Abstract
We present two key system technologies on the two ends of RF spectrum to
support optical-wireless access using radio-over-fiber (RoF) based
distributed antenna system (DAS) for in-building environments. The proposed
technologies can enable protocol-independent, multi-carrier broadband
connectivity to the end users' devices deployed in the in-door facilities by
supporting existing and emerging wireless services with lower radio
frequency carrier (from 500 MHz up to 3 GHz) as well as future-proof very
high throughput (VHT) gigabit wireless services using 60 GHz mm-wave band.
For low frequency wireless services, a broad spectrum band-shifting
technique is experimentally demonstrated to simultaneously transmit
multi-service multiple input multiple output (MIMO) radio signals over
in-building active DAS. This approach facilitates easy upgrading of existing
non-MIMO services to MIMO services or adding future MIMO services in a
simple and cost-effective way. For wireless-VHT service, for the first time
to our knowledge, we demonstrate simultaneous all-optical up-conversion of
multiple, separate gigabit wireless services at 60 GHz and 64 GHz mm-wave
band using one single lightwave transmitter. This scheme can be used to
achieve seamless convergence of very high throughput wireless personal area
network (VHT-WPAN) with more conventional low frequency distributed antenna
based optical-wireless access system.
© 2010 IEEE
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