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We 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 comoving transmitters by identifying correlations in communication signal strength due to shadow fading. Unlike localization systems, it can operate using measurementsdoi:10.1109/mahss.2008.4660051 dblp:conf/mass/ChandrasekaranEGMYC08 fatcat:u7whfj6yg5hrhm37ymgq3md2ma