Achievable rate of cognitive radio spectrum sharing MIMO channel with space alignment and interference temperature precoding

Abstract
In this paper, we investigate the spectral efficiency gain of an uplink Cognitive Radio (CR) Multi-Input MultiOutput (MIMO) system in which the Secondary/unlicensed User (SU) is allowed to share the spectrum with the Primary/licensed User (PU) using a specific precoding scheme to communicate with a common receiver. The proposed scheme exploits at the same time the free eigenmodes of the primary channel after a space alignment procedure and the interference threshold tolerated by the PU. In our work, we study the maximum achievable rate of the CR node after deriving an optimal power allocation with respect to an outage interference and an average power constraints. We, then, study a protection protocol that considers a fixed interference threshold. Applied to Rayleigh fading channels, we show, through numerical results, that our proposed scheme enhances considerably the cognitive achievable rate. For instance, in case of a perfect detection of the PU signal, after applying Successive Interference Cancellation (SIC), the CR rate remains non-zero for high Signal to Noise Ratio (SNR) which is usually impossible when we only use space alignment technique. In addition, we show that the rate gain is proportional to the allowed interference threshold by providing a fixed rate even in the high SNR range. © 2013 IEEE.

Citation
Sboui, L., Ghazzai, H., Rezki, Z., & Alouini, M.-S. (2013). Achievable rate of cognitive radio spectrum sharing MIMO channel with space alignment and interference temperature precoding. 2013 IEEE International Conference on Communications (ICC). doi:10.1109/icc.2013.6654937

Publisher
Institute of Electrical and Electronics Engineers (IEEE)

Journal
2013 IEEE International Conference on Communications (ICC)

Conference/Event Name
2013 IEEE International Conference on Communications, ICC 2013

DOI
10.1109/ICC.2013.6654937

Permanent link to this record