Parallel Detection Algorithm with Selective Interference Cancellation for V-BLAST Systems

Maximum-likelihood detection (MLD) is the optimal scheme for vertical Bell Laboratories layered space-time (V-BLAST) systems. However, due to its exponentially high complexity, many alternative algorithms, including some parallel detection (PD) ones with low complexity and high stability, have been proposed instead for practical applications. Nevertheless, the existing PD algorithms are unable to exploit sufficiently the diversity order increment for low-complexity algorithms via exhaustive interference cancellation (EIC) and the complexity of the sub-detectors is still undesirably high. In this paper, a novel PD algorithm with relative low-complexity sub-detectors, i.e., the selective-interference-cancellation sub-detectors, has been developed. The algorithm is abbreviated as PDSIC algorithm. Numerical analysis indicates that the PDSIC algorithm can achieve the near-optimal performance with much lower complexity in comparison with the existing PD algorithms. Thus, the PDSIC algorithm makes the parallel detection more feasible in practical systems with limited parallel processing elements.