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:
影响因子:
--
通讯作者:
Xiaohu You
中科院分区:
文献类型:
--
作者:
Xiaofu Wu;Chunming Zhao;Xiaohu You
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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