Abstract
The exponential growth in the volume of transmitted data necessitates the development of efficient methods for signal processing and analysis, particularly under conditions of a priori uncertainty. This paper presents a novel method for estimating carrier frequency and initial phase offsets in quadrature amplitude modulation (QAM) signals based on cumulant analysis. The method leverages the properties of fourth-order cumulants, which are invariant to phase shifts. An algorithm is developed that enables accurate determination of carrier frequency and initial phase values for QAM signals in the absence of a priori information about signal parameters. Experimental results demonstrate the high accuracy and efficiency of the proposed method in radio monitoring and radio frequency spectrum analysis applications.
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