双簇多路中继信道的信号空间对准和自由度

Ye Tian, A. Yener
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引用次数: 11

摘要

本文研究了多路中继信道的自由度。具体地说,重点放在有两个集群并且每个集群有两个希望在中继的帮助下在集群内交换消息的用户的情况下。假设中继有N个天线,每个用户有M个天线。推导出了一个自由度外界,并证明了对于一些感兴趣的场景,自由度外界是可以实现的。具体来说,当N≤M时,采用基于网络编码的时分多址(TDMA)双向中继方式就足以实现外界DoF。当M <;N≤4/3M时,信号空间对准,集群间多址广播传输,可实现外置DoF。研究还表明,当N≥4M时,仅通过用户间的多址和广播传输即可实现外界DoF。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Signal space alignment and degrees of freedom for the two-cluster multi-way relay channel
This paper investigates the degrees of freedom (DoF) of the multi-way relay channel. Specifically, the focus is on the case when there are two clusters and each cluster has two users that wish to exchange messages within the cluster with the help of the relay. It is assumed that the relay has N antennas and each of the users has M antennas. A DoF outerbound is derived and it is shown that for several scenarios of interests the DoF outerbound can be achieved. Specifically, when N ≤ M, a network coding based two-way relaying approach with time division multiplex access (TDMA) is sufficient to achieve the DoF outerbound. When M <; N ≤ 4/3M, the signal space alignment with multiple access and broadcast transmission between the clusters can achieve the DoF outerbound. It is also show that when N ≥ 4M, the DoF outerbound can be achieved by just using multiple access and broadcast transmission between the users.
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