Joint weighted least squares estimation of frequency and timing offset for OFDM systems over fading channels

This paper presents an algorithm for joint estimation of carrier frequency offset and timing frequency offset in orthogonal frequency division multiplexing (OFDM) systems. A weighted least squares algorithm based on a pilot-aided scheme is proposed. The algorithm operates near the Cramer-Rao bound in the variance of estimation errors. Simulations of several estimation algorithms in a multipath fading channel show that this algorithm provides the most accurate estimation in both the carrier frequency offset and the timing frequency offset.

[1]  Yih-Fang Huang,et al.  Pilot assisted synchronization for wireless OFDM systems over fast time varying fading channels , 1998, VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151).

[2]  Ki-Bum Kim,et al.  A new joint algorithm of symbol timing recovery and sampling clock adjustment for OFDM systems , 1998 .

[3]  V. K. Wei,et al.  On synchronizing and detecting multi-carrier CDMA signals , 1995, Proceedings of ICUPC '95 - 4th IEEE International Conference on Universal Personal Communications.

[4]  Paul H. Moose,et al.  A technique for orthogonal frequency division multiplexing frequency offset correction , 1994, IEEE Trans. Commun..

[5]  Maja Sliskovic,et al.  Carrier and sampling frequency offset estimation and correction in multicarrier systems , 2001, GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270).

[6]  Dong-Seog Han,et al.  Timing phase estimator overcoming Rayleigh fading for OFDM systems , 2001, IEEE Trans. Consumer Electron..

[7]  Alan J. Coulson,et al.  Maximum likelihood synchronization for OFDM using a pilot symbol: algorithms , 2001, IEEE J. Sel. Areas Commun..

[8]  Heinrich Meyr,et al.  Frequency synchronization algorithms for OFDM systems suitable for communication over frequency selective fading channels , 1994, Proceedings of IEEE Vehicular Technology Conference (VTC).