Improving Belief Propagation Decoding of Polar Codes using Bi-Directional Bit-Flipping Strategy

doi: 10.14456/mijet.2022.34

Authors

  • Nuttawat Mitsungnern Khon Kaen University, Thailand
  • Virasit Imtawil Khon Kaen University, Thailand
  • Anupap Meesomboon Khon Kaen University, Thailand
  • Pirat Khunkitti Khon Kaen University, Thailand
  • Watid Phakphisut King Mongkut's Institute of Technology Ladkrabang, Thailand
  • Puripong Suthisopapan Khon Kaen University, Thailand

Keywords:

polar codes, belief propagation, bit-flipping

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.

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Author Biographies

Nuttawat Mitsungnern, Khon Kaen University, Thailand

Department of Electrical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, Thailand

Virasit Imtawil, Khon Kaen University, Thailand

Department of Electrical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, Thailand

Anupap Meesomboon, Khon Kaen University, Thailand

Department of Electrical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, Thailand

Pirat Khunkitti, Khon Kaen University, Thailand

Department of Electrical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, Thailand

Watid Phakphisut, King Mongkut's Institute of Technology Ladkrabang, Thailand

Department of  Telecommunication Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand

Puripong Suthisopapan, Khon Kaen University, Thailand

Department of Electrical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, Thailand

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Published

2022-08-02

Issue

Section

Research Papers