Cognitive Networks: Applications and Deployments
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A cognitive network makes use of the information gathered from the network in order to sense the environment, plan actions according to the input, and make appropriate decisions using a reasoning engine. The ability of cognitive networks to learn from the past and use that knowledge to improve future decisions makes them a key area of interest for anyone whose work involves wireless networks and communications.
Cognitive Networks: Applications and Deployments examines recent developments in cognitive networks from the perspective of cutting-edge applications and deployments. Presenting the contributions of internationally renowned experts, it supplies complete and balanced treatment of the fundamentals of both cognitive radio communications and cognitive networks—together with implementation details.
The book includes case studies and detailed descriptions of cognitive radio platforms and testbeds that demonstrate how to build real-world cognitive radio systems and network architectures. It begins with an introduction to efficient spectrum management and presents a survey on joint routing and dynamic spectrum access in cognitive radio networks.
Next, it examines radio spectrum sensing and network coding and design. It explores intelligent routing in graded cognitive networks and presents an energy-efficient routing protocol for cognitive radio ad hoc networks. The book concludes by considering dynamic radio spectrum access and examining vehicular cognitive networks and applications.
Presenting the latest standards and spectrum policy developments, the book’s strong practical orientation provides you with the understanding you will need to participate in the development of compliant cognitive systems.
simultaneously, SA should be coordinated in order to prevent multiple users colliding in overlapping portions of the spectrum. Both overlay and underlay SA techniques are enabled in CRNs. 220.127.116.11 Spectrum Access • Overlay SA: An SU accesses the network using spectrum bands that are not used by PUs. • Underlay SA: Sophisticated spread spectrum techniques are exploited to improve the spectrum utilization, with the signal of SUs being regarded as noise by the PUs. 18.104.22.168 Spectrum Sharing This
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changing their behavior accordingly. In dynamic spectrum sharing, SUs are not allowed to cause harmful interference to the incumbent PUs. It is worth noting that the SUs are essentially invisible to the PUs in CWNs; hence, possibly no changes are needed for licensed users/devices. In such a scenario, SUs can either be allowed to transmit at low power as in the ultra wideband (UWB) system or be allowed to use spectrum opportunities dynamically to transmit without causing the harmful interference
order to improve the overall system performance, SUs can choose the channels that have less traffic or less number of users. In this approach, SUs and PUs coexist in the system and use the bands simultaneously. • Vertical sharing, where SUs have less preference over the PUs, and, thus, SUs must vacate the spectrum as fast as possible once the licensed PUs are detected in the band. However, SUs can use the spectrum with potential whenever they detect the r a d i o s p eC t rum sensin g in C w n