Rapid Development of System-on-Chip (SoC) for Network-Enabled Visible Light Communications

Abstract

Abstract-Visible Light Communication (VLC) is an emerging optical communication technology with rapid development nowadays. VLC is considered as a compliment and successor of radio-frequency (RF) wireless communication. There are various typical implementations of VLC in which one of them is for exchanging data TCP/IP packets, thus the user can browse the internet as in established Wireless fidelity (Wi-Fi) technology. Briefly, we can call it by Light fidelity (Li-Fi). This paper described the design and implementation of System-on-Chip (SoC) subsystem for Li-Fi application where the implemented SoC consists of hardware (H/W) and software (S/W). In the H/W aspect, Physical Layer (PHY) is made by using UART communication with Ethernet connection to communicate with Host/Device personal-computer (PC). In the S/W aspect, Xillinux operating system (OS) is used. The H/W-as well as S/W-SoC, are realized in FPGA Zybo Zynq-7000 EPP development board. The functional test result shows (without optical channel or Zybo-to-Zybo only) that the implemented SoC is working as expected. It is able to exchange TCP/IP packets between two PCs. Moreover, Ethernet connection has bandwidth up to 83.6 Mbps and PHY layer baud rate has bandwidth up to 921600 bps.

Modelling the OFDM-based PHY Layer in SoC for Visible Light Communication

“…In [3], the maximum throughput of 26.8 Kb/s was achieved by using a QPSK modulation scheme. In reference [4], a network-enabled VLC system prototype was carried out in the Zynq-7000 SoC platform. The system consists of peripherals such as USB, Ethernet, etc.…”

“…The system designed in [4] can reach a throughput about 900 Kb/s. In this short paper, we report an SoC model for OFDM-based VLC system.…”

“…Different from Ref. [4] that uses no modulation scheme (directly fed from UART), we used the OFDM modulation for this work.…”

Noise and Bandwidth Consideration in Designing Op-Amp Based Transimpedance Amplifier for VLC

“…There are several interesting topics which are extensively discussed, such as: a. Modulation scheme: Pulse Width Modulation [4]- [7], Pulse Position Modulation [8], Binary Phase-shift Keying [9][10], Quadrature Phase-shift Keying [11], Quadrature Amplitude Modulation [12] and etc; b. Analog front-end (AFE) design: AFE circuit [13]- [14], analog filter circuits [15]- [16], automatic gain controller design [17]- [19], LED driver design [20]- [24], TIA [25], and etc. ; c. VLC's noise investigation: [26]- [28]; d. Digital signal processing (DSP): DSP prototyping [29], Viterbi encoder [30]- [31], system-on-chip (SoC) [32][33], and etc. ; e. Simulation model [34]; f. The applications: robotics [35], transportation [36], medical devices [37], audio transmission system [38][39], light fidelity [40][41] and etc.…”

Noise and Bandwidth in Operational Amplifiers for Conventional TIAs used in Visible Light Communication

“…• DSP focus: Prototyping of DSP [28], Viterbi encoder [29][30], VLC based SoC [31][32][33], etc. ; • Modeling and Simulation [34];…”