Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a device may identify, for a set of frequency values and a set of temperature values, characterization gain values associated with an analog component. The device may determine a frequency contribution based at least in part on comparing a first observed gain associated with a reference frequency and a second observed gain associated with a target frequency. The device may determine a temperature contribution based at least in part on comparing a first characterization gain value associated with a reference temperature and a second characterization gain value associated with a target temperature. The device may determine a gain offset for the target temperature and the target frequency based at least in part on combining the frequency and temperature contributions. The device may configure the gain offset for the analog component. Numerous other aspects are described.

One example communication device receives a radio frequency (RF) signal. The communication device may include a radio frequency integrated circuit (RFIC) that includes an internal attenuator. The RFIC and other processing circuitry may convert the received RF signal to a baseband frequency to generate a processed complex baseband signal. A digital signal processor of the communication device may determine, based on detection of or lack of detection of distortion terms in a frequency spectrum of the processed complex baseband signal at frequencies corresponding to integer multiples of a symbol rate of a linear modulation interferer, a modulation type of an interferer signal that forms at least part of the processed complex baseband signal. The digital signal processor may also control whether the internal attenuator is enabled based on a received signal strength indication (RSSI) of a desired RF signal and the modulation type of the interferer signal.

One example communication device receives a radio frequency (RF) signal. The communication device may include a radio frequency integrated circuit (RFIC) that includes an internal attenuator. The RFIC and other processing circuitry may convert the received RF signal to a baseband frequency to generate a processed complex baseband signal. A digital signal processor of the communication device may determine, based on detection of or lack of detection of distortion terms in a frequency spectrum of the processed complex baseband signal at frequencies corresponding to integer multiples of a symbol rate of a linear modulation interferer, a modulation type of an interferer signal that forms at least part of the processed complex baseband signal. The digital signal processor may also control whether the internal attenuator is enabled based on a received signal strength indication (RSSI) of a desired RF signal and the modulation type of the interferer signal.

The disclosure provides a method for measuring a power of a non-constant envelope modulated signal, an electronic device, and a computer readable storage medium. The method includes: sampling baseband I/Q data transmitted by a device under test to obtain sample data, in which a sampling duration is less than a length of a cycle of the non-constant envelope modulated signal; calculating a sample power within the sampling duration based on the sample data; matching in predetermined baseband I/Q data in the cycle based on the sample data to obtain a target baseband I/Q data segment; obtaining a power calibration value corresponding to the target baseband I/Q data segment; and obtaining an actual power of the non-constant envelope modulated signal in the cycle based on the power calibration value corresponding to the target baseband I/Q data segment and the sample power within the sampling duration.

The disclosure provides a method for measuring a power of a non-constant envelope modulated signal, an electronic device, and a computer readable storage medium. The method includes: sampling baseband I/Q data transmitted by a device under test to obtain sample data, in which a sampling duration is less than a length of a cycle of the non-constant envelope modulated signal; calculating a sample power within the sampling duration based on the sample data; matching in predetermined baseband I/Q data in the cycle based on the sample data to obtain a target baseband I/Q data segment; obtaining a power calibration value corresponding to the target baseband I/Q data segment; and obtaining an actual power of the non-constant envelope modulated signal in the cycle based on the power calibration value corresponding to the target baseband I/Q data segment and the sample power within the sampling duration.

A disclosed radio frequency (RF) system, such as a cognitive radar, includes a software defined radio (SDR), an adaptive transmit amplifier, and a host computer. The system performs optimization operations including selecting an initial impedance as a load impedance for the RF device and iteratively performing image completion operations until a convergence criterion is satisfied. The image completion operations may include measuring a performance of the RF device to obtain a measured performance corresponding to the load impedance, storing the measured performance as a point on a measured load-pull contour image, performing a load-pull extrapolation to extrapolate, from the load impedance, a predicted optimal impedance, and saving the predicted impedance as the load impedance for a next iteration of the image completion operations. The convergence criterion may be satisfied when a predicted impedance matches one of the previously measured impedances.

A disclosed radio frequency (RF) system, such as a cognitive radar, includes a software defined radio (SDR), an adaptive transmit amplifier, and a host computer. The system performs optimization operations including selecting an initial impedance as a load impedance for the RF device and iteratively performing image completion operations until a convergence criterion is satisfied. The image completion operations may include measuring a performance of the RF device to obtain a measured performance corresponding to the load impedance, storing the measured performance as a point on a measured load-pull contour image, performing a load-pull extrapolation to extrapolate, from the load impedance, a predicted optimal impedance, and saving the predicted impedance as the load impedance for a next iteration of the image completion operations. The convergence criterion may be satisfied when a predicted impedance matches one of the previously measured impedances.

Use of high frequency waves, such a millimeter waves, in many circumstances is prevented due to their inability to diffract around common obstacles. Disclosed herein is a system and method for transforming an incident high frequency wave. The system includes meta-atom pairs that define a surface. The meta-atom pairs generate an electro-magnetic response by interacting with an incident wave. This electro-magnetic response can be modulated by applying voltage to the meta-atom pairs. The electro-magnetic response transforms the incident wave into an emitted wave based on its controlled properties. The system and method are able to, by changing the voltage applied, steer the emitted wave a full 360 degrees as wells as transmit it through the surface without significant power loss. Embodiments enable the transmission through or around many obstacles that would normally interfere with high frequency waves.

Use of high frequency waves, such a millimeter waves, in many circumstances is prevented due to their inability to diffract around common obstacles. Disclosed herein is a system and method for transforming an incident high frequency wave. The system includes meta-atom pairs that define a surface. The meta-atom pairs generate an electro-magnetic response by interacting with an incident wave. This electro-magnetic response can be modulated by applying voltage to the meta-atom pairs. The electro-magnetic response transforms the incident wave into an emitted wave based on its controlled properties. The system and method are able to, by changing the voltage applied, steer the emitted wave a full 360 degrees as wells as transmit it through the surface without significant power loss. Embodiments enable the transmission through or around many obstacles that would normally interfere with high frequency waves.

A wireless communications device may include a controller configured to, in a calibration mode, obtain a first output value of a first power detector after setting a first power amplifier to a first gain and obtain a second output value of the first power detector after setting the first power amplifier to a second gain, wherein the controller may estimate, in a normal mode, output power of a first antenna from an output value of the first power detector, based on a correction coefficient calculated using the first output value and the second output value.