基于信号分解的MFSK信号码元速率估计算法

Algorithm for MFSK Symbol Rate Estimation Based on Signal Decomposition

针对MFSK信号码元速率估计问题,提出了一种基于信号分解的估计算法。算法将MFSK信号分解为M个单音信号的形式,利用信号的循环平稳特性,在所有单音信号包络和的频谱中提取MFSK信号码元速率对应的谱线,从而实现对MFSK信号码元速率的估计。该算法仅需将MFSK信号的频率集作为先验信息,同时允许信号含有载波频偏。经过理论分析可知,该算法在多径信道条件下同样适用。仿真实验表明,该方法在高斯信道下有良好的估计性能,在多径信道下性能损失很小,表现出良好的实用性和鲁棒性。

To estimate the symbol rate of MFSK signal,a new algorithm based on signal decomposition was presented.Under this algorithm,MFSK signal is decomposed into M single tones,and as a cyclostationary signal,the symbol rate is estimated by extracting the spectrum line corresponding to symbol rate in the spectrum of all the single tone envelopes.Frequency set is the only needed apriori knowledge,and frequency offset is allowed under this algorithm.Theore-tical analysis proves this algorithm is effective under multipath channel.Computer simulation results show that the algorithm is effective and robust which performs well under AWGN and has little SNR loss under multipath channel.