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| A Combined Symbol and Sampling Clock Synchronization Method Applied for Differentially Modulated OFDM Systems without Pilot Carriers |
| Wang Ya-li; Zhang Hai-lin; Wang Yu-min |
| National Key Lab on Integrated Service Network, Xidian University, Xi’an 710071, China |
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Abstract This paper presents a combined symbol and sampling clock synchronization method for OFDM systems. Especially, the timing correction is obtained by interpolation or decimation over sampled signal. This method utilizes the differentially modulated subcarriers in transmitter to obtain the synchronization error signal. The error signal is smoothed by loop filter, then it is used to change the control register of interpolator and decimator: The proposed algorithm can track the frequency shift of sampling clock. The algorithm is simulated in both AWGN and multipath fading channel. Simulation results show that the proposed algorithm is very effective on recovering timing errors of OFDM systems.
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Received: 22 December 2002
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2004, Vol. 26 
