Wireless Communication Technology
Wireless communication technology is a signal propagation method that relies on electromagnetic wave signals to be able to propagate in any direction in three-dimensional space at will to realize the propagation and exchange of information. With the rapid development of science and technology, wireless communication technology has become the most widely used technology in social life, and it plays an indispensable role in society, especially in the field of mobile communication. The wireless mobile communications field involves electromagnetic waves, satellite communications, and near field communications, etc., which are the most frequently contacted technologies in people’s lives. At the same time, this technology can also realize long-distance information transmission, so that people can communicate across distances.
Classification of wireless communication technologies
Among wireless communication technologies, it can be divided into several different wireless communication technologies, including WLAN technology, WiMax technology, mobile data technology, and satellite communication. Each has different characteristics. In WLAN technology, it belongs to a kind of wired network, which uses special broadband to realize the transmission of data and information. In a certain range of local area networks, there will be hackers to a certain extent. phenomenon. In WiMax technology, the launch time is relatively late, but it can meet the greatest needs of its users to the greatest extent, ensure that good communication signals can be obtained in indoor or outdoor environments, and finally realize the interconnection of information and data. . During the application of this technology, long-distance effective transmission can be realized. In terms of 3G technology, it has been widely used in commercial networks, and has been fully constructed and optimized in the process of continuous application. In terms of satellite communication technology, it mainly relies on satellites as the access equipment for signal data, so as to achieve good broadband information data transmission, which is quite good in terms of economic benefits, and also has considerable costs in terms of the construction cost of ground base stations. Favorable conditions, on the basis of bandwidth limitations, will bring considerable economic constraints.
Wireless communication is a communication method that uses the characteristics of electromagnetic wave signals to propagate in free space for information exchange. The wireless communication realized on the move is also commonly referred to as mobile communication, and people collectively refer to the two as wireless mobile communication. Several mainstream wireless communication technologies
ZigBee
ZigBee is an emerging short-range, low-rate wireless network technology, which is a technical solution between wireless tag technology and Bluetooth. It was previously known as HomeRF Lite or FireFly wireless technology, mainly used for short-range wireless connections. It has its own radio standard, which coordinates communication among thousands of tiny sensors. These sensors require very little energy and transmit data from one sensor to another through radio waves in a relay manner, so their communication efficiency is very high. Finally, these data can be entered into a computer for analysis or collected by another wireless technology such as WiMax.
The basis of ZigBee is IEEE 802.15.4, which is a standard of the IEEE Wireless Personal Area Network (PAN, Personal Area Network) working group, and is called the IEEE 802.15.4 (ZigBee) technical standard.
ZigBee is not just a name for 802.15.4. IEEE only deals with low-level MAC layer and physical layer protocols, so the ZigBee Alliance standardizes its network layer protocols and APIs. The full protocol is used for 4KB that can be directly connected to the basic point of a device at a time or 32KB as the coordinator of Hub and router. Each coordinator can connect up to 255 nodes, and several coordinators can form a network, and there is no limit to the number of routing transmissions. The ZigBee Alliance has also developed a security layer to ensure that this portable device will not accidentally leak its identification, and that this long-distance transmission using the network will not be obtained by other nodes.
EnOcean
The EnOcean wireless communication standard was adopted as the international standard "ISO/IEC 14543-3-10", which is also the only wireless international standard in the world that uses energy harvesting technology. The EnOcean energy harvesting module can harvest the energy generated in the surrounding environment, and obtain weak power from light, heat, electric waves, vibration, and human body movements. After the energy is processed, it is used to supply EnOcean's ultra-low-power wireless communication module to realize a truly data-free, power-free, and battery-free communication system. EnOcean wireless standard ISO/IEC14543-3-10 uses 868MHz, 902MHz, 928MHz and 315MHz frequency bands, and the transmission distance is 300 meters outdoors and 30 meters indoors.
Z-Wave
Z-Wave is a wireless networking specification led by the Danish company Zensys. Z-Wave is an emerging radio frequency-based, low-cost, low-power, high-reliability, short-range wireless communication technology suitable for networks. The working frequency band is 908.42MHz, and the effective coverage of the 868.42MHz signal is 30m indoors and more than 100m outdoors, which is suitable for narrow bandwidth applications. Z-Wave technology is also a low-power and low-cost technology, which strongly promotes low-speed wireless personal area networks.
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