Pilot-symbol-aided channel estimation in time and frequency

The potentials of pilot-symbol-aided channel estimation in two dimensions are explored for mobile radio and broadcasting applications. In order to procure this goal, the discrete shift-variant 2-D Wiener filter is analyzed given an arbitrary sampling grid, an arbitrary (but possibly optimized) selection of observations, and the possibility of model mismatch. Filtering in two dimensions is revealed to outperform filtering in just one dimension with respect to overhead, mean-square error performance and latency. Conceptually, the discrete shiftvariant 2-D Wiener filter is the optimal linear estimator for the given problem, however, two cascaded orthogonal 1-D filters are simpler to implement and virtually as good as true 2-D filters. Analytical results are presented, verified by Monte-Carlo simulations.

[1]  Peter Adam Hoeher,et al.  A statistical discrete-time model for the WSSUS multipath channel , 1992 .

[2]  John H. Lodge,et al.  TCMP-a modulation and coding strategy for Rician fading channels , 1989, IEEE J. Sel. Areas Commun..

[3]  Michael J. Gertsman,et al.  Symbol-by-symbol MAP demodulation of CPM and PSK signals on Rayleigh flat-fading channels , 1997, IEEE Trans. Commun..

[4]  R. Mersereau,et al.  The processing of periodically sampled multidimensional signals , 1983 .

[5]  William K. Pratt,et al.  Generalized Wiener Filtering Computation Techniques , 1972, IEEE Transactions on Computers.

[6]  Magnus Sandell.  Design and analysis of estimators for multicarrier modulation and ultrasonic imaging , 1996 .

[7]  Stefan Kaiser,et al.  Performance of multi-carrier CDMA systems with channel estimation in two dimensions , 1997, Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97.

[8]  Heinrich Meyr,et al.  A systematic approach to carrier recovery and detection of digitally phase modulated signals of fading channels , 1989, IEEE Trans. Commun..

[9]  Peter Adam Hoeher.  TCM on Frequency-Selective Land-Mobile Fading Channels , 1991 .

[10]  THOMAS MUELLER,et al.  Performance of coherent OFDM-CDMA for broadband mobile communications , 1995, Wirel. Pers. Commun..

[11]  C. Helstrom.  Image Restoration by the Method of Least Squares , 1967 .

[12]  Arne Svensson,et al.  A decision directed coherent detector for OFDM , 1996, Proceedings of Vehicular Technology Conference - VTC.

[13]  Stefan A. Fechtel.  Verfahren und Algorithmen der robusten Synchronisation für die Datenübertragung über dispersive Schwundkanäle , 1993 .

[14]  Gerd Ascheid,et al.  A new method for phase synchronization and automatic gain control of linearly modulated signals on frequency-flat fading channels , 1991, IEEE Trans. Commun..

[15]  J. Cavers.  An analysis of pilot symbol assisted modulation for Rayleigh fading channels (mobile radio) , 1991 .

[16]  Fredrik Tufvesson,et al.  Pilot assisted channel estimation for OFDM in mobile cellular systems , 1997, 1997 IEEE 47th Vehicular Technology Conference. Technology in Motion.

[17]  李幼升,et al.  Ph , 1989 .

[18]  P. Bello.  Characterization of Randomly Time-Variant Linear Channels , 1963 .

[19]  M. Ekstrom,et al.  Realizable Wiener filtering in two dimensions , 1982 .

[20]  Patrick Robertson,et al.  Two-dimensional pilot-symbol-aided channel estimation by Wiener filtering , 1997, 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing.