Investigation on secure beamforming in mimo noma based cognitive radio network

Abstract

The Cognitive Radio Network (CRN) and Non-Orthogonal Multiple-Access (NOMA) are important schemes in the 5G radio transmission system. Nevertheless, it is a special path for the cognitive users for the security of transmission among the cells from the interferences in the MIMO-NOMA based CRN framework. In the research work, a novel power allocation based second-order perturbation beamforming method is suggested for the secure exchange between the cells from all other interfered users. There are four distinct techniques suggested in the research work, along with the novel power allocation based second-order perturbation beamforming technique to validate the security in the system model as follows: Maximum Ratio Transmission (MRT) scheme, Equal Power Splitting (EPS) along with the MRT technique, linear Minimum Mean Square Error (MMSE) scheme and low complexity iterative linear MMSE (i-MMSE) technique. newlineThe interference is caused by the imperfect spectrum sensing of the SUs. The SUs are intended to access the primary users (PUs) channel. In the same time, the PU also comes back to the channel before the SUs access ends. Thus, the similar way of accessing the PU channel will cause interference among the users. Thus, the impact of interferences will be greatly reduced by the distinct techniques and the novel power allocation based second-order perturbation scheme. Among them, the novel power allocation based second- newline