Design and Analysis of BICM-ID for Two-Way Relay Channels With Physical-Layer Network Coding
Design and Analysis of BICM-ID for Two-Way Relay Channels With Physical-Layer Network Coding
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DOI：
10.1109/tvt.2017.2757151
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发表时间：
2017-11
影响因子：
6.8
通讯作者：
Zichao Sun;Li Chen;Xiaojun Yuan;Yushan Yakufu
中科院分区：
文献类型：
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作者：
Zichao Sun;Li Chen;Xiaojun Yuan;Yushan Yakufu
提出了一种适用于物理层网络编码双向中继（TWR）通信的通用迭代解映射解码方法，中继节点执行解码转发。研究了高阶正交幅度调制的比特交织编码调制（BICM）。介绍了TWR信道的迭代译码，即BICM-ID。BICM-ID算法基于联合网格结构，对端节点的编码比特进行估计，从而得到发送符号对概率的估计，这对于提高迭代译码的误码率至关重要。提出了端节点星座设计准则，以优化BICM-ID在TWR衰落信道下的性能。外部信息传递分析也被执行，显示迭代系统的收敛行为，并提供代码设计的信息。我们的仿真结果表明，所提出的BICM-ID方案可以实现显着的性能增益，产生一个渐近的趋势，接近割集BER性能极限。
This paper proposes a general iterative demapping–decoding approach for two-way relay (TWR) communications with physical-layer network coding, where the relay node performs decode-and-forward. The bit-interleaved coded modulation (BICM) with high-order quadrature amplitude modulation is considered. The iterative decoding, namely the BICM-ID for TWR channels, is introduced. Based on a joint trellis, BICM-ID estimates the end nodes’ coded bits, leading to an estimation of the transmitted symbol pair probability, which is crucial for achieving iterative decoding gains in bit error rate (BER). The end nodes’ constellation design criterion is proposed to optimize the BICM-ID performance over the TWR fading channel. The EXtrinsic Information Transfer analysis is also performed, showing the iterative system's convergence behavior and providing information on code design. Our simulation results show the proposed BICM-ID scheme can achieve significant performance gains, yielding an asymptotic tendency of approaching the cut-set BER performance limit.