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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Rui Zhang Feifei Gao Ying-Chang Liang |
| Copyright Year | 2009 |
| Description | Author affiliation: Institute for Infocomm Research, A*STAR, Singapore (Rui Zhang; Feifei Gao; Ying-Chang Liang) |
| Abstract | This paper studies the transmission strategy for a cognitive radio (CR) that operates under spectrum sharing with a primary radio (PR). It is assumed that the CR transmitter is equipped with multi-antennas and thereby transmit beamforming and power control are jointly deployed to balance between the interference avoidance at the PR terminals and the throughput maximization of the CR link. We name such an operation as cognitive beamforming (CB). Unlike the prior study on CB that assumes perfect knowledge on the interference channels over which the CR transmitter interferes with the PR terminals, in this paper we remove this assumption and propose a practical CB scheme by utilizing a new idea of effective interference channel, which can be efficiently learned/estimated at the CR transmitter from the received PR signals. Interestingly, it is shown that the proposed CB scheme based on the effective interference channel achieves a capacity gain for the CR over the conventional scheme based on the exact channel knowledge, when the PR terminals are also equipped with multi-antennas but do not operate in a full spatialmultiplexing mode. Furthermore, due to the finite learning time for the effective interference channel, we show that there exists a general learning-throughput tradeoff associated with the practical CB, for which we determine the optimal learning time to maximize the CR link throughput. |
| Starting Page | 588 |
| Ending Page | 592 |
| File Size | 304385 |
| Page Count | 5 |
| File Format | |
| ISBN | 9781424436958 |
| DOI | 10.1109/SPAWC.2009.5161853 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2009-06-21 |
| Publisher Place | Italy |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Array signal processing Interference channels Chromium Radio transmitters Throughput Symmetric matrices Covariance matrix Cognitive radio Power control Channel capacity |
| Content Type | Text |
| Resource Type | Article |
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