A modulation classifier for multi-channel systems and multi-transmitter situations

This paper presents a modulation classifier that is designed to handle multi-channel systems and situations where several digitally modulated signals are mixed. This is accomplished by dividing the analyzed signal into individual components. The signal components are located via a smoothed amplitude spectrum and individually classified by a single tone classifier that can handle CW, ASK, BPSK, and QPSK signals. FSK signals can also be handled since they are divided into two peaks, which are separately classified. Each peak in an FSK signal will be an ASK signal. The FSK signal is thus classified as two ASK signals, and by analyzing their correlation it can be established that they form an FSK signal.<>