【正文】 the end user / device (Client ).First, the degree of standardization from the point of view, the technology covered by this report, only WMN technology is not mature standard system, LMDS, MMDS, cluster munication are a variety of standard, but there is no uniform international standards, the rest of the technology has been pleted standardization work, and have carried out a test network construction and business network construction.From a frequency point of view, the WiFi technology of WMN are opening band, the WiMax technology, 3G technology and other technologies use licensed spectrum.Judging from the coverage of WiFi technology of WMN technology a wireless LAN access technology covers only 35m ~ 100m。 the 1888 invention of multiphase AC transmission and distribution system。 mobile wireless access technologies including: of WPANs, WLAN, e WiMAX, WWAN. In accordance with the bandwidth can be divided into narrowband wireless access and broadband wireless access. Representatives of which broadband wireless access technologies 3G, LMDS, WiMAX。英文翻譯英文文獻(xiàn)：The application prospects of wireless munication technology in the grid munication[Technical Analysis of the thesis Keywords ]wireless。 narrowband wireless access technology on behalf of firstand secondgeneration cellular mobile munication system.A major wireless munications technologyFrom technology trends can be seen as the core of the OFDM + MIMO wireless munications technology will bee the mainstream of the development direction of future wireless munications. The current wireless munications technology based on this technology are: four kinds of B3G, WiMAX, WiFi, of WMN and other technologies.Other wireless munications technologyIn addition to the mainstream wireless munications technology, wireless munication technology also includes: IrDA, Bluetooth, the RFID, UWB, cluster munications, and other shortrange munications technology and on LMDS, MMDS, and pointtopoint microwave, satellite munications, long distance munication technology.(1) the IrDA: Infrared Data Association, is a pointtopoint data transfer protocol, the munication distance is generally between 0 ~ 1m, the fastest transfer rates up to 16Mbps, the munication medium for the nearinfrared wavelengths around 900 nm.(2) Bluetooth: Bluetooth in the global open band using frequency hopping spread spectrum technology, the munication medium of electromagnetic waves from to .(3) of RFID: Radio Frequency Identification, ie, radio frequency identification, monly known as labels. It is a noncontact automatic identification technology, automatic target recognition by the RF signal and access to relevant data. RFID tags, Interpretation of three basic elements, and antenna.(4) the UWB: Ultra Wideband, UltraWideband technology. UWB munication is also known as carrierfree baseband munications, and is almost fully digital munications systems, RF and microwave devices need very little, so you can reduce the plexity of the system, reducingThe merits of wireless technology(A) WLAN technologyWiFi technologies and products are already quite mature, and mass production. The technology for the wireless LAN as an extension of wired networks, broadband applications for the particular location, even though the WiFi technology is widely used, but it is still in the security there is a certain security risk, the WiFi uses a radio frequency (RF ) through the air to send and receive data. Since wireless networks use radio waves to transmit data signals, are very vulnerable to attacks from outside hackers can easily steal data within the coverage of the waves and even into the unprotected internal LAN.(B) analysis of WiMaxWiMax is a stateoftheart technology, the introduction of relatively late, there are small frequency reuse, the use of the problem of low, but only recently standardized, largescale promotion of the technology also need to practice the test. From the application prospects of the technology can meet online in a wide range of requirements, coverage can include outdoor and indoor, can be a large area of ??coverage, or even a small number of base stations can be achieved throughout the city coverage. WiMax due to its advanced technology and ultralong transmission distance, has been the industry optimistic about the future direction of development of mobile technologies, and provides excellent last mile Internet access services.(C) of WMN technologyWMN is being studied in the technology, bined with the characteristics of the various technologies continue to study different aspects of integration and not a mature product line to support largescale application of this technology. The application prospects of WMN in this emerging network not only has a broad application space for wireless broadband access in other areas such as the bination of data, the image acquisition module can monitor or data acquisition of the target object, and is widely applied to detect and other fields. With the other technology is constantly updated sound of WMN better with integration of plementary, so as to be able to exceed and play their respective advantages.(D) 3G technical analysis3G 1996 standards, 2000 to plete the upperlayer protocols, including the plete formulation of standards. 3G network deployment with considerable practical experience, theory of a plete sets of building a network, including network link budget, the model budget and simulation. From the mercial prospects of 3G in some areas has been a largescale mercial applications, such as many European countries, Japan, Korea and so on have been building a 3G network. 3G technology has entered the practical stage, there are many countries and regions are under construction or will be building a 3G network.(5) on LMDS technical analysisLocal Multipoint Distribution business systems, LMDS is a pointtomultipoint fixed broadband wireless access technology, its oper