A study of opportunism for multiple-antenna systems

Recently proposed opportunistic beamforming exploits the multiuser diversity to reduce the feedback by not requiring the precoding information used for closed-loop schemes to be known at the transmitter. Opportunism could also be beneficially employed for other multiple-antenna transmission techniqu...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on information theory 2005-05, Vol.51 (5), p.1804-1814
Main Authors: Sharma, N., Ozarow, L.H.
Format: Article
Language:English
Subjects:
Antennas
Applied sciences
Approximation
Array signal processing
Asymptotic properties
Bandwidth
Beamforming
Closed loop systems
Closed-form solution
Communication channels
Detection, estimation, filtering, equalization, prediction
Exact sciences and technology
Exact solutions
Feedback
Gain
Information, signal and communications theory
Mathematical analysis
MIMO
Multiple antennas
multiuser diversity
opportunistic beamforming
Receiving antennas
scheduling
Signal and communications theory
Signal to noise ratio
Signal, noise
Streams
Telecommunications and information theory
Throughput
Transmitters
Transmitting antennas
wireless system design
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Recently proposed opportunistic beamforming exploits the multiuser diversity to reduce the feedback by not requiring the precoding information used for closed-loop schemes to be known at the transmitter. Opportunism could also be beneficially employed for other multiple-antenna transmission techniques like cophasing and antenna selection. For opportunistic beamforming and antenna selection, we give closed-form expressions for throughput that closely approximate the performance of these schemes with a Proportionally Fair scheduler (PFS) at low signal-to-noise ratios (SNRs). For large number of transmit antennas, opportunistic cophasing has similar performance as opportunistic beamforming. Asymptotic dependence of the required number of users to achieve the gains of opportunism on the number of transmit antennas is exponential for opportunistic beamforming (and cophasing for large numbers of transmit antennas), and at best linear for opportunistic antenna selection. For multiple-antenna receivers, we additionally examine an opportunistic multiple-input multiple-output (MIMO) scheme that transmits multiple data streams simultaneously to the same user.
ISSN:0018-9448
1557-9654
DOI:10.1109/TIT.2005.846410