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

Claim 0:
1. A distributed antenna system, comprising: 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 at least two 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;
wherein each of the at least two digital-analog expansion units is configured to perform, through a first baseband processing module inside the digital-analog expansion unit, a baseband processing operation on a downlink digital radio frequency signal transmitted by a source unit through an optical fiber, and perform digital-to-analog conversion through a first signal conversion module inside the digital-analog expansion unit, to obtain a downlink analog radio frequency signal to be transmitted to the respective remote cascade chain; or the digital-analog expansion unit is configured to perform, through the first signal conversion module, analog-to-digital conversion on an uplink analog radio frequency signal transmitted by the respective remote cascade chain, and perform a baseband processing operation through the first baseband processing module, to obtain an uplink digital radio frequency signal to be transmitted to the source unit through an optical fiber; and
wherein the remote unit is configured to perform analog radio frequency signal interaction with a terminal device, and two adjacent ones of the remote units performing analog radio frequency signal interaction by means of the radio frequency cable.