Title :
On optimum transmission power strategy in MIMO systems with covariance feedback
Author :
Li, Yipeng ; Ye, Zhongfu
Author_Institution :
Inst. of Statistical Signal Process., Univ. of Sci. & Technol. of China, Hefei, China
fDate :
5/1/2005 12:00:00 AM
Abstract :
We study the optimum transmission power strategy in a multiple-input multiple-output (MIMO) system with perfect channel state information (CSI) at the receiver and channel covariance matrix at the transmitter. A necessary and sufficient condition is derived for the optimum power allocation at the transmitter to maximize the average mutual information. Furthermore, we apply this result to extend the discussion on optimality of beamforming to general cases of transmitting in m directions for achieving capacity.
Keywords :
MIMO systems; antenna arrays; channel allocation; channel capacity; covariance matrices; fading channels; radio links; receiving antennas; transmitting antennas; CSI; MIMO system; channel covariance matrix; fading channels; multiple-input multiple-output system; mutual information; optimum transmission power strategy; perfect channel state information; power allocation; receive antenna; transmit antenna; Channel state information; Covariance matrix; Eigenvalues and eigenfunctions; Feedback; MIMO; Mutual information; Receiving antennas; Sufficient conditions; Transmitters; Transmitting antennas;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2005.1431166
