Abstract
In this paper, we propose a mobile optical wireless system that employs
beam delay adaptation, and makes use of our previously introduced beam angle
and power adaptation multibeam spot diffusing configuration in conjunction
with an imaging receiver. Our ultimate goal is to improve the bandwidth, reduce
the effect of intersymbol-interference, and increase the signal-to-noise ratio
(SNR) when the transmitter operates at a higher data rate under the impact
of multipath dispersion, background noise, and mobility. A significant reduction
in the delay spread can be achieved compared to a conventional diffuse system
(CDS) when an imaging receiver replaces a nonimaging receiver at the room's
corner, where the delay spread is reduced from 2.4 ns to about 0.35 ns. Our
proposed system, beam delay, angle, and power adaptation in a line strip multibeam
spot diffusing configuration (BDAPA-LSMS), offers a reduction in delay spread
by a factor of more than 10 compared with only the beam angle and power adaptation
LSMS. An increase in channel bandwidth from 36 MHz (CDS) to about 9.8 GHz
can be achieved when our methods of beam delay, angle, and power adaptation
coupled with an imaging receiver are employed. These improvements enhance
our system and enable it to operate at a higher data rate of 10 Gb/s. At a
bit rate of 30 Mb/s, our proposed BDAPA-LSMS achieves about 50 dB SNR gain
over conventional diffuse systems that employ a nonimaging receiver (CDS).
Moreover, our simulation results show that the proposed BDAPA-LSMS at a bit
rate of 10 Gb/s achieves about 32.3 dB SNR at the worst communication path
under the presence of background noise and mobility while achieving a bit
error rate below 10<sup>-9</sup>.
© 2012 IEEE
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