CAJ | 학술논문

针对常见的恒包络数字通信信号,对其信号二次方与四次方形式的傅立叶谱线特征进行了理论分析,并在此基础上提出了一种针对恒包络数字通信信号的调制方式识别方法,其主要特点是不需要符号速率、载波初相、定时同步等先验信息,而且还能够区分线性调制和非线性调制.仿真实验表明该方法在较低信噪比条件下仍可以获得较高的正确识别率,具有很强的实用性.
침대상견적항포락수자통신신호,대기신호이차방여사차방형식적부립협보선특정진행료이론분석,병재차기출상제출료일충침대항포락수자통신신호적조제방식식별방법,기주요특점시불수요부호속솔、재파초상、정시동보등선험신식,이차환능구구분선성조제화비선성조제.방진실험표명해방법재교저신조비조건하잉가이획득교고적정학식별솔,구유흔강적실용성.
Spectrum line feature of the constant modulus digital modulation signals was investigated.Based on spectrum line feature,a novel modulation classification approach for constant modulus digital modulation signals was proposed.The proposed approach doesn't need the prior knowledge of symbol rate,carrier phase,timing recovery,and so on,and can classify linear and nonlinear digital modulation schemes.Simulation results illustrated that the proposed approach could achieve satisfying classification performance even when the SNR was lower,which showed its feasiblility and practicality.