Error Aware Distributed Space-Time Decoding for Regenerative Relay Networks

Abstract—In this paper, we examine distributed space-time decoding structure for regenerative wireless relay networks. Given the demodulation error at the regenerative relays, we provide a general framework of error aware distributed space-time decoding at the destination, where the receiver is assumed to know the demodulation error probability at relays. Consid-ering the high computational complexity of optimal Maximum Likelihood (ML) decoder, we also propose two low-complexity decoding structures, Max-Log decoder and Max-Log-Sphere decoder. Simulations show that error aware distributed space-time decoding can improve system performance greatly without high system overload, and Max-Log decoder and Max-Log-Sphere decoder can efficiently reduce decoding complexity with neglectable performance degradation. I