Predistortion in Optical Wireless Transmission Using OFDM
HIS '09 Proceedings of the 2009 Ninth International Conference on Hybrid Intelligent Systems - Volume 02
A study of LED nonlinearity effects on optical wireless transmission using OFDM
WOCN'09 Proceedings of the Sixth international conference on Wireless and Optical Communications Networks
Indoor broadcasting via white LEDs and OFDM
IEEE Transactions on Consumer Electronics
Simulation of multipath impulse response for indoor wireless optical channels
IEEE Journal on Selected Areas in Communications
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A method to reduce signal clipping distortion in indoor optical wireless communication systems based on orthogonal frequency division multiplexing (OFDM) modulation is presented in this paper. Compensating the resulting clipping distortion due to LED operational constrains is achieved through the use of iterative signal clipping (ISC) and multiple light emitting diodes (LED) at the transmitter. ISC technique is based on iterative clipping of the time domain OFDM signal and transmission from a multiple LED transmitter. Transmit LEDs are synchronized, located close to each other, and placed to emit light in the same direction. Hence, the channel path gains from each LED to the receiver photo diode are similar. The received signals from the different LEDs add coherently at the receiver. Reported results demonstrate that the effect of distortion due to clipping is eliminated or significantly reduced based on the considered number of LEDs.