This book has been prepared to present the state of the art on WiMAX Technology. WiMAX (short for Worldwide Interoperability for Microwave Access) is a technology standard for long-range wireless networking. WiMAX equipment exists in two basic forms - base stations, installed by service providers to deploy the technology in a coverage area, and receivers, installed in clients. WiMAX supports several networking usage models. WiMAX refers to interoperable implementations of the IEEE 802.16 family of wireless-networks standards ratified by the WiMAX Forum. (Similarly, Wi-Fi refers to interoperable implementations of the IEEE 802.11 Wireless LAN standards certified by the Wi-Fi Alliance.) WiMAX Forum certification allows vendors to sell fixed or mobile products as WiMAX certified, thus ensuring a level of interoperability with other certified products, as long as they fit the same profile. Primarily due to its much higher cost, WiMAX is not a replacement for Wi-Fi home networking or wireless hotspot technologies. Devices that provide connectivity to a WiMAX network are known as subscriber stations (SS). Portable units include handsets (similar to cellular smartphones); PC peripherals (PC Cards or USB dongles); and embedded devices in laptops, which are now available for Wi-Fi services. In addition, there is much emphasis by operators on consumer electronics devices such as Gaming consoles, MP3 players and similar devices. WiMAX is more similar to Wi-Fi than to other 3G cellular technologies. The book, Advanced Transmission Techniques in WiMAX, covers theoretical and technical information, which provides an in-depth review of the most recent advances in the field, for engineers and researchers, and other readers interested in WiMAX. This book is intended for readers interested in the transmission process under WiMAX.