arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.04897cs.ITmath.IT
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噪音回收

Noise Recycling

Alejandro Cohen, Amit Solomon, Ken R. Duffy, Muriel Médard

摘要:

我们介绍了噪声回收,一种方法,大大提高了解码性能的正交信道相关噪声,而不需要联合编码或解码。该方法可以与代码、码率和解码技术的任何组合一起使用。在该方法中,通过从其接收信号中减去其解码输出来从前导信道估计噪声的连续实现。该估计被再循环以降低正经历相关噪声的正交信道的信噪比(SNR),从而提高其解码的准确性。在该设计中,信道仅通过提供解码后的噪声估计来彼此辅助。对于一个系统与任意噪声相关的正交信道之间经历潜在的不同条件,我们介绍了一种算法,确定一个静态的解码顺序,最大限度地提高总的有效SNR。我们证明,这种解决方案的结果在更高的有效信噪比比独立解码,这反过来又导致一个更大的速率区域。我们推导出上界和下界的能力,任何顺序解码的正交信道的相关噪声的编码器是独立的,并表明这些界限几乎是紧的。我们数值比较的上限与容量的联合高斯噪声信道的联合编码和解码,显示它们匹配。仿真结果表明,噪声回收可以采用任何组合的代码和解码器,它给出了显着的块出错率(BLER)的好处时,应用静态预定顺序用于增强速率区域。我们进一步确定,通过动态噪声回收可以实现额外的BLER改善,其中前导信道不是预先确定的,而是基于哪个解码器提供最有信心的解码来实时选择的。

英文摘要:

We introduce Noise Recycling, a method that substantially enhances decoding performance of orthogonal channels subject to correlated noise without the need for joint encoding or decoding. The method can be used with any combination of codes, code-rates and decoding techniques. In the approach, a continuous realization of noise is estimated from a lead channel by subtracting its decoded output from its received signal. The estimate is recycled to reduce the Signal to Noise Ratio (SNR) of an orthogonal channel that is experiencing correlated noise and so improve the accuracy of its decoding. In this design, channels only aid each other only through the provision of noise estimates post-decoding. For a system with arbitrary noise correlation between orthogonal channels experiencing potentially distinct conditions, we introduce an algorithm that determines a static decoding order that maximizes total effective SNR. We prove that this solution results in higher effective SNR than independent decoding, which in turn leads to a larger rate region. We derive upper and lower bounds on the capacity of any sequential decoding of orthogonal channels with correlated noise where the encoders are independent and show that those bounds are almost tight. We numerically compare the upper bound with the capacity of jointly Gaussian noise channel with joint encoding and decoding, showing that they match. Simulation results illustrate that Noise Recycling can be employed with any combination of codes and decoders, and that it gives significant Block Error Rate (BLER) benefits when applying the static predetermined order used to enhance the rate region. We further establish that an additional BLER improvement is possible through Dynamic Noise Recycling, where the lead channel is not pre-determined but is chosen on-the-fly based on which decoder provides the most confident decoding.

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