scholarly journals 3D Antenna Structures Using Uniform Triangular Arrays for Efficient Full-Directional Multiuser Transmission

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Jiyeong Yang ◽  
Wonjae Ryoo ◽  
Wonjin Sung ◽  
Jeong-Ho Kim ◽  
Jonghyun Park
Keyword(s):  
Antenna Arrays ◽  
Large Scale ◽  
Multiple Input Multiple Output ◽  
Three Dimensional ◽  
System Capacity ◽  
Small Cells ◽  
Wave Band ◽  
Multiuser Transmission ◽  
Millimeter Wave Band ◽  
Mimo Transmission

In order to increase the system capacity of the 5G mobile communication system, multiple-input multiple-output (MIMO) transmission techniques using a large-scale array over the millimeter-wave band have attracted a great amount of attention. To cope with various types of receivers expected in 5G communications such as user equipment (UE) in small cells, indoor Internet-of-Things (IoT) devices at diverse locations, and drones performing aerial navigation, newer types of antenna arrays require all-directional transmission capability. Existing antenna structures with typical panel arrays, however, have restrictions on their transmission angles in both horizontal and vertical directions. In this paper, we propose to employ three-dimensional (3D) array structures composed of multiple triangular panels for efficient massive MIMO transmission of the next-generation wireless systems. We analyze beamforming characteristics of a uniform triangular array (UTA) suitable for such 3D array configurations and present a basic codebook applicable to UTAs. Using antenna structures with multiple UTA panels, multiuser transmission performance is evaluated to demonstrate the effectiveness of the proposal.

scholarly journals Distributed Hybrid Precoding for Indoor Deployments Using Millimeter Wave Band

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Sonia Gimenez ◽  
Daniel Calabuig ◽  
Sandra Roger ◽  
Jose F. Monserrat ◽  
Narcís Cardona
Keyword(s):  
Millimeter Wave ◽  
Antenna Arrays ◽  
Small Cell ◽  
System Capacity ◽  
Wave Band ◽  
Coverage Area ◽  
Hybrid Precoding ◽  
Millimeter Wave Band ◽  
Potential Benefits ◽  
Antenna Systems

Distributed Antenna Systems (DAS) are an alternative of network deployment that allows reducing the distance between transmitter and receiver by distributing the antennas throughout the coverage area. Moreover, the performance of the millimeter wave (mmWave) band can be significantly high within short transmitter-receiver distances. In this paper, the potential benefits of DAS deployments in the mmWave band are studied. To this aim, a distributed hybrid precoding (DHP) solution with remote antenna unit (RAU) selection capabilities is proposed and analyzed in an indoor DAS working in mmWaves and compared to two other indoor deployment strategies: a conventional cellular system with colocated antenna arrays and a small cell deployment. The results show that, using DHP, DAS not only brings huge gains to cell-edge users rate but also increases system capacity, becoming the best overall deployment. Further simulations including practical limitations have revealed that DAS using DHP is quite robust to combiner losses, although its performance is significantly degraded by outdated channel reports.

scholarly journals Magneto-Optical Isolator Based on Ultra-Wideband Photonic Crystals Waveguide for 5G Communication System

Crystals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 570 ◽  
Author(s):  
Yong Wang ◽  
Biaogang Xu ◽  
Dengguo Zhang ◽  
Shixiang Xu ◽  
Zheng Dong ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Communication Systems ◽  
High Efficiency ◽  
Three Dimensional ◽  
Transmission Efficiency ◽  
Ultra Wideband ◽  
Wave Band ◽  
Optical Isolator ◽  
Millimeter Wave Band ◽  
5G Communication

This paper presents a novel magneto-optical isolator based on an ultra-wideband and high efficiency photonic crystals (PCs) waveguide and gyromagnetic ferrites. The three-dimensional numerical simulation finds that the photonic crystals waveguide’s (PCW) transmission efficiency rises with its height and width. The corresponding experiments are performed by using a triangular lattice Al2O3 dielectric posts array in 5G millimeter wave band. The measured transmission efficiency is up to 90.78% for the optimal PCs waveguide structure, which has ultra-wide operating bandwidth from 23.45 to 31.25 GHz. The magneto-optical isolator is designed by inserting two rectangular gyromagnetic ferrites into the PCs waveguide. Due to the contrast between the effective permeability of the left and right circular polarization waves passing through the magnetized ferrite sheets, the ferromagnetic resonance absorption of the forward and reverse waves is different. By using finite element method, the isolation is optimized to be 49.49 dB for the isolator and its relative bandwidth reaches 8.85%. The high isolation, broadband, and easy integration indicate that our designed magneto-optical isolator has significant advantage in 5G communication systems.

scholarly journals Massive Mimo and Beamforming Techniques of 5G Networks

2019 ◽  
Vol 9 (1S5) ◽  
pp. 139-142
Keyword(s):  
Millimeter Wave ◽  
Spectral Efficiency ◽  
Beam Steering ◽  
Multiple Input Multiple Output ◽  
Wave Band ◽  
Data Rates ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Millimeter Wave Band ◽  
Mimo Technology

The need of wireless communication is increasing day to day life and it is mostly depends on spectral efficiency and bandwidth. The current operating wireless technologies are ranging between 300MHz to 3GHz band; consequently the 5G wireless network depends up on high frequency millimeter wave band ranging between 3GHz to 300GHz. The spectral efficiency can be improved by using Massive Multiple Input Multiple Output (MIMO) Technology. In this paper we are discussing MIMO along with some emerging technologies are present in 5G, they are Millimeter Wave, Beam Forming, and Beam Steering. By using these technologies the capacity is increased, higher data rates will be obtained, latency can be reduced and enhanced quality of service will occur.

scholarly journals Performance evaluation of wireless data traffic in Mm wave massive MIMO communication

2020 ◽  
Vol 20 (3) ◽  
pp. 1342
Author(s):  
Ahmed Thair Al-Heety ◽  
Mohammad Tariqul Islam ◽  
Ahmed Hashim Rashid ◽  
Hasanain N. Abd Ali ◽  
Ali Mohammed Fadil ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Massive Mimo ◽  
Multiple Input Multiple Output ◽  
Network Capacity ◽  
System Capacity ◽  
Small Cells ◽  
Data Traffic ◽  
Wireless Data ◽  
Wireless Backhaul ◽  
Input Multiple Output

<span>Due to the evaluation of mobile devices and applications in the current decade, a new direction for wireless networks has emerged. The general consensus about the future 5G network is that the following should be taken into account; the purpose of thousand-fold system capacity, hundredfold energy efficiency, lower latency, and smooth connectivity. The massive multiple-input multiple-output (MIMO), as well as the Millimeter wave (mm Wave) have been considered in the ultra-dense cellular network (UDN), because they are viewed as the emergent solution for the next generations of communication. This article focuses on evaluating and discussing the performance of mm Wave massive MIMO for ultra-dense network, which is one of the major technologies for the 5G wireless network. More so, the energy efficiencies of two kinds of architectures for wireless backhaul networks were investigated and compared in this article. The results of the simulation revealed some points that should be considered during the deployment of small cells in the two architectures UDN with backhaul network capacity and backhaul energy efficiency, that the changing the frequency bands in Distribution approach gives the same energy efficiency reached to 600 Mb/s at 15 nodes while the Conventional approach results reached less than 100 Mb/s at the same number of nodes.</span>

24GHz Digital beamforming radar with T-shaped antenna array for three-dimensional object detection

2012 ◽  
Vol 4 (3) ◽  
pp. 327-334 ◽  
Author(s):  
Marlene Harter ◽  
Tom Schipper ◽  
Lukasz Zwirello ◽  
Andreas Ziroff ◽  
Thomas Zwick
Keyword(s):  
Object Detection ◽  
Antenna Arrays ◽  
3D Imaging ◽  
Continuous Wave ◽  
Multiple Input Multiple Output ◽  
Three Dimensional ◽  
Two Dimensions ◽  
Radar System ◽  
3D Measurement ◽  
Digital Beamforming

This paper introduces a radar system for three-dimensional (3D) object detection and imaging. The presented 3D measurement method combines the frequency-modulated continuous wave (FMCW) approach for range measurements with a multiple-input multiple-output (MIMO) technique for digital beamforming in two dimensions. With an orthogonal arrangement of the antenna arrays for transmit and receive, the angular information is obtained in azimuth and elevation without mechanical beamsteering. The proposed principle allows performing 3D imaging by means of the acquired range, azimuth, and elevation information with a minimum of required hardware. Starting from the realization of the 3D radar imaging concept, the hardware architecture and the developed prototype are discussed in detail. Furthermore, the object detection capability of the 3D imaging radar system is demonstrated by measurements. The results show that the introduced 3D measurement concept in its realization is well suited for numerous applications.

Sign in / Sign up

Export Citation Format

Share Document