Introduction

This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book focuses on the channel model for unmanned aerial vehicles (UAVs) networks. It describes the fundamental properties of the ultrawide band channel and presents one of the first experimental off‐body studies between a human subject and an UAV at 7.5 GHz of bandwidth. The book also describes the use of a Q‐learning algorithm, which is based on a cooperative multiagent approach, to intelligently find the optimal position of a set of drones. It presents a self‐energized UAV‐assisted caching relaying scheme. The book focuses on the case study of millimeter‐wave (mmWave) and terahertz communication and technical challenges for applying mmWave and THz frequency band for communication with UAVs. It discusses a method that uses a cooperative UAV as a friendly jammer to enhance the security performance of cognitive radio networks.