基于Wi-Fi 7系统的改进LLR软判决算法仿真分析  

Simulation Analysis of Improved LLR Soft Decision Algorithm Based on Wi-Fi 7 System

作　　者：蔡云浩 刘祖深 许虎 CAI Yunhao;LIU Zushen;XU Hu(North University of China,Taiyuan 030051;CETC Sino-Instrument Technology(Anhui)Co.,Ltd.,Bengbu 233010;Bengbu Technology Innovation Center for Electronic Measurement Instrumentation Technology,Bengbu 233010)

机构地区：[1]中北大学,太原030051 [2]中电科思仪科技(安徽)有限公司,蚌埠233010 [3]电子测量仪器技术蚌埠市技术创新中心,蚌埠233010

出　　处：《舰船电子工程》2024年第12期101-105,共5页Ship Electronic Engineering

摘　　要：众所周知,准确的软信息对于Wi-Fi 7系统解码性能至关重要,然而现有的比特对数似然比(LLR)表达式计算复杂度较高。针对此问题,论文提出了一种改进的比特LLR表达式,以简化现有的LLR表达式计算复杂度高的缺点。首先对接收信号进行软决策QAM解调,生成近似对数似然比(LLR),然后使用软判决解调结果进行维特比解码,在多径衰落信道中评估了OFDM-based 4096-QAM的误码率性能,并将其与硬判决解码下的误码率性能进行比较。仿真结果表明,在算法度大大降低的条件下,改进后的软判决解码下的误码率性能仍明显优于硬判决,具有一定的工程实现价值。As is widely recognized,accurate soft information is crucial for the decoding performance of the Wi-Fi 7 system.However,the existing computation complexity of the Bit Log-Likelihood Ratio(LLR)expressions is high.To address this issue,this paper proposes an enhanced bit LLR expression to simplify the drawbacks of the high computation complexity in the current LLR expressions.Initially,the received signal undergoes soft decision QAM demodulation to generate approximate log-likelihood ra⁃tios(LLRs).Subsequently,the obtained soft decision demodulation results are employed for Viterbi decoding.The bit error rate per⁃formance of OFDM-based 4096-QAM is evaluated in multipath fading channels,and a comparison is made with the bit error rate performance under hard decision decoding.Simulation results indicate that,under significantly reduced computational require⁃ments,the BER performance of the improved soft decision decoding remains notably superior to hard decision decoding.This dem⁃onstrates certain engineering implementation value.

关 键 词：Wi-Fi 7 软判决 维特比解码 近似对数似然比 

分 类 号：TN929.5[电子电信—通信与信息系统]