应用科技
應用科技
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YING YONG KE JI
2015年
4期
37-42
,共6页
邢添翔%窦峥%金子靖%林云
邢添翔%竇崢%金子靖%林雲
형첨상%두쟁%금자정%림운
参数估计%希尔伯特-黄变换%载波频率%相位编码信号
參數估計%希爾伯特-黃變換%載波頻率%相位編碼信號
삼수고계%희이백특-황변환%재파빈솔%상위편마신호
parameter estimation%HHT%carrier frequency%phase-coded signal
在非协作通信系统中,信号解调需要对载波频率进行估计。提出了一种结合信噪比估计的希尔伯特-黄变换(Hilbert-Huang transform,HHT)的载波频率估计方法,通过信噪比合理选择固有模态分量( intrinsic mode function,IMF)对信号进行时域滤波,再求边际谱来估计载波频率,并与其他几种方法进行比较。仿真结果表明,在信噪比低于-5 dB时,文中提出的相位调制信号( phase shift keying,PSK)载频估计方法,归一化均方根误差小于10-1,相对误差小于5%,优于其他方法。
在非協作通信繫統中,信號解調需要對載波頻率進行估計。提齣瞭一種結閤信譟比估計的希爾伯特-黃變換(Hilbert-Huang transform,HHT)的載波頻率估計方法,通過信譟比閤理選擇固有模態分量( intrinsic mode function,IMF)對信號進行時域濾波,再求邊際譜來估計載波頻率,併與其他幾種方法進行比較。倣真結果錶明,在信譟比低于-5 dB時,文中提齣的相位調製信號( phase shift keying,PSK)載頻估計方法,歸一化均方根誤差小于10-1,相對誤差小于5%,優于其他方法。
재비협작통신계통중,신호해조수요대재파빈솔진행고계。제출료일충결합신조비고계적희이백특-황변환(Hilbert-Huang transform,HHT)적재파빈솔고계방법,통과신조비합리선택고유모태분량( intrinsic mode function,IMF)대신호진행시역려파,재구변제보래고계재파빈솔,병여기타궤충방법진행비교。방진결과표명,재신조비저우-5 dB시,문중제출적상위조제신호( phase shift keying,PSK)재빈고계방법,귀일화균방근오차소우10-1,상대오차소우5%,우우기타방법。
In a non-cooperative communication system, it is necessary to estimate the carrier frequency for blind sig-nal demodulation.In combination with SNR estimation, this paper proposes a carrier frequency estimation method based on Hilbert-Huang transform, and compares it with several other methods.It chooses intrinsic mode function component properly for time domain filtering under SNR estimation, and then estimates carrier frequency by margin-al spectrum.The simulation results show that when the SNR is lower than -5 dB, the normalized root mean square error is less than 10-1 and relative error is less than 5%, which illustrates that the proposed method of PSK carrier frequency estimation works better than the others.