Outage Constrained Transmit Approaches in Gaussian MIMO Relay Networks (OCTAGON)

高斯 MIMO 中继网络 (OCTAGON) 中的中断约束传输方法

• 批准号: 245947903
• 负责人: Dr.-Ing. Michael Joham
• 金额: --
• 依托单位: Lehrstuhl für Methoden der Signalverarbeitung (MSV)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/245947903?language=en
• 关键词: Outage; Constrained; Transmit; Approaches; Gaussian

Cooperative communications using multi-antenna relay nodes constitutes an important technology of future wireless networks to reliably convey information to a growing number of mobile users. In contrast to the well understood (multi-antenna) point-to-point channel, multiple-access channel, and broadcast channel, the field of cooperative communications where source(s) send messages to destination(s) with the help of assisting nodes (relays) still offers a rich set of challenges. Even if perfect CSI is assumed, the capacity of the simplest cooperative communication element, the three-node relay channel is still unknown. Therefore, the literature on relay channels is in general restricted to information-theoretic upper and lower capacity bounds. The even more complex assumption of fading channels further limits the state-of-the-art performance analysis to simplified scenarios and diversity-multiplexing tradeoff studies.In this research project, we intend to study (multi-antenna) Gaussian relay channels, assuming that only imperfect CSI is available at the transmitting nodes while the receiving nodes are aware of the channel states that are required for reliable decoding. After gaining knowledge for the basic three-node relay channel, we will investigate the multiple-access relay channel (MARC), where multiple sources convey information to one destination with the help of a single relay, the broadcast relay channel (BRC), where one source transmits information to multiple destinations with the help of a relay node, as well as networks where multiple relays support the communication from one source to one destination.Whereas the ergodic rate is the most important performance metric for fast fading channels, we focus on the case of slow fading, where the key event of interest is outage. In particular, we plan to study the maximization of the achievable rate(s) subject to a given upper bound on the outage probability in multi-antenna relay systems. Since the outage capacity (the maximum rate at a certain outage probability) is unknown, achievable lower bounds based on (partial) decode-and-forward (DF) schemes and an upper bound based on the cut-set-bound (CSB) will be investigated. The resulting chance constrained problem formulations are still difficult due to missing or too complex closed-form representations of the outage probabilities. Therefore, conservative and optimistic approximations of the probabilistic expressions have to be found in order to solve the optimizations with respect to the transmit covariance matrices and, therewith, bound the outage capacity of the three-node relay channel (with and without half-duplex constraints) and the multiple relay scenario. For the even more difficult multi-user scenarios, i.e., the MARC and the BC, the objective is to characterize the outage capacity region via inner bounds based on (partial) DF and an outer bound based on the CSB.

使用多天线中继节点的协作通信构成了未来无线网络的重要技术，以可靠地向越来越多的移动的用户传送信息。与众所周知的（多天线）点对点信道、多址信道和广播信道相反，源在辅助节点（中继）的帮助下向目的地发送消息的协作通信领域仍然存在丰富的挑战。即使假设理想的CSI，最简单的协作通信单元，三节点中继信道的容量仍然是未知的。因此，中继信道的文献一般限于信息理论的容量上限和下限。衰落信道的更复杂的假设进一步限制了国家的最先进的性能分析，简化的场景和分集复用的权衡studies.In这个研究项目中，我们打算研究（多天线）高斯中继信道，假设只有不完美的CSI是可用的在发送节点，而接收节点都知道的信道状态，需要可靠的解码。在获得基本的三节点中继信道的知识之后，我们将研究多址接入中继信道（MARC），其中多个源在单个中继的帮助下将信息传送到一个目的地，广播中继信道（BRC），其中一个源在中继节点的帮助下将信息传送到多个目的地，以及多个中继支持从一个源到一个目的地的通信的网络。而遍历速率是快衰落信道的最重要的性能度量，我们专注于慢衰落的情况，其中感兴趣的关键事件是断电。特别是，我们计划研究的最大化的可达速率（S）的中断概率在多天线中继系统的给定上限。由于中断容量（在一定的中断概率的最大速率）是未知的，可实现的下限的基础上（部分）解码和转发（DF）计划和上限的割集界（CSB）的基础上进行调查。由此产生的机会约束问题配方仍然是困难的，由于丢失或过于复杂的封闭形式表示的中断概率。因此，保守和乐观的概率表达式的近似必须找到，以解决相对于发送协方差矩阵的优化，并与之，约束的中断容量的三节点中继信道（有和没有半双工约束）和多个中继场景。对于甚至更困难的多用户场景，即，的MARC和BC，其目的是通过内部边界的基础上（部分）DF和外部边界的基础上的CSB的停电容量区域的特征。