Journal of Radio Electronics. eISSN 1684-1719. 2025. ¹1
Full text in Russian (pdf)
DOI: https://doi.org/10.30898/1684-1719.2025.1.9
VECTOR ANALYSIS OF FSK SIGNALS
D.V. Kurganov 1,2, P.N. Zakharov 1,2, D.S. Demin 2
1 Faculty of Physics, M.V. Lomonosov Moscow State University
119991, Moscow, Leninskie Gory
2LLC «Microwave Electronics» (INWAVE)
119607, Moscow, Ramensky Boulevard, Building 1
The paper was received September 20, 2024.
Abstract. An algorithm for assessing the quality of an FSK signal has been developed, based on minimizing the square of the difference between the measured and reference signals with respect to distortion parameters. It is shown that the algorithm allows for the determination of such FSK signal parameters as carrier offset, deviation error, and carrier frequency drift. The process of vector analysis is studied, including preprocessing, demodulation, signal recovery, and correction. The algorithm’s performance is considered for both pure FSK signals and GFSK signals, as well as FSK with Gaussian filtering.
Key words: vector signal analysis, FSK, GMSK, Gaussian filtering.
Corresponding author: Kurganov Daniil Vladimirovich, kurganov.dv19@physics.msu.ru
References
1. R&S®FSW-K70, Vector Signal Analysis User Manual. Version 39 (FW: 6.00). URL: https://www.rohde-schwarz.com/cac/manual/r-s-fsw-k70-manuals_78701-29049.html
2. Keysight, Application Note Vector Signal Analysis Basics. URL: https://www.keysight.com/us/en/assets/7018-01220/application-notes/5989-1121.pdf
3. Schnyder F., Haller C. Implementation of FM demodulator algorithms on a high performance digital signal processor // Nanyang Technological University and Hochschule For Technik Rapperswil. – 2002.
4. Michael Rice. Digital Communications: A Discrete-Time Approach. Upper Saddle River, NJ: Prentice Hall, 2008.
5. Johnson Jr C.R., Sethares W.A., Klein A.G. Software receiver design: build your own digital communication system in five easy steps. – Cambridge University Press, 2011.
6. Švedek T., Herceg M., Matić T. A simple signal shaper for GMSK/GFSK and MSK modulator based on sigma-delta look-up table // Radioengineering. – 2009. – Ò. 18. – ¹. 2.
7. Chang D.C., Shiu T.H. Digital GFSK carrier synchronization // APCCAS 2006-2006 IEEE Asia Pacific Conference on Circuits and Systems. – IEEE, 2006. – Ñ. 1523-1526.
8. Watson B. FSK: signals and demodulation // Watkins–Johnson Company Tech–notes. – 1980. – Ò. 7. – ¹. 5.
9. Kennedy G., Davis B., Prasanna S. R. M. Electronic communication systems. – Tata McGraw-Hill Publishing Co. Ltd., New Delhi, 1985. – Ò. 20. – Ñ. 21.
10. System for spectral, temporal, and vector analysis of radiofrequency signals and channels (PNR-10) // ISTINA: List of Scientific Equipment. URL: https://istina.msu.ru/equipment/card/10360756/
11. System for spectral, temporal, and vector analysis of radiofrequency signals and channels // ISTINA: List of Scientific Equipment. URL: https://istina.msu.ru/equipment/card/10359726/
12. Vector signal analyzer Rohde&Schwarz FSW43 // ISTINA: List of Scientific Equipment. URL: https://istina.msu.ru/equipment/card/538141782/
For citation:
Kurganov D.V., Zakharov P.N., Demin D.S. Vector analysis of FSK signals. // Journal of Radio Electronics. – 2025. – ¹. 1. https://doi.org/10.30898/1684-1719.2025.1.9 (In Russian)