Patent ID: 11923905
Assignee: COMBA NETWORK SYSTEMS COMPANY LIMITED
Field: Telecommunications (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 13:
14. A signal transmission method, wherein: the signal transmission method is applied to a distributed antenna system; the distributed antenna system includes: at least two digital-analog expansion units and at least two remote cascade chains, each of the at least two digital-analog expansion units being connected to at least one of the at least two remote cascade chains respectively, each of the remote cascade chains including a plurality of remote units cascadingly connected by means of radio frequency cable, and each of the at least two digital-analog expansion units including a radio frequency front end module connected to a first remote unit of the plurality of remote units of a respective remote cascade chain of the at least two remote cascade chains by means of radio frequency cable; and
the signal transmission method includes:
performing, by the digital-analog expansion unit, baseband processing and digital-to-analog conversion on a downlink digital radio frequency signal transmitted by a source unit through an optical fiber, to obtain a downlink analog radio frequency signal, and transmitting the downlink analog radio frequency signal to the remote cascade chain; and
acquiring, by the remote unit, the downlink analog radio frequency signal, and performing downlink radio frequency signal transmission based on the downlink analog radio frequency signal.