scholarly journals Research on 5G-Oriented Wireless Sensor Array of Millimeter Hybrid Beam Sensing Terminal

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Shengli Yan
Keyword(s):  
Channel Estimation ◽  
Millimeter Wave ◽  
Rapid Development ◽  
Mobile Internet ◽  
Projection Algorithm ◽  
Wireless Sensor ◽  
Digital Beamforming ◽  
Hybrid Beam ◽  
Hybrid Beamforming ◽  
Internet Of Things Technology

With the rapid development of information technology, facing the problems and new challenges brought by mobile Internet and Internet of things technology, as one of the key technologies of 5G, millimeter-wave mobile communication (28/38/60/70 GHz) which can realize gigabit (GB/s, or even higher) data transmission rate has also attracted extensive attention of wireless researchers all over the world, it has quickly become a research hotspot in the field of wireless communication. In the millimeter-wave massive MIMO downlink wireless sensor system, a block diagonal beamforming algorithm based on the approximate inverse of Neumann series is improved to obtain complete digital beamforming. Then, when designing hybrid beamforming, channel estimation and high-dimensional singular value decomposition are required for traditional analog and digital hybrid beamforming. A low complexity hybrid beamforming scheme is designed. An improved gradient projection algorithm is proposed in the design of analog beamforming, which can solve the problem of high computational complexity and less damage to guarantee and rate. Simulation results show that the hybrid beam terminal of the sensor reduces the number of RF links required for full digital beamforming and is as close to the spectral efficiency performance of full digital beamforming as possible. The results show that the performance of the designed hybrid beamforming scheme can still be close to that of the pure digital beamforming scheme without involving channel estimation and SVD decomposition.

Research of Greenhouse Environment Monitoring System

2014 ◽  
Vol 1030-1032 ◽  
pp. 1509-1512
Author(s):  
Chao Wang ◽  
Jian Ma
Keyword(s):  
Wireless Sensor Networks ◽  
Graphical User Interface ◽  
Rapid Development ◽  
Co2 Concentration ◽  
Wireless Sensor ◽  
Environment Monitoring ◽  
Environment Factor ◽  
Wireless Interfaces ◽  
Embedded Technique ◽  
Internet Of Things Technology

With the rapid development of Wireless Sensor Networks (WSN) and embedded technique, especially the widely application of Internet of Things technology, more and more attention has been paid in greenhouse monitor field. The aims design of system depends significantly on the application, and it must consider factors such as temperature, humidity, light intensity, co2 concentration and other environmental factors. These sensors are equipped with wireless interfaces with which they can communicate with one another to form a network. All the environment factor information gathers by PC and embedded device, and people also can control them through Graphical User Interface (GUI).

scholarly journals Second-Order Statistics-Based Semi-Blind Techniques for Channel Estimation in Millimeter-Wave MIMO Analog and Hybrid Beamforming

2020 ◽  
Vol 68 (11) ◽  
pp. 6886-6901
Author(s):  
Prem Singh ◽  
Suraj Srivastava ◽  
Aditya K. Jagannatham ◽  
Lajos Hanzo
Keyword(s):  
Channel Estimation ◽  
Order Statistics ◽  
Millimeter Wave ◽  
Second Order ◽  
Second Order Statistics ◽  
Hybrid Beamforming

scholarly journals Examination on Security Performance Analysis Model of Internet of Things Assigned Based on Composite Security Key

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Ying Sun ◽  
Lei Bai
Keyword(s):  
Internet Of Things ◽  
Ad Hoc ◽  
Rapid Development ◽  
Denial Of Service ◽  
Key Exchange ◽  
Wireless Sensor ◽  
Analysis Model ◽  
System Architectures ◽  
Memory Space ◽  
Internet Of Things Technology

Rapid development of Internet of Things technology makes the Internet interact and communicate with objects in the real world. The diversity of Internet of Things’ system architectures and the diversity of networks determine the complexity of their security issues. A key step in building an Internet of Things’ security system is to build a model and evaluate threats of security. First, this paper studies the distribution of key security about mobile ad hoc networks and analyzed the characteristics of the scene. To promote the certification of the key exchange strategy of both sides, it supports key exchange between the core node and multiple nodes for existing problems that management scheme of random key preallocation is limited by the storage space of the node through combination of key matrix elements which has less information to generate a large number of keys, and each sensor node only needs to store related parameters and key matrix. It saves the memory space of node greatly. The results of simulation show that the program has a strong security; it can fight against the common attacks of wireless sensor networks, such as node forgery attacks, message replay attacks, and denial of service attacks. At the same time, it is superior to traditional solutions in terms of network connectivity and nondestructibility, which can apply clustered wireless sensor network massively.

Design of Channel Estimation for Hybrid Beamforming Millimeter-Wave Systems in the Presence of Beam Squint

2021 ◽  
pp. 1-10
Author(s):  
Song Noh ◽  
Jaekoo Lee ◽  
Heejung Yu ◽  
Jiho Song
Keyword(s):  
Channel Estimation ◽  
Millimeter Wave ◽  
Hybrid Beamforming

scholarly journals ANALISIS ESTIMASI SUDUT KEDATANGAN MENGGUNAKAN ALGORITMA ESPRIT PADA KOMUNIKASI MILLIMETER-WAVE UNTUK HYBRID BEAMFORMING

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Egi Ari Wibowo ◽  
Heroe Wijanto ◽  
Iswahyudi Hidayat
Keyword(s):  
Millimeter Wave ◽  
Digital Beamforming ◽  
Hybrid Beamforming ◽  
Rf Chain

Beberapa tahun belakangan ini, pertumbuhan traffic komunikasi wireless semakin meningkat pesat, hal inimenyebabkan ketersedian pita frekuensi semakin menipis. Cara untuk mengatasinya adalah denganmemanfaatkan pita frekuensi tinggi yaitu pada band millimeter-wave (mm-wave). Banyaknya antena yangdigunakan pada teknologi mm-wave untuk mengatasi pathloss yang besar, akan teetapi dapatmengakibatkan kompleksitas yang tinggi pada sisi hardware jika menggunakan digital beamforming,karena satu RF chain terhubung dengan satu antena. Hybrid beamforming digunakan untuk meminimalisirpenggunaan RF chain, sehingga kompleksitas pada sisi hardware menurun. Pada penelitian kali ini, telahdilakukan analisis algoritma ESPRIT pada hybrid beamforming untuk meningkatkan performansi sistemdalam hal penentuan posisi dan lokasi dari user atau sering disebut estimasi DOA yang nantinya akandigunakan dalam proses beamforming. Dari penelitian yang dilakukan, hasilnya adalah semakin banyakantena, RF chain, dan semakin besar nilai SNR yang digunakan maka akurasi algoritma ESPRIT dalammelakukan estimasi DOA akan semakin tinggi. Sedangkan jika semakin banyak sudut datang makaakurasinya akan semakin menurun. Hasil akurasi terbaik terjadi saat menggunakan jumlah antenna 8�8dan RF chain sebanyak 6, dengan nilai ? sebesar 0,00186� dan nilai BER sebesar 5,7�10�6.

Hybrid beamforming and DFT-based channel estimation for millimeter wave MIMO systems

2017 ◽  
Author(s):  
Maliheh Soleimani ◽  
Robert C. Elliott ◽  
Witold A. Krzymien ◽  
Jordan Melzer ◽  
Pedram Mousavi
Keyword(s):  
Channel Estimation ◽  
Millimeter Wave ◽  
Mimo Systems ◽  
Hybrid Beamforming

scholarly journals Hybrid Beamforming for Millimeter-Wave Heterogeneous Networks

Electronics ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 133 ◽  
Author(s):  
Mostafa Hefnawi
Keyword(s):  
Millimeter Wave ◽  
Heterogeneous Networks ◽  
Antenna Arrays ◽  
Large Scale ◽  
Network Capacity ◽  
Base Station ◽  
Antenna Element ◽  
Digital Beamforming ◽  
Hybrid Beamforming ◽  
Cell Base

Heterogeneous networks (HetNets) employing massive multiple-input multiple-output (MIMO) and millimeter-wave (mmWave) technologies have emerged as a promising solution to enhance the network capacity and coverage of next-generation 5G cellular networks. However, the use of traditional fully-digital MIMO beamforming methods, which require one radio frequency (RF) chain per antenna element, is not practical for large-scale antenna arrays, due to the high cost and high power consumption. To reduce the number of RF chains, hybrid analog and digital beamforming has been proposed as an alternative structure. In this paper, therefore, we consider a HetNet formed with one macro-cell base station (MBS) and multiple small-cell base stations (SBSs) equipped with large-scale antenna arrays that employ hybrid analog and digital beamforming. The analog beamforming weight vectors of the MBS and the SBSs correspond to the the best-fixed multi-beams obtained by eigendecomposition schemes. On the other hand, digital beamforming weights are optimized to maximize the receive signal-to-interference-plus-noise ratio (SINR) of the effective channels consisting of the cascade of the analog beamforming weights and the actual channel. The performance is evaluated in terms of the beampatterns and the ergodic channel capacity and shows that the proposed hybrid beamforming scheme achieves near-optimal performance with only four RF chains while requiring considerably less computational complexity.

Sign in / Sign up

Export Citation Format

Share Document