Resource allocation and cross-layer optimization in wireless networks

多年来，无线技术取得了巨大的成功，由于其快速且廉价的部署以及提供灵活和无处不在的互联网接入的能力，无线网络现在变得越来越受欢迎。虽然大多数现有的无线网络仍然仅限于单跳接入，但正是这些网络在多跳无线路径上转发分组的能力使它们能够轻松地扩展覆盖区域。这种便利性使得IEEE 802.11从个人家庭发展到大规模部署在涵盖大中型企业、公寓和住宅开发以及公共区域热点(例如机场、高速公路休息区、咖啡店等)的环境中。随着越来越多的用户依赖此类网络作为其主要的Internet访问来源，人们越来越期望这些网络能够提供可靠且高的端到端吞吐量。不幸的是，由于诸如来自并发传输的干扰引起的无线链路损耗以及由沿单个路径的连续跳上的传输引起的路径内干扰等因素，实现良好的多跳吞吐量一直是具有挑战性的。这项拟议的工作将提供对多跳和无线Mesh网络的能力和限制的基本理解，并将提出通过改善频谱空间重用和使用智能天线来提高其容量的解决方案。因此，我们将开发具有强大理论基础的实用算法，这些算法将显著提高多跳和无线Mesh网络的性能，这些网络对于提供可靠的互联网无线接入至关重要。

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.