Mutated Beamforming for Cognitive Radio 5G Relay Network

Abstract

In fifth-generation (5G) relay networks, the network blockage situation upsurges owing to inadequate penetration capability of the radio waves or interruption due to tall buildings and obstacles. To improve the network coverage and spectrum efficiency, a cooperative cognitive relay network with mutated beamforming is proposed. This work introduces mutation and replacement-strategy-based beamforming to enhance the opportunistic throughput and spectral efficiency. The proposed model employs imperfect channel state information (CSI) with consideration of the CSI error due to interfering signal. The mutated beamforming technique is implemented for the cognitive radio environment postefficient spectrum sensing. The proposed mutated beamforming mitigates CSI error via performing beamforming with minimized sidelobes and placing nulls in the desired direction. The mutated beamforming in 5G relay network achieves a spectral efficiency of 30 b/s/Hz at SNR = 20 dB.