# US 12,003,280 B2 · Analog domain loopback modes > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,003,280 B2 - Document ID: US12003280B2 - Status: Granted - Kind: B2 - Application number: 17/660,353 - Filed: 2022-04-22 - Published: 2023-10-26 - Granted: 2024-06-04 - Earliest claimed: 2022-04-22 - Assignees: Dell Products L.P. - Applicants: Dell Products L.P. - Inventors: Danyi Rong; John Bradley Deforge; Tommy Ivarsson; Sewvanda Don - Web page: https://patentgrep.com/patent/US12003280B2 ## CPC - H04B 1/0475: {with means for limiting noise, interference or distortion (H04B1/0483 takes precedence)} - H04B 17/14: of the whole transmission and reception path, e.g. self-test loop-back - H04B 1/0466: {Fault detection or indication (H04B1/0483 takes precedence)} - H04B 1/10: Means associated with receiver for limiting or suppressing noise or interference - H04B 17/19: Self-testing arrangements - H04B 17/29: Performance testing - H04B: TRANSMISSION ## Abstract A system can comprise a radio unit comprising a transmitter, a receiver, and a power amplifier. The system can further comprise a hardware loopback that communicatively couples the transmitter and the receiver via an analog section of the radio unit, wherein the hardware loopback is selected at a component disposed between the transmitter and the power amplifier. The system can further comprise a hardware component that is configured to transmit a signal from the transmitter to the receiver via the hardware loopback. ## Claims ### Claim 1 A system, comprising: a radio unit comprising a transmitter, a receiver, and a power amplifier; a hardware loopback that communicatively couples the transmitter and the receiver via an analog section of the radio unit, wherein the hardware loopback is selected at a component disposed between the transmitter and the power amplifier; and a hardware component that is configured to transmit a first signal from the transmitter to the receiver via the hardware loopback, and to inject a second signal into a signal chain of the radio unit, wherein the first signal is received at the transmitter before transmitting the first signal to the receiver, wherein the second signal comprises a custom signal that is generated by the system, wherein the signal chain is configured to transmit signals from the transmitter to the receiver, wherein the first signal comprises mission mode data, wherein the second signal comprises custom data, and wherein the hardware component is configured to multiplex the first signal and the second signal. ### Claim 2 (depends on 1) The system of claim 1, wherein the hardware component is a first hardware component, and further comprising: a second hardware component that is configured to capture frequency domain data from a digital front end block of the radio unit, wherein the frequency domain data is based on the signal. ### Claim 3 (depends on 1) The system of claim 1, wherein the hardware component is a first hardware component, and further comprising: a second hardware component that is configured to capture time domain data from a digital front end block of the radio unit, wherein the time domain data is based on the signal. ### Claim 4 (depends on 1) The system of claim 1, wherein the hardware component is a first hardware component, and further comprising: a second hardware component that is configured to compare the signal received at the receiver via the hardware loopback with historical performance data. ### Claim 5 (depends on 4) The system of claim 4, wherein comparing the signal with the historical performance data produces compared data, and wherein the second hardware component is configured to analyze the compared data to determine a health of the radio unit, an aging of the radio unit, a soft fail of the radio unit, a no fault found of the radio unit, or a diagnostic data of the radio unit. ### Claim 6 (depends on 1) The system of claim 1, wherein the hardware component is a first hardware component, and further comprising: a second hardware component that is configured to capture the signal received at the receiver via the hardware loopback to produce a captured signal, and analyze the captured signal to determine a performance metric. ### Claim 7 (depends on 6) The system of claim 6, wherein the second hardware component is configured to store the performance metric in a database that is local to the radio unit. ### Claim 8 (depends on 1) The system of claim 1, wherein the custom signal is generated at a radio unit of the system, at a distributed unit of the system, or at a central unit of the system. ### Claim 9 A method, comprising: selecting, by a system comprising a processor, to route an analog signal from a transmitter of a radio to a receiver of the radio via an analog loopback of the radio at a hardware component positioned between the transmitter and a power amplifier of the radio; transmitting, by the system, the analog signal via the analog loopback; injecting, by the system, a second signal into the analog loopback, wherein the second signal comprises a custom signal that is generated by the system, wherein the analog loopback is configured to transmit signals from the transmitter to the receiver, wherein the first signal comprises mission mode data, wherein the second signal comprises custom data, and wherein the system is configured to multiplex the first signal and the second signal; and capturing, by the system, the analog signal and the second signal received at the receiver. ### Claim 10 (depends on 9) The method of claim 9, wherein the analog signal received at the receiver comprises down link signal data, and further comprising: multiplexing, by the system, the analog signal to an up link path of the radio via an analog signal tap and injection point. ### Claim 11 (depends on 9) The method of claim 9, wherein the analog signal received at the receiver comprises an antenna calibration port signal, and further comprising: calibrating, by the system, a down link antenna of the radio based on the analog signal. ### Claim 12 (depends on 9) The method of claim 9, wherein the analog signal received at the receiver comprises an antenna calibration port signal, and further comprising: calibrating, by the system, an up link antenna of the radio based on the analog signal. ### Claim 13 (depends on 9) The method of claim 9, wherein capturing the analog signal produces a captured signal, and further comprising: determining, by the system, a voltage standing wave ratio of the radio based on the captured signal. ### Claim 14 (depends on 9) The method of claim 9, wherein the custom signal is generated at a radio unit of the system, at a distributed unit of the system, or at a central unit of the system. ### Claim 15 An apparatus, comprising: a loopback component that is configured to transmit an analog signal from a transmitter of a radio to a receiver of the radio via an analog loopback of the radio, wherein the loopback component is configured to receive a custom signal that is generated by the apparatus and transmit the custom signal to the receiver; a selector component that is configured to access the loopback component, wherein the selector component is positioned between the transmitter and a power amplifier of the radio; and a capture component that is configured to capture the analog signal and the custom signal received at the receiver, wherein the analog signal comprises mission mode data, wherein the custom signal comprises custom data, and wherein the apparatus is configured to multiplex the analog signal and the custom signal. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the analog signal is originated from a radio unit of the radio or a distributed unit of the radio. ### Claim 17 (depends on 15) The apparatus of claim 15, wherein the analog signal is originated from a hybrid of a radio unit of the radio and a distributed unit of the radio. ### Claim 18 (depends on 15) The apparatus of claim 15, wherein the capture component is configured to capture the analog signal to produce a captured signal, wherein the capture component is part of a radio unit of the radio or a distributed unit of the radio, and wherein the capture component is configured to analyze the captured signal. ### Claim 19 (depends on 15) The apparatus of claim 15, wherein the capture component is configured to capture the analog signal to produce a captured signal, wherein the capture component is part of a hybrid of a radio unit of the radio and a distributed unit of the radio, and wherein the capture component is configured to analyze the captured signal. ### Claim 20 (depends on 15) The apparatus of claim 15, wherein the capture component is configured to capture the analog signal to produce a captured signal, wherein the capture component is part of a central unit of the radio, and wherein the capture component is configured to analyze the captured signal.