Algorithms of nonlinear noise-immune processing for receiving OFDM-signal constructions. Abstract

Zhurnal Radioelektroniki - Journal of Radio Electronics. ISSN 1684-1719. 2020. No. 3
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Full text in Russian (pdf)
Russian page

DOI 10.30898/1684-1719.2020.3.2

UDC 621.391.01

ALGORITHMS OF NONLINEAR NOISE-IMMUNE PROCESSING FOR RECEIVING OF OFDM-SIGNAL CONSTRUCTIONS

L. E. Nazarov, A. S. Zudilin

Fryazino Branch of Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences, Vvedensky Sq. 1, Fryazino Moscow region, 141120, Russia

The paper is received on February 25, 2020

Abstract. The focus of this paper is directed towards the development and investigation of efficient technique of channel spectrum-concentrated noise mitigation for signal constructions based on OFDM-signals (orthogonal frequency division multiplexing) and error-correcting codes. The frequency-domain nonlinear immune-noise processing algorithms for these signal constrictions are proposed. The analysis of noise-immunity for these signal constructions is implemented for convolutional code with code-rate 1/2 and for spectrum-concentrated noise model signal. The developed decoding algorithm for signal constructions involves Fast Fourier Transformation (FFT) with preceding weight window, nonlinear processing (soft/hard restriction or elimination of spectral components) and interleaving of spectral component values and evaluation of soft output decisions from demodulator for decoding. There are recommendations for most effective processing algorithm (namely, elimination of spectral components) that effective for mitigation of the investigated noise signals in the article. The results of computer simulations of these algorithms show the differences between the resulted error-performances and for the ideal error-performances under assumption of existing only AWGN not more than 2.25…4.5 dB for bit-error 10^-5.

Key words: OFDM, nonlinear processing, noise reduction, Kaiser window.

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For citation:

Nazarov L.E., Zudilin A.S. Algorithms of nonlinear noise-immune processing for receiving OFDM-signal constructions. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2020. No. 3. Available at http://jre.cplire.ru/jre/mar20/2/text.pdf. DOI 10.30898/1684-1719.2020.3.2