Security in Correlated Cognitive Radio Channels with Interference

T. Kumar, M. Z. I. Sarkar, D. K. Sarker

Abstract

Cognitive radio network is capable of adopting the best wireless channels by dynamic spectrum management avoiding user interference and congestion. In this paper, secure wireless communication scenario is considered through a multiple-input multiple-output (MIMO) cognitive interference radio network over Rayleigh fading channel. It consists of a primary user A, a secondary user C, a primary receiver B, a secondary receiver D and an eavesdropper E. When A communicates with B, it interferes D, and E tries to decode information from A. In a similar manner, when C communicates with D, it interferes B, and E tries to decode information from C. It is assumed that the terminals of users, receivers and eavesdropper all are equipped with correlated multiple antennas. On the basis of these considerations, we derive the closed-form analytical expression of the ergodic secrecy capacity at the receivers with antenna correlations of all terminals. The effects of transmitting and receiving antennas, their correlations and diversities on the ergodic secrecy capacity are investigated in the presence of eavesdropper. In addition, the effect of antenna correlation with interference case is compared with the case of without interference. Moreover, the effects of eavesdropper antennas and their correlations on the ergodic secrecy capacity are also investigated.

Conclusion

The Key contribution of this paper is to derive the closed-form analytical expression for the ergodic secrecy capacity at the receivers of a MIMO cognitive interference radio network considering antenna correlations at the terminals of cognitive radio networks. Based on our observations and from the numerical results, it can be concluded that although, ergodic secrecy capacity of a MIMO channels can be appreciably enhanced by increasing the number of transmitting/receiving antennas, but spatial correlation effect of antennas significantly reduces the ergodic secrecy capacity of a MIMO cognitive interference radio network. As the effect correlation is reduced in the presence of interference, so a MIMO network system (which suffers from correlation effect) will be suitable for interference channel scenarios. Moreover, a tradeoff between the number of transmitting/receiving antennas and correlation is necessary for achieving better performance from a MIMO cognitive interference radio network.

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