论文标题

依赖不完美的通道估计的空间相关的通道上的太空间合作:上行链路性能分析和优化

Space-Terrestrial Cooperation Over Spatially Correlated Channels Relying on Imperfect Channel Estimates: Uplink Performance Analysis and Optimization

论文作者

Van Chien, Trinh, Lagunas, Eva, Hoang, Tiep M., Chatzinotas, Symeon, Ottersten, Björn, Hanzo, Lajos

论文摘要

为了响应无线流量的快速增长,已经出现了整个创新技术和架构。本文研究了一种集成的网络设计,该设计通过无线接入点(AP)和卫星之间的合作来提高系统容量,以提高网络的光谱效率。我们首先在数学上得出上行链路(UL)数据传输的可实现的吞吐量表达,这是在空间相关的里奇亚通道上的。我们的通用可实现的吞吐量表达适用于在现实的不完美通道估计下进行任意接收的信号检测技术。然后,当使用最大比率组合来检测所需的信号时,将获得Ergodic UL数据吞吐量的封闭式表达。至于我们的资源分配贡献,我们制定了依赖于执行功率分配的渠道统计信息的最大最大公平性和总发射功率优化问题。每个优化问题的解决方案都是以低复杂性迭代设计的形式得出的,其中每个数据功率变量都取决于封闭形式的表达式。我们集成的混合网络概念允许为用户提供由于数据需求过多而无法容纳的用户。提出的算法允许我们解决至少一个用户以低于目标的速率提供的交通拥堵问题。还借助我们的数值结果来说明数学分析,该结果表明,考虑到改善千古数据吞吐量的空间链接的附加优势。此外,所提出的算法可以平稳地规避任何潜在的拥塞,尤其是面对高率要求和较弱的通道条件。

A whole suite of innovative technologies and architectures have emerged in response to the rapid growth of wireless traffic. This paper studies an integrated network design that boosts system capacity through cooperation between wireless access points (APs) and a satellite for enhancing the network's spectral efficiency. We first mathematically derive an achievable throughput expression for the uplink (UL) data transmission over spatially correlated Rician channels. Our generic achievable throughput expression is applicable for arbitrary received signal detection techniques under realistic imperfect channel estimates. A closed-form expression is then obtained for the ergodic UL data throughput when maximum ratio combining is utilized for detecting the desired signals. As for our resource allocation contributions, we formulate the max-min fairness and total transmit power optimization problems relying on the channel statistics for performing power allocation. The solution of each optimization problem is derived in form of a low-complexity iterative design, in which each data power variable is updated relying on a closed-form expression. Our integrated hybrid network concept allows users to be served that may not otherwise be accommodated due to the excessive data demands. The algorithms proposed to allow us to address the congestion issues appearing when at least one user is served at a rate below the target. The mathematical analysis is also illustrated with the aid of our numerical results that show the added benefits of considering the space links in terms of improving the ergodic data throughput. Furthermore, the proposed algorithms smoothly circumvent any potential congestion, especially in face of high rate requirements and weak channel conditions.

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