DESIGN AND ANALYSIS OF A FAST FREQUENCY-HOPPED DBPSK COMMUNICATION-SYSTEM .1. SYSTEM DESCRIPTION AND HOP TIMING TRACKING LOOP ANALYSIS

The purpose of this two-part paper is to present the design and perfor mance analysis of a fast frequency-hopped (FFH) spread spectrum commun ication system employing differential binary phase shifted keying (DBP SK) modulation and differentially coherent demodulation. The receiver utilizes a hop timing tracking loop to ''lock'' the hop clock. Through this tracking loop, the differentially coherent demodulation of an FF H signal is made possible. In Part I of this paper, we first present t he system model of an FFH/DBPSK system. Digital, full-time, early-late gate timing error estimator is investigated. The tracking loop is sho wn to be a Markov chain and various performance characteristics of the tracking loop are studied.