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We develop a prototype to demonstrate indoor wireless visible light communications (VLC) in which a panel of red, green, and blue (RGB) light-emitting diodes (LEDs) is used as a transmitter as well as a light source. Digital transmissions of text messages are carried out from the LED panel mounted on top of the room ceiling to the receiver located on the table top 2 m vertically below. Using low-cost...
We consider the subcarrier allocation problem for multicast transmissions in the downlink for an OFDM-based wireless network. In conventional multicast transmissions, the data rate of a multicast group is dictated by the achievable data rate of the worst case user whose channel condition is the poorest. We develop a new technique called subcarrier pair allocation (SPA) to allocate OFDM subcarriers...
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