Abstract: In this paper, we consider the problem of downlink beam training for extremely large-scale millimeter wave (mmWave)/Terahertz (THz) systems, where the far-field assumption which treats ...

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Starting around 4,000 years ago, an elaborate fish-trapping system nourished expanding human populations in lowland Central America, a new study finds. The discovery of this massive construction ...

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With the recommencement of laser cleaning activities at the V&A ... When a laser is directed at an object, it emits a highly controlled beam of light at a specific wavelength (or colour). This light ...

Secondly, conventional channel estimation schemes overlook practical effects present in mmWave wideband systems, namely beam squint. To tackle these obstacles, this paper presents a learning-aided ...