Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 32, Issue 11, Pages 2087-2093Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2014.2320306
Keywords
Light emitting diode (LED); multiple input multiple output (MIMO); single carrier frequency domain equalization (SC-FDE); visible light communication (VLC)
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We experimentally demonstrate a high-speed 2 x 2 non-imaging multiple-input multiple-output nyquist single carrier visible light communication system. Two commercially available blue light emitting diodes with 3 dB electrical bandwidth of 10MHz and two avalanche photo diodes with 3 dB electrical bandwidth of 100 MHz are used as transmitters and receivers, respectively. A frequency domain equalization method based on two pairs of time-multiplexed training symbols is proposed, which allows demultiplexing and post-equalization simultaneously processing in one step. Frequency domain averaging and time-domain averaging are also implemented and analyzed in this paper. In this demonstration, the overall data rate is 500 Mb/s. The measured bit error rates for two receivers are both below the 7% pre-forward-error-correction threshold of 3.8 x 10(-3) after 40 cm free-air transmission.
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