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.

Examples of receivers, communication devices, and signal processing methods are described One example receiver includes a frequency mixer, a phase switching device, and an intermediate frequency processor. The phase switching device is coupled to the frequency mixer, and is configured to provide a first local oscillator signal for the frequency mixer or provide a second local oscillator signal for the frequency mixer. A difference between a phase of the first local oscillator signal and a phase of the second local oscillator signal is a first phase difference. The frequency mixer is coupled to the intermediate frequency processor, and is configured to: receive a signal provided by the phase switching device, perform frequency mixing on a received first signal based on the signal provided by the phase switching device, and provide a signal obtained through frequency mixing for the intermediate frequency processor.

An integrated analog to digital converting and digital to analog converting (ADDA) RF transceiver for satellite applications, configured to replace conventional analog RF down and up conversion circuitry. The ADDA RF transceiver includes one of more ADCs, DSPs, and DACs, all on a single ASIC. Further, the circuity is to be radiation tolerant for high availability and reliability in the ionizing radiation environment present in the space environment.

A system for processing audio signals is disclosed. The system comprises a computer with a digital audio workstation (DAW) software installed, an audio interface coupled to or integrated with the computer, an analog audio processor (AAP) hardware coupled to the audio interface. A digital audio stream from within the DAW software is converted, via the audio interface, to an analog audio signal, then routed through the AAP hardware for fully analog processing and altering, then converted back, via the audio interface, to an altered digital audio stream and finally routed back to the DAW software. The DAW software comprises an AAP plugin which controls a number of audio processing settings of the AAP hardware via a control connection between the AAP plugin and the AAP hardware. The AAP plugin comprises a digital signal processor (DSP) subroutine which applies digital audio effects on the previously altered digital audio stream.

An integrated analog to digital converting and digital to analog converting (ADDA) RF transceiver for satellite applications, configured to replace conventional analog RF down and up conversion circuitry. The ADDA RF transceiver includes one of more ADCs, DSPs, and DACs, all on a single ASIC. Further, the circuitry is to be radiation tolerant for high availability and reliability in the ionizing radiation environment present in the space environment.

An integrated analog to digital converting and digital to analog converting (ADDA) RF transceiver for satellite applications, configured to replace conventional analog RF down and up conversion circuitry. The ADDA RF transceiver includes one of more ADCs, DSPs, and DACs, all on a single ASIC. Further, the circuitry is to be radiation tolerant for high availability and reliability in the ionizing radiation environment present in the space environment.

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.

An aspect of the disclosure relates to a method of reducing a third-order intermodulation component at a first terminal of a transistor, including: receiving an input radio frequency (RF) signal cycling with a first frequency at a control terminal of the transistor; generating a feedback RF signal cycling at a second frequency at a second terminal of the transistor, wherein the second frequency is substantially twice the first frequency; and generating a third-order intermodulation cancellation component at the first terminal including combining the input RF signal with the feedback RF signal, wherein the third-order intermodulation cancellation component has a magnitude and phase substantially equal to and opposite a magnitude and phase of the third-order intermodulation component at the first terminal of the transistor, respectively.

Wireless communication circuitry may include active phase shifter circuitry. The active phase shifter circuitry may include a quadrature hybrid coupler and amplifiers coupled to the outputs of the quadrature hybrid coupler. An additional quadrature hybrid coupler may be coupled to the amplifiers.