMUNICATIONS, Perugia, ITALY: 10th IEEE Workshop on Signal Processing Advances in Wireless Communications, pp. 529-533.
    Full text is available at: http://epubs.surrey.ac.uk/2623/
  • Heliot F, Fazel S, Hoshyar R, Tafazolli R. (2009) 'RECEIVE KNOWLEDGE ONLY POWER ALLOCATION FOR NONREGENERATIVE COOPERATIVE MIMO COMMUNICATION'. IEEE SPAWC: 2009 IEEE 10TH WORKSHOP ON SIGNAL PROCESSING ADVANCES IN WIRELESS COMMUNICATIONS, Perugia, ITALY: 10th IEEE Workshop on Signal Processing Advances in Wireless Communications, pp. 524-528.
    Full text is available at: http://epubs.surrey.ac.uk/2624/
  • Ghader M, Tafazolli R. (2009) 'Efficient Employment of Service Location Protocol in Multi-cluster Networks'. Santander, Spain: ICT-MobileSummit 2009
  • Qi YA, Hoshyar R, Tafazolli R. (2009) 'A Novel Quantization Scheme in Compress-and-Forward Relay System'. IEEE IEEE 69th VEHICULAR TECHNOLOGY CONFERENCE, Barcelona, SPAIN: 69th VTC Spring 2009, pp. 1854-1858.
    doi: 10.1109/VETECS.2009.5073322
  • Hoshyar R, Heliot F, Tafazolli R. (2009) 'A Novel Multi-layer Cooperative Decode and Forward Scheme'. IEEE 2009 IEEE VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-5, Barcelona, SPAIN: 69th IEEE Vehicular Technology Conference, pp. 1248-+.
    Full text is available at: http://epubs.surrey.ac.uk/2625/
  • Qi YA, Hoshyar R, Tafazolli R. (2009) 'A New ARQ Protocol for Hybrid DF/CF Relay Scheme'. IEEE 69th IEEE VEHICULAR TECHNOLOGY CONFERENCE, Barcelona, SPAIN: 69th VTC Spring 2009, pp. 1356-1360.
    doi: 10.1109/VETECS.2009.5073309
  • Imran A, Shateri M, Tafazolli R, Boukerche A, Lassous G, Olariu S. (2009) 'On the Comparison of Performance, Capacity and Economics of Terrestrial Base Station and High Altitude Platform Based Deployment of 4G'. ASSOC COMPUTING MACHINERY PE-WASUN09: PROCEEDINGS OF THE SIXTH ACM INTERNATIONAL SYMPOSIUM ON PERFORMANCE EVALUATION OF WIRELESS AD-HOC, SENSOR, AND UBIQUITOUS NETWORKS, Tenerife, SPAIN: 6th ACM International Symposium on Performance Evaluation of Wireless Ad-Hoc, Sensor, and Ubiquitous Networks, pp. 58-62.
    doi: 10.1145/1641876.1641887
  • Qi Y, Hoshyar R, Tafazolli R. (2009) 'Efficient ARQ Protocol for Hybrid Relay Schemes with Limited Feedback'. IEEE 2009 IEEE VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-5, Barcelona, SPAIN: 69th IEEE Vehicular Technology Conference, pp. 1849-1853.
  • Qi Y, Hoshyar R, Tafazolli R. (2009) 'On the Performance of HARQ with Hybrid Relaying Schemes'. IEEE 2009 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, VOLS 1-8, Dresden, GERMANY: IEEE International Conference on Communications (ICC 2009), pp. 4357-4362.
  • Fazel MS, Hoshyar R, Tafazolli R. (2009) 'Flexible Amplify and Forward Relaying Protocol with optimized duplexing'. IEEE 2009 IEEE VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-5, Barcelona, SPAIN: 69th IEEE Vehicular Technology Conference, pp. 3176-3180.
  • Yarmohammad A, Tafazolli R. (2009) 'Decentralized inter-radio access network dynamic spectrum selection scheme'. 2009 International Conference on Wireless Communications and Signal Processing, WCSP 2009,
    doi: 10.1109/WCSP.2009.5371601
  • Salami G, Thilakawardana S, Tafazolli R. (2009) 'The impact of queuing and call setup delays on UMTS spectrum sharing algorithm'. IEEE WTS: 2009 WIRELESS TELECOMMUNICATIONS SYMPOSIUM, Prague, CZECH REPUBLIC: Wireless Telecommunications Symposium 2009, pp. 402-406.
  • Hoshyar R, Tafazolli R. (2009) 'A Pre-BSC Model for Distributed Turbo Codes'. IEEE 2009 IEEE VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-5, Barcelona, SPAIN: 69th IEEE Vehicular Technology Conference, pp. 1936-1940.
  • Salami G, Thilakawardana S, Tafazolli R. (2009) 'Dynamic spectrum sharing algorithm between two UMTS operators in the UMTS Extension Band'. IEEE 2009 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATION WORKSHOPS, VOLS 1 AND 2, Dresden, GERMANY: IEEE International Conference on Communications (ICC 2009), pp. 338-343.
  • Psaras I, Dianati M, Tafazolli R, Fratta L, Schulzrinne H, Takahashi Y, Spaniol O. (2009) 'Why Rely on Blind AIMDs? (Work in Progress)'. SPRINGER-VERLAG BERLIN NETWORKING 2009, Aachen, GERMANY: 8th International IFIP TC 6 Network Conference 2009 5550, pp. 404-415.
    Full text is available at: http://epubs.surrey.ac.uk/734366/
  • Hoshyar R, Tafazolli R. (2009) 'Optimum Decoding of Full Decode and Forward Scheme over Cooperative Relay Channels'. IEEE 2009 IEEE VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-5, Barcelona, SPAIN: 69th IEEE Vehicular Technology Conference, pp. 1054-1058.
  • Imran A, Tafazolli R. (2009) 'Evaluation and Comparison of Capacities and Costs of Multihop Cellular Networks'. IEEE 2009 INTERNATIONAL CONFERENCE ON TELECOMMUNICATIONS (ICT), Marrakech, MOROCCO: 16th International Conference on Telecommunications (ICT), pp. 160-165.
    doi: 10.1109/ICTEL.2009.5158637
  • Salami G, Tafazolli R. (2009) 'On the Performance evaluation of spectrum sharing algorithms between two UMTS operators'. IEEE 2009 INTERNATIONAL CONFERENCE ON TELECOMMUNICATIONS (ICT), Marrakech, MOROCCO: 16th International Conference on Telecommunications (ICT), pp. 260-265.
    doi: 10.1109/ICTEL.2009.5158655
  • Salami G, Tafazolli R, Zarko IP, Vrdoljak B. (2009) 'On the Impact of Varying Bandwidth on the Performance of UMTS Spectrum Sharing Algorithm'. UNIV ZAGREB, FAC ELECT ENGN COMP CONTEL 2009: PROCEEDINGS OF THE 10TH INTERNATIONAL CONFERENCE ON TELECOMMUNICATIONS, Univ Zagreb, Fac Elect Engn & Comp, Zagreb, CROATIA: 10th International Conference on Telecommunications (ConTEL 2009), pp. 319-324.
  • Mach T, Tafazolli R. (2009) 'Mass Mobility Signaling Congestion Avoidance Mechanism Using Randomized Time Distribution of Cell Reselections'. IEEE 2009 INTERNATIONAL CONFERENCE ON TELECOMMUNICATIONS (ICT), Marrakech, MOROCCO: 16th International Conference on Telecommunications (ICT), pp. 238-242.
    doi: 10.1109/ICTEL.2009.5158651
  • Shariat M, Quddus AU, Tafazolli R. (2009) 'Distance-incorporated opportunistic scheduling'. Proceedings of the 2009 ACM International Wireless Communications and Mobile Computing Conference, IWCMC 2009, , pp. 675-680.
    doi: 10.1145/1582379.1582526
  • Liu H, Ma Y, Tafazolli R. (2009) 'Enhanced linear interpolation schemes for chunk-based OFDMA uplink'. IEEE Vehicular Technology Conference,
    doi: 10.1109/VETECS.2009.5073534
  • Hoshyar R, Tafazolli R. (2009) 'Performance evaluation Of HARQ schemes for Cooperative Regenerative Relaying'. IEEE 2009 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, VOLS 1-8, Dresden, GERMANY: IEEE International Conference on Communications (ICC 2009), pp. 3355-3360.
  • Quddus AU, Evans BG, Tafazolli R. (2009) 'Blind adaptive multiuser detection for code division multiple access using Cimmino's reflection method'. Proceedings of 6th International Bhurban Conference on Applied Sciences and Technology, IBCAST-2009, 2, pp. 118-120.
  • Qi Y, Hoshyar R, Tafazolli R. (2009) 'Efficient hybrid relaying schemes with limited feedback'. Proceedings of the 2009 ACM International Wireless Communications and Mobile Computing Conference, IWCMC 2009, , pp. 754-758.
    doi: 10.1145/1582379.1582543
  • Hamadani E, Mostafavi M, Tafazolli R, Rakocevic V. (2009) 'Analysis of IEEE802.11 DCF Parameters on Achievable Throughput in Ad hoc Networks'. IEEE 2009 IEEE 70TH VEHICULAR TECHNOLOGY CONFERENCE FALL, VOLS 1-4, Anchorage, AK: 70th IEEE Vehicular Technology Conference, pp. 465-470.
  • Dianati M, Tafazolli R, Shen X, Naik K. (2009) 'A markov model for per-user service of opportunistic scheduling'. Proceedings of the 2009 ACM International Wireless Communications and Mobile Computing Conference, IWCMC 2009, , pp. 681-686.
    doi: 10.1145/1582379.1582527
  • Yarmohammad A, Abaii M, Thilakawardana S, Tafazolli R. (2009) 'Inter-operator Dynamic Spectrum Selection in UMTS'. IEEE 2009 IEEE VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-5, Barcelona, SPAIN: 69th IEEE Vehicular Technology Conference, pp. 504-508.
  • Shariat M, Ul Quddus A, Tafazolli R. (2009) 'Joint opportunistic scheduling and spectrum sharing'. IEEE Wireless Communications and Networking Conference, WCNC,
    doi: 10.1109/WCNC.2009.4917772
  • Imran A, Tafazolli R. (2009) 'Performance & capacity of mobile broadband WiMax (802.16e) deployed via high altitude platform'. 2009 European Wireless Conference, EW 2009, , pp. 319-323.
    doi: 10.1109/EW.2009.5357976
  • Touheed H, Quddus AU, Tafazolli R. (2009) 'Impact of MMSE equalization on adaptive modulation and coding in HSDPA'. Proceedings of 6th International Bhurban Conference on Applied Sciences and Technology, IBCAST-2009, 2, pp. 127-131.
  • Yi N, Ma Y, Tafazolli R. (2008) 'Bit and power loading for OFDM with an amplify-and-forward cooperative relay'. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC,
    doi: 10.1109/PIMRC.2008.4699397
    Full text is available at: http://epubs.surrey.ac.uk/737050/

    Abstract

    In this paper, we propose a rate-adaptive bit and power loading approach for the OFDM-based relaying communications. The cooperative relay operates in the half-duplex amplify-and-forward mode. The source and the relay has the separate power constraints. The maximum-ratio combining is employed at -the destination for maximizing the received SNR. Assuming the perfect channel knowledge available at all nodes, the proposed approach is to maximize the throughput (the number of bits/symbol) at the given power constraint and the target link performance. Unlike the water-filling method, the proposed approach does not need the iterative loading process, and can otTer the sub-optimum performance. Computer simulations are used to test the proposed approach for various scenarios with respect to the relay location or the distributed power allocation. © 2008 IEEE.

  • Mirzadeh S, Cruickshank H, Tafazolli R. (2008) 'An efficient key management solution for personal network federations'. Proceedings - The 2nd International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies, UBICOMM 2008, , pp. 401-406.
    doi: 10.1109/UBICOMM.2008.15
    Full text is available at: http://epubs.surrey.ac.uk/2280/

    Abstract

    Personal Network Federation (PN-F) aims to provide secure interactions between a subset of devices of different Personal Networks (PN) for achieving a common goal or providing some services in collaborative environments. Security and privacy is one of the major concerns in the development and acceptance of PN-F like collaborative networks and as any other security architecture, the key management is the corner stone of any possible solution. In this paper, we provide security mechanisms and protocols for key exchange and key management in PN Federations and specify how the established keys can be used to secure communications in different layers. © 2008 IEEE.

  • Héliot F, Hoshyar R, Tafazolli R, Chut X. (2008) 'An accurate closed-form approximation of the ergodic capacity over log-normal fading channels'. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC,
    doi: 10.1109/PIMRC.2008.4699410
    Full text is available at: http://epubs.surrey.ac.uk/2628/

    Abstract

    The log-normal probability distribution is commonly used in wireless communications to model the shadowing and, more recently, the small-scale fading for indoor ultra-wide-band communications. In this paper, an accurate closed-form approximation of the ergodic capacity over log-normal fading channels is derived. This expression can be easily used to evaluate and compare the ergodic capacity of communication systems operating over log-normal fading channels. © 2008 IEEE.

  • Mirzadeh S, Tafazolli R, Armknecht F, Pallares JJ, Afifi H. (2008) 'CPFP: An efficient key management scheme for large scale personal networks'. IEEE 2008 3RD INTERNATIONAL SYMPOSIUM ON WIRELESS PERVASIVE COMPUTING, VOLS 1-2, Santorini, GREECE: 3rd International Symposium on Wireless Pervasive Computing, pp. 743-747.
  • Yi N, Ma Y, Tafazolli R. (2008) 'Multi-tone transmissions over two-user cognitive radio channel with weak interference'. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC,
    doi: 10.1109/PIMRC.2008.4699883
  • Mirzadeh S, Tafazolli R, Pallares JJ, Armknecht F, Afifi H. (2008) 'CPFP: An efficient key management scheme for large scale personal networks'. 3rd International Symposium on Wireless Pervasive Computing, ISWPC 2008, Proceedings, , pp. 744-748.
    doi: 10.1109/ISWPC.2008.4556309
    Full text is available at: http://epubs.surrey.ac.uk/2330/

    Abstract

    This paper provides an efficient key management scheme for large scale personal networks (PN) and introduces the Certified PN Formation Protocol (CPFP) based on a personal public key infrastructure (personal PKI) concept and Elliptic Curve Cryptography (ECC) techniques. © 2008 IEEE.

  • Wathan FP, Hoshyar R, Tafazolli R. (2008) 'PERFORMANCE ANALYSIS OF GROUPED CHIP-LEVEL ITERATED MULTIUSER DETECTION FOR OVERLOADED CDMA SYSTEMS'. IEEE 2008 IEEE 9TH WORKSHOP ON SIGNAL PROCESSING ADVANCES IN WIRELESS COMMUNICATIONS, VOLS 1 AND 2, Recife, BRAZIL: 9th IEEE Workshop on Signal Processing Advances in Wireless Communications, pp. 131-135.
    doi: 10.1109/SPAWC.2008.4641584
  • Wang M, Georgiades M, Tafazolli R. (2008) 'Signalling cost evaluation of mobility management schemes for different core network architectural arrangements in 3GPP LTE/SAE'. IEEE 2008 IEEE 67TH VEHICULAR TECHNOLOGY CONFERENCE-SPRING, VOLS 1-7, Marina Bay, SINGAPORE: 67th IEEE Vehicular Technology Conference, pp. 2253-2258.
  • Hanzo L, Mostafavi SM, Tafazolli R. (2008) 'Connectivity-related properties of mobile nodes obeying the random walk and random waypoint mobility models'. IEEE 2008 IEEE 67TH VEHICULAR TECHNOLOGY CONFERENCE-SPRING, VOLS 1-7, Marina Bay, SINGAPORE: 67th IEEE Vehicular Technology Conference, pp. 133-137.
    Full text is available at: http://epubs.surrey.ac.uk/2321/
  • Qi Y, Hoshyar R, Tafazolli R. (2008) 'Performance evaluation of soft decode-and-forward in fading relay channels'. IEEE 2008 IEEE 67TH VEHICULAR TECHNOLOGY CONFERENCE-SPRING, VOLS 1-7, Marina Bay, SINGAPORE: 67th IEEE Vehicular Technology Conference, pp. 1286-1290.
  • Quddus AU, Yang X, Tafazolli R. (2008) 'Link-level analysis of downlink handover regions in UMTS'. IEEE 2008 IEEE 67TH VEHICULAR TECHNOLOGY CONFERENCE-SPRING, VOLS 1-7, Marina Bay, SINGAPORE: 67th IEEE Vehicular Technology Conference, pp. 2527-2531.
  • Qi Y, Hoshyar R, Tafazolli R. (2008) 'Soft multilevel Slepian-Wolf decoding in systems using Turbo joint decoding and decompressing'. IEEE 2008 IEEE 67TH VEHICULAR TECHNOLOGY CONFERENCE-SPRING, VOLS 1-7, Marina Bay, SINGAPORE: 67th IEEE Vehicular Technology Conference, pp. 1514-1518.
  • Hamid A, Hoshyar R, Tafazolli R. (2008) 'Joint rate and power adaptation for MC-CDMA over tempo-spectral domain'. IEEE WCNC 2008: IEEE WIRELESS COMMUNICATIONS & NETWORKING CONFERENCE, VOLS 1-7, Las Vegas, NV: IEEE Wireless Communications and Networking Conference, pp. 969-973.
    Full text is available at: http://epubs.surrey.ac.uk/1842/
  • Dianati M, Tafazolli R. (2008) 'Opportunistic scheduling over wireless fading channels without explicit feedback'. IEEE 2008 IEEE 67TH VEHICULAR TECHNOLOGY CONFERENCE-SPRING, VOLS 1-7, Marina Bay, SINGAPORE: 67th IEEE Vehicular Technology Conference, pp. 1871-1875.
  • Sand S, Mensing C, Ma Y, Tafazolli R, Yin X, Figueiras J, Nielsen J, Fleury BH. (2008) 'Hybrid data fusion and cooperative schemes for wireless positioning'. IEEE Vehicular Technology Conference,
    doi: 10.1109/VETECF.2008.435
  • Movahedian M, Ma Y, Tafazolli R. (2008) 'An MUI resilient approach for blind CFO estimation in OFDMA uplink'. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC,
    doi: 10.1109/PIMRC.2008.4699693
  • Zhang Y, Ma Y, Tafazolli R. (2008) 'Modulation-adaptive cooperation schemes for wireless networks'. IEEE 2008 IEEE 67TH VEHICULAR TECHNOLOGY CONFERENCE-SPRING, VOLS 1-7, Marina Bay, SINGAPORE: 67th IEEE Vehicular Technology Conference, pp. 1320-1324.
    Full text is available at: http://epubs.surrey.ac.uk/2423/
  • Movahedian M, Ma Y, Tafazolli R. (2008) 'Iterative carrier frequency offset estimation and compensation for OFDMA uplink'. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC,
    doi: 10.1109/PIMRC.2008.4699695
  • Liu H, Ma Y, Tafazolli R. (2008) 'On efficiency gain of joint pilot and data adaptation for OFDM based systems'. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC,
    doi: 10.1109/PIMRC.2008.4699854
  • Shariat M, Quddus AU, Tafazolli R. (2008) 'On the efficiency of interference coordination schemes in emerging cellular wireless networks'. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC,
    doi: 10.1109/PIMRC.2008.4699874
    Full text is available at: http://epubs.surrey.ac.uk/2438/

    Abstract

    In this paper, the efficiencies of different interference coordination schemes are evaluated for emerging wireless networks and the possible impact on intra-cell scheduling is studied through extensive simulations. The results show that pure fractional frequency reuse can provide similar improvement in the cell-edge throughput compared to power coordinated counterpart at a less cost in terms of overall throughput. Moreover, it can provide fairer distribution of throughput in both central as well as cell-edge areas. However, this scheme can not mange asymmetrical changes in the distribution of users across different cells in the entire system. As a result, a power coordination mechanism would be still necessary on top of such flexible frequency reuse schemes. © 2008 IEEE.

  • Hoshyar R, Tafazolli R. (2008) 'Soft decode and forward of MQAM modulations for cooperative relay channels'. IEEE 2008 IEEE 67TH VEHICULAR TECHNOLOGY CONFERENCE-SPRING, VOLS 1-7, Marina Bay, SINGAPORE: 67th IEEE Vehicular Technology Conference, pp. 639-643.
  • Yi N, Ma Y, Tafazolli R. (2008) 'Rate-adaptive bit and power loading for OFDM based DF relaying'. IEEE 2008 IEEE 67TH VEHICULAR TECHNOLOGY CONFERENCE-SPRING, VOLS 1-7, Marina Bay, SINGAPORE: 67th IEEE Vehicular Technology Conference, pp. 1340-1344.
  • Touheed H, Quddus AU, Tafazolli R. (2008) 'Predictive CQI reporting for HSDPA'. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC,
    doi: 10.1109/PIMRC.2008.4699546
  • Jung J, Abaii M, Tafazolli R. (2008) 'Load Matrix optimization in mobile cellular networks'. IEEE 2008 IEEE 67TH VEHICULAR TECHNOLOGY CONFERENCE-SPRING, VOLS 1-7, Marina Bay, SINGAPORE: 67th IEEE Vehicular Technology Conference, pp. 2016-2020.
    Full text is available at: http://epubs.surrey.ac.uk/2415/
  • Touheed H, Quddus AU, Tafazolli R. (2008) 'An improved link adaptation scheme for High Speed Downlink Packet Access'. IEEE 2008 IEEE 67TH VEHICULAR TECHNOLOGY CONFERENCE-SPRING, VOLS 1-7, Marina Bay, SINGAPORE: 67th IEEE Vehicular Technology Conference, pp. 2051-2055.
    Full text is available at: http://epubs.surrey.ac.uk/2060/
  • Hoshyar R, Tafazolli R. (2008) 'BER performance analysis of a cooperative BICM system based on post-BSC model'. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC,
    doi: 10.1109/PIMRC.2008.4699625
  • Salami G, Quddus AU, Thilakawardana D, Tafazolli R. (2008) 'Nonpool based spectrum sharing for two UMTS operators in the UMTS extension band'. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC,
    doi: 10.1109/PIMRC.2008.4699855
    Full text is available at: http://epubs.surrey.ac.uk/2435/

    Abstract

    This paper investigates spectrum sharing (in the form of code sharing) between two Universal Mobile Telecommunication System (UMTS) operators in the UMTS extension band (2500-2690MHz) with equal and unequal number of proprietary carriers, respectively. The paper proposes a Dynamic Spectrum Allocation (DSA) algorithm to address the problem of spectrum sharing between two operators on a non-pool basis. It also investigates the impact of Adjacent Channel Interference (ACI) on the spectrum sharing gain. Additionally, an architecture that enables spectrum sharing to take place between two or more UMTS operators is presented. The simulated performance of the proposed DSA algorithm shows that under peak-hour loading, up to 32% increase in capacity can be obtained when compared to currently used Fixed Spectrum Allocation (FSA). © 2008 IEEE.

  • Zhang Y, Ma Y, Tafazolli R. (2008) 'Improved Coded Cooperation Schemes for Wireless Communications'. IEEE 2008 6th International Symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks and Workshops, Vols 1 and 2, Berlin, GERMANY: 6th International Symposium on Modeling and Optimization in Mobile, Ad-Hoc, and Wireless Networks, pp. 507-512.
  • Yi N, Ma Y, Tafazolli R. (2008) 'Doubly differential communication assisted with cooperative relay'. IEEE 2008 IEEE 67TH VEHICULAR TECHNOLOGY CONFERENCE-SPRING, VOLS 1-7, Marina Bay, SINGAPORE: 67th IEEE Vehicular Technology Conference, pp. 644-647.
  • Liu H, Ma Y, Tafazolli R. (2008) 'Optimum pilot placement for chunk-based OFDMA uplink: Time direction scenario'. IEEE 2008 IEEE 67TH VEHICULAR TECHNOLOGY CONFERENCE-SPRING, VOLS 1-7, Marina Bay, SINGAPORE: 67th IEEE Vehicular Technology Conference, pp. 2547-2551.
  • Hoshyar R, Tafazolli R. (2008) 'Achievable full decode and forward rates for cooperative MIMO BICM systems'. IEEE IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Cannes, France: 19th PIMRC 2008
    doi: 10.1109/PIMRC.2008.4699628
  • Ghader M, Tafazolli R. (2007) 'Enhanced Service Location Protocol in Personal Network'. Jaipur, India: WPMC’07
  • Wathan FP, Hoshyar R, Tafazolli R. (2007) 'Iterated SISO MUD for synchronous uncoded CDMA systems over AWGN channel: Performance evaluation in overloaded condition'. IEEE 2007 INTERNATIONAL SYMPOSIUM ON COMMUNICATIONS AND INFORMATION TECHNOLOGIES, VOLS 1-3, Sydney, AUSTRALIA: International Symposium on Communication and Information Technology, pp. 397-402.
    doi: 10.1109/ISCIT.2007.4392052
    Full text is available at: http://epubs.surrey.ac.uk/1852/
  • Hanzo L, Tafazolli R. (2007) 'Throughput assurances through admission control for multi-hop MANETs'. IEEE 2007 IEEE 18TH INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, VOLS 1-9, Athens, GREECE: 18th IEEE International Symposium on Personal, Indoor and Mobile Radio Communication, pp. 1945-1949.
  • Li Z, Akhtar N, Tafazolli R. (2007) 'Seamless IP multimedia service continuity support in inter-worked UMTS and WLAN'. IEEE 2007 IEEE 18TH INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, VOLS 1-9, Athens, GREECE: 18th IEEE International Symposium on Personal, Indoor and Mobile Radio Communication, pp. 1478-1482.
  • Grandblaise D, Vivier G, Moessner K, Tafazolli R. (2007) 'Credit token based rental protocol for dynamic channel allocation'. 1st International Conference on Cognitive Radio Oriented Wireless Networks and Communications 2006, CROWNCOM,
    doi: 10.1109/CROWNCOM.2006.363463
    Full text is available at: http://epubs.surrey.ac.uk/2332/

    Abstract

    This paper describes a distributed, cooperative and real time rental protocol for DCA operations in a multi system and mult) cell context for OFDMA systems. A credit token based rental protocol using auctioning Is proposed in support of dynamic spectrum sharing between cells. The proposed scheme can be tuned adaptively as a function of the context by specifying the credit tokens usage in the radio etiquette. The application of the rental protocol is illustrated with an ascending bid auctioning. The paper also describes two approaches for BS-BS communications in support of the rental protocol. Finally, it is described how the proposed mechanisms contribute to the current approaches followed in the IEEE 802.16h and IEEE 802.22 standards efforts addressing cognitive radio, © 2006 IEEE.

  • Zhang Y, Ma Y, Tafazolli R. (2007) 'Tighter bounds of symbol error probability for amplify-and-forward cooperative protocol over rayleigh fading channels'. IEEE 2007 IEEE 18TH INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, VOLS 1-9, Athens, GREECE: 18th IEEE International Symposium on Personal, Indoor and Mobile Radio Communication, pp. 1920-1924.
  • Liu H, Ma Y, Tafazolli R. (2007) 'Sub-optimum pilot placement for chunk-based OFDMA uplink: Consecutive chunks scenario'. IEEE 2007 IEEE 18TH INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, VOLS 1-9, Athens, GREECE: 18th IEEE International Symposium on Personal, Indoor and Mobile Radio Communication, pp. 1925-1929.
  • Schott W, Gluhak A, Presser M, Hunkeler U, Tafazolli R. (2007) 'e-SENSE protocol stack architecture for wireless sensor networks'. IEEE 2007 PROCEEDINGS OF THE 16TH IST MOBILE AND WIRELESS COMMUNICATIONS, VOLS 1-3, Budapest, HUNGARY: 16th IST Mobile and Wireless Communications, pp. 464-468.
  • Liu H, Ma Y, Tafazolli R. (2007) 'Optimum pilot placement for chunk-based OFDMA uplink: Single chunk scenario'. IEEE 2007 IEEE 66TH VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-5, Baltimore, MD: 66th IEEE Vehicular Technology Conference, pp. 2194-2198.
    doi: 10.1109/VETECF.2007.460
  • Hanzo L, Tafazolli R. (2007) 'Quality of Service routing and admission control for mobile ad-hoc networks with a contention-based MAC layer'. IEEE 2006 IEEE International Conference on Mobile Adhoc and Sensor Systems, Vols 1 and 2, Vancouver, CANADA: IEEE International Conference on Mobile Adhoc and Sensor Systems, pp. 451-454.
  • Thilakawardana S, Acar G, Hale B, Tafazolli R. (2007) 'Impact of status retry timer values on MFTP performance over bgan satellite multicast'. IEEE 2007 IEEE 18TH INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, VOLS 1-9, Athens, GREECE: 18th IEEE International Symposium on Personal, Indoor and Mobile Radio Communication, pp. 4089-4094.
    Full text is available at: http://epubs.surrey.ac.uk/2399/
  • Grandblaise D, Moessner K, Vivier G, Tafazolli R. (2006) 'Rental protocol for automated spectrum sharing negotiation between base stations'. FACHVERLAG SCHIELE SCHON FREQUENZ, Karlsruhe, GERMANY: 4th Karlsruhe Workshop on Software Radios 60 (9-10), pp. 162-166.
    doi: 10.1515/FREQ.2006.60.9-10.162
  • Ghader M, Olsen RL, Prasad V, Jacobsson M, Sanchez L, Lanza J, Louati W, Girod-Genet M, Zeghlache D, Tafazolli R. (2006) 'Service Discovery in Personal Networks; design, implementation and analysis'. Mykonos, Greece: 15th IST Mobile and Wireless communications Summit
  • Acar G, Thilakawardana S, Tafazolli R, Evans B. (2006) 'Performance of Multicast File Transfer Protocol (MFTP) over geostationary satellite systems with DAMA uplinks'. Collection of Technical Papers - 24th AIAA International Communications Satellite Systems Conference, ICSSC, 1, pp. 61-74.
  • Presser M, Gluhak A, Babb D, Tafazolli R, Herault L. (2006) 'E-SENSE - Capturing ambient intelligence for mobile communications through wireless sensor networks'. INSTICC-INST SYST TECHNOLOGIES INFORMATION CONTROL & COMMUNICATION WINSYS 2006: Proceedings of the International Conference on Wireless Information Networks and Systems, Setubal Coll Business Adm, Setubal, PORTUGAL: International Conference on Wireless Information Networks and Systems, pp. 341-346.
  • Navaratnam P, Akhtar N, Tafazolli R. (2006) 'On the performance of DCCP in wireless mesh networks'. MobiWAC 2006 - Proceedings of the 2006 ACM International Workshop on Mobility Management and Wireless Access, 2006, pp. 144-147.
    doi: 10.1145/1164783.1164811
  • Nourizadeh H, Nourizadeh S, Tafazolli R. (2006) 'Impact of the Inter-relay Handoff on the Relaying System Performance'. IEEE 2006 IEEE 64TH VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-6, Montreal, CANADA: 64th IEEE Vehicular Technology Conference, pp. 2529-2533.
  • Qi Y, Hoshyar R, Tafazolli R. (2006) 'Capacity of Intelligent Quadrifiliar Helix Antenna (IQHA) based MIMO system'. IEEE 2006 IEEE International Workshop on Antenna Technology: Small Antennas and Novel Metamaterials (IWAT), White Plains, NY: 2nd IEEE International Workshop on Antenna Technology, pp. 365-368.
    Full text is available at: http://epubs.surrey.ac.uk/2312/
  • Hamid A, Hoshyar R, Tafazolli R. (2006) 'Band Based Dynamic Link Adaptation for MC-CDMA Radio Interface'. IEEE 2006 IEEE 64TH VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-6, Montreal, CANADA: 64th IEEE Vehicular Technology Conference, pp. 791-795.
  • Nourizadeh H, Nourizadeh S, Tafazolli R. (2006) 'Performance evaluation of Cellular Networks with Mobile and Fixed Relay Station'. IEEE 2006 IEEE 64TH VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-6, Montreal, CANADA: 64th IEEE Vehicular Technology Conference, pp. 2434-2438.
  • Georgiades M, Akhtar N, Ghader M, Li Z, Gultchev S, Tafazolli R. (2005) 'Surrey's Next Generation Wireless Network Testbed'. Marrakech, Morocco: 7th IEEE International Conference on Mobile and Wireless Communications Networks
  • Mirzadeh S, Tafazolli R. (2005) 'Secure Service Discovery for Personal Networks'. Shiraz, Iran: International Symposium on Telecommunications 2005 (IST2005)
  • Ghader M, Olsen RL, Giro-Genet M, Tafazolli R. (2005) 'Service Management Platform for Personal Networks'. Dresden, Germany: 14th IST Mobile and Wireless communications Summit
  • Ma Y, Tafazolli R. (2005) 'Exploiting hidden pilots for carrier frequency offset estimation for generalized MC-CDMA systems'. IEEE 2005 IEEE/SP 13th Workshop on Statistical Signal Processing (SSP), Vols 1 and 2, Bordeaux, FRANCE: 13th IEEE Workshop on Statistical Signal Processing, pp. 1237-1241.
  • Sali A, Widiawan A, Thilakawardana S, Tafazolli R, Evans BG. (2005) 'Cross-layer design approach for multicast scheduling over satellite networks'. IEEE 2nd International Symposium on Wireless Communications Systems 2005 (ISWCS 2005), Univ Siena, Siena, ITALY: 2nd International Symposium on Wireless Communications Systems (ISWCS 2005), pp. 701-705.
    doi: 10.1109/ISWCS.2005.1547797
    Full text is available at: http://epubs.surrey.ac.uk/2333/
  • Tang SY, Thilakawardana S, Tafazolli R, Qian Y. (2005) 'Performance analysis of predictive scalable resource allocation for integrated wireless networks'. IEEE 2005 INTERNATIONAL CONFERENCE ON WIRELESS NETWORKS, COMMUNICATIONS AND MOBILE COMPUTING, VOLS 1 AND 2, Maui, HI: International Conference on Wireless Networks, Communications and Mobile Computing, pp. 745-750.
  • Ghader M, Tafazolli R. (2004) 'Performance of Service Discovery Protocols in Personal Networks'. Shanghai, China: IST MAGNET Workshop, Visions and Beyond
  • Ghader M, Prasad N, Olsen RL, Mirzadeh S, Tafazolli R. (2004) 'Secure Resource and Service Discovery in Personal Networks Wireless'. Toronto, Canada: World Research Forum Meeting #12
  • Ghader M, Moessner K, Tafazolli R. (2004) 'Service Discovery and Provision Protocols for Wireless Networks'. Lyon, France: 13th IST Mobile & Wireless Communications Summit

Books

  • Forum WWR. (2006) Technologies for the wireless future. John Wiley & Sons

Book chapters

  • Hanzo L, Tafazolli R. (2008) 'Mobile Ad Hoc Networks: Challenges and Solutions for Providing Quality of Service Assurances'. in Kyriazakos S, Soldatos I, Karetsos G (eds.) 4g Mobile and Wireless Communications Technologies River Publishers

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