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.%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.
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