Simulated performance of satellite communication systems

Sample data simulations of two different nonlinear communication systems are discussed in this paper. The simulations utilize a simulation language structure known as SYSTID. A noncoherent binary frequency-shift keyed (FSK) system employing postdetection filtering was simulated. As an option, the FSK signal was allowed to be amplitude modulated (AM-FSK). The simulated results are shown to agree well with both analytical and experimental results. A quadri-phase phase-shift keyed (QPSK) channel was also simulated. Simulation of an adaptive transversal equalizer was found to effectively reduce the QPSK system degradation.