Multi-frequency-band digital distributed antenna system

Abstract

The invention discloses a multi-frequency-band digital distributed antenna system used for realizing communication between a mobile communication base station and a mobile client. The system comprises a near-end unit and a far-end unit connected and communicating with each other, the near-end unit is connected and communicates with the mobile communication base station, and the far-end unit is connected and communicates with the mobile client; in a downlink, downlink signals are coupled to the near-end unit from the mobile communication base station and converted to analog intermediate frequency signals in the near-end unit, the analog intermediate frequency signals are converted to digital signals, the digital signals are outputted and transmitted to the far-end unit from the near-end unit and converted to the analog intermediate signals in the far-end unit, and the analog intermediate frequency signals are converted to radiofrequency signals and transmitted to the mobile client in a coverage via an antenna of the far-end unit after power amplification; and in an uplink, the signals from the mobile client are received by the antenna of the far-end unit and transmitted to the mobile communication base station via an inverse process of the downlink.

Description

technical field [0001] The present invention relates to the indoor coverage technology of the mobile communication system, and more specifically relates to a multi-band digital distributed antenna system. Background technique [0002] With the development of mobile communication technology, communication frequency bands and operators are gradually increasing with the development of business. There are more and more cases where one operator uses multiple communication frequency bands or multiple operators use different communication frequency bands to cover certain areas. When using the repeater as indoor and outdoor 1-to-N remote coverage, if the existing single-band optical fiber repeater equipment is used, multiple communication frequency bands must be used to cover a certain area at the same time. Equipment, cost and installation are more complicated. If the form of BBU+RRU is used for coverage, since the RRU can basically only support single frequency, the cost will inc...

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Problems solved by technology

In terms of coverage, due to the shielding and absorption of the building itself, it causes a large propagation loss of radio waves, forming a weak field strength area or even a blind area of ​​the mobile signal; in terms of capacity, buildings such as large shopping malls and conference centers, due to mobile The density of telephone use is too high, the local network capacity cannot meet the needs of users, and wireless channel congestion occurs; in terms of quality, radio frequency interference is very likely to exist in the high-rise space of buildings, the signal of the service cell is unstable, and ping-pong switching effects occur, and the voice quality is difficult to guarantee. and dropped calls

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