一种基于矩阵旋转的正交空时分组码

王磊; 朱世华; 王君

一种基于矩阵旋转的正交空时分组码

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出版历程
- 收稿日期: 2003-10-09
- 修回日期: 2004-04-26
- 刊出日期: 2005-03-19

An Orthogonal Space-Time Block Code Based on Matrix Rotation

摘要

摘要: Tarokh等人(1999)运用正交设计理论证明了当发射天线数大于2时,不存在可以获得最大分集增益和最大传输速率的复正交空时分组码。而以牺牲正交性和部分分集增益为代价来获得更高传输速率的非正交空时分组码又会使误码性能降低。该文通过对非正交空时分组码信道相关矩阵采用矩阵旋转的方法,提出了一种可以获得最大传输速率、部分分集增益以及接收端线性解码的正交空时分组码。仿真结果表明,该方案与已有典型的空时分组码相比,具有较好的误码性能。
- 分集; 多天线; 空时分组码; 无线通信
Abstract: According to the theory of orthogonal designs, Tarokh et al.(1999) proved that a complex orthogonal space-time block code that provides full diversity and full transmission rate is not feasible for more than two antennas. Whereas the non-orthogonal space-time block codes which obtain higher transmission rate at the cost of orthogonality and partial diversity gain may degrade the performance. By rotating the channel correlation matrix of the non-orthogonal space-time block code, this paper proposes an orthogonal rate-one space-time block code which provides partial diversity but can be linearly decoded at the receiver. Simulation results show that the scheme has better Bit Error Rate (BER.) performance compared to the existing typical codes.

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Tarokh V, Seshadri N, Calderbank A R. Space-time codes for high data rate wireless communication: Performance analysis and code construction[J].IEEE Trans. on Info. Theory.1998, 44(2):744-765[2]Alamouti S M. A simple transmitter diversity scheme for wireless communications[J].IEEE J. on Select. Areas Comm.1998, 16(8):1451-[3]Tarokh V, Jafarkhani H, Calderbank A R. Space-time block codes from orthogonal designs[J].IEEE Trans. on Info. Theory.1999,45(5):1456-[4]Tarokh V, Jafarkhani H, Calderbank A R. Space-time block coding for wireless communications: Performance results[J].IEEE J.on Select. Areas Comm.1999, 17(3):451-[5]Tirkkonen O, Boariu A, Hottinen A. Minimal non-orthogonality rate 1 space-time block code for 3+Tx[J].International Symposium on Spread Spectrum Techniques Applications, New Jersey,USA, Sept.2000, 2:429-[6]Jafarkhani H. A quasi-orthogonal space-time block code[J].IEEE Trans. on Comm.2001, 49(1):1-[7]Boariu A, Ionescu D M. A class of nonorthogonal rate-one space-time block codes with controlled interference[J].IEEE Trans.on Wireless Comm.2003, 2(2):270-[8]Papadias C B, Foschini G J. A space-time coding approach for systems employing four transmit antennas. IEEE International Conference on Acoustics, Speech and Signal Processing, Salt Lake City, Utah, USA, May 2001, 4:2481 - 2484.[9]Rouquette S, Merigeault S, Gosse K. Orthogonal full diversity space-time block coding based on transmit channel state information for 4 Tx antennas. IEEE International Conference on Communications, New York City, USA, May 2002, 1:558- 562.[10]张贤达.信号处理中的线性代数.北京:科学出版社,1997:64.

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