A signal processing device includes a prediction and correction engine configured to receive a signal including a target signal, and to execute a single-moment filter, based on a current measurement sample of the signal and a model of the target signal, to obtain a single-moment state estimate and a single-moment state estimate error covariance for the target signal, a covariance renormalizer configured to determine a multi-moment state estimate error covariance for the target signal based on a prior single-moment state estimate error covariance, corresponding to a sample prior to the current measurement sample, and the single-moment state estimate error covariance, and a multi-moment prediction and correction engine configured to execute a multi-moment filtering extension based on the current measurement sample and the multi-moment state estimate error covariance to obtain a multi-moment state estimate, and further configured to determine an estimate for the target signal based on the multi-moment state estimate.

A radio frequency transceiver is disclosed herein. The radio frequency transceiver comprises a transmitter, a receiver comprising a full complex mixer capable of operating as a frequency down-converter, and an in-phase and quadrature (IQ) imbalance calibration module. The IQ imbalance calibration module is connected with (e.g., only connected with) the transmitter. The IQ imbalance calibration module is arranged calibrate the transmitter to reduce its IQ imbalance. The IQ imbalance calibration module is not arranged calibrate the receiver. Use of the full complex mixer in the receiver eliminates the need for calibrating the receiver.

Techniques are provided for providing Doppler correction. In particular, embodiments may provide re-banding circuitry having a reference clock, a mixer, and a compensation circuitry for re-banding and for Doppler correction. The compensation circuitry may be configured to adjust a reference frequency of the reference clock based on signals received from a Global Navigation Satellite System (GNSS) receiver. The mixer may be configured to translate communication signals in a first frequency band to a second frequency band based at least in part on the adjusted reference frequency of the reference clock.

A repeater system includes a first RF repeater device arranged in a first topology of a network of RF repeater devices, to communicate with one or more second RF repeater devices in the network of RF repeater devices to service a source node and destination nodes in a wireless network. The first RF repeater device detects a change in a network condition in wireless network between source node and the destination nodes. Based on the detected change in network condition, the one or more second RF repeater devices are controlled in network of RF repeater devices to re-configure the first topology of network of RF repeater devices to a second topology. The re-configuration of first topology of network of RF repeater devices to second topology is executed to continue to service source node and the destination nodes in the wireless network in the changed network condition.

A signal processing device includes: a processor; and a memory having instructions. When executed by the processor, the instructions cause the signal processing device to perform operations including: converting a first signal that is a time domain signal into a second signal that is a frequency domain signal in response to reception of the first signal, the first signal containing noise superimposed on a broadcast electric signal derived from a broadcast electromagnetic wave, the noise having peaks of amplitude at regular frequency intervals in the frequency domain; calculating a frequency interval between the peaks of the noise in the frequency domain based on a correlation of the second signal; determining a frequency shift amount in the frequency domain based on the frequency interval; and shifting a frequency of the second signal by the frequency shift amount to create a frequency-shifted signal.

An example device may include an antenna node configured to be coupled to an antenna element. The antenna node may be configured to pass wireless communications over multiple frequency bands. The device may also include multiple signal paths coupled to the antenna node. Each of the multiple signal paths may be configured to carry a signal from a different one of the multiple frequency bands. The device may further include a switch element coupled to the antenna node by the multiple signal paths and an amplifier circuit within the multiple signal paths between the switch element and the antenna node. The amplifier circuit may be configured to amplify the signals carried by the multiple signal paths.

Technology for a pre-amplification system for a modem is disclosed. The pre-amplification system can include an uplink-downlink signal path communicatively coupled between a first modem port of the modem and a first donor antenna port. The pre-amplification system can include a downlink signal path communicatively coupled between a second modem port of the modem and a second donor antenna port. The downlink signal path can include a pre-amplifier configured to amplify a received downlink cellular signal to produce an amplified downlink cellular signal to be directed to the second modem port.

A frequency up-conversion device and a signal transmission system are provided. A frequency up-conversion device includes a first diplexer, a divider, a digital channel stacking circuit, an up-conversion mixer, and a second diplexer. The first diplexer divides a first signal into a second signal and a third signal. The digital channel stacking circuit transforms the second signal to a fourth signal. The up-conversion mixer mixes the fourth signal and an up-conversion oscillating signal to generate a fifth signal. The second diplexer receives the fifth signal and the third signal to generate a sixth signal for output.

A decentralized communication device is provided that facilitates optimal positioning and orientation of one or more antennas for wireless communication with external devices. The decentralized communication device includes one or more master components and one or more slave components. The master and the slave components are physically separate and communicate wirelessly. In some embodiments the slave acts as a carrier frequency translator between the master and an external wireless device, where it communicates with the external device using a first frequency and communicates with the master using a second frequency which is different from the first frequency. In another embodiment the slave has most or all the physical layer to do the digital coding, digital modulation, data framing, data formatting and data packetization for communicating with an external device, in which case digital coding and digital modulation is distributed between the master and the slave.

An electronic device may include wireless circuitry. The wireless circuitry may include at least a digital predistortion circuit, an upconversion circuit, and a load-line modulated amplifier circuit. The digital predistortion circuit can be configured to receive a reference baseband signal from one or more processors and to selectively output a predistorted version of the reference baseband signal. The upconversion circuit can be configured to receive a signal from the digital predistortion circuit and to output a radio-frequency signal. The load-line modulated amplifier circuit can be configured to amplify the radio-frequency signal. The load-line modulated amplifier circuit can include an adjustable load component. The adjustable load component can have a constant impedance when an instantaneous signal amplitude of the reference baseband signal is within a first range and can be tuned to have a varying impedance when the instantaneous signal amplitude of the reference baseband signal is within a second range.