Efficient HARQ scheme based on rate-compatible punctured polar codes
Sha Wang, Jian Jiao, Bowen Feng, Shaohua Wu, Shushi Gu, Qinyu Zhang · 2017
In this paper, an optimized parallel concatenated punctured polar (OPCPP) coding scheme is designed to realise the rate-compatible property of polar codes. First, an improved random puncturing pattern of polar codes is proposed to achieve better performance than the random puncturing scheme, which can obtain about 0.2-1dB better than the random puncturing scheme. Then, by analyzing the performance of HARQ transmission scheme via OPCPP coding blocks over slow fading channels, the optimal initial code rate of each new OPCPP coding block can be determined by the overhead of the previous successful decoded coding block. Simulation results show that the mean number of retransmissions in our proposed rate-compatible HARQ scheme is about 1.5 times with the encoding construct of a 2-level OPCPP codes, which can reduce half of the number of retransmissions than the existing rate-compatible polar coding scheme.