Abstract

In adaptive modulation systems, the receiver should identify the modulation employed at the transmitter. This paper presents a new modulation classification method based on amplitude moments and correlation between subcarriers in Orthogonal Frequency Division Multiplexing (OFDM) systems. In the OFDM systems, a frequency offset causes inter-carrier interference (ICI), and the amplitude moments of received signal include ICI components. The proposed method estimates and removes the ICI components using the correlation between subcarriers. Simulation results of classification error probability show that the proposed method is robust to frequency offset.

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