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The design of protograph LDPC codes for channel-coded physical-layer network coding

机译:用于信道编码的物理层网络编码的协议LDPC码的设计

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For two-way relay channel-coded physical network coding (CPNC) systems with sufficiently low code rate, the separate complete decoding (SCD) scheme outperforms the joint channel-physical network coding (JCNC) scheme. Hence, this paper addresses the design of protograph LDPC codes to approach the SCD-based CPNC capacity. In fact, due to virtual erasures induced by CPNC transmission, the conventional protograph that approaches point to point (P2P) AWGN capacity may not perform well in SCD-based CPNC channel in terms of error rates. We then use the finite-length EXIT chart to calculate iterative decoding threshold of a joint code graph formed by two codes in the SCD. Furthermore, we investigate the serial separate complete decoding (S-SCD) and parallel separate decoding (P-SCD). Simulation results show that with the S-SCD, the proposed protograph codes have within 0.9 dB of their capacity limits for rates from 1/3 to 3/5.
机译:对于具有足够低码率的双向中继信道编码物理网络编码(CPNC)系统,单独的完整解码(SCD)方案优于联合信道物理网络编码(JCNC)方案。因此,本文着眼于原型LDPC码的设计,以接近基于SCD的CPNC容量。实际上,由于CPNC传输引起的虚拟擦除,接近点对点(P2P)AWGN容量的常规协议在错误率方面可能无法在基于SCD的CPNC信道中很好地发挥作用。然后,我们使用有限长度EXIT图来计算由SCD中的两个代码形成的联合代码图的迭代解码阈值。此外,我们研究了串行独立完整解码(S-SCD)和并行独立完整解码(P-SCD)。仿真结果表明,对于S-SCD,建议的原型代码在1/3至3/5的速率下,其容量限制在0.9 dB以内。

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