This letter proposes a novel decoding scheme for Alamouti's space-time (ST) coded transmissions over time-selective fading channels that arise due to Doppler shifts and carrier frequency offsets. Modeling the time-selective channels as random processes, we employ Kalman filtering for channel tracking in order to enable ST decoding with diversity gains. Computer simulations confirm that the proposed scheme exhibits robustness to time-selectivity with a few training symbols.
Bibliographical noteFunding Information:
Paper approved by W. E. Ryan, the Editor for Modulation, Coding, and Equalization of the IEEE Communications Society. Manuscript received December 6, 2000; revised July 5, 2001. This work was supported by the ARO under Grant DAAG55-98-1-0336. This work was presented in part at MILCOM Conference, Los Angeles, CA, Oct. 22–25, 2000.
- Diversity methods
- Kalman filtering
- Space-time codes
- Transmit antennas