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arXiv 1802.07010cs.ITmath.IT
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实现容量的猜测随机加性噪声解码(GRAND)

Capacity-achieving Guessing Random Additive Noise Decoding (GRAND)

Ken R. Duffy, Jiange Li, Muriel Médard

摘要:

本文介绍了一种在有记忆和无记忆的离散信道中实现最大似然译码的新算法。其中,接收器将噪声序列从最可能到最不可能排序。按照该顺序从接收到的信号中减去噪声,产生码本的成员的第一个实例是ML解码。我们将这种算法命名为GRAND用于猜测随机加性噪声解码。我们确定,GRAND是容量实现时,使用随机码本。对于低于容量的速率,我们确定错误指数,对于超出容量的速率,我们确定成功指数。我们确定该计划的复杂性方面的计算接收器执行。对于超过容量的速率,这揭示了猜测次数的阈值,如果码本的一个成员被识别,则通过该阈值它可能是所发送的码字。我们引入了一个近似ML解码方案,其中接收器在固定数量的查询后放弃搜索,这种方法我们称之为GRANDAB,用于GRAND with ABanderisk。虽然不是ML解码器,我们建立的算法GRANDAB也是容量实现的放弃阈值的适当选择,并表征其复杂性,错误和成功指数。马尔可夫噪声的工作实例表明,这些解码方案大大优于暴力解码方法。

英文摘要:

We introduce a new algorithm for realizing Maximum Likelihood (ML) decoding in discrete channels with or without memory. In it, the receiver rank orders noise sequences from most likely to least likely. Subtracting noise from the received signal in that order, the first instance that results in a member of the code-book is the ML decoding. We name this algorithm GRAND for Guessing Random Additive Noise Decoding. We establish that GRAND is capacity-achieving when used with random code-books. For rates below capacity we identify error exponents, and for rates beyond capacity we identify success exponents. We determine the scheme's complexity in terms of the number of computations the receiver performs. For rates beyond capacity, this reveals thresholds for the number of guesses by which if a member of the code-book is identified it is likely to be the transmitted code-word. We introduce an approximate ML decoding scheme where the receiver abandons the search after a fixed number of queries, an approach we dub GRANDAB, for GRAND with ABandonment. While not an ML decoder, we establish that the algorithm GRANDAB is also capacity-achieving for an appropriate choice of abandonment threshold, and characterize its complexity, error and success exponents. Worked examples are presented for Markovian noise that indicate these decoding schemes substantially out-perform the brute force decoding approach.

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