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May 24, 2017

GSM antenna technical characteristics: 1. Spectrum efficiency. Due to the use of efficient modulators, channel coding, interleaving, equalization and speech coding techniques, the system has high spectral efficiency. 2. capacity. As the transmission bandwidth of each channel increases, so that the same frequency reuse ratio is reduced to 9dB, so the GSM system with the same frequency reuse mode can be reduced to 4/12 or 3/9 or even smaller; plus half rate voice coding Of the introduction and automatic traffic allocation to reduce the number of handoffs, the GSM system capacity efficiency than the TACS system 3 to 5 times higher. 3. Voice quality. In view of the characteristics of digital transmission technology and the definition of air interface and voice coding in the GSM specification, above the threshold, the voice quality always reaches the same level regardless of the quality of wireless transmission. 4. Open interface. The open interface provided by the GSM standard is not limited to the air interface, but also the network of newspapers and networks directly between the device entities, such as the A interface and the Abis interface. 5. Security. Through the use of authentication, encryption and TMSI numbers, to achieve the purpose of security. Authentication is used to verify the user's access rights. Encryption for air interface, by the SIM card and network AUC key decision. TMSI is a temporary identification number assigned to the user by the service network to prevent someone from tracking and leaking their geographical location. 6. Interconnection with ISDN, PSTN, etc. Interconnection with other networks usually uses existing interfaces such as ISUP or TUP. 7. Roaming based on SIM card. Roaming is an important feature of mobile communication, it marks the user can automatically enter a network from another network. The GSM antenna system can provide global roaming, and of course some of the protocols between network operators, such as billing.


GSM antennas include GSM 900: 900MHz, GSM1800: 1800MHz and GSM1900: 1900MHz and other frequency bands. GSM antenna is a widely used in Europe and the rest of the world's digital mobile phone system. The GSM antenna uses a time division multiple access variant, and it is the most widely used in the three digital radiotelephone technologies. The GSM antenna digitizes the data and compresses the data, and then sends it out of the channel with the other two user streams, and the other two user streams have their own time slots. GSM antenna is actually the European standard for wireless telephony, according to GSM MoU Joint Committee reported that GSM antenna in the world has 1.2 billion users, and users in more than 120 countries. Because many GSM antenna network operators have roaming agreements with other foreign operators, they can continue to use their mobile phones when they go to other countries


GSM antenna and other technologies are the evolution of wireless mobile communication. Wireless mobile communication includes high-speed circuit-switched data, universal wireless packet system, data-enhanced mobile communication technology based on GSM antenna network and universal mobile communication service. Ability, network capacity, mobile phone number is rich in resources, call clear, strong stability is not susceptible to interference, information sensitive, call dead end less, low power consumption of mobile phones.