NEW DIFFERENTIAL SIGNAL-CODE CONSTRUCTIONS WITH INTERNAL CPM SIGNALS

Abstract

In the article the algorithm and programs for the exhaustive search of differential signalcode constructions (DSCC) for slow fading channels are developed. The generating polynomials of optimal codes are found. A methodology for comparing the characteristics of new DSCC with the characteristics known from sources has been developed. The values of the free distance found by the DSCC significantly exceed the analogs known from the literature where a coherent demodulation method is assumed, which excludes the possibility of using the results of that work in channels with fading and phase distortion. The resulting new differential signal-code constructions may be used in quasi-stationary channels with slow fading.