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The authors present the DECODE technique to determine from a remote receiver whether a set of transmitters are co-moving, i.e., moving together in close proximity. Co-movement information can find use in applications ranging from inventory tracking, to social network sensing, and to optimizing mobile device localization. DECODE detects co-moving transmitters by identifying correlations in communication signal strength due to shadow fading. Unlike localization systems, it can operate using measurements from only a single receiver. It requires no changes in or cooperation from the tracked devices other than sporadic transmission of packets.
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