Paper Info
Title
Cognitive Beamforming And Power Control In Time-Varying Channels: Design And Analysis
Abstract
Cognitive beamforming exploiting spatial opportunity is an attractive technique for secondary users to coexist with primary users in cognitive radio environments. If perfect channel state information of the interfering link is available, interference from a secondary transmitter to a primary receiver can be perfectly pre-nulled by choosing the ideal transmit beam. In practice, however, there is channel estimation error due to noise and the time-varying channels. To minimize the residual interference due to those channel estimation errors, channel prediction based on auto regressive (AR) model is introduced in this paper. Further, to cope with extremely rapidly-varying channels, a cognitive transmit power control technique is proposed as well. By combining channel prediction and transmit power control in cognitive beamforming, the cognitive users can share the spectrum with the primary users with a limited interference level in time-varying channels.
Year
DOI
Venue
2013
10.1587/transcom.E96.B.1616
IEICE TRANSACTIONS ON COMMUNICATIONS
Keywords
Field
DocType
cognitive radio, cognitive beamforming, time-varying channels, power control, interference management
Beamforming,Computer science,Power control,Computer network,Communication channel,Electronic engineering,Interference management,Cognition,Cognitive radio
Journal
Volume
Issue
ISSN
E96B
6
0916-8516
Citations 
PageRank 
References 
0
0.34
12
Authors
2
Name
Order
Citations
PageRank
Heejung Yu115422.19
Eui-Rim Jeong217617.40