Abstract: The cooperative schemes based on amplify-and-forward and decode-and-forward involve the user forward partner's data in the cooperative frame. However, it seems a waste of power and bandwidth when the based station can recover the user's data only based on the direction transmission. Thus, we proposed a new cooperative strategy, which is based on limited feedback from the base station and employed RCPC codes for its implementation. Based on our proposed scheme, the users adaptively change the data transmission in the cooperative frame. I}he simulation results reveal that our proposed scheme achieves impressive gains in contrast with non-cooperative system and also outperforms existing cooperative schemes while not only saving considerable power and bandwidth but also improving the throughput and spectral efficiency under various inter-user and uplink channel conditions.

Key words: Cooperative diversity, Amplify-and-forward, Decodcand-forward, Coded cooperation, Limited feedback, User cooperation