Design of Distributed Protograph LDPC Codes for Multi-Relay Coded-Cooperative Networks
Design of Distributed Protograph LDPC Codes for Multi-Relay Coded-Cooperative Networks
复制标题
多中继编码协作网络分布式原图LDPC码设计
DOI：
10.1109/twc.2017.2743699
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发表时间：
2017-11-01
影响因子：
10.4
通讯作者：
Wang, Taotao
中科院分区：
文献类型：
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作者：
Fang, Yi;Liew, Soung Chang;Wang, Taotao
研究了Nakagami-m准静态衰落信道下具有L个中继站的两跳多中继系统的原型图低密度奇偶校验编码协作方案。我们提出了两种CC方案，即方案I和II，具有不同的最大码率，以满足不同的传输要求。我们进一步设计了一个家庭的分布式速率兼容根原模图（RCRP）码，以实现基于CC的多中继QSF信道的全分集。特别地，我们的具有L + 1个子码字的RCRP码在方案I中可以实现全分集，并且我们的具有两个子码字的RCRP码在方案II中可以通过最大比合并器实现全分集。此外，我们估计我们的RCRP码的渐近字错误率和误比特率使用广义原图外部信息传输算法，这是能够准确地描述有限长码字的错误性能。分析和仿真结果表明，我们的RCRP码可以实现在两个多中继CC架构的中断极限接近的性能。这使得RCRP编码框架对于具有慢变衰落的多中继协作通信应用极具吸引力。
This paper studies protograph low-density parity-check coded cooperation (CC) schemes for two-hop multi-relay systems with L relays over Nakagami-m quasi-static fading (QSF) channels. We propose two CC schemes, namely schemes I and II, with different maximum code rates to satisfy different transmission requirements. We further design a family of distributed rate-compatible root-protograph (RCRP) codes to achieve full diversity in CC-based multi-relay QSF channels. In particular, our RCRP codes with L + 1 sub-codewords can realize full diversity in scheme I, and our RCRP codes with two sub-codewords can achieve full diversity in scheme II with a maximum-ratio combiner. In addition, we estimate the asymptotic word error rate and bit error rate of our RCRP codes using a generalized protograph extrinsic information transfer algorithm, which is able to characterize the error performance of finite-length codewords accurately. Analysis and simulation show that our RCRP codes can achieve outage-limit-approaching performance in both multi-relay CC architectures. This makes the RCRP coding framework extremely attractive for multi-relay cooperative communication applications with slow-varying fading.