Performance of Noncoherent FSK and AM-FSK Systems with Postdetection Filtering

The performance of a noncoherent frequency-shift keying (FSK) system employing postdetection filtering is determined. The FSK pulses are allowed to be amplitude modulated (AM-FSK) and the postdetection filter is allowed to be arbitrary. The analysis for the general case will be shown to simplify the previously known results when the AM is removed and the postdetection filter is an integrate-and-dump. The numerical results will take into account the effects of intersymbol interference. Both computer simulation results and experimental results will be presented and will be shown to agree quite closely with the analysis.