针对面向载波聚合的滤波器组多载波(filter bank multicarrier,FBMC)系统中所存在的多频偏问题,提出一种适用于该系统的多频偏联合估计方法.根据FBMC系统符号重叠特性,每个分量载波上均采用训练序列构造周期性输出信号区间,依据多重信号特征分解理论,对输出信号区间协方差矩阵进行特征分解,通过构造频偏谱函数并进行峰值搜索得到多个频偏估计值,结合互相关函数完成多个频偏估计值分配过程.仿真结果表明,采用所提算法总体上可以将频偏估计的均方根误差控制在10-3左右.因此,该算法可以有效解决面向载波聚合的FBMC系统多频偏估计问题.%Confronted with the multiple carrier frequency offsets (CFOs) in FBMC system with carrier aggregation,this paper presented an effective method to estimate the CFOs of this system.According to the overlapping of symbols in this system,it constructed periodical intervals of output signal with preamble sequence on each component carriers.Based on the multiple signal decomposition theory,this paper constructed the spectral function of frequency offsets and search for the peak value of this spectrum function,to estimate the CFOs of those component carriers by decomposition of the covariance matrix of the output signal intervals on eigen value.And it used cross-correlation function of signal to complete the mapping and distribution of the CFOs between multiple component carriers.Simulation results show that the RMSE (root mean square error) of CFOs estimation can be controlled at 10-3.It means that the method can effectively estimate the CFOs in this system.
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