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The authors investigate the problem of channel assignment in a metropolitan wireless multi-radio mesh network with directional antennas. They first present a new conflict graph model for capturing the interference between links in a mesh network with a known wireless interface communication graph. Then they present a channel assignment procedure which accounts for interference both between links internal to the mesh network, and from external sources. Key components of the channel assignment procedure are the interference model, the link ordering, and the channel selection metric. They have implemented and evaluated the proposed channel assignment procedure in an actual metropolitan mesh network with link distances from 1.6 to 5 Km.
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