Precoding and Distributed STBC for Asynchronous Cooperative Diversity

For mobile users without antenna arrays, transmission diversity can be achieved with cooperative space-time encoded transmissions. In this paper, a new precoding frame-based scheme with packet-wise encoding is proposed. This precoding is based on the addition of a cyclic prefix, which is overhead, so we put more information in it by implementing this cyclic prefix as a training sequence. This scheme offers us additional known symbols and enables better synchronization and (potentially) channel estimation.