一种低信噪比下基于弱相关性的信号检测方法  

A Weak Correlation-based Signal Detection Method for Low SNR

作　　者：郭芥铭 黄子涛 吴熙 彭明[1] GUO Jieming;HUANG Zitao;WU Xi;PENG Ming(Beijing Orient Institute of Measurement and Test,Beijing 100086,China)

机构地区：[1]北京东方计量测试研究所,北京100086

出　　处：《通信技术》2024年第12期1318-1323,共6页Communications Technology

摘　　要：针对现有信号检测算法在低信噪比下性能受限的问题,提出了一种基于弱相关性的信号检测方法。首先,分析了能量检测和相关检测在低信噪比下性能受限的原因;其次,介绍了该方法的检测原理;最后,对该方法进行验证,并对比了3种方法的检测概率。实验结果表明,针对正交相移键控(Quadrature Phase Shift Keying,QPSK)信号,在信噪比低至-5 dB时,该方法的信号检测概率超过80%。与能量检测算法相比,检测概率提升了约50%;与相关检测算法相比,检测概率提升了10%~20%。To address the problem of performance limitation of existing signal detection algorithms under low SNR(Signal-To-Noise Ratio),this paper proposes a signal detection method based on weak correlation.First,it analyzes the reasons for the performance limitations of energy detection and correlation detection under low SNR.Then,it introduces the detection principle of the proposed method.Finally,it validates the method and compares the detection probabilities of the three methods.Experimental results indicate that for QPSK(Quadrature Phase Shift Keying)signals,when the SNR is as low as-5 dB,the signal detection probability of the method exceeds 80%.Compared to the energy detection algorithm,the detection probability is improved by about 50%;compared to the correlation detection algorithm,the detection probability is improved by 10%to 20%.

关 键 词：低信噪比 噪声弱相关性 信号检测 

分 类 号：TN911.7[电子电信—通信与信息系统]