Realization of OFDM modulation and demodulation for visible light communication based on FPGA

Abstract

In order to ensure stable, correct and real-time high-speed transmission of indoor visible light communication (VLC), the key modulation and demodulation technologies of orthogonal frequency division multiplexing (OFDM) are studied in this paper. The time-domain synchronization, frequency synchronization and channel equalization of receiver are analyzed and optimized by utilizing short and long training preamble. Moreover, field programmable gate array (FPGA) development board (Xilinx Kintex-7) and Verilog hardware description language are used to realize the design of proposed OFDM-VLC system. Simulation and experiment both verify the feasibility of the hardware designs of this system. The proposed OFDM-based VLC system can process signal in real-time, which can be used in actual VLC application systems.

References

[1] KarunatilakaD, ZafarF, KalavallyV, ParthibanR. IEEE Communications Survey and Tutorials, 2015, 17: 1649

[2] ChenH, WuC, LiH, ChenX, GaoZ, CuiS, WangQ. Journal of Semiconductors, 2016, 37: 011001

[3] WangY, TaoL, HuangX, ShiJ, ChiN. IEEE Photonic Journal, 2015, 7: 7904507

[4] CossuG, WajahatA, CorsiniR, CiaramellaE. 5.6 Gbit/s Downlink and 1.5 Gbit/s Uplink Optical Wireless Transmission at Indoor Distances (=1.5 m), European Conference on Optical Communication, 2014,

[5] VucicJ, KottkeC, NerreterS, ButtnerA, LangerK D, WalewskiJ W. Journal of Lightwave Technology, 2010, 28: 3512

[6] LiH, ZhangY, ChenX, WuC, GuoJ, GaoZ, ChenH. Chinese Optics Letters, 2015, 13: 080605

[7] WangY, HuangX, ZhangJ, WangY, ChiN. Optics Express, 2014, 22: 15328

[8] GB 15629.1101-2006, IEEE Standard for Information Technology-Telecommunications and Information Exchange Between Systems-Local and Metropolitan Area Networks-Specific requirements-Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications.

[9] WangY B. The Study of Visible Wireless Communication System, 2008,

[10] CencioniP, PietroR. VIPER: A Vehicle-to-Infrastructure Communication Privacy Enforcement Protocol, 2007, 1

[11] IEEE 802.15 WPAN Task Group 7 (TG7) Visible Light Communication, The Institute of Electrical and Electronics Engineers, http://www.ieee802.org/15/pub/TG7.html.

[12] YangM. Research on Synchronization of OFDM for Indoor Visible Light Communication, 2010,