46 results about "IQ imbalance" patented technology

The invention discloses an IQ imbalance blind calibration method and an IQ modulation demodulator, and the method comprises the steps: determining a regularity judgment condition based on the second-order statistical characteristics of a complex signal under an ideal condition; building an IQ imbalance mathematical model to determine a compensation mode; obtaining a compensation coefficient formula based on the compensation mode, the regularity judgment condition and the step diagonal matrix; substituting the complex signal into a compensation coefficient formula to obtain a high-order LMS dual-channel algorithm model; a nonlinear step size error model is introduced into a high-order LMS double-channel algorithm model. The invention provides a frequency-related square difference operation variable step size IQ imbalance dual-channel high-order blind compensation filtering algorithm without any prior information. Algorithm parameters are adjusted according to signal mismatch caused by phase mismatch and amplitude imbalance of input signals, so that the signals keep an ideal orthogonal relation.

The present invention discloses a zero-IF receiving array IQ imbalance beam-level compensation method, comprising: obtaining a radio frequency signal received by each array element; obtaining M intermediate frequency analog signals; obtaining M baseband analog in-phase signals and M baseband analog quadrature signals; performing A / D sampling on the M baseband analog in-phase signals and the M baseband analog quadrature signals respectively to obtain M baseband digital complex signals; obtaining M receiving channel amplitude and phase error compensation values; performing channel amplitude and phase error compensation and beam weighting compensation on the M baseband digital complex signals of the digital array, and summing the values to obtain a beamformed output complex signal; and utilizing the circular characteristics of the received baseband digital complex signals to estimate and compensate for the IQ imbalance error after beamforming to obtain a final baseband digital complex signal of the digital array. The present invention has the advantages of providing a multi-channel IQ imbalance compensation method that does not require channel-by-channel estimation and compensation for IQ imbalance errors and protects the circular characteristics of communication signals from being destroyed.

The invention discloses a TFDM-PON system correction method and device, and the method comprises the steps: an OLT receives a dual-polarization signal transmitted by an ONU based on time division multiplexing or time-frequency division multiplexing, the dual-polarization signal comprises a target signal sequence corresponding to X / Y polarization, and the target signal sequence is an IQ period complex signal, and an I path and a Q path of the IQ period complex signal are single-tone signals of a first frequency and a second frequency respectively; target parameters including target transmitting and receiving end frequency deviation, IQ time delays of a target transmitting end and a target receiving end and target power deviation among ONUs are calculated based on Fourier transform and frequency domain symmetry of the dual-polarization signals, so that the ONUs carry out frequency, time delay and power correction according to the target parameters. Subcarrier crosstalk caused by frequency offset in TDM uplink burst transmission, mirror image crosstalk caused by IQ imbalance and performance degradation caused by power imbalance between subcarriers are eliminated, the bit error rate is reduced, and the system robustness is improved.

The present invention discloses a method and device for demodulating and analyzing large Doppler frequency shift (OTFS) satellite communications, belonging to the field of satellite communications. The device includes a data acquisition unit, an IQ imbalance calculation unit, an amplitude error calculation unit, a continuous phase signal generation unit, a convolution detection frame header determination unit, two guard slot removal units, two receive reference signal acquisition units, a sampling phase error acquisition unit, two theoretical demodulation reference signal generation units, a channel model extraction unit, a Doppler frequency error calculation unit, a Doppler frequency error elimination unit, a phase error calculation unit, a Doppler phase error elimination unit, a channel estimation unit, an interpolation and smoothing unit, a channel error elimination unit, a Wigner transform unit, a symplectic finite Fourier transform unit, a digital modulation and demodulation unit, and an error vector magnitude (EVM) calculation unit. The present invention can achieve high-precision demodulation and analysis of large Doppler frequency shift (OTFS) orthogonal time-frequency-space modulation (6G) satellite communication signals.

The invention provides a zero intermediate frequency transceiver receiving channel IQ imbalance calibration method, and relates to the field of radio frequency transceiver calibration. In the method, a single-tone calibration signal generator generates a single-tone signal in a self-calibration process; the dual-tone excitation signal synthesizer is used for generating dual-tone excitation signals in the self-calibration process; the radio frequency switch is communicated with the sending channel and the receiving channel in the calibration process, and an excitation signal sent by the sending channel is looped back to the receiving channel; the error extraction unit is used for extracting an IQ error and calculating a compensation coefficient; and the error compensation unit is used for compensating the link signal. According to the method, a dual-tone test signal is generated by a sending channel, and IQ unbalance is extracted and compensated in a receiving channel according to an algorithm provided by the invention. According to the method, a calibration environment does not need to be set up by external equipment, self-calibration of the chip can be realized, and the calibration cost of a single chip can be effectively reduced.

The present application discloses a dynamic power consumption management system, comprising: an equalization algorithm circuit, a carrier recovery algorithm circuit, and an IQ imbalance algorithm circuit; an equalization algorithm coefficient update circuit connected to an output end of the carrier recovery algorithm circuit and configured to provide equalization algorithm update coefficients to the equalization algorithm circuit; a carrier recovery frequency offset and phase noise calculation circuit connected to an output end of the equalization algorithm circuit and configured to provide carrier recovery frequency offset and phase noise coefficients to the carrier recovery algorithm circuit; an IQ imbalance algorithm coefficient update circuit connected to an output end of the IQ imbalance algorithm circuit and configured to provide IQ imbalance algorithm coefficients to the IQ imbalance algorithm circuit; a signal-to-noise ratio reporting circuit connected to an output end of the IQ imbalance algorithm circuit and configured to acquire a signal-to-noise ratio of the entire system; and a management circuit configured to determine the equalization algorithm update coefficients, the carrier recovery frequency offset and phase noise coefficients, and the IQ imbalance algorithm coefficients based on the signal-to-noise ratio. The present application can reduce the power consumption of chips.

This application discloses an IQ imbalance compensation method for WiFi broadband transmitting and receiving paths and application thereof. This application relates to the field of digital signal processing. The method comprises: inputting IQ signals into a frequency-related IQ imbalance compensation device FD-IQMC; the FD-IQMC device first performing frequency-independent overall compensation on IQ imbalance by means of a frequency-independent IQ imbalance compensation module FI-iqmc, and then selecting one signal from the IQ signals and inputting same into a Frac-delay filter and an Amp-FIR filter so as to respectively perform phase and amplitude compensation of frequency-selectivity; and inputting another signal into a delay module to be time-aligned with the selected signal.

The present disclosure provides a method, apparatus, and device for compensating for carrier phase and IQ imbalance of a communication receiver, which can be applied to the field of communication signal processing technology. The method includes: sampling a received signal of a communication receiver to obtain a received signal sequence, wherein the communication receiver includes a transmitter and a receiver, and the receiver processes the transmitted signal from the transmitter to obtain a received signal; calculating the expectation and covariance matrices of the received signal sequence, and constructing a likelihood function corresponding to the received signal sequence based on the expectation and covariance matrices; derivatizing the logarithmic function of the likelihood function to obtain a set of estimation equations corresponding to multiple parameters to be estimated; iteratively solving the set of estimation equations according to a predetermined number of iterations to obtain multiple target estimation parameters corresponding to the multiple parameters to be estimated; and compensating the received signal sequence based on the target estimation parameters to obtain a target signal sequence.

The application discloses a wideband quadrature calibration method and device of a radio frequency transceiver and the radio frequency transceiver, relates to the technical field of radio frequency transceivers, and comprises the following steps: controlling injection of a preset in-band single-tone test signal and a preset local oscillator signal, acquiring an I / Q path in-band power value, calculating a difference value, and compensating the frequency-independent IQ gain imbalance in the digital domain through digital gain compensation. Controlling injection of a preset attenuation point test signal and a local oscillator signal, acquiring an I / Q path cutoff frequency point power value, and combining the I / Q path in-band power value to determine the double-frequency point power difference of the I / Q path. According to the deviation of the double-frequency point power difference of the I / Q path and a target attenuation amount, the cutoff frequency of the I / Q path filter is adjusted respectively, and the frequency-dependent IQ imbalance is calibrated in the analog domain. The application replaces the quadrature calibration signal with a single-tone signal for testing, expands the application scenario, simplifies the wideband IQ balance calculation in the digital domain, and reduces the hardware resource consumption and time delay.

The present disclosure provides a signal processing method, comprising: determining a first parameter set of a second signal based on a first signal; determining a second parameter set of a third signal based on the first signal, the third signal being a feedback signal of the first signal at a second phase shift angle, the second phase shift angle satisfying a first preset condition; determining a first feedback mirror image compensation coefficient and a second feedback mirror image compensation coefficient based on the first parameter set and the second parameter set; and determining a transmission mirror image compensation coefficient based on the first feedback mirror image compensation coefficient, the second feedback mirror image compensation coefficient, and the second signal or the third signal. The method of the present disclosure determines the first parameter set and the second parameter set through two different phase shift angles, and then determines the feedback mirror image compensation coefficient and the transmission mirror image compensation coefficient based on the first parameter set and the second parameter set, thereby improving the convenience and accuracy of the compensation coefficient determination, and without causing changes in the inherent IQ imbalance characteristics.

An apparatus and method to measure nonlinear system noises may include a processor to generate a bilateral notch signal, a unilateral notch signal and a multi-tone signal; to measure power of an additive Gaussian white noise of a nonlinear system by using the multi-tone signal; to measure a first power-to-noise ratio of the nonlinear system by using the bilateral notch signal; to measure a second power-to-noise ratio of the nonlinear system by using the unilateral notch signal. The processor is to calculate a nonlinear power-to-noise ratio of the nonlinear system and a power-to-noise ratio introduced by IQ imbalance according to the power of the additive Gaussian white noise, the first power-to-noise ratio and the second power-to-noise ratio.

A TFDM-PON system correction method and device, including OLT receiving ONU based on time division multiplexing or time-frequency division multiplexing sends double polarization signal, it includes target signal sequence corresponding with X / Y polarization, and target signal sequence is IQ period complex signal and its I road and Q road are single tone signal of first frequency and second frequency respectively;Based on the Fourier transform of double polarization signal and frequency domain symmetry, calculate target parameters including target transceiver frequency offset, target transmitting terminal, receiving terminal IQ delay and target power deviation between each ONU, make ONU correct frequency, delay and power according to target parameters, eliminate subcarrier crosstalk caused by frequency offset in TFDM uplink burst transmission, image crosstalk caused by IQ imbalance and performance degradation caused by subcarrier power imbalance, reduce bit error rate, improve system robustness.

The invention provides a closed-loop calibration system and method for IQ imbalance, and relates to the technical field of communication, the system comprises a digital transmitter, a power amplifier, a low noise amplifier and a digital receiver which are connected in sequence, and further comprises a digital correlator, a resolving unit, a phase controller and an IQ imbalance compensator; and the power amplifier is connected with the low-noise amplifier through a coupling loop. According to the invention, the analog phase and the digital phase of the loop are adjusted through the phase controller, and the simultaneous calibration of IQ imbalance in the digital transmitter and the digital receiver is realized by combining the four cross-correlation operation of the digital correlator and the parameter joint estimation of the calculation unit without a phase shift module. Phase switching can be realized by using an existing tuning capacitor of a power amplifier or a low-noise amplifier, the design is simple, and a coupling loop is close to an antenna port, so that the calibration precision is not easily influenced by interference and radiation of an internal radio frequency module; and meanwhile, hardware is easy to realize, the complexity is low, the estimation precision is high and the stability is strong.

The invention discloses an individual identification method for communication radiation sources based on receiver distortion compensation, including: constructing a reference receiver and a receiver to be compensated; training a compensation module according to signals of the two to learn distortion differences; performing preliminary compensation on signals of the receiver to be compensated; performing residual IQ imbalance compensation on the preliminarily compensated signals; and completing individual identification of communication radiation sources based on the compensated signals. The method effectively eliminates hardware distortion of receivers and improves the accuracy and robustness of identification in cross-receiver scenarios.

The invention provides an IQ imbalance calibration method and system for an ultra-wideband system, an electronic device, a computer storage medium and a program product. The method comprises the following steps: selecting a plurality of frequency points in a system bandwidth; for each frequency point, respectively generating a first source signal and a second source signal at a transmitting end and performing phase rotation to obtain a first calibration signal and a second calibration signal with a fixed phase difference; respectively sending the first calibration signal and the second calibration signal from the transmitting end to the receiving end through a feedback loop; receiving and processing the first and second calibration signals at a receiving end, respectively, to obtain first and second observation signals; and correlating the first and second observation signals with the first and second source signals, respectively, to obtain first and second correlation coefficients; estimating an actual fixed phase difference based on the first and second correlation coefficients of the plurality of frequency points; determining an IQ imbalance coefficient of each frequency point based on the actual fixed phase difference; and compensating the IQ imbalance of the system based on the IQ imbalance coefficients of the plurality of frequency points.

The application relates to the technical field of wireless communication and digital signal processing, and discloses a modulation signal transceiving system and method based on IQ domain maximum ratio combining, specifically, a Delta-Sigma modulation technology is used at a transmitting end to convert a high-order modulation signal into a low-bit stream, and the precision requirement of a data converter is significantly reduced; an IQ domain maximum ratio combining mechanism is introduced at a receiving end, after IQ imbalance is corrected through digital preprocessing, dynamic weighted combining is carried out according to the signal-to-noise ratios of all receiving branches, and diversity gain is effectively utilized. Through the collaborative design of the transmitting end and the receiving end, the signal-to-noise ratio of the combined signal can be significantly improved under the conditions of high frequency and long distance transmission, the influence of channel fading and noise can be effectively inhibited, and thus the demodulation reliability and the overall robustness of the system can be greatly enhanced on the premise that the noise shaping characteristics of the Delta-Sigma modulation signal are not damaged.

The application relates to the technical field of optical fiber communication, and provides an IQ imbalance estimation method and system, which comprises the following steps: extracting a pair of IQ sampling data of a current clock cycle according to a preset rule; combining phase-compensated IQ sampling data of a previous clock cycle to perform amplitude compensation on the IQ sampling data of the current clock cycle, so as to obtain amplitude-compensated IQ sampling data of the current clock cycle and an amplitude compensation estimation value; combining the amplitude-compensated IQ sampling data of the current clock cycle and the phase-compensated IQ sampling data of the previous clock cycle to perform phase compensation on the IQ sampling data of the current clock cycle, so as to obtain phase-compensated IQ sampling data of the current clock cycle and a phase compensation estimation value; and performing compensation correction on input IQ data according to the amplitude compensation estimation value and the phase compensation estimation value. The amplitude compensation estimation value and the phase compensation estimation value are iteratively accumulated by calculating the amplitude compensation estimation value and the phase compensation estimation value through each pair of IQ sampling data, so that the requirement for hardware is reduced.

The embodiment of the invention provides an IQ imbalance calibration method and device, a signal transmitter and a zero intermediate frequency transceiver, and the method comprises the steps: obtaining a reference baseband signal and a radio frequency signal outputted by an IQ modulation channel based on the reference baseband signal, and converting the radio frequency signal into a modulation baseband signal; reconstructing the modulation baseband signal to generate a baseband feedback signal used for representing distortion of the IQ modulation channel; based on the reference baseband signal and the baseband feedback signal, obtaining a pre-distortion parameter for compensating IQ imbalance; performing pre-distortion processing on the reference baseband signal by using the pre-distortion parameter to generate a baseband pre-distortion signal; and based on the baseband pre-distortion signal, performing imbalance calibration on an IQ modulation channel. As the IQ modulation channel is calibrated, the image rejection ratio and error vector amplitude performance of the output signal can be improved, and the calibration precision of the IQ modulation channel is improved.

The invention discloses an IQ imbalance calibration method and system. The method comprises pre-calibration and fine calibration. During pre-calibration, firstly, M frequency points are selected in a sectional mode, narrow-band calibration is carried out, correlation factors of amplitude imbalance errors and phase imbalance errors of the multiple frequency points are obtained, interpolation fitting is carried out on zero frequency points, and frequency response characteristics in the whole bandwidth are obtained. On the basis, a solution equation is constructed to calculate a filter coefficient, and a filter is designed to compensate the IQ imbalance error. During fine calibration, based on the least square method, the compensation coefficient of the filter is calculated in a real-time and self-adaptive manner, whether iteration is updated or not is judged, iterative filtering is carried out to enhance the stability of the system, and the problem of calibration performance deterioration caused by environmental factors such as temperature change is effectively solved. Compared with traditional narrowband calibration, the calibration system combining pre-calibration and fine calibration has a calibration effect on receiver large-bandwidth IQ imbalance, the adaptive capacity of the calibration system to environment temperature changes is enhanced, and the calibration precision and robustness are improved.

This invention discloses a method and system for suppressing distributed co-channel interference in a region-coexisting environment. The method includes: a desired signal node generating a desired signal and transmitting it through an antenna; distributed interference nodes generating interference signals and transmitting them through antennas; authorized receiving nodes receiving and processing the signals to obtain the down-converted received signal; converting the received distributed interference signal into real and imaginary parts, expanding it with respect to time error and residual frequency offset to obtain the interference signal expression after expansion with time error and residual frequency offset; merging the time-invariant coefficients before the real and imaginary parts of the interference signal into one term to obtain the reconstruction coefficient expression of the distributed interference; estimating the coefficients of the distributed interference suppression system model; reconstructing the interference signal; performing distributed interference suppression; and obtaining the desired signal. This invention achieves the reconstruction and suppression of distributed interference signals under constraints of time error, frequency offset, and IQ imbalance.

The invention relates to the technical field of radio frequency signal processing, and discloses an IQ imbalance joint correction method and device for a multi-carrier signal. The method comprises the following steps: constructing a frequency mirror dual-channel driven IQ imbalance model; estimating an unbalance parameter through a least square method and LMS iteration; constructing a complex domain IQ compensation matrix to compensate each subcarrier one by one; and outputting the corrected multi-carrier complex base signal according to the frequency domain sequence. In the prior art, only a static IQ model or a single-point compensation mode is relied on, and especially in the scenes of temperature drift drift, obvious image frequency coupling, dynamic front-end gain change and the like, stable and effective full-band IQ joint correction cannot be realized. Due to the fact that a dynamic modeling mechanism cooperatively driven by frequency spectrum energy sensing and image frequency leakage estimation is introduced, accurate tracking and low-complexity deployment of time-varying IQ imbalance are achieved, and therefore the multi-carrier signal demodulation precision and the anti-interference capacity are remarkably improved.

The invention provides a mirror image-based IQ calibration method and system for an integrated tester, and the method comprises the following steps: carrying out the IQ imbalance calibration: enabling the integrated tester to calibrate the IQ imbalance of the integrated tester based on an IQ method, and obtaining a calibration result of the IQ imbalance; and signal compensation: when the comprehensive tester analyzes the actual signal, compensating the received and transmitted signal based on the calibration result so as to counteract the influence of the mirror image IQ of the comprehensive tester on the signal. The method has the beneficial effects that the received signal can be compensated when the comprehensive tester analyzes the actual signal, and the effect of counteracting the influence of the mirror image IQ of the local oscillator on the signal is achieved.

The application discloses an IQ imbalance mirror suppression method of a zero intermediate frequency receiving array, and comprises the following steps: calculating a radio frequency signal received by each array element; obtaining M radio frequency signals after phase shifting; obtaining M intermediate frequency signals output by mixing and filtering; obtaining M baseband analog in-phase signals and M baseband analog quadrature signals; the M baseband analog in-phase signals and the M baseband analog quadrature signals are respectively subjected to A / D sampling to obtain M baseband digital complex signals; before beam synthesis of a digital array, amplitude and phase consistency of M receiving channels is calibrated to obtain M receiving channel amplitude and phase error compensation values; the M baseband digital complex signals of the digital array are subjected to channel error compensation and beam weighting compensation, and summation is performed to obtain a final beam forming output complex signal; the application has the advantages that the IQ imbalance mirror suppression capability of a multi-channel zero intermediate frequency receiving digital array is improved.

The invention relates to the technical field of wireless communication and digital signal processing, and provides a modulation signal receiving and transmitting system and method based on IQ domain maximum ratio merging, and particularly, a Delta-Sigma modulation technology is adopted at a transmitting end, a high-order modulation signal is converted into a low bit stream, and the precision requirement for a data converter is remarkably reduced; an IQ domain maximum ratio merging mechanism is introduced at a receiving end, after IQ imbalance is corrected through digital preprocessing, dynamic weighted merging is carried out according to the signal-to-noise ratio of each receiving branch, and diversity gain is effectively utilized. Through collaborative design of the transmitting end and the receiving end, the signal-to-noise ratio of a combined signal can be remarkably improved and the influence of channel fading and noise can be effectively suppressed under high-frequency and long-distance transmission conditions, so that the signal-to-noise ratio of a Delta-Sigma modulation signal can be effectively improved on the premise of ensuring that the noise shaping characteristic of the Delta-Sigma modulation signal is not destroyed, and the signal-to-noise ratio of the Delta-Sigma modulation signal can be effectively improved. And the demodulation reliability and the overall robustness of the system are greatly enhanced.

The invention provides an IQ imbalance compensation method, which is executed by an electronic device, and comprises the following steps: carrying out direct current component removal processing on a first IQ signal of a CIR signal to obtain a second IQ signal, the IQ signal comprising an I signal and a Q signal; sliding on the second IQ signal through a window, for each window position in a plurality of window positions, acquiring an envelope value of a second IQ signal segment in the window, and determining amplitude ratio estimation of a second I signal segment and a second Q signal segment in the window according to the envelope value; and compensating the second Q signal according to the amplitude ratio estimation determined by each window position. According to the scheme disclosed by the invention, high-accuracy IQ imbalance compensation is realized, and the accuracy of phase estimation of the moving object by the CIR is ensured.

The application relates to a method, device, medium and equipment for calibrating ultra-wideband unevenness and IQ imbalance, wherein the method comprises the following steps: receiving a single-tone signal at equal frequency intervals, and performing filtering processing on the single-tone signal to obtain a first single-tone signal; performing windowing processing and frequency domain conversion on the first single-tone signal to obtain a second single-tone signal; obtaining peak points of the second single-tone signal IQ two-way in the corresponding frequency domain, determining IQ phase imbalance information and IQ amplitude imbalance information according to the phases and amplitudes of the peak points; establishing an imbalance signal according to the IQ phase imbalance information and the IQ amplitude imbalance information; establishing a local standard signal, calculating the coefficient of an equivalent filter based on the imbalance signal and the local standard signal by using a least square method, and performing filtering on the single-tone signal according to the coefficient of the equivalent filter, so as to calibrate the ultra-wideband unevenness and the IQ imbalance. The application has the effect of effectively calibrating the ultra-wideband unevenness and the IQ imbalance of a receiver.

The present invention discloses a data processing method for a zero-IF receiving digital array channel, comprising calibrating the data of the zero-IF receiving array channel and performing multi-beam synthesis on the data of the zero-IF receiving array channel. The calibrating the data of the zero-IF receiving array channel comprises: subjecting a single-frequency calibration signal received by each array element to pre-selection filtering, low-noise amplification, in-phase and quadrature mixing, low-pass filtering, and A / D acquisition in each channel of the zero-IF receiving array to obtain baseband digital complex signals of M receiving channels; using the baseband digital complex signals of the M receiving channels to estimate and compensate for IQ imbalance errors of each channel to obtain complex signals after IQ imbalance errors are compensated; and calculating a normalized channel error compensation value. The present invention has the advantages of improving the image suppression capability of the array channel, occupying little memory space, and being suitable for small-scale arrays.

The invention discloses a received signal processing method and device, a method for realizing AoA estimation and UWB equipment, and the method comprises the steps: employing a received signal obtained through low-intermediate frequency receiving, eliminating the phase change introduced by intermediate frequency offset in the received signal, and carrying out the AoA estimation of the received signal; and accumulation processing is carried out on the received signal of which the phase change introduced by the intermediate frequency offset in the received signal is eliminated, so that the influence of IQ imbalance in the received signal is effectively suppressed by an obtained signal accumulation result, and the capability of suppressing a mirror image frequency signal by a system is improved.

The invention discloses an IQ imbalance estimation and compensation method based on a constellation diagram, and belongs to the technical field of wireless communication signal processing. The method comprises the following steps: preprocessing a received signal, including frequency offset compensation, power normalization, matched filtering, symbol synchronization and phase correction; extracting constellation points of the demodulated signals, and mapping the constellation points to ideal constellation points; respectively constructing an amplitude error function and a phase error function, and estimating an IQ amplitude imbalance factor and a phase imbalance factor with high precision by using a least square method; and finally, compensating a received signal by using the estimated factor, and correcting a distorted constellation diagram. The core of the method is that low-complexity and high-precision IQ imbalance blind estimation and compensation can be realized only by using demodulated constellation point information without depending on a training sequence or pilot frequency, the bit error rate of the system is effectively reduced, and the method is particularly suitable for burst communication and high-order modulation systems.