Abstract
We propose and experimentally demonstrate a 2 × 2 imaging
multiple-input-multiple-output (MIMO) Nyquist single carrier visible light
communication (VLC) system based on spectral efficient 64/32-ary quadrature
amplitude modulation, as well as pre- and post-equalizations. Two commercially
available red-green-blue light-emitting diodes (LEDs) with 3 dB bandwidth of 10 MHz
and two avalanche photodiodes with 3 dB bandwidth of 100 MHz are employed. Due to
the limited experiment condition, three different colors/wavelengths are transmitted
separately. The achieved data rates of red, green, and blue LED chips are 1.5, 1.25,
and 1.25 Gb/s, respectively. The resulting bit error ratios are below the 7%
pre-forward error correction limit of 3.8 × 10-3 after 75 cm indoor transmission. To
the best of our knowledge, this is the first experimental investigation of imaging
MIMO system, and it is the highest data rate ever achieved in MIMO VLC system.
© 2014 Chinese Optics Letters
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