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Deep Reinforcement Learning Assisted UAV Path Planning Relying on Cumulative Reward Mode and Region Segmentation 依赖累积奖励模式和区域分割的深度强化学习辅助无人机路径规划
IF 6.4 Q1 Engineering Pub Date : 2024-03-16 DOI: 10.1109/OJVT.2024.3402129
Zhipeng Wang;Soon Xin Ng;Mohammed EI-Hajjar
In recent years, unmanned aerial vehicles (UAVs) have been considered for many applications, such as disaster prevention and control, logistics and transportation, and wireless communication. Most UAVs need to be manually controlled using remote control, which can be challenging in many environments. Therefore, autonomous UAVs have attracted significant research interest, where most of the existing autonomous navigation algorithms suffer from long computation time and unsatisfactory performance. Hence, we propose a Deep Reinforcement Learning (DRL) UAV path planning algorithm based on cumulative reward and region segmentation. Our proposed region segmentation aims to reduce the probability of DRL agents falling into local optimal trap, while our proposed cumulative reward model takes into account the distance from the node to the destination and the density of obstacles near the node, which solves the problem of sparse training data faced by the DRL algorithms in the path planning task. The proposed region segmentation algorithm and cumulative reward model have been tested in different DRL techniques, where we show that the cumulative reward model can improve the training efficiency of deep neural networks by 30.8% and the region segmentation algorithm enables deep Q-network agent to avoid 99% of local optimal traps and assists deep deterministic policy gradient agent to avoid 92% of local optimal traps.
近年来,无人驾驶飞行器(UAV)已被考虑用于灾害预防和控制、物流和运输以及无线通信等许多应用领域。大多数无人飞行器需要使用遥控器进行手动控制,这在许多环境中都具有挑战性。因此,自主无人机引起了人们极大的研究兴趣,而大多数现有的自主导航算法都存在计算时间长、性能不理想等问题。因此,我们提出了一种基于累积奖励和区域分割的深度强化学习(DRL)无人机路径规划算法。我们提出的区域分割旨在降低DRL代理陷入局部最优陷阱的概率,而我们提出的累积奖励模型考虑了节点到目的地的距离和节点附近的障碍物密度,解决了DRL算法在路径规划任务中面临的训练数据稀疏的问题。我们在不同的 DRL 技术中测试了所提出的区域分割算法和累积奖励模型,结果表明累积奖励模型能将深度神经网络的训练效率提高 30.8%,区域分割算法能使深度 Q 网络代理避免 99% 的局部最优陷阱,并帮助深度确定性策略梯度代理避免 92% 的局部最优陷阱。
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引用次数: 0
Advancing UAV Communications: A Comprehensive Survey of Cutting-Edge Machine Learning Techniques 推进无人机通信:尖端机器学习技术综合概览
IF 5.3 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-03-15 DOI: 10.1109/OJVT.2024.3401024
Chenrui Sun;Gianluca Fontanesi;Berk Canberk;Amirhossein Mohajerzadeh;Symeon Chatzinotas;David Grace;Hamed Ahmadi
This paper provides a comprehensive overview of the evolution of Machine Learning (ML), from traditional to advanced, in its application and integration into unmanned aerial vehicle (UAV) communication frameworks and practical applications. The manuscript starts with an overview of the existing research on UAV communication and introduces the most traditional ML techniques. It then discusses UAVs as versatile actors in mobile networks, assuming different roles from airborne user equipment (UE) to base stations (BS). UAV have demonstrated considerable potential in addressing the evolving challenges of next-generation mobile networks, such as enhancing coverage and facilitating temporary hotspots but pose new hurdles including optimal positioning, trajectory optimization, and energy efficiency. We therefore conduct a comprehensive review of advanced ML strategies, ranging from federated learning, transfer and meta-learning to explainable AI, to address those challenges. Finally, the use of state-of-the-art ML algorithms in these capabilities is explored and their potential extension to cloud and/or edge computing based network architectures is highlighted.
本文全面概述了机器学习(ML)从传统到先进的演变过程,及其在无人机(UAV)通信框架和实际应用中的应用和集成。文稿首先概述了无人机通信方面的现有研究,并介绍了最传统的 ML 技术。然后讨论了无人机作为移动网络中的多面手,承担着从机载用户设备(UE)到基站(BS)的不同角色。无人机在应对下一代移动网络不断发展的挑战(如增强覆盖范围和促进临时热点)方面表现出了相当大的潜力,但也带来了新的障碍,包括优化定位、轨迹优化和能效。因此,我们全面回顾了先进的人工智能策略,从联合学习、迁移学习和元学习到可解释人工智能,以应对这些挑战。最后,我们探讨了最先进的人工智能算法在这些能力中的应用,并强调了这些算法扩展到基于云计算和/或边缘计算的网络架构的潜力。
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引用次数: 0
Cascaded and Sum of Cascaded Over $boldsymbol{alpha }$–$boldsymbol{mathcal {F}}$ Fading Channels With Pointing Error Impairment 有指向性误差损伤的级联和级联之和超过 $boldsymbol{alpha }$-$boldsymbol{mathcal {F}}$ Fading 信道
IF 6.4 Q1 Engineering Pub Date : 2024-03-14 DOI: 10.1109/OJVT.2024.3400901
Pedro H. D. Almeida;Hugerles S. Silva;Ugo S. Dias;Rausley A. A. de Souza;Iguatemi E. Fonseca;Yonghui Li
In this article, exact expressions are presented for the probability density function, cumulative distribution function, moment generating function, and higher-order moments of the instantaneous signal-to-noise ratio, considering the product and the sum of the products of $N$ $alpha$-$mathcal {F}$ variates with pointing errors. New expressions for the outage probability (OP), bit error probability (BEP), ergodic channel capacity, and the area under the receiver operating characteristics (AUC) are deduced, as well as the asymptotic ones. The obtained expressions are used to assess the influence of various channels and system parameters on the system performance. We analyze a scenario considering dual-hop terahertz links and another regarding reconfigurable intelligent surfaces (RIS)-assisted systems. All expressions derived in this work are new, and Monte Carlo simulations corroborate the analytical curves shown.
本文提出了瞬时信噪比的概率密度函数、累积分布函数、矩产生函数和高阶矩的精确表达式,考虑了具有指向误差的 $N$ $alpha$-$mathcal {F}$ 变量的乘积和乘积之和。推导出了中断概率 (OP)、误码概率 (BEP)、遍历信道容量和接收器工作特性下面积 (AUC) 的新表达式以及渐近表达式。得到的表达式用于评估各种信道和系统参数对系统性能的影响。我们分析了双跳太赫兹链路和可重构智能表面(RIS)辅助系统的情况。这项工作中得出的所有表达式都是新的,蒙特卡罗模拟证实了所显示的分析曲线。
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引用次数: 0
Design and Control of Hybrid Electric Light Rail Vehicles With Open Ended Winding Machines 带开口绕线机的混合动力轻轨电动车辆的设计与控制
IF 6.4 Q1 Engineering Pub Date : 2024-03-13 DOI: 10.1109/OJVT.2024.3400607
Davide De Simone;Maria Stefania Carmeli;Salvatore D'Arco;Luigi Piegari;Pietro Tricoli
Light railways are a low carbon emission form of transport, but it is often difficult to electrify tracks in central urban areas. This limitation can be avoided by integrating an on-board battery storage connected to the dc bus of the traction inverter with a boost dc/dc converter. However, the boost converter requires a bulky inductor and introduces additional power losses that are undesirable. This paper proposes to replace the standard induction motor with an open ended winding induction motor connected at one end to the overhead line with the traction inverter and to the other end to a battery with a second inverter in order to reduce the power losses of the traction drive. The paper addresses design and control aspects for light rail vehicles with open ended winding induction machines when the power supply is partly from the overhead line and partly from the on board battery. Moreover, the paper studies in detail the hybrid operations of the traction system i.e., when the overhead line charges the battery during coasting or at the stops. Finally, numerical simulations for a real use case are presented to quantify the reduction of power losses in comparison to the standard solution.
轻轨是一种低碳排放的交通方式,但在中心城区通常很难实现轨道电气化。将车载蓄电池与牵引逆变器的直流母线相连,再加上一个升压直流/直流转换器,就可以避免这一限制。然而,升压转换器需要一个笨重的电感器,并且会带来额外的功率损耗,这是不可取的。本文建议用开口绕组感应电机取代标准感应电机,开口绕组感应电机的一端通过牵引变频器与架空线路相连,另一端通过第二个变频器与蓄电池相连,以减少牵引驱动装置的功率损耗。本文论述了在部分电源来自架空线路、部分电源来自车载电池的情况下,采用开口绕组感应电机的轻轨车辆的设计和控制问题。此外,论文还详细研究了牵引系统的混合运行,即在滑行或停车时由架空线路为电池充电。最后,本文介绍了一个实际应用案例的数值模拟,以量化与标准解决方案相比所减少的功率损耗。
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引用次数: 0
Sustainable Mobility in B5G/6G: V2X Technology Trends and Use Cases B5G/6G 中的可持续移动性:V2X 技术趋势和使用案例
IF 6.4 Q1 Engineering Pub Date : 2024-03-11 DOI: 10.1109/OJVT.2024.3375451
Sandra Roger;Carmen Botella-Mascarell;David Martín-Sacristán;David García-Roger;Jose F. Monserrat;Tommy Svensson
The concept of sustainability has been recently extended to cover economic and social factors besides the traditional environmental ones. This paper reflects on the potential of mobile communication standards towards achieving sustainable mobility, with focus on vehicular communications and use cases in smart cities scenarios. In this context, intelligent transportation systems, including connected and autonomous vehicles, will be key for developing affordable and sustainable infrastructures and services. We start by identifying three current technology trends, namely, towards climate neutral; cloudification and edge computing; and Big Data and artificial intelligence, and then we examine their capability to enable sustainable Vehicle-to-Everything (V2X) communication systems in beyond 5G and 6G networks. In the second part of the paper, a set of selected use case categories involving connected and autonomous vehicles is presented, showcasing the potential impact of the selected technology trends. Finally, a review of the estimates of the quantitative savings that could be achieved in environmental-related parameters such as energy/fuel consumption and greenhouse gas emissions is provided.
除了传统的环境因素外,可持续发展的概念最近还扩展到经济和社会因素。本文探讨了移动通信标准在实现可持续交通方面的潜力,重点是智能城市场景中的车辆通信和使用案例。在此背景下,智能交通系统(包括联网和自动驾驶车辆)将成为开发经济、可持续基础设施和服务的关键。我们首先确定了当前的三个技术趋势,即气候中和、云化和边缘计算以及大数据和人工智能,然后研究了它们在超越 5G 和 6G 网络中实现可持续车对物 (V2X) 通信系统的能力。本文的第二部分介绍了一组涉及联网和自动驾驶车辆的选定用例类别,展示了选定技术趋势的潜在影响。最后,本文回顾了在能源/燃料消耗和温室气体排放等环境相关参数方面可实现的量化节约估算。
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引用次数: 0
ZSM-Based E2E Security Slice Management for DDoS Attack Protection in MEC-Enabled V2X Environments 基于 ZSM 的 E2E 安全片管理,在支持 MEC 的 V2X 环境中保护 DDoS 攻击
IF 6.4 Q1 Engineering Pub Date : 2024-03-11 DOI: 10.1109/OJVT.2024.3375448
Rodrigo Asensio-Garriga;Pol Alemany;Alejandro M. Zarca;Roshan Sedar;Charalampos Kalalas;Jordi Ortiz;Ricard Vilalta;Raul Muñoz;Antonio Skarmeta
Research on vehicle-to-everything (V2X) is attracting significant attention nowadays, driven by the recent advances in beyond-5G (B5G) networks and the multi-access edge computing (MEC) paradigm. However, the inherent heterogeneity of B5G combined with the security vulnerabilities of MEC infrastructure in dynamic V2X scenarios introduces unprecedented challenges. Efficient resource and security management in multi-domain V2X environments is vital, especially with the growing threat of distributed denial-of-service (DDoS) attacks against critical V2X services within MEC. Our approach employs the zero-touch network and service management (ZSM) standard, integrating autonomous security into end-to-end (E2E) slicing management. We consider an entire 5G network, including vehicular user equipment, radio access networks, MEC, and core components, in the presence of DDoS targeting V2X services. Our framework complies with security service-level agreements (SSLAs) and policies, autonomously deploying and interconnecting security sub-slices across domains. Security requirements are continuously monitored and, upon DDoS detection, our framework reacts with a coordinated E2E strategy. The strategy mitigates DDoS at the MEC and deploys countermeasures in neighboring domains. Performance assessment reveals effective DDoS detection and mitigation with low latency, aligned with the mission-critical nature of certain V2X services. This work is part of ETSI ZSM PoC “security SLA assurance in 5G network slices”.
如今,在 5G 以外(B5G)网络和多接入边缘计算(MEC)范例的最新进展的推动下,有关车对物(V2X)的研究备受关注。然而,B5G 固有的异构性与动态 V2X 场景中 MEC 基础设施的安全漏洞相结合,带来了前所未有的挑战。多域 V2X 环境中的高效资源和安全管理至关重要,尤其是在 MEC 中的关键 V2X 服务受到分布式拒绝服务 (DDoS) 攻击的威胁日益严重的情况下。我们的方法采用了零接触网络和服务管理(ZSM)标准,将自主安全集成到端到端(E2E)切片管理中。我们考虑了整个 5G 网络,包括车辆用户设备、无线接入网络、MEC 和核心组件,以及针对 V2X 服务的 DDoS。我们的框架符合安全服务级别协议(SSLA)和策略,可跨域自主部署和互联安全子切片。我们会持续监控安全要求,一旦检测到 DDoS,我们的框架就会通过协调的 E2E 策略做出反应。该策略可减轻 MEC 的 DDoS,并在邻域部署应对措施。性能评估显示,DDoS 检测和缓解效果显著,延迟时间短,符合某些 V2X 服务的关键任务性质。这项工作是 ETSI ZSM PoC "5G 网络切片中的安全 SLA 保证 "的一部分。
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引用次数: 0
A Three-Stage-Concatenated Non-Linear MMSE Interference Rejection Combining Aided MIMO-OFDM Receiver and its EXIT-Chart Analysis 一种三阶段耦合非线性 MMSE 干扰抑制组合辅助 MIMO-OFDM 接收器及其 EXIT 图表分析
IF 6.4 Q1 Engineering Pub Date : 2024-03-11 DOI: 10.1109/OJVT.2024.3375217
Jue Chen;Siyao Lu;Tsang-Yi Wang;Jwo-Yuh Wu;Chih-Peng Li;Soon Xin Ng;Robert G. Maunder;Lajos Hanzo
The demodulation reference signal of the 5G Multiple-Input Multiple-Output Orthogonal Frequency-Division Multiplexing (MIMO-OFDM) waveform has been designed for supporting Minimum Mean-Square Error-Interference Rejection Combining (MMSE-IRC) equalization, which has become the state-of-the-art, owing to its enhanced performance in the case of dense frequency reuse, which is typical in 5G. By contrast, in the 4G LTE system, typically turbo equalization techniques were used. The family of Non-Linear receiver techniques tend to be eminently suitable for tough rank-deficient scenarios, when the received signal constellation becomes linearly non-separable. Hence, we propose a novel receiver for interference-constrained MIMO-OFDM systems, relying on a linear MMSE-IRC detector intrinsically amalgamated with an additional NL equalizer. In this way, we may achieve the best of both worlds, retaining the interference rejection capability of the MMSE-IRC detector and the superior performance of the NL equalizer. Our solution circumvents the potential failure of the MMSE-IRC, when the MIMO channels' degree freedom is completely exhausted by the desired users in case the transmitter has a high number of transmission layers for example. Based on this concept, we then design a novel NL equalizer relying on the Smart Ordering and Candidate Adding (SOCA) algorithm. This reduced complexity NL detection algorithm is particularly well suited for practical hardware implementation using parallel processing at a low latency. Briefly, the proposed scheme employs the MMSE-IRC detector for mitigating the interference. It makes the first estimate of the desired user signals and then uses the SOCA detector for further decontaminating the received signals. It also generates the soft information, enabling turbo equalization, wherein iterative detector and decoder iteratively exchange their soft information. We present BLock Error Rate (BLER) results, which show that the proposed scheme can always achieve superior performance to the conventional MMSE-IRC detector at the cost of increasing the complexity. In some cases, our proposed scheme can obtain about 1.5 dB gain, at the cost of 4 times higher complexity. We demonstrate that the complexity of the SOCA detector can be reduced by adjusting its parameterization or at the cost of reducing the self-consistency of the soft information produced by the SOCA detector, which slightly erodes the BLER performance. In order to mitigate this, we propose to use Deep Learning (DL) for enhancing the accuracy of the soft information. Using this technique, we show that the MMSE-IRC-NL-SOCA detector relying on DL attains about 3 dB gain at the cost of only marginally increasing the complexity, compared to the proposed MMSE-IRC-NL-SOCA scheme.
5G 多入多出正交频分复用(MIMO-OFDM)波形的解调参考信号是为支持最小均方误差干扰抑制组合(MMSE-IRC)均衡而设计的,由于其在 5G 典型的密集频率重用情况下性能更强,MMSE-IRC 均衡已成为最先进的技术。相比之下,4G LTE 系统通常使用涡轮均衡技术。当接收到的信号星座变得线性不可分时,非线性接收器技术系列往往非常适合于艰难的秩缺陷场景。因此,我们为干扰受限的 MIMO-OFDM 系统提出了一种新型接收器,它依赖于线性 MMSE-IRC 检测器与附加的非线性均衡器的内在结合。这样,我们就可以实现两全其美,既保留 MMSE-IRC 检测器的干扰抑制能力,又保留 NL 均衡器的卓越性能。我们的解决方案规避了 MMSE-IRC 的潜在失效问题,当 MIMO 信道的自由度被所需用户完全耗尽时,例如发射机有大量传输层的情况。基于这一概念,我们设计了一种新型 NL 均衡器,它依赖于智能排序和候选添加(SOCA)算法。这种复杂度较低的 NL 检测算法特别适合使用并行处理技术在低延迟条件下进行实际硬件实施。简而言之,拟议方案采用 MMSE-IRC 检测器来减轻干扰。它首先估计所需的用户信号,然后使用 SOCA 检测器进一步净化接收到的信号。它还能生成软信息,实现涡轮均衡,其中迭代检测器和解码器迭代交换其软信息。我们展示了 BLock Error Rate (BLER) 结果,结果表明所提出的方案总是能以增加复杂度为代价,实现优于传统 MMSE-IRC 检测器的性能。在某些情况下,我们提出的方案可以获得约 1.5 dB 的增益,但代价是复杂度增加了 4 倍。我们证明,可以通过调整 SOCA 检测器的参数化来降低其复杂性,但代价是降低 SOCA 检测器产生的软信息的自洽性,从而略微降低 BLER 性能。为了缓解这一问题,我们建议使用深度学习(DL)来提高软信息的准确性。通过使用这一技术,我们表明,与所提出的 MMSE-IRC-NL-SOCA 方案相比,依赖于 DL 的 MMSE-IRC-NL-SOCA 检测器可以获得约 3 dB 的增益,而代价只是稍微增加了复杂性。
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引用次数: 0
Realistic Channel and Delay Coefficient Generation for Dual Mobile Space-Ground Links: A Tutorial 双移动空地链路的真实信道和延迟系数生成--教程
IF 6.4 Q1 Engineering Pub Date : 2024-03-09 DOI: 10.1109/OJVT.2024.3399072
Hongzhao Zheng;Mohamed Atia;Halim Yanikomeroglu
Channel and delay coefficient are two essential parameters for the characterization of a multipath propagation environment. It is crucial to generate realistic channel and delay coefficient in order to study the channel characteristics that involves signals propagating through environments with severe multipath effects. While many deterministic channel models, such as ray-tracing (RT), face challenges like high computational complexity, data requirements for geometrical information, and inapplicability for space-ground links, and nongeometry-based stochastic channel models (NGSCMs) might lack spatial consistency and offer lower accuracy, we present a scalable tutorial for the channel modeling of dual mobile space-ground links in urban areas, utilizing the Quasi Deterministic Radio Channel Generator (QuaDRiGa), which adopts a geometry-based stochastic channel model (GSCM), in conjunction with an International Telecommunication Union (ITU) provided state duration model. This tutorial allows for the generation of realistic channel and delay coefficients in a multipath environment for dual mobile space-ground links. We validate the accuracy of the work by analyzing the generated channel and delay coefficient from several aspects, such as received signal power and amplitude, multipath delay distribution, delay spread and Doppler spectrum.
信道和延迟系数是描述多径传播环境的两个基本参数。为了研究信号在具有严重多径效应的环境中传播时的信道特性,生成真实的信道和延迟系数至关重要。许多确定性信道模型,如射线追踪(RT),面临着计算复杂度高、几何信息数据要求高、不适用于空地链路等挑战,而基于非几何的随机信道模型(NGSCM)可能缺乏空间一致性,精度较低、我们将利用准确定性无线电信道发生器(QuaDRiGa),结合国际电信联盟(ITU)提供的状态持续时间模型,为城市地区双移动空地链路的信道建模提供一个可扩展的教程。该教程可在多径环境中为双移动空地链路生成真实的信道和延迟系数。我们从接收信号功率和振幅、多径延迟分布、延迟扩散和多普勒频谱等几个方面分析了生成的信道和延迟系数,从而验证了这项工作的准确性。
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引用次数: 0
Inter-User Interference Cancellation Scheme for 5G-Based Dynamic Full-Duplex Cellular System 基于 5G 的动态全双工蜂窝系统的用户间干扰消除方案
IF 6.4 Q1 Engineering Pub Date : 2024-03-08 DOI: 10.1109/OJVT.2024.3398566
Shota Mori;Keiichi Mizutani;Hiroshi Harada
Improving spectral efficiency is an important issue for the next generation of the 5th generation mobile communication (5G) systems. Full-duplex cellular (FDC) and dynamic-FDC (DDC) systems based on the 5G signal format (5G-FDC and 5G-DDC) have gained substantial attention for introducing in-band full-duplex (IBFD) into 5G. However, self-interference (SI) at a base station (BS) and inter-user interference (IUI) in user equipment (UE) are significant hurdles in implementing FDC and DDC systems. This study proposes an IUI cancellation (IUIC) scheme based on successive interference cancellation tailored to the signal configuration and channel coding of 5G. Additionally, we introduce user scheduling and adaptive modulation algorithms for 5G-DDC. We evaluate the proposed schemes using link- and system-level simulations. The results demonstrate a remarkable 40 dB reduction in IUI with a 3.4 dB decline in reception quality. Furthermore, our IUIC method reduces the IUI of close-distance UE pairs, expands the candidate UE pairs for IBFD operation, and significantly enhances the IBFD application ratio in the downlink slot by 51.0% compared to conventional 5G-DDC. Moreover, the gain of the uplink average throughput increases by 11.4% when the BS and UE transmission powers are at their maximum.
提高频谱效率是下一代第五代移动通信(5G)系统的一个重要问题。基于 5G 信号格式的全双工蜂窝(FDC)和动态全双工(DDC)系统(5G-FDC 和 5G-DDC)因将带内全双工(IBFD)引入 5G 而备受关注。然而,基站(BS)的自干扰(SI)和用户设备(UE)的用户间干扰(IUI)是实现 FDC 和 DDC 系统的重大障碍。本研究针对 5G 的信号配置和信道编码,提出了一种基于连续干扰消除的 IUI 消除(IUIC)方案。此外,我们还为 5G-DDC 引入了用户调度和自适应调制算法。我们利用链路和系统级仿真对所提出的方案进行了评估。结果表明,在接收质量下降 3.4 dB 的情况下,IUI 明显降低了 40 dB。此外,与传统 5G-DDC 相比,我们的 IUIC 方法降低了近距离 UE 对的 IUI,扩大了 IBFD 操作的候选 UE 对,并将下行链路时隙中的 IBFD 应用率显著提高了 51.0%。此外,当 BS 和 UE 发射功率达到最大值时,上行链路平均吞吐量增益增加了 11.4%。
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引用次数: 0
On the Performance of Interference-Based Energy-Harvesting-Enabled Wireless AF Relaying Communication Systems 论基于干扰的能量收集无线 AF 中继通信系统的性能
IF 6.4 Q1 Engineering Pub Date : 2024-03-05 DOI: 10.1109/OJVT.2024.3373721
Yazid M. Khattabi;Yazan H. Al-Badarneh;Mohamed-Slim Alouini
This article considers an interference-based radio-frequency energy harvesting (RF-EH)-empowered wireless dual-hop amplify-and-forward relaying system in which an ambient interferer is beneficially utilized as the solely free power source for EH and detrimentally considered as the dominant factor that corrupts its receivers. Three EH modes are considered and analyzed separately. In mode I, energy is harvested only by the source; in mode II, energy is harvested only by the relay; and in mode III, energy is harvested concurrently by both the source and relay. Under these modes, exact and approximate analytical expressions are derived for the system's outage probability, which are directly used to determine the system's delay-limited throughput as a performance figure of merit. Thorough numerical and simulation results are presented to verify the analytical work and to demonstrate the system's throughput performance under different system and channel parameters. For example, results reveal that for given channel conditions, increasing the interferer's power reduces the throughput in case of modes I and II, and has no effect on it in case of mode III. Also, for given interferer's power, improving the channel conditions between the interferer and a harvesting node, improves the throughput, while improving them between the interferer and a receiving node, degrades the throughput.
本文探讨了一种基于干扰的射频能量收集(RF-EH)供电无线双跳放大和前向中继系统,在该系统中,环境干扰器被用作 EH 的唯一免费电源,并被视为干扰其接收器的不利因素。本文考虑并分别分析了三种 EH 模式。在模式 I 中,能量仅由信号源采集;在模式 II 中,能量仅由中继器采集;在模式 III 中,能量由信号源和中继器同时采集。在这些模式下,得出了系统中断概率的精确和近似分析表达式,这些表达式可直接用于确定系统的延迟限制吞吐量,作为性能参数。为了验证分析结果,并证明系统在不同系统和信道参数下的吞吐量性能,我们给出了详尽的数值和仿真结果。例如,结果显示,在给定信道条件下,增加干扰功率会降低模式 I 和模式 II 的吞吐量,而对模式 III 则没有影响。此外,在给定干扰功率的情况下,改善干扰器与收获节点之间的信道条件可提高吞吐量,而改善干扰器与接收节点之间的信道条件则会降低吞吐量。
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IEEE Open Journal of Vehicular Technology
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