基于非均匀量化的极化码SCL译码器FPGA实现  

Design of SCL Decoder Based on Non-uniform QuantizedPolarization Code of FPGA

作　　者：魏少圣 熊启金 郑绍华[1] 陈平平[1] WEI Shaosheng;XIONG Qijin;ZHENG Shaohua;CHEN Pingping(College of Physical and Information Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学物理与信息工程学院,福建福州350108

出　　处：《无线电通信技术》2024年第6期1200-1208,共9页Radio Communications Technology

基　　金：国家自然科学基金面上项目(62171135)。

摘　　要：针对现有均匀量化的连续消除列表(Successive Cancellation List,SCL)译码算法中存储资源消耗大、布线延迟高的问题,提出了一种采用5 bit非均匀量化方案的SCL译码算法。该算法保留均匀量化中的对数似然比(Log-Likelihood Ratio,LLR)迭代计算方法,采用5 bit非均匀量化LLR,在LLR计算模块中设计查找表(Look-Up-Table,LUT)转为6 bit均匀量化LLR用于计算。仿真结果表明,提出的5 bit非均匀量化SCL译码相比于6 bit均匀量化SCL译码器,在码率R=1/2、列表宽度L=2和L=4时,误帧率(Frame Erasure Rate,FER)性能损失在0.1 dB以内。在硬件资源消耗方面,与6 bit均匀量化译码器相比,5 bit非均匀量化方案译码器在L=2时触发器(Flip-Flop,FF)和块随机存取存储器(Block Random Access Memory,BRAM)存储资源消耗分别减少了10.9%和22%,吞吐量增加了24%;L=4时FF和BRAM分别减少了10%和18.1%,吞吐量增加了17.5%。In order to solve the problem of large storage resource consumption and high wiring delay in the existing uniformly quantized Successive Cancellation List(SCL)decoding algorithms,a SCL decoding algorithm using 5 bit non-uniform quantization scheme is proposed.The algorithm retains the iterative calculation method of Log-Likelihood Ratio(LLR)in uniform quantization,adopts 5 bit non-uniform quantization of LLR,and designs a Look-Up Table(LUT)in the LLR calculation module to convert to 6 bit uniformly quantized LLR for calculation.Simulation results show that compared with the 6 bit uniformly quantized SCL decoder,the performance loss of Frame Erasure Rate(FER)frame error rate is less than 0.1 dB when the bitrate R=1/2 list width L=2 and L=4 are used.In terms of hardware resource consumption,compared with the 6 bit uniform quantization decoder,the Flip-Flop(FF)and Block Random Access Memory(BRAM)storage resource consumption of the 5 bit non-uniform quantization scheme decoder are reduced by 10.9% and 22%,respectively,and the throughput is increased by 24% when L=2.At L=4,FF and BRAM decreased by 10% and 18.1%,respectively,and throughput increased by 17.5%.

关 键 词：极化码 连续消除列表译码 非均匀量化 现场可编程逻辑门阵列 

分 类 号：TN911[电子电信—通信与信息系统]