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Clustering has been used as a fundamental tool to improve scalability in large wireless ad hoc networks. Techniques based on clustering, such as routing, self-organization, context management, service discovery, etc., ensure QoS in wireless ad hoc networks when the number of devices increases. The crucial issue of clustering is the overhead generated during the cluster formation and maintenance phases...
Group mobility has been modeled for simulators to evaluate protocols in wireless ad hoc networks. These mobility models have to be verified in terms of their instant and long-run behaviors. This paper discusses importance and challenges of the stability evaluation for ad hoc group mobility models; proposes analytical technique for the stability of group mobility model and evaluation of the same via...
Accurate and fast wireless link quality assessment (LQA) for wireless channels would bring huge benefits for mobile multi-hop and multi-rate wireless ad hoc and sensor networks in the form of improved end-to-end performance. In this paper, we propose a novel LQA method based on cross-layer information. The method is implemented in a real test-bed, which is based on IEEE 802.11b/g, and achieved a significant...
With the advent of opening up 60 GHz Radio with 5 GHz of available spectrum, many bandwidth-hungry applications can be supported. The immediate concern, however, is the constraint on the line-of-sight transmission as well as the short transmission range of signals. As a result, in an indoor network, a mobile user might experience frequent breaks or losses of connection when one moves from one cell...
Voice enabled applications over the Internet are rapidly gaining popularity. Reducing the total bandwidth requirement can make a non-trivial difference for the subscribers having low speed connectivity. Voice activity detection algorithms for VoIP applications can save bandwidth by filtering the frames that do not contain speech. In this paper we introduce a novel technique to identify the voice and...
Beyond third-generation mobile communications networks will comprise a multitude of integrated legacy and new wireless networks. Mobile ad hoc networks are such new networks. In this paper, we consider the integration of the universal mobile telecommunications system (UMTS) that is a third-generation legacy mobile network and mobile ad hoc networks that are built using the IEEE 802.11 technology....
In this paper, we introduce a highly efficient flooding protocol for MANETs using only one-hop hello messages. By simulation, we show that the protocol has a performance close to flooding protocols that use two-hop hello messages. Further, the protocol performs very good even when the node mobility increases. The only "cost" this protocol must pay is an increased end-to-end delay. However,...
Radio over fiber (RoF) techniques have been developed to combine the mobility of wireless technologies and the huge bandwidth offered by optical fibers. In this paper, we present the concept of a hybrid radio-fiber system using IEEE 802.11 specifications as a solution for future broadband in-house networks. An analysis on the feasibility of applying RoF techniques to the IEEE 802.11's medium access...
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