I want ppt for Halo network and only the understandable language can u provide me that soon please

The markets of broadband, wireless, and multimedia
network services are growing rapidly. Those markets are
demanding infrastructure that can be quickly and
economically deployed. Services must be delivered to
businesses and consumers, the end users of the network, at
affordable prices. Qualify of Service (QoS) must be
guaranteed. And, the information bandwidth must increase
dynamically to the needs of the end user with an
imperceptible latency following a request for more
bandwidth, if not in real time.
Innovative communications networks are being pioneered.
The High Altitude Long Operation (HALO) network is a
broadband wireless Metropolitan Area Network (MAN)
consisting of HALO aircraft operating at high altitude and
carrying an airborne communications network hub, with
network elements on the ground.
The HALO network combines the advantages of two wellestablished
wireless communication services: satellite
networks and terrestrial wireless networks like cellular and
personal communication systems. Satellite networks,
including those being developed, as well as those proposed,
for operating at Low Earth Orbit (LEO), Medium Earth Orbit
(MEO), High Elliptic Orbit (HEO), and Geosynchronous
Earth Orbit (GEO), have advantages such as free-space-like
channels with Ricean fading and high look angles (line of
sight). But, their disadvantages include expensive high-power
user terminals, long propagation delays, and stagnant
performance growth. And, system capacity is practically
fixed and can be increased typically only by adding satellites.
In contrast, terrestrial wireless networks have advantages
such as low-cost low-power user terminals, short propagation
delay, and good scalability of system capacity. However,
their disadvantages include low look angles, multipath
channels with Rayleigh fading, and complex infrastructures.
They require many base stations that must be inter-linked
over cables or microwave links in order to backhaul
aggregated traffic. Cell-splitting, to add system capacity,
requires reengineering of the network.
The HALO network will be located in the stratosphere at
an altitude between terrestrial wireless and satellite networks.
It will provide broadband services to businesses and to small
officeshome offices in an area containing a typical large city
and its neighboring towns. To each end user, it will offer an
unobstructed line of sight and a free-space like channel with
short propagation delay, and it will allow the use of lowpower
low-cost user terminals.
The HALO network infrastructure is simple, having a star
topology with a single central hub. Consequently, the
deployment of service to the entire metropolitan area can
occur on the first day the network is deployed, and the
subsequent maintenance cost is expected to be low. The
system capacity can be increased by decreasing the size of
beam spots on the ground while increasing the number of
beams within the signal footprint, or by increasing the signal
bandwidth per beam. The HALO network can interface to
existing networks. It can operate as a backbone to connect
physically separated LANs (Local Area Networks) through
frame relay adaptation or directly through LAN bridges and
routers. It can also provide videoconference links through
standard ISDN or T1 interface hardware.
The remainder of the paper is organized in four additional
sections. In Section 11, we present a conceptual system
architecture of the HALO network and a corresponding
reference model is proposed in Section 111. We describe the
simulation model and results in Section IV and conclude the
paper in Section IV.