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Hindawi Publishing CorporationJournal of Computer Networks and CommunicationsVolume 2012, Article ID 643604, 2 pagesdoi:10.1155/2012/643604
Editorial
Trends and Applications for Cognitive Radio
Enrico Del Re,1 Torleiv Maseng,2 and Luca Simone Ronga3
1 Department of Electronics and Telecommunications, University of Florence, Via di Santa Marta 3, 50139 Florence, Italy2 Forsvarets Forskningsinstitutt, P.O. Box 25, 2027 Kjeller, Norway3 Italian National Consortium for Telecommunications (CNIT), Via di Santa Marta 3, 50139 Firenze, Italy
Correspondence should be addressed to Enrico Del Re, [email protected]
Received 27 July 2012; Accepted 27 July 2012
Copyright © 2012 Enrico Del Re et al. This is an open access article distributed under the Creative Commons Attribution License,which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
After a decade of cognitive radio, it is time to checkthe level of maturity and the real gains attained by thistechnology. Born with many expectations, which is thereal status of its deployment? From one side a sensibleslowing down of the standardization process is perceived,probably due to economical reasons rather than technicalissues. On the other side the demand of spectral efficiencyfor boosting performances lowering energy consumptionis rapidly increasing. The feeling is that the latter driverprevails against the former, and this is proven by an increasedscientific and industrial interest on efficient CR solutions.
The special issue describes some of the most relevanttechnological trends and promising applications of the CRidea.
The paper entitled “The SS-SCR scheme for dynamicspectrum access” describes an interesting connection betweena sense-based resource allocation and a cooperation schemefor a multihop, multichannel, and multi PU cognitiveenvironment. The scheme can be implemented in a cloud-computing environment, relevant to a consolidated techno-logical trend for future urban deployments.
The paper entitled “Cognitive code-division channeliza-tion with admission control” combines a resource allocationstrategy with an admission control procedure, revealing allthe inner complexity this process owns. The proposed solu-tion is interesting also for its energy efficiency, proving that asatisfactory compromise between efficiency and performanceis one of the achievements of CR.
The paper entitled “Optimizing cooperative cognitive radionetworks with opportunistic access” deeply explores the adop-tion of cooperation for opportunistic radio access. Severalconfigurations of relays and direct accesses are studied and
compared, giving a complete view of the capability of thecooperative paradigm.
The paper entitled “Optimal pricing of spectrum resourcesin wireless opportunistic access” represents here a wide class ofrelevant studies for CR, that is, the adoption of Game Theoryto model the selfish behavior of secondary nodes only par-tially aware of the complete spectral environment. The paperprovides an in-depth study of the advantages of the taxationof used resources in terms of local and global throughput.
The paper entitled “Hybrid experiential-heuristic cogni-tive radio engine architecture and implementation” imple-ments the resources decision process by integrating the twomain approaches, an heuristic one with a learning-based one.The resulting scheme is studied and experimented on a realHW platform to prove its capabilities in terms of flexibilityand spectral efficiency.
The paper entitled “On spectrum sensing for TV whitespace in china” enters the details of a possible exploitationof TV white spaces. The paper reports an experimental HWimplementation of the spectrum sensing module for theChinese context, revealing the global applicability of TVWSconcept.
The paper entitled “Cognitive scout node for communica-tion in disaster scenarios” presents an interesting applicationof CR in emergency scenarios. The proposal is based on ascout node with two main functions: the establishment ofa detailed radio spectrum map in the theatre of operationsand a cooperative base-station aiding the primary networkduring emergency.
The selected papers show recent theoretical advancestoward CR adoption, but also real experimental setups thatprove the high degree of maturity of this technology for mass
2 Journal of Computer Networks and Communications
deployment. The negative energy balance due to increasedcomplexity in the CR receivers is compensated by theimproved spectral efficiency attained by recent CR schemes.
Enrico Del ReTorleiv Maseng
Luca Simone Ronga
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