TY - GEN
T1 - Efficient transmission under low dimming control levels in indoor visible light communications
AU - You, Xiaodi
AU - Chen, Jian
AU - Yu, Changyuan
AU - Ghassemlooy, Zabih
PY - 2016/9/21
Y1 - 2016/9/21
N2 - In indoor visible light communication (VLC) systems based on orthogonal frequency division multiplexing (OFDM), employing multi-pulse position modulation (MPPM) for dimming control will affect the receiver (Rx) sensitivity requirement particularly at low dimming levels (DLs), thus affecting the system bit error rate (BER) performance. In this paper, we propose a hybrid visible light (VL) and infrared (IR) link, where the IR is used for downlink when the DL for VLC is very low. The 'off' periods of MPPM is utilized for data transmission without affecting the illumination level. This arrangement will ensure data transmission under all illumination and dark conditions. Numerical results show that by adopting the IR link, low level M-ary quadrature amplitude modulation can be always used. At low DLs, both the Rx sensitivity requirement of the VL signal and the required transmit power can be significantly alleviated while keeping a constant data rate at a BER < 10-3.
AB - In indoor visible light communication (VLC) systems based on orthogonal frequency division multiplexing (OFDM), employing multi-pulse position modulation (MPPM) for dimming control will affect the receiver (Rx) sensitivity requirement particularly at low dimming levels (DLs), thus affecting the system bit error rate (BER) performance. In this paper, we propose a hybrid visible light (VL) and infrared (IR) link, where the IR is used for downlink when the DL for VLC is very low. The 'off' periods of MPPM is utilized for data transmission without affecting the illumination level. This arrangement will ensure data transmission under all illumination and dark conditions. Numerical results show that by adopting the IR link, low level M-ary quadrature amplitude modulation can be always used. At low DLs, both the Rx sensitivity requirement of the VL signal and the required transmit power can be significantly alleviated while keeping a constant data rate at a BER < 10-3.
KW - dimming control
KW - infrared downlink
KW - multi-pulse position modulation
KW - orthogonal frequency division multiplexing
KW - Visible light communications
UR - https://www.scopus.com/pages/publications/84991734884
U2 - 10.1109/CSNDSP.2016.7573899
DO - 10.1109/CSNDSP.2016.7573899
M3 - Conference contribution
AN - SCOPUS:84991734884
T3 - 2016 10th International Symposium on Communication Systems, Networks and Digital Signal Processing, CSNDSP 2016
BT - 2016 10th International Symposium on Communication Systems, Networks and Digital Signal Processing, CSNDSP 2016
PB - IEEE
T2 - 10th International Symposium on Communication Systems, Networks and Digital Signal Processing, CSNDSP 2016
Y2 - 20 July 2016 through 23 July 2016
ER -