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首先系统总结了高阶循环累积量估计载波频率的研究成果,从理论上推导出MASK、MPSK和MFSK信号的测频原理,并对平方降价法的性能进行了测试,指出了平方降阶法的局限性。然后以16QAM信号为例,从理论上证明此方法同样可以应用于MQAM的载波频率估计,并进行了仿真验证,从而扩展了此方法的适用范围。最后,进行了小结,指出测频方法存在的问题及解决方法。
Firstly, the research results of high-order cyclic cumulant estimation of carrier frequency are systematically summarized. The frequency-measuring principle of MASK, MPSK and MFSK signals is theoretically deduced. The performance of the quadratic reduction method is also tested. The square reduction method limitation. Then, taking 16QAM signal as an example, it is theoretically proved that this method can also be applied to the carrier frequency estimation of MQAM, and the simulation verification is carried out, thus extending the scope of application of this method. Finally, the summary is given, pointing out the problems existing in frequency measurement methods and solutions.