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What is digital radio dMR standards?

by xbdradios

As a professional wireless intercom communication tools, are widely used in all walks of life, it has an important role in national economic life. With the growing diversity of the increasing number of users intercom and user demand, the traditional analog radio frequency band utilization is low, mutual interference is more serious than a single business function and other problems have become increasingly prominent. Compared with traditional analog radio, digital radio has a strong anti-jamming capability, and high bandwidth efficiency. Interphone digitization is becoming a trend in the future development of the walkie-talkie, ESTI in recent years, the two sets of proposed DPMR and DMR digital radio standard, which currently sets the standard has become an international digital radio standard. China is also at the end of 2009, the Ministry issued a "Ministry of Industry and Information Technology 150MHz, 400MHz band dedicated walkie-talkie frequency planning and use management related issues notice" clearly the analog to digital timetable. According to chief engineer Wang Hua Anjie News talkie companies say: It is based on the above background, the communication protocol to DPMR standard digital radio with voice quality, easy to expand, and the use of communication protocol stack implemented in software with high flexibility, etc. . dPMR (digital Private Mobile Radio) is a digital radio standard ETSI organization disclosed. For commercial, professional, and public safety users of the application; dPMR use 6.25KHz FDMA technology, 4FSK modulation scheme, the data transfer rate of 4.8Kb / s. Based on this technology, the follow-up have been worked out NXDN, DCR and other standards. dPMR MoU was founded in 2007, is driven by the recognition and narrowband FDMA digital technology manufacturers, suppliers, end users and testing agencies and other components of a global organization, key members of the ICOM, KENWOOD, Hytera (Hytera) 12 family units. dPMR has completed standards ETSI TS 102 490 (Tier1), ETSI TS 102 658 (Tier2) and the like. dPMR uses FDMA technology to provide low-cost digital voice and data solutions, ETSI dPMR through the use of technology and 4FSK 6.25KHz FDMA modulation technique effectively reduces the channel spacing to improve the efficiency of spectrum use. NXDN is KENWOOD, ICOM digital radio standard jointly developed for the US market. NXDN Forum was founded in 2007, members of the unit has grown to 15; standard protocols were not disclosed. DCR is a digital radio standard ICOM, KENWOOD and other Japanese manufacturers, walkie-talkie market for digital business developed; complete standard ARIB STD-98. NDR (Narrow Digital Radio) narrowband digital radio standard by the DRA Union (digital radio enterprise standard alliance) is developing an open digital radio standard. Union by the intercom manufacturers, well-known universities, research institutions and other 24 members of the unit from the outstanding domestic components. Hytera (Hytera) as the Secretariat units DRA Alliance governing units, the overall group and technical team led alliance DRA unit leaders responsible for drafting standards, amendments submitted for review, promotion and other work. dPMR (digital Private Mobile Radio) is a digital radio standard ETSI organization disclosed. For commercial, professional, and public safety users of the application; dPMR use 6.25KHz FDMA technology, 4FSK modulation scheme, the data transfer rate of 4.8Kb / s. Based on this technology, the follow-up have been worked out NXDN, DCR and other standards. dPMR MoU was founded in 2007, is driven by the recognition and narrowband FDMA digital technology manufacturers, suppliers, end users and testing agencies and other components of a global organization, key members of the ICOM, KENWOOD, Hytera (Hytera) 12 family units. dPMR has completed standards ETSI TS 102 490 (Tier1), ETSI TS 102 658 (Tier2) and the like. dPMR uses FDMA technology to provide low-cost digital voice and data solutions, ETSI dPMR through the use of technology and 4FSK 6.25KHz FDMA modulation technique effectively reduces the channel spacing to improve the efficiency of spectrum use.






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