A data processing unit creates a database for electric field levels of predetermined frequency bands received by a second tuner. An interfering station determination unit determines whether or not there are a first interfering station and a second interfering station to generate intermodulation interference of third-order distortion with respect to a specific receiving station. A gain calculation unit calculates, as a gain attenuation amount, a difference between at least one of an electric field level of the first interfering station and an electric field level of the second interfering station that are included in the database created by the data processing unit and a reference electric field level at which no intermodulation interference of third-order distortion occurs, the reference electric field level set on the basis of output saturation characteristics of a first high-frequency amplifier inside a first tuner, in a case where the interfering station determination unit determines that there are the first interfering station and the second interfering station. A gain control unit controls the gain of the first high-frequency amplifier using the gain attenuation amount.

A Bluetooth receiver has an RF front end which has a gain control input, the RF front end converting wireless packets into a baseband signal which is coupled to the input of an analog to digital converter (ADC). A clock generator provides a clock coupled to the ADC, and an AGC processor performs an AGC process to provide a gain which places the baseband symbols in a range that is less than 90% of the input dynamic range of the ADC. When in a connected state, the clock generator provides a clock which is slower than is required to complete the AGC process during a preamble interval, and the AGC process uses a few initial bits of the address field. The remaining bits of the address field is compared with the corresponding address bits of the receiver to determine whether to receive the packet.

A receiver includes a continuous-time equalizer, a decision-feedback equalizer (DFE), data and error sampling logic, and an adaptation engine. The receiver corrects for inter-symbol interference (ISI) associated with the most recent data symbol (first post cursor ISI) by establishing appropriate equalization settings for the continuous-time equalizer based upon a measure of the first-post-cursor ISI.

A network device includes a transceiver configured to concurrently transmit signals and receive signals within a single frequency band resulting in radio-frequency signal interference. The device includes an analog canceler configured to mitigate the signal interference. The device includes a neural network that receives data that describes characteristics of the signal interference and provides coefficients for the analog canceler as outputs. The neural network-generated coefficients are applied to the analog canceler which uses them to cancel the signal interference.

Various embodiments include methods and systems having detection apparatus operable to cancel or reduce leakage signal originating from a source signal being generated and transmitted from a transmitter. A leakage cancellation signal can be generated digitally, converted to an analog signal, and then subtracted in the analog domain from a received signal to provide a leakage-reduced signal for use in detection and analysis of objects. A digital cancellation signal may be generated by generating a cancellation signal in the frequency domain and converting it to the time domain. Optionally, an estimate of a residual leakage signal can be generated and applied to reduce residual leakage remaining in the leakage-reduced signal. Additional apparatus, systems, and methods can be implemented in a variety of applications.

The present invention provides a receiver including a filter, a signal detection circuit and a synchronization processing circuit. The filter is configured to filter a filter input signal to generate a filter output signal. The signal detection circuit is configured to determine whether the filter input signal or the filter output signal includes an interference signal according to the filter input signal and the filter output signal, to generate an interference signal indicator; wherein when the interference signal indicator indicates that the filter input signal or the filter output signal includes the interference signal, the signal detection circuit further determines whether the filter output signal comprises an effective signal to generate an effective signal indicator. The synchronization processing circuit is configured to process the filter output signal according to the interference signal indicator and the effective signal indicator.

In an embodiment, a remote antenna unit includes a transmitter, a receiver, an antenna array, and first and second interference circuits. The transmitter is configured to generate at least one transmit signal, and the receiver is configured to process at least one receive signal. The antenna array includes one or more antennas, each of at least one of the one or more antennas coupled to the transmitter and configured to radiate a respective downlink signal in response to a respective one of the at least one transmit signal, and each of at least one of the one or more antennas coupled to the receiver and configured to generate a respective one of the at least one receive signal in response to an uplink signal. And the first and second interference circuits are each coupled to the transmitter and to the receiver and are each configured to reduce interference in each of the at least one receive signal.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit, to a base station, a request for a data transmission that includes multiple subsets of data each associated with a different constellation granularity. In response to the request, the base station may encode the data transmission using multiple different constellation granularities and may transit the encoded data transmission to the UE. For example, the UE may receive the data transmission including a first subset of data that was encoded by the base station using a first constellation granularity and a second subset of data that was encoded by the base station using a second constellation granularity. The UE may then iteratively estimate phase-noises associated with respective subsets of data and perform phase-noise correction operations on the entire data transmission based on the estimated phase-noises.

A system and method for mitigating self-interference in mmWave systems. A transceiver can include a mutual precoder controller that controls both an analog/RF beamforming circuit and a digital/BB beamforming circuit to prefer beams directed along paths in the local RF environment that minimize self-interference. In other cases, a transceiver can include one or more self-interference filters to internally mitigate self-interference.

A signal adjusting circuit and a receiving end circuit using the same are provided. The signal adjusting circuit is adapted to a peak detector, and includes a first amplifier and a first feedback circuit. The first amplifier receives a first input signal, and amplifies the first input signal to output a first output signal. The first feedback circuit is connected between a first input terminal and a first output terminal of the first amplifier, and is configured to determine a first gain of the first output signal. The peak detector is connected to a first output node of the first feedback circuit, so as to receive a first detection signal and detect a peak value of the first detection signal. The peak detector has a predetermined power input range, and the first feedback circuit keeps the first detection signal within the predetermined power input range.