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arXiv 1004.4590cs.ITmath.IT
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带噪声反馈的AWGN信道的级联编码

Concatenated Coding for the AWGN Channel with Noisy Feedback

Zachary Chance, David J. Love

摘要:

如果信道可以获得反馈,则开环编码的使用可以容易地扩展到闭环级联码。这可以通过引入反馈传输方案作为内码来完成。在本文中,这个过程中的情况下,当一个线性反馈方案被实现为一个内码,特别是在加性高斯白噪声(AWGN)信道与噪声反馈。首先,我们希望通过优化接收到的信噪比来获得最佳的线性反馈方案。从这个优化,一个渐近最优的线性反馈方案,并与其他知名的计划。然后,线性反馈方案被实现为在具有噪声反馈的AWGN信道上的级联码的内码。该编码不仅在误码指数界上有改进,而且在误码率和误帧率上也有改进。如果级联码的总块长为L,内码的总块长为N,则内码的块长应按N = O(C/R)的比例缩放,其中C为信道容量,R为外码速率。低密度奇偶检验(LDPC)和Turbo码的仿真显示这些优点。

英文摘要:

The use of open-loop coding can be easily extended to a closed-loop concatenated code if the channel has access to feedback. This can be done by introducing a feedback transmission scheme as an inner code. In this paper, this process is investigated for the case when a linear feedback scheme is implemented as an inner code and, in particular, over an additive white Gaussian noise (AWGN) channel with noisy feedback. To begin, we look to derive the optimal linear feedback scheme by optimizing over the received signal-to-noise ratio. From this optimization, an asymptotically optimal linear feedback scheme is produced and compared to other well-known schemes. Then, the linear feedback scheme is implemented as an inner code to a concatenated code over the AWGN channel with noisy feedback. This code shows improvements not only in error exponent bounds, but also in bit-error-rate and frame-error-rate. It is also shown that the if the concatenated code has total blocklength L and the inner code has blocklength, N, the inner code blocklength should scale as N = O(C/R), where C is the capacity of the channel and R is the rate of the outer code. Simulations with low density parity check (LDPC) and turbo codes are provided to display these advantages.

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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