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In-home networking is becoming a reality. New multimedia applications envisaged for in-home networks require data rates of hundreds of Mbps. In order to provision these applications, wireless networks should provide the user with high speed transmission using short-range Gbps wireless technology. With its unlicensed 5 GHz of spectrum, 60 GHz is envisaged for indoor broadband wireless networks. However,...
Cognitive radio network exploits spectrum hole generated by vacation of primary user on the frequency. However, network design paradigms of primary and secondary can be different except for frequency bandwidth in which they are operating. One of differences is network scale which is stemming from transmission power gap between primary and secondary. Especially, small scale primary user such as microphone...
We develop a performance model for the availability of a MobileTV service in a caching hierarchy network. The probability that bandwidth for the service is available is calculated as a function of channel popularity, the number of available channels, cache sizes, network configuration, and content viewing behavior. The system performance and the key factors that affect the performance are analyzed.
This paper approaches an architecture of a communication network as a system that can be analyzed by means of a mathematical apparatus using probabilistic and statistical models. The scenario is often meet in the real world when the services are deployed from a central location to many individual customer networks through their own hub. Because mathematical models need accurate assumptions, it is...
Router mechanisms designed to achieve fair bandwidth allocations, like fair queuing, have many desirable properties for congestion control in the Internet. However, such mechanisms usually need to maintain state, manage buffers, and/or perform packet scheduling on a per flow basis, and this complexity may prevent them from being cost effectively implemented and widely deployed. In this paper, architecture...
DTN (delay-tolerant network) is a network model which is abstracted from many examples of networks in recent years. In this network model, a long period of network division happens frequently, so in a given time a period of end-to-end path does not exist. As DTNpsilas this unique topology nature, the traditional network architecture and routing mechanism is no longer applicable. If the information...
The adaptive network selection, efficient resource management, call admission control (CAC) strategies in mobile WiMAX must consider the characteristic of multi-rate to reduce the call blocking probability (CBP) and call dropping probability (CDP). In this paper, we propose a hierarchical network selection strategy (HNSS) based on grey relational analysis (GRA) to switch to the proper base station...
In this paper a BISR architecture for embedded memories is presented. The proposed scheme utilises a multiple bank cache-like memory for repairs. Statistical analysis is used for minimisation of the total resources required to achieve a very high fault coverage. Simulation results show that the proposed BISR scheme is characterised by high efficiency and low area overhead, even for high defect densities...
The downsizing of transistor dimensions enabled in the future nanotechnologies will inevitably increase the number of faults in the complex ULSI chips. To maintain the production yield at acceptable level, several levels of protection mechanisms will have to be implemented to tolerate the permanent and transient faults occurring in the physical layers. In this paper, we study fault tolerance at the...
Spectrum sensing in the context of wireless microphone (WM) signals is considered in this paper. The spectrum sensing algorithm developed in this study makes use of the property that the bandwidth of the WM signal is narrow compared with the bandwidth of a digital television (DTV) channel. As a result, the power of the WM signal is highly concentrated in the frequency domain and there are apparent...
The color correlogram has proven its worth as an image descriptor for both comparison and retrieval. The paper presents a case study of developing efficient color correlogram algorithms on the STI Cell Broadband Engine (Cell B. E.), which is a state-of-the-art heterogeneous multicore architecture that consists of a traditional microprocessor (PPE) with eight SIMD co-processing unit (SPE) integrated...
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