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Iterative cyclic prefix reconstruction and channel estimation for a STBC OFDM system

IEEE COMMUNICATIONS LETTERS 2005年第4期9卷 307-309页

作者： Won, HC Im, GH POSTECH Dept Elect & Elect Engn Pohang 790784 South Korea

In order to prevent a loss of spectral efficiency due to the use of a cyclic prefix (CP), a CP reconstruction (CPR) method, such as residual intersymbol interference cancellation (RISIC), has recently been developed. In this letter, we apply the RISIC method to an Alamouti space-time block coded (STBC) orthogonal frequency division multiplexing (OFDM) system with insufficient CP. It is shown that in the STBC OFDM, tail cancellation as well as cyclic restoration of the RISIC should be repeated. An iterative channel estimation method for the STBC OFDM system with CPR is proposed. The performance of the proposed method is evaluated by computer simulation in a multipath fading environment.

关键词： orthogonal frequency division multiplexing space-time block code channel estimation cyclic prefix reconstruction

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space time block decoding in time-variant channels

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IEICE TRANSACTIONS ON COMMUNICATIONS 2005年第1期E88B卷 408-410页

作者： Kim, JW Jeon, WG Univ Texas Dept Elect & Comp Engn Wireless Networking & Commun Grp Austin TX 78712 USA Korea Elect Technol Inst Adv Media Commun Res Ctr Kyunggido South Korea

This letter proposes a quadratic optimization decoding (QOD) for space-time block decoding in time-selective Rayleigh fading channels. When channels are fast fading, the simple decoding exploiting the orthogonal structure of the codes can not be used to achieve a proper error performance. In an effort to mitigate the severe performance degradation, in this letter least square decoding and QOD are considered for decoding. Simulation results show that the QOD shows a significant performance improvement compared to the least square and the conventional schemes.

关键词： space-time block code MIMO transmit diversity fast fading

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Performance of MIMO systems with combined polarization multiplexing and transmit diversity

Performance of MIMO systems with combined polarization multi...

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61st IEEE Vehicular Technology Conference

作者： Deng, Y Burr, A White, G Univ York Dept Elect York YO10 5DD N Yorkshire England

ISBN: (纸本)0780388879

Spatial multiplexing and space-time block codes are promising techniques that effectively exploit mulitple-input multiple-output (MIMO) transmission to achieve a higher data rate and more reliable communication, respectively. On the other hand, the use of dual-polarized antennas in MIMO systems has emerged as a cost- and space-effective alternative, where two spatially separated uni-polarized antennas can be replaced by a single antenna element employing orthogonal polarizations. In this paper, we investigate the use of dual-polarized antennas in a combined spatial multiplexing and space-time block coded system. We present a hybrid transmission scheme that employs transmit diversity over the same polarization of the two transmit dual-polarized antennas and transmits the co-channel space-time coded signals on the orthogonal polarizations. We evaluate the system performance for both the Rayleigh fading channel and the suburban environment of a personal communication system (PCS) at 1800 MHz. It is shown that the performance of PM-STBC approaches that of STBC in the correlated Ricean fading environment and it saves one receive antenna.

关键词： MIMO space-time block code spatial multiplexing transmit diversity polarization diversity

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Optimal eigen-beamforming combined with orthogonal STBC and TCM in correlation fading channels

Optimal eigen-beamforming combined with orthogonal STBC and ...

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International Conference on Wireless Communications, Networking and Mobile Computing

作者： Jin, J Wang, JF Zhu, GX Huazhong Univ Sci & Technol Dept Elect & Informat Wuhan 430074 Peoples R China

ISBN: (纸本)078039335X

This paper develops a novel system which combines the two dimensional (2D) eigen-beamforming (EBF) with orthogonal space-time block code (O-STBC) and trellis coded modulation (TCM) for transmit correlation fading channels. The corresponding statistic error event probability analytical expressions, power load algorithms and TCM design criteria are achieved respectively for two cases: with or without interleaver. The former achieves build-in-time diversity besides beamforming diversity and code gain from product-stun distance, and which requires channel correlations to keep constant over the interleaving length. The latter obtains beamforming diversity and code gain from free distance. The power allocation algorithms show a new feature that relates to code distance other than minimum Euclidian distance among constellation points, which can lows the threshold of achieving beamforming diversity. The conventional 1D beamforming is proved to be a special case. Furthmore, the analysis and simulation results show the proposed system can offer good performance with low decode complexity and has no space-time code rate lost with random number of transmit antennas.

关键词： build-in-time diversity correlation channel beamforming diversity interleaver space-time block code power load trellis-coded modulation

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A full-rate complex orthogonal space-time block coding scheme for multiple antennas

A full-rate complex orthogonal space-time block coding schem...

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International Symposium on Communications and Information Technologies (ISCIT2005)

作者： Yu, XB Xu, WY Xu, DZ Bi, GG Nanjing Univ Aeronaut & Astronaut Coll Informat Sci & Technol Nanjing 210016 Peoples R China

ISBN: (纸本)0780395387

In this paper, a full-rate complex orthogonal space-time block (STB) coding scheme for multiple antennas in time division duplex (TDD) mode is proposed. Meanwhile, we employ turbo code as channel coding to improve the performance of proposed STB code further by utilizing its soft decision information from multiple iterations decoding, random interleaver and good ability to combat the burst error of fading channel. Compared with full-diversity multiple antennas STB code schemes, the proposed code scheme can implement full rate, partial diversity and a smaller complexity. On the condition of same system throughput and concatenation of turbo code, the code has lower bit error rate (BER) than those low-rate and full-diversity codes.

关键词： space-time block code turbo coding full rate multiple antennas transmit diversity

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Multi-stage SIC multiuser detection for MIMO non-orthogonal STBC systems

Multi-stage SIC multiuser detection for MIMO non-orthogonal ...

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47th International Symposium ELMAR-2005 on Multimedia Systems and Applications

作者： Sun, LP Bi, GA Zhang, LR Nanyang Technol Univ Sch EEE Singapore 639798 Singapore

ISBN: (纸本)9537044041

Successive interference cancellation (SIC) multiuser detector is one of the computationally efficient sub-optimal multiuser detection methods, this paper attempts to apply the multi-stage SIC concept to full rate non-orthogonal space-time block coded (NOSTBC) multiple-input multiple-output (MIMO) systems. With 4 transmitting antennas and p, wherep = 1, 2, 3 and 4, receiving antennas, the multi-stage SIC multiuser detector is able to make substantially improvement on bit-error-rate (BER) performance and system capacity compared to the decorrelating detectors for different antenna configurations in Rayleigh fading channel.

关键词： multiuser detection MIMO space-time block code successive interference cancellation

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Performance of STBC-MC-CDMA system based on complex wavelet packet and turbo coding

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Journal of Southeast University(English Edition) 2005年第4期21卷 398-404页

作者：虞湘宾毕光国南京航空航天大学信息与通信工程博士后流动站南京210016 东南大学移动通信国家重点实验室南京210096

On the basis of analyzing the principle of the space-time coding technique and the multi-carrier code division multiple access （MC-CDMA） technique, adopting the turbo codes as channel coding and the optimized complex wavelet packet as multi-carrier modulation, a novel space-time block coded the MC-CDMA system based on complex wavelet packet and turbo coding is proposed, and the system bit error rate （BER） performance in the Rayleigh fading channel is investigated. The system can make full use of space-time block codes＇ transmit diversity and turbo codes＇ good ability against fading channel to improve the BER performance significantly, and it can also avoid the decrease of spectrum efficiency of conventional MC-CDMA due to inserting cyclic prefix （CP） by utilizing superior characteristics of the optimized complex wavelet packet. Simulation results show that the proposed space-time block coded MC-CDMA system based on the complex wavelet packet performs better than the conventional space-time block coded MC-CDMA （STBC-MC-CDMA） system, and slightly outperforms the STBC-MC-CDMA with CP. Moreover, the application of the space-time block coding technique concatenated with turbo codes strengthens the system ability to combat various interferences in fading channel further.

关键词： multi-carrier technique complex wavelet packet space-time block code code division multiple access turbo coding

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space-time block codes Based on Quasi-Orthogonal Designs

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Journal of Donghua University(English Edition) 2004年第4期21卷 4-7页

作者：李正权胡光锐单红梅 Department of Electronics and Communications Yangzhou University Yangzhou 225009Dr Department of Electronics and Communications Yangzhou University Yangzhou 225009 School of electronics and Information Shanghai Jiaotong University Shanghai 200030

A new space-time block codes based on quasi-orthogonal designs are put forward. First the channel model is formulated. Then the connection between orthogonal /quasi-orthogonal designs and space-time block codes is explored. Finally we make simulations for the transmission of 4 bits/s/Hz and 6 bits/s/Hz using eight transmit antennas using the rate 3/4 quasi-orthogonal space-time block code and the rate 1/2 full-diversity orthogonal space-time block code. Simulation results show that full transmission rate is more important for very low signal noise ratio (SNR) and high bit error probability (BEP), while full diversity is more important for very high SNR and low BEP.

关键词： space-time block code orthogonal design quasi-orthogonal.

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Optimal Eigen-beamforming Combined with Orthogonal STBC and TCM in Correlation Fading Channels

Optimal Eigen-beamforming Combined with Orthogonal STBC and ...

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2005年无线通信、网络和移动计算国际会议

作者： Jiang Jin Junfang Wang Guangxi Zhu Department of Electronic and Information Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)078039335X

This paper develops a novel system which combines the two dimensional (2D) eigen-beamforming (EBF) with orthogonal space-time block code (O-STBC) and trellis coded modulation (TCM) for transmit correlation fading channels. The corresponding statistic error event probability analytical expressions, power load algorithms and TCM design criteria are achieved respectively for two cases: with or without interleaver. The former achieves build-in-time diversity besides beamforming diversity and code gain from product-sum distance, and which requires channel correlations to keep constant over the interleaving length. The latter obtains beamforming diversity and code gain from free distance. The power allocation algorithms show a new feature that relates to code distance other than minimum Euclidian distance among constellation points, which can lows the threshold of achieving beamforming diversity. The conventional 1D beamforming is proved to be a special case. Furthmore, the analysis and simulation results show the proposed system can offer good performance with low decode complexity and has no space-time code rate lost with random number of transmit antennas.

关键词： Build-in-time diversity correlation channel beamforming diversity interleaver space-time block code power load trellis-coded modulation

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Differential modulation based on space-time block codes

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Journal of Systems Engineering and Electronics 2004年第3期15卷 407-412页

作者：李正权胡光锐 DepartmentofElectronicsandCommunicationsYangzhouUniversity Yangzhou225009P.R.China DepartmentofElectronicsandInformationShanghaiJiaotongUniversity Shanghai200030P.R.China

A differential modulation scheme using space-time block codes is put forward. Compared with other schemes, our scheme has lower computational complexity and has a simpler decoder. In the case of three or four transmitter antennas, our scheme has a higher rate a higher coding gain and a lower bit error rate for a given rate. Then we made simulations for space-time block codes as well as group codes in the case of two, three, four and five transmit antennas. The simulations prove that using two transmit antennas, one receive antenna and code rate of 4 bits/s/Hz, the differential STBC method outperform the differential group codes method by 4 dB. Useing three, four and five transmit antennas, one receive antenna, and code rate of 3 bits/s/Hz are adopted, the differential STBC method outperform the differential group codes method by 5 dB, 6. 5 dB and 7 dB, respectively. In other words, the differential modulation scheme based on space-time block code is better than the corresponding differential modulation scheme

关键词： space-time block code coding gain differential modulation bit error rate.

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