A test and measurement system includes a proximity coupling device to transmit a modulated carrier signal and a proximity integrated circuit card to load modulate the transmitted modulated carrier signal and generate a modulated subcarrier signal on the wireless carrier signal. A test and measurement instrument acquires the modulated carrier signal and includes a phase-aligned subcarrier demodulator to demodulate the carrier signal including the modulated subcarrier signal. A demodulator detects commands and responses in the modulated carrier signal, removes the commands, and identifies a correlation index for each response. Each correlation index indicates a phase of the modulated carrier signal of the corresponding response relative to a replica carrier signal. The demodulator adjusts the phase of the replica carrier signal based on the correlation index for each response and down converts each response using the phase-aligned replica carrier signal. The modulated subcarrier signal is low pass filtered to demodulate response.

An optical sender is disclosed, which alone makes it possible to reliably decide whether modulation timing is correct or incorrect and to adjust the modulation timing. The optical sender includes: a first modulator that outputs a first optical pulse train subjected to intensity modulation; an asymmetric interferometer that outputs a second optical pulse train of double pulses; a second modulator (104) that outputs a third optical pulse train subjected to send-data modulation for each pulse pair; nd an optical intensity measuring device that measures an optical intensity of the third optical pulse train, a controller, when changing either of a first optical pulse train according to intensity modulation pattern and a second optical pulse train according to send-data modulation pattern, decides whether the modulation timing is correct or incorrect, based on optical intensity of the third optical pulse train.

A device and method for estimating the frequency difference between antennas having asynchronized local oscillator references includes a frequency meter configured for connection with radio frequency signals from two antennas and configured to output a measured frequency difference between baseband filtered signals of two antennas. The frequency meter includes a phase meter, a quadrant transition, and a frequency meter counter. The phase meter receives in-phase and quadrature pairs of filtered signals and output a phase difference between the pairs. The quadrant transition state machine receives the phase difference, detects a quadrant associated with the phase difference, and detects a change between the detected quadrant and a previously detected quadrant. The frequency meter counter then accumulates the quadrant transitions and direction over a desired interval to establish a measure of the frequency difference between the two radio frequency signals input into phase meter.

A system may comprise a sensor, a transmitter, and a receiver where the transmitter and receiver are remote from the sensor. The receiver may include a processor and instructions to receive a signal comprising a plurality of subcarriers and including first radio waves and second radio waves, determine a signal to noise ratio of each of the subcarriers, and extract the first radio waves from the signal responsive to the signal to noise ratio of each of the subcarriers. Methods and non-transitory computer-readable media are also disclosed.

Methods, systems, and devices for wireless communications are described. A first device may receive a message indicating a configuration for performing an energy harvesting procedure. The configuration may indicate a pairing of a component carrier and a bandwidth part for the first device to use for performing the energy harvesting procedure. The pairing may be based on one or more measurements associated with the first device. As part of the energy harvesting procedure, the first device may monitor for one or more signals from a second device. The first device may monitor for the one or more signals using a set of resources that correspond to the pairing of the component carrier and the bandwidth part. The first device may receive, from the second device, one or more signals using the set of resources.

Resources are configured, by frame/subframe/slot/symbol, for uplink communication components, downlink communication components, radar sensing components, or flexible components. Flexible components are configured by symbol for uplink or downlink communications, radar sensing, or flexible usage. Full, partial or no overlap between resources for uplink, downlink or sidelink communication and resources for radar sensing may be configured. Frequency configuration for radar sensing may be in absolute units or grid units, and waveforms other than OFDM may be used for radar sensing. Configuration may be initiated by a base station in response to explicit or implicit request by a UE for sensing resources. A UE may sense resources within a configured resource pool for availability before using the resources for radar sensing.

Embodiments of this application provide a channel measurement method and a communication apparatus. The method includes: A first apparatus receives K signals, where the K signals correspond to K ports. The first apparatus measures the K signals to obtain measurement results, where the measurement results are used to determine channel state information corresponding to R ports, R is greater than K, and K is greater than or equal to 1. According to solutions provided in embodiments of this application, resource overheads for channel measurement can be reduced.

The described embodiments set forth techniques for diagnostic testing a wireless device configured for cellular wireless service. A test apparatus processes data logs obtained from the wireless device, categorizes observed cellular wireless functionality issues, and provides recommended actions for a service technician and/or a user to take. Exemplary cellular wireless issues include cellular wireless service connectivity, cellular voice call stability, and cellular eSIM profile installation and transfer failures. Recommended actions can include directing a user to contact a mobile network operator with particular observations, adjusting wireless device settings, repair of a wireless device component, updating wireless device software, or replacement of the wireless device.

A device and method for estimating the frequency difference between antennas having asynchronized local oscillator references includes a frequency meter configured for connection with radio frequency signals from two antennas and configured to output a measured frequency difference between baseband filtered signals of two antennas. The frequency meter includes a phase meter, a quadrant transition, and a frequency meter counter. The phase meter receives in-phase and quadrature pairs of filtered signals and output a phase difference between the pairs. The quadrant transition state machine receives the phase difference, detects a quadrant associated with the phase difference, and detects a change between the detected quadrant and a previously detected quadrant. The frequency meter counter then accumulates the quadrant transitions and direction over a desired interval to establish a measure of the frequency difference between the two radio frequency signals input into phase meter.

According to one embodiment, an information processing apparatus includes a processor. The processor is configured to acquire first received power on a route of a moving vehicle passing between a signal emission source and a radio wave shield, based on radio waves emitted from the signal emission source, in a state in which the radio wave shield is arranged at a first position, acquire second received power, which is a radio wave emitted from the signal emission source and measured on the route, in a state in which the radio wave shield is not arranged at the first position, and set a part of an area on the route as a target area based on an index related to fluctuation between the first received power and the second received power.