In order to meet people's growing business needs, scholars from various countries have proposed many technologies to improve signal quality, increase system capacity, and expand signal coverage. The distributed antenna system (DAS) is one of the major technologies and is expected to be one of the solutions for the next generation of high-speed data transmission.
DAS Antennas refers to the arrangement of one or more antennas in a "logical cell" (group) to serve the user at the same time, the downlink transmits the same signal to the user at the same time, and the uplink multiple antennas receive it at the same time and send it back to the processing center for processing. The antenna side is as simple as possible to reduce costs, except for the basic parts, the processing of the signal is concentrated in the processing center.
The advantages of Antennas are as follows:
lThe remote radio port is simple and low-cost, and the low-power transmission of the remote radio port can reduce mutual channel interference;
lAdapt to various multiple access modes (FDMA, TDMA, CDMA) and different technical standards (2G, 3G, W-iFi, WiMAX);
lDAS achieves good uniform coverage of the service area and improves performance
lMacro diversity can be achieved through the reception of antennas at multiple different locations to resist shadow fading;
lResource management is more flexible, and the processing center can achieve unified and dynamic allocation of resources, optimize resource use, and greatly improve spectrum efficiency;
lDifferent forms of business needs can be met, making heavy network planning work easier.
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