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 intersymbol 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.
