Abstract
Indoor optical wireless systems (OWS) provide an attractive alternative
for realizing next generation home access networks. Homodyne detection can
be employed in order to enhance receiver sensitivity and spectral
efficiency. In this paper, the application of space-time block-coding (STBC)
techniques in a coherent OWS is theoretically and numerically investigated,
taking into account the noise characteristics at the receiver. The
performance of STBC multiple-input multiple-output (MIMO) systems, employing
two transmit elements, is compared against single-input/single-output
systems operating with the same total optical transmit power. It is shown
that STBC is an effective means to increase the capacity of coherent OWS,
improve their coverage, and decrease the required optical power at the
transmitter. These results demonstrate the usefulness of MIMO techniques in
the realization of future optical wireless local area networks.
© 2011 IEEE
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