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arXiv 1006.0795cs.ITmath.IT
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信道解码的贝叶斯译码器

Channel Decoding with a Bayesian Equalizer

Luis Salamanca, Juan José Murillo-Fuentes, Fernando Pérez-Cruz

摘要:

低密度奇偶校验(LPDC)解码器假设信道状态信息(CSI)是已知的,并且它们对每个传输比特具有真实的后验概率(APP)。但在大多数感兴趣的情况下,CSI需要在短训练序列的帮助下进行估计,并且LDPC解码器必须使用错误的APP估计来解码接收到的字。在本文中,我们研究了CSI估计的不确定性,以及它如何影响LDPC解码器输出的比特出错率(BER)。为了改善这些APP估计,我们提出了一个贝叶斯均衡器,它不仅考虑到由于信道中的噪声的不确定性,而且还考虑到CSI估计的不确定性,降低了LDPC解码器后的BER。

英文摘要:

Low-density parity-check (LPDC) decoders assume the channel estate information (CSI) is known and they have the true a posteriori probability (APP) for each transmitted bit. But in most cases of interest, the CSI needs to be estimated with the help of a short training sequence and the LDPC decoder has to decode the received word using faulty APP estimates. In this paper, we study the uncertainty in the CSI estimate and how it affects the bit error rate (BER) output by the LDPC decoder. To improve these APP estimates, we propose a Bayesian equalizer that takes into consideration not only the uncertainty due to the noise in the channel, but also the uncertainty in the CSI estimate, reducing the BER after the LDPC decoder.

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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