In advance radio communication, cooperative communication introduces a new method of collectively transmit information using antenna array with each terminal having single antenna in order to exploit spatial diversity in wireless fading channels. In this monograph the performance of important transmission protocols, amplify-forward, decode- forward and adaptive decode-forward in terms of symbol error rate have been demonstrated. In relay networks, specifically ad hoc or cellular networks user via cooperation enhances the quality of wireless communications link. In case of multiple...