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It is well known that visible light communication (VLC) systems with the direct current-biased optical orthogonal frequency division multiplexing (DCO-OFDM) scheme suffers from high peak-to-average power ratio (PAPR), which leads to serve distortion and degradation of the output of light emitting diodes. Selected mapping (SLM) technique is an attractive PAPR reduction technique for radio frequency...
With the increasing popularity of light emitting diodes (LEDs), visible light communication (VLC) systems provide an attractive alternative method for wireless communication. To reduce complexity and achieve lower cost, the on-off keying (OOK) modulation has been widely adopted in implementation of VLC systems. Although the conventional minimum-voltage detection circuit can remove the interference...
We proposed a novel backlight system, which consisted of a hybrid light guide plate (LGP) and one diffuser sheet. The hybrid LGP contains a flat plate without any microstructures and one layer of optically patterned film (OPF). Comparing with the conventional edge-lit backlight system, the on-axis luminance could be improved to 6.1 by using the novel backlight system and the half-luminance...
With the number of old housing increasing year by year, the traditional monopolized planning solution have no longer adapted to old housing renewal program in which the object usually are multiple benefits groups. So the planning mechanism of old housing renewal need an urgent transition. In order to meet the requirements of different benefits groups, a multiple intervention mechanism with the features...
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