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Wireless ad hoc networks are collections of wireless nodes (usually battery powered) that communicate with each other using radio frequency without a fixed infrastructure or centralized control. They are reorganized to have great potentials in a broad range of applications in disaster relief, conference, and battlefield environments, for example. One instance of such networks is wireless sensor networks. These networks as a whole improve the accuracy of information or computation provided by individual computationally weak sensors, and greatly extend the authors' ability to monitor and control the physical world. In wireless ad hoc networks, a message sent by a node is received by all nodes located within the node's transmission range.
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