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In this letter, we consider the problem of nondata-aided (NDA) detection of multilevel pulse-amplitude-modulated (PAM) signals combined with energy detection. We show that it is possible to estimate proper thresholds for the symbol decision without using redundant signals. Furthermore, we present an analytical method to evaluate the effect of pattern noise on the error performance of the NDA scheme...
M-FSK modulation classification and identification of the modulation order are studied for both flat and frequency selective fading channels. In the modulation classification, M-FSK modulated signals are identified from M-PSK and M-QAM signals using amplitude and spectral features of the received signal. Once the M-FSK signal is identified, then the order of the signal is detected blindly. Various...
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