Joint mitigation of time- and frequency-selective fading is an important and challenging problem in mobile communications. Relying on transmitter-induced redundancy, we propose novel channel estimation and symbol recovery approaches for blind identification and equalization of time- and frequency-selective channels, where the time variation is modeled deterministically by a basis expansion. The resulting statistical algorithm enables the usage of a single antenna, dispenses with channel disparity conditions of existing approaches, and allows channel order overestimation. In addition, new deterministic algorithms for generalized OFDM systems are introduced that produce reliable estimates with few data points at high SNR's Simulations illustrate the approaches developed.
Bibliographical noteFunding Information:
Manuscript received February 26, 1999; revised February 17, 2000. This work was supported by the National Science Foundation under Grant MIP 9424305 and by ARO Grant DAAG55-98-1-0336. Part of the results in this paper appeared in the Proceedings of the 32nd Asilomar Conference on Signals, Systems and Computers, November 1998 and the Proceedings of the IEEE-SP Workshop on Signal Processing Advances in Wireless Communications, May 1999. The associate editor coordinating the review of this paper and approving it for publication was Prof. A. M. Zoubir.