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In a pixelated system, the imaging receiver samples the incoming images in the spatial domain.
In order to solve these problems, we have proposed a novel imaging receiver scheme based on fisheye lens for spatial-multiplexing VLC applications [18], which features ultra-wide FOV, good illumination uniformity, ultra-high imaging quality, and compact size.
b Fisheye-lens-based imaging receiver and the projected image.
We designed an imaging receiver using two aspheric lenses instead of one single hemispherical lens to improve the light-beam separation performance.
The spectral and photometric imaging receiver will operate in the 200 650 μm range, to map large areas of the sky.
SPIRE, the Spectral and Photometric Imaging Receiver, is one of three instruments to fly on the European Space Agency's Herschel Space Observatory.
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A conventional receiver uses multiple photodetectors that are oriented in various directions [4, 5]; an imaging diversity receiver is composed of an optical concentrator that focuses on a segmented photodetector array [2, 6, 7] and a sectored receiver which is a hemisphere, where a set of parallels and meridians defines the photodetector boundaries [8, 9].
Later, Kahn et al. [21] reported the use of imaging diversity receiver to reduce ambient light and path loss.
Djahani and Kahn [13, 22] have used multibeam (quasidiffusive) transmitters and imaging diversity receivers to improve the link performance for both LOS and non-LOS IR links.
When these conditions are met, the receiver imaging lens attempts to concentrate the light from each transmitter pixel onto a small region in the photodetector.
To significantly enhance its BER performance, the proposed system can be used in joint with a high-resolution imaging angle diversity receiver.
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