In order to improve the performance of the path splitting selecting strategy based on search set under the successive cancellation list (PSS-SS-SCL) decoding algorithm, an improved decoding algorithm based on the enhanced pari⁃ ty check code and Monte Carlo segment aiding successive cancellation list (EPC-MS-SCL) is proposed. The algorithm di⁃ vides the information sequence into some segments in the encoding stage of the polar code, and adds an enhanced parity check code at the end of each segment. The decoder performs the path splitting only when decoding the elements within the search set (SS), and directly does the hard decision for the other unfrozen bits. The decoder will verify the segment immedi⁃ ately after decoding a sequence, the verified path can only be retained. Thus the competition from the wrong paths to the correct path can be reduced to increase the probability of keeping the correct path until the end of the decoding and the per⁃ formance of the decoding can be improved. Meanwhile, the decoding complexity is also reduced because of decreasing the number of the decoding lists. Simulation results show that compared with the PSS-SS-SCL decoding algorithm, the pro⁃ posed decoding algorithm can improve the coding gain to a certain degree and reduce the decoding complexity too. © 2023 Chinese Institute of Electronics. All rights reserved.
