An Efficient Joint Timing and Frequency Offset Estimation for OFDM Systems

This paper presents a new joint frame synchronization and frequency offset estimation algorithm for orthogonal frequency division multiplexing (OFDM) systems as a modification to Zhang's method (Zhang et al., 2005). By designing a new training preamble weighted by PN sequence, the timing estimator is improved (at least 3dB with low SNR). By estimating time offset first, the computational load is greatly reduced with no loss in frequency offset estimation accuracy. The performance of the proposed method is evaluated by computer simulations in terms of timing error rate (TER) together with computational complexity.

[1]  Seokho Yoon,et al.  An efficient frequency offset estimator for OFDM systems and its performance characteristics , 2001, IEEE Trans. Veh. Technol..

[2]  Daesik Hong,et al.  A novel timing estimation method for OFDM systems , 2002, Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE.

[3]  Vijay K. Bhargava,et al.  A simple and efficient timing offset estimation for OFDM systems , 2000, VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026).

[4]  A. Czylwik.  Synchronization for systems with antenna diversity , 1999, Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324).

[5]  Yuanan Liu,et al.  Joint Frame Synchronization and Frequency Offset Estimationin OFDM Systems , 2005, IEEE Transactions on Broadcasting.

[6]  Donald C. Cox,et al.  Robust frequency and timing synchronization for OFDM , 1997, IEEE Trans. Commun..

[7]  Hiroshi Harada,et al.  Simulation and Software Radio for Mobile Communications , 2002 .

[8]  Hui Zhang,et al.  Synchronization method based on a new constant envelop preamble for OFDM systems , 2005, IEEE Transactions on Broadcasting.