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Free-space optical communication (FSO) is an optical communication technology that uses light propagating in free space to wirelessly transmit data for telecommunications or computer networking. "Free space" means air, outer space, vacuum, or something similar. This contrasts with using solids such as optical fiber cable.
Ultra-wideband is a radio technology that can use a very low energy level for short-range, high-bandwidth communications over a large portion of the radio spectrum. UWB has traditional applications in non-cooperative radar imaging. Most recent applications target sensor data collection, precise locating, and tracking. UWB support started to appear in high-end smartphones c. 2019.
Wireless communication is the transfer of information (telecommunication) between two or more points without the use of an electrical conductor, optical fiber or other continuous guided medium for the transfer. The most common wireless technologies use radio waves. With radio waves, intended distances can be short, such as a few meters for Bluetooth or as far as millions of kilometers for deep-space radio communications. It encompasses various types of fixed, mobile, and portable applications, including two-way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of applications of radio wireless technology include GPS units, garage door openers, wireless computer mouse, keyboards and headsets, headphones, radio receivers, satellite television, broadcast television and cordless telephones. Somewhat less common methods of achieving wireless communications involve other electromagnetic phenomena, such as light and magnetic or electric fields, or the use of sound.
This is an index of articles relating to electronics and electricity or natural electricity and things that run on electricity and things that use or conduct electricity.
Wireless sensor networks (WSNs) refer to networks of spatially dispersed and dedicated sensors that monitor and record the physical conditions of the environment and forward the collected data to a central location. WSNs can measure environmental conditions such as temperature, sound, pollution levels, humidity and wind.
Smart antennas are antenna arrays with smart signal processing algorithms used to identify spatial signal signatures such as the direction of arrival (DOA) of the signal, and use them to calculate beamforming vectors which are used to track and locate the antenna beam on the mobile/target. Smart antennas should not be confused with reconfigurable antennas, which have similar capabilities but are single element antennas and not antenna arrays.
In telecommunications, visible light communication (VLC) is the use of visible light as a transmission medium. VLC is a subset of optical wireless communications technologies.
Ian F. Akyildiz is a Turkish academic. He received his BS, MS, and PhD degrees in Electrical and Computer Engineering from the University of Erlangen-Nürnberg, Germany, in 1978, 1981 and 1984, respectively. Currently, he is the President and CTO of the Truva Inc. since March 1989. He retired from the School of Electrical and Computer Engineering (ECE) at Georgia Tech in 2021 after almost 35 years service as Ken Byers Chair Professor in Telecommunications and Chair of the Telecom group.
Multi-user MIMO (MU-MIMO) is a set of multiple-input and multiple-output (MIMO) technologies for multipath wireless communication, in which multiple users or terminals, each radioing over one or more antennas, communicate with one another. In contrast, single-user MIMO (SU-MIMO) involves a single multi-antenna-equipped user or terminal communicating with precisely one other similarly equipped node. Analogous to how OFDMA adds multiple-access capability to OFDM in the cellular-communications realm, MU-MIMO adds multiple-user capability to MIMO in the wireless realm.
In radio, cooperative multiple-input multiple-output is a technology that can effectively exploit the spatial domain of mobile fading channels to bring significant performance improvements to wireless communication systems. It is also called network MIMO, distributed MIMO, virtual MIMO, and virtual antenna arrays.
In radio, multiple-input and multiple-output, or MIMO, is a method for multiplying the capacity of a radio link using multiple transmission and receiving antennas to exploit multipath propagation. MIMO has become an essential element of wireless communication standards including IEEE 802.11n, IEEE 802.11ac, HSPA+ (3G), WiMAX, and Long Term Evolution (LTE). More recently, MIMO has been applied to power-line communication for three-wire installations as part of the ITU G.hn standard and of the HomePlug AV2 specification.
Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 3 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by another antenna connected to a radio receiver. Radio is widely used in modern technology, in radio communication, radar, radio navigation, remote control, remote sensing, and other applications.
Underwater acoustic communication is a technique of sending and receiving messages below water. There are several ways of employing such communication but the most common is by using hydrophones. Underwater communication is difficult due to factors such as multi-path propagation, time variations of the channel, small available bandwidth and strong signal attenuation, especially over long ranges. Compared to terrestrial communication, underwater communication has low data rates because it uses acoustic waves instead of electromagnetic waves.
A nanonetwork or nanoscale network is a set of interconnected nanomachines, which are able to perform only very simple tasks such as computing, data storing, sensing and actuation. Nanonetworks are expected to expand the capabilities of single nanomachines both in terms of complexity and range of operation by allowing them to coordinate, share and fuse information. Nanonetworks enable new applications of nanotechnology in the biomedical field, environmental research, military technology and industrial and consumer goods applications. Nanoscale communication is defined in IEEE P1906.1.
A Wireless powerline sensor hangs from an overhead power line and sends measurements to a data collection system. Because the sensor does not contact anything but a single live conductor, no high-voltage isolation is needed. The sensor, installed simply by clamping it around a conductor, powers itself from energy scavenged from electrical or magnetic fields surrounding the conductor being measured. Overhead power line monitoring helps distribution system operators provide reliable service at optimized cost.
Optical wireless communications (OWC) is a form of optical communication in which unguided visible, infrared (IR), or ultraviolet (UV) light is used to carry a signal. It is generally used in short-range communication.
One way of outlining the subject of radio science is listing the topics associated with it by authoritative bodies.
Rakhesh Singh Kshetrimayum, FIET, SMIEEE is an electrical engineer, educator and Professor in the department of Electronics and Electrical Engineering, Indian Institute of Technology Guwahati. Recently, he was listed in the world's top 2% scientists for the year 2021 by the researchers from Stanford University. Earlier in 2021 and 2020, he was also listed in the world's top 2% scientists for the year 2020 and 2019.
Spatial modulation is a technique that enables modulation over space, across different antennas (radio) at a transmitter. Unlike multiple-input and multiple-output (MIMO) wireless, in spatial modulation, only a single antenna among all transmitting antennas is active and transmitting, while all other remaining transmitting antennas sit idle. The duty of the receiver is: to estimate the active antenna index at the transmitter and to decode the symbol sent by the transmitting antenna.
Dinh Thuy Phan Huy, is a research engineer specializing in wireless networks. Her specific research interests include wireless communications and beamforming, spatial modulation, predictor antenna, backscattering and intelligent reflecting surfaces.
References
- ↑ Qammer H. Abbasi, Masood Ur Rehman, Khalid Qaraqe and Akram Alomainy, "Advances in Body-Centric Wireless Communications: Applications and Stateof- the-art", The Institution of Engineering and Technology (IET) Publication, July, 2016
- ↑ Khan, Mohammad Monirujjaman; Abbasi, Qammer Hussain; Alomainy, Akram; Clive, Parini (2014). "Experimental Investigation of Subject-Specific On-Body Radio Propagation Channels for Body-Centric Wireless Communications". Electronics. 3: 26–42. doi: 10.3390/electronics3010026 . ISSN 2079-9292.
- ↑ Safwat, Amr M. E. "Body-Centric Wireless Communications". Antennas & Electromagnetics Research Group. Retrieved 19 December 2015.
- ↑ Bhowal, A.; Kshetrimayum, R. S. (2019). "Performance analysis of B2B communication for different sporting activities". IEEE Sensors Letters. 3 (7): 1–4. doi:10.1109/LSENS.2019.2919443. S2CID 191186692.
- ↑ Bhowal, A.; Sapre, A. S.; Lalani, R.; Kshetrimayum, R. S. (2019). "Advanced Spatial Modulation and Spatial Media Based Modulation for efficient B2B communications in Sporting Activities". IET Communications. 13 (20): 3529–3536. doi:10.1049/iet-com.2019.0747. S2CID 209965181.
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