| dc.description.abstract | Location Based Systems are now a ubiquitous part of
everyday life, seamlessly assisting us in everything we do from
driving our cars to finding a cab, even preventing us missing our
bus or train stop when oversleeping whilst on one. Global
Positioning System (GPS) being the culmination of research in
this area, and the technology of choice for outdoor location based
systems today. Since then there have been significant inroads
made in the development of Indoor Positioning Systems that
attempt to mirror the success of its outdoor big brother
equivalent. There are however some obvious barriers that
currently stifle this aspiration, primarily the topography of an
indoor location with its many walls, doors, pillars, ceilings and
floors, distorting the signals to\from mobile devices and their
tracking devices. The characteristically noisy behavior of wireless
channels, Bluetooth devices, cordless phones, microwaves etc. can
cause interference as they all operate in the same band as Wi-Fi
devices, namely 2.4 GHz, while water and human bodies absorb
RF signals at that frequency. Furthermore the limited range of
tracking devices such as Wireless Access Points (APs), and the
restrictions surrounding their positioning within a building
further exacerbate this issue. This paper advocates a solution to
some of these issues, proposing a method to extend the range of
Indoor Location Based Systems using Mobile Devices at the
extremities of Cells who ‘know’ their | en |
