Aspects of the present disclosure may involve use of a radio frequency receiver and in such a receiver, tracking multipath gains and delays of multipath reflections corresponding to an OFDM multipath transmission channel. The gains and delays are based on time-domain evolution of the channel impulse response. Multipath reflections are searched for and then used to calculate channel correlation information to provide channel estimations to aid in mitigating or cancelling distortion of the received signal.

An antenna distribution unit distributes an input RF signal comprised of multiple discrete antenna feeds to a plurality of electronic devices in communication therewith. The antenna distribution unit engages in three-way signal splitting across a pair of successive splitting stages in order to produce an even multiplicity of high-quality signals across nine output ports. By limiting signal splitting to two splitting stages and carefully selecting components to maintain series and parallel impedance, a high-fidelity output signal is produced having an essentially flat spectrum over the target frequency band. In particular, the antenna distribution unit is optimized for use in the distribution of signals within the TV VHF low band of 50 MHz to 88 MHz, the TV VHF high band of 175 MHz to 213 MHz, the TV UHF band of 470 MHz to 610 MHz, and the 900 band of 900 MHz to 1000 MHz.

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.

A system for wireless communication may include a passive gain front end circuit coupled to an N-path filter. In a transmit mode, signals may be provided to an antenna through the passive gain circuit. In the transmit mode, the N-path filter may provide isolation at the antenna. In a receive mode, the passive gain front end may provide gain to the received signal. In the receive mode, the N-path filter may be used to downconvert the received signal.

An interference canceling subsystem for a bidirectional communications network includes an input interface configured to receive a first data signal from a first transceiver of the network, an output portion configured to receive a second data signal from a second transceiver of the network, a first signal path connecting the input interface to the output portion, a second signal path connecting the output portion to the input interface, and a first interference canceler disposed between the output portion and the input interface along the second signal path. The first signal path is configured to relay the first data signal from the input interface to the output portion. The interference canceler is configured to (i) relay the second data signal from the output portion to the input interface, and (ii) remove portions of the first data signal from the relayed second data signal prior to reaching the input interface.

A data processing device includes a restoration unit that performs a conversion operation on an input signal to convert the input signal into a signal having no distortion caused by an external factor, and a selection unit that selects and outputs either an unrestored signal, which is the input signal, or a restored signal, which is a signal obtained by the restoration unit by performing the conversion operation, based on a feature quantity of the unrestored signal and on a feature quantity of the restored signal.

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.

Systems and Techniques are provided for a radio frequency input/output (RFIO) circuit. An example RFIO circuit can include an a receive (Rx) path comprising a low noise amplifier (LNA). The example RFIO circuit can include a transmit (Tx) path comprising a power amplifier (PA). The example RFIO circuit can include a balun configured to RF couple an RFIO terminal to the Rx path or to the Tx path. The one or more selection components are configured to selectively enable the Rx path or the Tx path.

An apparatus for calibrating a multi-antenna system includes an unmanned aerial vehicle (UAV). The UAV includes one or more millimeter-wave (mm-wave) single channel radios that can transmit and receive a mm-wave signal to or from a multi-antenna system under test; at least one directional antenna connected to the one or more radios; sensors that determine a position of the UAV; an omni-directional mobile or Wi-Fi transceiver that communicates with an operator; and a digital microprocessor unit connected to the one or more mm-wave single channel radios, the sensors, and the omni-directional mobile or Wi-Fi transceiver. The digital microprocessor unit can control motion of the UAV and analyze signals received from the one or more mm-wave single channel radios and the at least one directional antenna using position information received from the sensors.

An integrated circuit chip implementing multiplication of an M×N element matrix with an N-element vector to obtain an M-element product by combining the vector with rows of bits of the same significance selected from the matrix one bit-row at a time to form partial products, exploiting the fact that the same potential combinations are needed for all bit-rows and all matrix rows to precompute all of the combinations once and for all, and combining selected partial products for different bit place-significance with a shift-and-add operation only once for each of the M product elements, thereby effectively using only M multiply-equivalent structures. An N-point Complex Fourier Transform can therefore be claimed which only needs 2N real multiplies and the product of an N×N matrix with another N×N matrix requires only N.sup.2 multiplies.