V.V. Kiryushkin1, S.I. Babusenko2, A.V. Zhuravlev3, I.V. Shuvaev4

1-4 JSC RIE “PROTEK” (Voronezh, Russia)

Problem statement. At present, broadband radio engineering systems based on the use of phase shift keyed (PSK) signals have found wide application. However, under the influence of various destabilizing factors during the transmission and reception of PSK signals, a frequency detuning occurs in the transmitter and receiver. It does not allow increasing the time of coherent accumulation of the PSK signal in the receiver and, as a result, leads to a decrease in its noise immunity.

Purpose. To develop a way to compensate for the frequency detuning that occurs in the transmitter and receiver of the PSK signals, which makes it possible to increase the time of coherent signal accumulation in the receiver and increase the signal-to-noise ratio at its output.

Results. A method for correcting the frequency detuning that occurs in the transmitter during the formation and transmission of PSK signals and in the receiver when these signals are received has been developed. The method is based on a preliminary maximum likelihood estimate of the magnitude of the frequency detuning, which is refined using the values of the phase shift between two successively received complex PSK signals. The method does not require an increase in the number of channels in the structure of the receiver and allows you to increase the time of coherent signal accumulation in the receiver in order to increase its noise immunity.

Practical significance. The use of the developed frequency correction method in the example with a frequency detuning of 500 Hz made it possible to increase the noise immunity of the stationary transmitter-receiver system up to 8 dB.

Kiryushkin V.V., Babusenko S.I., Zhuravlev A.V., Shuvaev I.V. Compensation for the frequency detuning that occurs in the transmitter and receiver of phase shift keyed signals. Radiotekhnika. 2023. V. 87. № 7. P. 23−31. DOI: https://doi.org/10.18127/j00338486-202307-03 (In Russian)

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