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

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.