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Capacity Analysis for the Gaussian Two-Pair Two-Way Relay Channel

机译:高斯双对双向继电器通道的容量分析

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This paper studies the transceiver design of the Gaussian two-pair two-way relay channel (TWRC), where two pairs of users exchange information through a common relay in a pairwise manner. Our main contribution is to show that our scheme can achieve the capacity of the two-pair TWRC to within 1/2 bit per user. In the proof, we develop a hybrid coding scheme involving Gaussian random coding, nested lattice coding, superposition coding, and network-coded decoding. Further, we present a message-reassembling strategy to decouple the coding design for the user-to-relay and relay-to-user links, so as to provide more flexibility to fully exploit the channel randomness. We also show that judicious power allocation among the superimposed codeword components at the relay is needed to approach the channel capacity.
机译:本文研究了高斯双对继电器通道(TWRC)的收发器设计,其中两对用户以一对方式通过公共继电器交换信息。我们的主要贡献是表明我们的计划可以在每个用户的1/2位内实现双对TWRC的容量。在证明中,我们开发了一种混合编码方案,涉及高斯随机编码,嵌套晶格编码,叠加编码和网络编码解码。此外,我们提出了一种消息重新组装策略,用于将用户到中继和中继用户链接分离的编码设计,以便提供更灵活性以完全利用信道随机性。我们还表明需要在继电器处的叠加码字组件中的明智功率分配来接近信道容量。

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