| 摘要 |
A distributed antenna system includes a plurality of remote units configured to service different regions of a service area, and a head-end unit configured to process and transmit downlink signals from base stations to the remote units over optical cables, and to process and transmit uplink signals from the remote units to the base stations, wherein the remote units are configured to adjust or filter a level of downlink signals from the head-end unit and to transmit the adjusted or filtered downlink signals to mobile stations, and to process and transmit uplink signals from mobile stations to the head-end unit over the optical cables.
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