Analysis on the effects of artificial noise on physical layer security

Physical layer security has gained attention due to the increased usage of wireless communication systems. Our target is to avoid eavesdroppers to receive and decode the transmitted voice signals between the authorized transmitter and the receiver. One of the most fundamental methods of enhancing security in physical layer is artificial noise. Especially the arrival of multiantenna technologies has enabled and accelerated the studies on this field. However, artificial noise based techniques are still in theory only. As a result, practical implementation is a very crucial need for these techniques in order to deploy them in next generation wireless systems. In this study, artificial noise technique is implemented on universal software radio peripheral (USRP) kits, and performance analysis is performed under varying channel conditions and modulation levels. The measurement results are compared with the simulation results. In conclusion, it is shown that the usage of artificial noise can achieve a security level in practice, by decreasing the signal reception quality of eavesdroppers.