Soft-output MMSE V-BLAST detector under imperfect channel estimation

With respect to channel coded Multiple-Input Multiple-Output (MIMO) systems, a novel soft-output MMSE V-BLAST detector is derived by considering both the channel estimation error and decision error propagation. Compared with the conventional detection algorithm, simulation results show that proposed scheme can decrease the error floor drastically and obtain significant performance gain at the cost of negligible increased complexity. Furthermore, as proposed scheme is not sensitive to the error of the variance of the estimated channel estimation error, it is desirable for practical applications.