Oregon State University

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MS Final Oral Examination ā€“ Adem Zaid


Monday, November 28, 2011 3:00 PM - 5:00 PM

Enhancing Macrocell Downlink Performance Through Femtocell User Cooperation
Femtocells are low-power base stations with small communication coverage designed and targeted for home and small business use. Due to their low cost, their ability to provide high data rates, and to their low power consumption, they have recently attracted considerable research attention at both academic and industry. About 50% of phone calls and about 70% of data communication are projected to be taking place indoors in the next few years. In addition to offering high data-rate services at low power usage, femtocells can potentially reduce the traffic load on traditional macrocellular networks by servicing macrocell users which happen to be under their coverage. Femtocell deployment, however, still presents some major challenges, pertaining mainly to interference and handoff.

This thesis studies cooperative techniques that rely on femtocell user diversity to improve the downlink communication quality of macrocell users. We analytically analyze and evaluate the achievable performance of these techniques in the downlink case when the fading channels are Rayleigh distributed. We provide an approximation of both the bit-error rate (BER) and the data throughput that macrocell users receive with femtocell usersā€™ cooperation. Using simulations, we show that under reasonable SNR values, cooperative schemes enhance the performances of macrocells by improving the BER, outage probability and data throughput of macrocell users significantly when compared with the traditional, non-cooperative schemes.

Major Advisor: Bechir Hamdaoui
Committee: Alan Fern
Committee: Alan Wang
GCR: Leonard Coop


Kelley Engineering Center (campus map)
3057
Ferne Simendinger
1 541 737 2889
ferne at eecs.oregonstate.edu
Sch Elect Engr/Comp Sci
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