Solution

Large buildings such as shopping malls, entertainment centers and hospitals can not be covered by outdoor base stations because of their large building area and large internal spacing. Signal coverage must be achieved by constructing MDAS indoor antenna distribution systems within buildings.

The MDAS multi-mode digital optical fiber distribution system is the first choice for building a large-scale Indoor distribution system. The MDAS system consists of three parts: the main unit MU, the expended unit EU, and the remote unit RU. The main MU coupled base station, RRU RF output, converts RF signals into digital optical signals and transmits them in four separate ways via fiber optics to four expended units, the EU.Each expended EU then transmits the digital optical signal in eight ways via fiber optics to eight remote- unit RUs.The remote unit RU processes digital signals into RF signals, amplifies them and outputs them to the antenna for coverage.

The solution for weak indoor signal in small households is generally weak for areas with relatively complex indoor structures, far from windows, and basement mobile phone signals. And the outdoor signal is good. A 7D-FB coaxial cable can be used to connect the receiving antenna and the amplifier host. An omnidirectional coverage antenna is installed in the center every 100 square meters indoors. At the output port of the amplifier, a 7D-FB coaxial cable is used to connect the power divider or coupler to distribute the signal output by the amplifier and connect it to the coverage antenna.

Amplitec's C20L series mobile signal amplifier is a very low-cost solution. The C20L series is available in single frequency, dual frequency, tri frequency, and multi frequency models.

Due to the large building area and multiple internal intervals, the coverage of large high-rise buildings results in significant attenuation of wireless signals, making it impossible to use outdoor macro base stations to achieve internal coverage. Therefore, Signal coverage must be achieved by constructing high-power repeaters & indoor antenna distributed systems within buildings.

Select a high gain planar antenna as the receiving antenna and install it on the wall on the rooftop where the base station tower is visible or in the direction of strong signal testing using mobile software; Connect the receiving antenna to the repeater station using a 1/2 feeder line no longer than 50 meters in length;

Tunnels are diverse. Divided into highway tunnels and subway tunnels according to their purposes.  Different functional tunnels have different requirements for signal coverage. According to the tunnel's structure, it can be divided into curved, straight, long, and short. Tunnels of different structures also have different signal coverage.

In  general, the use of highway or rail tunnels for calling or the Internet accessing is not very high.Outdoor base station signals can be extended to achieve signal coverage.Take the example of a 5km straight road tunnel.a set of 10W air-coupled fiber optic repeater with 1 pcs local unit and 5 pcs of remote units is adopted.A high-gain outdoor plate antenna is installed at the mouth of the tunnel to receive the signal from the base station

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In many villages located in mountainous areas, the signal in the villages is very weak due to the obstruction of hillsides and forests, and the cost of adding base stations or using optical fiber remote solutions is high and difficult to construct. High-power wireless repeaters are used to solve the problem in mountain villages. The signal coverage is the most economical and quickest solution.

Choose a high-gain parabolic antenna as the receiving antenna, and install it  on the hillside where the base station tower can be seen; install the high-power outdoor wireless repeater on the top of the hillside, and use a 1/2 feeder not exceeding 50 meters long to connect the receiving antenna With the repeater

Operators deploy fewer base stations in rural areas.The signal is vulnerable to significant attenuation due to terrain impact, and the vehicle body will also attenuate the base station signal by 15~20dB. If the vehicle is driving in the suburbs and the base station signal received in the vehicle is lower than -105dBm, mobile phones in the car will not work normally. Installing car amplifiers can improve in-vehicle signals even when the vehicle is traveling in an area where the base station signal is weak (In the area where there is no signal at all, even if it is installed, the signal in the car cannot be improved)

The main unit of the car amplifier is usually fixed under the passenger seat, and the car omnidirectional antenna with magnet base is mounted on the metal part of the car roof as the receiving antenna.