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
| Identifer | oai:union.ndltd.org:UTEXAS/oai:repositories.lib.utexas.edu:2152/7543 |
| Date | 01 June 2010 |
| Creators | Chandrasekhar, Vikram |
| Source Sets | University of Texas |
| Language | English |
| Detected Language | English |
| Format | electronic |
| Rights | Copyright 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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