Uniform illumination rendering using an array of LEDs: a signal processing perspective
IEEE Transactions on Signal Processing
Code division-based sensing of illumination contributions in solid-state lighting systems
IEEE Transactions on Signal Processing
On the SIR of a cellular infrared optical wireless system for an aircraft
IEEE Journal on Selected Areas in Communications - Special issue on optical wireless communications
Transmitter and receiver methods for improving asymmetrically-clipped optical OFDM
IEEE Transactions on Wireless Communications
Optical impulse modulation for indoor diffuse wireless communications
IEEE Transactions on Communications
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A simple analytical model of the wireless infrared communication channel in indoor environments is presented. The infrared signal is modeled as the combination of a diffuse component and a line-of-sight (LOS) or direct component. For the diffuse component alone, the properties of the channel are found using Ulbricht's integrating sphere. When a LOS component is also present, the transfer function depends upon the Rician factor K given by the ratio of the electrical power in the LOS and diffuse signals after the detector. For small K, the transfer function shows notches down to low frequencies, but due to the nature of light never for zero frequency. We confirm that a K-factor ⩾13 dB is required also in infrared wireless links in order to support distortionless data transmission beyond 100 Mbit/s. Increasing the directivity at the receiver and/or at the transmitter improves the effective value of K. Here, we show that a moderate directivity will be sufficient for high-speed infrared communication in typical indoor scenarios