GSM (Global System for Mobile) micropower distribution system

Abstract

The invention relates to a GSM (Global System for Mobile) micropower distribution system. The system is characterized by comprising an expansion unit, a far-end radio unit and a monitoring circuit which are connected through a common antenna television (CATV) cable, wherein the expansion unit comprises an upstream upper variable frequency circuit, a downstream lower variable frequency circuit, anindependent reference local vibration source, a power circuit, a radio receiving-transmitting circuit and a feed shunting unit; the far-end radio unit comprises an upstream low-noise power amplification circuit, an upstream lower variable frequency circuit, a downstream upper variable frequency circuit, a downstream power amplification circuit, a feed combining unit, a radio receiving-transmitting circuit and a CATV cable connecting the expansion unit with the far-end radio antenna unit; and the monitoring circuit is used for monitoring the expansion unit and the far-end radio unit. In the system, the expansion unit is connected with the far-end radio unit through the CATV cable and can support signal transmission of 0-275m. The system has simple structure, low cost and wide market.

Description

technical field [0001] The invention relates to a mobile communication device, in particular to a GSM micro power distribution system. Background technique [0002] With the rapid increase of mobile communication users, the indoor communication requirements of mobile users are getting higher and higher, and the problem of improving the signal coverage quality of mobile communication networks in buildings is becoming more and more prominent. Due to the influence of buildings in modern cities, after the signals of different base stations enter the room through direct radiation, refraction, reflection, diffraction, etc., the indoor signal is unstable and unstable, and the same-frequency and adjacent-frequency interference is serious, resulting in the mobile network. The cell reselection is frequent when the mobile phone terminal is not in a call, and the cell is switched frequently during a call, the voice quality is poor, and the call drop phenomenon is serious. [0003] In o...

AI Technical Summary

Problems solved by technology

Due to the influence of buildings in modern cities, after the signals of different base stations enter the room through direct radiation, refraction, reflection, diffraction, etc., the indoor signal is unstable and unstable, and the same-frequency and adjacent-frequency interference is serious, resulting in the mobile network. Cell phone terminals frequently reselect cells when they are not in a call, frequently switch during a call, the voice quality is poor, and call drops are serious

[0003] In order to improve the indoor communication effect of the mobile communication network, people have adopted a large number of coaxial cables as the transmission medium and the method of directly amplifying the radio frequency signal of the base station to solve the problem of indoor signal coverage. For indoor coverage, high-power base stations are generally used as signal sources, and trunk amplifiers are used to compensate for the loss of coaxial cables to RF signals, which makes noise introduction serious, especially the noise of uplink signals

The introduction of uplink signal noise will directly affect the receiving sensitivity and coverage of the base station, and reduce the user capacity of the system; at the same time, the loss of coaxial cables will increase power consumption, the base station cannot be placed at a long distance, and the construction of a large number of coaxial cables is difficult. very prominent

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