CAREER: Cooperative Communication Systems: Resource Allocation, Self-Organization, and Synchronization

职业：协作通信系统：资源分配、自组织和同步

• 批准号: 0447743
• 负责人: Donald Brown
• 金额: --
• 依托单位: Worcester Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-01-15 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0447743&HistoricalAwards=false
• 关键词: CAREER; Cooperative; Communication; Systems; Resource

The key to reliable communications over wireless channels is diversity. Of the various methods used to achieve diversity, spatial diversity through the use of multiple transmit and/or receive antennas is particularly attractive in that it does not require additional bandwidth or loss of transmission rate. Spatial diversity does, however, require the use of multiple antennas which must be separated by at least a few wavelengths in order to be effective. This physical constraint precludes the use of spatial diversity in many scenarios, but recently, researchers considered this problem in the context of multiuser communication systems in which there may be multiple sources and/or destinations each with only a single antenna. In these types of systems, communicating nodes can form "partnerships" to achieve a new kind of spatial diversity: "user cooperation diversity". Nodes in a partnership pool their antenna resources to form a virtual antenna array and many of the benefits of spatial diversity are achieved without the need for a "real" antenna array.While user cooperation diversity can provide many of the advantages of antenna arrays to devices that would otherwise only have access to a single antenna, the implementation issues are significantly different than those of antenna arrays. Unlike a traditional antenna array, the nodes in a cooperative partnership are at least semi-autonomous in the sense that they each typically have their own local resources, quality-of-service requirements, and timing references. This project is centered around the questions created by the inherent autonomy of nodes in cooperative multiuser communication systems: how to initiate and maintain cooperative partnerships, how to optimally allocate resources in cooperative partnerships, and how to synchronize cooperating nodes.

无线信道上可靠通信的关键是分集。在用于实现分集的各种方法中，通过使用多个发射和/或接收天线来实现空间分集特别有吸引力，因为它不需要额外的带宽或传输速率的损失。然而，空间分集确实需要使用多个天线，这些天线必须至少分开几个波长才能有效。这种物理限制排除了在许多场景中使用空间分集的可能性，但最近，研究人员在多用户通信系统的背景下考虑了这个问题，在多用户通信系统中，可能存在多个信源和/或目的地，每个信源和/或目的地都只有一个天线。在这类系统中，通信节点可以结成伙伴关系，实现一种新的空间分集：用户合作分集。伙伴关系中的节点将他们的天线资源集中在一起形成一个虚拟的天线阵列，空间分集的许多好处都是在不需要真正的天线阵列的情况下实现的。虽然用户合作分集可以将天线阵列的许多优势提供给原本只能访问单个天线的设备，但实现问题与天线阵列的那些显著不同。与传统的天线阵列不同，协作伙伴关系中的节点至少是半自治的，因为它们每个通常都有自己的本地资源、服务质量要求和定时参考。本课题围绕着协作多用户通信系统中节点固有的自主性所产生的问题：如何发起和维护协作伙伴关系，如何在协作伙伴关系中优化资源分配，以及如何同步协作节点。