中继系统在太赫兹链路中的性能分析OA

Terahertz wireless links have become a research hotspot of next-generation information trans-mission technologies.However,in practical wireless communication,signal transmissions suffer from se-rious degradation due to challenges like complex transmission environments,channel fading and mul-tipath effects.The introduction of relay systems into terahertz wireless links can effectively mitigate these signal losses.This paper analyzes and evaluates the performances of amplify-and-forward relay communi-cation systems and decode-and-forward relay communication systems using Beaulieu-Xie distribution and Fisher-Snedecor distribution.The evaluation focuses on the calculation and simulation verification of two key performance indexes,the average bit error rate(BER)and the outage probability under the binary phase-shift keying modulation.First,channel modeling is performed by integrating the Beaulieu-Xie dis-tribution and the Fisher-Snedecor distribution,based on the signa propagation characteristics,the mul-tipath effect and the influence of atmospheric fading for.Second,closed-form expressions for average BER and outage probability under binary phase-shift keying modulation are derived by using the pointing error,deterministic fading,and distribution models.Finally,simulations are conducted on MATLAB to evaluate the performance of the system under different parameter configurations.The results indicate that the decode-and-forward relay system has a smaller average BER and a smaller outage probability with the same signal-to-noise ratio.