Discriminator Detection of Wide-Band PCM/FM

The performance of discriminator detection of wide-band PCM/FM is investigated. Formulas are derived that allow one to predict system performance with the effects of both predetection and postdetection filtering accounted for. In particular, for a postdetection equivalent noise bandwidthbit time product b0T=2, it is shown that best results are obtained with a modulation index ß=0.6. Furthermore, it is shown that performance to within 1.5 dB of theoretical can be obtained.