Robust timing and frequency synchronization based on constant amplitude zero autocorrelation sequence for OFDM systems

Communication Problem-Solving(2014)

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Abstract
In this paper, we propose a robust timing and frequency synchronization algorithm for the orthogonal frequency division multiplexing (OFDM) systems. The algorithm we proposed can achieve accurate timing and frequency synchronization in time-domain by using the preamble consisting of only one training symbol based on constant amplitude zero autocorrelation (CAZAC) sequence and a new weighting factor. The timing metric used in the algorithm has a peak only at the correct starting point while almost zeros at other points. So the “platform effect” can be avoided and a high timing precision can be obtained. Meanwhile, the proposed method of integer frequency offset estimation is robust to the multipath and noise interference. Computer simulation results show that our proposed scheme achieves superior performance under the multipath fading channel than existing algorithms in terms of timing and frequency synchronization.
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Key words
ofdm modulation,fading channels,frequency estimation,multipath channels,noise,radiofrequency interference,synchronisation,time-domain analysis,cazac sequence,ofdm systems,computer simulation,constant amplitude zero autocorrelation sequence,integer frequency offset estimation,multipath fading channel,noise interference,orthogonal frequency division multiplexing systems,platform effect,robust timing-frequency synchronization algorithm,time-domain,timing precision,training symbol,correlation,ofdm,synchronization
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