Abstract:

In coded VerticalBell Laboratory Layered SpaceTime (VBLAST) systems, an enhanced Minimum Mean Square Error (EMMSE) based detection algorithm can significantly mitigate error propagation and improve the system performance. However, under quasistatic fading channel condition, its complexity is much higher than that of conventional VBLAST detection algorithm as it requires matrix inversions for almost every symbol in a data block to be detected. To overcome this shortcoming, a simplified detection algorithm is proposed. This algorithm does not need matrix inversions for all symbols to be detected and can also mitigate the error propagation. The complexity of the proposed algorithm is significantly lower compared with that of EMMSE algorithm and is not obvious higher compared with conventional detection approach. Furthermore, simulation results show that the performance of the proposed algorithm is almost the same as that of EMMSE algorithm.

Key words: communication, coded V-BLAST systems, MMSE, error propagation, bit LLR