Abstract
In this paper, a secured dual-hop confidential communication system is considered. In which, a source transmits secret information to the destination in the presence of an interferer and an eavesdropper. And, multiple relays provide cooperative diversity at the destination. The interferer, source and relays are equipped with single antenna whereas the destination and eavesdropper are equipped with multiple antennas. The maximum ratio combining (MRC) technique is used to get the best output SNR at the receiver. At the receiver, the expression of MRC combiner output SNR is derived using optimal weighting vector to protect the information from eavesdropping, so that the eavesdropper can't decipher the source message. Then, we derive the optimum secrecy capacity expression at the destination. The derived expressions and the numerical results show that there is an enhancement of secrecy capacity due to the strategy of optimization of the output SNR by weighting vector at the destination.
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