UDC  621.391.01

THE ERROR-PERFORMANCE INVESTIGATION FOR SIGNAL CONSTRUCTIONS BASED ON OFDM-SIGNALS FOR CHANNEL POLYHARMONIC NOISE MODEL

 

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 141190, Russia 

 

The paper is received on March 12, 2018

 

Abstract. The focus of this paper is directed towards the development and investigation of efficient technique for channel polyharmonic noise mitigation for signal constructions based on OFDM-signals (orthogonal frequency division multiplexing) and error-correcting codes. In paper the frequency-domain algorithm for that noise mitigation is proposed. The analysis of noise-immunity for these signal constructions is implemented for convolutional code and for low-density parity-check codes (LDPC) with code-rate 1/2 and for polyharmonic signal influence concentrated on a range. The developed decoding algorithm for signal constructions with polyharmonic noise signals concentrated on a range involves Fast Fourier Transformation (FFT) with preceding weight window, clipping and interleaving of spectral component values and evaluation of soft output decisions from demodulator for decoding. There are recommendations for choice of optimal weight windows that effective for mitigation of the investigated noise signals in the article. The class of optimal weight windows includes Kaiser window with parameter β=6...9.

The analysis of noise-immunity in presence to 50 noise signals concentrated on a range with signal/noise -40…-20 dB and AWGN (additive white Gaussian noise) is implemented for signal construction by means of computer simulations of developed processing algorithms. The results of computer simulations show the differences between the resulted error-performances and for the ideal error-performances under assumption existing only AWGN not more 3.1…9.6 dB for bit-error 10^-5.

Key words: OFDM, noise reduction, polyharmonic noise, Kaiser window.

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For citation:
L. E. Nazarov, A. S. Zudilin. The error-performance investigation for signal constructions based on OFDM-signals for channel polyharmonic noise mode. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2018. No. 3. Available at http://jre.cplire.ru/jre/mar18/4/text.pdf

DOI  10.30898/1684-1719.2018.3.1