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Challenges in Ad Hoc Networking: Fourth Annual Mediterranean by K. Al Agha, I. Guerin Lassous, G. Pujolle

By K. Al Agha, I. Guerin Lassous, G. Pujolle

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Additional resources for Challenges in Ad Hoc Networking: Fourth Annual Mediterranean Ad Hoc Networking Workshop, June 21-24, 2005, Ile de Porquerolles, France (IFIP International Federation for Information Processing)

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Carrier-sensing: The low power density and low duty cycle of TH impulse radio however implies that it is difficult to distinguish idle periods from packet transmission periods in an UWB receiver [7] and then a long channel detection delay can not be avoided. As a result, MAC protocols based on carrier-sensing would result in poor performance. Acquisition time: The signal acquisition time of impulse radio receivers is longer than conventional receivers (of the order of ms). The transmission of one data packet between two devices normally requires one or more signal acquisitions.

In each cluster, the CH choice can be made using one of the three following criteria: - The sensor having the maximum power level in the cluster. - The nearest sensor to the gravity center of the cluster or to the BS. LEA2C algorithm: To compare our approach with other methods such as EECS method, we use the same communication and data model; also we run our simulation in two different scenes6. 1) Initialization: Random deployment of the N homogeneous sensors in a given space and with the same energy level.

A. 6. LEAZC communications To simulate our algorithms, we have used SOMs core (SomToolbox) proposed by HUT researchers" (Helsinki University of Technology). The figures below present the results obtained. Fig. a. represents the neurons segmentation of the SOM map. Fig. b. represents the sensors network, and shows the sensors clustering. Figs. b represent respectively the variation of the number of sensors alive according to the number of received messages by the BS in the normal scene (400) and the large scene (1000) motes.

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