高吞吐率的并行化极化码CRC-SCL译码器的FPGA实现  

Implementation of FPGA Based on High Throughput Parallel CRC-SCL Decoder of Polar Codes

作　　者：刘彦君 李岩 刘宇旸[1,2] 贾晓硕 周洪航 洪小斌 邱吉芳 郭宏翔[1,2] 左勇 李蔚[1,2] 伍剑 Liu Yanjun;Li Yan;Liu Yuyang;Jia Xiaoshuo;Zhou Honghang;Hong Xiaobin;Qiu Jifang;Guo Hongxiang;ZuoYong;Li Wei;Wu Jian(School of Electronic Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China;State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876,China)

机构地区：[1]北京邮电大学电子工程学院,北京100876 [2]北京邮电大学信息光子学与光通信国家重点实验室,北京100876

出　　处：《光学学报》2021年第17期32-41,共10页Acta Optica Sinica

基　　金：国家重点研发计划课题(2019YFB1803601);国家自然科学基金(62021005,61875019);中央高校基本科研业务基金。

摘　　要：极化码是通过严格的数学方法证明能达到信道容量极限的编码方案。为了使极化码应用于高速实时光通信系统中,采用完全展开式流水线架构,基于Xilinx xcvu13p-flga2577-1-e型号的现场可编程门阵列(FPGA)芯片,首次从硬件上实现了256码长适配多种码率的循环冗余校验码辅助的连续消除列表(CRC-SCL)译码器。该译码器在156.25 MHz的最大时钟频率下,总吞吐率达到40 Gbit/s。同时进行了基于极化码的56-Gbit/s(28-GBaud)正交相移键控背靠背实验。实验结果表明,所实现的CRC-SCL译码器能够在误码率为10-3处获得7.5 dB的编码增益。此外,为了权衡纠错性能和资源量消耗,分析了量化位数对译码器性能的影响。Polar codes belong to a coding scheme that is proved to reach the limit of channel capacity by strict mathematical methods.To apply polar codes to high-speed real-time optical communication systems,we adopt a fully-unrolled pipeline architecture in this paper.Based on Xilinx xcvu13 p-flga2577-1-e field programmable gate array(FPGA)chips,we develop a successive cancellation list(CRC-SCL)decoder based on cyclic redundancy check codes with a code length of 256 for the first time in hardware,and this decoder can be adapted to various code rates.The total throughput of the decoder reaches 40 Gbit/s at the maximum clock frequency of 156.25 MHz.In addition,we carry out 56-Gbit/s(28-Gbaud)QPSK back-to-back experiments based on polar codes.Experimental results show that the CRC-SCL decoder implemented in this paper can obtain a coding gain of 7.5 dB when the bit error rate is equal to 10-3.Furthermore,to balance the error correction performance and resource consumption,we also analyze the influence of quantization bits on the decoder performance.

关 键 词：光通信 相位调制 光纤通信 极化码 现场可编程门阵列 

分 类 号：TN929.11[电子电信—通信与信息系统]