I work on the application of digital signal processing algorithms
to communications systems. Most of my work has focussed on
wireless communication networks.
Proactive resource allocation.
Dynamic estimator allows for location prediction.
Future needs of mobiles can be predicted.
Channels, data routes, and power.
Networks can be run more efficiently with less resources.
Outdoors, location of radio terminals is efficiently and accurately performed using GPS recievers. Indoors, however, the peformance of GPS receivers is signficantly degraded. My research group is developing techniques for accurate radiolocation of wireless terminals. In particular, my group has developing methods for accurately locating handheld terminals.
We have developed methods that allow us to locate handheld terminals to within 3 metres of their true location more than 80 \% of the time.
This work is supported with grants from NSERC, Bell Canada, and Nokia Products, Ltd.
Mobile terminal location has attracted much interest for emergency
communications, location sensitive browsing, and resource allocation. The
topic of my Ph.D. thesis was location estimation based on propagation distance
measurements from fixed location base stations. The relationship between the
measurements and terminal location is complicated by so-called Non Line of
Sight (NLOS) propagation when the shortest distance straight-line path from
receiver to transmitter is obstructed, multipath propagation, receiver noise,
and interference noise.
New location algorithms were develped using non-parametric estimation and
adaptive filters. The new methods allow for location prediction in resource
allocation algorithms to facilitate efficient cellular networks to carry more
data using less bandwidth. The graph below shows the comparison of my
filtering algorithm, called the multi-model filter, with a standard single
Kalman filter approach, and location estimation without any filter, called zero
A copy of some slides describing my past research and areas I hope to
investigate in the future is available
A poster describing the dynamic model-based filtering algorithm I
developed during my PhD is available here.