A Two-stage Iterative Successive Detection Algorithm for V-BLAST Code

V-BLAST (Vertical Bell Lab Layered Space-time) is an attracting space-time code structure because it can get significantly higher capacity than SISO system in Rayleigh fading environments. To optimize BER, computational complexity, time delay or other targets, many different detection algorithms are proposed in recent years. In this paper, we proposed a two-stage detection algorithm for V-BLAST, in the first stage, conventional algorithm such as ZF, MMSE is used; in the second stage, based on the detection result of the front stage, we adopt an iterative successive symbol cancellation algorithm to obtain better BER performance at a little cost. The effect of iterations and different cancellation order are also analyzed in our paper. Furthermore, we adopt partial successive symbol cancellation in our structure to avoid error propagation