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space-time block coding for Doubly-Selective Channels

IEEE TRANSACTIONS ON SIGNAL PROCESSING 2010年第3期58卷 1934-1940页

作者： Fang, Kun Leus, Geert Delft Univ Technol Fac Elect Engn Math & Comp Sci NL-2628 CD Delft Netherlands

In this paper, we present a new spacetime block code for time-and frequency-selective (doubly-selective) channels. It can be interpreted as the extension of the Alamouti code to doubly-selective channels, and relies on a joint time frequency reversal of the transmitted sequences. Under certain channel conditions, the proposed spacetime block code belongs to the class that achieves full spatial, delay, and Doppler diversity using a maximum-likelihood (ML) receiver, as well as a linear zero-forcing (LZF) or linear minimum mean-squared error (LMMSE) receiver. For realistic doubly-selective channels, a real-valued linear data model is presented, for which different receiver structures can be developed.

关键词： Delay diversity Doppler diversity doubly-selective channels space-time block coding

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space-time block coding iterative multiuser receiver

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JOURNAL OF CIRCUITS SYSTEMS AND COMPUTERS 2003年第1期12卷 19-30页

作者： Jiang, HR Kwak, KS Inha Univ Dept Elect Engn Inchon 402751 South Korea

We present a multiuser receiver for CDMA systems with the combination of turbo channel coding and space-time block coding. A turbo scheme based on multiuser detection, soft interference cancellation and decoding is provided, and the algorithms for space-time decoding and separately interference suppressing are derived in this paper. The multiuser detection consists of multiuser interference suppression and single-user space-time decoding. Then we develop the iterative multiuser receiver based on the soft estimates of the interfering users' symbols. Moreover, simulation is given to verify the effectiveness of the multiuser receiver.

关键词： space-time block coding interference cancellation multiuser receiver CDMA

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space-time block coding-Based Beamforming for Beam Squint Compensation

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IEEE WIRELESS COMMUNICATIONS LETTERS 2019年第1期8卷 241-244页

作者： Liu, Ximei Qiao, Deli East China Normal Univ Sch Informat Sci & Technol Shanghai 200241 Peoples R China East China Normal Univ Shanghai Key Lab Multidimens Informat Proc Shanghai 200241 Peoples R China

In this letter, the beam squint problem, which causes significant variations in radiated beam gain over frequencies in a millimeter wave communication system, is investigated. A constant modulus beamformer design, which is formulated to maximize the expected average beam gain within the bandwidth with limited variation over frequencies within the bandwidth, is proposed. A semidefinite relaxation method is developed to solve the optimization problem under the constant modulus constraints. Depending on the eigenvalues of the optimal solution, either direct beamforming or transmit diversity-based beamforming is employed for data transmissions. Through numerical results, the proposed transmission scheme can compensate for beam squint effectively and improve system throughput. Overall, a transmission scheme for beam squint compensation in wide-band wireless communication systems is provided.

关键词： Millimeter wave beamforming space-time block coding beam squint throughput

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space-time block coding and beamforming for MC-CDMA transmission

Space-time block coding and beamforming for MC-CDMA transmis...

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10th International Conference on Advanced Communication Technology

作者： Suleesathira, Raungrong Limpakuntorn, Voravat King Mongkuts Univ Technol Fac Engn Dept Elect & Telecommun Engn Bangkok 10140 Thailand

ISBN: (纸本)9788955191356

This paper presents a MIMO adaptive beamforming in the MC-CDMA system. At the transmitter, a space-time block coding is concatenated to MC-CDMA modulation. At the receiver, an adaptive GSC beamformer is to filter the desired user and suppress interferences by beamspace processing. Combined with the space-time block coding, the smart antenna forms multi-mainbeams toward the desired user. The system performance is evaluated by illustrating the estimated DOAs, beampatterns, weight convergence and BERs in both the flat and frequency selective fadings.

关键词： space-time block coding adaptive beamforming MC-CDAM

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Performance Enhancement of Multiuser Passive time Reversal Communication Based on space-time block coding

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China Ocean Engineering 2010年第1期24卷 173-182页

作者：宫改云姚文斌潘翔宫先仪 Department of Information Science and Electronic Engineering Zhejiang University Institute of Applied Mathematics and Engineering Calculation Hangzhou Dianzi University Logistic Technology School Zhejiang Technology Institute of Economy

Reliable, with high data rate, acoustic communication in time-valTing, multipath shallow water environment is a hot research topic recently. Passive time reversal communication has shown promising results in improvement of the system performance. In multiuser environment, the system performance is significantly degraded due to the interference among different users. Passive time reversal can reduce such interference by minimizing the cross-correlated version of channel impulse response among users, which can be realized by the well-separated users in depth. But this method also has its shortcomings, even with the absence of relative motion, the minimization sometimes may be impossible because of the time-varying environment. Therefore in order to avoid the limitation of minimizing the cross-correlated channel function, an approach of passive time reversal based on space-time block coding （STBC） is presented in this paper. In addition, a single channel equalizer is used as a pest processing technique to reduce the residual symbol interference. Experimental results at 13 kHz with 2 kHz bandwidth demonstrate that this method has better performance to decrease bit error rate and improve signal to noise ratio, compared with passive time reversal alone or passive time reversal combined with equalization.

关键词： multiuser passive time reversal space-time block coding equalization

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Detection for space-time block coding over time-Selective Fading Channels

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IEICE TRANSACTIONS ON COMMUNICATIONS 2008年第12期E91B卷 4050-4053页

作者： Yu, Donghun Lee, Hong Seoul Natl Univ Sch Elect Engn & Comp Sci Seoul 151742 South Korea

A detector for space-time block coding is proposed to combat time-selective fading. To suppress both noise and interference, a minimum mean square error (MMSE) based detector is introduced for space-time block coding. It is shown by simulations that the proposed detector outperforms the conventional detectors when the channel is time-selective fading.

关键词： detectors time-selective fading channels least mean square methods MIMO systems space-time block coding

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Performance bounds of space-time block coding in Rician and log-normal fading channels

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IET COMMUNICATIONS 2007年第1期1卷 86-91页

作者： Papadopoulos, G. D. Karagiannidis, G. K. Pavlidou, F. N. Aristotle Univ Thessaloniki Dept Elect & Comp Engn Div Telecommun GR-54124 Thessaloniki Greece

Analytical expressions concerning the capacity and bit error rate (BER) of multiple-input multiple-output systems with space-time block coding (STBC) are derived. Two fading environments are examined, log-normal and Rician channels. A tight closed-form upper bound is presented for the BER of systems operating in log-normal fading environments in addition to an upper bound for the capacity of this type of systems. The latter bound applies to systems that operate under Rician fading as well. The analytical results were validated against ample numerical simulations for three STBC schemes and three phase-shift-keying modulations. The proposed bounds proved to. be a tractable way to evaluate the system performance when no closed-form expression for the probability density function or the moment generating function is known.

关键词： block codes closed-form upper bound Rician channels capacity probability density function MIMO communication BER phase shift keying log-normal fading channels log normal distribution channel capacity space-time block coding STBC scheme Rician channels error statistics channel coding phase-shift-keying modulations bit error rate moment generating function multiple-input multiple-output systems space-time codes

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Channel capacity and space-time block coding for coherent optical MIMO multi-mode fiber links

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OPTIK 2013年第10期124卷 922-927页

作者： Han, Jiawei Zhang, Jie Zhao, Yongli Gu, Wanyi Beijing Univ Posts & Telecommun State Key Lab Informat Photon & Opt Commun Beijing 100876 Peoples R China

The capacity enhancement for random coherent optical multiple-input multiple-output (MIMO) channels in multi-mode fiber (MMF) links is investigated theoretically. Additionally, the performance of space-time block coding (STBC) techniques for achieving high reliability optical MIMO transmission is numerically examined. A comparative study is performed by considering several schemes that employ multiple transmitters/receivers. Simulation results of these schemes, in terms of bit error rate (BER) as a function of optical signal to noise ratio (OSNR), are provided. (C) 2012 Elsevier GmbH. All rights reserved.

关键词： Coherent optical MIMO Multi-mode fiber links Channel capacity space-time block coding

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Coverage and reliability analysis of multi-IRS-aided distributed space-time block coding in MISO wireless communication systems

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PHYSICAL COMMUNICATION 2024年 63卷

作者： Wang, Xudong Feng, Lei Zhou, Fanqin Li, Wenjing BUPT State Key Lab Networking & Switching Technol Beijing 100876 Peoples R China

Intelligent reflecting surface (IRS) can realize information manipulation and signal modulations to perform space-time coding wireless communication. This article introduces a novel model to perform space-time block coding (STBC), where the base station transmits multiple symbols to a destination through multiple IRS that are utilized to adjust the phase shift and establish strong links. To maximize the end-to-end SNR, we propose a graph theory based method to obtain the optimal transmit antenna selection (TAS) scheme. Based the optimal TAS scheme, we derive the statistical characterizations of the sum of independent generalized gamma random variables to obtain end-to-end signal-to-noise ratio expressions. Then, the closed-form expressions of outage probability (OP) and symbol error rate (SER) are formulated respectively to evaluate the coverage and reliability performance in wireless communication systems. Furthermore, the asymptotic expressions for OP and SER at a high transmission power are given, then the diversity order is discussed to observe the performance limit. To verify this theoretical performance analysis, extensive computer simulations are conducted to prove its effectiveness. The simulation results show that the multi-IRS-aided STBC system can attain the same or even better performance as the STBC system based on multiple amplify-and-forward relays using a little number of reflecting elements. More interestingly, the OP and SER of this system decrease more than that of the relays-aided system as transmission power increases.

关键词： Intelligent reflecting surface space-time block coding Outage probability Symbol error rate Phase shift Relay

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A novel scheme for space-time block coding with a variable transmit diversity gain in OFDM systems

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IEEE TRANSACTIONS ON CONSUMER ELECTRONICS 2004年第2期50卷 478-483页

作者： Ren, GL Zhang, H Chang, YL Xidian Univ State Key Lab ISN Xian 710071 Peoples R China

A novel scheme for space-time block coding with a variable transmit diversity gain is proposed for OFDM systems in the paper. The OFDM symbols are divided into two groups of orthogonal sub-symbols with each group coded in Alamouli STBC in the coding, and the new scheme for STBC is constructed by differently combining the coded data of each group with the different transmit diversity gain able to be achieved by linearly processing and correspondingly combining the received data on the sub-carriers. The proposed scheme is feasible to he used in video transmission and a new unequal error protection applied to MPEG-4 video transmission is discussed. The results of computer simulation show that the proposed scheme has double diversity gain and quadruple diversity gain. The new unequal error protection scheme has a gain more than 8dB and higher efficiency than the UEP based on the RCPC codes.

关键词： space-time block coding OFDM variable transmit diversity gain

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