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Improving Belief Propagation Decoding of Polar Codes using Bi-Directional Bit-Flipping Strategy
Author(s)
Mitsungnern, Nuttawat
Imtawil, Virasit
Meesomboon, Anupap
Khunkitti, Pirat
Phakphisu, Watid
Suthisopapan, Puripong
Date Issued
July 1, 2022
Type
Article
Abstract
It is difficult to achieve high throughput and low latency from the cyclic redundancy check (CRC-) aided successive cancellation list (CA-SCL) polar decoder employed in 5G new radio systems. To tackle this problem, the hardware-efficient belief propagation (BP) decoder has been extensively studied. Unfortunately, the performance of the BP decoding for polar codes is quite poor. To improve the performance of this decoder, a novel bi-directional bit-flipping (BF) strategy is proposed. The rule of generating the flip set based on the post log-likelihood ratio (LLR) is combined with the possibility of the two-way flipping. With the help of this idea, the decoding performance of BP decoder is identical to that of the CA-SCL decoder. Moreover, with the same complexity, our proposed BF strategy outperforms both the best known one-directional BF strategy and the previously found bi-directional BF strategy at BLER of 10-4.
Citation
Engineering Access, 8(2), 287-295, 2022