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Closed-loop transmit diversity schemes for five and six transmit antennas

IEEE SIGNAL PROCESSING LETTERS 2005年第2期12卷 130-133页

作者： Milleth, JK Giridhar, K Jalihal, D Indian Inst Technol Dept Elect Engn Telecommun & Comp Networks Grp Madras 600036 Tamil Nadu India

Closed-loop, rate-one, channel orthogonalized space-time block codes (CO-STBCs) for three and four transmit antennas using a single (real) phase feedback term have been proposed [1]. These codes achieve full diversity and result in maximum likelihood (ML) decoding with only linear processing at the receiver similar to OSTBCs. In this paper, we propose a closed-loop STBC for five and six transmit antennas with rate 3/4, where the one parameter feedback angle can be evaluated in closed form. These codes achieve full diversity and are delay optimal. Simulation results comparing the error-rate performance of the CO-STBC with open-loop OSTBC as well as some quasiorthogonal space-time block codes are also provided. While the 1- to 5-dB gain accrued by the closed-loop scheme (over the open-loop methods) is not surprising, the novel contribution of this work is in the approach taken to derive the feedback parameter as a single phase term, which is purely a function of the channel gains.

关键词： closed-loop diversity orthogonal STBC space-time block coding

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Simple space-time coded SS-CDMA systems capable of perfect MUI/ISI elimination

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IEEE COMMUNICATIONS LETTERS 2001年第12期5卷 471-473页

作者： Barbarossa, S Cerquetti, F Univ Roma La Sapienza Informat & Commun Dept Rome Italy

In this letter we propose a very simple strategy for combining space-time block coding (STBC) with code division multiple access (CDMA) to be used in single-user links or in broadcasting over time-dispersive channels. The proposed system provides the desired space diversity gain and is capable of perfect cancellation of multiuser interference (MUI) and intersymbol interference (ISI), using a very simple receiver structure. The advantage is obtained by simply incorporating cyclic prefixes in the user codes. We provide a theoretical analysis, verified via simulation results, and a comparison between CDMA and OFDMA systems incorporating STBC.

关键词： code division multiple access space-time block coding

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A cooperative transmit diversity scheme for mobile satellite broadcasting systems

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND NETWORKING 2010年第5-6期28卷 352-368页

作者： Ahn, Do Seob Kim, Sooyoung Kim, Hee Wook Park, Dong-Chul Chonbuk Natl Univ Div Elect & Informat Engn Jeonju 561756 South Korea ETRI Satellite Wireless Convergence Res Div Taejon South Korea Chungnam Natl Univ Dept Radio Sci & Engn Taejon South Korea

In this study, we propose an efficient cooperative diversity scheme for mobile satellite multimedia broadcasting systems. The proposed scheme is a transmit diversity technique for adapting different channel environments, and thus, no channel quality information from the return link is needed. In the proposed scheme, we utilize space-time block codes and rate-compatible turbo codes to achieve diversity gains and additional coding gains, respectively. The satellite and several repeaters on the ground cooperate to send the encoded signals, enabling the user terminal to realize diversity gain. The simulation results demonstrate that the proposed scheme can provide greatly improved performance. The simulation results in this study show that we can achieve about a 0.8 and 2.3 dB power gain by using the proposed cooperative diversity scheme without and with maximal ratio combining schemes, respectively, compared with the conventional scheme even, with a higher code rate. Copyright (C) 2010 John Wiley & Sons, Ltd.

关键词： space-time block coding turbo codes rate compatible codes mobile satellite systems transmit diversity

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High Rate space-time Codes for Millimeter-Wave Systems with Reconfigurable Antennas

High Rate Space-Time Codes for Millimeter-Wave Systems with ...

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IEEE Wireless Communications and Networking Conference (WCNC)

作者： Vakilian, Vida Mehrpouyan, Hani Hua, Yingbo Univ Calif Riverside Dept Elect Engn Riverside CA 92521 USA Calif State Coll Bakersfield Dept Elect & Comp Engn & Comp Sci Bakersfield CA 93309 USA

ISBN: (纸本)9781479984060

In this paper, we propose a high-rate space-time block code (STBC) for millimeter-wave wireless communication systems that are equipped with reconfigurable multiple input multiple-output (MIMO) antennas. We assume that each reconfigurable antenna element has the capability of forming its beam and can independently change the characteristics of its radiation pattern. We exploit this feature of the antenna elements to construct the proposed space time block code where each coded symbol is sent over independent beams. As a result, the received coded symbols at different receive antennas will have different power levels, a desired property that can be used in data detection. We show that the proposed code achieves a coding rate of two and requires a low-complexity maximum likelihood (ML) detector. We carry out computer simulations that demonstrate the performance of the proposed code and shows its superiority in compared to previous rate-2 STBC counterparts. We also comment on the generalization of the proposed STBC for higher NIINIO dimensions.

关键词： Terms Multiple-input multiple-output (MIMO) recon figurable antennas space-time block coding

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Pre-decorrelation in turbo-coded DS-CDMA system using space-time coding over fading channels

Pre-decorrelation in turbo-coded DS-CDMA system using space-...

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25th National Radio Science Conference

作者： Al-Hosarey, Farid S. Elazm, Atef A. Madkour, Mohamed F. Faculty of Electronic Engineering Menoufia University Egypt Faculty of Engineering Alexandria University Egypt

ISBN: (纸本)9789775031952

In this paper, we deal with the Multiple Access Interference (MAI) suppression problem in Turbo coded space-time block Coded (STBC) Direct Sequence Code-Division Multiple-Access (DS-CDMA) systems. In the proposed system, we preprocess (decorrelate) the coded bits in the transmitter side instead of using a decorrelating detector in the receiver. Using this method, the base station can perform decorrelation before transmissions and the mobile unit uses the conventional receiver achieving approximately the performance of the decorrelating detector. Performance comparison is made between this method and existing decorrelating detector in fading channels. This paper also investigates the performance improvement due to channel coding. Performance comparison between turbo coded STBC DS-CDMA systems employing different interleaver sizes and Soft-Decision Convolutional Codes (SD-CC) is also provided.

关键词： CDMA multi-user detection transmit diversity space-time block coding turbo coding

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Error Performances for a 12-QAM STBC with Two-space Dimensions 9

Error Performances for a 12-QAM STBC with Two-Space Dimensio...

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9th International Conference on Information and Communication Technology Convergence (ICTC)

作者： Lee, Hyun-Hwa Lee, Ji-Hoon Chung, Hae Kumoh Natl Inst Technol Dept Elect Engn Gumi South Korea

ISBN: (纸本)9781538650417

The space-time block coding scheme was developed to reduce the bit error rate for the receiver by transmitting multiple copies of the data during several symbol times. Recently, the 12-QAM scheme with two-time dimensions was proposed to reduce PAPR for the transmitter by removing corner signal points in the constellation. This paper proposes an efficient method to apply the 12-QAM scheme with two-space dimensions including error correction on the constellation to the Alamouti space-time block coding for reliable communications. In the performance results, the error performance of the Alamouti space-time block coding using the proposed QAM is compared with the one using the existing QAM. In addition, it is shown that the performance of 12-QAM with two receiving antennas and error correction on constellation is the best one except 4-QAM with two antennas.

关键词： BER MIMO Multidimensional QAM space-time block coding

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A new interference cancellation arithmetic of space-time coding system

A new interference cancellation arithmetic of space-time cod...

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6th IEEE Circuits and Systems Symposium on Emerging Technologies

作者： Liu, Q Yang, J Li, JD Xidian Univ State Key Lab Integrated Serv Networks Inst Informat Sci Xian 710071 Peoples R China

ISBN: (纸本)0780379381

space-time code is a kind of anti-fading techniques discussed drastically in recent years. The paper focuses on the field of space-time block coding anti-interference technique. After introducing the fundamental concept of interference cancellation and the two-step interference cancellation method used usually, the paper submits a new arithmetic, which is unselective repeated feedback interference cancellation (URF-IC) arithmetic. The arithmetic can achieve the performance of two-step interference cancellation technique while its complexity of operation is lower.

关键词： space-time block coding interference cancellation unselective repeated feedback interference cancellation arithmetic

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Performance Bound Analysis of STBC with Imperfect Multiple Transmit Antennas Selection

Performance Bound Analysis of STBC with Imperfect Multiple T...

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10th International Conference on Communication Technology (ICCT 2006)

作者： Zhuang Mingjie Lin Bihong Jimei Univ Informat Engn Coll Xiamen 361021 Fujian Peoples R China Huaqiao Univ Informat Coll Quanzhou 361021 Fujian Peoples R China Qusnzhou Normal Univ Dept Phys Quanzhou 362000 Fujian Peoples R China

ISBN: (纸本)9781424408009

For a multiple-input-single-output (MISO) communications system, we take the presence of the erroneous channel state information (ECSI) into consideration. Multiple transmit antennas selection (TAS) over NUSO systems with space-time block coding (STBC) (TAS/STBC) is investigated, and a solution over order statistic characteristic of the selective channel with ECSI is proposed. A more accurate analytical expression of Chernoff upper bound (CUB) bit-error rate (BER) for Binary Phase-Shift Keying (BPSK) modulation is derived in flat Rayleigh fading channel. Finally, both CUB BER values and true BER ones with simulation show that TAS technique can improve obviously system transmission performance and mitigate effectively effects of the ECSI.

关键词： transmit antennas selection erroneous channel state information space-time block coding multiple-input and single-output bit-error rate Chernoff upper bound

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Channel Coded STBC-OFDM based Transmit Diversity Systems in Multipath Rayleigh-Fading Channels

Channel Coded STBC-OFDM based Transmit Diversity Systems in ...

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2nd International Conference on Advanced Computing, Networking and Security (ADCONS)

作者： Surendar, M. Muthuchidambaranathan, P. Natl Inst Technol Dept Elect & Commun Engn Tiruchirappalli 620015 Tamil Nadu India

ISBN: (纸本)9780769551272

In this paper, a channel coded space-time block coded orthogonal frequency division multiplexing (STBC-OFDM) system using Alamouti coding scheme is proposed and their performance is compared in terms of bit error rate (BER) with the existing STBC-OFDM system. The system has been investigated using various modulation techniques such as BPSK, QPSK, 16-PSK and 4-QAM. For channel coding technique, the convolutional encoder is used at the transmitter and the Viterbi decoder is used at the receiver. Simulation results shows the advantage of combining the channel coding with the STBC-OFDM system. It is shown that channel coded STBC-OFDM system has a better BER performance over the conventional system. The proposed system achieves a coding gain (CG) of over 6.0 dB in multipath Rayleigh-fading channel.

关键词： Alamouti coding orthogonal frequency-division multiplexing Rayleigh-fading channel space-time block coding transmit diversity

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A blind CM receiver for STBC over channels with inter-symbol interference

A blind CM receiver for STBC over channels with inter-symbol...

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7th IEEE International Symposium on Signal Processing and Information Technology

作者： Bendoukha, Samir Weiss, Stephan Univ Strathclyde Inst Commun & Signal Proc Glasgow G1 1XW Lanark Scotland

ISBN: (纸本)9781424418343

Alamouti's space-time block coding (STBC) scheme has received considerable attention due to its ability to maximize the diversity gain of a Multi-Input-Multi-Output (MIMO) transmission link. For frequency selective fading, only a few receivers can be found in the literature. These are mainly trained and block based, such as time Reversal STBC (TRSTBC), introduced by [3], [4]. In order to ultimately achieve better tracking behavior, this paper focuses on the development or a non-block-based method. The Constant Modulus (CM) criterion is utilized on the received signals with the orthogonality constraint of the transmitted STBC signals. A novel criterion is derived to enforce the STBC structure on the equalizer outputs and consequently minimize the cross-correlation. Simulation results are presented to demonstrate the performance of the proposed algorithm.

关键词： space-time block coding STBC constant modulus criterion blind equalization frequency selective fading orthogonality

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