Inter-Frame, Fine Frequency/Phase Synchronization forSimple Space-Time-Coded OFDM Receivers

This paper proposes an enhanced receiver (Rx) configuration for multiple-input, multiple-output (MIMO) OFDM systems, operating under the composite effect of phase noise (PHN), residual frequency offset (RFO) and the transmission channel, herein modeled as quasi-static but unknown. The proposed Rx identifies the different impairments by exploiting their different time constants and compensates for each one accordingly. It includes a novel inter-frame fine frequency synchronization (FFS) scheme, which is closely coupled to an intra-frame adaptive phase synchronizer/channel estimator. The proposed scheme is evaluated for a 2 times 2, Alamouti space-time code (STC), and is shown to provide significant performance gain. The theory can be employed with any other STC scheme.

[1]  Geoffrey Ye Li,et al.  Simplified channel estimation for OFDM systems with multiple transmit antennas , 2002, IEEE Trans. Wirel. Commun..

[2]  Siavash M. Alamouti,et al.  A simple transmit diversity technique for wireless communications , 1998, IEEE J. Sel. Areas Commun..

[3]  Andreas Polydoros,et al.  Phase-impairment effects and compensation algorithms for OFDM systems , 2005, IEEE Transactions on Communications.

[4]  Andreas Polydoros,et al.  Decision-directed compensation of phase noise and residual frequency offset in a space-Time OFDM receiver , 2004, IEEE Communications Letters.

[5]  Ye Li.  Pilot-symbol-aided channel estimation for OFDM in wireless systems , 1999, 1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363).

[6]  Vinko Erceg,et al.  Channel Models for Fixed Wireless Applications , 2001 .

[7]  Stuart C. Schwartz,et al.  Joint frequency offset and channel estimation for OFDM , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[8]  Yeheskel Bar-Ness,et al.  A phase noise suppression algorithm for OFDM-based WLANs , 2002, IEEE Communications Letters.

[9]  Gordon L. Stüber,et al.  Synchronization for MIMO OFDM systems , 2001, GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270).

[10]  Umberto Mengali,et al.  Synchronization Techniques for Digital Receivers , 1997, Applications of Communications Theory.

[11]  Lawrence Joel Greenstein,et al.  Channel Models for Fixed Wireless Applications Date Submitted , 2001 .

[12]  Yong Soo Cho,et al.  An efficient channel estimation technique for OFDM systems with transmitter diversity , 2000, 11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525).

[13]  Ravi Narasimhan.  Performance of diversity schemes for OFDM systems with frequency offset, phase noise, and channel estimation errors , 2002, IEEE Trans. Commun..

[14]  Visa Koivunen,et al.  Recursive estimation of time-varying channel and frequency offset in MIMO OFDM systems , 2003, 14th IEEE Proceedings on Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003..