TY - GEN
T1 - Advanced A-law employing nonlinear distortion reduction in DCO-OFDM systems
AU - Zhang, Xiaojing
AU - Liu, Peng
AU - Liu, Jiang
AU - Liu, Song
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2017/6/28
Y1 - 2017/6/28
N2 - In this paper, an advanced A-law nonlinear companding algorithm is employed to reduce the nonlinear distortions from the light emitting diode (LED) on visible light communication (VLC) systems. The nonlinear transfer characteristics of LEDs are not identical. But the transfer effect of an LED can be modeled as a linear transfer range with the maximum and minimum forward voltages. Therefore, the signal will be truncated when the signal amplitude is larger than the maximum limit or smaller than the minimum limit. The advanced A-law companding algorithm can concentrate the signal amplitude to the limited linear transfer range and decrease the truncation distortion. We evaluate the performance of the proposed advanced A-law companding algorithm comparing with typical A-law and uncompanded schemes via simulations in the direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) system. Experimental results demonstrate that the advanced A-law companding algorithm can effectively alleviate the nonlinear distortion of the DCO-OFDM system in terms of system bit error ratio (BER) performances.
AB - In this paper, an advanced A-law nonlinear companding algorithm is employed to reduce the nonlinear distortions from the light emitting diode (LED) on visible light communication (VLC) systems. The nonlinear transfer characteristics of LEDs are not identical. But the transfer effect of an LED can be modeled as a linear transfer range with the maximum and minimum forward voltages. Therefore, the signal will be truncated when the signal amplitude is larger than the maximum limit or smaller than the minimum limit. The advanced A-law companding algorithm can concentrate the signal amplitude to the limited linear transfer range and decrease the truncation distortion. We evaluate the performance of the proposed advanced A-law companding algorithm comparing with typical A-law and uncompanded schemes via simulations in the direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) system. Experimental results demonstrate that the advanced A-law companding algorithm can effectively alleviate the nonlinear distortion of the DCO-OFDM system in terms of system bit error ratio (BER) performances.
KW - DCO-OFDM
KW - advanced A-law
KW - light emitting diode
KW - nonlinear distortion
KW - visible light communication
UR - http://www.scopus.com/inward/record.url?scp=85025839471&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85025839471&partnerID=8YFLogxK
U2 - 10.1109/ICCChinaW.2015.7961604
DO - 10.1109/ICCChinaW.2015.7961604
M3 - Conference contribution
AN - SCOPUS:85025839471
T3 - 2015 IEEE/CIC International Conference on Communications in China - Workshops, CIC/ICCC 2015
SP - 184
EP - 188
BT - 2015 IEEE/CIC International Conference on Communications in China - Workshops, CIC/ICCC 2015
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2015 IEEE/CIC International Conference on Communications in China - Workshops, CIC/ICCC 2015
Y2 - 2 November 2015 through 4 November 2015
ER -