Iterative Interference Cancellation Algorithms for the V-BLAST System

Abstract

We propose efficient iterative interference cancellation algorithms for the vertical Bell Laboratories layered space-time (V-BLAST) system. Proposed schemes consist of conventional successive interference cancellation based on the QR decomposition (SIC-QR) and diversity combining techniques such as maximal-ratio combining or selection combining. We develop upper bounds of the SIC-QR and proposed schemes. Significant performance improvement is obtained by increasing diversity order of each stream and alleviating the effect of error propagation. In particular the proposed schemes can accomplish significant performance advantage over the ordered SIC (OSIC) in small numbers of antennas system. In addition, we compare the complexity of proposed schemes with the SIC-QR and previously reported OSIC algorithms. Proposed schemes require slightly increased complexity, when compared to the SIC-QR. It is also shown that additional computations could be reduced by controlling iteration numbers.