Cognitive radio for nextgeneration wireless networksan approach to opportunistic channel s.pdf

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1、HOSSAINLAYOUT2/4/093:35PMPage46ACCEPTEDFROMOPENCALLCOGNITIVERADIOFORNEXT-GENERATIONWIRELESSNETWORKS:ANAPPROACHTOOPPORTUNISTICCHANNELSELECTIONINIEEE802.11-BASEDWIRELESSMESHDUSITNIYATO,NANYANGTECHNOLOGICALUNIVERSITYEKRAMHOSSAIN,UNIVERSITYOFMANITOBA1ABSTRACTTheconceptofsoftwar

2、edefinedradioandcognitiveradiowasintroducedtoenhancethe“Cognitiveradio”hasemergedasanewdesignefficiencyoffrequencyspectrumusage[1].Soft-paradigmfornext-generationwirelessnetworkswareradioimprovesthecapabilityofawireless5thataimstoincreaseutilizationofthescarcetransceiverbyu

3、singembeddedsoftwaretoradiospectrum(bothlicensedandunlicensed).enabletheradiotransceivertooperateinmulti-Learningandadaptationaretwosignificantfea-plefrequencybands.Thecognitiveratioisaspe-turesofacognitiveradiotransceiver.Intelligentcialtypeofsoftwaredefinedradiowhichisabl

4、ealgorithmsareusedtolearnthesurroundingtointelligentlyadaptitselftothechangingenvi-environment,andtheknowledgethusobtainedronment.Efficientlearningandintelligentdeci-isutilizedbythetransceivertochoosethefre-sionmakingalgorithmsarekeystothequencyband(i.e.,channel)oftransmiss

5、ionasimplementationofcognitiveradiotoachievethewellastransmissionparameterstoachievethedesiredsystemobjectives.bestperformance.InthisarticlewefirstprovideInthisarticlewefirstprovideanoverview204060anoverviewofthedifferentcomponentstoofthemajorcomponents—observation,achievea

6、daptabilityinacognitiveradiolearning,decisionmakingandplanning,andtransceiveranddiscusstherelatedapproaches.actingprocesses—inacognitiveradiosys-TheauthorsprovideAsurveyofthecognitiveradiotechniquesusedtem.Thedifferenttechniquesproposedforinthedifferentwirelesssystemsisthen

7、present-cognitiveradiodesign(e.g.,estimationtech-anoverviewoftheed.Tothisend,adynamicopportunisticchannelnique,gametheory,decisiontheory,andpric-selectionschemebasedonthecognitiveradioing)arealsodiscussed.ThenasurveyofdifferentcomponentsconceptispresentedforanIEEE802.11-bas

8、edrelatedworkintheliteratureonthedifferentwirelessmeshnetwork.typesofwirelesscommu