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| The Application of Gardner Algorithm to Sampling Rate Synchronization in OFDM Systems |
| Wang Lei Xu Da-zhuan |
| School of Information Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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Abstract Gardner bit synchronization method in single carrier is applied to OFDM system, to complete sampling rate synchronization. Gardner loop is composed of timing error estimator, loop filter and interpolation. The loop filter is replaced by linear least-square fitting which is achieved by recursion in order to reduce computational complexity. The estimation error of sampling rate can be reduced in cubic law. But there are two problems in practice when using least-square fitting. First, the sampling rate is not constant, which will change slowly by the temperature. Second, the intermediate variables will overflow in recursion. So the intermediate variables are modified periodically to limiting the time span and change the coordinate to solve the two problems.
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Received: 05 February 2010
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Corresponding Authors:
Wang Lei
E-mail: wanglei_1982@nuaa.edu.cn
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2011, Vol. 33 
