results: 论文透过实验和实际应用，证明了这些方法的有效性和抗变数能力。Abstract
Optimal algorithms are developed for robust detection of changes in non-stationary processes. These are processes in which the distribution of the data after change varies with time. The decision-maker does not have access to precise information on the post-change distribution. It is shown that if the post-change non-stationary family has a distribution that is least favorable in a well-defined sense, then the algorithms designed using the least favorable distributions are robust and optimal. Non-stationary processes are encountered in public health monitoring and space and military applications. The robust algorithms are applied to real and simulated data to show their effectiveness.
摘要
最佳算法被开发用于检测非站ARY进程中的变化。这些进程的数据分布 после变化随时间变化。决策者没有访问准确的后变化分布信息。研究表明，如果后变化非站ARY家族的分布是最不利的，那么基于最不利分布的算法是 Robust和优化的。非站ARY进程在公共卫生监测和空间和军事应用中出现。这些稳定算法应用于真实和 simulate数据，以示其效果。Note: "非站ARY" (pinyin: fēi zhàn yǐ) is a term used in statistics to refer to a non-stationary process.
HAPS in the Non-Terrestrial Network Nexus: Prospective Architectures and Performance Insights
paper_authors: Zhengying Lou, Baha Eddine Youcef Belmekki, Mohamed-Slim Alouini
for: This paper discusses the potential of High Altitude Platform Stations (HAPS) in Non-Terrestrial Networks (NTN) and their advantages and challenges.
methods: The paper presents various network architectures that incorporate HAPS, including ad-hoc, cell-free, and integrated access and backhaul. The authors also provide comprehensive performance insights when using HAPS in these architectures.
results: The paper shows that HAPS can interconnect the NTN nexus and provide versatility in terms of different metrics such as routing latency, energy efficiency, coverage probability, and channel capacity. Additionally, the paper highlights the performance gain provided by HAPS usage in NTN by comparing the results when no HAPS are used.Here is the simplified Chinese version of the three key points:
results: 论文显示了HAPS可以连接NTN的聚合点，并提供了不同约束下的多种维度性能探讨，如路由延迟、能效率、概率覆盖和频率容量。此外，论文还比较了无HAPS情况下的性能，进一步强调了HAPS在NTN中的性能提升。Abstract
High altitude platform stations (HAPS) have recently emerged as a new key stratospheric player in non-terrestrial networks (NTN) alongside satellites and low-altitude platforms. In this paper, we present the main communication links between HAPS and other NTN platforms, their advantages, and their challenges. Then, prospective network architectures in which HAPS plays an indispensable role in the future NTNs are presented such as ad-hoc, cell-free, and integrated access and backhaul. To showcase the importance of HAPS in the NTN, we provide comprehensive performance insights when using HAPS in the prospective architectures with the most suitable communication link. The insights show the HAPS' ability to interconnect the NTN nexus as well as their versatility by incorporating different metrics into the analysis such as routing latency, energy efficiency, coverage probability, and channel capacity. Depending on the architecture, HAPS will play different roles in NTN, such as a UAV network center, satellite relay, and ground network extension. Finally, the performance gain provided by HAPS usage in NTN is further highlighted by comparing the results when no HAPS are used.
摘要
高空平台站（HAPS）最近emerged as a new key stratospheric player in non-terrestrial networks（NTN） alongside satellites and low-altitude platforms. In this paper, we present the main communication links between HAPS and other NTN platforms, their advantages, and their challenges. Then, prospective network architectures in which HAPS plays an indispensable role in the future NTNs are presented such as ad-hoc, cell-free, and integrated access and backhaul. To showcase the importance of HAPS in the NTN, we provide comprehensive performance insights when using HAPS in the prospective architectures with the most suitable communication link. The insights show the HAPS' ability to interconnect the NTN nexus as well as their versatility by incorporating different metrics into the analysis such as routing latency, energy efficiency, coverage probability, and channel capacity. Depending on the architecture, HAPS will play different roles in NTN, such as a UAV network center, satellite relay, and ground network extension. Finally, the performance gain provided by HAPS usage in NTN is further highlighted by comparing the results when no HAPS are used.
On the Radio Stripe Deployment for Indoor RF Wireless Power Transfer
results: 对多个室内能量热点进行RF-WPT系统的优化 deployments，并提供了两种特定的shape configurations。结果表明，提posed radio stripe deployments可以超过中央完全数字方格阵列表现，而增加系统频率可能会降低其表现。Abstract
One of the primary goals of future wireless systems is to foster sustainability, for which, radio frequency (RF) wireless power transfer (WPT) is considered a key technology enabler. The key challenge of RF-WPT systems is the extremely low end-to-end efficiency, mainly due to the losses introduced by the wireless channel. Distributed antenna systems are undoubtedly appealing as they can significantly shorten the charging distances, thus, reducing channel losses. Interestingly, radio stripe systems provide a cost-efficient and scalable way to deploy a distributed multi-antenna system, and thus have received a lot of attention recently. Herein, we consider an RF-WPT system with a transmit radio stripe network to charge multiple indoor energy hotspots, i.e., spatial regions where the energy harvesting devices are expected to be located, including near-field locations. We formulate the optimal radio stripe deployment problem aimed to maximize the minimum power received by the users and explore two specific predefined shapes, namely the straight line and polygon-shaped configurations. Then, we provide efficient solutions relying on geometric programming to optimize the location of the radio stripe elements. The results demonstrate that the proposed radio stripe deployments outperform a central fully-digital square array with the same number of elements and utilizing larger radio stripe lengths can enhance the performance, while increasing the system frequency may degrade it.
摘要
一个Future无线系统的主要目标是培养可持续性，RF无线能量传输(WPT)被视为关键技术促进器。RF-WPT系统的主要挑战是终端到终端效率非常低，主要由无线通道引入的losses。分布天线系统在charging距离缩短了可以减少channel losses，因此受到了非常多的关注。 radio stripe系统提供了cost-efficient和可扩展的方式来部署分布多天线系统，因此在最近 Received a lot of attention.在这里，我们考虑了一个RF-WPT系统，使用发射天线网络来为多个indoor能量热点提供能量，包括近场位置。我们定义了最优的天线网络布置问题，以最大化用户接收到的能量水平。然后，我们提供了效率的解决方案，基于 геометрического编程来优化天线网络的位置。结果表明，我们的天线布置方案比中央完全数字方格阵列表现更好，而使用更长的天线长度可以提高性能，而增加系统频率可能会下降性能。
Robust Anti-jamming Communications with DMA-Based Reconfigurable Heterogeneous Array
results: 对比传统Homogeneous或Heterogeneous 天线阵列，提出了一种基于RHA和DMA的双步反干扰方案，能够提高干扰抗性能和Robustness。Abstract
In the future commercial and military communication systems, anti-jamming remains a critical issue. Existing homogeneous or heterogeneous arrays with a limited degrees of freedom (DoF) and high consumption are unable to meet the requirements of communication in rapidly changing and intense jamming environments. To address these challenges, we propose a reconfigurable heterogeneous array (RHA) architecture based on dynamic metasurface antenna (DMA), which will increase the DoF and further improve anti-jamming capabilities. We propose a two-step anti-jamming scheme based on RHA, where the multipaths are estimated by an atomic norm minimization (ANM) based scheme, and then the received signal-to-interference-plus-noise ratio (SINR) is maximized by jointly designing the phase shift of each DMA element and the weights of the array elements. To solve the challenging non-convex discrete fractional problem along with the estimation error in the direction of arrival (DoA) and channel state information (CSI), we propose a robust alternative algorithm based on the S-procedure to solve the lower-bound SINR maximization problem. Simulation results demonstrate that the proposed RHA architecture and corresponding schemes have superior performance in terms of jamming immunity and robustness.
摘要
将来的商业和军事通信系统中，抗干扰是一个关键问题。现有的同质或异质数组（DoF）有限和高消耗无法满足在快速变化和激烈干扰环境下的通信需求。为解决这些挑战，我们提出了可重新配置的异质数组（RHA）架构，基于动态表面天线（DMA），可以提高DoF并进一步提高抗干扰能力。我们提出了基于RHA的两步抗干扰方案，其中首先使用原子规范最小化（ANM）方法来估计multipath，然后使用共同设计DMA元素的相位和数组元素的加权来最大化接收信号干扰plus noise比率（SINR）。为解决非对称粗略分数问题以及DoA和CSI估计错误，我们提出了一种robust的S-过程算法来解决下界SINR最大化问题。实验结果表明，我们提出的RHA架构和相应的方案具有更高的抗干扰能力和稳定性。