arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1105.0155cs.ITcs.NImath.IT
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异步物理层网络编码的最优解码算法

Optimal Decoding Algorithm for Asynchronous Physical-Layer Network Coding

Lu Lu, Soung Chang Liew, Shengli Zhang

摘要:

物理层网络编码(PNC)的一个关键问题是如何处理多个发射机发送的信号之间的串扰。也就是说,由不同发射器发射的符号可能在符号未对准以及相对载波相位偏移的情况下到达接收器。本文提出并研究了一种基于置信传播(BP)的通用框架,该框架可以有效地处理符号和相位噪声:2)对于BPSK和QPSK调制,与现有方法相比,我们的BP方法可以显著降低由于噪声引起的信噪比损失;(3)发现符号不对准使得系统性能对载波相位偏移的敏感性降低,并且对载波相位偏移具有更强的鲁棒性。第三,具有以下实际意义。控制符号定时比控制载波相位偏移相对容易。我们的结果表明,如果我们可以控制PNC中的符号偏移,则故意引入符号不对准以使系统对相位偏移不敏感实际上是有利的。

英文摘要:

A key issue in physical-layer network coding (PNC) is how to deal with the asynchrony between signals transmitted by multiple transmitters. That is, symbols transmitted by different transmitters could arrive at the receiver with symbol misalignment as well as relative carrier-phase offset. In this paper, 1) we propose and investigate a general framework based on belief propagation (BP) that can effectively deal with symbol and phase asynchronies; 2) we show that for BPSK and QPSK modulations, our BP method can significantly reduce the SNR penalty due to asynchrony compared with prior methods; 3) we find that symbol misalignment makes the system performance less sensitive and more robust against carrier-phase offset. Observation 3) has the following practical implication. It is relatively easier to control symbol timing than carrier-phase offset. Our results indicate that if we could control the symbol offset in PNC, it would actually be advantageous to deliberately introduce symbol misalignment to desensitize the system to phase offset.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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