Physical layer security in cooperative wireless networks

With the expansion of ۵G technology and the increase in sensitive data exchange, information security has become a fundamental challenge. This article presents a solution based on Physical Layer Security (PLS) for multi-antenna wireless networks. In this approach, a multi-antenna wireless communication system is examined in which two users securely exchange information through a relay node in the presence of an eavesdropping node. To prevent eavesdropping on authorized nodes' information, the proposed system utilizes a cooperative interference technique in two separate phases with Transmit Zero-Forcing (TZF) beamforming to reduce the Signal-to-Interference-plus-Noise Ratio (SINR) at the eavesdropping node. Simultaneously, by employing receive beamforming based on the Maximum Ratio Combining (MRC) scheme, this system increases the SINR at authorized nodes. Results show that at a power of ۲.۵۶ dBm, the proposed system with ۱۰ antennas generates an average secrecy rate of ۲.۹۷ bits per second per hertz, and with ۶ antennas, ۱.۱۲ bits per second per hertz, while the reference system under similar conditions only achieves ۰.۳۵ and ۰.۱۵ bits per second per hertz. Additionally, at the same power, the proposed system creates eavesdropping link outage probabilities of ۹۹% and ۹۷% for ۱۰ and ۶ antennas, respectively, whereas the reference system under similar conditions creates eavesdropping link outage probabilities of ۹۳% and ۷۲%. These results demonstrate the significant superiority of the proposed system in improving the physical layer security of telecommunication networks.

کلیدواژه ها:

Two-phase cooperative interference ، multi-antenna nodes ، physical layer security ، conventional cryptography