Repeaters How to Work

What is a repeater

A repeater is a radio communication relay device with the function of receiving and amplifying mobile phone network signals. It is mainly used in areas where the base station signal is too weak. It amplifies the base station signal and then transmits it to farther and wider areas, thereby expanding network coverage. scope.

Repeaters are an optimal solution to extend the coverage of communication networks. Compared with base stations, they have the advantages of simple structure, less investment, and easy installation. They can be widely used in blind areas and weak areas that are difficult to cover, such as shopping malls and airports. , stations, stadiums, subways, highways and other places to improve communication quality and solve problems such as dropped calls.

Working Principle

The basic function of a repeater is an RF signal power booster. The basic principle of its work is to use a forward antenna (donor antenna) to receive the downlink signal of the base station into the repeater, amplify the useful signal through a low-noise amplifier, suppress the noise signal in the signal, and improve the signal-to-noise ratio (S/N) ; Then it is down-converted to an intermediate frequency signal, filtered by a filter, amplified by the intermediate frequency, and then up-converted to radio frequency, amplified by a power amplifier, and transmitted to the mobile station by the backward antenna (retransmission antenna); at the same time, it is received by the backward antenna The uplink signal of the mobile station is processed by the uplink amplification link along the opposite path: that is, it passes through the low-noise amplifier, down-converter, filter, mid-amplifier, up-converter, and power amplifier and then is transmitted to the base station, thereby achieving the communication between the base station and the mobile station. Two-way communication.

Type of Repeater

（1）GSM mobile communication repeater

GSM repeater is a way to solve the problem of signal blind spots caused by base station coverage. Setting up repeaters can not only improve coverage, but also greatly reduce the cost of investing in base stations.

(2) CDMA mobile communication repeater station

CDMA repeater can eliminate local outdoor signal shadow areas in cities caused by the influence of high-rise buildings. CDMA repeaters can expand the coverage of CDMA base stations and greatly save investment in CDMA network construction.

(3) GSM/CDMA optical fiber repeater station

The fiber optic relay mobile communication repeater consists of two parts: a near-end machine close to the base station and a remote machine close to the coverage area. The optical fiber repeater has functions such as broadband, band selection, band selection, and frequency selection.

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