A wideband receiver system comprises a wideband analog-to-digital converter (ADC) module and a digital frontend (DFE) module. The wideband ADC is configured to concurrently digitize a band of frequencies comprising a plurality of desired channels and a plurality of undesired channels. The DFE module is coupled to the digital in-phase and quadrature signals. The DFE module is configured to select the plurality of desired channels from the digitized band of frequencies, and generate an intermediate frequency (IF) signal comprising the selected plurality of desired channels and having a bandwidth that is less than a bandwidth of the band of frequencies, where the generation comprises frequency shifting of the selected plurality of desired channels. The IF signal may be a digital signal and the DFE is configured to output the IF signal via a serial or parallel interface.

A Sigma-Delta () modulator for converting an analog input signal having a frequency bandwidth around a variable center frequency f.sub.0 to a digital output signal at a sampling frequency f.sub.s. The modulator comprises a quantizer (420) for generating the digital output signal and a loop filter for shaping the quantization noise. The loop filter comprises at least one subfilter (430, 410) centered around a frequency f.sub.0 and constant noise shaping coefficients (451, 452, 453). The modulator further comprises a tunable delay element (455), a frequency adjuster (480) for adjusting the sampling frequency f.sub.s such that the normalized center frequency f.sub.0/f.sub.s is constant, and a delay adjuster (490) for adjusting the loop delay t.sub.d implemented by the quantizer and the tunable delay element (455), such that the normalized loop delay t.sub.d/T.sub.s falls in a predetermined range [t.sub.min, t.sub.max], where T.sub.s=1/f.sub.s.

The present disclosure relates to a method for demodulating a RF signal comprising the steps of: detecting if an analog to digital converter (ADC) of a Near Zero Intermediate Frequency (NZIF) receiver is in a clipping state; and if yes: determining and storing a first value (RSSI1) representative of the energy of a received signal demodulated by the Near Zero Intermediate Frequency (NZIF) receiver using a first intermediate frequency (IF1); determining and storing a second value (RSSI2) representative of the energy of the received signal demodulated by the Near Zero Intermediate Frequency (NZIF) receiver using a second intermediate frequency (IF2) corresponding to the opposite value of the first intermediate frequency (IF1), selecting the intermediate frequency corresponding to the lowest value of said first and second values.

The present invention relates to a software-defined radio chip or module suitable for integration on a host device. The software-defined radio chip comprises digital signal processing capability which includes standard digital signal processing hardware and reconfigurable programmable logic, the reconfigurable programmable logic is configured in such a way as to provide secure digital signal processing capability to the software-defined radio, thereby providing a secure software-defined radio.

A method and terminal device for executing a radio application is disclosed. The method for executing a radio application is a method for executing a radio application independent of a modem in a terminal device, comprising the steps of: communicating with each other using a reconfigurable radio frequency interface (RRFI) by a unified radio application (URA), which operates on a radio computer of the terminal device, and a radio frequency (RF) transceiver, which operates in a radio platform on the radio computer; and supporting, by the RRFI, at least one service among a spectrum control service, a power control service, an antenna management service, a transmission/reception chain control service, and a radio virtual machine protection service.

A multi-channel, multi-band system for wireless communication includes a radio frequency (RF) front end, a mixed-signal front end for converting an incoming analog RF signal into an incoming digital RF signal and converting a composite outgoing digital RF signal into an outgoing analog RF signal, a summation circuit for combining multiple outgoing digital RF signals to the composite outgoing digital RF signal, and multi-band transceivers. Each of the multi-band transceivers may process the incoming digital RF signal to provide an incoming baseband signal and process an outgoing baseband signal to provide an outgoing digital RF signal. The mixed-signal front end may apply a loading control to each transceiver for adjusting an amount of loading on the transmit path from the transceiver to the mixed-signal front-end. The transceivers may individually conduct a feedback calibration on the receive path to optimize the incoming baseband signal for each band.

In one example, a receiver includes: a low noise amplifier (LNA) to receive and amplify a radio frequency (RF) signal, the LNA having a first controllable gain; a mixer to downconvert the RF signal to an intermediate frequency (IF) signal; a programmable gain amplifier (PGA) coupled to the mixer to amplify the IF signal, the PGA having a second controllable gain; a digitizer to digitize the IF signal to a digitized signal; a digital signal processor (DSP) to process the digitized signal; a first detector to output a first detection signal having a first value in response to the IF signal exceeding a first threshold during a first detection period; and a controller to dynamically update a gain setting of one or more of the LNA and the PGA in response to the first detection signal.

In one example, a receiver includes: a low noise amplifier (LNA) to receive and amplify a radio frequency (RF) signal, the LNA having a first controllable gain; a mixer to downconvert the RF signal to an intermediate frequency (IF) signal; a programmable gain amplifier (PGA) coupled to the mixer to amplify the IF signal, the PGA having a second controllable gain; a digitizer to digitize the IF signal to a digitized signal; a digital signal processor (DSP) to process the digitized signal; a first detector to output a first detection signal having a first value in response to the IF signal exceeding a first threshold during a first detection period; and a controller to dynamically update a gain setting of one or more of the LNA and the PGA in response to the first detection signal.

There is provided a communication receiver comprising: an input for receiving a radio frequency, RF, input signal; and at least one finite impulse response, FIR, discrete time filter, DTF. The at least one FIR DTF comprises: an input circuit comprising an input port for sampling the RF input signal at a sampling frequency that is comparable to the input RF input signal; and N parallel branches, each branch having a set of input unit sampling capacitances, where each unit sampling capacitance is independently selectively coupleable to an output summing node. The input circuit is configured to convert an equivalent input impedance of the at least one FIR DTF around the sampling frequency to a real impedance.

Systems and methods for improving operational efficiency of a radio frequency system, which includes a low noise amplifier coupled to an antenna that generates an analog electrical signal based on received electromagnetic waves. The low noise amplifier includes a positive input transistor with a first drain, a negative input transistor with a second drain, a first data branch coupled between the first and second drains, and a second data branch coupled between the first drain and second drains. The first data branch supplies a first current modulated signal generated based on the analog electrical signal when the radio frequency system expects the received electromagnetic waves to include data indicated using a first communication protocol. The second data branch supplies a second current modulated signal generated based on the analog electrical signal when the radio frequency system expects the received electromagnetic waves to include data indicated using a second communication protocol.