Coding and system design for quantize-map-and-forward relaying
Coding and system design for quantize-map-and-forward relaying
复制标题
量化映射和转发中继的编码和系统设计
DOI：
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发表时间：
2012
影响因子：
16.4
通讯作者：
B. Nikolić
中科院分区：
文献类型：
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作者：
V. Nagpal;I;M. Jorgovanovic;David Tse;B. Nikolić
在本文中，我们开发了一种基于量化映射转发（QMF）中继方案的半双工中继信道的低复杂度编码方案和系统设计框架。所提出的框架允许在所有网络终端进行线性复杂度操作。我们建议使用二进制 LDPC 码在源端进行编码，并使用 LDGM 码在中继端进行映射。我们将目的地的联合解码表示为因子图上的置信传播算法。该图将 LDPC 和 LDGM 码作为子图，通过对 QMF 中继操作进行建模的概率约束进行连接。我们证明，这种编码框架可以自然地扩展到使用比特交织编码调制（BICM）的高信噪比范围。我们为此因子图开发了密度演化分析工具，并演示了半双工中继通道的实用代码设计，该通道在信息论 QMF 阈值的 1dB 内执行。
In this paper we develop a low-complexity coding scheme and system design framework for the half duplex relay channel based on the Quantize-Map-and-Forward (QMF) relaying scheme. The proposed framework allows linear complexity operations at all network terminals. We propose the use of binary LDPC codes for encoding at the source and LDGM codes for mapping at the relay. We express joint decoding at the destination as a belief propagation algorithm over a factor graph. This graph has the LDPC and LDGM codes as subgraphs connected via probabilistic constraints that model the QMF relay operations. We show that this coding framework extends naturally to the high SNR regime using bit interleaved coded modulation (BICM). We develop density evolution analysis tools for this factor graph and demonstrate the design of practical codes for the half-duplex relay channel that perform within 1dB of information theoretic QMF threshold.