Multilevel Coded Modulation for the Full-Duplex Relay Channel
Multilevel Coded Modulation for the Full-Duplex Relay Channel
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DOI：
10.1109/twc.2018.2797967
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发表时间：
2018-06
影响因子：
10.4
通讯作者：
A. Abotabl;Aria Nosratinia
中科院分区：
文献类型：
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作者：
A. Abotabl;Aria Nosratinia
我们研究了全双工中继信道的编码调制，提出并分析了一种容量接近性能和实用功能的多级编码（MLC）框架。导出了多级编码满足解码和转发中继的已知可实现速率的充分条件。研究了比特加性叠加和多级码分量的线性对系统性能的影响。结果表明，中继组件代码的线性度不会对速率造成影响，然而，源到中继组件代码的线性度可能会造成性能损失，特别是对于小调制星座。我们表明，这种速率损失的发生是因为源节点处码本的线性约束在多级编码层中速率分配的最优性与源/中继码本相关性的最优性之间引入了新的张力。受这一见解的启发，提出了一种替代调制标签，可以最大限度地减少速率损失。结果扩展到多天线中继。还分析了发射机处没有信道状态的慢衰落和快速瑞利衰落。研究了所提出方案的误差指数。最后，通过使用点对点LDPC码进行仿真，研究了所提出方案的误帧率和误码率性能，表明所提出的MLC中继具有优异的性能。
We investigate coded modulation for full-duplex relay channels, proposing and analyzing a multilevel coding (MLC) framework with capacity approaching performance and practical features. Sufficient conditions are derived under which multilevel coding meets the known achievable rates for decode-and-forward relaying. The effect of a bit additive superposition and the linearity of multilevel code components on the performance of the system are studied. It is shown that linearity of the relay component codes imposes no penalty on rate, however, the linearity of the source-to-relay component codes may impose a performance penalty especially for small modulation constellations. We show that this rate loss occurs because a linearity constraint on codebooks at the source node introduces a new tension between optimality of rate allocation in multilevel coding layers and optimality of source/relay codebook correlations. Motivated by this insight, an alternative modulation labeling is proposed that minimizes the rate loss. The results are extended to multi-antenna relays. Slow fading and fast Rayleigh fading without channel state at the transmitter are also analyzed. The error exponent of the proposed scheme is studied. Finally, the frame- and bit-error rate performance of the proposed scheme is studied via simulations using point-to-point LDPC codes, showing that the proposed MLC relaying has excellent performance.