Resource allocation and cross-layer optimization in wireless networks

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Wireless technologies have seen tremendous success over the years and wireless networks have now become increasingly popular due to their fast and inexpensive deployment and their capabilities of providing flexible and ubiquitous Internet access. While the majority of existing wireless networks are still exclusively confined to single hop access, it is the ability of these networks to forward packets over multihop wireless paths which enabled them to easily extend the coverage area. This convenience has led the IEEE 802.11 to emerge from individual homes to large scale deployments in environments covering medium to large enterprises, apartment complexes and housing developments, as well as public area hot spots (e.g., airports, highway rest areas, coffee shops, etc.). As more users depend on such networks as their primary source for Internet access, there is an increasing expectation that these networks should provide reliable and high end-to-end throughput. Unfortunately, achieving good multihop throughput has been challenging due to factors, such as lossy wireless links caused by interference from concurrent transmissions, and intra-path interference caused by transmissions on successive hops along a single path. The proposed work will provide a fundamental understanding of the capabilities and limitations of multihop and wireless mesh networks and will present solutions to improving their capacity through improving the spectrum spatial reuse and using smart antennas. We will therefore develop practical algorithms with strong theoretical foundation which will achieve significant performance improvements for multihop and wireless mesh networks that are essential for providing reliable wireless access to the Internet.