航天电子对抗
航天電子對抗
항천전자대항
AEROSPACE ELECTRONIC WARFARE
2012年
3期
59-61
,共3页
调制识别%特征函数%复信号%改进
調製識彆%特徵函數%複信號%改進
조제식별%특정함수%복신호%개진
modulation classification%characteristic function%complex signal%mend
原有的基于特征函数的调制识别算法，是将基带信号的同相分量和正交分量之和代入特征函数进行运算，计算过程丢失了部分有用信息，仅能保证特征函数的相位跟高斯白噪声无关。提出一种新方法，将基带信号以复数形式代入特征函数进行运算，不仅没有丢失信号的有用信息，并且从理论上证明计算结果跟高斯白噪声无关，继而可以使用特征函数的幅度信息对信号的调制方式进行识别。仿真证明，该算法比原有方法在识别性能上有大幅提高。
原有的基于特徵函數的調製識彆算法，是將基帶信號的同相分量和正交分量之和代入特徵函數進行運算，計算過程丟失瞭部分有用信息，僅能保證特徵函數的相位跟高斯白譟聲無關。提齣一種新方法，將基帶信號以複數形式代入特徵函數進行運算，不僅沒有丟失信號的有用信息，併且從理論上證明計算結果跟高斯白譟聲無關，繼而可以使用特徵函數的幅度信息對信號的調製方式進行識彆。倣真證明，該算法比原有方法在識彆性能上有大幅提高。
원유적기우특정함수적조제식별산법，시장기대신호적동상분량화정교분량지화대입특정함수진행운산，계산과정주실료부분유용신식，부능보증특정함수적상위근고사백조성무관。제출일충신방법，장기대신호이복수형식대입특정함수진행운산，불부몰유주실신호적유용신식，병차종이론상증명계산결과근고사백조성무관，계이가이사용특정함수적폭도신식대신호적조제방식진행식별。방진증명，해산법비원유방법재식별성능상유대폭제고。
In existing modulation classification algorithm based on characteristic function, a real number which is usually the sum of the signal in-phase component and quadrature component is taken into the formula. In this process some signal information is lost, though the phase of characteristic function is insensitive to the white Gaussian noise. A new algorithm is proposed for calculating the characteristic function, which takes the complex baseband signal into the formula directly. This process does not lose any signal information. It is proved that the proposed characteristic function is insensitive to the white Gaussian noise, so the amplitude of the characteristic function can be used for modulation classification. Simulation result shows that the recognition performance is the improved remarkably.
