Abstract
This paper demonstrates the merit and de-merit of a low complexity, multiple transmitter generalised
space shift keying (GSSK) signalling technique for short range indoor visible light communications. To illustrate the
high spectral efficiency credential of GSSK, an array of
$N_{{\rm t}}$
white light emitting diodes (LEDs) is used to demonstrate
$N_{{\rm t}}$
bits/symbol transmission by exploiting the natural differences in the channel gains of the spatially
separated LED array. With two low power white LEDs each having a
${3}$
dB modulation bandwidth of
${8}$
MHz, data
transmission of up to
${40}$
Mbits/s (
${20}$
Mbaud) is demonstrated. For an average received
electrical signal power of
${-12.5}$
dBm and
$2\times 10^{4}$
data symbols, the measured symbol error rate at
${20}$
Mbaud is
$7 \times
10^{-2}$
and
$5 \times 10^{-5}$
at
${10}$
Mbaud (
${20}$
Mbits/s) without any error control coding. The GSSK technique is experimentally shown to be most
suitable for a fixed configuration as its performance is quite sensitive to receiver mobility.
© 2014 IEEE
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