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

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Hybrid Nonorthogonal Multiple Access with Half and Full Duplex Cooperative Users 半双工和全双工合作用户的混合非正交多址
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8287897
Zhiyuan Lin, Wei Chen
In order to achieve high spectral efficiency, considerable attention has been paid to full-duplex (FD) and non-orthogonal multiple access (NOMA) technologies in the past decades. When FD users and half-duplex (HD) users access to the base station simultaneously, however, the rate region is still unknown. In this paper, we investigate hybrid NOMA (H-NOMA) systems, where a multi-antenna FD base station serves both a FD user and a HD uplink user over the same frequency band. The base station adopts successive interference cancellation (SIC) to decode the uplink signals, while the FD user is capable of adopting SIC to decode and cancel the inter-user interference. Given fixed transmission power, the achievable rate region of the H-NOMA system is the convex hull of the union of the rate regions of two alternative schemes with and without SIC at the FD user. Specifically, we derive the explicit expression of the rate region and demonstrate the potential of the proposed switching methods via numerical results.
为了实现更高的频谱效率,全双工(FD)和非正交多址(NOMA)技术在过去几十年中受到了广泛的关注。然而,当FD用户和半双工(HD)用户同时接入基站时,速率区域仍然是未知的。在本文中,我们研究了混合NOMA (H-NOMA)系统,其中多天线FD基站在同一频段上同时为FD用户和高清上行用户提供服务。基站采用逐次干扰抵消(SIC)对上行信号进行解码,FD用户可以采用逐次干扰抵消(SIC)对用户间干扰进行解码和消除。给定固定的传输功率,H-NOMA系统的可实现速率区域是FD用户处带SIC和不带SIC的两种备选方案速率区域联合的凸包。具体而言,我们推导了速率区域的显式表达式,并通过数值结果证明了所提出的开关方法的潜力。
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引用次数: 0
A Power Efficient Technique for Double Layer Massive MIMO Schemes 一种双层大规模MIMO方案的低功耗技术
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288135
Afonso Ferreira, Guilherme Gaspar, P. Montezuma, R. Dinis, D. Jayakody
Next generation of mobile communication systems must support astounding data traffic increases, higher data rates and lower latency, among other requirements. All these requirements should be met while assuring energy efficiency for mobile devices and base stations. Most likely, the future 5G systems will include massive MIMO (Multiple Input Multiple Output) schemes with dozen or hundreds of antennas enabling beamforming while operating in the millimeter wave spectrum. As soon as the millimetric wave propagation difficulties are overcome, the full potential of massive MIMO structures can be tapped. This paper presents a transmission system with bi-dimensional antenna arrays, based on a double layer structure combining beamforming with a multi-branch power amplification that achieves simultaneously power efficiency in amplification of multilevel constellations without penalties on system performance when compared with common schemes using only beamforming.
下一代移动通信系统必须支持惊人的数据流量增长、更高的数据速率和更低的延迟,以及其他要求。在保证移动设备和基站的能源效率的同时,必须满足所有这些要求。最有可能的是,未来的5G系统将包括大规模的多输入多输出(MIMO)方案,其中有数十个或数百个天线,可以在毫米波频谱中运行时实现波束形成。一旦克服了毫米波传播的困难,大规模MIMO结构的全部潜力就可以被挖掘出来。本文提出了一种基于波束形成与多支路功率放大相结合的双层结构的二维天线阵列传输系统,与仅使用波束形成的普通方案相比,该系统可以在不影响系统性能的情况下同时实现多层星座的放大功率效率。
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引用次数: 1
Optimizing Synchronous Handover in Cloud RAN 云RAN中的同步切换优化
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288048
T. Kolding, L. Chavarria, K. Pedersen
Radio networks are at the brink of a transformation in order to meet new requirements for high data and device densities expected for the Internet-of-Things (IoT) era. Cloud technology is positioned to be a key element in building effective 5G radio networks, so-called Cloud RANs. In this paper, we focus on Cloud RAN architectural benefits in relation to synchronous handovers without random access; an important enabler for ultra-low latency and ultra-high reliability services for high mobility IoT applications. We analyze the performance of Cloud RAN architectures and introduce a new concept for reducing the handover preparation time. Compared to today's distributed RAN architectures, we show a handover preparation time reduction of up to 60% for a wide range of interface and processing latency assumptions.
无线网络正处于转型的边缘,以满足物联网(IoT)时代对高数据和设备密度的新要求。云技术被定位为构建有效的5G无线网络(即所谓的云ran)的关键因素。在本文中,我们将重点关注云RAN架构在无随机访问的同步切换方面的优势;是为高移动性物联网应用提供超低延迟和超高可靠性服务的重要推动者。我们分析了云RAN架构的性能,并引入了减少切换准备时间的新概念。与今天的分布式RAN架构相比,我们展示了在广泛的接口和处理延迟假设下,切换准备时间最多减少60%。
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引用次数: 3
SWeRC: Self-Weighted Semi-Cooperative DSRC Congestion Control Based on LIMERIC 基于LIMERIC的自加权半协作DSRC拥塞控制
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288268
Torsten Lorenzen
Densities in Vehicular Ad-Hoc Networks (VANETs) are highly dynamic and the amount of information shared can easily exceed the limited resource capacity. LIMERIC, a state-of-the-art congestion control mechanism, is designed to reduce the network load by adjusting the message rate based on the current resource utilization. However, due to its fixed convergence parameters, it suffers from scalability and fails to provide stability under high densities. In this paper, I introduce Self-Weighted Rate Control (SWeRC) which achieves a scalability- independent, efficient, and fair resource allocation. I analyze the effect of the convergence parameters and subsequently introduce a parameter optimized algorithm. Based on an in-depth numerical evaluation, I investigate the performance of SWeRC and reveal optimal convergence parameters for both convergence speed and stability.
车辆自组织网络(vanet)的密度是高度动态的,共享的信息量很容易超过有限的资源容量。LIMERIC是一种最先进的拥塞控制机制,旨在根据当前资源利用率调整消息速率,从而减少网络负载。但由于收敛参数固定,其可扩展性较差,不能提供高密度下的稳定性。本文引入自加权速率控制(SWeRC),实现了可扩展性无关、高效、公平的资源分配。分析了收敛参数的影响,并介绍了一种参数优化算法。在深入的数值评估的基础上,研究了SWeRC的性能,并揭示了收敛速度和稳定性的最优收敛参数。
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引用次数: 2
Land Mobile Satellite Propagation Channel Characterization Based on RF Measurements and Fish-Eye Images 基于射频测量和鱼眼图像的陆地移动卫星传播信道表征
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8287900
J. Israel, M. Ait-Ighil
This paper is focused on the characterization of a mobile Radio Frequency (RF) receiver environment. Based on fish-eye images acquired simultaneously with the RF signal, the detection of the sky, the vegetation and the close obstacles is performed. This optical environment characterization exhibits a strong correlation with the direct RF signal classification as recommended by the International Telecommunication Union (ITU).
本文主要研究移动射频(RF)接收机环境的特性。基于与射频信号同步获取的鱼眼图像,对天空、植被和近距离障碍物进行检测。这种光学环境特性与国际电信联盟(ITU)推荐的直接射频信号分类有很强的相关性。
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引用次数: 2
Enhanced Algorithms for the IEEE 802.11p Deployment in Vehicular Ad Hoc Networks 车载Ad Hoc网络中IEEE 802.11p部署的改进算法
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288266
Yamen Y. Nasrallah, I. Al-Anbagi, H. Mouftah
The Enhanced Distributed Channel Access (EDCA) and the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) algorithms are used in the IEEE 802.11p standard to support Quality of Service (QoS) and reliable communication in Vehicular Ad hoc Networks (VANETs). An essential part of the CSMA/CA process is when a packet in an Access Category (AC) waits for an Arbitrary Inter- Frame Space (AIFS) period of time before engaging in the the backoff phase. According to the standard, AIFS values are fixed and deterministic, they do not guarantee strict priority for ACs especially when these values are combined with the Contention Window (CW) size of the backoff phase. On the other hand, the AIFS values are not adjustable, they do not adapt to the current status of the medium. In this paper, we propose two algorithms for AIFS value assignment, the Strict Priority Algorithm (SPA) and the Adaptive AIFS Algorithm (A3). With SPA, the AIFS values are fixed, but they are determined according to a mathematical formula that ensures strict priority level among the ACs. With A3, the AIFS values are adaptively changing depending on the value of the collision probability. AIFS still maintains a strict priority level assignment among the ACs.
IEEE 802.11p标准中使用增强型分布式信道接入(EDCA)和带避免碰撞的载波感知多址接入(CSMA/CA)算法来支持车载自组织网络(vanet)中的服务质量(QoS)和可靠通信。CSMA/CA过程的一个重要部分是当访问类别(AC)中的数据包在参与回退阶段之前等待任意帧间空间(AIFS)时间段。根据标准,AIFS值是固定的和确定的,它们不能保证ac的严格优先级,特别是当这些值与回退阶段的争用窗口(CW)大小相结合时。另一方面,AIFS值是不可调节的,它们不适应介质的当前状态。本文提出了两种AIFS赋值算法:严格优先级算法(SPA)和自适应AIFS算法(A3)。使用SPA时,AIFS值是固定的,但它们是根据一个数学公式确定的,该公式确保了ac之间严格的优先级。对于A3, AIFS值根据碰撞概率的值自适应变化。AIFS在ac之间仍然保持严格的优先级分配。
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引用次数: 11
Pilot Allocation and Sum-Rate Analysis in Distributed Massive MIMO Systems 分布式大规模MIMO系统中的导频分配与和速率分析
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288013
Ramiz Sabbagh, Huiling Zhu, Jiangzhou Wang
In distributed massive multi-input multi-output (DM-MIMO) systems, orthogonal pilot sequences are generally utilized to acquire the channel state information (CSI). However, this highly restricts the number of users simultaneously served. In this paper, a pilot reuse within a single cell DM-MIMO system is proposed to serve more users than the available pilot sequences. The reuse in this strategy is applied so that maximum achievable sum-rate is satisfied with the constraint of predefined pilot resource. On this basis, two users in different subcells separated by a large distance and satisfying a specific signal to interference plus noise ratio (SINR) level can share the same pilot sequence. An expression for SINR is derived for any pair of users who use the same pilot. Based on this expression, an algorithm is proposed to choose which pairs of users are able to use the same pilot with the constraint of satisfying the minimum SINR required for these users. The simulation results demonstrate that the uplink achievable sum-rate for the proposed strategy is higher than both cases when no pilot reuse or random pilot reuse are considered.
在分布式海量多输入多输出(DM-MIMO)系统中,通常采用正交导频序列来获取信道状态信息。然而,这极大地限制了同时服务的用户数量。本文提出了一种在单小区DM-MIMO系统中复用导频的方法,以服务比现有导频序列更多的用户。在预定义的导频资源约束下,实现了最大可达和速率。在此基础上,距离较远且满足特定信噪比(SINR)水平的不同子小区的两个用户可以共享相同的导频序列。对于使用同一导频的任何一对用户,都派生出SINR表达式。在此表达式的基础上,提出了一种算法,以满足这些用户所需的最小信噪比为约束,选择哪些用户对能够使用同一导频。仿真结果表明,该策略的上行可达和速率高于无导频复用和随机导频复用两种情况。
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引用次数: 3
On OFDM-Based Resource Allocation in LTE Radio Management System for Unmanned Aerial Vehicles (UAVs) 基于ofdm的无人机LTE无线电管理系统资源分配研究
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288175
Hiroki Nishiyama, Y. Kawamoto, Daisuke Takaishi
Unmanned aerial vehicles (UAVs) can be used for a wide variety of applications, including agriculture, infrastructure maintenance, and disaster response. In this paper, we focus on the use of UAVs for disaster response. Multiple UAVs equipped with communication terminals can be deployed to construct an airborne network connecting isolated areas. Another use is for real-time video transmission from a UAV to a ground station, using multiple UAVs operating simultaneously by different organizations, e.g., rescue teams, fire departments, broadcasting companies, and so forth. In both cases, frequency resources must be shared efficiently among adjacent UAVs. Thus, we describe a radio resource management system for UAVs. The focus of this paper is data communications, rather than the broader issue of command and control communications. First, we present experimental results from field experiments using WiFi communication terminals that do not have centralized radio resource management functionality. Then, we propose a centralized resource allocation technique that assumes an orthogonal frequency division multiplexing (OFDM)-based communication system, using resource blocks consistent with the long-term evolution (LTE) standard.
无人驾驶飞行器(uav)可用于各种各样的应用,包括农业,基础设施维护和灾害响应。在本文中,我们重点关注无人机在灾害响应中的应用。可以部署多架配备通信终端的无人机,构建连接孤立区域的机载网络。另一个用途是从一架无人机到一个地面站的实时视频传输,使用由不同组织同时操作的多架无人机,例如,救援队、消防部门、广播公司等等。在这两种情况下,频率资源必须在相邻无人机之间有效共享。因此,我们描述了一种无人机无线电资源管理系统。本文的重点是数据通信,而不是更广泛的命令和控制通信问题。首先,我们介绍了使用不具有集中无线电资源管理功能的WiFi通信终端进行的现场实验结果。然后,我们提出了一种集中的资源分配技术,该技术假设基于正交频分复用(OFDM)的通信系统,使用符合长期演进(LTE)标准的资源块。
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引用次数: 8
Hybrid Beamforming for Downlink Massive MIMO Systems with Multiantenna User Equipment 具有多天线用户设备的下行链路大规模MIMO系统的混合波束形成
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288022
S. Payami, M. Ghoraishi, M. Dianati
In this paper, a novel hybrid precoding algorithm is proposed for the downlink of a multiantenna multiuser massive multiple-input multiple-output (MIMO) system. Firstly, a modified block diagonalization precoding technique is presented. Then, it is shown that combining the modified block diagonalization with hybrid beamforming can achieve a similar sum-rate as block diagonalization with digital beamforming can. Moreover, the performance of the presented algorithm is comparable to the achievable rate in the single-user scenario where there is a full collaboration among the receivers. In a sparse scattering channel, the proposed technique has significantly higher sum-rate compared to a zero- forcing based hybrid beamformer. When digital phase shifters with 3-bits of resolution are used at the RF beamformer, the proposed algorithm achieves the performance of a hybrid beamforming algorithm with analog phase shifting.
针对多天线多用户海量多输入多输出(MIMO)系统的下行链路,提出了一种新的混合预编码算法。首先,提出了一种改进的块对角化预编码技术。结果表明,将改进的块对角化与混合波束形成相结合,可以获得与块对角化与数字波束形成相似的和速率。此外,该算法的性能可与接收器之间充分协作的单用户场景中可实现的速率相媲美。在稀疏散射通道中,与基于零强迫的混合波束形成器相比,该技术具有明显更高的和速率。当射频波束形成器采用3位分辨率的数字移相器时,该算法达到了模拟移相混合波束形成算法的性能。
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引用次数: 11
Unsupervised Clustering for Millimeter-Wave Channel Propagation Modeling 毫米波信道传播建模的无监督聚类
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288377
Jian Wang, C. Gentile, Jelena Senic, Ruoyu Sun, P. Papazian, Chiehping Lai
To date, we have designed and assembled millimeter-wave channel sounders at 60 GHz and 83 GHz. They can estimate the angle-of-departure and angle-of-arrival of channel multipath components as well as their delay and Doppler frequency shift. In addition, due to the fast acquisition time and because the receiver is mounted on a mobile robot, the systems can collect measurements for hundreds of different transmitter-receiver configurations in just minutes. It follows that channel-model reduction, including the multipath- component clustering process, must be reliable, consistent, and unsupervised. In this paper, we describe a simple clustering process tailored to the properties of millimeter-wave channels that fully exploits the multi-dimensionality of the extracted multipath components and requires only a few tunable parameters. Through extensive experimentation, we have verified that the process is robust and delivers consistent results across five different environments and across both frequency bands investigated. Illustrative examples are provided.
迄今为止,我们已经设计和组装了60 GHz和83 GHz的毫米波信道测深仪。它们可以估计信道多径分量的出发角和到达角,以及它们的延迟和多普勒频移。此外,由于采集时间短,并且接收器安装在移动机器人上,该系统可以在几分钟内收集数百种不同的收发配置的测量数据。因此,信道模型缩减,包括多路径组件聚类过程,必须是可靠的、一致的和无监督的。在本文中,我们描述了一种针对毫米波信道特性的简单聚类过程,该过程充分利用了提取的多径分量的多维性,并且只需要几个可调参数。通过广泛的实验,我们已经验证了该过程的鲁棒性,并在五种不同的环境和所调查的两个频段中提供一致的结果。提供了说明性示例。
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引用次数: 6
期刊
2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)
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