Equalization for symmetric cooperative relay scheme for wireless communications

Abstract

Cooperative relaying methods have attracted a lot of interest in the past several years. A conventional cooperative relaying scheme has a source, a destination and a single relay. This cooperative technique can support one symbol transmission per time slot, called full rate transmission. However, existing full rate cooperative relay approaches have asymmetrical diversity gains for different symbols. Another approach is to use dual relays to overcome these effects. In this paper, we propose the design of equalizers for the cooperative relaying scheme that is assisted with dual relays providing full transmission rate and same macro-diversity to each symbol. The equalization of received symbols is carried out using a minimum mean squared error (MMSE) linear equalizer (LE) and decision feedback equalizer (DFE) which provide inter-symbol-interference (ISI) cancellation capabilities.