US 11,838,072 B2
Techniques for accurate cable loss measurement
Cheng Tan, Denver, CO (US); Lei Sun, Irvine, CA (US); Sean Vincent Maschue, Encinitas, CA (US); Bruce Charles Fischer, Jr., Lafayette, CO (US); and Brian French, Boulder, CO (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Sep. 27, 2021, as Appl. No. 17/486,745.
Prior Publication US 2023/0098404 A1, Mar. 30, 2023
Int. Cl. H04B 3/48 (2015.01); H03F 3/24 (2006.01)
CPC H04B 3/48 (2013.01) [H03F 3/245 (2013.01); H03F 2200/451 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method for determining cable loss performed by a signal compensator device of an apparatus, comprising:
sending, to a radio modem of the apparatus, a request for the radio modem to use a target power when sending one or more signals to the signal compensator device for determining a cable loss associated with a transmission cable communicatively coupling the radio modem with the signal compensator device;
receiving, at the signal compensator device, the one or more signals from the radio modem sent using the target power, wherein:
the one or more signals are received by the signal compensator device at an input power, and
the input power comprises the target power reduced according to the cable loss associated with the transmission cable;
determining a first target gain value for amplifying the input power of the signal compensator device, wherein the first target gain value is subject to a first maximum gain value;
amplifying the input power of the one or more signals received at the signal compensator device according to the determined first target gain value to generate a first output power of the signal compensator device;
determining whether the first output power of the signal compensator device is greater than or equal to a minimum output power;
determining, when the first output power of the signal compensator device is not greater than or equal to the minimum output power, a second target gain value for amplifying the input power of the signal compensator device, wherein the second target gain value is subject to a second maximum gain value greater than the first maximum gain value;
amplifying, when the first output power of the signal compensator device is not greater than or equal to the minimum output power, the input power of the one or more signals received at the signal compensator device according to the determined second target gain value to generate a second output power of the signal compensator device; and
determining the cable loss associated with the transmission cable based on the one or more signals.