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This work presents a bandpass sampling receiver architecture, which takes the advantages of low IF approach while implementing downconversion and image rejection with-out mixer or frequency varying oscillators. The RF signal is downcoverted to a low-IF by means of a quadrature bandpass sampling. A fixed and reduced sampling frequency is applied. The second quadrature downconversion to baseband is...
In aquatic systems, many species rely primarily on visual cues to choose optimal foraging sites, capture prey and avoid potential threats. Increases in the turbidity of water reduce visibility and impede animals in determining the precise location of both predators and food. How individuals balance foraging decisions with anti‐predator behaviour in turbid environments is not well understood.We tested...
Forecasting currency exchange rates are an important financial problem that is receiving increasing attention, especially because of its intrinsic difficulty and practical applications. During the last few years, a number of nonlinear models have been proposed for obtaining accurate prediction results, in an attempt to ameliorate the performance of the traditional linear approaches. Among them, neural...
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