STBC和VBLAST相結(jié)合的MIMO系統(tǒng)
MIMO System Combining Space-Time Block Codes and VBLAST
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摘要: STBC編碼是基于發(fā)端分集的傳輸方案,VBLAST是基于空間復(fù)用的傳輸方案;基于兩種方案的MIMO 系統(tǒng),在空間相關(guān)信道下系統(tǒng)的性能都會下降,但前者的性能會明顯好于后者;該文提出一種折衷方案,將發(fā)射天線陣列分組,每組內(nèi)采用STBC編碼,接收端采用VBLAST算法。仿真結(jié)果表明:在空間相關(guān)信道下,該方案的誤碼率性能明顯優(yōu)于通常的VBLAST接收機。
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關(guān)鍵詞:
- STBC; VBLAST; 多入多出（MIMO）; 信道相關(guān)性
Abstract: Space-Time Block Codes (STBC) is a scheme based on diversity-oriented transmission while VBLAST is another scheme based on spatial multiplexing; The performances of the two different MIMO systems are both degraded in correlated channels, however the performance of the former is better than the later. This paper proposes a trade-off scheme that the transmit antennas are divided into group meantime space-time block codes are applied to the different groups, VBLAST algorithm is used in the receiver. Simulation results show that performance of proposed scheme greatly gains over the VBLAST. -
Wolniansky P W, foschini G J, Golden G D, et al.. V- BLAST: an architecture for realizing very high data rates over the rich-scattering vireless channel. IEEE ISSSE, USA, IEEE press,1998:230 - 235.[2]Foschin G J. Layered space-time architecture for wireless communication in a fading environment when using multiple antennas. Bell Labs Technical Jurnal, 1966, 1 (2): 41 - 59.[3]Bolcskei H, Paulraj A. Performance of space-time in the presence of spatial fading correlation [C]. Asilomar Conf. on Signals, Systems, and Computers, Pacific Grove, CA, Oct. 2000, (invited paper), Vol. 1,687 - 693.[4]Haas H, Costa E, Filippi A, et al.. The impact of channel correlation on space-time block codes for different modulation schemes. VTC2002-Fall. 2002 IEEE 56th, Vancouver, Canada,2002, Vol.3.[5]Wang Zhongpeng, Wu Weiling. Performance of space- time block code based on spatial correlated MIMO channels FTC2003,Beijing, 2003:417 - 421.[6]Choi Won-Joon.[J].Cloffi J. Space-time block codes over frequency selective Rayleigh fading channels. VTC99, IEEE VTS 50th ,Vol.5, Amsterdam, the Nether lands.1999,:- -
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