基于HOUGH变换的QPSK信号盲处理结果可信性评估

本文研究了QPSK信号盲处理结果的可靠性检验问题，提出了一种基于HOUGH变换的检验算法。该方法可在缺乏信号先验知识的条件下，利用盲处理结果并根据调制识别结果对应的信号模型构造辅助信号，将辅助信号与观测信号相关累加。在分析不同可信性假设下相关累加模值曲线特征的基础上，通过对HOUGH变换极值点聚类数是否为1的检验，来实现对信号盲处理的可信性检验。计算机仿真结果表明，本算法在较低信噪比条件下，可实现对QPSK信号盲处理结果的可信性校验。

Research on Reliability Test for Blind Processing Results of QPSK Signals Using Hough Transformation

In this paper, we study the reliability test of the QPSK signal processing results, and propose an algorithm based on HOUGH transform. In the absence of a priori knowledge of the signal, by constructing an auxiliary signal based on the blind signal processing results and the signal model corresponding to identified modulation type, the correlation sum between the original observed signal and the auxiliary signal is obtained. Based on the analysis of the characteristics of the correlation modulus curve under different credibility assumptions, the reliability test of blind signal processing is realized by the test of whether the cluster number of the peaks of the HOUGH transformaton is 1. The computer simulation results show that the proposed algorithm can achieve the credibility of the blind processing of QPSK signal under low SNR conditions.