Comparative Analysis and Ways of Improvement of Noise Immunity of Demodulation of OQPSK Signals
The possibility of engineering implementation of receiving radio signals with multiple shift keying at low signal-to-noise ratio is considered in this paper. Method of improving the detection realized by modifying the PLL device with the system of narrowband filters. Characteristics of filters are selected in such a way as to increase the noise immunity of the detector without changing its dynamic characteristics. The results of simulation showed a higher efficiency of the modified PLL in comparison with classical devices in a low ratio of signal-to-noise ratio.