Research on optimization schemes about physical layer security of RFID system with multiple antennas

Abstract

In recent years, Radio Frequency Identification(RFID) serves as a critical technology of "Internet of things" and attracts tremendous attention, and how to guarantee its communication security has become a challenge. Based on the physical layer, this paper does some researches on security performance of a passive RFID system equipped with multiple antennas. The paper adopts the technique of Artificial Noise(AN) and puts forward two different safety optimization schemes called "power minimization scheme" and "Signal to Interference and Noise Ratio(SINR) maximization scheme", and two related "null space schemes" are proposed. Then using the mathematical method called semi-definite relaxation and convex optimization to optimize those schemes，simulations proves that security performance of the schemes that adopt AN are better than that without using AN, and achieve the purpose of power saving and SINR maximizing as well. The works really make a great impact on the power limited and cost constrained RFID systems.

Keywords

• multiple antennas
• radio frequency identification
• physical layer security
• artificial noise
• semi-definite relaxation
• convex optimization