A Bi-Directional Visible Light Communication System Based on DTMB-A

In this paper, we propose a new method to realize bidirectional visible light communication (VLC). We implement the bi-directional VLC system based on digital television terrestrial multimedia broadcasting-advanced (DTMB-A) and apply time-domain synchronous OFDM (TDS-OFDM) in the physical layer. A new type of APSK constellation with Gray mapping is used to provide a considerable shaping gain in both the independent demapping and the iterative demapping. Our system realizes the goal of bi- directional transmission between the station and the train, by which we could download driving data conveniently instead of getting on the vehicle. We also measure the output spectrum of photodetector and present our analysis. Through the experiment testing, the download rate of this bi-directional VLC system can achieve 63.67 Mb/s and the physical layer rate can reach 180Mb/s when two computers are connected through our system within the distance of 0.1m. With transmission distance exceeding 0.1m, the signal using 256APSK constellation mapping and 1/2 code rate can still be normally demodulated.

[1]  Joseph M. Kahn,et al.  Comparison of Orthogonal Frequency-Division Multiplexing and Pulse-Amplitude Modulation in Indoor Optical Wireless Links , 2012, IEEE Transactions on Communications.

[2]  J. Anatory,et al.  Channel Model for Broadband Power-Line Communication , 2007, IEEE Transactions on Power Delivery.

[3]  Jian Song,et al.  Reception Quality Prediction in a Single Frequency Network for the DTMB Standard , 2012, IEEE Transactions on Broadcasting.

[4]  M. Nakagawa,et al.  Performance evaluation of narrowband OFDM on integrated system of power line communication and visible light wireless communication , 2006, 2006 1st International Symposium on Wireless Pervasive Computing.

[5]  Nan Chi,et al.  875-Mb/s asynchronous bi-directional 64QAM-OFDM SCM-WDM transmission over RGB-LED-based visible light communication system , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[6]  S. Randel,et al.  Broadband Information Broadcasting Using LED-Based Interior Lighting , 2008, Journal of Lightwave Technology.

[7]  Wang Guoqing,et al.  Approximate models for CCN data transfer in general topology , 2014, China Communications.

[8]  Cheng Ta.  Comparison of Key Technologies in DVB-T2 and DTMB-A , 2014 .

[9]  Joachim Walewski,et al.  High-Speed Wireless Indoor Communication via Visible Light , 2007 .

[10]  John Newbury,et al.  Power line communications : theory and applications for narrowband and broadband communications over power lines , 2010 .

[11]  Luc Martens,et al.  SFN gain in broadcast networks , 2011, 2011 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB).

[12]  Jeffrey B. Carruthers,et al.  Wireless infrared communications , 2003, Proc. IEEE.

[13]  Zhixing Yang,et al.  APSK Constellation with Gray Mapping , 2011, IEEE Communications Letters.

[14]  Ralf Lehnert,et al.  Broadband powerline communications networks : network design , 2004 .