The application of cognitive science in data networks has significantly affected data network advances. This book examines recent advances in cognitive networks from the perspective of the latest applications and deployments. Presenting the contributions of internationally renowned experts, it supplies complete and balanced treatment of the fundamentals of cognitive radio communications and cognitive networks. It includes case studies that illustrate how cognitive radio systems and network architectures are built and also covers the latest standards and spectrum policy developments to enable the development of compliant cognitive systems.