TY  - GEN
N1  - This version is the author accepted manuscript. For information on re-use, please refer to the publisher?s terms and conditions.
EP  - 6
AV  - public
Y1  - 2018/01/01/
TI  - Undersampled Pulse Width Modulation for Optical Camera Communications
KW  - Optical camera communications
KW  -  undersampled pulse width modulation
KW  -  visible light communications
A1  - Luo, P
A1  - Jiang, T
A1  - Haigh, PA
A1  - Ghassemlooya, Z
A1  - Zvanovec, S
T3  - IEEE International Conference on Communications Workshops
CY  - Kansas City, MO, USA
SN  - 2164-7038
PB  - IEEE
UR  - http://dx.doi.org/10.1109/ICCW.2018.8403732
ID  - discovery10059302
N2  - An undersampled pulse width modulation (UPWM) scheme is proposed to enable users to establish a non- flickering optical camera communications (OCC) link. With UPWM, only a digital light emitting diode (LED) driver is needed to send signals using a higher order modulation. Similar to other undersample-based modulation schemes for OCC, a dedicated preamble is required to assist the receiver to indicate the phase error introduced during the undersampling process, and to compensate for nonlinear distortion caused by the in-built gamma correction function of the camera. To test the performance of the UPWM- based OCC system, an experimental test-bed is developed. The experimental results show that the proposed system is able to achieve a data rate of 150 bps (spectrum efficiency of 5 bits/symbol) at a bit error rate of 6.76×10^-4, which is well below the forward error correction limit of 3.8×10^-3, over a link span of 1 m using a Huawei Nexus 6P smartphone with a frame rate of 30 fps.
ER  -