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arXiv 1802.08595cs.ITmath.IT
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时变同步错误分组码:MAP译码器及实际问题

Time-Varying Block Codes for Synchronization Errors: MAP Decoder and Practical Issues

Johann A. Briffa, Victor Buttigieg, Stephan Wesemeyer

摘要:

\begin{abstract}在本文中,我们考虑时变块(TVB)码,它概括了许多以前的同步纠错码。我们还考虑了各种实际问题,这些代码的MAP解码。具体来说,我们给出了一个表达式的预期分布的发送器和接收器之间的漂移由于同步误差。我们确定一个适当的选择状态空间限制的基础上的漂移概率分布。反过来,我们得到一个表达式的解码器的复杂性在给定的信道条件下的状态空间的限制。对于一个给定的状态空间,我们也给出了一些优化,降低了算法的复杂度,解码器的性能没有进一步的损失。我们还展示了如何MAP解码器可以在已知的帧边界的情况下使用,并证明了解码器参数的适当选择允许解码器接近的性能时,帧边界是已知的,在复杂性增加一些费用。最后,我们表示一些现有的结构,TVB代码,性能与公布的结果进行比较,并表明,提高性能是可能的,利用TVB代码的灵活性。

英文摘要:

\begin{abstract} In this paper we consider Time-Varying Block (TVB) codes, which generalize a number of previous synchronization error-correcting codes. We also consider various practical issues related to MAP decoding of these codes. Specifically, we give an expression for the expected distribution of drift between transmitter and receiver due to synchronization errors. We determine an appropriate choice for state space limits based on the drift probability distribution. In turn, we obtain an expression for the decoder complexity under given channel conditions in terms of the state space limits used. For a given state space, we also give a number of optimizations that reduce the algorithm complexity with no further loss of decoder performance. We also show how the MAP decoder can be used in the absence of known frame boundaries, and demonstrate that an appropriate choice of decoder parameters allows the decoder to approach the performance when frame boundaries are known, at the expense of some increase in complexity. Finally, we express some existing constructions as TVB codes, comparing performance with published results, and showing that improved performance is possible by taking advantage of the flexibility of TVB codes.

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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