FSK/PSK Modulated Coded Cooperation Systems

In this paper, coded user cooperation systems are integrated with combined frequency and phase modulation. Frequency/phase shift keying modulation defined over a signal set varying in both frequency and phase is a nonlinear constant envelope multidimensional modulation technique. Error performance of the proposed scheme is evaluated by computer simulations in quasi-static Rayleigh fading channels, for both full and selective cooperation cases. The selective cooperation is performed first by cyclic redundant check code control and then by threshold signal-to-noise control. Simulation results show that in all cases, frequency/phase shift keying modulation provides much better error performance than the conventional phase shift keying modulation in coded cooperation systems.