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arXiv 0711.1986cs.ITmath.IT
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先验信息信道译码的性能界和码设计准则

Performance bounds and codes design criteria for channel decoding with a-priori information

Andrea Abrardo

摘要:

在这篇文章中,我们专注于在先验信息的存在下的信道解码问题。特别是,假设先验信息的可靠性是不完美的估计在接收机,我们得到一个新的分析框架,用于评估解码器的性能。得出了一个重要的结果,即一个“好的代码”,允许充分利用先验信息的潜在益处的代码必须将具有高汉明权重的信息序列与具有低汉明权重的码字相关联。在此基础上,分析了卷积码、随机码和Turbo码的性能。此外,我们认为相关的二进制源从独立的节点,一个有几个实际应用的问题,例如,在传感器网络的情况下,传输。在这方面,我们提出了一个非常简单的联合信源信道Turbo解码方案,每个解码器的工作原理,利用先验信息由其他解码器。在块衰落信道的情况下,它示出的信息信号之间的固有相关性提供了一种形式的非合作分集,从而允许联合信源信道解码优于基于分离的方案。

英文摘要:

In this article we focus on the problem of channel decoding in presence of a-priori information. In particular, assuming that the a-priori information reliability is not perfectly estimated at the receiver, we derive a novel analytical framework for evaluating the decoder's performance. It is derived the important result that a "good code", i.e., a code which allows to fully exploit the potential benefit of a-priori information, must associate information sequences with high Hamming weights to codewords with low Hamming weights. Basing on the proposed analysis, we analyze the performance of convolutional codes, random codes, and turbo codes. Moreover, we consider the transmission of correlated binary sources from independent nodes, a problem which has several practical applications, e.g. in the case of sensor networks. In this context, we propose a very simple joint source-channel turbo decoding scheme where each decoder works by exploiting a-priori information given by the other decoder. In the case of block fading channels, it is shown that the inherent correlation between information signals provide a form of non-cooperative diversity, thus allowing joint source-channel decoding to outperform separation-based schemes.

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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