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Accession Number ADA596282
Title High Throughput via Cross-Layer Interference Alignment for Mobile Ad Hoc Networks.
Publication Date Aug 2013
Media Count 57p
Personal Author J. R. Heath
Abstract Recent investigations into the fundamental limits of mobile ad hoc networks have produced a physical layer method for approaching their capacity. This strategy, known as interference alignment, requires cooperation, rather than competition, among the transceivers in the network. Under ideal circumstances, every user can achieve reliable communication at rates approaching one half of the interference-free capacity. Unfortunately, prior research on interference alignment makes many assumptions that make it difficult to realize interference alignment in practice. This report summarizes the PI's work on realizing interference alignment in multiple-input multiple-output (MIMO) communication channels. The emphasis is on networks where clusters of users cooperate together, since this provides a good balance between network overhead and performance. One contribution was to devise a way to add new users to an existing cluster of interference aligned users. Different algorithms were devised as a function of the number of antennas in the network. Another contribution was to analyze interference alignment in a network with random clusters of users. The cases where interference alignment was preferred to other simpler communication strategies was characterized. Another contribution was to determine the impact of distributing the antennas. It was found that distributed antennas lead to higher performance with interference alignment, and new algorithms were designed to achieve that performance. A final contribution was to prototype an interference alignment network. A distributed prototype was constructed with over-the-air synchronization and feedback, demonstrating the viability of interference alignment for small networks in practice.
Keywords Antennas
Communication and radio systems
Communications networks
Interference alignment
Transmitter receivers
User needs
Wireless communications

Source Agency Non Paid ADAS
NTIS Subject Category 45C - Common Carrier & Satellite
Corporate Author Texas Univ. at Austin.
Document Type Technical report
Title Note Final rept. 1 Sep 2010-31 Aug 2014.
NTIS Issue Number 1416
Contract Number W911NF-10-1-0420

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