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Error Propagation Mitigation in Sliding Window Decoding of Braided Convolutional Codes
IEEE Transactions on Communications ( IF 8.3 ) Pub Date : 2020-11-01 , DOI: 10.1109/tcomm.2020.3015945
Min Zhu , David G. M. Mitchell , Michael Lentmaier , Daniel J. Costello , Baoming Bai

We investigate error propagation in sliding window decoding of braided convolutional codes (BCCs). Previous studies of BCCs have focused on iterative decoding thresholds, minimum distance properties, and their bit error rate (BER) performance at small to moderate frame length. Here, we consider a sliding window decoder in the context of large frame length or one that continuously outputs blocks in a streaming fashion. In this case, decoder error propagation, due to the feedback inherent in BCCs, can be a serious problem. To mitigate the effects of error propagation, we propose several schemes: a window extension algorithm where the decoder window size can be extended adaptively, a resynchronization mechanism where we reset the encoder to the initial state, and a retransmission strategy where erroneously decoded blocks are retransmitted. In addition, we introduce a soft BER stopping rule to reduce computational complexity, and the tradeoff between performance and complexity is examined. Simulation results show that, using the proposed window extension algorithm, resynchronization mechanism, and retransmission strategy, the BER performance of BCCs can be improved by up to four orders of magnitude in the signal-to-noise ratio operating range of interest, and the soft BER stopping rule can be employed to reduce computational complexity.

中文翻译:

编织卷积码滑动窗口解码中的误差传播缓解

我们研究了编织卷积码 (BCC) 滑动窗口解码中的错误传播。先前对 BCC 的研究集中在迭代解码阈值、最小距离属性及其在小到中等帧长度下的误码率 (BER) 性能。在这里,我们考虑在大帧长度或以流方式连续输出块的上下文中的滑动窗口解码器。在这种情况下,由于 BCC 中固有的反馈,解码器错误传播可能是一个严重的问题。为了减轻错误传播的影响,我们提出了几种方案:一种可以自适应扩展解码器窗口大小的窗口扩展算法,一种将编码器重置为初始状态的重新同步机制,以及一种重传错误解码块的重传策略. 此外,我们引入了软 BER 停止规则来降低计算复杂度,并检查性能和复杂度之间的权衡。仿真结果表明,使用所提出的窗口扩展算法、重同步机制和重传策略,在感兴趣的信噪比工作范围内,BCC 的 BER 性能可以提高多达四个数量级,并且软BER停止规则可用于降低计算复杂度。
更新日期:2020-11-01
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