Achievable Rates of the MIMO Multiway Distributed-Relay Channel with Full Data Exchange

Xiang Zhao, Jianwen Zhang, Y. Zhang, Xiaojun Yuan
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Abstract

We consider efficient communications over the multiple-input multiple-output (MIMO) multiway distributed relay channel (MDRC) with full data exchange, where each user, equipped with multiple antennas, broadcasts its message to all the other users via the help of a number of distributive relays. We propose a physical-layer network coding (PNC) based scheme involving linear precoding for channel alignment, nested lattice coding for PNC, and lattice-based precoding for interference mitigation. We show that distributed relaying achieves the same sum-rate as cooperative relaying in the high SNR regime in most scenarios, which implies that the proposed scheme with distributed relays is more suitable for practical systems than the schemes with cooperative relays.
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具有完全数据交换的MIMO多路分布式中继信道的可实现速率
我们考虑在具有完整数据交换的多输入多输出(MIMO)多路分布式中继信道(MDRC)上的高效通信,其中每个用户配备多个天线,通过许多分布式中继的帮助向所有其他用户广播其消息。我们提出了一种基于物理层网络编码(PNC)的方案,包括用于信道对准的线性预编码、用于PNC的嵌套晶格编码和用于干扰缓解的基于晶格的预编码。结果表明,在大多数情况下,分布式中继与协同中继在高信噪比下的和速率相同,这表明分布式中继方案比协同中继方案更适用于实际系统。
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