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This paper considers a scenario in which a virtual map with relative positions for multiple wireless client devices has to be generated without resorting to fixed beacons. The proposal is unique in several elements, among which are the delta triangulation method and the method used to infer relative 2D positions for not only all client devices but also all WiFi Access Points (APs) within the local environment. APs provide what this paper refers to as local wireless context, comparing which across clients provides the deltas used for inference. The proposed concept is tested in a small field experiment while large-scale performance analysis is conducted on synthetic traces. Results show that relative distances among clients are preserved in the proposed layouts with high accuracy.
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