Improved Belief Propagation List Decoding for Polar Codes

Polar codes have become the channel coding scheme for control of enhanced mobile broadband in 5G communication systems. Belief propagation (BP) decoding polar has advantages low latency and high parallelism but achieves worse bit error ratio (BER) performance compared with successive cancellation list (SCL) scheme. In this paper, an improved BP (IBPL) algorithm is proposed comparable BER to SCL algoritm. Firstly, optimal permuted factor graph analyzed codes, which improves decoder without path extension. Furthermore, based on graph, metric are extend prune path. The IBPL focused not only permutation also reliabilities decoded codewords during each iteration decoding, a more accurate list. simulation results show that original significantly, can approach at signal noise regions.