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For supporting location-aware computing in indoor environments, the location sensing/positioning system not only need to provide objects' precise location, but also should own such characteristics as: isotropy and convenience for portability. In this paper, we present an indoor location sensing system, Cicada. This System is based on the TDOA (time(More)
In this paper, we follow the recent work of Helleseth, Kholosha, Johanssen and Ness to study the cross correlation between an m-sequence of period 2 m − 1 and the d-decimation of an m-sequence of shorter period 2 n − 1 for an even number m = 2n. Assuming that d satisfies d(2 l + 1) = 2 i (mod 2 n − 1) for some l and i, we prove the cross correlation takes(More)
This paper presents a novel multimodal system to track the participants and identify the active speaker in the smart meeting room. Indoor localization system, Cicada, is used to obtain the location and identity information of the participants. Cicada, developed by our research group, can provide much higher localization precision than most visual tracking(More)
The wireless sensor network based localization system—Cicada is designed to support the location-awareness in indoor environment. The system is based on TDOA (time difference of arrival) between radio frequency and ultrasonic to measure the distances, uses the SWF(slide window filter) and least square fitting for the rough distance correction, adopts the(More)
In this paper, the Ness-Helleseth functions over Fpn defined by the form f (x) = ux p n −1 2 −1 + x p n −2 are proven to be a new class of almost perfect nonlinear (APN) functions and they are CCZ-inequivalent with all other known APN functions when p ≥ 7. The original method of Ness and Helleseth showing the functions are APN for p = 3 and odd n ≥ 3 is(More)