一种基于增强奇偶校验码级联极化码的新型编译码方法

极化码作为一种纠错码,具有较好的编译码性能,已成为5G短码控制信道的标准编码方案。但在码长较短时,其性能不够优异。提出一种基于增强奇偶校验码级联极化码的新型编译码方法,在原有的奇偶校验位后设立增强校验位,对校验方程中信道可靠度较低的信息位进行双重校验,辅助奇偶校验码在译码过程中对路径进行修剪,以此提高路径选择的可靠性。仿真结果表明,在相同信道、相同码率码长下,本文提出的新型编译码方法比循环冗余校验(cyclic redundancy check,CRC)码级联极化码、奇偶校验(parity check,PC)码级联极化码误码性能更优异。在高斯信道下,当码长为128、码率为1/2、误码率为10-3时,本文提出的基于增强PC码级联的极化码比PC码级联的极化码获得了约0.3dB增益,与CRC辅助的极化码相比获得了约0.4 dB增益。

A novel method for encoding and decoding based on enhanced parity-check-concatenated polar codes

Polar codes have perfect coding and decoding performance as a kind of error correction code,which have become a standard coding scheme for 5G short code control channel.While the length of polar codes is short,its performance is not good enough.A novel method for encoding and decoding based on enhanced parity-check-concatenated polar codes was proposed.The enhanced check bit was set up after the parity-check(PC)bit to check the information bits with low channel reliability again,which could help path metric value prune the decoding path and improve the reliability of decoding path selection.The simulations reveal that the proposed method has better performance than cyclic redundancy check(CRC)concatenated polar codes and PC concatenated polar codes under the same channel,code length and code rate conditions.In additive white Gaussian noise channel,when the code length is 128,the code rate is 1/2 and the bit error rate is 10-3,the proposed method achieves a gain of about 0.3 dB over the PC codes cascaded polar codes,about 0.4 dB over the CRC assisted polar codes.