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2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)最新文献

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Dynamic Power Splitting Schemes for Non-Linear EH Relaying Networks: Perfect and Imperfect CSI 非线性EH中继网络的动态功率分割方案:完善与不完善的CSI
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8287945
This paper considers a non-linear energy harvesting (EH) model, better reflecting the properties of practical circuits compared to the linear model, in an amplify-and-forward (AF) relaying network. We focus on the design of relay's power splitting scheme to optimize the system outage performance, and derive the optimal power splitting ratios with both perfect and imperfect channel state information (CSI), respectively. Using the dynamic power splitting scheme, we find that the system outage performance is enhanced in the low signal-to-noise ratio (SNR) regime while converging to an upper bound in the high SNR regime. This finding is significant since it illustrates that the nonlinearity of practical energy harvester brings changes to the design of relaying networks. Simulation results are provided to support our work.
本文考虑了一种非线性能量收集(EH)模型,与线性模型相比,它能更好地反映实际电路的特性。重点设计了继电器的功率分割方案,以优化系统的中断性能,并分别推导了在完全信道状态信息(CSI)和不完全信道状态信息(CSI)下的最优功率分割比。利用动态功率分割方案,我们发现在低信噪比下系统的中断性能得到了提高,而在高信噪比下系统收敛到一个上界。这一发现具有重要意义,因为它说明了实际能量采集器的非线性会给继电网络的设计带来变化。仿真结果支持了我们的工作。
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引用次数: 15
LDLT Decomposition Based Spectrum Sensing in Cognitive Radio Using Hard Decision Criterion 基于LDLT分解的认知无线电频谱感知硬决策准则
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8287976
Inspired by random matrix theory, a quantity of eigenvalue based cooperative spectrum sensing methods have been proposed. The results are based on the asymptotical assumptions in need of large numbers of users and samples, which result in inferior performance with a few users. In this paper, sensing methods based on maximum eigenvalue and minimum eigenvalue of LDLT decomposition are proposed respectively with a view to improve the accuracy of decision threshold by means of hard decision criterion. The corresponding expressions of false alarm probability are also derived. Finally, both theoretical analyses and simulations demonstrate that the proposed two methods perform better than the existing eigenvalue based sensing methods for accurate decision threshold.
受随机矩阵理论的启发,提出了一系列基于特征值的协同频谱感知方法。结果基于渐近假设,需要大量用户和样本,这导致在少量用户时性能较差。本文分别提出了基于LDLT分解的最大特征值和最小特征值的感知方法,以期通过硬决策准则提高决策阈值的准确性。并推导出相应的虚警概率表达式。最后,理论分析和仿真结果表明,本文提出的两种方法比现有的基于特征值的感知方法更能获得准确的决策阈值。
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引用次数: 2
Fourth-Order Moment Analysis of Filtered Single-Carrier and OFDM Signals 滤波后单载波和OFDM信号的四阶矩分析
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8287937
This paper discusses a statistical property of single- carrier and OFDM signals pulse-shaped by the square- root raised-cosine (RRC) filter. In general, strictly band- limited signals exhibit high peak power, and the baseband signal with large signal dynamic range severely suffers from nonlinearity of power amplifiers. Therefore, in practical systems operated with a pulse-shaping filter, its roll-off factor (or excess bandwidth) should be carefully chosen considering the trade-off between the bandwidth and dynamic range of resulting signals. In this work, we investigate this trade-off relationship for the RRC-filtered single-carrier signals composed of statistically independent input symbols through the analysis of their fourth-order moments. The expression for the complementary cumulative distribution function (CCDF) of the instantaneous power in the case of RRC-filtered Gaussian signals is also developed, which serves as an accurate reference for the RRC-filtered OFDM signals with a large number of subcarriers. Based on these observations, we show that the RRC filtered OFDM signals tend to exhibit larger dynamic range than the conventional OFDM signaling filtered by a periodic sinc function.
本文讨论了经平方根提高余弦(RRC)滤波器形成脉冲的单载波和OFDM信号的统计特性。一般来说,严格限带信号峰值功率高,而信号动态范围大的基带信号受功率放大器非线性影响严重。因此,在使用脉冲整形滤波器的实际系统中,应仔细选择其滚降因子(或多余带宽),考虑带宽和产生的信号的动态范围之间的权衡。在这项工作中,我们通过分析由统计独立输入符号组成的rrc滤波单载波信号的四阶矩来研究这种权衡关系。给出了rrc滤波后高斯信号瞬时功率的互补累积分布函数(CCDF)表达式,为rrc滤波后含有大量子载波的OFDM信号提供了准确的参考。基于这些观察,我们发现RRC滤波后的OFDM信号比周期sinc函数滤波后的传统OFDM信号具有更大的动态范围。
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引用次数: 1
Security Modeling and Analysis on Intra Vehicular Network 车内网络安全建模与分析
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288289
Controller Area Network (CAN), the de facto standard in-vehicle network protocol, prompts modern automobile an integrated system that achieves real-time interactions with roads, vehicles and people. Yet such connectivity makes it feasible to illegally access, or even attack the CAN, causing not only privacy disclosure, property damage, but also life threat. In this paper, we analyze intrinsic weakness in CAN protocol that is mostly exploited by attackers and comprehensively survey the existing attacks based on CAN interfaces. Furthermore, we propose an attack evaluation system based on attack tree model and Markov chain to assess the probability of compromising CAN and the steady state of CAN system at the presence of these attacks. Finally, we simulate new steady state when altering the difficulty of a certain attack and the results demonstrate that sometimes improving defense of an attack declines the security level of the entire system instead.
控制器区域网络(CAN)是车载网络协议的实际标准,它促使现代汽车成为与道路、车辆和人实现实时交互的集成系统。然而,这种连通性使得非法访问甚至攻击CAN成为可能,不仅会造成隐私泄露、财产损失,还会造成生命威胁。本文分析了CAN协议中最容易被攻击者利用的固有弱点,并对现有的基于CAN接口的攻击进行了综合分析。在此基础上,我们提出了一种基于攻击树模型和马尔可夫链的攻击评估系统,以评估CAN被入侵的概率和CAN系统在这些攻击存在时的稳定状态。最后,我们模拟了改变攻击难度时新的稳态,结果表明,有时提高攻击防御反而降低了整个系统的安全级别。
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引用次数: 5
Path Loss Measurement and Modeling for Low-Altitude UAV Access Channels 低空无人机接入信道路径损耗测量与建模
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288385
Connecting unmanned aerial vehicles (UAVs) by using cellular networks can significantly expand the civil applications of UAVs, due to much a larger connectivity range and low cost. However, the low-altitude air-to-ground (ATG) channels are different from the traditional terrestrial mobile access channels, and hence need to be characterized specifically. In this paper, a measurement campaign and modeling of the aerial access channels between a UAV and base station (BS) in the typical urban macro-cell (UMa) and rural macro-cell (RMa) scenarios are presented. The channels were sounded at 2.412 GHz and 919 MHz with the horizontal ranges of 420 meters and 10 kilometers, respectively, in the two scenarios. The transmitter equipped with two omnidirectional antennas was fixed on a fourrotor UAV which flew horizontally at various altitudes from 25 to 150 meters. The receiver was installed on the top of five-storey buildings to emulate a BS. The path loss (PL) was measured and the statistical models have been proposed which are based on the corresponding 3GPP territorial channel models but adjusted by adding correction factors (CFs). The CF is relevant to the UAV height in the UMa scenario. For the RMa scenario there is a breaking point with respect to the horizontal distance and hence a segmented function for the CF is proposed. The new PL models can help to establish the ATG channel models and support the design of air-borne access technologies for the LTE networks.
利用蜂窝网络连接无人机,具有更大的连接范围和更低的成本,可以显著扩展无人机的民用应用。然而,低空空对地信道不同于传统的地面移动接入信道,因此需要对其进行具体的表征。本文介绍了典型城市宏蜂窝(UMa)和农村宏蜂窝(RMa)场景下无人机与基站(BS)之间的空中接入信道的测量活动和建模。在两种场景下,探测频率分别为2.412 GHz和919 MHz,水平距离分别为420米和10公里。配备两个全向天线的发射机固定在一架四旋翼无人机上,该无人机在25到150米的不同高度水平飞行。接收器被安装在五层楼高的建筑物的顶部,以模拟BS。测量了路径损耗(PL),并提出了基于相应的3GPP区域信道模型并通过添加校正因子(cf)进行调整的统计模型。在UMa场景中,CF与无人机高度相关。对于RMa场景,相对于水平距离有一个断点,因此提出了CF的分段函数。新的PL模型可以帮助建立ATG信道模型,并支持LTE网络的机载接入技术设计。
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引用次数: 35
Performance Analysis of Video Services over WLANs with Channel Bonding 信道绑定下无线局域网视频业务性能分析
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288167
An analytical model is developed to evaluate the network performance of an IEEE 802.11ac Wireless Local Area Network (WLAN) in support of delay sensitive video services over multiple channels. Specifically, the channel bonding probability and the channel access delay of wireless users are analyzed, considering the contentions among legacy and ac users in the same channel and across multiple channels. Based on the analysis, the network capacity region, i.e., the maximum number of traffic flows can be supported with the bounded delay performance in a multi-channel WLAN with and without channel bonding, is then derived. Our analysis shows that channel bonding can greatly improve the network capacity when the channel is under-utilized with a small number of legacy users co-existing with the ac users; yet channel bonding is not always favorable and it may degrade the network capacity when the number of legacy users increases due to the increased contentions in the network. The analysis provides important guidance for effective admission control and channel bonding strategies to guarantee the bonded service delay of realtime applications. Extensive simulations validate the analysis.
建立了一个分析模型来评估支持多通道延迟敏感视频业务的IEEE 802.11ac无线局域网(WLAN)的网络性能。具体地说,考虑到同一信道和跨多信道的遗留用户和交流用户之间的竞争,分析了无线用户的信道绑定概率和信道访问延迟。在此基础上,推导出在有信道绑定和无信道绑定的多信道无线局域网中,在有界延迟性能下所能支持的网络容量区域,即最大业务流数。分析表明,当信道利用率不足、少量遗留用户与交流用户共存时,信道绑定可以极大地提高网络容量;然而,信道绑定并不总是有利的,当遗留用户数量增加时,由于网络中的竞争增加,信道绑定可能会降低网络容量。分析结果对制定有效的准入控制和通道绑定策略以保证实时应用的绑定服务延迟具有重要的指导意义。大量的仿真验证了分析结果。
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引用次数: 3
Analysis of Broadcast Signaling for Millimeter Wave Cell Discovery 毫米波小区发现的广播信令分析
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288065
Millimeter wave (mm-wave) communication is essential for the next generation cellular networks. To exploit mm-wave frequencies, directional transmissions have to be applied to compensate the high propagation loss. Due to directional transmissions, initial access procedure of mm-wave communication systems needs specific design compared to conventional networks operating at sub-6 GHz. This paper focuses on an important step in the initial access procedure, namely broadcast signaling design for cell discovery. An analysis of such design is conducted based on an information theoretical approach, where four fundamental beam patterns, which cover most of the design options, are compared. Their performances in terms of cell discovery latency and signaling overhead are analyzed. The analysis reveals three key findings: (i) the average cell discovery latency depends only on beam duration and frame length, if the entire beacon interval can be accommodated in one frame; (ii) for low latency, single beam exhaustive scanning provides the best performance, but results in high signaling overhead; (iii) simultaneous multi-beam scanning can significantly reduce the overhead, and provide the flexibility to achieve trade-off between latency and overhead. The analytical results are verified by extensive simulations.
毫米波通信对下一代蜂窝网络至关重要。为了利用毫米波频率,必须采用定向传输来补偿高传播损耗。由于定向传输的原因,与传统的6 GHz以下网络相比,毫米波通信系统的初始接入过程需要特殊的设计。本文重点研究了初始接入过程中的一个重要步骤,即用于小区发现的广播信令设计。对这种设计进行了基于信息理论方法的分析,其中四种基本光束模式,涵盖了大多数设计选项,进行了比较。从蜂窝发现延迟和信令开销两方面分析了它们的性能。分析揭示了三个关键发现:(i)如果整个信标间隔可以容纳在一帧中,则平均蜂窝发现延迟仅取决于波束持续时间和帧长度;(ii)对于低延迟,单波束穷举扫描提供最佳性能,但导致高信号开销;(iii)同时多波束扫描可以显著降低开销,并提供灵活性,以实现延迟和开销之间的权衡。通过大量的仿真验证了分析结果。
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引用次数: 6
Achievable Rates of the MIMO Multiway Distributed-Relay Channel with Full Data Exchange 具有完全数据交换的MIMO多路分布式中继信道的可实现速率
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8287995
We consider efficient communications over the multiple-input multiple-output (MIMO) multiway distributed relay channel (MDRC) with full data exchange, where each user, equipped with multiple antennas, broadcasts its message to all the other users via the help of a number of distributive relays. We propose a physical-layer network coding (PNC) based scheme involving linear precoding for channel alignment, nested lattice coding for PNC, and lattice-based precoding for interference mitigation. We show that distributed relaying achieves the same sum-rate as cooperative relaying in the high SNR regime in most scenarios, which implies that the proposed scheme with distributed relays is more suitable for practical systems than the schemes with cooperative relays.
我们考虑在具有完整数据交换的多输入多输出(MIMO)多路分布式中继信道(MDRC)上的高效通信,其中每个用户配备多个天线,通过许多分布式中继的帮助向所有其他用户广播其消息。我们提出了一种基于物理层网络编码(PNC)的方案,包括用于信道对准的线性预编码、用于PNC的嵌套晶格编码和用于干扰缓解的基于晶格的预编码。结果表明,在大多数情况下,分布式中继与协同中继在高信噪比下的和速率相同,这表明分布式中继方案比协同中继方案更适用于实际系统。
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引用次数: 0
Efficient Flow Instantiation via Source Routing in Software Defined Vehicular Networks 软件定义车辆网络中基于源路由的高效流实例化
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288201
Software Defined Vehicular Networks (SDVN) brings a set of attractive features to vehicular networks along with an upgrade in the performance. Yet, SDVN suffers from frequently compelling to contact the centralized control plane, which in turn generates a high latency and packet overhead in the communication. The current solution to reduce the delay, proactive approach, does not bring the packet overhead down and impose a lot of stress on the controller with a decline of Packet Delivery Ratio (PDR). As an alternative, we introduce a source routing based flow instantiation operation with intelligent route caching that reduces the extent of communication with the control plane, but still manages to utilize the knowledge of controller while maintaining a lower latency and packet overhead.
软件定义车辆网络(SDVN)为车辆网络带来了一系列吸引人的特性,并在性能上进行了升级。然而,SDVN经常被迫与集中控制平面联系,这反过来又在通信中产生高延迟和数据包开销。目前减少延迟的解决方案是采用主动的方法,这种方法不仅没有降低数据包开销,而且对控制器施加了很大的压力,导致数据包投递率(packet Delivery Ratio, PDR)下降。作为替代方案,我们引入了一种基于源路由的流实例化操作,该操作带有智能路由缓存,减少了与控制平面的通信范围,但仍然设法利用控制器的知识,同时保持较低的延迟和数据包开销。
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引用次数: 7
Poster: Dynamic Charging Scheduling for EV Parking Lots with Renewable Energy 海报:可再生能源电动汽车停车场的动态充电调度
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288382
This paper addresses the optimal charging scheduling problem for Electric Vehicles (EVs) in an intelligent workplace parking lot powered by both the Photovoltaic Power (PV) System and the Power Grid. Due to the uncertain charging requirements of different EVs and time-varying available renewable energy, the charging load from the parking lot may bring a new challenge to the Power Grid. By minimizing total cost of the parking lot, we design a dynamic charging scheduling scheme to manage the charging processes of EVs based on the real- time information of EVs and renewable energy from the PV system. Numerical simulations are carried out to demonstrate the efficiency of the designed charging scheduling scheme.
研究了光伏发电系统和电网并网供电的智能工作场所停车场中电动汽车的最优充电调度问题。由于不同电动汽车充电需求的不确定性和可再生能源的时变,停车场的充电负荷可能给电网带来新的挑战。以最小化停车场总成本为目标,基于电动汽车的实时信息和光伏系统的可再生能源,设计了一种动态充电调度方案,对电动汽车的充电过程进行管理。通过数值仿真验证了所设计的充电调度方案的有效性。
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引用次数: 2
期刊
2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)
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