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Journal Radioengineering №5 for 2024 г.
Article in number:
Serial analog QAM modems based on complex band-pass filters with LF Bessel prototypes
Type of article: scientific article
DOI: https://doi.org/10.18127/j00338486-202405-16
UDC: 621.38
Keywords: Analog complex band pass filter amplitude-frequency response infinite impulse response phase-frequency response quadrature amplitude modulation serial QAM modem
Authors:

Y.A. Grebenko1, R.I. Polyak2, Yan Lin Paing3

1-3 National Research University (NRU) “MPEI” (Moscow, Russia)

1 GrebenkoYA@mpei.ru; 2 poliakri@mpei.ru; 3 hlainff@gmail.com

Abstract:

The article is devoted to the development and implementation of algorithms for quadrature amplitude modulation and demodulation based on analog complex band pass filters with low-frequency Bessel prototypes. The use of complex Bessel filters makes it possible to obtain orthogonal carrier signals close in shape to symmetric signals with practically non-overlapping spectra.

Overview of the development and implementation of a serial QAM modem based on analog complex band-pass Bessel filters.

The procedure for obtaining the expression for the impulse response of analog complex band-pass Bessel filters is considered. With the help of circuit simulation, the frequency response and impulse response of such a filter are determined. The choice of the center frequency is carried out by setting two coefficients.

A block diagram of a serial data transmission system with quadrature amplitude modulation (QAM) based on analog complex band-pass Bessel filters is proposed. The results of its circuit simulation in the Micro-Cap environment are presented.

Pages: 136-143
For citation

Grebenko Y.A., Polyak R.I., Yan Lin Paing. Serial analog QAM modems based on complex band-pass filters with LF Bessel prototypes. Radiotekhnika. 2024. V. 88. № 4. P. 136−143. DOI: https://doi.org/10.18127/j00338486-202405-16 (In Russian)

References
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  2. Grebenko Ju.A., Aung Ko Min. Proektirovanie kompleksnyh polosovyh fil'trov na baze programmiruemyh analogovyh integral'nyh shem. Jelektrosvjaz'. 2020. № 8. S. 71-74 (in Russian).
  3. Grebenko Ju.A., Chzho Zej Ja. Kompleksnye aktivnye RC fil'try na identichnyh zven'jah. Radiotehnika. 2008. № 2. S. 61-64 s. (in Russian).
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Date of receipt: 06.02.2024
Approved after review: 12.02.2024
Accepted for publication: 29.04.2024