The implementation of advanced communication technologies such as nonorthogonal multiple access (NOMA) and cognitive radio (CR) technology in the Internet Things (IoT) networks facilitates wide bandwidth, massive access, low latency. However, development deployment IoT systems are hampered by network security issues. Physical layer (PLS) is an emerging technique to complement significantly impr...

Dear Editor, This letter is concerning friendly jamming unmanned aerial vehicles (UAVs) to assist in the safe communication of UAV base stations. Due openness wireless communication, it vulnerable attacks leading information disclosure or blockage. To address this issue, UAVs can stations and improve security communications. introduces a dual system that consists source (S-UAV) (J-UAV). We cons...

This paper investigates the physical layer security of inband underlay Device-to-Device (D2D) communication, where direct link between D2D users is not available. In this respect, optimal relay and suboptimal selections are utilized to secure transmission. The eavesdropper uses either maximal-ratio combining or selection increase wiretapped signals. secrecy performance analysis performed regard...

The inherent openness of wireless medium makes information security one of the most important and difficult problems in wireless networks. Physical layer security, which achieves the information-theoretic security by exploiting the differences between the physical properties of signal channels such that a degraded signal at an eavesdropper is always ensured and thus the original data can be har...

Cryptography and coding techniques are combined to implement most of the secure communication system. In order to use coding technique, secure communication linked by the physical layer is designed with efficient coding, which provides less security gaps. In order to design such an efficient security in the physical layer, partial unit memory code (PUM) code, is investigated with few popular co...

Physical layer security is an attractive security mechanism, which exploits the randomness characteristics of wireless transmission channel to achieve security. However, it is hampered by the limitation of the channel condition that the main channel must be better than the eavesdropper channel. To alleviate the limitation, cooperative communication is introduced. Few studies have investigated t...

Physical layer security has been considered as an important security approach in wireless communications to protect legitimate transmission from passive eavesdroppers. This paper investigates the physical layer security of a wireless multipleinput multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) communication system in the presence of a multiple-antenna eavesdropper. We ...

Security and privacy have become increasingly significant concerns in wireless communication networks, due to the open nature of the wireless medium which makes the wireless transmission vulnerable to eavesdropping and inimical attacking. The emergence and development of decentralized and ad-hoc wireless networks pose great challenges to the implementation of higher-layer key distribution and m...

Motivated by recent developments in wireless communication, this thesis aims to characterize the secrecy performance in several types of typical wireless networks. Advanced techniques are designed and evaluated to enhance physical layer security in these networks with realistic assumptions, such as signal propagation loss, random node distribution and non-instantaneous channel state information...