DocumentCode :
3417738
Title :
Exploiting long-term statistics in spatially correlated multi-user MIMO systems with quantized channel norm feedback
Author :
Björnson, Emil ; Ottersten, Björn
Author_Institution :
KTH Signal Process. Lab., R. Inst. of Technol., Stockholm
fYear :
2008
fDate :
March 31 2008-April 4 2008
Firstpage :
3117
Lastpage :
3120
Abstract :
In wireless multiple antenna and multi-user systems, the spatial dimensions may be exploited to increase the performance by means of antenna gain, spatial diversity, and multi-user diversity. A limiting factor in such systems is the channel information required by the transmitter to control the intra-cell interference. Herein, the properties of spatially correlated channels with long-term statistical information at the transmitter and fixed-rate feedback of the quantized Euclidean channel norm are analyzed using a spectral subspace decomposition framework. A spatial division multiple access scheme is proposed with interference suppression at the receiver and joint scheduling and zero-forcing beamforming at the transmitter. Closed-form expressions for first and second order moments of the feedback conditional channel statistics are derived. It is shown that only a few bits of feedback are required to achieve reliable rate estimation and weighted sum-rate maximization.
Keywords :
MIMO communication; feedback; multi-access systems; optimisation; statistical analysis; wireless channels; antenna gain; feedback conditional channel statistics; first order moments; fixed-rate feedback; interference suppression; intra-cell interference control; joint scheduling; long-term statistics; multiuser MIMO systems; multiuser diversity; quantized Euclidean channel norm; quantized channel norm feedback; rate estimation; second order moments; spatial dimensions; spatial diversity; spatial division multiple access scheme; spectral subspace decomposition framework; weighted sum-rate maximization; wireless multiple antenna; zero-forcing beamforming; Array signal processing; Control systems; Feedback; Information analysis; Interference suppression; MIMO; Performance gain; Spectral analysis; Statistics; Transmitters; Array signal processing; Feedback; MIMO systems; Mobile communication; Spatial division multiple access;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech and Signal Processing, 2008. ICASSP 2008. IEEE International Conference on
Conference_Location :
Las Vegas, NV
ISSN :
1520-6149
Print_ISBN :
978-1-4244-1483-3
Electronic_ISBN :
1520-6149
Type :
conf
DOI :
10.1109/ICASSP.2008.4518310
Filename :
4518310
Link To Document :
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