Patent ID: 11863145
Assignee: APPLIED OPTOELECTRONICS, INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. An automatic gain control (AGC) system for controlling gain in an RF line extender amplifier in a hybrid fiber-coaxial (HFC) network, the AGC system comprising:
a wideband RF tuner configured to receive an output downstream RF signal from the RF amplifier and to select at least first and second pilot channels from a sample of the downstream RF signal, wherein the downstream RF signal has a wideband spectrum of up to 1.8 GHz, wherein the first channel is located in a lower frequency range of the wideband spectrum, and wherein the second channel is located in an upper frequency range of the wideband spectrum;
a power detector circuit for measuring power of the selected at least first and second pilot channels; and
a controller configured to determine a correction based on the measured power of the at least first and second pilot channels and to provide a control voltage or voltages to RF amplifier based on the correction for automatic gain control.