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

Claim 16:
17. A gain control apparatus, wherein: the gain control apparatus is applied to a distributed antenna system; the distributed antenna system includes: a digital-analog expansion unit and a remote cascade chain, the remote cascade chain including a plurality of remote units cascadingly connected by means of radio frequency cable, and a first remote unit of the remote cascade chain being connected to the digital-analog expansion unit by means of radio frequency cable; the gain control apparatus is arranged in each of the remote units; and
the gain control apparatus includes:
a power measurement module configured to acquire a radio frequency signal transmitted by the digital-analog expansion unit by means of radio frequency cable, and measure the radio frequency signal, to obtain a first power value, wherein the radio frequency signal is a signal generated by the digital-analog expansion unit according to a preset frequency band and a preset power value;
a cable length acquisition module configured to obtain a radio frequency signal insertion loss based on the first power value and the preset power value, and obtain a cable length according to the radio frequency signal insertion loss and the preset frequency band; and
an attenuation value matching module configured to obtain a target signal insertion loss based on the cable length and a target signal frequency band, and match an attenuation value of a digital control attenuator based on the target signal insertion loss, target transmitting power and a gain value.