DocumentCode :
1891326
Title :
On the asymptotic optimality of beam-forming in multi-antenna Gaussian multiple access channels
Author :
Rhee, Wonjong ; Cioffi, John M.
Author_Institution :
STAR Lab., Stanford Univ., CA, USA
Volume :
2
fYear :
2001
fDate :
2001
Firstpage :
891
Abstract :
In this paper, transmit schemes for multi-antenna Gaussian multiple access channels are considered. For the case of a large number of users, a short term power constraint, and slowly fading channels, asymptotic optimality of beamforming is shown under the sum rate maximization criterion. This is an interesting result because the optimal transmit scheme for each user is to beamform to one direction even if each user is equipped with a large number of transmit antennas. Also, this result extends to ISI channels assuming OFDM modulation. A suboptimal transmit scheme based on this result follows for a system with partial channel side information
Keywords :
Gaussian channels; OFDM modulation; antenna arrays; array signal processing; fading channels; intersymbol interference; multi-access systems; multiuser channels; optimisation; ISI channels; OFDM; asymptotic optimality; beamforming; multi-antenna Gaussian multiple access channels; optimal transmit scheme; partial channel side information; short term power constrain; slowly fading channels; suboptimal transmit scheme; sum rate maximization criterion; transmit antennas; Covariance matrix; Delay; Frequency-selective fading channels; Gaussian distribution; Laboratories; OFDM modulation; Receiving antennas; Transmitters; Transmitting antennas;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-7206-9
Type :
conf
DOI :
10.1109/GLOCOM.2001.965547
Filename :
965547
Link To Document :
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