异步V-BLAST中基于功率扩展的迭代并行干扰消除  

Power Spreading Based Iterative Parallel Interference Cancellation in Asynchronous V-BLAST

作　　者：莫韬甫[1] 邵士海[1] 刘田[1] 唐友喜[1] 

机构地区：[1]电子科技大学通信抗干扰技术国家级重点实验室,成都611731

出　　处：《电子与信息学报》2012年第5期1196-1201,共6页Journal of Electronics & Information Technology

基　　金：国家863计划项目(2009AA01Z236);国家自然科学基金(60902027;60832007;60901018);中央高校基金(ZYGX2010J012;ZYGX2009J008;ZYGX2009J010)资助课题

摘　　要：在平坦瑞利衰落信道下,异步V-BLAST系统中,现有检测算法随信噪比提高误码率性能改善缓慢。为此,该文提出一种基于预处理矩阵的迭代检测算法:在发射端,通过预处理矩阵将发射信号扩展到整个数据帧上,以获取空时分集度;在接收端,采用低复杂的迭代并行干扰消除方法,由于在迭代过程中干扰重建基于预处理矩阵,所以上次迭代的检测误差被扩展,降低了迭代过程中的误差传播。仿真验证了所提方法的有效性,在8发4收场景下,误码率为10-3时,与现有串行干扰消除方法相比,带来了约7 dB信噪比增益。In asynchronous Vertical Bell Laboratories Layered Space-Time（V-BLAST） over the nonselective Rayleigh fading channel,the performance of the existing detection algorithms improve slowly as the SNR increasing.In this paper,an iterative Parallel Interference Cancellation（PIC） algorithm based on pre-processing matrix is proposed： the transmitted signal is spread by pre-processing matrix in transmitter to achieve the space-time diversity gain,and low complexity iterative PIC algorithm is used in receiver,which relieves the error propagation by the pre-processing matrix.The performance improvement is verified by simulation.Under the condition of 8 transmit antennas and 4 receive antennas at the BER of 10-3,about 7 dB gain is offered by proposed algorithm compared with traditional ordered successive interference cancellation algorithm.

关 键 词：无线通信 功率扩展 异步V-BLAST 迭代 并行干扰消除 

分 类 号：TN92[电子电信—通信与信息系统]