Performance of joint frequency phase modulation over Rayleigh fading channels

Joint frequency-phase modulation (JFPM) is a constant envelope digital modulation technique where both the frequency and phase of the signal are varied. The authors consider the problems of signal design, receiver structure, bandwidth efficiency and the probability of error performance with coherent or noncoherent detection of JFPM signals over Rayleigh fading channels. A noncoherent receiver for the JFPM signals is introduced, and an exact expression for the bit error rate is obtained. Error rate performance using diversity techniques in a Rayleigh fading channel is evaluated. Results show that JFPM performs better than conventional noncoherent M-ary FSK or M-ary DPSK of comparable bandwidth efficiency