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arXiv 0904.4741cs.ITmath.IT
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基于高斯混合的格点置信传播译码

Belief-Propagation Decoding of Lattices Using Gaussian Mixtures

Brian M. Kurkoski, Justin Dauwels

摘要:

给出了一种低密度格码的置信传播译码器,它将信息显式表示为高斯函数的混合。关键部分是一个算法,用于近似几个高斯的混合物与另一个混合物具有较少数量的高斯。这种高斯混合约简算法通过最小化原始混合与少一个高斯近似之间的距离来迭代地减少高斯的数量。该解码器的出错率和噪声阈值与先前提出的离散量化消息的解码器进行比较。出错率对于维度1000和10000的网格是不可区分的,并且高斯混合解码器对于维度100的网格具有0.2dB的损失。高斯混合解码器具有约0.03 dB的噪声阈值的损失,这是通过蒙特卡罗密度演化评估。此外,高斯混合解码器对消息使用少得多的存储。

英文摘要:

A belief-propagation decoder for low-density lattice codes is given which represents messages explicitly as a mixture of Gaussians functions. The key component is an algorithm for approximating a mixture of several Gaussians with another mixture with a smaller number of Gaussians. This Gaussian mixture reduction algorithm iteratively reduces the number of Gaussians by minimizing the distance between the original mixture and an approximation with one fewer Gaussians. Error rates and noise thresholds of this decoder are compared with those for the previously-proposed decoder which discretely quantizes the messages. The error rates are indistinguishable for dimension 1000 and 10000 lattices, and the Gaussian-mixture decoder has a 0.2 dB loss for dimension 100 lattices. The Gaussian-mixture decoder has a loss of about 0.03 dB in the noise threshold, which is evaluated via Monte Carlo density evolution. Further, the Gaussian-mixture decoder uses far less storage for the messages.

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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