We consider point-to-point wireless links with multiple antennas in the presence of interference, and exploit channel's spatial correlation and the temporal covariance of the interference to design multiantenna transmitters. We develop a space-time spreading scheme that maximizes average signal-to-interference-and-noise ratio, and an optimally power-loaded space-time beamforming (STBF) scheme which improves error-probability performance. In order to increase transmission rates, we combine orthogonal space-time block coding with STBF, optimize power loading across beams, and develop low-complexity receivers. Optimal training for least-squares error channel estimation, and STBF for minimum mean-square error channel estimation, are also studied. Our analytical and simulated results corroborate that STBF with optimal power loading can considerably reduce error probability and channel-estimation errors.
|Original language||English (US)|
|Number of pages||11|
|Journal||IEEE Transactions on Communications|
|State||Published - Mar 2005|
Bibliographical noteFunding Information:
Paper approved by J. Wang, the Editor for Wireless Spread Spectrum of the IEEE Communications Society. Manuscript received February 13, 2004; revised June 16, 2004. The work of X. Cai and G. B. Giannakis was supported through collaborative participation in the Communications and Networks Consortium sponsored by the U.S. Army Research Laboratory under the Collaborative Technology Alliance Program, Cooperative Agreement DAAD19-01-2-0011. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation thereon. The work of M. D. Zoltowski was supported by the Air Force Office of Scientific Research under Grant F49620-03-1-0149. This paper was presented in part at the Signal Processing Workshop on Advances in Wireless Communications, Lisbon, Portugal, July 2004.
- Covariance feedback
- Interference suppression
- Multiple-input multiple-output (MIMO)
- Space-time coding (STC)