Title :
Linear analog current modulation on Light Emitting Diodes in Optical Wireless Communications
Author :
Sohail, Muhammad ; Sterckx, Karel L. ; Saengudomlert, Poompat
Author_Institution :
Sch. of Eng. & Technol., Telecommun., Pathumthani, Thailand
Abstract :
Light Emitting Diodes (LEDs) have a wide range of applications, including illumination and data transmission in Optical Wireless Communications (OWC) systems. Analog modulation used in Orthogonal Frequency Division Multiplexing (OFDM) to overcome Inter-Symbol Interference (ISI) suffers from significant nonlinear distortion when voltage modulation is applied to LEDs. We investigate and analyze current modulation techniques on LEDs. Based on transconductance, MOSFET and BJT are used to transform an input signal voltage to a forward current. The performances of MOSFET-based and BJT-based transconductance circuits for current modulation are investigated and compared in terms of the linear current modulating range for LEDs.
Keywords :
OFDM modulation; data communication; intersymbol interference; light emitting diodes; nonlinear distortion; optical communication; BJT-based transconductance circuits; ISI; LED; MOSFET-based transconductance circuits; OFDM; OWC systems; analog modulation; data transmission; intersymbol interference; light emitting diodes; linear analog current modulation; nonlinear distortion; optical wireless communications; orthogonal frequency division multiplexing; voltage modulation; Frequency conversion; IEEE Lasers and Electro-Optics Society; MOSFET; OFDM; Optical transmitters; Transconductance; Wireless communication; Analog modulation; light emitting diodes; optical wireless communications; orthogonal frequency division multiplexing; transconductance circuits;
Conference_Titel :
Electrical Engineering Congress (iEECON), 2014 International
Conference_Location :
Chonburi
DOI :
10.1109/iEECON.2014.6925848
