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Orthogonal Transmissions for Spectrum Underlay MISO Cognitive Radio

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2 Author(s)
Hongbo Guo ; Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver, Canada V6T 1Z4 ; Victor C. M. Leung

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:

IEEE Transactions on Wireless Communications  (Volume:11 ,  Issue: 4 )