Blind Joint Frequency Offset and Channel Estimation in OFDM Systems

A blind method for joint estimation of the frequency offset and the channel in an OFDM system is presented in this paper. Estimation is achieved in three successive steps. First, the channel containing the frequency-offset component is estimated by means of subspace techniques. The result is then used in the second step, which is cyclostationarity-based, to obtain the frequency offset. Third, the channel can be achieved by removing the frequency-offset component from the result of the first step. Finally, based on the above three steps, an iterative method is used to get more accurate estimation of the channel and the frequency offset. Mathematical deduction and simulation results are both shown that the proposed method is effective, and is superior to methods introduced in two earlier papers.

[1]  D. Jalihal,et al.  An efficient algorithm for joint carrier frequency offset and channel estimation in IEEE 802.16 OFDM systems , 2004, 1st International Symposium onWireless Communication Systems, 2004..

[2]  Robert W. Heath,et al.  Exploiting input cyclostationarity for blind channel identification in OFDM systems , 1999, IEEE Trans. Signal Process..

[3]  W. Gardner.  Exploitation of spectral redundancy in cyclostationary signals , 1991, IEEE Signal Processing Magazine.

[4]  Daesik Hong,et al.  A blind OFDM synchronization algorithm based on cyclic correlation , 2004, IEEE Signal Process. Lett..

[5]  Helmut Bölcskei,et al.  Blind estimation of symbol timing and carrier frequency offset in wireless OFDM systems , 2001, IEEE Trans. Commun..

[6]  Sumit Roy,et al.  A subspace blind channel estimation method for OFDM systems without cyclic prefix , 2001, IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211).

[7]  Ali N. Akansu,et al.  A subspace method for blind channel identification in OFDM systems , 2000, 2000 IEEE International Conference on Communications. ICC 2000. Global Convergence Through Communications. Conference Record.

[8]  Tjeng Thiang Tjhung,et al.  Joint channel estimation and OFDM synchronization in multipath fading , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).