Quantize-map-and-forward relaying: Coding and system design
Quantize-map-and-forward relaying: Coding and system design
复制标题
量化映射和转发中继：编码和系统设计
DOI：
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发表时间：
2010
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通讯作者：
B. Nikolić
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文献类型：
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作者：
V. Nagpal;I;M. Jorgovanovic;David Tse;B. Nikolić
量化映射转发 (QMF) 是一种中继方案，已被证明可以在恒定间隙内实现高斯中继网络的容量。在 QMF 下，中继转发的压缩索引不会被显式解码。相反，消息与压缩索引一起被解码。在这项工作中，我们提出了一个实用的编码和信令框架来捕获 QMF 的这一方面。我们概述了具有单个半双工中继的简单高斯网络的框架。我们提出了一种方案，其中二进制 LDPC 码用于在源和中继处进行编码。为了选择合适的代码和量化器，我们表明 QMF 的联合解码操作可以简化为 Tanner 图上的置信传播。给出的仿真结果证明了所提出的编码方案的合理性。所提出的框架可以扩展用于高阶信号星座。
Quantize-map-and-forward (QMF) is a relaying scheme that has been shown to achieve the capacity of Gaussian relay networks to within a constant gap. Under QMF the compression indices forwarded by relays are not decoded explicitly. Instead, the message is decoded jointly with the compression indices. In this work we present a practical coding and signaling framework that captures this aspect of QMF. We outline the framework for a simple Gaussian network with a single half-duplex relay. We propose a scheme where binary LDPC codes are used for encoding at the source and at the relay. For suitable choice of codes and quantizer we show that the joint decoding operation for QMF can be reduced to belief propagation over a Tanner graph. Simulation results are given to justify the proposed coding scheme. The proposed framework can be extended for use with high order signal constellations.