[论文]宽带无线通信中的MIMO系统

宽带无线通信中的MIMO系统 r~sQdf  
付卫红，杨小牛，刘乃安，曾兴雯 |r/4 ({n  
(西安电子科技大学ISN国家重点实验室  西安  710071) i]IZ0.?Y  
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【摘要】介绍了多入多出系统中的空时 OFDM技术与MIMO系统相结合，研究了 *h2)$^P%  
STBC-OFDM SFBC-OFDM及VBLAST-OFDM系统。对该系统性能进行了分析和仿真，结果表 VBLAST系统传输速率最高， /@9-D 4  
其速率至少是分组码MIMO-OFDM系统的2倍，但是其误码性能相对较差，误码率为0.001时，VBLAST-OFDM系统所需的信 qj<_*  
噪比比分组码系统要高9.3 dB  "uD^1'IW2  
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MIMO Systems in Wideband Wireless uDG#L6  
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FU Wei-hong，YANG Xiao-niu，LIU Nai-an，ZENG Xing-wen 8\rHSsP  
(State Key Lab. of Integrated Service Networks, Xidian University  Xi’an  710071) S@vLh=65  
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Abstract  This paper introduces the space-time coding and the space-frequency coding technologies of a =xPBolxm5U  
Multi-Input and Multi-Output(MIMO) system. We combine the Orthogonal Frequency divided Multiplex (OFDM) z=a{;1A  
with MIMO system and research on several MIMO-OFDM systems, for example, Space-Time Block Coding 'fIirGOl  
(STBC) OFDM system, Space-Frequency Block Coding(SFBC) OFDM system, and Vertical Bell Laboratories :a y-2  
Layered Space Time (VBLAST)-OFDM system. Analysis and simulation of these MIMO-OFDM systems’ >@StKj  
performance are examined. The results show that the data rate of the VBLAST-OFDM system is the highest, which >T
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is at least the twice as high as that of the STBC-OFDM or SFBC-OFDM system. However Bit Error Rate(BER) =@go;,"  
performance of the VBLAST-OFDM system is worse than that of the others. When BER is equal to 0.001, the &g
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required signal-noise ratio for VBLAST-OFDM system is 9.3dB more than that for the STBC or SFBC and OFDM `+EjmY  
system. On the other hand, the complexity of the VBLAST-OFDM system is higher than that of the STBC or SFBC J2Eb"y>/;  
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