A system that incorporates the subject disclosure may perform, for example, a method for receiving interference information, identifying a plurality of interferers, approximating a location of the plurality of interferers, and adjusting an antenna pattern of an antenna. The method can include determining traffic loads and adjusting the antenna pattern according to the traffic loads. Other embodiments are disclosed.

A system that incorporates aspects of the subject disclosure may perform operations including, for example, obtaining uplink information associated with a downlink path, wherein the uplink information includes operational parameters used by a plurality of communication devices for transmitting wireless signals on a plurality of uplink paths; performing, based on the uplink information, a plurality of measurements of the plurality of uplink paths; identifying a measurement from the plurality of measurements that is below a threshold, thereby indicating an affected uplink path of the plurality of uplink paths; initiating a first filtering of the affected uplink path, wherein the initiating is based on the identifying and wherein the first filtering is based upon one or more first filtering parameters; and receiving instructions comprising one or more updated filtering parameters, wherein the instructions are received by the system at a port of the system. Other embodiments are disclosed.

A user equipment, method and computer program for adjusting an effective centre frequency of channel filter in a user equipment to improve the adjacent selectivity when the network is transmitting on an irregular bandwidth channel and the user equipment is receiving the signal via a channel filter that has a wider pass band than the bandwidth of the channel. The method comprises filtering received wireless communication signals at a channel filter. Identifying a preferred centre frequency for the channel filter by: adjusting a centre frequency of the channel filter; determining a level of adjacent channel selectivity of signals filtered by the channel filter; comparing a level of adjacent channel selectivity at different centre frequencies of the channel filter; and identifying the preferred centre frequency as the centre frequency that provides a highest level of adjacent channel selectivity.

This frequency tripler system uses a cascade of integrated transistor circuit differential limiting amplifiers and tunable notch filters that can directly serve one or more outputs, such as a direct clock or local oscillator drive. With this topology, filtering is distributed between two or more stages of differential limiting amplifiers and tunable notch filters. This enables suppression of smaller fundamental tone by the differential limiting amplifiers along with the tunable notch filters and yields a strong third harmonic signal to directly drive high performance mixers and digital-to-analog converters.

The demodulating apparatus includes circuits of receiving modulated radio signals coming from a plurality of transmission devices, first demodulating a first reception signal DPSK-modulated among the radio signals, modulating demodulation signals into modulation signals based on DPSK, estimating an amplitude and a phase of a propagation signal on a propagation path leading to the reception circuit from the transmission device on the basis of the radio signal and the modulation signal, first generating, based on the variables, a first simulated signal simulating the first reception signal from the modulation signal, extracting a signal obtained by cancelling the first simulated signal from the radio signals, and repeating processes of the first demodulating, the modulating, the estimating, the first generating and the extracting to such a limit as to enable the first demodulating.

A receiver for OFDM subcarriers has a first mode and a second mode. In the first mode, a tunable system clock is output at a nominal frequency, and in the second mode, the tunable system clock is offset so that a harmonic of the tunable system clock coincides with a particular OFDM subcarrier. The tunable system clock is coupled to a programmable modem PLL clock generator which generates clocks for an A/D converter coupled to a baseband processor which is also coupled to the programmable modem PLL clock generator. The programmable modem PLL clock generator is programmed to maintain a constant output frequency of each output in the first mode and the second mode.

The demodulating apparatus includes circuits of receiving modulated radio signals coming from a plurality of transmission devices, first demodulating a first reception signal DPSK-modulated among the radio signals, modulating demodulation signals into modulation signals based on DPSK, estimating an amplitude and a phase of a propagation signal on a propagation path leading to the reception circuit from the transmission device on the basis of the radio signal and the modulation signal, first generating, based on the variables, a first simulated signal simulating the first reception signal from the modulation signal, extracting a signal obtained by cancelling the first simulated signal from the radio signals, and repeating processes of the first demodulating, the modulating, the estimating, the first generating and the extracting to such a limit as to enable the first demodulating.

One example includes a receiver system. The receiver system includes an analog-to-digital converter (ADC) configured to convert an analog input signal into a digital output signal at a sampling frequency. The receiver system also includes a spur correction system configured to receive the digital output signal and to estimate spurs associated with the digital output signal and to selectively correct a subset of the spurs associated with a set of frequencies that are based on the sampling frequency.

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.

A base station configured to perform a method for self-interference cancelation (SIC) is provided. The method includes transmitting, by a transceiver configured to transmit an uplink channel and a downlink channel concurrently, one or more signals, the transceiver coupled to, or including, a first number of transmit antennas and a second number of receive antennas. The method also includes, for at least one receive antenna of the second number of receive antennas, applying a forward path model including a non-linear component corresponding to a transmit path in the transceiver, and applying an equalizer function to a first signal to be transmitted by at least one transmit antenna of the first number of transmit antennas determine a self-interference (SI) estimate; and subtracting, in SIC circuitry, the SI estimate from the signal received via at least one receive antenna of the second number of receive antennas to obtain an residual signal.