Under one aspect, a method is provided for processing a received signal, the received signal including a desired signal and an interference signal that spectrally overlaps the desired signal. The method can include obtaining an amplitude of the received signal. The method also can include obtaining an average amplitude of the received signal based on at least one prior amplitude of the received signal. The method also can include subtracting the amplitude from the average amplitude to obtain an amplitude residual. The method also can include, based upon an absolute value of the amplitude residual being less than or equal to a first threshold, inputting the received signal into an interference suppression algorithm so as to generate a first output including the desired signal with reduced contribution from the interference signal.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a base station, one or more downlink grants scheduling one or more corresponding downlink transmissions from the base station to the UE. In some examples, the UE may enter a state of sleep prior to receiving the one or more downlink transmissions. In such examples, the UE may wake up from the state of sleep at a first time that is at least a threshold period of time before a second time corresponding to a beginning of the one or more downlink transmissions. After waking up from the state of sleep, the UE may activate a notch filter and use the activated notch filter to filter a spur generated at the UE. The UE may receive the one or more downlink transmissions with improved reliability based on activating the notch filter.

This electronic notch filter is able to receive an input signal and deliver a filtered signal having an amplitude, at a cut-off frequency, that is attenuated with respect to that of the input signal. It comprises a module for integrating the input signal during several successive time windows, each time window starting at a respective initial time instant and having a duration substantially equal to the inverse of the cut-off frequency, the initial temporal time instants of at least two distinct windows being separated by a temporal shift of a value greater than or equal to a predefined reference duration, each integration of the input signal during a respective temporal window resulting in a respective intermediate signal; and a module for summing the intermediate signals coming from the integration module; the filtered signal depending on the sum of said intermediate signals.

An electronic device may include wireless circuitry with one or more antennas that transmit radio-frequency signals and that receive corresponding reflected signals. The wireless circuitry may detect a range to an external object based on the transmitted and received signals. The wireless circuitry may include a receive path having a mixer, an analog-to-digital converter (ADC), and a filter between the mixer and the ADC. The receive path may include a bypass path with a switch coupled around the filter. The wireless circuitry may detect the range to the external object within an ultra-short range (USR) domain when the switch is closed, thereby bypassing the filter in the receive path. The wireless circuitry may detect the range to the external object within a far-field domain when the switch is open. The filter may filter the reflected signals to remove undesired leakage and maximize dynamic range.

Methods and apparatuses for downconverting high frequency subbands to a lower frequency band and recovering signals-of interest. The system includes a controller, a signal generator, an optical source, a dual-drive mach zehnder modulator (DDMZM), a photodetector, and a dechipping/image (DI) rejector. The controller outputs chipping frequencies to the signal generator which generates local oscillator (LO) tones shifted by the respective chipping frequencies. The optical source outputs an optical signal to the DDMZM which has first and second arms and modulators. The first modulator receives a signal from a source and modulates it onto the optical signal propagating through the first arm to form a first modulated optical signal. The second modulator receives the shifted local oscillator tones and modulates them onto the optical signal propagating through the second arm to form a second modulated optical signal. The DDMZM outputs a signal which is a combination of the first and second modulated optical signals to the photodetector which generates a corresponding electrical signal. The dechipping/image (DI) rejector receives the electrical signal and one of the chipping frequencies and outputs a signal that maximizes signals in one high frequency subband while suppressing signals in other high frequency subbands.

The described technology is generally directed towards a sensor signal multiplexer and digitizer with analog notch filter and optimized sample frequency, and corresponding methods of use and manufacture. In some examples, the disclosed technologies can be used to reduce vibration sensitivity of an inertial measurement unit (IMU). The disclosed sensor signal multiplexer can sample sensor inputs on multiple input channels at a first, higher frequency, and integrate samples for each channel in order to generate lower frequency sensor outputs. The lower frequency sensor outputs can be converted to digital form.

A signal processor and method of signal processing for a radio receiver is described. An input signal is received together with a spectral repetition interval value of an interferer signal. An interference reference signal is generated from the received spectral repetition interval value and the received signal. The received signal is adapted using the generated interference reference signal.

A receiver path circuit includes a first stage, a down-sampler and a second stage. The first stage is configured to filter a mixer-output-signal received from a mixer and provide a first-stage-output-signal. The down-sampler is configured to down-sample the first-stage-output-signal to provide a transition-signal having a transition-frequency. The transition-frequency is lower than the frequency of the first-stage-output-signal. The second stage includes a switched-capacitor circuit that is configured to filter and reduce the frequency of the transition-signal in order to provide a second-stage-output-signal to an ADC.

A multiplexer includes filters and low pass filters. A second frequency band and a third frequency band are partially different. A first frequency band does not overlap the second frequency band and the third frequency band. One end of the filter is connected to a common terminal and the other end is connected to an input/output terminal. The low pass filter is connected in one end to the common terminal and in the other end to one end of the filter. The other end of the filter is connected to one end of the low pass filter. The other end of the low pass filter is connected to the input/output terminal. One end of the filter is connected to a node between the other end of the low pass filter and one end of the filter and the other end of the filter is connected to the input/output terminal.

A noise elimination device includes a noise elimination unit to generate a noise-eliminated spectrum by performing noise elimination on the basis of symmetry of noise superimposed on a reception signal spectrum.