Throughout the next decade, 802 wireless systems will become an integral part of the fourth generation (4G) mobile communication system, where the convergence of wireless and cellular networks will materialize through support of interworking and seamless roaming in different cellular radio technology and wireless access. This book Provides a comprehensive overview and performance evaluation of IEEE 802.11, 802.15 and 802.16 Includes recognition as a tutorial for the basics of wireless communication Discusses challenges in mesh / multi-hop network convey and provide in-depth solutions for their realization with 802 spectrum Includes Wireless System sharing at different levels and provides solutions for coexistence, cooperation and work of the 802 wireless system, which follows the same or different, but share the same spectrum Includes a detailed overview and introduction on cognitive radio and dynamic spectrum access Accompanying website contains simulation software and provide slides of the figures and tables from the book that is ready for presentation programs This book is an important text for advanced students with basic knowledge about wireless communication, graduate students and engineers working in the field of wireless communications.