Research And Implementation On Polar Codes Scheme For Moderate Or Short Code Length

Polar codes have been selected as the controlling channel coding scheme in 5G eMBB scenario due to the excellent performance,which attracted the attention of academic circle again The major advantage of polar codes is that it has low encoding and decoding complexity,and can be mathematically proved to be a coding scheme which achieves the channel capacity However,in practice,the performance of polar codes of the moderate or short code length will degrade exponentially.Therefore,it is always the hotspots of research that improving the performance of the polar codes of the moderate code length.In order to solve this problem,polar codes with memory(PCM)is proposed in this paper.By containing a controlled number of mutual information bits in the consecutive encoding blocks,a failed decoded block can possibly obtain the correct shared bits,and start a new round of decoding.The shared bits will be treated as frozen bits in the re-decoding.The PCM scheme can employ any polar codes decoding scheme such as the successive cancellation(SC)decoding(PCM-SC),the belief propagation(BP)decoding(PCM-BP),and the successive cancellation list(SCL)decoding(PCM-SCL).Simulation results indicate that the packet error rate(PER)of PCM-SC outperforms that of the conventional SC decoding by about 0.27 dB.The PER of PCM-SCL with list size of L can match that of the conventional SCL decoding with list size of 2LIn addition,this scheme can be directly extended to m blocks(m?2).Based on this,a general PCM is further proposed in this paper,which reduces the rate loss while maintaining the same order of packet error rate,comparing with the direct extension of PCMTwo hardware decoders for PCM-SC are also implemented:the in-serial(IS)decoder and the low-latency interleaved(LLI)decoder.Synthesis results show that the LLI decoder has the lowest latency and the highest throughput,comped with the IS decoder,the conventional SC decoder and the SCL decoder.