Multi-level compress and forward coding for half-duplex relays
Multi-level compress and forward coding for half-duplex relays
复制标题
半双工中继的多级压缩和前向编码
DOI：
10.1109/glocom.2012.6503833
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Saad B. Qaisar
中科院分区：
文献类型：
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作者：
Jaweria Amjad;M. Uppal;Saad B. Qaisar
本文提出了一种三节点中继网络的多级压缩和前向编码方案，其中所有传输都被限制为来自 M 元 PAM 星座。所提出的框架采用统一标量量化器，然后在中继处采用 Slepian-Wolf 编码。我们首先通过推导相应的信息理论可实现率来获得所提出方案的性能基准。然后讨论涉及多级码的实用编码方案。在源节点，我们使用多级低密度奇偶校验码进行错误保护。在中继节点，我们提出了一种多级分布式联合源信道编码方案，该方案使用不规则的重复累积码，其速率是使用熵链规则仔细选择的。对于 2×105 个符号的块长度，所提出的方案在传输速率为 1.0 和 1.5 位/样本时分别在理论极限的 0.56 和 0.63 dB 范围内运行。
This paper presents a multi-level compress and forward coding scheme for a three-node relay network in which all transmissions are constrained to be from an M-ary PAM constellation. The proposed framework employs a uniform scalar quantizer followed by Slepian-Wolf coding at the relay. We first obtain a performance benchmark for the proposed scheme by deriving the corresponding information theoretical achievable rate. A practical coding scheme involving multi-level codes is then discussed. At the source node, we use multi-level low-density parity-check codes for error protection. At the relay node, we propose a multi-level distributed joint source-channel coding scheme that uses irregular repeat-accumulate codes, the rates of which are carefully chosen using the chain rule of entropy. For a block length of 2×105 symbols, the proposed scheme operates within 0.56 and 0.63 dB of the theoretical limits at transmission rates of 1.0 and 1.5 bits/sample, respectively.