一种新型的多址接入中继协作方案

现有多址中继协作方案的编码增益有限且用户之间不能相互辅助,为此,文中提出了一种结合网络与信道编码的多址中继协作方案:在中继端利用网络编码将不同用户的编码冗余同时转发,目的端通过对某个用户信息的正确译码恢复出其他用户的编码冗余.通过对译码错误事件概率的分析,推导了该方案的中断率与误码率近似值表达式.仿真结果表明,随着信噪比的提升,文中方案可获得比编码协作更好的中断率和误码率性能,同时信噪比较高的用户还可辅助提升信噪比较低的用户的性能.

A Novel Cooperative Scheme for Multiple-Access Relay Channel

As for the conventional multiple-access relay cooperation scheme, the coding gain is limited and users cannot assist each other. In order to solve these problems, a novel cooperative scheme based on network and channel coding is proposed. In this scheme, the coding redundancy of different users is simultaneously forwarded through network coding at the relay node, and, once the codes of one user are correctly decoded at the destination, the coding redundancy of other users can be retrieved. The approximations of outage probability and bit error rate of the proposed scheme are then deduced by analyzing the error event probability. Simulation results show that the proposed scheme is of better performance than the coded cooperation scheme in terms of outage probability and bit error rate when the signal to noise ratio (SNR) is getting higher, and that the performance of the user with low SNR can be improved with the help of the user with high SNR.