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

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Physical Layer Design of Energy-Efficient Data Transmission in 2D Communication Environments
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288145
Y. Masuda, H. Shinoda, A. Noda
This paper proposes a method to determine a physical layer (PHY) parameter that minimizes energy-per-bit rate (EBR) in a two-dimensional communication (2DC) environment. EBR is the power consumption used for 1- bit transmission/reception. 2DC uses a sheet-like waveguide medium, which guides the micro-wave along the sheet. In our previous work, the possibility of energy- efficient data transmission by using TransferJet devices in 2DC environment was reported. The reported maximum transmission rate was 71.1 Mbps with a power consumption of 118 mW. The EBR was two orders of magnitude lower than that of ZigBee despite the same power consumption. However, the data rate significantly degraded at some transceiver positions depending on the delay spread of the 2DC channel. The decrease of the transmission rate was caused by a mismatch between the PHY parameter of the communication system and the characteristics of the communication environment. This pa-per presents a method to determine an optimum PHY parameter for minimizing EBR. The experimental results demonstrate the feasibility of the energy-efficient data transmission in 2DC environments.
本文提出了一种在二维通信(2DC)环境中确定物理层(PHY)参数以使每比特能量率(EBR)最小化的方法。EBR是用于1位传输/接收的功耗。2DC使用片状波导介质,引导微波沿着片状波导。在我们之前的工作中,已经报道了利用TransferJet器件在2DC环境下实现高能效数据传输的可能性。据报道,最大传输速率为71.1 Mbps,功耗为118 mW。在功耗相同的情况下,EBR比ZigBee低两个数量级。然而,根据2DC信道的延迟扩展,数据速率在某些收发器位置显著降低。传输速率的降低是由于通信系统的物理层参数与通信环境的特性不匹配造成的。本文提出了一种最小化EBR的最佳物理量参数的确定方法。实验结果证明了在2DC环境下节能数据传输的可行性。
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引用次数: 0
Performance Evaluation of Low-Complexity FDE Receivers for Massive MIMO Schemes with 1-Bit ADCs 基于1位adc的大规模MIMO低复杂度FDE接收机性能评估
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288012
Ricardo Candeias, João Guerreiro, R. Dinis, P. Montezuma
Massive multiple input, multiple output (MIMO) schemes have been considered to support the physical layer of 5G systems and its combination with single-carrier with frequency-domain equalization (SC-FDE) schemes is particularly interesting for the uplink. However, the receiver complexity increases with the number of antennas, and it is important to have low complexity massive MIMO schemes. In this paper we consider the receiver design for the uplink of massive MIMO schemes where SC-FDE techniques are employed by the user terminals. To achieve this, we empoly low resolution analog-to- digital converters (ADCs) at each receive branch of the BS, combined with low complexity FDE techniques. It is shown that, although the nonlinear distortion levels inherent to the use of low resolution ADCs can be very high, we can have excellent performance, even with low complexity FDE receivers, provided that the number of receiver antennas is higher than the number of user terminals.
大规模多输入多输出(MIMO)方案被认为支持5G系统的物理层,其与单载波频域均衡(SC-FDE)方案的结合对于上行链路尤其有趣。然而,接收机的复杂度随着天线数量的增加而增加,因此采用低复杂度的大规模MIMO方案是非常重要的。本文研究了用户终端采用SC-FDE技术的大规模MIMO方案上行链路的接收机设计。为了实现这一目标,我们在BS的每个接收支路采用低分辨率模数转换器(adc),并结合低复杂性FDE技术。研究表明,尽管使用低分辨率adc所固有的非线性失真水平可能非常高,但只要接收天线的数量高于用户终端的数量,即使使用低复杂度的FDE接收器,我们也可以具有出色的性能。
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引用次数: 4
A Cross-Layer Downlink Scheduling Scheme for Balancing QoS in IEEE 802.16 Broadband Wireless Access Systems IEEE 802.16宽带无线接入系统中QoS均衡的跨层下行调度方案
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288186
H. Hamouda, M. O. Kabaou, M. Bouhlel
IEEE 802.16 OFDMA wireless network is expected to be the dominant system used by operators in these last decade due to its promising solutions for providing high data rate. However, IEEE 802.16 packet scheduling and resources assigning among Mobile Stations (MSs) is still the main challenge due to unfairness and low performance which occur when allocating resources to MSs. Furthermore, MaxSNR scheduler is often recognized by the scientific community as the most effective in OFDMA wireless networks. Thanks to its opportunistic operation, it takes into account changes in the states of links, maximizes system throughput and so can accommodate a very large number of users in the network. However, this does not come cheap: MSs far from the access point are systematically penalized compared to closer ones; this is because of their little favorable transmission conditions (caused by path loss). In this paper, we propose an improvement to MaxSNR scheduler called Dynamic and Fair MaxSNR (DFMaxSNR). The DFMaxSNR consists not only of exploiting the concept of opportunistic scheduler in order to maximize system throughput, but also of correcting the unequal spectral efficiencies induced by path loss attenuations in order to minimize the delay and the packet loss rate for real time applications. Performance evaluation shows that this well-balanced resource allocation scheme outperforms other existing schedulers (MaxSNR, PF and RR) and demonstrate that choosing between high system capacity and high fairness is not required.
IEEE 802.16 OFDMA无线网络有望成为运营商在过去十年中使用的主要系统,因为它有希望提供高数据速率的解决方案。然而,IEEE 802.16在移动站(MSs)之间的分组调度和资源分配仍然是主要的挑战,因为在向MSs分配资源时存在不公平和低性能。此外,MaxSNR调度器通常被科学界认为是OFDMA无线网络中最有效的调度器。由于它的机会操作,它考虑到链路状态的变化,最大限度地提高系统吞吐量,因此可以容纳网络中非常多的用户。然而,这并不便宜:远离接入点的MSs比更近的MSs系统地受到惩罚;这是因为它们很少有利的传输条件(由路径损耗引起)。在本文中,我们提出了一种改进MaxSNR调度器,称为动态和公平MaxSNR (DFMaxSNR)。DFMaxSNR不仅包括利用机会调度器的概念,以最大限度地提高系统吞吐量,而且还包括纠正由路径损耗衰减引起的不平等频谱效率,以最大限度地减少实时应用的延迟和丢包率。性能评估表明,这种平衡良好的资源分配方案优于其他现有的调度器(MaxSNR、PF和RR),并证明不需要在高系统容量和高公平性之间进行选择。
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引用次数: 8
Coordinationless Coordinated Fastlane Network Service in Wireless Multimedia Sensor Networks 无线多媒体传感器网络中的无协调快速通道网络服务
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288182
Zhonghu Xu, Kai Xing
Motivated by the observation that there is an increasingly aggravated conflict between the expanding sensor capabilities for sensing service/content and the limited network performance in wireless multimedia sensor networks (usually caused by cost, congestion, packet loss, resource limit, etc.), we provide a bottom-up approach to speedup the network by leveraging a group of nodes' (fog nodes) capacity and piling them up as a considerable amount for fastlane service. Specifically, our approach is based on the following designs: 1. A novel way for capacity cumulation based on temporal and spatial diversity of network content/service access: there always exists redundant resources and ability among other sensors in time and spatial domain that can be piled up as a considerable amount, though each piece may be really small; 2. Content/Service Recoding, it is often the case that some content/service access require various resources (e.g., bandwidth) at a sensor who cannot meet. we divide content/service into ultimate small slices; 3. fog computing based network virtualization and distributed coordination enable the fog nodes be efficiently connected, and the recoded fragmented content/service can pass through the formed virtual network. Based on theoretical analysis, it is shown that our approach could achieve global optimal request/resource allocation in a distributed manner and maximize the network service ability. The extensive experimental study conducted in various scenarios (TCP, UDP, and both, etc.) also shows that the proposed approach could adapt to different networking environments and achieve significant improvement of quality of service (QoS) and experience (QoE). Furthermore, our approach is shown to be able to achieve linear speedup as the number of fog nodes increases.
由于观察到无线多媒体传感器网络中用于传感服务/内容的不断扩展的传感器能力与有限的网络性能之间的冲突日益加剧(通常由成本、拥塞、数据包丢失、资源限制等引起),我们提供了一种自下而上的方法,通过利用一组节点(雾节点)的容量并将它们堆积成相当数量的快速通道服务来加速网络。具体来说,我们的方法基于以下设计:1。一种基于网络内容/服务访问时空多样性的容量积累新方法:在时间和空间域中,其他传感器之间总是存在冗余的资源和能力,这些资源和能力可以大量堆积,尽管每一块可能很小;2. 内容/服务重新编码,通常情况下,一些内容/服务访问需要各种资源(例如,带宽)在一个传感器不能满足。我们将内容/服务分成最终的小块;3.基于雾计算的网络虚拟化和分布式协同,使雾节点高效连接,编码后的碎片化内容/服务通过形成的虚拟网络。理论分析表明,该方法能够以分布式方式实现请求/资源的全局最优分配,使网络服务能力最大化。在各种场景(TCP、UDP、两者都有等)下进行的大量实验研究也表明,该方法能够适应不同的网络环境,并显著提高服务质量(QoS)和体验(QoE)。此外,我们的方法被证明能够随着雾节点数量的增加而实现线性加速。
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引用次数: 1
5G New Radio UL Coverage with Peak Clipping 5G新无线电UL覆盖与峰值裁剪
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288109
Toni Levanen, J. Kaikkonen, Sari Nielsen, K. Pajukoski, M. Renfors, M. Valkama
For the 5G new radio physical layer the CP-OFDM waveform has been chosen as the baseline for communications below 40 GHz. The requirement for multicarrier waveforms used for uplink is to achieve similar coverage as achieved by SC-FDMA in LTE uplink. In this paper, multiple candidate waveforms with enhanced CP-OFDM processing proposed for 5G incorporating realistic 3GPP compliant power amplifier model and peak clipping are evaluated in uplink transmission, and compared against SC-FDMA in terms of maximum average power amplifier output power and coded block error rate. It is shown that multicarrier waveforms have minor disadvantage in single-PRB transmission, but as the allocation size increases to encounter frequency selective fading the multicarrier waveforms provide similar or even improved link budget compared to SC-FDMA uplink. This implies that given the expected cell edge throughput requirements for 5G mobile broadband services and expected power amplifier development, enhanced CP-OFDM waveforms can achieve the uplink coverage requirement.
对于5G新无线电物理层,CP-OFDM波形已被选为40 GHz以下通信的基线。上行链路所使用的多载波波形要求达到与LTE上行链路中SC-FDMA相似的覆盖范围。本文在上行传输中评估了基于现实3GPP兼容功率放大器模型和峰值裁剪的5G增强CP-OFDM处理的多个候选波形,并在最大平均功率放大器输出功率和编码块错误率方面与SC-FDMA进行了比较。研究表明,多载波波形在单prb传输中有较小的缺点,但随着分配规模的增加,多载波波形与SC-FDMA上行链路相比,可以提供类似甚至更好的链路预算。这意味着,考虑到5G移动宽带业务的预期小区边缘吞吐量需求和预期功率放大器的发展,增强的CP-OFDM波形可以实现上行覆盖需求。
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引用次数: 2
An Optimized Fast Handover Scheme Based on Distributed Antenna System for High-Speed Railway 基于分布式天线系统的高速铁路快速切换优化方案
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288196
W. Ali, Junyuan Wang, Huiling Zhu, Jiangzhou Wang
High-speed trains have become one of the most leading transportation means, where each year the manufacture companies reach a new speed record. This progressive speed records increase the handover (HO) rate which makes it very difficult for high speed railway (HSR) mobile communication to sustain a reliable communication link. Utilizing distributed antenna systems (DASs) along with the two-hop architecture, this paper analyzes the conventional handover scheme based on this architecture and proposes a faster HO strategy. The proposed scheme reduces the HO latency and failure probability which could greatly improve the end-users quality of services (QoS). The analytical results show that the proposed scheme performs better than the conventional HO scheme.
高速列车已经成为最主要的交通工具之一,每年制造公司都达到新的速度记录。这种渐进式速度记录增加了切换率,使得高速铁路移动通信难以维持可靠的通信链路。利用两跳结构的分布式天线系统(das),分析了基于该结构的传统切换方案,提出了一种更快的HO策略。该方案降低了HO延迟和故障概率,极大地提高了终端用户的服务质量(QoS)。分析结果表明,该方案优于传统的HO方案。
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引用次数: 1
On the Power Allocation and Constellation Selection in Downlink NOMA 下行NOMA中的功率分配与星座选择
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288077
Estela Carmona Cejudo, Huiling Zhu, Osama Alluhaibi
In non-orthogonal multiple access (NOMA), signals of different users are independently encoded and modulated, then superposed in the power domain before transmission. The choice of a suitable combination of power allocation factor (PAF) and transmit constellations is hence critical to enhance the system performance. The aim of this work is to develop a tool for adaptively selecting a suitable PAF and transmit constellations for an enhanced system data rate, given some individual user bit error rate (BER) constraints that need to be jointly considered. For this purpose, analytical bit error probability (BEP) expressions are derived and evaluated. This is the first attempt to analytically evaluate the BER in NOMA systems. The expressions are evaluated in order to propose the best combination of MCS and PAF. The trade-offs involved in selecting a certain combination of transmit constellations and PAF are also investigated. Moreover, numerical evaluations prove that the attainable BEP at the near user is affected by that of the far user. Look-up tables of suitable combinations of PAF and transmit constellations are derived using the BEP expressions, with a focus on enhancing the system data rate for some given BER constraints at both users.
在非正交多址(NOMA)中,不同用户的信号被独立编码和调制,然后在传输前在功率域进行叠加。因此,选择合适的功率分配因子(PAF)和发射星座组合是提高系统性能的关键。这项工作的目的是开发一种工具,用于自适应地选择合适的PAF和传输星座,以增强系统数据速率,给定一些需要共同考虑的个人用户误码率(BER)约束。为此,推导并计算了解析误码率(BEP)表达式。这是对NOMA系统的误码率进行分析评估的首次尝试。为了提出MCS和PAF的最佳组合,对这些表达式进行了评价。研究了在选择发射星座和PAF的特定组合时所涉及的权衡。此外,数值计算还证明了近用户可达到的有效效率受到远用户有效效率的影响。使用BEP表达式导出了PAF和发射星座的合适组合的查找表,重点是在给定的误码率约束下提高两个用户的系统数据速率。
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引用次数: 30
Beamspace MIMO-NOMA for Millimeter-Wave Communications Using Lens Antenna Arrays 基于透镜天线阵列的毫米波通信波束空间MIMO-NOMA
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288345
Bichai Wang, L. Dai, Xiqi Gao, L. Hanzo
The recent concept of beamspace multiple-input multiple-output (MIMO) is capable of significantly reducing the number of radio-frequency (RF) chains required by millimeter-wave (mmWave) massive MIMO systems. However, the fundamental limit of the existing beamspace MIMO is that, the number of supported users cannot be higher than the number of RF chains using the same time-frequency resources. To break this limit, beamspace MIMO is integrated with non-orthogonal multiple access (NOMA) in the proposed MIMO-NOMA system in this paper, where the number of supported users can be higher than the number of RF chains. To reduce the inter-beam interference, a transmit precoding (TPC) scheme based on the principle of zero-forcing (ZF) is designed. Furthermore, a dynamic power allocation scheme is proposed for maximizing the achievable sum rate. Moreover, a low-complexity iterative optimization algorithm is conceived for dynamic power allocation. Simulation results show that the proposed beamspace MIMO-NOMA achieves a higher spectrum and energy efficiency than the existing beamspace MIMO for mmWave communications.
波束空间多输入多输出(MIMO)的最新概念能够显著减少毫米波(mmWave)大规模MIMO系统所需的射频(RF)链的数量。然而,现有波束空间MIMO的基本限制是,支持的用户数量不能高于使用相同时频资源的射频链数量。为了打破这一限制,在本文提出的MIMO-NOMA系统中,将波束空间MIMO与非正交多址(NOMA)相结合,支持的用户数量可以大于射频链的数量。为了减少波束间干扰,设计了一种基于零强迫原理的传输预编码方案。在此基础上,提出了一种可实现和率最大化的动态功率分配方案。提出了一种低复杂度的动态功率分配迭代优化算法。仿真结果表明,在毫米波通信中,所提出的波束空间MIMO- noma比现有的波束空间MIMO具有更高的频谱效率和能量效率。
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引用次数: 22
Investigating the Performance of the Random Access Channel in NB-IoT NB-IoT随机接入信道性能研究
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288195
R. Harwahyu, R. Cheng, Chia-Hung Wei
Narrowband Internet of Things (NB-IoT) is a new access technology introduced by 3GPP. It aims to support massive machine-type communications services in wide area. This work presents an analytical model to estimate access success probability and average access delay of random access (RA) procedure for three coverage enhancement (CE) levels in NB-IoT. The behavior of RA procedure in NB-IoT is analyzed and accuracy of the analysis is verified by computer simulations.
窄带物联网(NB-IoT)是3GPP引入的一种新的接入技术。它旨在支持大范围的大规模机器型通信服务。本文提出了一种分析模型,用于估计NB-IoT中三个覆盖增强(CE)级别的随机接入(RA)过程的接入成功率和平均接入延迟。分析了NB-IoT中RA过程的行为,并通过计算机仿真验证了分析的准确性。
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引用次数: 27
A Greedy Heuristic Algorithm for Context-Aware User Association and Resource Allocation in Heterogeneous Wireless Networks 异构无线网络环境感知用户关联与资源分配的贪婪启发式算法
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288055
Mohamad Zalghout, J. Hélard, M. Crussiére, Samih Abdul-Nabi, Ayman Khalil
Wireless heterogeneous networks are usually characterized by the integration of different types of radio access technologies (RATs) to enhance system capacity and meet user requirements. In this context, we formulate a user association and downlink resource allocation optimization problem to maximize the overall user-centric profit in the system. The context-awareness is based on the user preferences, the data rate requested by each user equipment (UE), and the RAT characteristics and constraints. The user preference is based on a normalized weighted profit function that considers both the received signal quality and the power consumption at UEs. To approximate the formulated optimization problem, a greedy heuristic algorithm with polynomial-time complexity is proposed. It is shown through persuasive simulations that the proposed heuristic algorithm, when compared to the trivial profit-function-based solution, enhances the average user satisfaction in the system and lowers the percentage of blocked data rate. In fact, the performance of the proposed heuristic algorithm comes close to the optimal solution while requesting a lower number of handovers (HOs).
无线异构网络的特点通常是集成不同类型的无线接入技术,以增强系统容量和满足用户需求。在此背景下,我们制定了用户关联和下行资源分配优化问题,以最大化系统中以用户为中心的整体利润。上下文感知基于用户偏好、每个用户设备(UE)请求的数据速率以及RAT特征和约束。用户偏好基于标准化加权收益函数,该函数同时考虑了ue的接收信号质量和功耗。为了逼近所提出的优化问题,提出了一种时间复杂度为多项式的贪心启发式算法。通过有说服力的仿真表明,与基于平凡利润函数的解决方案相比,所提出的启发式算法提高了系统的平均用户满意度,降低了阻塞数据率的百分比。事实上,所提出的启发式算法的性能接近最优解,同时请求更少的移交(HOs)。
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引用次数: 7
期刊
2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)
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