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Call detail records (CDRs) collected at telecommunication networks have been well studied to reveal human behaviors such as voice service usage, contact regularities and mobility patterns. With the advances in big data technology, carriers can now collect, store and analyze more data, such as records of user mobile web activities, at scales much larger than CDRs. In this paper, we study 14 features...
This paper explores the problem of localizing an emitter of radio frequency energy using a network of mobile, uncalibrated receiver nodes. We show that this received signal strength localization problem can be expressed in the form of a nonlinear mixed effects model, by extending the log-distance path loss model to include random biases. Doing so models drop in received signal strength due to distance...
The main challenge of wireless video multicast is to support receivers' heterogeneous characteristics and realize graceful degradation of video quality. The newly emerged Softcast provides smooth video quality for wireless multicast based on raw orthogonal frequency division multiplexing (OFDM) over additive white Gaussian noise (AWGN) channels but its performance suffers when transmitted over practical...
In this paper, we propose a low-cost dual-tone radio interferometric positioning system using a single mobile anchor, named mDRIPS. There is no synchronization requirement between the mobile anchor and the target. In mDRIPS, the static target continuously transmits a dual-tone signal, and the mobile anchor receives the signal at different positions along its trajectory. The instability of the target...
As the usage of wireless devices rapidly increases, mobile phones have become an important aid for people to maintain social relationships. Analysis on cellular networks through mobile communication records, especially when such records contain temporal and spatial information, can potentially unveil fundamental laws that govern the dynamics of social networks. In this paper, we use call detail records...
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