信号处理2025，Vol.41Issue(3)：472-483,12.DOI:10.12466/xhcl.2025.03.005
基于谱特征分析的BPSK信号关键参数估计方法
Key Parameters Estimation Method of BPSK Signal Based on Spectral Analysis
摘要
Abstract
To address the challenge of estimating key parameters of a root-raised cosine pulse-shaped Binary Phase Shift Keying(BPSK)signal in non-cooperative communication,the signal is innovatively modeled as a periodic modulation signal.A necessary analysis of the singular value decomposition results of the segmented observation matrix for the peri-odic modulation signal was conducted,clarifying the structural characteristics of singular value decomposition in both mono-component and multi-component cases.Based on this analysis and leveraging the characteristics of the signal it-self,new methods were proposed for estimating key parameters such as symbol rate,carrier frequency,roll-off coeffi-cient,and delay.First,by analyzing the power spectrum and its histogram of the received signal and utilizing the con-stant noise power spectrum,a rough estimation of the symbol rate and carrier frequency of the signal was achieved.Based on this,the Chirp-Z transform spectrum of the squared signal was analyzed to obtain a more precise carrier fre-quency estimate.A novel approach was introduced to obtain the normalized waveform of the root-raised cosine pulse by utilizing the power spectrum of the signal,effectively eliminating the influence of the carrier frequency on the estima-tion of the roll-off coefficient estimation.Second,an analysis of the envelope spectrum revealed distinct spectral lines at integer multiples of the symbol rate,enabling an accurate estimate of the symbol period.Waveform similarity measure-ment indicators combined with the estimation of the normalized waveform of the root-raised cosine pulse were intro-duced to estimate the roll-off coefficient for the first time.Finally,based on the periodic modulation signal model,a dy-namic delay-segmented observation matrix was designed to analyze the segmentation of the basic waveform of the root-raised cosine pulse under different delay conditions.The proposed improved singular value ratio spectrum was then em-ployed to achieve an accurate estimation of the signal reception delay.Simulation results demonstrate that the proposed method achieves high estimation accuracy.关键词
根升余弦脉冲/二进制相移键控/参数估计/功率谱/包络谱/动态延迟分段观测矩阵/奇异值比谱Key words
root-raised cosine pulse/binary phase shift keying signal/parameters estimation/power spectrum/enve-lope spectrum/dynamic delay segmentation observation matrix/singular value ratio spectrum分类
信息技术与安全科学引用本文复制引用
朱航,邹晓鋆,谭铭,许旭光,韩立珣,宋伟..基于谱特征分析的BPSK信号关键参数估计方法[J].信号处理,2025,41(3):472-483,12.基金项目
国家自然科学基金(62201579,62201580) The National Natural Science Foundation of China(62201579,62201580) （62201579,62201580）
