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Beamformer Design with Smooth Constraint-Free Approximation in Downlink Cloud Radio Access Networks [article]

Fehmi Emre Kadan, Ali Özgür Yılmaz
2021 arXiv   pre-print
In Cloud Radio Access Network, which is a candidate solution in 5G and beyond, cooperation is applied by means of central processors (CPs) connected to simple remote radio heads with finite capacity fronthaul  ...  In this study, we consider a downlink scenario and aim to minimize total power spent by designing beamformers. We consider the case where perfect channel state information is not available in the CP.  ...  In 5G and beyond, Cloud Radio Access Network (C-RAN) is a candidate solution which uses multi-cell cooperation idea.  ... 
arXiv:2102.06916v1 fatcat:jdu3lpry35et5etb5rvi7uiy5i

Beamformer Design With Smooth Constraint-Free Approximation in Downlink Cloud Radio Access Networks

Fehmi Emre Kadan, Ali Ozgur Yilmaz
2021 IEEE Access  
In Cloud Radio Access Network, which is a candidate solution in 5G and beyond, cooperation is applied by means of central processors (CPs) connected to simple remote radio heads with finite capacity fronthaul  ...  In this study, we consider a downlink scenario and aim to minimize total power spent by designing beamformers. We consider the case where perfect channel state information is not available in the CP.  ...  Yilmaz: Beamformer Design With Smooth Constraint-Free Approximation in Downlink C-RANs In fact, we can use different a's for approximating P CP and for constraint shifting.  ... 
doi:10.1109/access.2021.3063668 fatcat:k4dhrpwlunawpocmzj5utzpjam

Large-Scale Convex Optimization for Ultra-Dense Cloud-RAN [article]

Yuanming Shi and Jun Zhang and Khaled B. Letaief and Bo Bai and Wei Chen
2015 arXiv   pre-print
The heterogeneous cloud radio access network (Cloud-RAN) provides a revolutionary way to densify radio access networks.  ...  In this article, we shall provide an algorithmic thinking on the new design challenges for the dense heterogeneous Cloud-RAN based on convex optimization.  ...  Moreover, with centralized coordination, effective dynamic resource allocation can be provided to smooth out spatial and temporal traffic fluctuations. 2) Radio Access Network: In heterogeneous Cloud-RAN  ... 
arXiv:1506.04243v1 fatcat:h45a7e4hmrfwteln76umylowaq

Energy efficiency techniques in ultra-dense wireless heterogeneous networks: An overview and outlook

Olumide Alamu, Abiodun Gbenga-Ilori, Michael Adelabu, Agbotiname Imoize, Oluwabusayo Ladipo
2020 Engineering Science and Technology, an International Journal  
Based on these categories, an overview of past works carried out on EE techniques in HetNets is provided with reference to their major contributions and key findings.  ...  However, ultra-dense deployment of small cells is envisioned to exacerbate network management and increase energy consumption in HetNets.  ...  In HetNets, the radio access technology developed based on this approach is known as heterogeneous cloud radio access networks (H-CRAN) .  ... 
doi:10.1016/j.jestch.2020.05.001 fatcat:2qpnwyfenfhxhhztmhppl2xrfu

Reliable broadband wireless communication for high speed trains using baseband cloud

Qinglin Luo, Wei Fang, Jinsong Wu, Qingchun Chen
2012 EURASIP Journal on Wireless Communications and Networking  
Through exploiting the baseband units (BBU) cloud and the ful frequent frequency reuse in the virtualized single cell, we also proposed a highly efficient joint transmit beamforming algorithm targeting  ...  This framework is featured with a new virtualized single cell design which mitigates the impact of conventional handover failures and guarantees continuous communication services.  ...  The relevant designs include: (1) Centralized Scheduling in the BBU Cloud All BBUs in the cloud are connected with fast data links, which would be less than 1 microsecond.  ... 
doi:10.1186/1687-1499-2012-285 fatcat:2xvqqryayvahrczpnhgigiigeu

2020 Index IEEE Transactions on Vehicular Technology Vol. 69

2020 IEEE Transactions on Vehicular Technology  
+ Check author entry for coauthors ami-mFading Channels With Integer and Non-Integerm; TVT March 2020 2785-2801 Hoang, T.M., Tran, X.N., Nguyen, B.C., and Dung, L.T., On the Performance of MIMO Full-Duplex  ...  Relaying System With SWIPT Under Outdated CSI; TVT Dec. 2020 15580-15593 Hodtani, G.A., see Gholami, R., TVT Sept. 2020 9938-9950 Hoki, K., see Kawakami, T., TVT Dec. 2020 16168-16172 Hong, C.,  ...  ., +, TVT Jan. 2020 807-817 Space-Domain Index Modulation for mmWave Cloud Radio Access Networks.  ... 
doi:10.1109/tvt.2021.3055470 fatcat:536l4pgnufhixneoa3a3dibdma

User-centric Cell-free Massive MIMO Networks: A Survey of Opportunities, Challenges and Solutions [article]

Hussein A. Ammar, Raviraj Adve, Shahram Shahbazpanahi, Gary Boudreau, Kothapalli Venkata Srinivas
2021 arXiv   pre-print
To solve this issue, exploring radically new network architectures with intelligent coordination and cooperation capabilities is crucial.  ...  This survey paper investigates the emerging user-centric cell-free massive Multiple-input multiple-output (MIMO) network architecture that sets a foundation for future mobile networks.  ...  ) [32] , cloud radio access network (C-RAN) [33] , multi-cell MIMO cooperative network [34] , virtual MIMO [35] , and small-cell networks [36] .  ... 
arXiv:2104.14589v2 fatcat:z7janupib5cytnedsnst4f6uua

Semidynamic Green Resource Management in Downlink Heterogeneous Networks by Group Sparse Power Control

Pan Cao, Wenjia Liu, John S. Thompson, Chenyang Yang, Eduard A. Jorswieck
2016 IEEE Journal on Selected Areas in Communications  
This paper addresses an energy-saving problem for the downlink of a cloud-assisted heterogeneous network (HetNet) using a time-division duplex (TDD) model, which aims to minimize the base stations (BSs  ...  carrier (FC) such that the signal processing and circuit power can be scaled with the effective bandwidth, thereby leading to multiple sleep modes for a BS in multi-FC systems.  ...  The CP could be either the central data center in the Cloud radio access network (C-RAN) or a macro BS who has the capability to do central optimization for the entire network.  ... 
doi:10.1109/jsac.2016.2545478 fatcat:dlm5amzmjnbu3jakuaiftnv2re

Semi-dynamic Green Resource Management in Downlink Heterogeneous Networks by Group Sparse Power Control [article]

Pan Cao, Wenjia Liu, John S. Thompson, Chenyang Yang, Eduard A. Jorswieck
2015 arXiv   pre-print
In particular, the successive convex approximation (SCA)-based algorithm is applied to solve a stationary solution to the original non-convex problem.  ...  This paper addresses the energy-saving problem for the downlink of heterogeneous networks, which aims at minimizing the total base stations (BSs) power consumption while each user's rate requirement is  ...  the Cloud radio access network (C-RAN) or a macro BS who has the capability to do central optimization for the entire network.November 6, 2018 DRAFT The symbol interval denotes the time consumed  ... 
arXiv:1511.06266v1 fatcat:wgxnriggzrchncirys7hb6mgge

A Survey on 5G Millimeter Wave Communications for UAV-Assisted Wireless Networks

Long Zhang, Hui Zhao, Shuai Hou, Zhen Zhao, Haitao Xu, Xiaobo Wu, Qiwu Wu, Ronghui Zhang
2019 IEEE Access  
In this paper, we provide a comprehensive survey on current achievements in the integration of 5G mmWave communications into UAV-assisted wireless networks.  ...  The deployment of UAVs has been regarded as an alternative complement of existing cellular systems, to achieve higher transmission efficiency with enhanced coverage and capacity.  ...  Under the context of the proactive deployment of cache-enabled UAVs in cloud radio access network (CRAN), Chen et al.  ... 
doi:10.1109/access.2019.2929241 fatcat:kwjjpcyhlrcwtjm4j5pn5ip5ta

Decentralized Baseband Processing for Massive MU-MIMO Systems

Kaipeng Li, Rishi R. Sharan, Yujun Chen, Tom Goldstein, Joseph R. Cavallaro, Christoph Studer
2017 IEEE Journal on Emerging and Selected Topics in Circuits and Systems  
(users transmit to base station) and beamforming in the downlink (base station transmits to users).  ...  Most existing algorithms are designed to be executed on centralized computing hardware at the base station (BS), which both results in prohibitive complexity for systems with hundreds or thousands of antennas  ...  In addition, we propose more sophisticated algorithms that enable superior error-rate performance compared to the methods in [19] , [20] . 2) Cloud radio access networks (C-RAN): The idea behind C-RAN  ... 
doi:10.1109/jetcas.2017.2775151 fatcat:5ov42ccgujf4npjr6w2dassem4

5G technology: towards dynamic spectrum sharing using cognitive radio networks

W. S. H. M. W. Ahmad, N. A. M. Radzi, F. S. Samidi, A. Ismail, F. Abdullah, M. Z. Jamaludin, M. N. Zakaria
2020 IEEE Access  
Moreover, a detailed survey on cognitive radio (CR) technology in SS related to 5G implementation is performed.  ...  The surveys and studies are categorised into one of the main SS techniques on the basis of network architecture, spectrum allocation behaviour and spectrum access method.  ...  The proposed architecture consists of four components, which are heterogeneous vehicular network, radio resource sharing cloud, the Internet and channel access.  ... 
doi:10.1109/access.2020.2966271 fatcat:cobdo5ucibcdpc5jfecbdwhni4

Decentralized Baseband Processing for Massive MU-MIMO Systems [article]

Kaipeng Li, Rishi Sharan, Yujun Chen, Tom Goldstein, Joseph R. Cavallaro, Christoph Studer
2017 arXiv   pre-print
(users transmit to base-station) and beamforming in the downlink (base-station transmits to users).  ...  Most existing algorithms are designed to be executed on centralized computing hardware at the base-station (BS), which results in prohibitive complexity for systems with hundreds or thousands of antennas  ...  In addition, we propose more sophisticated algorithms that enable superior error-rate performance compared to the methods in [18] , [19] . 2) Cloud radio access networks (C-RAN): The idea behind C-RAN  ... 
arXiv:1702.04458v2 fatcat:c572dvjok5eyvi63xh5wm547e4

Edge Artificial Intelligence for 6G: Vision, Enabling Technologies, and Applications [article]

Khaled B. Letaief, Yuanming Shi, Jianmin Lu, Jianhua Lu
2021 arXiv   pre-print
In this paper, we shall provide our vision for scalable and trustworthy edge AI systems with integrated design of wireless communication strategies and decentralized machine learning models.  ...  New design principles of wireless networks, service-driven resource allocation optimization methods, as well as a holistic end-to-end system architecture to support edge AI will be described.  ...  In summary, this section presented multiple access technologies (e.g., AirComp, grant-free random access, NOMA), multiple antenna techniques (e.g., Cloud-RAN, cell-free massive MIMO, RIS), and multiple  ... 
arXiv:2111.12444v1 fatcat:crrbtfylvjeihogumggdnxcbpq

Enhanced Group Sparse Beamforming for Green Cloud-RAN: A Random Matrix Approach [article]

Yuanming Shi and Jun Zhang and Wei Chen and Khaled B. Letaief
2017 arXiv   pre-print
Group sparse beamforming is a general framework to minimize the network power consumption for cloud radio access networks (Cloud-RANs), which, however, suffers high computational complexity.  ...  of inducing group sparsity in the beamforming vectors.  ...  With shared computation resources at the cloud data center and distributed low-cost low-power remote radio heads (RRHs), Cloud-RAN provides an ideal platform to achieve the benefits of network cooperation  ... 
arXiv:1711.06983v1 fatcat:c6yprwojo5azbc2lxxj3k3tc7u
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