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Title: Impact of Impulse Noise on the Symbol Error Rate Performance of OFDM Systems
Authors: Bawa, Ambika
Supervisor: Kohli, Amit Kumar
Issue Date: 30-Jul-2012
Abstract: Impulsive noise and Multipath effects are the main reasons to cause bit error in the power line communication and broadband wireless communication over fading channels. In this thesis report, the symbol error rate (SER) performance of the orthogonal frequency division multiplexing (OFDM) system under the impulsive noise and multipath effects are analyzed theoretically and by simulations in terms of closed form formulas. Through the analysis, it is shown that OFDM can mitigate the adverse effect of the impulsive noise, and only the heavily disturbed impulsive noise will interfere the SER performance of the OFDM systems It is also shown that the adverse effect of multipath is more serious than that of impulsive noise. In this thesis report, the guard interval is used to improve the SER performance of the OFDM system. As the longer guard interval is inefficient in using the signal power, the optimum guard interval that can achieve the best SER performance is studied. Under additive impulsive noise, the fast Fourier transform (FFT) in the OFDM receiver introduces changes in the subcarrier noise statistics. As a result, the complexity of optimal detection becomes exponential in the number of subcarriers. Many previous approaches assume a statistical model of the impulsive noise and use parametric methods in the receiver to mitigate impulsive noise. Parametric methods degrade with increasing model mismatch, and require training and parameter estimation. Therefore, my thesis work concludes the study of noise bucket effect on the performance of OFDM systems. Simulation results are presented to demonstrate the statistical properties of impulse noise on 4G mobile communication systems using OFDM technology working under wireless fading channel. The noise bucket effect may be justified by Gaussian distribution due to DFT operator at the receiver. It may be inferred from the presented results that the effects of impulse noise are quite similar to the additive white Gaussian noise on the SER perforation of OFDM systems in the statistical sense. Keywords: OFDM, Impulse Noise, Noise Bucket effect, Multicarrier Communication, DFT, IDFT.
Appears in Collections:Masters Theses@ECED

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