Abstract
We demonstrate a 60 GHz broadband picocellular Radio-over-Fiber network
architecture that enables seamless connectivity for highly mobile end-users.
Its seamless communication capabilities arise by the supported handover scheme
that relies on a novel Moving Extended Cell (MEC) concept. MEC exploits user-centric
virtual groups of adjacent cells that transmit the same data content to the
user and utilizes a switch mechanism for restructuring the virtual multi-cell
area according to the user's mobility pattern, so that a virtual antenna group
moves together with the mobile user. We present the theoretical formulation
for MEC and show that it can provide zero packet loss and call dropping probability
values in high-rate wireless services for a broad range of mobile speeds up
to 40 m/sec, independently of the fiber link distances. We also demonstrate
the physical layer network architecture and switch mechanism both for a RoF
network with a single 60 GHz radio frequency (RF) over each wavelength, as
well as for a RoF configuration supporting simultaneous multi-RF channel transmission
over each optical wavelength. The performance of the multi-RF-over-$\lambda$ network
implementation is evaluated via simulations showing successful 100 Mb/s radio
signal transmission over fiber links longer than 30 km. To this end, MEC can
enable seamless connectivity and bandwidth guarantees in 60 GHz picocellular
RoF networks being also capable of serving multiple users over the same wavelength
in a RF frequency-division-multiplexed (FDM) approach.
© 2009 IEEE
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