Abstract
Classification of modulation scheme, previous step before demodulation, is the main part of an intelligent receiver at military or commercial application. Moreover, without definite parameters of the transmitted signal, blind modulation classification becomes a difficult task. Modulation classification becomes more challenging in real application with multicarrier modulation at fading channel. Furthermore, in recent years, the wireless communication has concerned to the orthogonal frequency division multiplexing (OFDM) because of spectral efficiency by using orthogonal multicarrier modulation. In this paper, we provided statistical characteristics of different modulation schemes from the OFDM signal with multipath (Rayleigh) fading channel. Based on standard of IEEE 802.16e, there are three possible modulation schemes used like a Quadrature Phase Shift Keying (QPSK), 16-QAM (Quadrature Amplitude Modulation), and 64-QAM. We analyzed those three modulation schemes by using statistical properties, such as, mean, variance, skewness, kurtosis and moment order.
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