Cognitive Beamforming and Power Control in Time-Varying Channels: Design and Analysis

Title
Cognitive Beamforming and Power Control in Time-Varying Channels: Design and Analysis
Author(s)
유희정정의림[정의림]
Keywords
RADIO NETWORKS; WIRELESS COMMUNICATIONS
Issue Date
201306
Publisher
IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
Citation
IEICE TRANSACTIONS ON COMMUNICATIONS, v.E96B, no.6, pp.1616 - 1624
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.
URI
http://hdl.handle.net/YU.REPOSITORY/29845http://dx.doi.org/10.1587/transcom.E96.B.1616
ISSN
0916-8516
Appears in Collections:
공과대학 > 모바일정보통신공학과 > Articles
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