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

Claim 11:
12. 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:
acquiring, by the remote unit, a first uplink analog radio frequency signal of a terminal device and a second uplink analog radio frequency signal transmitted by a lower-stage remote unit;
combining, by the remote unit, the first uplink analog radio frequency signal with the second uplink analog radio frequency signal to obtain an uplink analog radio frequency signal of a current remote unit, and transmitting the uplink analog radio frequency signal of the current remote unit to an upper-stage remote unit or the digital-analog expansion unit; and
performing, by the digital-analog expansion unit, analog-to-digital conversion and baseband processing on the acquired uplink analog radio frequency signal, to obtain an uplink digital radio frequency signal to be transmitted to the source unit through an optical fiber.