Polar Coding with Enhanced Channel Polarization under Frequency Selective Fading Channels
Polar Coding with Enhanced Channel Polarization under Frequency Selective Fading Channels
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DOI：
10.1109/icc.2018.8422465
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发表时间：
2018-05
期刊：
影响因子：
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通讯作者：
M. Oda;T. Saba
中科院分区：
文献类型：
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作者：
M. Oda;T. Saba
Arikan提出的极化编码作为一种低复杂度、高纠错能力的信道编码方案引起了人们的关注。在极化码中，极化解码器的每个输出比特被不正确解码的概率取决于输出比特的位置而不同。这是由于信道极化的影响。在极化编码中，增强信道极化的效果是重要的，特别是当码字长度不够长时。本文提出了一种适用于频率选择性衰落信道下正交频分复用（OFDM）系统的极化编码方案。在我们的极化编码方案中，码字比特被置换，使得源自冻结比特的比特被分配给导致频繁比特错误的子载波。我们可以把这种排列看作是一种增强信道极化的交织。因此，极化被执行两次;一次是由于极化编码，另一次是由于基于信道状态的交织。由于信道极化效应的增强，可以预期误码率（BER）性能的改善。通过计算机仿真，我们表明，使用极化码与我们的交织方案的系统优于使用极化码与随机交织的系统。
Polar coding proposed by Arikan attracts attention as a channel coding scheme with low complexity and high error correction capability. In polar codes, the probability that each output bit of a polar decoder is incorrectly decoded differs depending on the positions of the output bits. This is due to the effect of the channel polarization. In polar coding, enhancing the effect of the channel polarization is important, especially when the codeword length is not long enough. In this paper, we propose a polar coding scheme for orthogonal frequency division multiplexing (OFDM) systems under frequency selective fading channels. In our polar coding scheme, the codeword bits are permuted so that the bits stemmed from the frozen bits are allocated to subcarriers causing frequent bit errors. We can regard this permutation as a kind of interleaving that enhances the channel polarization. As a result, the polarization is carried out twice; one is due to polar coding, and the other is due to interleaving based on the channel state. Since the effect of the channel polarization is enhanced, the improvement in bit error rate (BER) performance can be expected. Through computer simulation, we show that the system using the polar code with our interleaving scheme outperforms the system using the polar code with random interleaving.