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Frequency Domain DFE for Single-Carrier STBC block Transmission

IEEE COMMUNICATIONS LETTERS 2013年第6期17卷 1108-1111页

作者： Wang, Qiucai Yuan, Chaowei Zhang, Jinbo Hu, Ziwei Li, Yingxue Beijing Univ Posts & Telecommun Sch Informat & Commun Engn Beijing 100876 Peoples R China Beijing Univ Posts & Telecommun Sch Elect Engn Beijing 100876 Peoples R China Changan Univ Sch Elect & Control Engn Xian 710064 Peoples R China

space-time block coding (STBC) is a novel transmit diversity technique that can substantially improve the reliability of wireless communication channel. In this letter, we investigate single-carrier STBC block transmission over frequency-selective fading channel. Based on the minimum mean square error (MMSE) criterion, by exploiting the reliability of tentative decision symbols, we propose a novel suboptimal, low complexity frequency domain decision feedback equalization (FD-DFE) scheme for SC STBC. Simulation results show that the proposed scheme provides better performance than the conventional scheme.

关键词： Single-carrier space-time block coding frequency domain decision feedback equalization frequency-selective fading channel

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Quadrature Spatial Modulation Aided Media-Based Modulation

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IEEE COMMUNICATIONS LETTERS 2022年第8期26卷 1928-1932页

作者： Li, Canlin Wang, Lei Nie, Gaoyang Xi An Jiao Tong Univ Sch Informat & Commun Engn Xian 710049 Peoples R China

In this work, we present the concept of quadrature spatial modulation aided media-based modulation (QSM-MBM), which combines QSM and MBM principles. The proposed two QSM-MBM schemes use dispersion matrices to generate QSM matrix and transmit it by designing two different channel state activation methods, which provides improved transmission rate, diversity gain as well as hardware simplicity. Simulations show that the proposed QSM-MBM schemes achieve remarkably better error performance than the existing MBM schemes.

关键词： Radio frequency Modulation Indexes Mirrors Diversity methods Receivers Encoding MIMO systems index modulation media-based modulation space-time block coding

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Equivalence of Optimum and Joint Processing Receivers for space-time block Coded Systems

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2009年第1期8卷 51-54页

作者： Garg, Parul Mallik, Ranjan K. Netaji Subhas Inst Technol Div Elect & Commun Engn New Delhi 110078 India Indian Inst Technol Delhi Dept Elect Engn New Delhi 110016 India

A space-time block coded system in a correlated Rayleigh flat fading environment with transmit and receive correlation is considered. The channel state information (CSI) is estimated from a sequence of pilot code vectors which are known to the receiver and transmitted prior to data code transmission. Two receiver structures, namely the optimum receiver in which the estimated CSI is used in the maximum likelihood sense and the joint processing receiver that jointly processes the received data code and the received pilot code vectors, are presented an their equivalence is shown.

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A New Result on Turbo Coded QO-STBC Schemes

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IEEE COMMUNICATIONS LETTERS 2010年第3期14卷 199-201页

作者： Park, Unhee Kim, Youngmin Kim, Sooyoung Chonbuk Natl Univ Div Elect & Informat Engn Jeonju South Korea

In this letter, we present a new result on turbo coded quasi orthogonal space time block coding (QO-STBC) schemes. Proper utilization of soft decision information is one of the important factors affecting the performance of turbo codes. If a space time block coding (STBC) scheme is used with turbo codes, the output of the STBC decoder must be fed into a turbo code decoder as soft decision information. Therefore, the performance of turbo codes depends on how the STBC scheme generates soft decision information from its detection process. In this letter, we investigate the performance of turbo coded QO-STBC schemes, and present the optimum soft decision metrics.

关键词： space-time block coding QO-STBC soft decision turbo codes

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CM-Based channel estimators for space-time block-coded M-PSK and M-QAM systems

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IEEE COMMUNICATIONS LETTERS 2003年第7期7卷 311-313页

作者： Xu, CJ Le-Ngoc, T McGill Univ Dept Elect & Comp Engn Montreal PQ H3A 2A7 Canada Nanjing Univ Posts & Telecommun Dept Telecommun Engn Nanjing 210003 Peoples R China

A constant modulus (CM)-based channel estimation scheme for space-time block-coded MPSK and M-QAM transmission systems is derived. Exploiting the orthogonal structure of the space-time block coded transmission model, the analytical solutions to minimize the CM cost function are given for 2(k) PSK (k > 2) and 2(2k)-QAM schemes, and used to derive the expressions for the CM-based channel estimators. Illustrative results on the performance are presented.

关键词： channel estimation constant modulus space-time block coding transmit diversity

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Blind vector channel estimation for differentially modulated systems with transmit diversity

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IEICE TRANSACTIONS ON COMMUNICATIONS 2004年第7期E87B卷 2017-2020页

作者： Kang, JH Kim, J Xu, GH Powers, EJ Informat & Commun Univ Sch Engn Taejon South Korea Univ Texas Dept Elect & Comp Engn Austin TX 78712 USA Navini Networks Dallas TX 75082 USA

We consider vector channel estimation for differentially modulated systems with transmit diversity. We propose a blind estimation scheme to yield superior performance to that of the pilot-aided estimation. The proposed scheme utilizes the repeated transmission of space-time coded data symbols. We compare the performance of the proposed blind scheme with the pilot-based estimation scheme via computer simulations.

关键词： vector channel estimation space-time block coding transmit diversity

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Cooperative diversity with multiple-antenna nodes in fading relay channels

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2008年第8期7卷 3036-3046页

作者： Muhaidat, Hakam Uysal, Murat Univ Toronto Dept Elect & Comp Engn Toronto ON M5S 1A1 Canada Univ Waterloo Dept Elect Engr Waterloo ON N2L 3G1 Canada

In this paper, we investigate the performance of a single-relay cooperative scenario where the source, relay and destination terminals are equipped with multiple transmit/receive antennas. We assume that conventional space-time block codes are employed in the underlying source-to-destination (S -> D), source-to-relay (S -> R) and relay-to-destination (R -> D) links, and consider both decode-and-forward (DaF) and amplify-and-forward (AaF) relaying techniques. For the latter one, we consider two variants based on the availability of channel state information (CSI);namely, blind AaF and CSI-assisted AaF. Through the derivation of pairwise error probability, we quantify analytically the impact of multiple antenna deployment for each relaying technique under various scenarios which involve relay location and power control assumptions imposed on cooperating nodes. Our transmission model assumes that. the source and destination terminals are equipped with M-s transmit and N receive antennas, respectively, and the relay terminal is equipped with M-R receive and M-T transmit antennas. For a scenario where R -> D and S -> D links are balanced and S -> R link experiences sufficiently large SNR, our performance analysis demonstrates that the maximum achievable diversity order is M-T min(M-S, N)+MSN for blind AaF scheme and N(M-T+M-S) for both CSI-assisted AaF and DaF schemes. For another scenario where R D link has a sufficiently large SNR and S R and S D links are balanced, CSI-assisted AaF, blind AaF and DaF schemes achieve diversity orders of M-S(N + M-R), M-S(N + and M-T), and MSN respectively. Other scenarios involving the availability of non-fading R. D link and poor inter-user channel quality are further investigated. An extensive Monte Carlo simulation study is also presented to corroborate the analytical results and to provide detailed performance comparisons among the three relaying techniques under consideration.

关键词： cooperative diversity space-time block coding multiple antennas fading channels pairwise error probability

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Adaptive modulation for multiantenna transmissions with channel mean feedback

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2004年第5期3卷 1626-1636页

作者： Zhou, SL Giannakis, GB Univ Connecticut Dept Elect & Comp Engn Storrs CT 06269 USA Univ Minnesota Dept Elect & Comp Engn Minneapolis MN 55455 USA

Adaptive modulation has the potential to increase the system throughput significantly by matching transmitter parameters to time-varying channel conditions. However, adaptive modulation schemes that rely on perfect channel state information (CSI) are sensitive to CSI imperfections induced by estimation errors and feedback delays. In this paper, we design adaptive modulation schemes for multiantenna transmissions based on partial CSI, that models the spatial fading channels as Gaussian random variables with nonzero mean and white covariance, conditioned on feedback information. Based on a two-dimensional beamformer, our proposed transmitter optimally adapts the basis beams, the power allocation between two beams, and the signal constellation, to maximize the transmission rate, while maintaining a target bit-error rate. Adaptive trellis-coded multiantenna modulation is also investigated. Numerical results demonstrate the rate improvement, and illustrate an interesting tradeoff that emerges between feedback quality and hardware complexity.

关键词： adaptive modulation channel feedback eigen-beamforming multiantenna transmissions space-time block coding trellis-coded modulation

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Frequency-Domain Equalization for Single-Carrier space-time block Coded Transmit Diversity in a High Mobility Environment

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IEICE TRANSACTIONS ON COMMUNICATIONS 2016年第5期E99B卷 1180-1188页

作者： Miyazaki, Hiroyuki Adachi, Fumiyuki Tohoku Univ Grad Sch Engn Dept Commun Engn Sendai Miyagi 9808579 Japan

Single-carrier (SC) transmission with space-time block coded (STBC) transmit diversity can achieve good bit error rate (BER) performance. However, in a high mobility environment, the STBC codeword orthogonality is distorted and as consequence, the BER performance is degraded by the interference caused by the orthogonality distortion of STBC codeword. In this paper, we proposed a novel frequency-domain equalization (FDE) for SC-STBC transmit diversity in doubly selective fading channel. Multiple FDE weight matrices, each associated with a different code block, are jointly optimized based on the minimum mean square error (MMSE) criterion taking into account not only channel frequency variation but also channel time variation over the STBC codeword. Computer simulations confirm that the proposed robust FDE achieves BER performance superior to conventional FDE, which was designed based on the assumption of a quasi-static fading.

关键词： space-time block coding frequency-domain equalization doubly selective fading

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Unified Analysis of Multiuser Scheduling for Downlink MIMO Systems with Imperfect CSI

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2014年第3期13卷 1344-1355页

作者： Yu, Xiangbin Dang, Xiaoyu Leung, Shu-Hung Liu, Yan Yin, Xin Nanjing Univ Aeronaut & Astronaut Dept Elect Engn Nanjing Jiangsu Peoples R China City Univ Hong Kong Dept Elect Engn Hong Kong Hong Kong Peoples R China City Univ Hong Kong State Key Lab Millimeter Wave Hong Kong Hong Kong Peoples R China City Univ Hong Kong Dept Elect Engn Hong Kong Hong Kong Peoples R China

In this paper, unified BER performance and outage probability analyses of downlink multiuser scheduling for multiple-input multiple-output (MUS-MIMO) transmission/combining (transceiving) systems with imperfect channel state information (CSI) caused by feedback over Rayleigh fading channels is presented. The unified analysis is applicable to MIMO transceiving systems whose received signal-to-noise ratio (SNR) is given as largest order statistic of chi-square distribution. The performance of MUS-MIMO employing selective transmission/selective combining (ST/SC), ST/maximum ratio combining (MRC) and space-time block codes (STBC) can be analyzed by this general framework. Accurate and approximate unified closed-form BER and outage probability expressions of the MUS-MIMO transceiving system with normalized SNR-based scheduling in heterogeneous networks are derived. Based on the approximate BER and outage probability expressions, diversity gains are analyzed at high SNR. The results indicate that the MUS-MIMO for using the three transceiving schemes can achieve full diversity order for perfect CSI, while the diversity gain is degraded differently for the three transceiving schemes under imperfect CSI. Computer simulation shows that the theoretical analysis is in good agreement with simulation results, and the approximate BER expressions are very close to the accurate ones but with lower computational complexity.

关键词： Multiuser MIMO bit error rate user scheduling space-time block coding antenna selection imperfect CSI

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