摘要
在多用户协同中继系统中,受共信道干扰的影响,系统性能下降严重。提出了一种融合多源信号空间对齐和网络编码的方案,每个用户通过中继向其他的用户发送不同的信息,同时也通过中继接收其他用户的不同信息。整个过程可分为多址接入信道(MAC)和广播信道(BC)两个阶段。在MAC阶段,利用信号空间对齐技术在中继形成较少的信息量、抑制多用户干扰。在BC阶段,通过中继的网络编码,设计简单的预编码算法,有效降低了用户译码的复杂度。整个系统的完成只需要两个时隙,能有效地抑制干扰和提高系统自由度。
In muhi-user cooperative relay system, system performance degrades seriously by the co-channel influence of interference. In this article, a joint of muhi-source signal space alignment and network coding scheme are proposed that each user send different messages to the other users via the relay＇, while receiving independent information from any other users. The whole process can be divided into two pha^s of the multiple access channel （MAC） and broadcast channel （BC）. in the MAC stage, the signal space alignment is used to form a smaller amount of information in the relay, suppressing multi-user interference. In the BC stage, designing simple precoding algorithm, it can reduce the decoding complexity of the users through the relay network coding. The completion of the entire system requires only two time slots, which can effectively suppress interference and increase system degrees of freedom.
出处
《电视技术》
北大核心
2014年第9期126-128,201,共4页
Video Engineering
关键词
双向中继信道
信号空间对齐
网络编码
two-way relay channel
signal space alignment
network coding
