The book highlights recent advancements starting from the lowest layers to the upper layers of wireless communication networks and consists of "real-time" research development on the related issues. The information in this book has been systematically organized in order to make it easily accessible to the readers of all levels. It also preserves the balance between the recent research results and their theoretical support. A huge variety of new techniques in this field are investigated in this book. The authors attempt to present these topics in detail by discussing wireless communication antennas, hardware and channel estimation and capacity. Intelligent and reader-friendly elucidations are provided in this book to serve the readers of all levels, ranging from knowledgeable and practicing communication engineers to beginners or professional researchers.