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Jan 03, 2018


GSM Digital Mobile communication system is designed by the standardization Committee of the main telecom operators and manufacturers in Europe, it is developed on the basis of honeycomb system. including Gsm900mhz, Gsm1800mhz and Gsm1900mhz and several frequency bands. GSM system has several important features: good anti-theft ability, large network capacity, rich number of resources, clear calls, stability is not easy to be disturbed, information sensitive, less dead, mobile phone power consumption is low.


CDMA (Code Division ListBox Access) is a new and mature wireless communication technology developed in the branch of digital technology-spread spectrum communication technology. It can meet the market demand for mobile communication capacity and quality, with a high frequency spectrum utilization, good voice quality, confidentiality, low rate, small electromagnetic radiation, large capacity, covering a wide range of characteristics, can greatly reduce investment and reduce operating costs.


Unimpressed is the third generation mobile communication technology, is the next generation mobile communication system generic term. 3G System is committed to providing users with better voice, text and data services. Compared with the existing technology, the main advantage of 3G technology is that it can greatly increase system capacity, improve communication quality and data transmission rate. In addition, the use of seamless roaming technology across different networks can connect wireless communication systems to the Internet to provide more advanced services for mobile end users.


CDMA mobile phone and GSM mobile phone, compared with the following advantages: CDMA mobile phones using advanced switching technology: Soft switching technology (that is, switching is first after a good after the interruption), so that the CDMA phone calls can be comparable to fixed telephone; using CDMA network, the operator's investment is relatively reduced, This has reserved the space for the reduction of CDMA mobile phone charges; Because of a kind of modulation and multiple access communication method based on the topological frequency communication, the capacity is 10 times times higher than the analog technology, and the GSM network is about 4 times times larger. CDMA based on wideband technology makes video application possible in mobile communication, So that mobile phones from only phone calls and send short messages and other narrow services to broadband multimedia applications.