42results about "Angle demodulation by oscillations conversion" patented technology

The current-mode end-to-end signal path includes a digital-to-analog converter (DAC) operating in current mode and an upconverting mixer operating in current mode and operably coupled to the DAC, where analog inputs and analog outputs of the DAC and the upconverting mixer are represented as currents, and the DAC generates a baseband signal.

According to an embodiment, a circuit is proposed for generating rate and quadrature demodulation signals, incorporating unidirectional hysteresis for negative edges. The circuit features a preliminary stage that amplifies the differential sinusoidal signal from gyroscopic proof mass oscillations; a gain stage for boosting this signal with adjustable hysteresis levels; an output stage delivering a full-swing square wave output; and a customizable offset component to deepen the drop in the non-inverting compared to the inverting signal for the third signal's falling edge.

According to an embodiment, a circuit is proposed for generating rate and quadrature demodulation signals, incorporating unidirectional hysteresis for negative edges. The circuit features a preliminary stage that amplifies the differential sinusoidal signal from gyroscopic proof mass oscillations; a gain stage for boosting this signal with adjustable hysteresis levels; an output stage delivering a full-swing square wave output; and a customizable offset component to deepen the drop in the non-inverting compared to the inverting signal for the third signal's falling edge.

[Problem] To achieve demodulation for a multilevel PSK signal with higher reliability. [Solution] A tracking processing unit 45 comprises a phase rotation unit 452, a phase adjustment unit 453, a phase comparison unit 454, and a VCO 451. The phase rotation unit 452 rotates the phases of an I signal and a Q signal in the received signal of a multilevel PSK signal by using a reference signal. The phase adjustment unit 453 makes a phase adjustment by multiplying the phase of the I signal and the phase of the Q signal by an integer, the I signal and the Q signal being outputted from the phase rotation unit 452. The phase comparison unit 454 compares the adjusted phase of the I signal and the adjusted phase of the Q signal. The VCO 451 generates the reference signal by using the comparison result of the phases.

To provide a receiver.SOLUTION: A receiver according to the present invention includes: an I branch including an I branch mixer that down-converts an RF (radio frequency) signal and outputs an I component and an I branch channelization filter that separates a baseband signal from the output signal of the I branch mixer; a Q branch including a Q branch mixer that down-converts the RF signal and outputs a Q component and a Q branch channelization filter that separates the baseband signal from the output signal of the Q branch mixer; a frequency-dependent mismatch estimator that calculates frequency-dependent mismatch between the I branch and the Q branch; and a frequency-dependent mismatch compensation unit that compensates for the frequency-dependent mismatch between the I branch and the Q branch on the basis of the calculation result of the frequency-dependent mismatch estimator.SELECTED DRAWING: Figure 1

A quadrature demodulation imbalance correction method and system for distributed fiber acoustic sensing data. The method comprises : acquiring I / Q signals I0 and Q0 of each observation point on an optical fiber; performing direct-current bias correction on the I / Q signals I0 and Q0 to obtain I / Q signals I1 and Q1 after direct-current bias correction; performing, by using Hilbert transform, amplitude imbalance correction on the I / Q signals I1 and Q1 after direct-current bias correction so as to obtain I / Q signals I2 and Q2 after amplitude imbalance correction; and performing, by using Hilbert transform, phase imbalance correction on the I / Q signals I2 and Q2 after amplitude imbalance correction so as to obtain I / Q signals I3 and Q3 after imbalance correction. By means of the method, I / Q signals can be accurately corrected, and fiber demodulation noise can be accurately and efficiently suppressed, thereby improving the acquisition quality of distributed fiber acoustic sensing data.

A multi-path radio frequency (RF) system includes a reference oscillation circuit, a local oscillation (LO) generator circuit, and mixer circuits. The reference oscillation circuit generates a reference oscillation signal. The LO generator circuit receives the reference oscillation signal, and generates LO signals according to the reference oscillation signal, where a frequency of the reference oscillation signal is a non-integer multiple of a frequency of at least one of the LO signals. The mixer circuits are located on different signal paths, respectively, and used to receive the LO signals from the LO generator circuit, respectively.

The invention relates to a method and a device for converting an analog input signal into a digital output signal, comprising the following steps: feeding the analog input signal to be converted to an input side of an amplitude modulator with carrier suppression in order to obtain a carrier-free amplitude-modulated signal, a phase-modulated signal is obtained by adding a carrier signal offset by 90 DEG, preferably sinusoidal, to an amplitude-modulated signal output by an amplitude modulator by means of an adder, and the phase-modulated signal is fed to a limiter for suppressing interference amplitude modulation in the phase-modulated signal, the signal output by the limiter is fed to a demodulator and the signal output by the limiter is sampled in the demodulator with at least one sampling clock signal, wherein the phase of the at least one sampling clock signal is dynamically changed to achieve an improved resolution.

The invention relates to a receiver system. There is provided a system comprising a plurality of receivers, each receiver comprising a local oscillator configured to generate a local oscillation signal; a primary mixer configured to mix an input signal with a reference signal at a reference frequency to generate a first output signal; a frequency divider configured to divide the reference signal into a second reference signal at a second frequency; and a secondary mixer coupled to the primary mixer and configured to mix the first output signal with a second reference signal at a second frequency. In the first mode, a reference signal of a first receiver in the plurality of receivers is a local oscillation signal from the first receiver; in the second mode, the reference signal is a local oscillation signal from another receiver of the plurality of receivers.

Technologies, devices, systems and methods herein include a system for receiving or transmitting signals. The system includes a radio frequency (RF) port configured to receive or transmit an RF signal including an upper side band (USB) and a lower side band (LSB); a first mixer coupled with the RF port and configured to convert between the RF signal and an image (IM) band and an RF band; and selection architecture, coupled with the first mixer and including a second mixer, the selection architecture configured to output or receive the USB and the LSB based on the RF band and the IM band.

The present invention relates to a method for calibrating a single sideband, SSB, receiver (1), the method (M) comprising: a) adjusting a mutual phase shift (ΔΘ) of I- and Q-signals (I, Q) to a first phase shift value (ΔΘ1); b) feeding a first, a second and a third test signal (S1, S2, S3) having a predetermined phase offset (ΔΦ) to an input (2) to obtain respective SSB signals (R1, R2, R3), and measuring a first and a second phase difference (Δϕ12, Δϕ23) therefrom; c) calculating a first phase error (Eϕ,1) on the basis of the first and second phase differences (Δϕ12, Δϕ23); d) repeating steps a) - c) with a second phase shift value (ΔΘ2) to obtain a second phase error (Eϕ,2); and e) calibrating the SSB receiver (1) by using that one of the first and second phase shift values (ΔΘ1, ΔΘ2) that has yielded the smaller one of the first and second phase errors (Eϕ,1, Eϕ,2).

The invention relates to an input device (B) for a controller (S) or for a measuring device, wherein the input device (B) comprises at least one input circuit (1) to provide at least one digital or at least one analog input for a controller (S) or measuring device, wherein the at least one input circuit (1) comprises at least one phase modulation converter (P), wherein the at least one phase modulation converter (P) comprises: - an amplitude modulator (2) with carrier suppression, to which an input signal (SigA) can be supplied on the input side to obtain a carrierless amplitude-modulated signal (SigAM), - an adder (7) to add a carrier signal (SigT90) shifted by 90° to the carrierless amplitude-modulated signal (SigAM) and to obtain a phase-modulated signal (SigPM), - a limiter (11),to which the phase-modulated signal (SigPM) is supplied and with which interference amplitude modulation in the phase-modulated signal (SigPM) can be suppressed, and - a demodulation device (16) to which the signal (SigBA) output by the limiter (11) can be supplied and sampled therein with at least one sampling clock signal (CLK0-CLK3).

A communication circuit is disclosed. The communication circuit includes a calibration system configured to receive clock signals having first and second clock phases and first and second duty cycles, respectively, wherein the calibration system is further configured to receive input data and to adjust the input data based in part on the input data and in part on the first and second duty cycles to generate adjusted data. The communication circuit further includes a mixer configured to receive the clock signals and to receive the adjusted data, wherein the mixer is configured to generate output data based on the clock signals and the adjusted data, and wherein due to the adjustment of the input data to generate the adjusted data, mismatches in the output data due to the first and second duty cycles being different are reduced.

A communication system comprising a passive quadrature generator directly connected to an in-phase (I) mixer and a quadrature (Q) mixer; an I-LO amplitude detection circuit connected to the passive quadrature generator and connected to the I-mixer, and a Q-LO amplitude detection circuit connected to the passive quadrature generator and connected to the Q-mixer, the I-LO amplitude detection circuit configured to detect an I-LO amplitude, and the Q-LO amplitude detection circuit configured to detect a Q-LO amplitude; and a combining and integrating circuit configured to receive the detected I-LO amplitude and the detected Q-LO amplitude, and to generate an I-LO DC bias voltage for biasing the I mixer and a Q-LO DC bias voltage for biasing the Q mixer.

There is provide a system comprising a plurality of receivers, each receiver comprising a local oscillator configured to generate a local oscillation signal, a primary mixer configured to mix an input signal with a reference signal at a reference frequency to generate a first output signal, a divider configured to divide the reference signal into a second reference signal at a second frequency and a secondary mixer coupled to the primary mixer and configured to mix the first output signal and the second reference signal at the second frequency. In a first mode, the reference signal for a first of a plurality of the receivers is the local oscillation signal from the first receiver and, in a second mode, the reference signal is the local oscillation signal from another of the plurality of receivers.

Various aspects are described herein for frequency dependent residual sideband (FDRSB) cancellation. A network node may measure FDRSB distortion and may calculate thermal noise based at least in part on the FDRSB distortion and a received signal-to-noise ratio (SNR). A network node may identify whether FDRSB cancellation is enabled or disabled at a user equipment (UE) based at least in part on thermal noise, FDRSB, and a modulation and coding scheme (MCS). The network node may send an FDRSB cancellation message indicating the UE to enable FDRSB cancellation or indicating the UE to disable FDRSB cancellation, and the UE may selectively perform FDRSB cancellation based at least in part on the FDRSB cancellation message. This may reduce UE processing resources, UE energy consumption, and latency at the UE's demodulator.

The present invention provides a method and system for correcting quadrature demodulation imbalance in optical fiber distributed acoustic wave sensing data. The method comprises: obtaining I / Q signals I0 and Q0 at each observation point on an optical fiber; performing DC offset correction on the I / Q signals I0 and Q0 to obtain DC offset-corrected I / Q signals I1 and Q1; performing amplitude imbalance correction on the DC offset-corrected I / Q signals I1 and Q1 using a Hilbert transform to obtain amplitude imbalance-corrected I / Q signals I2 and Q2; and performing phase imbalance correction on the amplitude imbalance-corrected I / Q signals I2 and Q2 using a Hilbert transform to obtain imbalance-corrected I / Q signals I3 and Q3. The method provided by the present invention can accurately correct I / Q signals, accurately and efficiently suppress optical fiber demodulation noise, and improve the quality of optical fiber distributed acoustic wave sensing data acquisition.

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may transmit a capability message indicating a capability of the UE to estimate a frequency domain imbalance between an in-phase portion of a transmit chain of a network entity and a quadrature-phase portion of the transmit chain of the network entity. The UE may receive an indication of a coherence bandwidth associated with the frequency domain imbalance based on the capability message. The coherence bandwidth may indicate a number of subcarriers (SC) over which a characteristic of the frequency domain imbalance (e.g., a variation in the amplitude of the frequency domain imbalance) satisfies a threshold. The UE may perform an estimation of the frequency domain imbalance based on the coherence bandwidth. In some examples, the UE may receive a downlink signal from the network entity, and may perform a correction of the downlink signal based on the estimate.

The invention relates to an input device, a controller, a measuring device and a use, the input device for the controller or the measuring device comprising at least one input circuit for providing at least one digital input or analog input for the controller or the measuring device, the at least one input circuit comprising at least one phase modulation converter, the at least one phase modulation converter has: an amplitude modulator with carrier suppression, to the input side of which an input signal can be applied in order to obtain a carrier-free amplitude modulated signal; an adder for adding the carrier signal in the preferred sinusoidal form offset by 90 DEG to the carrier-free amplitude modulation signal to obtain a phase modulation signal; a limiter to which the phase modulation signal is applied, with which interference amplitude modulation in the phase modulation signal can be suppressed; and a demodulator to which the signal output by the limiter is applied, in which the signal output by the limiter is sampled with at least one sampling clock signal.

The invention relates to a method for converting an analog input signal (SigA) into a digital output signal (Sigo), comprising the steps: - the analog input signal (SigA) to be converted is fed to an amplitude modulator (2) with carrier suppression to obtain a carrierless amplitude-modulated signal (SigAM); - a 90° shifted, preferably sinusoidal carrier signal (SigT90) is added in an adder (7) to the amplitude-modulated (SigAM) signal output by the amplitude modulator (2) to obtain a phase-modulated signal (SigPM); - the phase-modulated signal (SigPM) is fed to a limiter (11) by means of which interference amplitude modulation in the phase-modulated signal (SigPM) is suppressed; - the signal output by the limiter (11) (SigBA) is fed to a demodulation device (16) supplied and sampled therein with at least one sampling clock signal (CLK0-CLK3),wherein - the phase of the at least one sampling clock signal (CLK0-CLK3) is dynamically changed to achieve increased resolution. Furthermore, the invention relates to a device (1) for converting an analog input signal into a digital output signal.

Methods, systems, and devices for wireless communication are described. In some systems, a second network entity (e.g., a transmitting device) may transmit first signaling to a second network entity (e.g., a receiving device) to indicate one or more frequency domain residual sideband (FDRSB) parameters associated with the second network entity. The FDRSB parameters may be associated with an imbalance between an in-phase component and a quadrature phase component of the first signaling. The second network entity may generate and transmit second signaling that is configured to have the one or more FDRSB characteristics. The first network entity may determine whether the second network entity is a source of the second signaling based on the one or more FDRSB characteristics of the second signaling and the one or more FDRSB parameters indicated by the first signaling.

A method and apparatus for mitigating in-phase and quadrature mismatch. A method for optimizing at least one IQMC parameter value for IQMC includes: generating a set of tested IQMC candidate parameter values by performing an iterative method, wherein the iterative method includes: selecting a first IQMC candidate parameter value for the at least one IQMC parameter of the IQMC; using the first IQMC candidate parameter value to determine a performance metric value including at least one of the following: (i) an image rejection ratio (IRR) value, (ii) a signal-to-interference and noise ratio (SINR) value, or (iii) a signal-to-image ratio (SImR) value; and determining a second IQMC candidate parameter value as an update to the first IQMC candidate parameter value. The method for optimizing at least one IQMC parameter value for IQMC also includes: determining an IQMC candidate parameter value from the set of tested IQMC candidate parameter values that optimizes the performance metric value.

A circuit to detect faults in a MEMS device (2) including a mass (3) that oscillates periodically, which receives a position signal (px[n]) formed by a succession of samples of an analog signal (px(t)) that is a function of the position of the mass (3) and has an amplitude and an oscillation frequency. The circuit includes: a reference stage (32) that generates a first reference signal (xref[n]) and a second reference signal (yref[n]) formed by successions of samples of a first sinusoidal signal and a second sinusoidal signal, respectively, with a frequency equal to the oscillation frequency and phase-shifted by 90°; a first multiplier (34) and a second multiplier (36), which generate, respectively, a first product signal (y[n]) and a second product signal (y[n], x[n]) via multiplication of the position signal by the first reference signal and the second reference signal, respectively; a first filter (40) and a second filter (42) of a lowpass type, which filter, respectively, the first and second product signals (y[n], x[n]) and generate a first filtered signal (YLPF[n]) and a second filtered signal (XLPF[n]); an estimator stage (46), which determines estimates of the amplitude, as a function of the first and second filtered signals (YLPF[n], XLPF[n]); and a decision stage (48), which compares the estimates with a range of values and detects the presence of faults on the basis of the outcomes of the comparisons.

There is provide a system comprising a plurality of receivers, each receiver comprising a local oscillator configured to generate a local oscillation signal, a primary mixer configured to mix an input signal with a reference signal at a reference frequency to generate a first output signal, a divider configured to divide the reference signal into a second reference signal at a second frequency and a secondary mixer coupled to the primary mixer and configured to mix the first output signal and the second reference signal at the second frequency. In a first mode, the reference signal for a first of a plurality of the receivers is the local oscillation signal from the first receiver and, in a second mode, the reference signal is the local oscillation signal from another of the plurality of receivers.

The receiver of this embodiment comprises: an I branch mixer that down-converts a radio frequency signal to output an I component and an I branch channelization filter that separates a baseband signal from an output signal of said I branch mixer; and a Q branch mixer that down-converts said RF signal to output a Q component and a Q branch channelization filter that separates a baseband signal from an output signal of said Q branch mixer, a frequency dependent mismatch estimator for calculating a frequency dependent mismatch of said I branch and said Q branch, and a frequency dependent mismatch compensation part for compensating a frequency dependent mismatch of said I branch and said Q branch according to a calculation result of said frequency dependent mismatch estimator.

An input facility for a controller or measurement apparatus includes at least one input circuit for providing at least one digital or at least one analog input for a controller or measurement apparatus, wherein the at least one input circuit includes at least one phase modulation converter that has an amplitude modulator with carrier suppression to which an input signal can be supplied on the input side in order to obtain a carrierless amplitude-modulated signal, an adder for adding a carrier signal shifted by 90° to the carrierless amplitude-modulated signal and for obtaining a phase-modulated signal, a limiter to which the phase-modulated signal is supplied and with which a noise amplitude modulation in the phase-modulated signal can be suppressed, and a demodulation facility to which the signal output from the limiter is supplied and that can be sampled therein with at least one sampling clock signal.

A communication system includes a passive quadrature generator connected directly to an in-phase (I) mixer and a quadrature (Q) mixer, an I LO amplitude detect circuit connected to the passive quadrature generator and connected to the I mixer, and a Q LO amplitude detect circuit connected to the passive quadrature generator and connected to the Q mixer, the I LO amplitude detect circuit configured to detect an I LO amplitude and the Q LO amplitude detect circuit configured to detect a Q LO amplitude, and a combining and integrating circuit configured to receive the detected I LO amplitude and the detected Q LO amplitude and generate an I LO DC bias voltage to bias the I mixer and a Q LO DC bias voltage to bias the Q mixer.

The present disclosure relates to a receiver, comprising: an I-branch including an I-branch mixer that outputs an I component by down-converting a radio frequency (RF) signal, and an I-branch channelization filter that separates a base band signal from an output signal of the I-branch mixer, and an I-branch channel filter that separates the base band signal from the output signal of the I-branch mixer; a Q-branch including a Q-branch mixer that outputs a Q component by down-converting the radio frequency (RF) signal and a Q-branch channelization filter that separates a baseband signal from an output signal of the Q-branch mixer; a frequency-dependent mismatch estimation unit that calculates a frequency-dependent mismatch between the I-branch and the Q-branch; and a frequency-dependent mismatch compensation unit that compensates for the frequency-dependent mismatch between the I-branch and the Q-branch on the basis of the calculation result of the frequency-dependent mismatch estimation unit.

A measurement receiver is used to measure I / Q mismatch, where an RF phase shift is introduced to distinguish between transmitter I / Q mismatch and measurement receiver I / Q mismatch. Joint transmit and receive image calibration of N ≠ 4 N-phase Tx / MRx is performed. A combined communication signal, e.g., an RF signal having in-phase and quadrature components, is received by a receiver stage. A first N-phase baseband reference signal is generated from the received in-phase / quadrature components, where N is an integer equal to 3 or greater than 4. A second N-phase baseband signal is generated from the received in-phase / quadrature components. Mismatch between the first N-phase baseband reference signal and the second N-phase baseband signal is used to generate correction coefficients for the transmitter.

To provide a receiver.SOLUTION: A receiver according to the present invention includes: an I branch including an I branch mixer that down-converts an RF (radio frequency) signal and outputs an I component and an I branch channelization filter that separates a baseband signal from the output signal of the I branch mixer; a Q branch including a Q branch mixer that down-converts the RF signal and outputs a Q component and a Q branch channelization filter that separates the baseband signal from the output signal of the Q branch mixer; a frequency-dependent mismatch estimator that calculates frequency-dependent mismatch between the I branch and the Q branch; and a frequency-dependent mismatch compensation unit that compensates for the frequency-dependent mismatch between the I branch and the Q branch on the basis of the calculation result of the frequency-dependent mismatch estimator.SELECTED DRAWING: Figure 1