Vol. 14, no.1, 2022


Modeling of communication channels with multipath propagation of signals by noise-immunity coding procedures in the frameworks of LTE standard

Nurlan N. Tashatov, Manara A. Seksembayeva, Yerzhan N. Seitkulov

Gumilyov Eurasian National University, https://fit.enu.kz/
Nur-Sultan 010000, Republic of Kazakhstan
E-mail: tash.nur@mail.ru, anuarkizi@gmail.com, yerzhan.seitkulov@gmail.com
Gennady V. Ovechkin
Utkin Ryazan State Radio Engineering University, http://www.rsreu.ru/
Ryazan 390005, Russian Federation
E-mail: g_ovechkin@mail.ru

Received December 29, 2021, peer-reviewed January 05, 2021, accepted January12, 2022

Abstract: A scheme of orthogonal frequency division multiplexing technologies with a cyclic prefix was used, using the fast Fourier transform algorithm and amplifiers on the transmitter side and a normalizer on the receiver side. By adjusting the gains of the transmitting and receiving sides, the circuit practically makes it possible to reduce situations when inter-symbol interference (ISI) is affected to situations where it does not exist. The proposed model is modeled using Simulink based on MATLAB. The scheme was investigated for the bit error rate (BER) using the additive white Gaussian noise (AWGN) channel and the multipath Rice fading channel operating under the influence of ISI and different parameters for the channel were investigated, where cases of signal delay similar to the EPA standards (Extended Pedestrian A model) were considered. Data transmission in the system includes a Relay channel and AWGN with different values of signal-to-noise ratio (SNR, dB) and different values of Gain, dbGain amplifier. Result: A graph of data transmission performance in a multipath channel with fading with respect to BER and SNR (BER ≈ 0 with values of SNR –21dB) was obtained. The effect of intersymbol interference on the receiver side is also considered by analyzing eye diagrams. The research data can be used in the design of radio engineering devices for data transmission over a wireless network.

Keywords: wireless communication, standard LTE, turbo codes, intersymbol interference, FFT, relay channel, amplifiers, noise-resistant coding, digital signal processing

PACS: 84.40.Ua

RENSIT, 2022, 14(1):73-78 DOI: 10.17725/rensit.2022.14.073.

Full-text electronic version of this article - web site http://en.rensit.ru/vypuski/article/431/14(1)73-78e.pdf