Performance of phase comparison sinusoidal frequency shift keying

The bit error performance of phase comparison sinusoidal frequency shift keying (PCSFSK) in the presence of white Gaussian noise is discussed. In a comparison of the performance of PCSFSK with DQPSK, it is found that PCSFSK performs slightly better than an upper bound on the performance of DQPSK at high signal-to-noise ratios, and somewhat worse at low signal-to-noise ratios. Attention is given to a description of the received PCSFSK signal, the receiver structure, the PCSFSK decision space for two formats, and a graph showing the white noise performance of PCSFSK compared to optimum reception of QPSK and DQPSK.