In addition to the establishment of communication towers by operators, the mobile phone communication problem can be solved by installing mobile phone signal amplifiers, wireless repeaters and digital fiber repeaters if there is no mobile phone signal. First of all, a base station is a public mobile communication base station, also known as a public network, which is an interface device for mobile devices to access the Internet, and is also a form of radio station. Cell phone signal amplifiers and repeaters, digital fiber repeaters are composed of antennas, RF duplexers, low noise amplifiers, mixers, ESC attenuators, combiners, filters, power amplifiers and other components or modules. composition, including uplink and downlink amplification links, fiber jumpers, etc.
The working principle of a base station is a radio transceiver station that transmits information with a mobile phone terminal through a mobile communication switching center in a certain radio coverage area. Mobile phone signal amplifiers, wireless repeaters and digital fiber repeaters use the receiving antenna (donor antenna) to receive the downlink signal of the base station into the repeater amplifier, and amplify the useful signal through the low-noise amplifier to suppress the noise signal in the signal. Improve the signal-to-noise ratio (S/N); then down-converted to the intermediate frequency signal, filtered by a filter, amplified at the intermediate frequency, and then frequency-shifted and up-converted to the radio frequency, amplified by the power amplifier, and transmitted by the transmitting antenna (retransmission antenna). Mobile stations, mobile terminals, etc., to ensure communication requirements, achieve the purpose of signal blind area coverage, and thus solve the signal requirements.