1  Abstract—In cognitive radio networks (CRN), secondary users (SUs) can share spectrum with licensed primary users (PUs). Because an SU receiver (SU-Rx) does not always share the same view of spectrum availability as the corresponding SU transmitter (SU-Tx), spectrum sensing conducted only by an SU transmitter tends to be overly sensitive to guarantee safe spectrum access at the price of SU i...

This paper is a survey of existing methods of communication in usual networks. We particularly study the complete network, the ring, the torus, the grid, the hypercube, the cube connected cycles, the undirected de Bruijn graph, the star graph, the shuffle-exchange graph, and the butterfly graph. Two different models of communication time are analysed, namely the constant model and the linear mo...

In this paper, passive Intelligent Reflecting Surface (IRS) is used to enhance the performance of a Full Duplex (FD) bidirectional Machine Type Communication (MTC) system with two source nodes. Each node equipped antennas operate in FD mode. reality, self-interference and discrete phase shifting are major impairments IRS-assisted communication, respectively. The at nodes operating mode mitigate...

Infrastructure-less (sometimes known as ad-hoc) networking paradigm is very appealing and potentially shaping its future into almost all emerging networks (i.e., IoT, wireless sensor networks, vehicular ad-hoc emergency, tactical radio etc.). However, when conventional protocols are used, such often perform poorly, mainly because of interference within the network limited throughput. Recent adv...

Intelligent reflecting surfaces (IRSs) have emerged as a promising wireless technology for the dynamic configuration and control of electromagnetic waves, thus creating smart (programmable) radio environment. In this context, we study multi-IRS assisted two-way communication system consisting two users that employ full-duplex (FD) technology. More specifically, deal with joint IRS location size...

In this work, we propose a covert communication scheme where the transmitter attempts to hide its transmission to a full-duplex receiver, from a warden that is to detect this covert transmission using a radiometer. Specifically, we first derive the detection error rate at the warden, based on which the optimal detection threshold for its radiometer is analytically determined and its expected de...

With crowded usage of the wireless spectrum, full-duplex wireless systems are introduced to increase bandwidth efficiency by transmitting and receiving on the same frequency band at the same time. Full-duplex communication is a promising solution for greater wireless communications efficiency but, it requires solving the problem of self-interference. SelfInterference cancellation is the process...

Visible light communication (VLC) has largeunlicensed bandwidth, enables communication in radio frequency (RF) responsive environments, understand energy-efficient data transmission, and has the potential to increase the capacity of wireless access networks . On the other hand, WiFi provides more coverage than VLC. In order to take the advantages of both WiFi and VLC, we studied hybrid WiFi-VLC...