A radar unit (100, 300) is described that comprises: a frequency generation circuit (103, 106, 303, 306) configured to generate a millimetre wave, mmW, frequency modulated continuous wave, FMCW, transmit signal comprising a plurality of chirps; a transmitter circuit (108, 102, 308, 302) configured to transmit the generated mmW FMCW transmit signal: a receiver circuit (104, 110, 304, 310) configured to receive an echo of the mmW FMCW transmit signal; and a built-in self-test, BIST, circuit (140, 340) coupled to the receiver circuit (104, 110, 304, 310) and configured to process the echo of the mmW FMCW transmit signal. The receiver circuit (104, 110, 304, 310) is configured to operate with at least two different paths for at least two successive chirps of the mmW FMCW transmit signal and create therefrom at least two respective received chirp signals; and the BIST circuit (140, 340) is configured to process and compare the at least two respective received chirp signals and determine therefrom an operational state of at least one circuit or component within the receiver circuit (104, 110, 304, 310).

Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for detecting the possibility of damage to a receiver during a self-interference measurement procedure and taking action to avoid or mitigate such damage.

A circuit includes an amplifier and pre-distortion circuit. The amplifier amplifies a modulated signal. The signal pre-distortion circuit performs a feed-forward pre-distortion of the modulated signal in a signal path in which the amplifier resides. The signal pre-distortion circuit includes: i) an envelope detector configured operative to provide an envelope information describing an envelope of the modulated signal; and ii) a built-in test circuit that determines distortion information describing a distortion in the signal path caused by amplitude variations. The signal pre-distortion circuit performs the feed-forward pre-distortion of the modulated signal on the basis of the distortion information.

A circuit includes an amplifier and pre-distortion circuit. The amplifier amplifies a modulated signal. The signal pre-distortion circuit performs a feed-forward pre-distortion of the modulated signal in a signal path in which the amplifier resides. The signal pre-distortion circuit includes: i) an envelope detector configured operative to provide an envelope information describing an envelope of the modulated signal; and ii) a built-in test circuit that determines distortion information describing a distortion in the signal path caused by amplitude variations. The signal pre-distortion circuit performs the feed-forward pre-distortion of the modulated signal on the basis of the distortion information.

A system can comprise a radio unit comprising a digital front end chain. The system can further comprise a tap point disposed within the digital front end chain, wherein the tap point is configured to time align a signal at the tap point with a system time of the radio unit. The system can further comprise a first hardware component that is configured to selectively read the signal at the tap point to produce a read signal. The system can further comprise a second hardware component that is configured to store the read signal.

A system can comprise a radio unit comprising a digital front end chain. The system can further comprise a tap point disposed within the digital front end chain, wherein the tap point is configured to time align a signal at the tap point with a system time of the radio unit. The system can further comprise a first hardware component that is configured to selectively read the signal at the tap point to produce a read signal. The system can further comprise a second hardware component that is configured to store the read signal.

Methods, apparatus, systems, and articles of manufacture are disclosed to perform a self-test of a wireless networking device. Examples disclosed herein include communication controller circuitry to cause the first WNIC to obtain a plurality of data packets from a second WNIC at a frequency. Examples herein further include signal strength determination circuitry to determine a received signal strength indicator (RSSI) value for an antenna of the first WNIC. Examples herein further include performance determination circuitry to increment a counter associated with the antenna when the RSSI value does not satisfy a first threshold and report an error associated with the antenna to a back office facility when the counter associated with the antenna does not satisfy a second threshold.

Methods, apparatus, systems, and articles of manufacture are disclosed to perform a self-test of a wireless networking device. Examples disclosed herein include communication controller circuitry to cause the first WNIC to obtain a plurality of data packets from a second WNIC at a frequency. Examples herein further include signal strength determination circuitry to determine a received signal strength indicator (RSSI) value for an antenna of the first WNIC. Examples herein further include performance determination circuitry to increment a counter associated with the antenna when the RSSI value does not satisfy a first threshold and report an error associated with the antenna to a back office facility when the counter associated with the antenna does not satisfy a second threshold.

A sensor device transmits, to an external device installed external to the sensor device, sensing data generated from monitoring a target, and includes a sensor unit that generates sensing data including background noise data. The background noise data represents noise from a cause other than the target. The sensor device further includes an extraction unit that extracts the background noise data from the sensing data, and a transmission unit that transmits the background noise data extracted by the extraction unit to the external device.

A sensor device transmits, to an external device installed external to the sensor device, sensing data generated from monitoring a target, and includes a sensor unit that generates sensing data including background noise data. The background noise data represents noise from a cause other than the target. The sensor device further includes an extraction unit that extracts the background noise data from the sensing data, and a transmission unit that transmits the background noise data extracted by the extraction unit to the external device.