DocumentCode :
3056195
Title :
The optimality of beamforming: a unified view
Author :
Srinivasa, Sudhir ; Jafar, Syed Ali
Author_Institution :
Electr. Eng. & Comput. Sci., California Univ., Irvine, CA
Volume :
6
fYear :
2005
fDate :
2-2 Dec. 2005
Lastpage :
3486
Abstract :
We explore the optimality of transmit beamforming for a vector channel with multiple transmit antennas and a single receive antenna. Perfect channel information is assumed to be available at the receiver while the transmitter only has partial/limited knowledge of the user´s channel vector based on feedback. Without limiting the kind of partial/limited feedback or the type of channel distribution, we derive a general necessary and sufficient condition for the optimality of beamforming in such channels. The condition we obtain is universal - applicable to all partial/limited feedback scenarios in all ergodic fading channel distributions regardless of the number of transmit antennas or transmit power. Considering different types of partial/limited feedback, we show how our conditions can be employed to obtain previous results on the optimality of beamforming. With Monte Carlo simulations, we provide numerical results comparing different partial/limited feedback schemes
Keywords :
Monte Carlo methods; antenna arrays; fading channels; receiving antennas; transmitting antennas; Monte Carlo simulations; channel distribution; channel information; ergodic fading channels; multiple transmit antennas; partial-limited feedback schemes; single receive antenna; transmit beamforming; vector channel; Antenna feeds; Array signal processing; Computer science; Fading; Feedback; Receiving antennas; Sufficient conditions; Throughput; Transmitters; Transmitting antennas;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Global Telecommunications Conference, 2005. GLOBECOM '05. IEEE
Conference_Location :
St. Louis, MO
Print_ISBN :
0-7803-9414-3
Type :
conf
DOI :
10.1109/GLOCOM.2005.1578420
Filename :
1578420
Link To Document :
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