2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)最新文献_第2页

Parameter Estimation for Block Diagonalization Based Hybrid Beamforming in Massive MIMO Communications 大规模MIMO通信中基于块对角化的混合波束形成参数估计

2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall) Pub Date : 2019-09-01 DOI: 10.1109/VTCFall.2019.8891558

Kenta Tsuge, Yuyuan Chang, K. Fukawa, S. Suyama, Y. Okumura

{"title":"Parameter Estimation for Block Diagonalization Based Hybrid Beamforming in Massive MIMO Communications","authors":"Kenta Tsuge, Yuyuan Chang, K. Fukawa, S. Suyama, Y. Okumura","doi":"10.1109/VTCFall.2019.8891558","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891558","url":null,"abstract":"Massive multiple-input multiple-output (MIMO) will be employed in the 5th generation mobile communications (5G). To implement the massive MIMO, hybrid beamforming (HB) is one of the most promising techniques, because HB is composed of the analog beamforming (AB) and the digital beamforming (DB) and thus can decrease the number of baseband and radio frequency (RF) circuits significantly. Furthermore, HB can reduce a much larger amount of cost and power consumption than the full DB (FDB) configuration, which requires one baseband and RF circuit for each antenna element. This paper proposes a scheme to estimate both phases for phase rotators in AB and a precoding matrix for DB so that HB can approximate the block diagonalization (BD), which can nullify interference from the undesired users and form efficient transmit beams. For time division duplex (TDD) multiuser MIMO communications, the proposed scheme estimates the FDB channel matrix in the uplink (UL) and the phase for the phase rotators of AB in the downlink (DL). After obtaining an equivalent channel matrix from both the estimated FDB channel matrix and the AB precoding matrix, the scheme estimates the DB precoding matrix in DL from the equivalent channel matrix so that HB can approximate BD in DL. Computer simulations demonstrate that HB employing the proposed scheme can achieve DL average bit error rate (BER) performances that are little inferior to those of FDB.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":"11 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78238309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An Extensible Multi-Layer Architecture Model Based on LEO-MSS and Performance Analysis 基于LEO-MSS和性能分析的可扩展多层体系结构模型

2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall) Pub Date : 2019-09-01 DOI: 10.1109/VTCFall.2019.8891397

Yitao Li, Haichao Wei, Letian Li, Yuxi Han, Jiaxi Zhou, Wuyang Zhou

引用次数: 11

Dynamic User-Centric Clustering Design for Combined Transmission in Downlink LiFi System 下行LiFi系统中以用户为中心的组合传输动态聚类设计

2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall) Pub Date : 2019-09-01 DOI: 10.1109/VTCFall.2019.8890975

Weibin Ma, Lin Zhang, Furong Fang, Jing Bian

引用次数: 2

Online Task Offloading with Bandit Learning in Fog-Assisted IoT Systems 雾辅助物联网系统中强盗学习的在线任务卸载

2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall) Pub Date : 2019-09-01 DOI: 10.1109/VTCFall.2019.8891376

Xin Gao, Xi Huang, Ziyu Shao

{"title":"Online Task Offloading with Bandit Learning in Fog-Assisted IoT Systems","authors":"Xin Gao, Xi Huang, Ziyu Shao","doi":"10.1109/VTCFall.2019.8891376","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891376","url":null,"abstract":"In fog-assisted IoT systems, to achieve best quality of service with ultra-low latency, resource-limited IoT user nodes may offload some tasks to nearby fog nodes, a.k.a. task offloading, to accelerate their processing. However, it remains non-trivial and challenging to decide when and which fog node to offload to. If offloaded, user tasks may experience unexpectedly long latency in face of system uncertainties, such as wireless channel dynamics, variety in task processing time, and resource contention on fog nodes. Moreover, feedback signals such as processing latency can be delayed and even go outdated due to non- stationarity, thereby degrading the effectiveness of system statistic learning and decision making. In this paper, we study task offloading problem for fog-assisted IoT systems in a non-stationary environment with delayed feedback. By leveraging a drift detector and queue methods, we propose TOS-BB and TOS-BS, two online task offloading schemes with bandit learning that endeavor to achieve ultra-low task latency. Simulation results show that both schemes outperform the benchmark while achieving close- to-optimal performance with short task latency.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":"33 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72692243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Novel Over-the-Air Test Method for 5G Millimetre Wave Devices, Based on Elliptical Cylinder Reflectors 基于椭圆圆柱反射器的5G毫米波设备无线测试新方法

2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall) Pub Date : 2019-09-01 DOI: 10.1109/VTCFall.2019.8891596

David Reyes, M. Beach, M. Rumney, J. Haine, E. Mellios

{"title":"Novel Over-the-Air Test Method for 5G Millimetre Wave Devices, Based on Elliptical Cylinder Reflectors","authors":"David Reyes, M. Beach, M. Rumney, J. Haine, E. Mellios","doi":"10.1109/VTCFall.2019.8891596","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891596","url":null,"abstract":"The goals for 5G New Radio (NR) technology are to deliver wireless communications with higher capacity, performance, and efficiency compared with current mobile technologies. 5G NR will make effective use of the millimetre wave frequency spectrum to achieve these goals. However, these higher frequencies experience greater signal attenuation due to increased path loss and blockages. To overcome these, it is necessary to use high-gain directional active array antenna systems (AAS) at both ends of the communications link, which can steer the radiating beam in multiple directions. The cost-effective and compact implementation of the AAS requires the RF transceiver and antenna array to be highly integrated, making it impossible to independently test the performance of the constituent components due to the lack of inter-stage connectors. Further, the propagation channel is highly dynamic in both temporal and spatial domains. Hence, conformance testing of such systems is most effectively carried out using Over-The-Air (OTA) testing, since traditional conducted non-spatial test methods will not predict the radiated performance in space and the action of the RF transceiver, in particular, the beamformer. This paper presents a highly novel millimetre wave OTA test method facilitating the excitation of a Device Under Test (DUT) from multiple dynamic narrow angles of illumination, thus representing typical operating conditions and avoids the need for physical RF connections. This new method exploits the reflective properties of ellipsoidal surfaces and offers a cost-effective means when compared with other OTA test methods.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":"1 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77757995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Analysis of LTE in Two-Path Vehicular Repeater Channels 双路车载中继器信道中LTE的分析

2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall) Pub Date : 2019-09-01 DOI: 10.1109/VTCFall.2019.8891353

M. Lerch, P. Svoboda, Valentin Platzgummer, M. Rupp

{"title":"Analysis of LTE in Two-Path Vehicular Repeater Channels","authors":"M. Lerch, P. Svoboda, Valentin Platzgummer, M. Rupp","doi":"10.1109/VTCFall.2019.8891353","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891353","url":null,"abstract":"In recent years, many public high-speed trains have been upgraded with active in-train repeaters in order to improve mobile service coverage for train passengers. With a repeater in place, the user equipment perceives a wireless channel with a direct path and an indirect path through the repeater delayed by several micro seconds. In vehicular scenarios, the pick-up antenna experiences a wide range of signal levels. Due to the limited output power of the repeater, the paths may arrive with similar power, which can be a problem for OFDM based systems like LTE. Drive tests in LTE have shown that uplink performance degrades, even if the delay stays within the cyclic prefix. In order to gain a better understanding, we conducted a laboratory experiment to measure, quantify, and analyze the impact of two-path channels, with different delays and power levels, onto a live LTE network. Results show uplink performance degradation and increased transmit power even for delays smaller than the cyclic prefix due to non-optimal time-synchronization. In the system under test this degradation already starts at a path power difference of 15 dB and reaches up to 50% at equal path power levels.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":"25 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78108473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

In Vehicle Resource Orchestration for Multi-V2X Services 多v2x服务的车辆资源编排

2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall) Pub Date : 2019-09-01 DOI: 10.1109/VTCFall.2019.8891527

Mohammad Irfan Khan, S. Sesia, Jérôme Härri

引用次数: 3

Build Up a Real-Time LSTM Positioning Error Prediction Model for GPS Sensors 建立GPS传感器实时LSTM定位误差预测模型

2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall) Pub Date : 2019-09-01 DOI: 10.1109/VTCFall.2019.8891192

Sirui Yang, Tabatowski-Bush Ben, Weidong Xiang

引用次数: 4

Comparison of Empirical and Ray-Tracing Models for Mobile Communication Systems at 2.6 GHz 2.6 GHz移动通信系统经验模型与光线追踪模型的比较

2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall) Pub Date : 2019-09-01 DOI: 10.1109/VTCFall.2019.8891306

Jakob Thrane, D. Zibar, H. Christiansen

引用次数: 5

A Polar Code Based Unsourced Random Access for the Gaussian MAC 基于极性码的高斯MAC无源随机存取

2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall) Pub Date : 2019-09-01 DOI: 10.1109/VTCFall.2019.8891583

E. Marshakov, Gleb Balitskiy, K. Andreev, A. Frolov

引用次数: 53