ANALYSIS OF THE PARAMETRIC SENSITIVITY
OF THE METHOD FOR OPTIMIZING THE STRUCTURE
OF SPECTRALLY EFFECTIVE RADIO SIGNALS
Sergei S. Pechnikov, Voronezh Institute of the Ministry of Internal Affairs of Russia, Voronezh, Russia, firstname.lastname@example.org
Sergey A. Sherstyukov, Voronezh Institute of the Ministry of Internal Affairs of Russia, Voronezh, Russia, email@example.com
Currently, increasing the speed of information transmission in wireless communication networks is a topical issue. The growing demand for spectral efficiency in radio communication systems gives rise to the introduction of signals with amplitude-phase modulation. Despite all its advantages, signals with vector modulation are characterized by a change in the envelope, which makes it impossible to use highly efficient nonlinear power amplifiers. Energy efficiency is clearly a critical factor in portable radio communications systems, where power supplies are often used in small packages, and the presence of energy losses due to heat dissipation is a significant drawback that requires additional cooling systems. In this connection, when developing modern radio communications, radio engineers are faced with the contradictory task of achieving maximum energy and spectral efficiency. One of the approaches to reduce nonlinear distortion of vector modulation is the use linearization schemes for nonlinear power amplifiers. This work is devoted to increasing the energy and spectral efficiency of signals with amplitude-phase modulation. The article discusses the restrictions imposed on the input signals for the method for optimizing of structure of spectrally effective radio signals with vector modulation, the formation of the output signal, the influence of phase shifters phase imbalance on p/2, the index of balance modulation, and the analysis of parametric sensitivity. The possibility of using quadrature modulators to form components with phase modulation and constant envelope is considered. This method was simulated and the effect of phase imbalance on the shape of the output signal constellation was revealed.
Keywords: digital radio communication, signals with high spectral efficiency, linearization of power amplifiers, phase imbalance, constant envelope.
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Information about authors:
Sergey S. Pechnikov, post-graduate cadet of Voronezh Institute of Russian Ministry of Internal Affairs, Voronezh, Russia
Sergey A. Sherstyukov, doctor of technical sciences, assistant professor, professor of the chair infocommunication systems and technologies at Voronezh Institute of the Ministry of Internal Affairs of Russia, Voronezh, Russia