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Title: Certain investigations on Compensation techniques for impulse Noise intercarrier interference and Nonlinear distortion in ofdm systems
Researcher: Sundaraguru R
Guide(s): Sukanesh R
Keywords: Impulse noise
Information and Communication engineering
Orthogonal frequency division multiplexing
Upload Date: 29-Sep-2014
University: Anna University
Completed Date: 01-12-2011
Abstract: One of the major challenges facing modern communication system newlineis to satisfy the ever increasing demand of high speed reliable newlinecommunications with the constraints of extremely limited frequency newlinespectrum limited power and effective on variety of environments It is well newlineknown that Orthogonal frequency division multiplexing OFDM is an newlineemerging and promising multicarrier modulation technique applied widely in newlineboth wired and wireless communication systems due to its high data rate newlinetransmission capability with high bandwidth efficiency However its newlinesensitivity to impulse noise carrier frequency offset and nonlinear distortion newlinedegrades its performance severely thus representing the major drawback of newlinesuch transmission schemes Hence to improve the performance of OFDM newlinebased communication systems the proposed research work focuses the newlinecorrective techniques for mitigation of impulse noise reduction of intercarrier newlineinterference ICI and compensation of nonlinear distortion newlineGenerally OFDM systems are inherently robust to impulse noise newlineInterference since the impulse noise energy is spread simultaneously among newlinethe transmitted OFDM subcarriers Nevertheless this advantage may turn into newlinedisadvantage when the impulse noise energy exceeds certain threshold newlineConsequently impulse noise impairments pose a significant restraint on newlineOFDM systems and cause bit or burst errors in data transmission Herein a newlinenew adaptive thresholding technique is proposed to recover impulse noise newlinecorrupted OFDM signals In this technique preliminary decisions are made in newline the transmitted data to get optimum threshold values and the noise component newlineof each received input sample is estimated Above threshold estimated value newlineindicates impulse noise present in the input signal and it will be subtracted newlinebefore demodulation otherwise no changes made on the received signal newline
Pagination: xviii, 98p.
Appears in Departments:Faculty of Information and Communication Engineering

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