Joint LDPC and Physical-Layer Network Coding for Asynchronous Bi-Directional Relaying

Joint LDPC and Physical-Layer Network Coding for Asynchronous Bi-Directional Relaying
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用于异步双向中继的联合 LDPC 和物理层网络编码

DOI:
10.1109/jsac.2013.130809
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发表时间:
2011-06
期刊:
IEEE Journal on Selected Areas in Communications-Aug-2013
影响因子:
--
通讯作者:
Xiaohu You
Xiaohu You
中科院分区:
其他
文献类型:
--
作者:
Xiaofu Wu;Chunming Zhao;Xiaohu You

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在实际的双向中继中,两个源发送的符号在到达中继站时不能具有完美的符号和帧对齐,需要认真考虑异步多址接入信道(MAC)。本文研究了在一般异步MAC协议下,同时考虑帧和符号失准的低密度奇偶校验(LDPC)编码BPSK信令.针对符号异步MAC协议,提出了一种形式化的对数域广义和积译码算法(Log-G-SPA).当中继端遇到帧不同步时,我们提出了一种新颖的方法,即采用循环LDPC码和简单的循环冗余校验(CRC)编码技术。仿真实验验证了该方法的有效性。
For practical bi-directional relaying, symbols transmitted by two sources cannot arrive at the relay with perfect symbol and frame alignments and the asynchronous multiple-access channel (MAC) should be seriously considered. In this paper, we consider the Low-Density Parity-Check (LDPC)-coded BPSK signalling over the general asynchronous MAC with both frame and symbol misalignments. For the symbol-asynchronous MAC, we present a formal log-domain generalized sum-product-algorithm (Log-G-SPA) for efficient decoding. When the frame-asynchronism is encountered at the relay, we propose an original approach by employing the cyclic LDPC codes and the simple cyclic-redundancy-check (CRC) coding technique. Simulation results demonstrate the effectiveness of the proposed approach.
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