Multiple antenna channels with partial channel state information at the transmitter

被引:66
作者
Roh, JC [1 ]
Rao, BD [1 ]
机构
[1] Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA
关键词
channel capacity; channel state information (CSI); multiple-input multiple-output (MIMO) systems; multiple antennas; power allocation; transmit beamforming; wireless communication;
D O I
10.1109/TWC.2003.821144
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
We investigate transmission strategies for flat-fading multiple antenna channels with t transmit and r receive antennas, and with channel state information (CSI) partially known to the transmitter. We start with an assumption that the first n eigenvectors of (HH)-H-dagger, where 0 less than or equal to n less than or equal to min(t, r) and H is the channel matrix in C-r x t, are available at the transmitter as partial spatial information of the channel. A beamforming method is proposed in which a beamforming matrix is determined from the n eigenvectors in some predefined way; as a result, the receiver also knows the beamforming matrix. With this,beamforming scheme, we develop a new multiple antenna system concept that provides a mechanism to reduce the amount of channel feedback information. This paper focuses on deriving the channel capacity of the multiple antenna channels employing the proposed beamforming and feedback methods. An important task for achieving capacity is the solution of interesting optimization problems for the optimal power allocation over the transmit symbols. The results show that the proposed methods lead to systems wherein the amount of feedback information can be significantly reduced with a minor, sacrifice of achievable transmission rate.
引用
收藏
页码:677 / 688
页数:12
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