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In multiuser wireless networks, opportunistic scheduling can improve the system throughput and thus reduce the total completion time. In this paper, we explore the possibility of reducing the completion time further by incorporating traffic information into opportunistic scheduling. More specifically, we first establish convexity properties for(More)
W avelet transforms have recently emerged as a mathematical tool for multiresolution decomposition of signals. They have potential applications in many areas of signal processing that require variable time–frequency localization. The continuous wavelet transform is presented here, and its frequency resolution is derived analytically and shown to depend(More)
he continuous wavelet transform (CWT) displays the scale-dependent structure of a signal as it varies in time. This scale-dependent structure, in turn, is essentially the instantaneous frequency, so that the CWT provides a view of the frequency versus time behavior of the signal and therefore has great potential as a preliminary tool for investigating(More)
designed, developed, and implemented an infrared hazard warning system for subway stations. The Infrared Integrated Indicating System (IRIIS) serves an equivalent function to strips of truncated domes, currently installed at some stations, which give an underfoot warning to blind and visually impaired travelers that they are approaching a platform edge.(More)
Anew method for direct numerical simulation of electromagnetic or acoustic wave scattering by randomly rough surfaces is presented. The numerical scheme is derived from the well-known method of moments, in which the surface current integral equation is discretized to form a large matrix inverse problem. The simulations use recent advances in the efficient(More)
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