Abstract

$M$ -point combinatory (MC) modulation is proposed for parallel transmission (PT) image sensor (IS)-based visible light communication (VLC). In the conventional PT system, $M_{0}$ discrete signals which incorporate $N=(M_{0}-1)/2$ spatial frequencies are transmitted in parallel with $M_{0}$ transmitting regions of liquid crystal display (LCD). When each of spatial frequencies is modulated with $P$ -ary phase shift keying ( $P$ -PSK), the number of bits transmitted in one frame is given by $k=N \log _{2} P$ bits. $k$ increases when the number of spatial frequencies $N$ increases with $M_{0}$ , but at the same time, the peak-to-average power ratio (PAPR) becomes high because the signal of the PT system is essentially orthogonal frequency modulation, thus remaining at a very low number of spatial frequencies $N$ that the system accommodates without any error. In this paper, we propose MC modulation, which is combined with the PT system to increase the number of bits per frame that the system carries without any error. In the MC PT system, $M$ out of the $M_{0}$ transmitting regions are used for transmitting $M$ discrete signals related to $M$ -point DFT, where $M \leq M_{0}$ . Since there are $\binom{M_{0}}{M}$ ways in choosing $M$ out of the $M_{0}$ ones, we map them to $\ell = \lfloor \log _{2} \binom{M_{0}}{M} \rfloor$ bits. In addition $k$ bits, the total number of bits per frame is $k+\ell$ bits. According to $\ell$ bits, $M$ transmitting regions are chosen for a frame, and then the $M$ chosen ones are used to transmit $M$ discrete signals of the PT system which carries $k$ bits. Our experimental results show that our proposed MC PT system with 8-PSK achieves 697 bits per frame with keeping no error being observed, while the conventional PT system does only 180 bits per frame.

Non-flickering 100 m RGB visible light communication transmission based on a CMOS image sensor

Chi-Wai Chow, Ruei-Jie Shiu, Yen-Chun Liu, Yang Liu, and Chien-Hung Yeh
Opt. Express 26(6) 7079-7084 (2018)

A 160 m visible light communication link using hybrid undersampled phase-frequency shift on-off keying and CMOS image sensor

Muhammad Asim Atta and Amine Bermak
Opt. Express 27(3) 2478-2487 (2019)

Tricolor visible-light laser diodes based visible light communication operated at 40.665 Gbit/s and 2 m free-space transmission

Liang-Yu Wei, Chi-Wai Chow, Guan-Hong Chen, Yang Liu, Chien-Hung Yeh, and Chin-Wei Hsu
Opt. Express 27(18) 25072-25077 (2019)

Efficient demodulation scheme for rolling-shutter-patterning of CMOS image sensor based visible light communications

Chia-Wei Chen, Chi-Wai Chow, Yang Liu, and Chien-Hung Yeh
Opt. Express 25(20) 24362-24367 (2017)

LED-based visible light communication for color image and audio transmission utilizing orbital angular momentum superposition modes

Yuanying Zhang, Jikang Wang, Wuhong Zhang, Shuting Chen, and Lixiang Chen
Opt. Express 26(13) 17300-17311 (2018)