Referenced Items are not available for this document.
This work studies a cognitive radio (CR) communication system in which multiple antennas assist the secondary user to achieve transmission diversity, while the constraint of zero interference to the primary user is satisfied. We show that due to the zero interference constraint, the secondary link may occasionally suffer from low signal levels, as if it is in deep fading. Employing space time coding for diversity does not help this situation. We show that a beamformer that is mutually orthogonal in time domain across the antennas is effective in mitigating the low signal effects. Further, N antennas provide an equivalent (N-1) × 1 Rayleigh channel due to the function of this beamformer. The effect of a non-orthogonal beamformer is also analyzed and shown by simulations.
Published in:
Wireless Communications, IEEE Transactions on
(Volume:11
,
Issue:
4
)
Date of Publication: April 2012
- Page(s):
- 1266 - 1270
- ISSN :
- 1536-1276
- INSPEC Accession Number:
- 12656401
- Digital Object Identifier :
- 10.1109/TWC.2012.021412.110705
- Product Type:
- Journals & Magazines
- Date of Publication :
- 16 February 2012
- Date of Current Version :
- 16 April 2012
- Issue Date :
- April 2012
- Sponsored by :
- IEEE Communications Society
About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies
A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2013 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.
