1,366 Hits in 4.7 sec

Interference-Avoidance Techniques: Improving Ubiquitous User Experience

Nicolas Gresset, Hardy Halbauer, Johannes Koppenborg, Wolfgang Zirwas, Hajer Khanfir
2012 IEEE Vehicular Technology Magazine  
These techniques also make use of down-tilt adaptation and therefore can benefit from the 3-D beamforming technology.  ...  In the next step, beamforming field trials with adaptive antenna arrays in a single-cell scenario with one or more UEs have been conducted [15] to test newly developed algorithms for beam pattern adaptation  ...  He joined Alcatel in 1985, where he worked on physical layer algorithms and application-specific integrated circuit development for high-capacity microwave links.  ... 
doi:10.1109/mvt.2012.2218434 fatcat:m277w5u4gjgarc6h37uwtf5c4u

Antenna Array Enabled Space/Air/Ground Communications and Networking for 6G [article]

Zhenyu Xiao, Zhu Han, Arumugam Nallanathan, Octavia A. Dobre, Bruno Clerckx, Jinho Choi, Chong He, Wen Tong
2022 arXiv   pre-print
However, enabling antenna array for space/air/ground communication networks poses specific, distinctive and tricky challenges, which has aroused extensive research attention.  ...  rapid development of electronic and information technologies, the demand for all-time, all-domain, and full-space network services has exploded, and new communication requirements have been put forward on  ...  To improve the throughput of cell-edge users, two interference alignments, termed interfering channel alignment based CoBF and interference alignment based CoBF, can be used [202] .  ... 
arXiv:2110.12610v2 fatcat:2awnzv7t7nhefal7o5rsopgwqa

Mobility Support for Millimeter Wave Communications: Opportunities and Challenges [article]

Jing Li, Yong Niu, Hao Wu, Bo Ai, Sheng Chen, Zhiyong Feng, Zhangdui Zhong, Ning Wang
2022 arXiv   pre-print
Then, to address users' mobility impact on the system performance in different application scenarios, we introduce several representative mobility models in mmWave systems, including human mobility, vehicular  ...  However, there exists limited progress on mobility support for mmWave communications until the deployment of adaptive beamforming techniques.  ...  [51] designed a beamforming scheme based on beam pattern, and provided an insight of applying beamforming in mmWavebased HST communications. He et al.  ... 
arXiv:2205.09214v1 fatcat:l7ekb4a3pnabxmnlr7wirpm55q

Analysis and Optimization of 5G Coverage Predictions Using a Beamforming Antenna Model and Real Drive Test Measurements

Marco Sousa, Andre Alves, Pedro Vieira, Maria Paula Queluz, Antonio Rodrigues
2021 IEEE Access  
Moreover, the non-calibrated 3GPP path loss model led to overestimations of the 5G coverage and user throughput up to 25% and 163%, respectively, when compared to the calibrated model predictions.  ...  , one vertical beam provides adequate indoor coverage and a maximized outdoor coverage after antenna tilt optimization.  ...  As can be concluded from Fig. 7 , with beamforming, radio coverage is no longer sector-based (or cell-based) but beam-based.  ... 
doi:10.1109/access.2021.3097633 fatcat:yfidg6fiszexjceb7ffwa7x43q

An enhanced design of a 5G MIMO antenna for fixed wireless aerial access

Faris A. Almalki, Marios C. Angelides
2021 Cluster Computing  
AbstractA recent market prediction is that 5G Fixed Wireless Access (FWA) will more than double over the next five years and trials at the same period in London suggest promising results.  ...  In response to some of those research challenges, this paper presents the design of a 5G Multiple Input Multiple Output (MIMO) Antenna that is mounted on a tethered aerostat, and the combination of which  ...  They report upto 60% cell edge capacity improvements. [16] assesses the performance of a 5G FWA case study using transmission and throughput as performance indicators. [17] reports on the experimental  ... 
doi:10.1007/s10586-021-03318-z fatcat:oyvnl3hamvgjlga5axm4imlyta

D2.3 Multi-agent Deep Reinforcement Learning Scheme Specifications

Yue Zhang, Lu Ge, John Cosmas, Ben Meunier, Geoffrey Eappen, Kareem Ali, Israel Koffman, Alexandre Kazmierowski, Victor Gabillon, Alexander Artemenko, Uwe Wostradowski, Ta Dang Khoa Le
2021 Zenodo  
Several applications of DRL are identified by the partners in relation to the general 6G BRAINS use cases defined in D2.1.  ...  Beamforming vector is obtained through DNN by using the predicted digital twin isotropic Transmissions from user equipment in a grid over the coverage area, and the predicted digital twin measured impulse  ...  Components Specifications Training Host The received SINR, opportunistic throughput for the UE in the particular IAB is monitored based on the changing beamforming vector.  ... 
doi:10.5281/zenodo.5786347 fatcat:hgquszibifar7pcjud6ckwkqkq

Low-Complexity Beam Selection Scheme for High Speed Railway Communications

Rui Jiang, Jiaqi Zhao, Youyun Xu, Xiaoming Wang, Li Zhang
2020 IEEE Access  
To reduce the number of handovers and improve system throughput, multi-stream beamforming with different beamwidths is used as the transmit beam at the base station (BS).  ...  In order to overcome such difficulty, a low-complexity beam selection scheme based on multi-stream beamforming is proposed in this paper.  ...  An adaptive beam adjusting algorithm based on multistream beamforming is proposed in [25] to maximize the throughput of the system. The scheme in [25] is called the previous scheme in this paper.  ... 
doi:10.1109/access.2020.2967065 fatcat:vbeoziydlrdvpfciyfu7yrshte


Sanjay Dhar Roy, Sumit Kundu
2008 Electromagnetic Waves  
Antenna arrays are also used in beamforming which could be used for improving cellular capacity [11, 12] and increasing the coverage [13] .  ...  By beamforming, BS can form specific beam for a specific user by calculating DOA (direction of arrival for EM wave).  ...  Here we assume that fixed beamforming has been used to cover all the users in a particular sector for paging, synchronization, call set up and adaptive beamforming has been used for traffic i.e. after  ... 
doi:10.2528/pier08102203 fatcat:5cnght523zedliddsxu425dhee

Radio Access Technologies for Fifth Generation Mobile Communications System: Review of Recent Research and Developments in Japan

Hidekazu MURATA, Eiji OKAMOTO, Manabu MIKAMI, Akihiro OKAZAKI, Satoshi SUYAMA, Takamichi INOUE, Jun MASHINO, Tetsuya YAMAMOTO, Makoto TAROMARU
2016 IEICE transactions on communications  
This paper focuses on providing a comprehensive survey of research and development activities on fifth generation mobile communication systems in Japan.  ...  Beamforming using adaptive antenna array (AAA) is a significant technique for flexible cell design.  ...  From the view points of increasing network capacity and improving Quality of Experience (QoE), network densification based on heterogeneous cell deployment using different cell sizes, in which small-cell  ... 
doi:10.1587/transcom.2015cci0004 fatcat:xa47wmjgrrc3zc7wzbrioiglke

Coordinated multipoint transmission and reception in LTE-advanced: deployment scenarios and operational challenges

Daewon Lee, Hanbyul Seo, Bruno Clerckx, Eric Hardouin, David Mazzarese, Satoshi Nagata, Krishna Sayana
2012 IEEE Communications Magazine  
The evaluated Heterogeneous Network is based on Scenario 3. For Scenario 4 the cell through-put and the Macro-cell coverage sum throughput would have been identical.  ...  Note that the cell splitting loss may be potentially recovered by designing control channels relying on user specific reference signals and transmitted only on a subset of coordinated TPs.  ... 
doi:10.1109/mcom.2012.6146494 fatcat:su3srrwpuzejfdbinrm4n4fxoa

Marginal Deep Architectures Based Massive MIMO Beam Forming and Predictions

Mithra Venkatesan, Anju. V.Kulkarni, Radhika Menon
2020 Helix  
This paper also briefs about the usage of marginal deep architecture based methods for beam forming and predictions.  ...  This paper explores the usage of deep learning architectures in beam forming and predictions in MIMO. Specifically, an improvised version of deep learning is the marginal deep architecture.  ...  Methodology Use of Deep Learning in Beamforming in MIMO There are many challenges in working MIMO in mmWave systems such as impact on coverage, reliability and need for frequent hand-off between base stations  ... 
doi:10.29042/2020-10-4-26-31 fatcat:7zqgohdlqvhx5fwafowxiumx5y


Thennarasan Sabapathy, Su Wei Tan, Teong Chee Chuah
2011 Progress in Electromagnetics Research B  
In this paper, we address the problem of reliable communication for LMDS networks in heavy rain regions by proposing a fuzzy weight controller based cell-site diversity (FWC-CSD) scheme.  ...  Rain cells are randomly simulated in an LMDS network to analyze the system performance using the proposed FWC-CSD scheme.  ...  In the past, rain attenuation mitigation techniques such as adaptive modulation, adaptive power control, fuzzy power control [2] and cell-site diversity (CSD) [3, 4] have been studied.  ... 
doi:10.2528/pierb10121004 fatcat:mz4k7oocdjhtlpj3fk4ggi5tr4

Resource Management in Converged Optical and Millimeter Wave Radio Networks: A Review

Doruk Sahinel, Simon Rommel, Idelfonso Tafur Monroy
2021 Applied Sciences  
Aiming to understand the relationship between resource management, virtualization, and the dense 5G access and fronthaul with an emphasis on converged radio and optical communications, this article presents  ...  An SDN controller-based power control framework with an adaptive ant colony optimization algorithm is proposed in [49] to avoid the frequent deactivation and reactivation of the lightpaths when new traffic  ...  Interference reduction is a common objective for throughput maximization in mmWave networks, and ML-based beamforming is used in [56, 59] to solve the traditional interference reduction problems.  ... 
doi:10.3390/app12010221 fatcat:ulcj36pc55dyzc3blznphjx25q

Distributed Coordinated Transmission with Forward-Backward Training for 5G Radio Access

Antti Tolli, Hadi Ghauch, Jarkko Kaleva, Petri Komulainen, Mats Bengtsson, Mikael Skoglund, Michael Honig, Eeva Lahetkangas, Esa Tiirola, Kari Pajukoski
2019 IEEE Communications Magazine  
To harness the gains of coordinated beamforming, fast information exchange over a backhaul connecting the cooperating base stations (BSs) is required.  ...  These impairments motivate the study of cooperative approaches based only on local channel state information (CSI) and which require minimal or no information exchange between the BSs.  ...  These approximation techniques are based on a prediction of the stream specific rate progression and overestimating the next point of approximation.  ... 
doi:10.1109/mcom.2018.1700199 fatcat:c24loerw7va37h2562iw3wlihm

Initial Access & Beam Alignment for mmWave and Terahertz Communications

Wissal Attaoui, Khadija Bouraqia, Essaid Sabir
2022 IEEE Access  
Then, we classify recent works related to beam alignment based on their objective functions (i.e., latency, power allocation, QoS, energy consumption, cost).  ...  In general, mmWave and terahertz communications require the use of directional antennas to seek narrow beams.  ...  In [83] , authors use stochastic geometry to analyze the SINR, the cell load, and the user throughput in RAT small cells.  ... 
doi:10.1109/access.2022.3161951 fatcat:wgwrvxyz7relpb3afo4rq3nbli
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