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2019 IEEE 30th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC Workshops)最新文献

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Performance Analysis of Pilot Patterns for Channel Estimation for OFDM Systems in High-Speed Trains Scenarios 高速列车场景下OFDM系统信道估计导频模式性能分析
Erislandy Mozo, Arrate Alonso Gómez, Francisco Parrilla, M. Mendicute
In the last decade, different wireless technologies have been deployed in the railway infrastructure to support critical and non-critical services. Due to the tangible benefits that they have provided to both rail operators and users, different communication technologies are currently being designed or adapted to be deployed in this environment. In this sense, this paper proposes to adapt the IEEE802.11p protocol to be used in these environments, characterized by high speeds. It presents a comb-type pilot based channel estimation scheme adapted to the IEEE802.11p frame. In this proposal, the number of pilot carriers is increased (from four to six or eight) and distributed almost uniformly, without increasing the nominal bandwidth of the signal. In addition, different interpolation techniques are used to obtain the channel response for each OFDM transmitted symbol. The performance improvement is quantified through the effective bit rate and the BER (Bit Error Rate) in relation to the standard. The results show that the proposed estimation method has better performance than the standard estimation method for Doppler frequencies above 400 Hz (77 km/h). This enhancement is translated into a throughput gain in comparison to the standard, e.g 2.1 Mbps throughput gain for 600 Hz Doppler shift. Besides, its performance curves are more stable (lower fluctuation) at the increase of the Doppler shift.
在过去十年中,不同的无线技术已经部署在铁路基础设施中,以支持关键和非关键服务。由于它们为铁路运营商和用户提供了切实的好处,目前正在设计或调整不同的通信技术,以便在这种环境中部署。从这个意义上说,本文提出对IEEE802.11p协议进行调整,以适应这些以高速为特点的环境。提出了一种适用于IEEE802.11p帧的基于梳式导频的信道估计方案。在这个方案中,增加了导频载波的数量(从4个增加到6个或8个),并且几乎均匀地分布,而不增加信号的标称带宽。此外,还采用了不同的插值技术来获得每个OFDM传输符号的信道响应。性能改进通过有效比特率和误码率(BER)来量化。结果表明,对于400 Hz (77 km/h)以上的多普勒频率,该估计方法比标准估计方法具有更好的性能。与标准相比,这种增强转化为吞吐量增益,例如,600 Hz多普勒频移的吞吐量增益为2.1 Mbps。此外,随着多普勒频移的增加,其性能曲线更加稳定(波动更小)。
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引用次数: 1
Fine-Grained Task Offloading for UAV via MEC-Enabled Networks 基于mec网络的无人机细粒度任务卸载
Shuyang Huang, Linpei Li, Qi Pan, Wei Zheng, Zhaoming Lu
The ground mobile edge computing (MEC) system has been effectively utilized to undertake the computation-intensive tasks offloaded from unmanned aerial vehicles (UAVs), which has significantly mitigated the aerial calculation pressure. However, some external factors, like environmental conditions and the distribution of MEC servers can deeply affect the performance of offloading algorithms. In this paper, an enhanced offloading algorithm is proposed to minimize the the completion time. For the sake of practice, the air-to-ground (A2G) channel model is rebuilt with the line of sight (LoS)/non-line of sight (NLoS) status considered. Furthermore, the boundary of effective offloading area with dense MEC servers is denoted by the round margin raised. Within the round margin, UAV offloads its calculation to the ground and plans its trajectory simultaneously. Outside the round margin, UAV flies along the straight path with maximum speed, which avoids inefficient operations within the sparse and deviated area. Simulation results show that the proposed scheme is validated with better performance. Moreover, the differences of offloading effectiveness under different conditions of sparsity or deviation provide potential instructions for future trade-off research between offloading and local computing.
地面移动边缘计算(MEC)系统有效地承担了无人机卸载的计算密集型任务,显著减轻了空中计算压力。然而,一些外部因素,如环境条件和MEC服务器的分布,会严重影响卸载算法的性能。本文提出了一种增强的卸载算法,使完成时间最小化。为了便于实践,在考虑瞄准线(LoS)/非瞄准线(NLoS)状态的情况下,对空对地(A2G)信道模型进行了重建。在此基础上,将MEC服务器密集区的有效卸载区域边界用凸起的圆边表示。在圆距范围内,无人机将其计算卸载到地面并同时规划其轨迹。在圆边界外,无人机以最大速度沿直线飞行,避免了在稀疏和偏离区域内的低效操作。仿真结果表明,该方案具有较好的性能。此外,在不同稀疏度或偏差条件下,卸载效率的差异为未来卸载与局部计算之间的权衡研究提供了潜在的指导。
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引用次数: 5
An Overview on Security and Privacy Challenges and Their Solutions in Fog-Based Vehicular Application 基于雾的车辆应用中安全与隐私挑战及其解决方案综述
Z. Bakhshi, A. Balador
Fog computing is an emerging computing paradigm that extends cloud services to the edge of the network by moving computation tasks from cloud to network edges to reduce response latency in a wireless network. Fog computing inherits the principle of peer-to-peer networking, decentralization, and geographical distribution from clouds. Hence, fog computing becomes an ideal platform for readily supporting vehicular applications due to its dynamic support for mobility of client-devices and low latent heterogeneous communication capabilities. Despite many advantages, a multitude of security and privacy issues affects the platforms and renders it as a target for unknown adversaries. This has significant implication in the development of safety critical applications, such as vehicular cloud and intelligent transportation system. This paper presents, an overview of existing security and privacy vulnerabilities in fog computing, particularly in vehicular networks. Moreover, state-of-the-art security and privacy solutions for fog based vehicular networks are analyzed. In conclusion, open challenges and future research directions are discussed.
雾计算是一种新兴的计算范式,它通过将计算任务从云移到网络边缘来减少无线网络中的响应延迟,从而将云服务扩展到网络边缘。雾计算继承了云的点对点网络、去中心化和地理分布原则。因此,雾计算因其对客户端设备移动性的动态支持和低潜在异构通信能力而成为易于支持车载应用程序的理想平台。尽管有许多优点,但大量的安全和隐私问题影响了平台,并使其成为未知对手的目标。这对车辆云和智能交通系统等安全关键应用的发展具有重要意义。本文概述了雾计算中存在的安全和隐私漏洞,特别是在车载网络中。此外,还分析了基于雾的车辆网络的最先进的安全和隐私解决方案。最后,对未来的研究方向和面临的挑战进行了展望。
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引用次数: 6
Joint 3D Codebook Design and Beam Training for UAV Millimeter-Wave Communications 无人机毫米波通信联合三维码本设计与波束训练
Yangyang Wang, X. Wen, Yawen Chen, Wenpeng Jing, Qi Pan
Owing to its excellent flexibility, unmanned aerial vehicles (UAV) have been widely adopted as aerial access points to provide data collection services for the Internet of Things (IoT) devices. Moreover, Millimeter-Wave (MmWave) aided UAV communications to achieve extremely high data rate has also become the hot issue in recent research. Codebook designing and beam training are the enabling technologies of MmWave communications. However, the existing solutions for communication systems cannot be directly applied in the UAV Mmwave communications, because of the increased complexity in moving and 3D UAV scenarios. Therefore, this paper focuses on joint codebook design and beam training. Firstly, a 3D codebook is designed which can provide flexible access for IoT devices and achieve the optimal system throughput. Then, based on the designed codebook, a Angle Forecast based Fast Beam Alignment (AFFBA) mechanism is proposed. This mechanism infers the potential angle range of ideal AoD from the beam adopted by the current serving UAV. Combing the angle range and the trajectory model of UAV, the optimal beam is forecasted. The proposed joint 3D codebook design and beam training significantly reduce the dimension of beam sweeping space. Simulation results demonstrate the superior performance of the proposed mechanism, and show that the proposed mechanism significantly reduce the beam sweeping space and effectively improve the normalized spectral efficiency (NSE) compared to existing exhaustive training mechanism.
无人机(UAV)由于其优异的灵活性,已被广泛采用作为空中接入点,为物联网(IoT)设备提供数据采集服务。此外,毫米波(MmWave)辅助无人机通信实现极高的数据速率也成为近年来的研究热点。码本设计和波束训练是毫米波通信的使能技术。然而,由于移动和3D无人机场景的复杂性增加,现有的通信系统解决方案不能直接应用于无人机毫米波通信。因此,本文重点研究了联合码本设计和梁训练。首先,设计了一个3D码本,为物联网设备提供灵活的访问并实现最佳的系统吞吐量。然后,基于设计的码本,提出了一种基于角度预测的快速波束对准(AFFBA)机制。该机制根据现役无人机采用的波束推断出理想AoD的潜在角度范围。结合无人机的角度范围和轨迹模型,预测了最优波束。所提出的联合三维码本设计和波束训练显著降低了波束扫描空间的尺寸。仿真结果表明,与现有的穷穷训练机制相比,该机制显著减小了波束扫描空间,有效提高了归一化频谱效率(NSE)。
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引用次数: 6
Full Duplex for Next Generation of 802.11 下一代802.11的全双工
Ming Gan, Yuchen Guo, G. Tsodik, Yan Xin, Xun Yang, E. Au, O. Aboul-Magd
Next generation of 802.11 Wireless Local Network (WLAN) demands higher throughput and lower latency. Full duplex (FD) technology is a promising solution to meet those requirements. This paper presents FD-based data transmission protocol for WLAN applications. Collision detection is considered to allow FD-capable STAs to listen to the media while transmitting, thus parallel transmissions can be potentially recognized in order to improve system efficiency. System level simulation results are provided to evaluate system throughput, latency and collision rates of FD-based WLAN.
下一代802.11无线局域网(WLAN)要求更高的吞吐量和更低的延迟。全双工(FD)技术是满足这些要求的一个很有前途的解决方案。提出了一种基于fd的无线局域网数据传输协议。碰撞检测被认为允许具有fd功能的sta在传输时收听媒体,因此可以潜在地识别并行传输,以提高系统效率。给出了系统级仿真结果,以评估基于fd的WLAN的系统吞吐量、延迟和碰撞率。
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引用次数: 4
Ray-based Deterministic Channel Modelling for sub-THz Band 亚太赫兹波段基于射线的确定性信道建模
G. Gougeon, Y. Corre, Mohammed Zahid Aslam
Future wireless communications systems will require large network capacities beyond the capabilities of present and upcoming 5G technology. The trend of considering higher frequencies for their large bandwidths continues today into the sub-THz domain. The BRAVE project considers the frequencies in the 90–200 GHz spectrum, which have been considered in this paper. The challenges of channel modelling at sub-THz frequencies are described along with extensions made to a ray-based deterministic tool. The geographical and physical accuracies inherent to the ray-based tool are exploited to simulate two different scenarios. The first scenario is an indoor office scenario and the second is an outdoor in-street scenario. The application of the updated channel modelling properties of the ray-based tool provides interesting perspectives into the sub-THz channel modelling. This permits the development of realistic models for the evaluation, characterization and eventual deployment of such systems.
未来的无线通信系统将需要比当前和即将到来的5G技术能力更大的网络容量。为大带宽考虑更高频率的趋势今天继续进入次太赫兹域。BRAVE项目考虑的是90-200 GHz频谱范围内的频率,本文已经考虑了这些频率。描述了在次太赫兹频率下通道建模的挑战以及对基于射线的确定性工具的扩展。利用基于射线的工具固有的地理和物理精度来模拟两种不同的情况。第一个场景是室内办公室场景,第二个场景是室外街道场景。基于光线的工具的更新通道建模属性的应用为亚太赫兹通道建模提供了有趣的视角。这允许为评估、描述和最终部署这种系统开发现实的模型。
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引用次数: 26
Parametric Guess and Determine Attack on Stream Ciphers 流密码的参数猜测与确定攻击
Orhun Kara, Ebru Küçükkubas
Due to the rapid evolution and usage of IoT devices in the world, the need for lightweight cryptography for resource-constrained devices gained a great importance. Although it has been common in the cryptology community that stream ciphers are supposed to be more efficient in speed and area than block ciphers, it has been seen in the last 10–15 years that most of ciphers designed for resource-constrained devices to take up less area and less energy on hardware-based platforms, such as ASIC or FPGA, are lightweight block ciphers. On the other hand, the design and analysis of stream ciphers using keyed internal update function is put forward against this belief and it has become one of the popular study subjects in the literature in the last few years. Plantlet, proposed in 2017, and its predecessor Sprout, proposed in 2015, are famous algorithms as examples of stream ciphers using keyed internal update function. Sprout was broken after a short time by many researchers but Plantlet hasn't been succesfully broken yet. Traditionally, key stream generators of stream ciphers update their internal states only by using their current internal state. Since the use of the key in the internal update is a new approach, the security analysis of this approach is not fully understood. In this study, the security analysis of the key stream generators with keyed update function has been studied. A new attack algorithm for internal state recovery and key recovery has been developed and mounted on Plantlet algorithm as an instance of stream ciphers with keyed update function.
由于世界上物联网设备的快速发展和使用,对资源受限设备的轻量级加密的需求变得非常重要。虽然在密码学社区中,流密码被认为在速度和面积上比分组密码更有效是很常见的,但在过去的10-15年里,大多数为资源受限设备设计的密码在基于硬件的平台(如ASIC或FPGA)上占用的面积和能量更少,是轻量级的分组密码。另一方面,基于键控内部更新功能的流密码设计和分析正是基于这一信念而提出的,并成为近年来文献中热门的研究课题之一。Plantlet于2017年提出,其前身Sprout于2015年提出,是使用键控内部更新功能的流密码的著名算法。Sprout在很短的时间内就被许多研究者打破了,但Plantlet还没有被成功打破。传统上,流密码的密钥流生成器仅通过使用其当前的内部状态来更新其内部状态。由于在内部更新中使用密钥是一种新的方法,因此对这种方法的安全性分析还没有完全了解。本文对具有键控更新功能的密钥流生成器进行了安全性分析。提出了一种新的内部状态恢复和密钥恢复攻击算法,并以具有密钥更新功能的流密码为例,将其安装在Plantlet算法上。
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引用次数: 1
Opportunistic Temporal Fair Mode Selection and User Scheduling for Full-duplex Systems 全双工系统的机会时间公平模式选择和用户调度
Shahram Shahsavari, Farhad Shirani, M. Khojastepour, E. Erkip
In-band full-duplex (FD) communications - enabled by recent advances in antenna and RF circuit design - has emerged as one of the promising techniques to improve data rates in wireless systems. One of the major roadblocks in enabling high data rates in FD systems is the inter-user interference (IUI) due to activating pairs of uplink and downlink users at the same time-frequency resource block. Opportunistic user scheduling has been proposed as a means to manage IUI and fully exploit the multiplexing gains in FD systems. In this paper, scheduling under long-term and short-term temporal fairness for single-cell FD wireless networks is considered. Temporal fair scheduling is of interest in delay-sensitive applications, and leads to predictable latency and power consumption. The feasible region of user temporal demand vectors is derived, and a scheduling strategy maximizing the system utility while satisfying long-term temporal fairness is proposed. Furthermore, a short-term temporal fair scheduling strategy is devised which satisfies user temporal demands over a finite window-length. It is shown that the strategy achieves optimal average system utility as the window-length is increased asymptotically. Subsequently, practical construction algorithms for long-term and shortterm temporal fair scheduling are introduced. Simulations are provided to verify the derivations and investigate the multiplexing gains. It is observed that using successive interference cancellation at downlink users improves FD gains significantly in the presence of strong IUI.
由于天线和射频电路设计的最新进展,带内全双工(FD)通信已成为提高无线系统数据速率的有前途的技术之一。在FD系统中实现高数据速率的主要障碍之一是由于在同一时间-频率资源块上激活上行链路和下行链路用户对而导致的用户间干扰(IUI)。机会用户调度被提出作为一种管理IUI和充分利用FD系统多路复用收益的手段。本文研究了单蜂窝FD无线网络在长期和短期时间公平性下的调度问题。对于延迟敏感的应用程序来说,时间公平调度很重要,它会导致可预测的延迟和功耗。推导了用户时间需求向量的可行域,提出了在满足长期时间公平性的同时最大化系统效用的调度策略。在此基础上,设计了一种短期公平调度策略,在有限的窗口长度内满足用户的时间需求。结果表明,随着窗口长度的渐近增加,该策略可以获得最优的系统平均效用。随后介绍了长期和短期时间公平调度的实用构造算法。仿真结果验证了该方法的正确性和复用增益。可以观察到,在强IUI存在的情况下,在下行链路用户使用连续干扰消除可以显著提高FD增益。
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引用次数: 5
期刊
2019 IEEE 30th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC Workshops)
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