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Improved scheme with cooperative diversity based on distributed space-time block coding

Journal of Systems Engineering and Electronics 2009年第3期20卷 463-469页

作者： Du Na Xu Dazhuan Coll. of Information Science & Technology Nanjing Univ. of Aeronautics and Astronautics Nanjing 210016 P. R. China

An improved scheme with cooperative diversity based on distributed space-time block coding （WCD- DSTBC） is proposed, which effectively achieves diversity gains and improves the performance of the system by sharing some single-antenna users＇ antennas to form a virtual antenna array and combining with distributed spacetime block coding （DSTBC） mode. Then the relation between the system BER and the interuser BER for WCDDSTBC scheme is theoretically derived and the closed-form expression of BER for WCD-DSTBC system is obtained. The simulation results show that the proposed WCD-DSTBC scheme achieves distinct gains over the non-cooperative multi-carrier CDMA （MC-CDMA） system. When system BER is le-3 and interuser BER is le-3, about 2.5 dB gain can be gotten. When interuser channel state information （CSI） outgoes the users＇ individual CSI, about 3 dB gain is also achieved.

关键词： multiple input multiple output cooperative diversity distributed space-time block coding multicarrier CDMA.

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Signal Detection for distributed space-time block coding: 4 Relay Nodes under Quasi-Synchronisation

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IEEE TRANSACTIONS ON COMMUNICATIONS 2009年第5期57卷 1250-1255页

作者： Zheng, F. -C. Burr, A. G. Olafsson, S. Victoria Univ Sch Elect Engn Melbourne Vic 8001 Australia Univ York Dept Elect York YO10 5DD N Yorkshire England Reykjavik Univ IS-103 Reykjavik Iceland Mobil Res Ctr BT Grp CTO BT Ipswich Suffolk England

Most research on distributed space-time block coding (D-STBC) has so far focused on the case of 2 relay nodes and assumed that the relay nodes are perfectly synchronised at the symbol level. This paper applies STBC to 4-relaynode systems under quasi-synchronisation and derives a new detector based on parallel interference cancellation, which proves to be very effective in suppressing the impact of imperfect synchronisation.

关键词： distributed space-time block coding distributed transmit diversity cooperative diversity cooperative relay

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Near-Optimum Detection for distributed space-time block coding under Imperfect Synchronization

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IEEE TRANSACTIONS ON COMMUNICATIONS 2008年第11期56卷 1795-1799页

作者： Zheng, F-C. Burr, A. G. Olafsson, S. Victoria Univ Sch Elect Engn Melbourne Vic 8001 Australia Univ York Dept Elect York YO10 5DD N Yorkshire England Reykjavik Univ IS-103 Reykjavik Iceland BT BT Grp CTO Mobil Res Ctr Ipswich Suffolk England

Significant performance gain can potentially be achieved by employing distributed space-time block coding (D-STBC) in ad hoc or mesh networks. So far, however, most research on D-STBC has assumed that cooperative relay nodes are perfectly synchronized. Considering the difficulty in meeting such an assumption in many practical systems, this paper proposes a simple and near-optimum detection scheme for the case of two relay nodes, which proves to be able to handle far greater timing misalignment than the conventional STBC detector.

关键词： distributed space-time block coding distributed transmit diversity cooperative diversity cooperative relay

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Two time slots distributed time-reversal space-time block coding for single-carrier block transmissions

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IET COMMUNICATIONS 2013年第18期7卷 2026-2033页

作者： Wang, Qiucai Yuan, Chaowei Zhang, Jinbo Du, Jianhe Beijing Univ Posts & Telecommun Sch Informat & Commun Engn Beijing 100876 Peoples R China

distributed space-time block coding (STBC) is a promising technique for future broadband wireless communication system, because of its substantially improving the reliability of wireless channel by exploiting cooperative spatial diversity. In this study, the authors propose a novel two time slots distributed time-reversal STBC scheme for amplify-and-forward relay-assisted single-carrier (SC) block transmissions over frequency-selective fading channel. They first exploit the discrete Fourier transform extended properties to construct a linear precoding matrix. They then employ a low-complexity suboptimal frequency domain decision feedback equalisation (FD-DFE) to collect potential multipath diversity at high signal-to-noise ratio. Simulation results demonstrate that the proposed scheme provides better performance than the conventional distributed SC-STBC scheme with minimum-mean-square error FD linear equalisation.

关键词： computational complexity decision feedback equalisers discrete Fourier transforms diversity reception fading channels frequency-domain analysis linear predictive coding matrix algebra mean square error methods radiocommunication telecommunication network reliability space-time block codes amplify and forward communication cooperative communication minimum-mean-square error FD linear equalisation conventional distributed SC-STBC scheme signal-to-noise ratio multipath diversity low-complexity suboptimal frequency domain decision feedback equalisation linear precoding matrix discrete Fourier transform extended property frequency-selective fading channel SC block transmissions amplify-and-forward relay-assisted single-carrier block transmissions distributed time-reversal STBC scheme cooperative spatial diversity wireless channel reliability broadband wireless communication system distributed space-time block coding distributed time-reversal space-time block coding

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Quasi-orthogonal time-reversal space-time block coding for frequency-selective fading channels

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2007年第2期55卷 772-778页

作者： Mheidat, Hakam Uysal, Murat Al-Dhahir, Naofal Univ Waterloo Dept Elect & Comp Engn Waterloo ON N2G 3L1 Canada Univ Texas Dept Elect Engn Richardson TX 75083 USA

Quasi-orthogonal space-time block codes (QO-STBCs) are a powerful code family designed for more than two transmit antennas. In contrast to their orthogonal counterparts designed for the same number of transmit antennas, QO-STBCs are able to provide full-rate transmission rate. While original QO-STBCs enjoy only a partial diversity, the recently proposed rotated versions of QO-STBCs achieve the maximum diversity order which is equal to the number of transmit antennas. Since QO-STBCs have been originally proposed foe frequency-flat fading channels, it is a challenging design problem to apply them over frequency-selective channels. The dispersive nature of such channels results in intersymbol interference which needs to be carefully handled at the receiver. In this paper, we investigate time-domain equalization for QO-STBC, exploiting the embedded quasi-orthogonal structure to design low-complexity receivers. We also present diversity gains for the proposed scheme through pairwise error probability (PEP) derivation and analysis which are further confirmed by. Monte Carlo simulations.

关键词： cooperative diversity distributed space-time block coding equalization fading channels pairwise error probability

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On the performance of distributed space-time block codes in cooperative relay networks

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IEEE COMMUNICATIONS LETTERS 2007年第5期11卷 411-413页

作者： Unger, Timo Klein, Anja Tech Univ Darmstadt Inst Telecommun Commun Engn Lab D-64287 Darmstadt Germany

In this paper, space-time block codes (STBCs) are applied in a distributed fashion in a scenario with multiple cooperating relay stations (RSs) having multiple antennas. By applying the Chernoff bound to the theoretical bit error rate (BER) in Rayleigh fading channels, it turns out that the BER performance has a higher sensitivity to spatial correlation in Multiple Input Multiple Output channels than to different receive powers at the receiver from different cooperating RSs. If the number of overall available antennas exceeds the number of required antennas for the considered STBC, based on the theoretical analysis a criterion for the selection of the antennas which should cooperate in order to achieve the best BER performance is given.

关键词： distributed space-time block coding cooperative relaying antenna selection

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Spatial channel pairing based coherent combining for relay networks

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Frontiers of Information Technology & Electronic Engineering 2016年第9期17卷 938-945页

作者： Feng SHU Xiao-hui HUANG Jin-song HU Ting-ting LIU Ri-qing CHEN Xiao-hu YOU Jun LI Jin WANG College of Computer and Information Sciences Fujian Agriculture and Forestry University School of Electronic and Optical Engineering Nanjing University of Science and Technology National Key Laboratory of Electromagnetic Environment China Research Institute of Radiowave Propagation National Mobile Communications Research Laboratory Southeast University

In this paper, spatial channel pairing(SCP) is introduced to coherent combining at the relay in relay networks. Closed-form solution to optimal coherent combining is derived. Given coherent combining, the approximate SCP solution is presented. Finally, an alternating iterative structure is developed. Simulation results and analysis show that, given the symbol error rate and data rate, the proposed alternating iterative structure achieves signal-to-noise ratio gains over existing schemes in maximum ratio combining(MRC) plus matched filter,MRC plus antenna selection, and distributed space-time block coding due to the use of SCP and iterative structure.

关键词： Spatial channel pairing Coherent combining Alternating iterative structure Symbol error rate distributed space-time block coding

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Outage analysis of blind cooperative diversity

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WIRELESS COMMUNICATIONS & MOBILE COMPUTING 2013年第10期13卷 908-915页

作者： Tourki, Kamel Alouini, Mohamed-Slim TAMUQ ECEN Dept Educ City Doha Qatar King Abdullah Univ Sci & Technol KAUST Div Phys Sci & Engn Thuwal 239556900 Makkah Province Saudi Arabia

Mobile users with single antennas can still take advantage of spatial diversity through cooperative space-time-encoded transmission. In this paper, we considered a scheme in which a relay chooses to cooperate only if its source-relay channel is of an acceptable quality, and we evaluate the usefulness of relaying when the source acts blindly and ignores the decision of the relays whether they may cooperate or not. In our study, we consider the regenerative relays in which the decisions to cooperate are based on a targeted end-to-end data rate R. We derived the end-to-end outage probability for a transmission rate R and a code rate and look at a power allocation strategy between the source and the relays in order to minimize the end-to-end outage probability at the destination for high signal-to-noise ratio, by using the golden section search method. Performance results show that the computer simulations-based results coincide with our analytical results. Copyright (c) 2011 John Wiley & Sons, Ltd.

关键词： distributed space-time block coding cooperative diversity blind cooperation regenerative relaying outage probability

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Design, Implementation, and Characterization of a Cooperative Communications System

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2011年第6期60卷 2534-2544页

作者： Murphy, Patrick Sabharwal, Ashutosh Rice Univ Dept Elect & Comp Engn Houston TX 77005 USA

Cooperative communications is a class of techniques that seek to improve reliability and throughput in wireless systems by pooling the resources of distributed nodes. Although cooperation can occur at different network layers and time scales, physical-layer cooperation at symbol time scales offers the largest benefit in combating losses due to fading. However, symbol-level cooperation poses significant implementation challenges, particularly in synchronizing the behavior and carrier frequency of distributed nodes. We present the implementation and characterization of a complete real-time cooperative physical-layer transceiver built on the Rice University Wireless Open-Access Research Platform (WARP). In our implementation, autonomous nodes employ physical-layer cooperation without a central synchronization source and can select between noncooperative and cooperative communications per packet. Cooperative transmissions use a distributed Alamouti space-time block code (STBC) and employ either amplify-and-forward (AF) or decode-and-forward (DF) relaying. We also present experimental results of our transceiver's real-time performance under various topologies and propagation conditions. Our results clearly demonstrate significant performance gains (more than 40x improvement in packet error rate in some topologies) provided by physical-layer cooperation, even when subject to the constraints of a real-time implementation. Finally, we present methodologies for isolating and understanding the sources of performance bottlenecks in our design. As with all our work on WARP, our transceiver design and experimental framework are available through the open-source WARP repository for use by other wireless researchers.

关键词： Cooperative communications decode-and-forward relaying distributed space-time block coding orthogonal frquency-division multiplexing performance analysis physical layer synchronization

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Single-Carrier Frequency Domain Equalization for Broadband Cooperative Communications

Single-Carrier Frequency Domain Equalization for Broadband C...

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IEEE Wireless Communications and Networking Conference

作者： Mheidat, Hakam Uysal, Murat Al-Dhahir, Naofal Univ Waterloo Dept Elect & Comp Engr Waterloo ON N2L 3G1 Canada Univ Texas Dallas Dept Elect Engn Dallas TX USA

ISBN: (纸本)9781424402694;9781424402700

In this paper, we investigate single carrier frequency-domain equalization (SC-FDE) for distributed space-time block codes (D-STBC) in a relay-assisted transmission scenario over frequency-selective fading channels. We assume the special case of a single-relay where the source-to-relay (S -> R), relay-to-destination (R -> D), and source-to-destination (S -> D) links experience possibly different channel delay spreads. Assuming perfect power control between R -> D and S -> D links and high signal-to-noise ratio for all underlying links, our performance analysis demonstrates that SC-FDE for D-STBC is able to achieve a maximum diversity order of min (L-1, L-3) + L-2 + 2 where L-1, L-2, and L-3 are the channel memory lengths for S -> R, S -> D, and R -> D links, respectively. This illustrates that the smaller of the multipath diversity orders experienced in S -> R and R -> D links becomes the performance bottleneck for the relaying path. For the special case of a non-fading relaying path where line-of-sight propagation is possible in either one of these underlying links, we demonstrate that the maximum diversity orders of L-1 + L-2 + 2 and L-3 + L-2 + 2 are achievable assuming non-fading R -> D and S -> R links, respectively. An extensive Monte Carlo simulation study is presented to corroborate the analytical results and to provide detailed performance comparisons among the competing schemes.

关键词： Cooperative diversity distributed space-time block coding equalization fading channels pairwise error probability

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