太赫兹科学与电子信息学报
太赫玆科學與電子信息學報
태혁자과학여전자신식학보
Information and Electronic Engineering
2013年
6期
964-969
,共6页
调制识别%APSK信号%信噪比估计%循环累积量
調製識彆%APSK信號%信譟比估計%循環纍積量
조제식별%APSK신호%신조비고계%순배루적량
modulation recognition%APSK%signal to noise ratio estimation%cyclic cumulant
针对高阶幅度相移键控(APSK)信号在卫星通信中的应用，提出了一种识别数字调相信号的新方法。在信噪比估计的基础上，利用信号包络的统计特征对 MPSK,MQAM,16APSK 和32APSK信号进行区分。理论推导和实验仿真验证了该统计特征具有对加性高斯白噪声和滚降系数不敏感的特性。根据鲁棒性较好的四阶循环累积量提出一种新的特征参数Q以实现MPSK和MQAM信号的类内识别。仿真表明，当信噪比达到5 dB时，该方法拥有较好的识别率(>95%)。
針對高階幅度相移鍵控(APSK)信號在衛星通信中的應用，提齣瞭一種識彆數字調相信號的新方法。在信譟比估計的基礎上，利用信號包絡的統計特徵對 MPSK,MQAM,16APSK 和32APSK信號進行區分。理論推導和實驗倣真驗證瞭該統計特徵具有對加性高斯白譟聲和滾降繫數不敏感的特性。根據魯棒性較好的四階循環纍積量提齣一種新的特徵參數Q以實現MPSK和MQAM信號的類內識彆。倣真錶明，噹信譟比達到5 dB時，該方法擁有較好的識彆率(>95%)。
침대고계폭도상이건공(APSK)신호재위성통신중적응용，제출료일충식별수자조상신호적신방법。재신조비고계적기출상，이용신호포락적통계특정대 MPSK,MQAM,16APSK 화32APSK신호진행구분。이론추도화실험방진험증료해통계특정구유대가성고사백조성화곤강계수불민감적특성。근거로봉성교호적사계순배루적량제출일충신적특정삼수Q이실현MPSK화MQAM신호적류내식별。방진표명，당신조비체도5 dB시，해방법옹유교호적식별솔(>95%)。
A new algorithm for automatic classification of digital phase modulated signals is proposed aiming for the application of high-order Amplitude Phase Shift Keying(APSK) signals in satellite communication. The algorithm utilizes signal envelope statistical feature to distinguish MPSK, MQAM, 16APSK and 32APSK based on the SNR estimation. Nevertheless, it is proved that this statistical feature parameter is insensitive to additive Gaussian noise and the roll-off factor of the pulse shaping filter by theoretical deduction and simulation experiments. Therefore a new statistical parameter Q is proposed according to four-order cyclic cumulant which is robust to the presence of carrier frequency offsets, time delay and phase offsets. {QPSK 8PSK} and {16QAM 32QAM} can be classified based on the parameter Q. Simulation results show that the proposed recognition algorithm can obtain high probability of correct identification(>95%) when the SNR is above 5 dB.
