Abstract
The time-varying impulse response of rapidly fading mobile communication channels is expanded over a basis of complex exponentials that arise due to Doppler effects encountered with multipath propagation. Blind methods are reviewed for estimating the bases' parameters and the model orders. Existing second-order methods are critiqued and novel algorithms are developed for blind identification, direct, zero-forcing equalization and minimum mean square error (MMSE) equalization by combining channel diversity with temporal (fractional sampling) and/or spatial diversity which becomes available with multiple receivers. Illustrative simulations are also presented.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1969-1986 |
| Number of pages | 18 |
| Journal | Proceedings of the IEEE |
| Volume | 86 |
| Issue number | 10 |
| DOIs | |
| State | Published - 1998 |
Bibliographical note
Funding Information:Manuscript received August 14, 1997; revised March 6, 1998. This work was supported by NSF Grant MIP 9424305. The authors are with the Department of Electrical Engineering, University of Virginia, Charlottesville, VA 22903-2442 USA (e-mail: [email protected]). Publisher Item Identifier S 0018-9219(98)06973-4.
Keywords
- Adaptive equalizers
- Diversity methods
- Doppler effect
- Fading channels
- Identification
- Least mean square methods
- Mobile communication
- Time-varying channels