Robust transmit eigen beamforming based on imperfect channel state information

被引:49
作者
Abdel-Samad, A [1 ]
Davidson, TN
Gershman, AB
机构
[1] MIMOS Berhad, IC Design Dept, Kuala Lumpur 57000, Malaysia
[2] McMaster Univ, Dept Elect & Comp Engn, Hamilton, ON L8S 4K1, Canada
[3] Tech Univ Darmstadt, Commun Syst Grp, D-64283 Darmstadt, Germany
基金
加拿大自然科学与工程研究理事会;
关键词
eigen-beamforming; imperfect channel state information; robust transmit beamforming; water-filling;
D O I
10.1109/TSP.2006.872537
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Transmit beamforming is a powerful technique for enhancing the performance and increasing the throughput of wireless communication systems that employ multiple antennas at the transmitter. A major drawback of most existing transmit beamforming techniques is that they require nearly perfect knowledge of the channel at the transmitter, which is typically not available in practice. Transmitter designs that address the imperfect channel state information (CSI) problem commonly use statistical models for the channel and/or mismatch between the presumed and actual transmitter CSI. Since these approaches are model based, they can suffer from mismodeling. In this paper, a more robust framework is proposed in which no statistical assumptions are made about the CSI mismatch or the channel. The goal is to design a transmitter that has the best performance under the worst-case CSI mismatch. The transmitter designed herein achieves this goal for all CSI mismatches below a certain threshold level. The proposed design combines beamforming along the eigenvectors of the (deterministic) autocorrelation of the channel matrix perceived by the transmitter and power loading across those beams. While the power-loading algorithm resembles conventional water-filling to some degree, it explicitly incorporates robustness to the CSI mismatch, and the water level can be determined in a simple systematic way.
引用
收藏
页码:1596 / 1609
页数:14
相关论文
共 25 条
[1]   Robust transmit Eigen-beamforming based on imperfect channel state information [J].
Abdel-Samad, A ;
Gershman, A ;
Davidson, T .
2004 ITG: WORKSHOP ON SMART ANTENNAS, PROCEEDINGS, 2004, :200-207
[2]  
ABDELSAMAD A, 2004, P VEH TECHN C VTC FA, P2049
[3]  
Bertsekas D., 1999, NONLINEAR PROGRAMMIN
[4]  
Boyd S., 2004, CONVEX OPTIMIZATION
[5]   Single-user and multiuser adaptive maximal ratio transmission for Rayleigh channels [J].
Cavers, JK .
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, 2000, 49 (06) :2043-2050
[6]  
Horn R. A., 1986, Matrix analysis
[7]  
Jafar S. A., 2001, Proceedings. 2001 IEEE International Symposium on Information Theory (IEEE Cat. No.01CH37252), DOI 10.1109/ISIT.2001.936184
[8]  
Jafar SA, 2001, 2001 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, VOLS 1-10, CONFERENCE RECORD, P2266, DOI 10.1109/ICC.2001.937059
[9]   Combining beamforming and orthogonal space-time block coding [J].
Jöngren, G ;
Skoglund, M ;
Ottersten, B .
IEEE TRANSACTIONS ON INFORMATION THEORY, 2002, 48 (03) :611-627
[10]   Efficient use of side information in multiple-antenna data transmission over fading channels [J].
Narula, A ;
Lopez, MJ ;
Trott, MD ;
Wornell, GW .
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, 1998, 16 (08) :1423-1436