DocumentCode :
2505893
Title :
Transmitter Optimization and Optimality of Beamforming for MIMO Systems in the Presence of Double Scattering
Author :
Li, Xiao ; Jin, Shi ; Gao, Xiqi ; McKay, Matthew R.
Author_Institution :
Southeast Univ. Nanjing, Nanjing
fYear :
2007
fDate :
26-30 Nov. 2007
Firstpage :
3639
Lastpage :
3644
Abstract :
In this paper, we consider a general family of MIMO channels known as double scattering channels, which encompass a variety of propagation environments from independent and identically distributed Rayleigh to degenerate Keyhole or pinhole cases by embracing both rank-deficiency and spatial correlation effects. We investigate the optimal transmit strategy of a single-user MIMO systems with channel statistical information feedback in the presence of double scattering. We show that transmitting in the direction of the eigenvectors of the transmit correlation matrix is the optimal transmission strategy under the criteria of maximizing the ergodic capacity. In addition to this, the power allocation problem is studied and a necessary and sufficient condition for optimality of beamforming is derived.
Keywords :
MIMO communication; Rayleigh channels; Rayleigh scattering; correlation methods; eigenvalues and eigenfunctions; matrix algebra; optimisation; radio transmitters; MIMO channel system; channel statistical information feedback; correlation matrix; distributed Rayleigh channel; double scattering channel; ergodic capacity; optimal transmission strategy; pinhole case; power allocation problem; rank-deficiency effect; spatial correlation effect; AWGN; Array signal processing; Fading; Feedback; MIMO; Rayleigh scattering; Receiving antennas; Sufficient conditions; Transmitters; Transmitting antennas;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Global Telecommunications Conference, 2007. GLOBECOM '07. IEEE
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4244-1042-2
Electronic_ISBN :
978-1-4244-1043-9
Type :
conf
DOI :
10.1109/GLOCOM.2007.691
Filename :
4411601
Link To Document :
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