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In the cognitive radio ad hoc networks (CRAHNs), the spectrum availability may change from time to time and hop by hop. Thereby, the performance analysis and optimization for CRAHNs become so intricate that pure divide-and-conquer strategies by layered principles strand. Focusing on the five-layer involved performance analysis of CRAHNs, we set up a cross-layer design framework mathematically and...
Spectrum sensing is one of the most mandatory mechanisms of Cognitive Radio (CR) to find the unused Spectrum. Spectrum sensing has renewed on a very active scrutiny area over recent years. As it is one of the most important tasks performed using cognitive radio and the implementation of the other functions of the cognitive radio is based on the spectrum sensing. So it is mandatory for cognitive radio...
Due to the spectrum-temporary challenges in the cognitive radio networks (CRNs), the pure divide-and-conquer strategies by layered principles strand. In this paper, our study presents a framework for cross-layer modeling design to jointly optimise the power and spectrum allocation, multi-path routing, data traffic, and QoS requirements in overlay CRNs. Because of the complexity of the optimization...
In this paper, we investigate the problem of routing for supporting many-to-many communication and optimizing the Quality of Service (QoS) for the Secondary Users (SUs) in Cognitive Radio Networks (CRN). The goal is to build the routing tree for many-to-many communication that optimizes the delay, rate and the number of transmission links. We model the network using the Multi-Layer Hyper Graph, and...
In this paper, focusing on the all-layer involved performance analysis of cognitive radio network for overlay fashion, we propose a joint QoS-aware flow control, routing selection, channel and power allocation with an energy efficiency heuristic algorithm (EeHA). It is a NP-hard problem involving the interactions and restrictions between and across layers; therefore, we put forward a suboptimal solution...
Cognitive Radio Networks (CRNs) are expected to address and to resolve important technological and operational challenges of future networks, such as Dynamic Spectrum Access (DSA), routing in heterogeneous networks and provision of Quality of Experience (QoE) for different applications. Accordingly, a number of new terminal and network functionalities are required to solve the technical problems and...
IEEE P1900.4 is an emerging standard for optimized radio resource utilization where cognitive radio technologies are used for efficient spectrum utilization. In this paper, we design and implement a cognitive wireless network system based on open documents of IEEE P1900.4, and evaluate its performance using UDP streaming and HTTP download. Our experiments show interesting results that total network...
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