MPSK信号载波频率盲估计
doi: 10.3724/SP.J.1146.2006.01687
Blind Carrier Frequency Estimation for MPSK Signal
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摘要: 该文针对调制自动识别中,MPSK信号调制相制和训练序列未知的情况,提出了一种利用定时同步信号的差分相位有效识别MPSK信号相制M,并精确估计其载波频偏的方法。该算法不仅克服了调制制式不明对频偏估计的不利影响,还通过引入线性相位展开和高阶时延相关,大大提高了大频偏、低信噪比下估计的性能,对调制自动识别中MPSK信号的澄清和参数估计起到关键作用。Abstract: This paper considers recognition and estimation of carrier frequency from a time sampled MPSK signal in Automatic Modulation Recognition (AMR), when M and training symbol sequence are unknown. In this case, a new Non-Data-Aided (NDA) carrier frequency estimation algorithm is presented, after recognition of M. The introduction of linear phase unwrapping and high order correlation makes the new algorithm perform better than same traditional NDA carrier frequency estimation algorithms, when frequency offset is large or when the SNR is low. Simulation result shows this fact and it performs well in AMR system.
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