gsm、cdma和3g比较（Comparison of GSM, CDMA and 3G）.docVIP

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gsm、cdma和3g比较（Comparison of GSM, CDMA and 3G）.doc

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gsm、cdma和3g比较（Comparison of GSM, CDMA and 3G）

gsm、cdma和3g比较（Comparison of GSM, CDMA and 3G） GSM digital mobile communication system is designed by the Standardization Committee of European major telecom operators and manufacturers. It is developed on the basis of the cellular system. Including GSM900MHz, GSM1800MHz and GSM1900MHz and so on several frequency bands. GSM system has several important features: good anti-theft ability, large network capacity, rich number of resources, clear call, strong stability, not easily disturbed, sensitive information, few dead calls, mobile phone power consumption and so on. CDMA is the abbreviation of Access (Code Division Multiple), which is a new and mature wireless communication technology developed on the branch of digital technology spread spectrum communication technology. It can meet the market requirements of high capacity and quality of mobile communication, has the advantage of high spectrum efficiency and good speech quality, high security, low drop rate, small electromagnetic radiation, large capacity, wide coverage and other characteristics, can reduce the amount of investment and reduce operating costs. 3G is the third generation mobile communication technology, and is the general term of the next generation mobile communication system. The 3G system aims to provide 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 the system capacity, improve communication quality and data transmission rate. In addition, seamless roaming technology between different networks can be used to connect wireless communication systems with Internet, so as to provide more and more advanced services to mobile terminal users. Compared to the CDMA mobile phone and GSM mobile phone, CDMA mobile phone has the following advantages: CDMA mobile phone using the switching technique advanced: soft switching technology (i.e. switching is the first connection after interruption), the CDMA mob