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.

An exemplary radar sensing system utilizing a sparse array antenna structure provides an enhanced angular resolution to detect multiple targets with improved accuracy beyond the abilities of conventional radar. The exemplary radar system uses sparsely located antenna array elements allowing improved FOV, angular resolution, beam width, and side lobes using fewer physical antenna elements. Sparse antenna arrays allow the use of physically larger elements, larger separation between transmitter and receiver elements to reduce mutual coupling, and fewer elements to reduce necessary computations.

Systems and methods for diplexer circuits with leakage cancellation are provided. In one aspect, a diplexer circuit including first and second radio frequency transceiver terminals and a first antenna terminal, and first and second parallel communication paths extending between the first radio frequency transceiver terminal and the first antenna terminal, and third and fourth parallel communication paths extending between the second radio frequency transceiver terminal and the first antenna terminal. The circuit also includes a first phase shifter configured to apply a first phase shift to a first radio frequency transmit signal on the first communication path, a second phase shifter configured to apply a second phase shift to a second radio frequency on the second communication path, and a third phase shifter configured to apply a third phase shift to the first radio frequency transmit signal on the third communication path.

Systems and methods for duplexer circuits having signal leakage cancellation are provided. In one aspect, a duplexer circuit includes a transmit path splitter configured to split a radio frequency transmit signal into a pair of radio frequency transmit signals, and a receive path splitter configured to combine a pair of radio frequency receive signals. The duplexer circuit also includes an antenna path splitter configured to combine a pair of radio frequency transmit signals and split a radio frequency receive signal into the pair of radio frequency receive signals, and first and second duplexers. The first duplexer is coupled to a first leg of each of the transmit path splitter, the receive path splitter, and the antenna path splitter, and the second duplexer is coupled to a second leg of each of the transmit path splitter, the receive path splitter, and the antenna path splitter.

An electronic device may be provided with wireless circuitry. The wireless circuitry may include one or more antennas. The antennas may include phased antenna arrays each of which includes multiple antenna elements. Phased antenna arrays may be mounted along edges of a housing for the electronic device, behind a dielectric window such as a dielectric logo window in the housing, in alignment with dielectric housing portions at corners of the housing, or elsewhere in the electronic device. A phased antenna array may include arrays of patch antenna elements on dielectric layers separated by a ground layer. A baseband processor may distribute wireless signals to the phased antenna arrays at intermediate frequencies over intermediate frequency signal paths. Transceiver circuits at the phased antenna arrays may include upconverters and downconverters coupled to the intermediate frequency signal paths.

Example signal processing methods and apparatus are described. 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.

A method of mitigating interference in a received wireless signal by adaptive digital filtering efficiently deploys computational resources by using at least one of a DDC, weight generator, and scrubber to perform calculations necessary to generate a plurality of output streams. Embodiments transition a weight generator and scrubber between receiver frequencies according to a known frequency hopping pattern of an FHSS transmission. Other embodiments dedicate scrubbers to receiver frequencies while transitioning a weigh generator between the frequencies to generate sets of weights that can be persistently used by the scrubbers. Embodiments generate sets of weights according to one received multipath signal copy, and then apply the generated weights to filter additional multipath copes received at the same frequency. Various embodiments dedicate a DDC to each receive frequency to form a bank of down-converted outputs, from among which each weigh generator can select primary and reference inputs.

A method of tuning a self-interference cancellation circuit, wherein the self-interference cancellation circuit comprises a filtering means configured to vary a phase and an amplitude of a transmit signal based on a first filter weight. The method comprising transmitting a first transmit signal, receiving a first received signal in response to transmitting the first transmit signal; estimating, based on the first received signal, a first derivate of a cost function with respect to the first filter weight; estimating, based on the first received signal, a second derivative of the cost function with respect to the first filter weight; determining a first step size based on the second derivative; calculating an updated first filter weight based on the first filter weight, the first step size, and the first derivative; and updating the filtering means based on the updated first filter weight.

A radio frequency transmission system and methods for mitigating multipath radio frequency interference are disclosed. Embodiments include a first helical antenna having a first radius and operable to receive a first electromagnetic signal, and a second helical antenna having a second radius and operable to receive a second electromagnetic signal. Further embodiments include a phase adjuster configured to receive the first electromagnetic signal as an input signal, apply an adjustable phase delay to the input signal, and output an adjusted electromagnetic signal. Still further embodiments include a signal combiner configured to receive the adjusted electromagnetic signal and the second electromagnetic signal and output a combined electromagnetic signal.

A signaling circuit having a selectable-tap equalizer. The signaling circuit includes a buffer, a select circuit and an equalizing circuit. The buffer is used to store a plurality of data values that correspond to data signals transmitted on a signaling path during a first time interval. The select circuit is coupled to the buffer to select a subset of data values from the plurality of data values according to a select value. The equalizing circuit is coupled to receive the subset of data values from the select circuit and is adapted to adjust, according to the subset of data values, a signal level that corresponds to a data signal transmitted on the signaling path during a second time interval.