CIF: Medium:Collaborative Research: Explicit Codes for Efficient Operation of

CIF：媒介：协作研究：高效运行的显式代码

• 批准号: 0964500
• 负责人: Xiang-Gen Xia
• 金额: $ 24.25万
• 依托单位: University of Delaware
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-15 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0964500&HistoricalAwards=false
• 关键词: CIF; Medium; Collaborative; Research; Explicit

This project deals with models of wireless multi-terminal networks incorporating practical constraints such as individual links that experience fading, applications that are delay-sensitive, network communication that is subject to broadcast and interference constraints and nodes that are constrained to operate in half-duplex mode. The network is assumed to be static for the duration of the message, but can change from one message to the next and channel-state information is assumed to be present only at the receiver. In such settings, cooperative communication in which intermediate nodes facilitate communication between a particular source-sink pair, is key to efficient operation of the network.A key goal of any communication system, is one of achieving an optimal rate-reliability tradeoff. The diversity-multiplexing gain tradeoff (DMT) determines the tradeoff between relevant first-order approximations to the rate and reliability of communication. The DMT of point-to-point communication links has been extensively studied and signal sets are available that are optimal under any statistical distribution of the fading channel. There now exist protocols and codes for two-hop relay networks that come close to achieving the corresponding min-cut upper bound on DMT. Goals of this project include: 1) determining the DMT of various classes of multiterminal networks ranging from broadcast, cooperative-broadcast and multiple-access channel networks to layered multi-hop networks; 2) identifying the classes of networks for which the DMT of the network is given by the DMT of the min-cut; 3) assessing the impact of asynchronous operation of the network, as well as of the presence of feedback along one or more links in the network; 4) the construction of codes with lesser decoding complexity.

该项目涉及无线多终端网络模型，其中包含实际约束，例如经历衰落的单个链路、对延迟敏感的应用、受广播和干扰约束的网络通信以及仅限于在半双工模式下运行的节点。假设网络在消息持续时间内是静态的，但可以从一个消息改变到下一个消息，并且假设信道状态信息仅存在于接收器处。 在这种设置中，中间节点促进特定源-宿对之间的通信的协作通信是网络高效运行的关键。任何通信系统的关键目标是实现最佳速率-可靠性权衡。 分集复用增益权衡（DMT）决定了通信速率和可靠性的相关一阶近似之间的权衡。 点对点通信链路的 DMT 已得到广泛研究，并且可以得到在衰落信道的任何统计分布下最优的信号集。 现在存在用于两跳中继网络的协议和代码，它们接近于实现 DMT 上相应的最小割上限。 该项目的目标包括： 1) 确定各类多终端网络的 DMT，范围从广播、合作广播和多址信道网络到分层多跳网络； 2) 识别网络的类别，网络的 DMT 由最小割的 DMT 给出； 3) 评估网络异步操作的影响，以及网络中一个或多个链路上反馈的存在； 4) 解码复杂度较低的代码构造。