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Frequency Synchronization in OFDM System

¹ Department of Electronics and Communication Engineering, K.L.N. College of Information Technology, Pottapalayam-630611, Sivagangai District, Tamil Nadu, India
² Dean Academic & Research Committee Chairman, K.L.N. College of Information Technology, Pottapalayam-630611, Sivagangai District, Tamil Nadu, India.

Journal of Signal and Information Processing·Volume 04 (2013)·Pages 138–143·Published 1 August 2013·DOI10.4236/jsip.2013.43B024

Abstract

An accurate frequency synchronization method using the zadoff-chu (ZC) constant envelop preamble is analyzed, and a new preamble weighted by pseudo-noise sequence is used for orthogonal frequency division multiplexing (OFDM) systems. Using this method, frequency offset estimator range is greatly enlarged with no loss in accuracy. The range of the frequency estimation is ±30 of subcarrier spacing using ZC sequence as preamble. Simulations in the MATLAB for an AWGN channel show that the proposed method achieves superior performance to existing techniques in terms of frequency accuracy and range.

KeywordsOrthogonal Frequency Division Multiplexing (OFDM)Additive White Gaussian Noise (AWGN)Carrier Frequency Offset (CFO)Constant Amplitude Zero Auto Correlation (CAZAC)Zadoff-Chu (ZC)

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Frequency Synchronization in OFDM System

Abstract

References (15)