distributed antenna system (small cell) (DAS)
A Distributed Antenna System(DAS) is a distributed antenna system for mobile networks consisting of several spatially distributed antennas supplied by one transmitter.
The distributed antennas form an antenna network and are used in small cells indoors (iDAS) in large buildings, exhibition halls or convention centers, but also outdoors (oDAS) in stadiums or airports. They provide radio coverage and supply individual rooms, halls or geographical areas.
The distributed antennas are supplied with low transmission power because, in contrast to an antenna with high transmission power, this causes less spurious emissions and interference. It also allows areas that are in the radio shadow to be broadcast and better line-of-sight connections to be established.
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DAS antenna systems can be built using passive splitters, cable splitters and repeaters. Equalizers can be used to balance the propagation times between the antennas, optimizing the overlap of the radio signals and thus improving the reception quality by means of time diversity.