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Implementation of adaptive channel scheme for multiclass traffic in wireless data communication
Published in Muhammad Arif, Guojun Wang, Mazin Abed Mohammed, Md Tabrez Nafis, Vehicular Ad Hoc Networks, 2023
Farjana Yeasmin Trisha, Mahmudul Hasan, Mohammad Farhan Ferdous, Muhammad Arif
Currently, two types of radio networks operate around the world: (i) one-to-many broadcast networks commonly work for public information and mass media entertainment and (ii) the two-way radio works more commonly for public safety, security, and public services such as police, fire, taxicabs, and delivery services.
Plant Security
Published in Frank R. Spellman, Fundamentals of Public Utilities Management, 2020
Two-way radios allow a user to contact another user or group of users instantly on the same frequency, and to transmit voice or data without the need for wires. They use “half-duplex” communications, or communication that can be only transmitted or received but cannot transmit and receive simultaneously. In other words, only one person may talk, while other personnel with radio(s) can only listen. To talk, the user depresses the talk button and speaks into the radio. The audio then transmits the voice wirelessly to the receiving radios. When the speaker has finished speaking and the channel has cleared, users on any of the receiving radios can transmit; either to answer the first transmission or to begin a new conversation. In addition to carrying voice data, many types of wireless radios also allow the transmission of digital data, and these radios may be interfaced with computer networks that can use or track these data. For example, some two-way radios can send information such as global positioning system (GPS) data, or the ID of the radio. Some two-way radios can also send data through a SCADA system.
Plant Security
Published in Frank R. Spellman, Handbook of Water and Wastewater Treatment Plant Operations, 2020
Two-way radios allow a user to contact another user or group of users instantly on the same frequency, and to transmit voice or data without the need for wires. They use “half-duplex” communications, or communication that can be only transmitted or received; it cannot transmit and receive simultaneously. In other words, only one person may talk, while other personnel with radio(s) can only listen. To talk, the user depresses the talk button and speaks into the radio. The audio then transmits the voice wirelessly to the receiving radios. When the speaker has finished speaking and the channel has cleared, users on any of the receiving radios can transmit, either to answer the first transmission or to begin a new conversation. In addition to carrying voice data, many types of wireless radios also allow the transmission of digital data, and these radios may be interfaced with computer networks that can use or track these data. For example, some two-way radios can send information such as global positioning system (GPS) data, or the ID of the radio. Some two-way radios can also send data through a SCADA system.
Everyman’s radio-telephone: how CB radio users mobilized West Germany’s communication culture
Published in History and Technology, 2019
Citizen Band (CB) radio relies on a simple two-way radio technology with rather inferior performance features. It lacks any operator or intermediary infrastructure, and any given channel can be listened to by anyone ‘online’ on his or her own station. As a short-range mobile communication medium, CB radio can only be used on a regional scale. The analog radio signals cover a radius of up to 15 or 20 kilometres, although in cities or when operated with low-power equipment this can shrink to a single kilometre. At the same time, these technical characteristics make CB radio an autonomous medium, open to anyone who owns a station. And indeed, users in the heyday of the CB era ultimately appropriated the medium in multiple ways, both on-the-go and domestically, precisely due to CB radio’s low-tech and low-cost characteristics.
Transformation of the Australian mining industry and future prospects
Published in Mining Technology, 2020
To date, the two-way radio communication system using UHF/VHF is the most common communication method in open pit mines. These radio communications are used in almost all mines because of the convenience of network configuration, reliability and safety of communication, and they often operate as emergency communication systems even if high-performance communication systems such as Wi-Fi or 3G/4G/LTE are built for mine autonomous operation systems.
Maritime cognitive radio spectrum sensing based on multi-antenna cyclostationary feature detection
Published in International Journal of Electronics, 2020
Jingbo Zhang, Feng Ran, Da Liu
The maritime cognitive radio communication system (MCRCS) conforms to the regional communication mode. Its communication model is shown in Figure 2. The PU is a marine two way radio, and the SU can be a mobile device at sea, such as an unlicensed ship. Each ship is equipped with facilities of performing cognitive radio functions. (i.e. they can perform spectrum sensing and configure their operating parameters).