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Secure Beamforming for MIMO-NOMA Based Cognitive Radio Network

Authors: Nibedita Nandan, Sudhan Majhi, Hsiao-Chun Wu

Abstract: Cognitive radio network (CRN) and non-orthogonal multiple-access (NOMA) play the crucial roles in the 5G (fifth generation) wireless communication systems. However, the physicallayer security still remains quite challenging. In this letter, a downlink cascaded transmitting zero-forcing-beamforming (ZFBF) technique is proposed to secure communications in a two-cell multiple-input multiple-output (MIMO), NOMA based CRN. The proposed technique protects the information from illegitimate users (eavesdroppers) within the same and adjacent cells. The restriction on the number of at the transmitter can also be relaxed by applying the signal alignment for the ZFBF technique. This proposed new method can maximize the total secrecy rate of the MIMO-NOMA based CRNs in the lack of conventional transceiver beamforming techniques. Numerical and simulation evaluations have demonstrated the effectiveness of the proposed method.

Published in: IEEE Communication Letters, 2018