Classification of repeater base stations
Classification of repeater base stations
repeater base stationThe transmission signals of mobile communication relay station types are divided into GSM repeater, CDMA repeater, WCDMA repeater, TD-SCDMA repeater and LTE repeater. From the installation site, it is divided into outdoor unit and indoor unit. From the transmission bandwidth, it is divided into broadband repeater and frequency selection (channel frequency selection) repeater. From the transmission mode, the repeater base station includes wireless repeater, optical fiber transmission repeater and frequency shift transmission repeater. Mobile communication repeater base station type GSM mobile communication repeater is a method to solve the signal blind area in the base station coverage. By installing repeaters, the coverage effect can be improved and the investment cost of the base station can be greatly reduced.
It is widely used in shopping malls, underground parking lots, subways, tunnels, high-rise buildings, offices, entertainment places, elevators or private residential base stations can not reach the signal blind area, while eliminating the city due to the impact of high-rise buildings and the outdoor local signal shadow area or remote individual township suburbs of weak signal area also has a good coverage effect.
CDMArepeater base stationIt is a relay device to eliminate the blind area or weak signal of mobile communication network coverage and expand the coverage of base station signal. It can solve the problem of eliminating the blind area of base station signal such as outdoor local signal shadow area, underground parking lot, underground tunnel, shopping mall, elevator and other base station signals affected by high-rise buildings in the city, so as to improve the coverage and enhance the signal coverage.
WCDMA repeater is a kind of relay equipment that can eliminate the blind area and weak signal coverage of mobile communication network and expand the signal coverage of repeater base station. It solves the problem of eliminating the shadow area of outdoor local signal signal caused by the influence of base stations such as urban high-rise buildings, underground parking lots, underground tunnels, shopping malls, elevators, etc. that cannot reach the signal blind area. Improve signal coverage and enhance signal coverage extension. The effect of microcell coverage was similar. Repeaters are designed to eliminate blind areas and weak signals in the coverage of mobile communication networks.
The optical fiber relay mobile communication repeater consists of two parts: the near end close to the repeater base station and the far end close to the coverage area. It is applicable to the construction of repeater base stations when the proposed repeater area of the base station is blocked by mountains or the distance between the two is far, and there is an optical cable between the base station and the coverage area. The optical fiber repeater has the functions of broadband, band selection, band selection and frequency selection. Transmission range up to 20km. Because the spatial isolation is good and there is no co-channel interference, the omnidirectional antenna may be used to cover the retransmission direction, thereby improving the coverage effect. Other systems may also consist of wavelength division multiplexing (WDM), fiber optic repeaters (fiber optic repeaters).
The composition of mobile communication repeaters varies from type to type. wireless repeater downlink receptionrepeater base stationThe signal sent is amplified and covered in the direction of the user; the uplink receives the signal sent by the user and sends it to the repeater base station after amplification. To limit the bandwidth, a band-pass filter is added. In order to select the frequency, the frequency-selective repeater converts the up-down frequency to the intermediate frequency, and restores the up-down frequency after frequency selection and band-limiting processing. The signal received by the optical fiber transmission repeater is converted into an optical signal through photoelectric conversion. After transmission, the electrical signal is restored through photoelectric conversion and then sent out.