Full-duplex relays under multilevel coding: Correlation design via modulation labeling
Full-duplex relays under multilevel coding: Correlation design via modulation labeling
复制标题
DOI：
10.1109/pimrc.2017.8292273
复制
发表时间：
2017-10
期刊：
影响因子：
--
通讯作者：
A. Abotabl;Aria Nosratinia
中科院分区：
文献类型：
--
作者：
A. Abotabl;Aria Nosratinia
与半双工中继不同，全双工中继的性能对信源码本和中继码本之间的相关性高度敏感。线性编码使相关码本的设计复杂化，例如在多级编码（MLC）中，每层的线性码只能具有相关性零或一，导致在早期工作中已经表征的性能损失。在本文中，我们提出了一种新的设计技术，通过智能标记的调制，显着降低线性码的相关惩罚。其基本思想是：作为MLC的基础的互信息链规则在两个方面是不唯一的：调制星座的标记以及链规则的排序。我们在每个级别的优化推动涉及新信息（中继）或波束成形信息的互信息项为零或一。实际上，这找到了将总体相关性适当分解为MLC的各个级别处的一组二进制相关性。仿真结果表明，点到点LDPC码与所提出的相关设计相结合，导致优良的性能。
Unlike the half-duplex relay, the performance of the full-duplex relay is highly sensitive to the correlation between the source and relay codebooks. Linear coding complicates the design of correlated codebooks, for example in multilevel coding (MLC) linear codes at each layer can only have correlation zero or one, leading to a performance penalty that has been characterized in earlier work. In this paper, we propose a new design technique that significantly reduces the correlation penalty of linear codes via intelligent labeling for the modulation. The basic idea is as follows: the chain rule for mutual information, which is the backbone of MLC, is not-unique in two ways: the labeling of modulation constellation as well as the ordering of the chain rule. Our optimization at each level pushes the mutual information terms involving new information (for the relay) or beamforming information to zero or one. In effect this finds a suitable decomposition of overall correlation to a set of binary correlations at individual levels of MLC. Simulations show that point-to-point LDPC codes in combination with the proposed correlation design lead to excellent performance.