Uncoded diversity sum performance of FH/CPFSK in partial-band jamming

A performance analysis is presented for a slow-hopped continuous-phase FSK system subject to thermal noise plus partial-band noise jamming. The authors evaluate the effectiveness of a proposed antijam technique consisting of repeating the bit sequence L times, on different hops. At the receiver the L analog data sample values for each bit decision are given by the polarity of this sum. It is shown that a diversity gain is not realized by the system.<>