Using OFDM System in Wireless Transmission for Resistance to ISI

Research Area: Volume 10,Issue 5,Sept., 2021 Year: 2021
Type of Publication: Article Keywords: OFDM, 16QAM, IFFT, DFT, ISI, AWGN Channel
Authors:
  • Kameelah Khalleefah Alnamri
Journal: IJEIR Volume: 10
Number: 5 Pages: 223-234
Month: September
ISSN: 2277-5668
Abstract:
The main objectives of this paper is investigate the effectiveness of OFDM system as a modulation technique, over single carrier systems for wireless radio applications. An OFDM system is modeled using MATLAB to allow various parameters of the system to be varied and tested. The aim of doing the simulations is to measure the performance of OFDM system under different channel conditions, and to allow for different OFDM configurations to be tested. Two main criteria are used to assess the performance of the OFDM system, which are its tolerance to ISI because of multipath delay spread and channel noise. The simulation software will include generation of 16-QAM complex data symbols, implementation of OFDM modulator ,implementation of OFDM demodulator, OFDM signal with the cyclic extension and Symbol Error Rate effected by noise (AWGN) and Doppler frequency. When this technique is used with cyclic extension, the effects of noise channel and Doppler frequency can be reduced significantly. In addition, the symbol error rate gets rapidly worse as the SNR drops below 5dB and the general behavior of the 16-QAM is that SER increases as the Doppler spread increase. The reason is because of the existence of severe ISI caused by Doppler shifts.

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