DEVELOPMENT OF A DIGITAL ALGORITHM FOR DEMODULATING SIGNAL WITH THE SECOND ORDER DIFFERENTIAL PHASE-SHIFT KEYING
Introduction. Currently, radio communication systems that employ phase-shift keying and differential phase-shift keying have high noise immunity and are widely used in radio engineering. Specialized and universal computing systems are widely employed in designing state-of-the-art digital radio receivers to perform signal processing. The hardware components of such systems implement fast digital signal processing algorithms. Current signal processing algorithms with differential phase-shift keying are difficult to implement. However, they ensure potential noise immunity and are insensitive to random phase variations and random frequency shifts caused by the Doppler effect. The aim of the research is the development and study of the digital algorithm for demodulating signal with the second order differential phase-shift keying. Research methods. In order to solve the problem, we used analytical and computational methods of the signal processing theory, mathematical analysis and digital signal processing, numerical methods, computer programming and modeling methods. Mathcad framework was employed to carry out and document engineering and scientific calculations. Conclusions. A fast digital algorithm for demodulating signals with the second order differential phase-shift keying was developed. It allows to use the minimum number of simple arithmetic operations for each period of the signal being processed. Practical implications. Research outcomes can be applied to improving algorithms for demodulating signal with the second order differential phase-shift keying, applied, in particular, in the radio communication systems. For the algorithm we received a certificate of state registration No. 2019617675 in the Register of Computer Programs issued by the Federal Service for Intellectual Property of the Russian Federation. The date of state registration is June 18, 2019.