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The authors consider the problem of localizing multiple co-channel transmitters belonging to a licensed or primary network using signal strength measurements taken by a group of unlicensed or secondary nodes. Traditional localization techniques can be applied to multiple transmitter localization, provided that: the total number of co-channel transmitters in the system is known, and an appropriate set of clustered measurements is available. In this paper, they present two criteria to determine the total number of co-channel transmitters in the primary system.
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