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Spectrum of a Complex Signal with Incorrect Quadrate Components

  • THEORY AND METHODS OF SIGNAL PROCESSING
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Abstract

The question of the formation of quadrature components of a coherent signal processing system, represented by two channels shifted by 90° reference voltages, is considered. The effect of almost inevitable amplitude and phase mismatches of quadrature channel parameters on the frequency properties of a complex signal is studied. Expressions are obtained for the spectral density of a complex signal in the case of inequality of channel transmission coefficients and difference from a 90° phase shift of reference voltages during conversion to video frequency of high-frequency input radio signals. It is shown that the deviation of the transmission coefficients and the phase mismatch of the quadrature channels of the coherent system leads to the appearance of an additional real component in the output signal the level of which is determined by the deviation of the transmission coefficients of the quadrature channels and the value of the phase mismatch of the reference voltages.

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Authors and Affiliations

  1. St. Petersburg State University of Aerospace Instrumentation, 190000, St. Petersburg, Russia

    S. I. Ziatdinov

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  1. S. I. Ziatdinov
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Correspondence to S. I. Ziatdinov.

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Ziatdinov, S.I. Spectrum of a Complex Signal with Incorrect Quadrate Components. J. Commun. Technol. Electron. 67, 632–635 (2022). https://doi.org/10.1134/S1064226922060213

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  • DOI: https://doi.org/10.1134/S1064226922060213

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