FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W4233552021> ?p ?o ?g. }

• W4233552021 abstract "In this thesis, we focus on two important design aspects of cooperative spectrum sensing (CSS) in cognitive radio networks which are the selection criterion of cooperating secondary users and the fusion technique for combining their local sensing decisions. We propose a novel adaptive user-group assignment algorithm that addresses the problem of sensing accuracy-efficiency trade-off in group-based CSS with heterogeneous cooperating secondary users. The performance of the proposed algorithm is bounded by 4.2% of the optimal solution. Through extensive simulations, we demonstrate that the proposed algorithm can effectively improve the performance of CSS in terms of the opportunistic throughput, sensing overhead and the number of sensing rounds needed to discover an available channel. Considering the different detection performance of cooperating secondary users, we propose a novel reliability-based decision fusion scheme in which a weight is assigned to each secondary user's local decision based on its reliability. Since the knowledge of the local probabilities of detection and false alarm for each secondary detector may not be known in practice, we employ a counting process to estimate those probabilities based on past global and local decisions. We then formulate the problem of minimizing the network probability of sensing error and develop a dual search algorithm, based on a non-linear Lagrangian approach, to solve the formulated problem. Our simulation results show that the dual algorithm converges to the optimal value with zero duality gap using few numbers of iterations. We also show that the probability of error is reduced by 18% and 88% compared to the OR and AND fusion rules, respectively, when the number of secondary users is eight. We then address the practical concern of secondary users reporting correlated local decisions to the fusion center. For this scenario, we formulate the problem of minimizing the network probability of sensing error optimization problem and employ the genetic algorithm to jointly find the optimal K*-out-of-M fusion rule and the optimal local threshold for a certain correlation index. Simulation results show that the network probability of sensing error degrades as the degree of correlation between cooperating secondary users increases. We also study the problem of multiband cooperative joint detection in the presence of sensing errors due to time offset. We derive the aggregate opportunistic throughput and aggregate interference to primary users for multiband cooperative joint detection in the presence of time offset. Our numerical results demonstrate the negative impact of the time offset on the aggregate opportunistic throughput of multiband cooperative joint detection." @default.
• W4233552021 created "2022-05-12" @default.
• W4233552021 creator A5048972646 @default.
• W4233552021 date "2021-05-23" @default.
• W4233552021 modified "2023-10-16" @default.
• W4233552021 title "Efficient techniques for cooperative spectrum sensing in cognitive radio networks" @default.
• W4233552021 doi "https://doi.org/10.32920/ryerson.14653566" @default.
• W4233552021 hasPublicationYear "2021" @default.
• W4233552021 type Work @default.
• W4233552021 citedByCount "0" @default.
• W4233552021 crossrefType "posted-content" @default.
• W4233552021 hasAuthorship W4233552021A5048972646 @default.
• W4233552021 hasBestOaLocation W42335520211 @default.
• W4233552021 hasConcept C111919701 @default.
• W4233552021 hasConcept C11413529 @default.
• W4233552021 hasConcept C121332964 @default.
• W4233552021 hasConcept C124952713 @default.
• W4233552021 hasConcept C126255220 @default.
• W4233552021 hasConcept C127162648 @default.
• W4233552021 hasConcept C142362112 @default.
• W4233552021 hasConcept C149946192 @default.
• W4233552021 hasConcept C154945302 @default.
• W4233552021 hasConcept C157764524 @default.
• W4233552021 hasConcept C163258240 @default.
• W4233552021 hasConcept C2776836416 @default.
• W4233552021 hasConcept C2779960059 @default.
• W4233552021 hasConcept C2780980858 @default.
• W4233552021 hasConcept C2781234732 @default.
• W4233552021 hasConcept C31258907 @default.
• W4233552021 hasConcept C33923547 @default.
• W4233552021 hasConcept C41008148 @default.
• W4233552021 hasConcept C43214815 @default.
• W4233552021 hasConcept C555944384 @default.
• W4233552021 hasConcept C62520636 @default.
• W4233552021 hasConcept C76155785 @default.
• W4233552021 hasConcept C94915269 @default.
• W4233552021 hasConceptScore W4233552021C111919701 @default.
• W4233552021 hasConceptScore W4233552021C11413529 @default.
• W4233552021 hasConceptScore W4233552021C121332964 @default.
• W4233552021 hasConceptScore W4233552021C124952713 @default.
• W4233552021 hasConceptScore W4233552021C126255220 @default.
• W4233552021 hasConceptScore W4233552021C127162648 @default.
• W4233552021 hasConceptScore W4233552021C142362112 @default.
• W4233552021 hasConceptScore W4233552021C149946192 @default.
• W4233552021 hasConceptScore W4233552021C154945302 @default.
• W4233552021 hasConceptScore W4233552021C157764524 @default.
• W4233552021 hasConceptScore W4233552021C163258240 @default.
• W4233552021 hasConceptScore W4233552021C2776836416 @default.
• W4233552021 hasConceptScore W4233552021C2779960059 @default.
• W4233552021 hasConceptScore W4233552021C2780980858 @default.
• W4233552021 hasConceptScore W4233552021C2781234732 @default.
• W4233552021 hasConceptScore W4233552021C31258907 @default.
• W4233552021 hasConceptScore W4233552021C33923547 @default.
• W4233552021 hasConceptScore W4233552021C41008148 @default.
• W4233552021 hasConceptScore W4233552021C43214815 @default.
• W4233552021 hasConceptScore W4233552021C555944384 @default.
• W4233552021 hasConceptScore W4233552021C62520636 @default.
• W4233552021 hasConceptScore W4233552021C76155785 @default.
• W4233552021 hasConceptScore W4233552021C94915269 @default.
• W4233552021 hasLocation W42335520211 @default.
• W4233552021 hasLocation W42335520212 @default.
• W4233552021 hasOpenAccess W4233552021 @default.
• W4233552021 hasPrimaryLocation W42335520211 @default.
• W4233552021 hasRelatedWork W1574166711 @default.
• W4233552021 hasRelatedWork W1998425906 @default.
• W4233552021 hasRelatedWork W2062035544 @default.
• W4233552021 hasRelatedWork W2085013543 @default.
• W4233552021 hasRelatedWork W2118973398 @default.
• W4233552021 hasRelatedWork W2140760796 @default.
• W4233552021 hasRelatedWork W2158337294 @default.
• W4233552021 hasRelatedWork W2295591136 @default.
• W4233552021 hasRelatedWork W2379353248 @default.
• W4233552021 hasRelatedWork W2983056351 @default.
• W4233552021 isParatext "false" @default.
• W4233552021 isRetracted "false" @default.
• W4233552021 workType "article" @default.