基于有限反馈的用户协作分集策略

User Cooperative Strategy and Performance Analysis Based on Limited Feedback

基于放大转发和解码转发的协作策略要求用户在协作帧内为协作伙伴转发数据。然而,当基站仅由直接发射的数据就能正确解码用户数据时,在协作帧内为该用户数据的发射则是多余的。为此,结合RCPC码,提出了一种基于基站端有限反馈的用户协作分集策略,用户根据反馈信息自适应调整协作帧内的数据发射。相比于不协作或者传统协作方法,在多种不同场景下的仿真结果均表明,所提出的协作策略不仅极大地提高了用户的性能而且节省了大量的功率和带宽,并提高了用户的吞吐率和频谱效率。

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 pro- posed scheme, the users adaptively change the data transmission in the cooperative frame. The 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.