Wave Communication Technology Research Articles

NGHIÊN CỨU, ỨNG DỤNG MÔ-ĐUN NS-3 MMWAVE ĐÁNH GIÁ HIỆU NĂNG SÓNG MILIMET TRONG MẠNG THẾ HỆ MỚI 5G

The new generation mobile network 5G has become the main technology foundation in the architecture of the Internet of Things (IoT). In particular, millimeter wave communication technology in 5G is the core technology of the new generation network. Research on 5G networks faces many challenges in deploying real-life models to evaluate effectiveness. To resolve those issues, the article introduced the mmWave module integrated in the NS-3 network simulation toolkit to simulate and evaluate 5G network performance. The mmWave module is applied to simulate 5G network scenarios with the signal-to-noise ratio parameter SINR (Signal Interference + Noise Ration), thereby evaluating the wave quality from the base station to the terminal users to determine the most optimal location to build the base station.

Spatial Selectivity of Plasma Sheath Channel at Millimeter Wave Band for Hypersonic Vehicle

Millimeter wave is a potential way to overcome the blackout problem. However, the plasma sheath is axially nonuniform, and it has different effects on millimeter wave at different axial positions. In this article, the influences of the spatially inhomogeneous time-varying plasma sheath on millimeter waves are investigated. The electron density model is established, the time-domain sequence of the random channel is calculated, and the channel statistical parameters at different axial positions are extracted. The results show that the millimeter wave channel is spatially selective. Millimeter waves can transmit through the plasma sheath with less attenuation, multiplicative interference, and nonlinear effects at any position of the vehicle except the nose. When the antenna position is properly selected, the attenuation and multiplicative interference intensity can be further reduced. This indicates that millimeter wave communication technology is the most promising way to overcome the blackout problem and accomplish diverse communication tasks of a hypersonic vehicle.

Application of 5G Communication Technology in Power Communication and Research on Key Technologies

With the rapid development of power system and the deepening construction of smart grid, 5G communication technology is favored by all walks of life because of its ultra-low delay, ultra-high reliability, deep coverage, extreme capacity and ultra-low power consumption. It has become the key technology to lead scientific and technological innovation and promote the sustainable development of power system, providing a solid guarantee for the realization of human-computer interaction and Internet of Everything. This paper first introduces the network structure, basic principle and core features of 5G communication, and expounds the core slice of 5G communication and its three application scenarios; secondly, the potential demand scenarios of 5G communication in power system are analyzed in depth, that is, high capacity, high bandwidth and low delay business scenarios; finally, the key technologies of 5G communication, such as large-scale MIMO communication technology, ultra-dense heterogeneous network technology, green communication technology and millimeter wave communication technology, are discussed, and the linkage between current communication requirements and communication technologies is studied, which provides theoretical support for the application of 5G communication in power system.

A Study on the Development of Collision Avoidance System for Small-Sized Vessel Using WAVE Communication Technology

A Study on the Development of Collision Avoidance System for Small-Sized Vessel Using WAVE Communication Technology

Design and test of mine transducer and drive circuit

Based on the technical requirements of the mine acoustic wave communication technology for the controllable acoustic wave signal source, the effects of the transducer structure on the output impact performance are studied, including: pre-stressing, magnetostrictive material size and the number of coil turns, etc. Then we investigated the factors affecting the output impact performance of the drive power, including: peak voltage, boost time and peak current; After optimizing the design and test verification of the transducer structure and the driving power supply, a technical solution capable of meeting the mining communication needs is developed.

The Development of a Collision Warning System for Small-Sized Vessels Using WAVE Communication Technology

The Development of a Collision Warning System for Small-Sized Vessels Using WAVE Communication Technology

Research and Development of Millimeter Wave Technology

Abstract This paper introduces the concept of millimeter wave, analyzes the advantages and disadvantages and propagation characteristics of millimeter wave, and expounds the research status of millimeter wave ground communication and millimeter wave satellite communication. The military application of millimeter wave communication technology in electronic countermeasures is taken as an example. Finally, the outlook for millimeter wave communication technology will open up new application fields in the future and have broad development prospects.

차량용 무선통신기술(WAVE)의 철도 적용을 위한 성능검증

차량용 무선통신기술(WAVE)의 철도 적용을 위한 성능검증

공용도로에서의 통신방식에 대한 전파특성 분석 연구

Vehicular communications is system which can be applied for transmission of various safety messages or Intelligent Transportation Systems(ITS) applications by combining vehicle/road technology with Information and Communication Technology(ICT). In recent years, a variety of ITS services are available such as driving information, road conditions, V2X messages as well as navigation and traffic jams notification. In general, vehicular communications can be used for vehicle-to-vehicle and vehicle-to-infrastructure communication by adopting IEEE802.11p/1609 standard which is commonly known as wireless access in vehicular environments. In this paper, WAVE communication standard based on the IEEE802.11p is explained and signal characteristics in WAVE communication is introduced. Also, The H/W and S/W characteristics in Road Side Station and On Board Equipment for the Vehicle to Everything communication are analyzed. Received Signal Strength which is power of receiving signal of communication equipment is measured in test road to estimate the real WAVE communication's performance. It is shown that the implemented WAVE communication technology is satisfactory to provide ITS services.

5G Ultra-Dense Cellular Networks

Traditional ultra-dense wireless networks are recommended as a complement for cellular networks and are deployed in partial areas, such as hotspot and indoor scenarios. Based on the massive multiple-input multi-output antennas and the millimeter wave communication technologies, the 5G ultra-dense cellular network is proposed to deploy in overall cellular scenarios. Moreover, a distribution network architecture is presented for 5G ultra-dense cellular networks. Furthermore, the backhaul network capacity and the backhaul energy efficiency of ultra-dense cellular networks are investigated to answer an important question, that is, how much densification can be deployed for 5G ultra-dense cellular networks. Simulation results reveal that there exist densification limits for 5G ultra-dense cellular networks with backhaul network capacity and backhaul energy efficiency constraints.

Quadruple-wavelength THz modulator based on compound lattice PC with direct-coupled and side-coupled structure

As a key device of THz technologies, the THz modulator based on PC can realise the modulation of light waves. However, the traditional tunable PC modulator can only achieve a single beam of THz wave modulation by controlling a point defect, and multi-wavelength modulation can be realised by controlling the corresponding number of point defects with a complex operation. With the rapid development of microwave and light wave communication technology, the quadruple-wavelength THz modulator based on compound lattice PC can realise the 'on' and 'off' modulation of THz waves in quadruple-wavelength through the controlling of only two defects, using direct-coupled structure and side-coupled structure, respectively. We analyse and compare the performance of the quadruple-wavelength THz modulator based on compound lattice PC with the two kinds of structures. The results show that the contrast ratio is 44.6 dB and 13.8 dB, insert loss is 0.43 dB and 0.18 dB, and modulation rate is 7.1 GHz and 8.6 GHz of the modulator with direct-coupled structure and side-coupled structure, respectively. The modulator with direct-coupled structure has a higher contrast ratio, and can achieve modulation quadruple-wavelength of THz wave when the distance between the point defects is very short. The modulator with side-coupled structure is more excellent in the performance of insert loss and modulation rate.

5G wireless backhaul networks: challenges and research advances

5G networks are expected to achieve gigabit-level throughput in future cellular networks. However, it is a great challenge to treat 5G wireless backhaul traffic in an effective way. In this article, we analyze the wireless backhaul traffic in two typical network architectures adopting small cell and millimeter wave communication technologies. Furthermore, the energy efficiency of wireless backhaul networks is compared for different network architectures and frequency bands. Numerical comparison results provide some guidelines for deploying future 5G wireless backhaul networks in economical and highly energy-efficient ways.

Scattering of terahertz wave by charged spherical particles

The scattering characteristics of terahertz wave by a spherical particle are studied in this paper. A model, which can uniformly describe the expansion coefficients of uncharged, evenly charged and partially charged conditions, is developed and verified. The results of numerical calculation manifest that the scattering of terahertz wave is enhanced, whenever the particle is evenly or partially charged in the given frequency range, particle radius and the surface charge densities, compared with the uncharged case. Moreover, it is also found that the scattering of terahertz wave is basically monotonously enhanced if the particle is negatively charged; and it is basically non-monotonously enhanced if the particle is positively charged. Besides, the terahertz wave’s 3-D scattering field intensity distributions of uncharged, evenly charged and partially charged conditions are compared. In a word, this study is crucial to discuss the feasibility of terahertz wave communication technology in the complicated environment with charged particles. In addition, the potential application of this study in biomedical field is also proposed.