What is external GSM antenna

Technical features GSM antenna: 1. spectrum efficiency. Thanks to a highly efficient modulator, channel coding,

interleaving, equalization and voice coding technology, the system has high spectral efficiency. 2. capacity. Since

each channel bandwidth increases, the same frequency reuse plant dry lower than required to 9dB, so the GSM system

with frequency reuse pattern can be reduced to 4/12 or 3/9 or even smaller; plus half rate speech coding

introduction and automatic call distribution to reduce the number of handover, so that the efficiency of the GSM

system capacity than TACS system is three to five times higher. 3. voice quality. Given the characteristics of

digital transmission technology and the definition of the relevant GSM air interface specification and voice

coding, when above the threshold value, the voice quality is always reached regardless of the wireless transmission

quality at the same level. The open interfaces. GSM standards provide open interfaces, it is not limited to the air

interface, and newspapers as well as direct network between the devices in the network entity, such as the A

interface and Abis interface. 5. safety. By using authentication, encryption and TMSI numbers, for security

reasons. Authentication is used to verify the user's network rights. Encryption is used for the air interface is

determined by the SIM card and network AUC key. TMSI is a business network for the temporary identification number

specified by the user, in order to prevent people from tracking and leak its location. 6. With ISDN, PSTN and other

interconnections. Interconnection with other networks typically use existing interfaces, such as ISUP or TUP like.

7. Implementing roaming SIM card basis. Roaming is an important feature of mobile communication, it marks the user

can automatically from one network to another. GSM antenna system can provide global roaming, of course, requires

some agreement between network operators, such as billing.



GSM antenna includes GSM 900: 900MHz, GSM1800: 1800MHz and GSM1900: 1900MHz, and several other bands. GSM antenna

is a widely used in Europe and other parts of the world, digital mobile phone system. GSM antenna using a variant

of TDMA, and it is currently three digital wireless telephone technologies most widely used one. GSM antenna will

digitize, and compress the data, and then transmitted from the channel together with the other two user data

stream, the other two user data stream has its own time slot. GSM antenna is actually a wireless telephone standard

in Europe, according to the GSM MoU Joint Committee report, GSM antenna in the world has 12 million users, and

users in over 120 countries. Because many GSM antenna network operators have roaming agreements with other foreign

operators, so when a user to another country, you can still continue to use their mobile phones.


GSM antenna and other wireless technology is the evolution of mobile communication, wireless mobile communication

include high-speed circuit switched data, general packet radio systems, GSM antenna-based data network enhanced

mobile communications technology and Universal Mobile Telecommunications Service has several important features:

anti-theft copy good capability, network capacity, abundant resources phone number, call clear, strong stability

less susceptible to interference, sensitive information, call less dead, low power consumption mobile phone.