Optimum estimation and filtering of the ionospheric channel dispersion characteristics slope algorithms

Lobov, E. M.; Smerdova, Elizaveta O.; Kandaurov, N. A.; Kosilov, Iliya S.; Elsukov, Boris A.

doi:10.1109/sinkhroinfo.2017.7997537

Cited by 11 publications

(2 citation statements)

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“…Modern development of HF communication systems is aimed at increasing the information transmission rate by increasing the frequency band used [1][2][3][4]. When receiving signals with an extended spectrum, it becomes necessary to take into account the influence of the frequency dispersion of the ionospheric channel, since it leads to significant distortions of the signal and a decrease in the quality of information reception in general [5][6][7]. An actual problem is to assess the parameters of the frequency dispersion of the ionospheric channel and develop algorithms and devices for compensating for dispersion distortion of wideband signals [8][9][10][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Wideband HF signals dispersion distortion compensator based on digital filter banks. Theory and approbation

Chirov¹

2020

T-Comm

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The article proposes a computationally effective scheme of the dispersion distortions compensation device, based on the modification of the classical 2M-channel digital filter banks. The main idea of dispersion compensation is equalization of the delay and elimination of the phase shift, because the frequency dispersion of the signal is the delay of the signal at each frequency and the phase shift. The dispersion distortions compensation device involves the set of FIR filters and the delay line. The set of FIR filters eliminate fractional delay are implemented in the compensation scheme by means of the signal re-digitization with the help of the 19-th degree interpolation polynomial. Each of the FIR filters is multiplied by a coefficient that eliminates the certain phase shift. The delay line eliminates the integer part of the delay. Also, this article estimates the required number of channels in a dispersion compensation device based on a bank of digital filters and compares compensation algorithms on the basis of a filter bank and a filter-compensator. Analytical expressions are obtained for the approximate calculation of the maximum and standard deviations of the phase response of the system, reflecting the dependence of the phase response on the number of frequency subchannels, the order of the interpolation polynomial of the interpolator, the length of the polyphase components of the prototype filter, the slope of the dispersion characteristic, and the passband of the filter bank. Besides, a theoretical and experimental study is concluded, the purpose of which is to confirm the performance and efficiency (availability in terms of the signal-to-noise ratio) of the algorithms for compensating for dispersion distortion of broadband signals in the decameter band, embedded in a digital analysissynthesis filter bank.

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Section: Introductionmentioning

confidence: 99%

“…Figure5shows a comparison of the theoretical (calculated by formulas(7,8) and experimental dependences of rms and min max on the number of filters 2M for four different values of the slope s and for the sampling frequency…”

mentioning

confidence: 99%

Wideband HF signals dispersion distortion compensator based on digital filter banks. Theory and approbation

Chirov¹

2020

T-Comm

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Determining Channels Number in the Digital Filter Bank for the Wideband Signals Dispersion Distortion Compensation

Lobova

2020

2020 Systems of Signals Generating and Processing in the Field of on Board Communications

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Wideband Signals Dispersion Distortions Optimum Tracking Compensator Based On Digital Filter Banks Using Farrow Filters

Lipatkin

Lobova

Kandaurov

2020

2020 Systems of Signals Generating and Processing in the Field of on Board Communications

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Optimum estimation and filtering of the ionospheric channel dispersion characteristics slope algorithms

Cited by 11 publications

References 1 publication

Wideband HF signals dispersion distortion compensator based on digital filter banks. Theory and approbation

Wideband HF signals dispersion distortion compensator based on digital filter banks. Theory and approbation

Determining Channels Number in the Digital Filter Bank for the Wideband Signals Dispersion Distortion Compensation

Wideband Signals Dispersion Distortions Optimum Tracking Compensator Based On Digital Filter Banks Using Farrow Filters

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