subject: The Image Can Make Us Understand What Kind Of Sfp Problem [print this page] Different communication systems because of their technical maturity and technical characteristics of their different sensitivity for different levels of the Doppler effect. 2G 3G business, the business is relatively less affected by the Doppler effect. In the 3G business, TDD mode TD-SCDMA system by more than doppler effect larger.Switched cellular mobile communication system is the technical features for mobile users with continuous uninterrupted communications services. However, the switch is take some time to complete, otherwise it would cause dropped calls or data service interruption. Therefore, high-speed railway environment,in the region to meet the long-distance switching signal overlapping coverage to meet the requirements of switching time. On the other hand, also used in the network deployment RRU or SFP repeater to extend the logic of the base station as far as possible to reduce the switching frequency and quantity and improving the stability of communication Sex.
We believe that the quality of wireless coverage to improve the one hand, high-speed rail along the railway station needs to optimize the system configuration. SFP stable and reliable high-performance repeater system with the base station wireless coverage in Europe, North America and other regions of the high-speed railway successful application.At the same time, mature and stable vehicle wireless signal distribution system is to improve the quality of high-speed railway wireless coverage necessary choice. Andrew's car repeater systems and products in the world, including China's Beijing-Tianjin high-speed railway has been successfully applied. andrew has successfully launched in 2010 a new generation of car repeater product line NodeAM, small volume, high degree of integration, all-digital, performance and stability characteristics, can support multi-carrier independent, multi-technology system, the system simultaneously , Head before the start of high-speed trains in Europe, install and use. Mainland China is very suitable for the existing multi-technology multi-system operators and system operation mode, small size, small changes in body installation, reliable performance, easy maintenance, user friendly interface."Communications World Weekly": network operators, optimization should be more attention to what the new technology?
High-speed rail in particular 3G wireless coverage coverage, along with the base station in the matching set, such as antennas, cables, etc., which raised more than conventional rail more demanding requirements?Andrew Liu Bin: The wireless coverage is a high-speed railway running trains for high speed wireless coverage, with the traditional ground and indoor wireless coverage is very different. On the one hand, the wireless signal the body to cope with the decline of the insertion loss caused by the other party hand, to cope with the rapid movement of mobile users switching requirements. And 3G data services business, mostly on the wireless network coverage with higher quality and stability requirements. Therefore, the characteristics of high-speed railway for wireless coverage consideration.
As a high-speed rail along the train radio base station equipment covering the information source, it is necessary to meet the quality of radio signals along the railway but also to minimize the high-speed mobile user's cell switch. Therefore, the base station to set the base station when it is necessary to shorten the distance between the transmitter unit to meet the base station firing units within range of the signal quality, but also try to extend the logic to reduce the distance between the base station switching. Therefore, usually with high quality and reliability of the RRU and the SFP to match the base station repeater system common wireless coverage.
