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Coexistence in femtocell-aided cellular architectures

The surest way to increase the capacity of a wireless system is by getting the
transmitters and receivers closer to each other, which creates the dual bene¯ts of
higher quality links and more spatial reuse. In a network with nomadic users, this
inevitably involves deploying more infrastructure, typically in the form of microcells,
hotspots, distributed antennas, or relays. Compared to these deployments, a less
expensive alternative for cellular operators is the recent concept of femtocells { also
called home base-stations { which are end consumer installed data access points in
the desire to get better indoor voice and data coverage. A two-tier network consisting
of a conventional macrocell overlaid with shorter range wireless hotspots o®ers poten-
tial capacity bene¯ts with low upfront costs to cellular operators. This dissertation
addresses the key technical challenges inherent to a femtocell-aided cellular network,
speci¯cally managing radio interference and providing reliable coverage at either tier,
for di®erent physical layer technologies. Speci¯c contributions include 1) an uplink
capacity analysis and interference avoidance in two-tier networks employing Code Di-
vision Multiple Access (CDMA), 2) a decentralized power control scheme in two-tier
networks with universal frequency reuse, 3) a coverage analysis of multi-antenna two-
tier networks, and 4) spectrum allocation in two-tier networks employing Orthogonal
Frequency Division Multiple Access (OFDMA). The goal of this research is to inspire and motivate the use of decentralized interference management techniques requir-
ing minimal network overhead in ongoing and future deployments of tiered cellular
architectures. / text

Identiferoai:union.ndltd.org:UTEXAS/oai:repositories.lib.utexas.edu:2152/7543
Date01 June 2010
CreatorsChandrasekhar, Vikram
Source SetsUniversity of Texas
LanguageEnglish
Detected LanguageEnglish
Formatelectronic
RightsCopyright is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.

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