Differential Detection of Narrow-Band Binary FM

In this paper we consider differential detection of narrowband binary FM, using a detector which utilizes a delay line whose delay period is dependent on the value of the modulation index. The error-rate performance is computed for this receiver and compared with that of the limiter-discriminator receiver. In contrast to the previously published results for one-bit delay differential detection, it is shown that variable delay differential detection yields performance comparable to limiterdiscriminator detection.