2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)最新文献_第7页

Uplink Massive MIMO Functional Split for C-RAN System Under Rapid User Mobility Conditions 快速用户移动条件下C-RAN系统的上行海量MIMO功能分离

2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) Pub Date : 2021-09-13 DOI: 10.1109/pimrc50174.2021.9569355

A. Davydov, V. Sergeev, A. Putilin, B. Mondal, Thushara C. Hewavithana, A. Papathanassiou, A. Sengupta

{"title":"Uplink Massive MIMO Functional Split for C-RAN System Under Rapid User Mobility Conditions","authors":"A. Davydov, V. Sergeev, A. Putilin, B. Mondal, Thushara C. Hewavithana, A. Papathanassiou, A. Sengupta","doi":"10.1109/pimrc50174.2021.9569355","DOIUrl":"https://doi.org/10.1109/pimrc50174.2021.9569355","url":null,"abstract":"Uplink massive multiple-input multiple-output (MIMO) improves network spectral efficiency by enabling simultaneous transmission from multiple users through spatial multiplexing. Although the centralized radio access network (C-RAN) architecture can meet the increased signal processing requirements, the large number of used antenna elements creates challenges for the fronthaul (FH) links required to transport a large amount of traffic from remote radio units (RRUs) to the centralized baseband unit (BBU). To reduce the FH link load, different baseband splitting options between RRUs and BBU are considered in practical C-RAN networks. More specifically, low complexity maximum ratio combining (MRC) beamforming at the RRU can be used to reduce the number of spatial dimensions of the received signals before transporting them to the BBU for further baseband processing. Despite the high compression efficiency of the MRC-based approach, we find that its performance is not sufficiently robust under channel varying conditions due to rapid user mobility. In this paper, we propose a functional split based on an extension of MRC compression at the RRU which provides better uplink performance for scenarios with high mobility, while guaranteeing moderate FH link throughput and low signal processing complexity.","PeriodicalId":283606,"journal":{"name":"2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122763236","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: 2

Deep Reinforcement Learning Based Caching Placement and User Association for Dynamic Cellular Networks 基于深度强化学习的动态蜂窝网络缓存布局和用户关联

2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) Pub Date : 2021-09-13 DOI: 10.1109/pimrc50174.2021.9569283

Yue Wang, Chunyan Feng, Tiankui Zhang

{"title":"Deep Reinforcement Learning Based Caching Placement and User Association for Dynamic Cellular Networks","authors":"Yue Wang, Chunyan Feng, Tiankui Zhang","doi":"10.1109/pimrc50174.2021.9569283","DOIUrl":"https://doi.org/10.1109/pimrc50174.2021.9569283","url":null,"abstract":"In cache-enabling cellular networks, we investigate the caching placement and content delivery. To cope with the time-varying content popularity and user location in practical scenarios, we formulate a long-term joint dynamic optimization problem of caching placement and user association for minimizing the content delivery delay. We decompose the optimization problem into two sub-problems, the user association sub-problem in short time-scale and the caching placement in long timescale. Specifically, we propose a low complexity belief propagation based user association algorithm in the short time-scale. Then we develop a deep deterministic policy gradient based caching placement algorithm in the long time-scale. Finally, we propose a joint user association and caching placement algorithm to obtain a sub-optimal solution for the proposed problem. We demonstrate the convergence and performance of the proposed algorithm by simulation results. Simulation results show that compared with the benchmark algorithms, the proposed algorithm reduces the long-term content delivery delay in dynamic networks effectively.","PeriodicalId":283606,"journal":{"name":"2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122244216","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: 2

Cloud Native Hardware Accelerated 5G virtualized Radio Access Network 云原生硬件加速5G虚拟化无线接入网

2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) Pub Date : 2021-09-13 DOI: 10.1109/PIMRC50174.2021.9569523

J. Dion, Julien Lallet, Laurent Beaulieu, Patrick Savelli, P. Bertin

{"title":"Cloud Native Hardware Accelerated 5G virtualized Radio Access Network","authors":"J. Dion, Julien Lallet, Laurent Beaulieu, Patrick Savelli, P. Bertin","doi":"10.1109/PIMRC50174.2021.9569523","DOIUrl":"https://doi.org/10.1109/PIMRC50174.2021.9569523","url":null,"abstract":"Cloud Radio Access Network consists in deporting and pooling radio processing on shared servers for a better use of computing resources, more agile operations, and thus optimizing costs and energy performance. Some of these processes at the radio physical layer are highly demanding in terms of computing power, which implies high energy consumption. Our approach enables the automatic activation of hardware programmable acceleration resources that are better suited to these processes in terms of performance and energy efficiency. Low-Density Parity-Check Forward Error Correction functions standardized in 5th Generation of Mobile Networks are offloaded on these hardware acceleration resources. Kubernetes-based orchestration is made compatible with the use of a edge computing accelerated heterogeneous infrastructure (CPU, GPU, FPGA) that can be distributed at the edge of the operator’s network to deploy the RAN Distributed Unit. We assess the proof-of-concept implementation of our approach and evaluate cost in data offloading and energy consumption. This prefigures a full cloud orchestration for 5G access, such as recommended in the O-RAN consortium.","PeriodicalId":283606,"journal":{"name":"2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121103151","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: 3

Where to Deploy Reconfigurable Intelligent Surfaces in the Presence of Blockages? 在存在阻塞的情况下，在哪里部署可重构智能表面?

2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) Pub Date : 2021-09-13 DOI: 10.1109/PIMRC50174.2021.9569657

Gourab Ghatak, Vikrant Malik, S. Kalamkar, Abhishek K. Gupta

{"title":"Where to Deploy Reconfigurable Intelligent Surfaces in the Presence of Blockages?","authors":"Gourab Ghatak, Vikrant Malik, S. Kalamkar, Abhishek K. Gupta","doi":"10.1109/PIMRC50174.2021.9569657","DOIUrl":"https://doi.org/10.1109/PIMRC50174.2021.9569657","url":null,"abstract":"Wireless communications aided by reconfigurable intelligent surfaces (RISs) is a promising way to improve the coverage for cellular users. The controlled reflection of the signal from RISs is especially useful in mm-wave networks when the direct link between a cellular user and its serving base station (BS) is weak or unavailable due to blockages. But the joint blockage of the user-RIS and the user-BS links may significantly degrade the performance of RIS-aided transmissions. This paper aims to study the effect of joint blockages on downlink performance. When the RIS locations are coupled with BS locations, using tools from stochastic geometry, we obtain an optimal placement of RISs either to minimize the joint blockage probability of the user-RIS and the user-BS links or to maximize the downlink coverage probability. The results show that installing RISs on the street intersections improves the coverage probability. For users associated with BSs that are deployed sufficiently close to intersections, the intersection-mounted RISs offer a better coverage performance compared to BS-coupled RISs.","PeriodicalId":283606,"journal":{"name":"2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129169441","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: 8

Performance Evaluation of GAM in Off-Body Path Loss Modelling for Body Area Networks GAM在体域网络离体路径损耗建模中的性能评价

2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) Pub Date : 2021-09-13 DOI: 10.1109/PIMRC50174.2021.9569725

Michał Laskowski, S. Ambroziak, L. Correia, K. Świder

引用次数: 0

On The Building Map for Radio Propagation Prediction Using Machine Learning 利用机器学习进行无线电传播预测的建筑图研究

2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) Pub Date : 2021-09-13 DOI: 10.1109/PIMRC50174.2021.9569521

Kazuya Inoue, K. Ichige, Tatsuya Nagao, Takahiro Hayashi

引用次数: 3

Secure Transmission Design Based on the Geographical Location of Eavesdropper 基于窃听者地理位置的安全传输设计

2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) Pub Date : 2021-09-13 DOI: 10.1109/pimrc50174.2021.9569471

Tao Li, Yongzhao Li, O. Dobre

引用次数: 1

Low-complexity AoA and AoD Estimation in the Transformed Spatial Domain for Millimeter Wave MIMO Channels 毫米波MIMO信道变换空间域的低复杂度AoA和AoD估计

2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) Pub Date : 2021-09-13 DOI: 10.1109/PIMRC50174.2021.9569292

Sandra Roger, Carmen Botella-Mascarell, Diego Lloria, M. Cobos, Gábor Fodor

{"title":"Low-complexity AoA and AoD Estimation in the Transformed Spatial Domain for Millimeter Wave MIMO Channels","authors":"Sandra Roger, Carmen Botella-Mascarell, Diego Lloria, M. Cobos, Gábor Fodor","doi":"10.1109/PIMRC50174.2021.9569292","DOIUrl":"https://doi.org/10.1109/PIMRC50174.2021.9569292","url":null,"abstract":"High-accuracy angle of arrival (AoA) and angle of departure (AoD) estimation is critical for cell search, stable communications and positioning in millimeter wave (mmWave) cellular systems. Moreover, the design of low-complexity AoA/AoD estimation algorithms is also of major importance in the deployment of practical systems to enable a fast and resource-efficient computation of beamforming weights. Parametric mmWave channel estimation allows to describe the channel matrix as a combination of direction-dependent signal paths, exploiting the sparse characteristics of mmWave channels. In this context, a fast Transformed Spatial Domain Channel Estimation (TSDCE) algorithm was recently proposed to perform parametric channel estimation with low complexity, which in turn results in a full characterization of the transmitting and receiving angles for dominant signal paths. In this paper, we analyze the AoA/AoD estimation capability and accuracy of the TSDCE algorithm in detail. We find that the TSDCE algorithm has a significant performance advantage with respect to the traditional approach, which is based on frequency domain processing, in complexity-constrained environments, especially at high signal-to-noise ratios.","PeriodicalId":283606,"journal":{"name":"2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115249709","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

Empirical evaluation of OFDM waveforms for VLC in the presence of LED nonlinearities LED非线性存在下VLC OFDM波形的经验评估

2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) Pub Date : 2021-09-13 DOI: 10.1109/PIMRC50174.2021.9569542

M. Laakso, A. Dowhuszko, R. Wichman

{"title":"Empirical evaluation of OFDM waveforms for VLC in the presence of LED nonlinearities","authors":"M. Laakso, A. Dowhuszko, R. Wichman","doi":"10.1109/PIMRC50174.2021.9569542","DOIUrl":"https://doi.org/10.1109/PIMRC50174.2021.9569542","url":null,"abstract":"Visible Light Communications (VLC) rely on LED light sources to transmit information wirelessly, offering an alter-native air interface to contemporary mobile networks using Radio Frequency bands for wireless connectivity. Most commercial LEDs found in the market nowadays have been designed for illumination, showing a notable non-linear response when per-forming the Electrical-to-Optical (E/O) conversion, particularly when using deep Intensity Modulation (IM) indexes for increased useful radiated power. Several different OFDM-based waveforms, adapted to the unipolarity requirement that IM demands, have been proposed in the literature. However, the performance of most of these Optical OFDM waveforms is seriously affected by the non-linear magnitude distortion of the low-cost white LEDs, particularly when the Peak-to-Average Power Ratio (PAPR) is high. To tackle this issue, this paper analyzes the performance of Constant-Envelope (CE) OFDM, a waveform that modulates the phase of an Intermediate Frequency (IF) carrier with a real-valued OFDM signal before its E/O conversion. The Bit Error Rate of CE-OFDM is compared to the one of DC-biased Optical OFDM and passband OFDM using a software-defined VLC demonstrator. CE-OFDM allows the VLC system to work in energy-efficient regimes, thanks to its robustness to the non-linear magnitude distortion introduced by the LED.","PeriodicalId":283606,"journal":{"name":"2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114210481","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

Angular Power Distribution in 60 GHz Wireless Uplink for Vehicle-to-Infrastructure Scenarios 车对基础设施场景下60ghz无线上行的角功率分配

2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) Pub Date : 2021-09-13 DOI: 10.1109/PIMRC50174.2021.9569535

J. Kelner, C. Ziółkowski, J. Wojtun, A. Chandra, A. Prokeš, T. Mikulášek, J. Blumenstein

引用次数: 1