Interference immunity of biorthogonal M-dimensional signal design in Gaussian channel

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Abstract

The choice of modulation type for radio systems intended for operation in absence of strict limitations to the occupied frequency range is considered. For such systems the use of multi-position frequency shift keying (M-FSK), which has high energy efficiency and low value of the radiated signal peak factor is proposed. An analysis of the fundamental features of M-FSK manipulation, which has high energy efficiency, is presented. The results of modelling of transmission channel noise immunity for different values of modulation index and multiplicity, as well as the corresponding spectral characteristics are presented. Recommendations on improving of systems with M-FSK are developed.

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About the authors

M. M. Medvedev

МТУСИ

Author for correspondence.
Email: med.mikhail2012@ya.ru

магистрант

Russian Federation

S. S. Shavrin

МТУСИ

Email: sss@mtuci.ru

д.т.н., профессор кафедры МТС

Russian Federation

References

  1. Proakis J.G., Salehi M. Digital Communications. 5th Edition. New York: McGraw-Hill, 2008.
  2. Welch P.D. The Use of Fast Fourier Transform for the Estimation of Power Spectra: A Method Based on Time Averaging Over Short, Modified Periodograms // IEEE Transactions on Audio and Electroacoustics. 1967. Vol. 15. PP. 70−73.
  3. SklarB. Digital Communications: Fundamentals and Applications. Upper Saddle River, NJ: Prentice-Hall, 2001.
  4. Dan E.D., Russell M.M. Multidimensional Digital Signal Processing. Englewood Cliffs, NJ: Prentice-Hall. 1984.

Supplementary files

Supplementary Files
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2. Fig. 1. Dependence of the values ​​of the in-phase and quadrature components (I/Q data) for the 2-FSK signal on time

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3. Fig. 2. Spectrogram of the 8-FSK signal

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4. Fig. 3. Waterfall curves for different keying indices of 8-FSK

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5. Fig. 4. a – dependence of BER on the keying index h for 16-FSK; b – dependence of BER on the keying index h for 64-FSK

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6. Fig. 5. Spectral power density and its root-mean-square values ​​for M-FSK keying (M = 2, 4, 8, 16)

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7. Fig. 6. Waterfall curves for different keying orders (M = 2…256)

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8. Fig. 7. Waterfall curves for different frequency detuning of 4-FSK (Foff = 0…0.5 Fsep)

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Copyright (c) 2024 Medvedev M.M., Shavrin S.S.