Digital Demodulator of the Second-Order DPSK Signals

A digital non-coherent demodulator of the second-order binary differential phase-shift keyed signals is considered. Such demodulator provides noise immunity close to coherent demodulation, but does not require phase locking of the reference generator signal with the received signal. The responses of the quadrature signal processing channels are studied, with the noise immunity of the demodulator under the influence of a white noise. The statistical simulation of the demodulator operation is carried out. It is shown that in the demodulator, due to the generation of four samples per carrier period, quadrature signal processing is simply hardware-implemented. It is noted that the presented demodulator is characterized by its own frequency selectivity and provides classic optimal PSK signal processing. #COMESYSO1120.