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

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概要

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• 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.

• The Institute of Electronics, Information and Communication Engineersの論文

著者

• YU Heejung

  Department of Information and Communications Engineering, Yeungman University

• JEONG Eui-Rim

  Department of Information and Communication, Hanbat University

関連論文

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

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