Viterbi Algorithm Based Noncoherent Detection Scheme for Differential Space-Time Block Code

Abstract

The Viterbi algorithm based noncoherent detection schemes are considered for the detection of differential space-time block code in fast fading environments. In order to overcome the channel variation due to fading, we consider exploiting short observation interval and applying the Viterbi algorithm to mitigate the performance degradation due to this short interval. Our simulation results shows that the proposed detection scheme outperforms not only multiple symbol differential detection but also coherent detection with channel estimation under fast fading conditions. In addition, we easily extend the proposed detection scheme to an iterative version by simply incorporating a priori information from the channel decoder. It is also shown that this iterative method improves the performance as the number of iterations increases.