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SCL Polar Decoder를 위한 간략화된 Bitonic 정렬기의 설계 및 분석
한승우(Seung Woo Han),최훈환(Hun Hwan Choi),강채현(Chae Hyun Kang),공병용(Byeong Yong Kong) 대한전자공학회 2022 대한전자공학회 학술대회 Vol.2022 No.11
In this paper, a simplified bitonic sorter is designed and analyzed for successive cancellation list (SCL) polar decoders. First of all, unnecessary compare-and-swap units (CASUs) are identified and removed based on the relationships between the metrics in the list of SCL decoding. In addition, the CASU depth and the number of CASUs in the proposed sorter are formulated for arbitrary list sizes, and the metrics calculated by the derived formulae are compared with those of the original counterpart. Only 45% of the CASUs in the original bitonic sorter are required to build the proposed sorter.
깊은 파이프라인의 SCL Polar Decoder를 위한 단 수를 줄인 Odd-Even 정렬기 구조
최훈환(Hun Hwan Choi),한승우(Seung Woo Han),강채현(Chae Hyun Kang),공병용(Byeong Yong Kong) 대한전자공학회 2022 대한전자공학회 학술대회 Vol.2022 No.11
This paper presents a stage-reduced odd-even sorter architecture for deeply pipelined successive cancellation list (SCL) polar decoders. First, by exploiting the relationships between the metrics of candidates maintained during the decoding process, unnecessary compare-and-swap units (CASUs) are pruned. Subsequently, the CASUs are relocated to minimize the number of CASU stages to go through from the beginning to the end of the sorter. Moreover, to verify the efficacy of the proposed sorter architecture for arbitrary list sizes, generalized formulae are derived. As a result, compared with the original odd-even sorter, about 60% CASUs and a few stages can be removed.