Systems and methods for extracting polarized sub-signals from a dual-polarized signal includes isolating the polarized sub-signals using one or more filters. When a single filter is used to derive a first sub-signal, analog interference cancellation may be used to derive the second sub-signal. When two filters are used, the first and second sub-signals may each be derived using a corresponding filter.

An apparatus, method and computer program product is disclosed. The apparatus may comprise means for transmitting and receiving radio frequency signals using a radio system coupled to an external antenna via an additional combiner or diplexer, means for receiving one or more reference signals usable for measurement of passive intermodulation from one or more nodes provided in a signal path external to the radio system, a first one of said nodes being associated with a signal path between the additional combiner or diplexer and the external antenna, and means for performing passive intermodulation cancellation based on the received one or more reference signals, including a first reference signal from the first node.

Methods, systems, and devices for wireless communications are described. A first wireless node may transmit, to a control node, an indication of a capability of the first wireless node to perform one or more self-interference cancelation (SIC) procedures between a first antenna array of the first wireless node and a second antenna array of the first wireless node. The first wireless node may receive, from the control node in response to the indication of the capability, a configuration for the first wireless node to use to perform a SIC procedure of the one or more SIC procedures for full-duplex communications. The first wireless node may then communicate, according to the received configuration, with the control node, a control node, or any combination thereof, using the first antenna array and the second antenna array.

A network device for an intercom network for duplex audio communication between users of the intercom network has a housing and a communication module in or at the housing and that can establish a radio link for transmitting audio signals to and receiving audio signals from another user. The radio link is subject to the DECT protocol or another protocol, and the audio signals to the communication module is broken by reflection into a plurality of radio paths. Multipath interference is prevented or reduced by electronic elements including at least one equalizer for processing a plurality of audio signals received along the plurality of radio paths and performing a signal correction.

A system for canceling signal interference (SI) includes a transceiver configured to concurrently transmit signals and receive signals within a single frequency band, which causes signal interference between the transmitted and received signals. The SI canceller is configured to use a set of cancellation coefficients to generate a cancellation signal to mitigate the SI. The system is configured to iteratively change the cancellation coefficients by a step factor to produce tuned cancellation coefficients. The step factor is determined by a cancellation error gradient and one or more of: a tunable coefficient step aggressiveness factor; and a time-based forgetting factor; and cause the SI canceller to cancel the SI using the tuned cancellation coefficients.

A system for signal detection including a receiver, a transforming block, a noise reduction block, and an object detection block. The receiver is adapted to provide an initial dataset sampled in a time domain over a frequency range. The transforming block is adapted to receive the initial dataset and convert the initial dataset from the time domain to a multi-channel time-frequency domain array. The noise reduction block is adapted to receive the multi-channel time-frequency domain array and provide a clean data set, wherein the clean data set is defined as a noise signal subtracted from the multi-channel time-frequency domain array. The object detection block is adapted to receive the clean dataset and to provide a bounded data set, wherein the bounded data set is defined by a bounding box associated with a portion of the multi-channel time-frequency domain array containing a signal with energy above a threshold level.

Systems and methods for duplexer circuits having signal cancellation paths are provided. In one aspect, a duplexer circuit includes a first transmit filter configured to receive a first radio frequency transmit signal from a power amplifier, and a first receive filter configured to receive the first radio frequency transmit signal from the first transmit filter. The circuit also includes a first low-noise amplifier configured to receive the first radio frequency transmit signal from the first receive filter and amplify the first radio frequency transmit signal and a cancellation path configured to receive a second radio frequency transmit signal from the power amplifier. The circuit further includes a phase shifter configured to apply a phase shift to one or both of the first and second radio frequency transmit signals, and a second low-noise amplifier configured to amplify the second radio frequency transmit signal.

Disclosed is an over-the-air (OTA) antenna meter application (“meter app”) that wirelessly connects to an OTA antenna meter (“meter”) installed with an OTA antenna and presents information that facilitates a user in installing the OTA antenna at the premises of a customer. For example, the meter app can help the user in pointing and peaking the OTA antenna for one or more broadcast channels, e.g., those selected by the customer. The meter app can store installation information of the OTA antenna for various installations, which can be used in generating a recommendation of, or predicting, installation information for installing the OTA antenna at a specified address. The predicted installation information can include broadcast channels that would be available for reception at the specified address and their signal strength, a specific location of installation on the premises, or whether a pre-amplifier and/or filter is required.

Example access network devices are described. One example access network device includes a signal processing apparatus. The signal processing apparatus includes a first power amplifier, a second power amplifier, a first filter, a second filter, and a combiner. The first filter filters a second signal obtained by the first power amplifier, to obtain a first sub-signal belonging to a first frequency band and a second sub-signal belonging to a second frequency band. The second filter filters a fourth signal obtained by the second power amplifier, to obtain n sub-signals including at least a third sub-signal belonging to a third frequency band. The combiner combines the first sub-signal and i sub-signals in the n sub-signals based on a preset condition, to obtain a first combined signal. The communication module sends the first combined signal by using a first port, and sends the second sub-signal by using a second port.

Control of a digital communication system having a plurality of communication lines on which signals are transmitted and received is implemented using a variety of methods and systems. According to one embodiment of the present invention, a method is implemented where the signals are affected by interference during transmission and each of the communication lines has at least one transmitter and at least one receiver. A model is created of the interference characteristics due to the signals carried on the communication lines. Interference characteristics for a line are determined based on the model and actual signals carried on other communication lines different from the line for which the characteristics are being determined. Actual interference is compensated for on the communication line using the determined interference characteristics.