115 results about "Phase deviation" patented technology

The invention belongs to the technical field of phase control cabinet phase regulation and control, and particularly relates to a phase control cabinet regulation and control system and method based on multistage phase compensation. According to the method, the voltage waveform and the current waveform output by the phase control cabinet are preliminarily compensated so as to reduce the initial phase deviation, environmental parameters are matched with a pre-stored interference feature library, the type of an interference source can be identified, and the interference source is quantified as a thermal noise contribution value to calculate an interference intensity prediction value in a prediction window, so that the prediction accuracy is improved. And then providing data support for secondary compensation through a phase residual error output by an interference intensity predicted value, determining a compensation gain parameter according to a dynamic error coefficient during secondary compensation, performing secondary compensation on a voltage waveform and a current waveform to enable a phase deviation to be converged to a preset range, and according to the phase convergence information after secondary compensation, determining the interference intensity predicted value according to the phase convergence information after secondary compensation. And the sampling frequency and the compensation weight factor of the sensor array are reversely adjusted to form a closed-loop compensation control link, so that continuous optimization and improvement of the compensation process are realized.

The invention discloses a liquid crystal display screen bright and dark line adjustment optimization method and system and a display screen, and relates to the technical field of liquid crystal display screens, and the method comprises the following steps: constructing a femtosecond resolution synchronous sampling matrix, employing a photoelectric hybrid probe to carry out in-phase collection on driving voltage rising edges of a plurality of sub-channels of the liquid crystal display screen, generating an original waveform database of the multi-channel driving voltage; based on an original waveform database, quantum dot calibration pulses with time marks are injected into all the sub-channels, phase deviation sequences among all the sub-channels are analyzed and extracted through timestamp linkage, and a cross-channel synchronization deviation reference baseline is established. By means of high-precision sampling and difference frequency regulation and control, approximate synchronization of multi-channel driving voltage of the liquid crystal display screen is achieved, accurate recognition is achieved, phase deviation is dynamically corrected, abnormal display phenomena such as frame skipping, ghost shadows and color cast are remarkably eliminated, and visual consistency and display stability in a high-dynamic scene are improved.

The invention discloses a moisture content measuring system and method based on a flexible conformal antenna sensor. Amplitude attenuation and phase deviation can occur when a microwave signal is propagated in a fluid to be measured, amplitude attenuation and phase deviation values are related to the dielectric constant of the fluid to be measured, and the dielectric constant of water at normal temperature is about 78 and is greatly different from the dielectric constant of oil or air. According to the invention, the moisture content information can be obtained by detecting the amplitude attenuation and the phase deviation value under the fixed frequency point. According to the invention, 0-100% full-scale moisture content measurement can be realized. The flexible conformal antenna sensor breaks through the fixed mode that the convex surface of a traditional conformal antenna radiates outwards, the design that the circular patch is embedded in the concave surface is adopted, the direction of a main wave beam is centripetally focused in the radial direction of a pipeline, directional radiation of electromagnetic waves to a to-be-detected fluid pipeline area is achieved, and the energy coupling efficiency between the electromagnetic waves and fluid is improved; and the dielectric property change of the whole watershed of the fluid is detected.

The invention provides an intelligent control method and system for the spinning forming thickness of a tank. According to the method, a spinning tank surface thickness fluctuation signal is collected, and a thickness gradient tensor is generated through time sequence decomposition; extracting a thickness fluctuation intensity value in the tensor and a time sequence lag amount of thickness change of adjacent points to calculate a phase deviation feature; based on the characteristics, the curvature of a laser scanning lens on an annular spinning roller is dynamically adjusted, and a three-dimensional wall thickness cloud picture for identifying the thickness abnormal area is output through focusing and scanning of the tank body; a spinning roller motion track is obtained, thickness change-track space deviation is calculated by associating the thickness abnormal area with the phase deviation characteristics, and a track compensation vector is generated; and according to the vector, a spinning roller feeding path is dynamically optimized, and wall thickness fluctuation caused by material springback is inhibited. Dynamic wave suppression of the wall thickness of the spinning tank is achieved, thickness fluctuation is compressed, and the rejection rate is reduced.

The invention discloses a chromaticity automatic gain control method and device for a composite video signal, and belongs to the technical field of signal processing, and the method comprises the steps: obtaining a chromaticity signal adjusted by a historical chromaticity gain parameter, and demodulating the chromaticity signal from the chromaticity signal to obtain a chromaticity component reference value of a color synchronization signal; calculating an actual color synchronization level and a phase deviation between an input color subcarrier and a local color subcarrier according to the color difference component reference value; in response to the chroma phase deviation meeting a preset chroma phase locking condition, generating a chroma phase locking identifier, and calculating a chroma gain error according to the actual color synchronization level; and determining a chrominance gain control stable identifier according to the chrominance gain error, and determining an output chrominance gain parameter based on the chrominance gain control stable identifier, the chrominance phase locking identifier and the chrominance gain error so as to dynamically adjust the next line of gain through closed-loop control. According to the invention, the influence of long-distance cable transmission on the composite video chrominance signal can be reduced, and the chrominance difference of different transmission distances is reduced.

The invention discloses a multi-path-based low-altitude helicopter communication navigation signal enhancement method and system, and the method comprises the steps: carrying out the precise adjustment of a multi-path signal through a phase calibration algorithm according to the phase deviation value of each path, calculating the phase compensation amount through the fast Fourier transform if the phase deviation value exceeds a preset threshold value, and obtaining a multi-path signal; multi-path signal groups with consistent phases are obtained; the method comprises the following steps of: acquiring a multi-path signal group with consistent phase, performing weighted synthesis on each path signal by adopting a beam forming technology, and aiming at a synthesis efficiency improvement requirement, optimizing an energy concentration ratio in a main signal direction by adjusting a weight coefficient to obtain a primary enhanced main signal waveform; and acquiring coordinate output after the navigation precision is improved, aiming at the phase mismatch problem caused by signal scattering characteristics, adjusting phase calibration parameters by monitoring an environment change trend in real time, and generating enhanced signal data adaptive to a complex environment by adopting a dynamic updating mechanism.

The invention relates to the technical field of post insulator detection, and discloses a post insulator crack detection method and system based on stress wave recursion characteristics, and the method comprises the steps: S1, generating an initial stress wave through a high-energy pulse exciter, and introducing the stress wave into a post insulator; s2, collecting a dynamic response signal of insulator stress wave propagation by using a distributed fiber bragg grating sensor network; s3, carrying out preprocessing on the dynamic response signal; s4, acquiring real-time environment parameters through an environment monitoring sensor; s5, combining material attributes and geometric structures of the post insulators; and S6, outputting recursive quantization features based on the recursive neural network model. According to the method, a stress wave propagation path is dynamically tracked by constructing a recurrent neural network model, multiple reflection characteristics of waves are quantified, abnormal phase deviation is accurately captured based on material attribute physical constraints, and the energy characteristic analysis capability of tiny defects is remarkably enhanced.

There is provided a phase shifter circuit of an optical encoder. The phase shifter circuit receives a first signal, a second signal, a third signal and a fourth signal sequentially having a 90-degree phase shift, and includes a first cascaded resistor string, a second cascaded resistor string, a third cascaded resistor string and a fourth cascaded resistor string. The first, second, third and fourth cascaded resistor strings respectively delay the first, third, second and fourth signals by selecting a switch connected at a tap-out node of the first, second, third and fourth cascaded resistor strings to correct phase deviations between incremental signals and an index signal and / or between incremental signals.

The invention discloses a crystal oscillator taming system based on Kalman filtering and adaptive PID, and relates to the technical field of time-frequency equipment. Comprising a crystal oscillator time frequency module used for generating a local time frequency signal, a reference module used for receiving an external reference time frequency signal, an error measurement module used for measuring the phase deviation between the local time frequency signal and the reference time frequency signal, and a Kalman filtering estimation module used for performing Kalman filtering estimation based on the phase deviation. The Kalman filtering module is used for outputting phase deviation estimation and covariance estimation and adaptively adjusting PID parameters according to the phase deviation estimation, the position deviation estimation and the covariance estimation; the control feedback module is used for superposing the voltage-controlled voltage adjustment quantity to the crystal oscillator time frequency module to adjust the output frequency of the crystal oscillator; according to the method, the crystal oscillator taming parameters are dynamically adjusted through Kalman filtering in combination with self-adaptive PID, high-precision and robust taming of the crystal oscillator is achieved, and the long-term frequency stability and the time synchronization precision of the crystal oscillator are improved.

The invention discloses an oscilloscope sampling waveform data processing method based on reinforcement learning, and relates to the technical field of waveform signal processing, and the method comprises the steps: obtaining a plurality of groups of original waveform signals, including a first waveform signal and a second waveform signal, collected by an oscilloscope based on a pre-configured data collection strategy, extracting waveform features and constructing a multi-dimensional vector matrix; introducing reinforcement learning into the multi-dimensional vector matrix to analyze phase deviation caused by hardware energy consumption, determining an influence weight of the phase deviation on waveform quality, and feeding back and adjusting a data acquisition strategy; based on the adjusted data acquisition strategy, a third waveform signal is obtained, comprehensive characteristic deviation is obtained through Hilbert transform, the comprehensive characteristic deviation is compared with a preset deviation threshold value, and if the comprehensive characteristic deviation exceeds the preset deviation threshold value, a scale disturbance mechanism is introduced, secondary time processing is executed, and the third waveform signal is corrected; according to the invention, the sampling precision is improved.

There is provided a phase shifter circuit of an optical encoder. The phase shifter circuit receives a first signal, a second signal, a third signal and a fourth signal sequentially having a 90-degree phase shift, and includes a first cascaded resistor string, a second cascaded resistor string, a third cascaded resistor string and a fourth cascaded resistor string. The first, second, third and fourth cascaded resistor strings respectively delay the first, third, second and fourth signals by selecting a switch connected at a tap-out node of the first, second, third and fourth cascaded resistor strings to correct phase deviations between incremental signals and an index signal and / or between incremental signals.

The invention relates to the technical field of water gushing monitoring, in particular to a tunnel water gushing dynamic control and safety monitoring method and system based on geological radar, and the method comprises the following steps: in the tunneling mechanical propulsion process, when the oil pressure drop rate exceeds a rate threshold value, determining a tunneling negative pressure period; acquiring a radar waveform dynamic sequence in the negative pressure time period; key feature parameters are extracted from the radar waveform dynamic sequence; marking a region which simultaneously meets the amplitude attenuation mutation rate and the phase deviation cumulant as a water gushing precursor target region; and by taking the water gushing precursor target region as a center, generating a conical diffusion preventive grouting field. According to the method, the dynamic sensing capability of the sudden water bursting risk is enhanced, the space-time continuity expression capability of the abnormal region is improved, and the precursor intensity can be quantitatively distinguished through the thermal value.

The invention relates to the technical field of transcranial alternating current waveform control, and discloses a current waveform control method and system based on transcranial alternating current stimulation, and the method comprises the steps: carrying out the time-frequency analysis of an electroencephalogram signal through short-time Fourier transform; generating an initialized current waveform according to individual neural oscillation characteristics; different stimulation modes are selected according to task requirements to adjust the current waveform; and frequency deviation and phase deviation are calculated through real-time feedback, and the current waveform is dynamically compensated and adjusted. The technical problems that in the prior art, a stimulation method with fixed frequency and amplitude is usually adopted, and particularly under the condition of large individual difference, accurate individualized current waveform control is difficult to achieve, so that the stimulation effect is unstable and poor are solved. Due to the fact that the frequency and the phase of the current waveform can be accurately adjusted according to the actual neural oscillation state of the brain through real-time feedback and the dynamic frequency, the synchronism of stimulation and brain neural oscillation is improved.

The application discloses a kind of calibration method and device for rotary variation soft decoding, calibration method includes: according to N times oversampling frequency respectively sampling rotary variation feedback sine and cosine feedback signal envelope surface and obtaining positive, cosine oversampling signal;Positive, cosine oversampling signal is handled to obtain the zero position offset of rotary variation positive, cosine envelope signal;Positive, cosine oversampling signal is handled to obtain the amplitude of rotary variation positive, cosine envelope surface;Positive, cosine oversampling signal is handled to obtain the phase deviation of rotary variation positive, cosine envelope surface;Through the amplitude, zero position offset, phase deviation obtained by calculation, the envelope surface of rotary variation positive, cosine is compensated, and the signal after compensation is sent into phase-locked loop to obtain the angle and rotational speed information of rotary variation.The application obtains accurate amplitude, zero position offset, phase difference in turn, and then carries out error compensation, finally obtains corrected positive, cosine signal, effectively guarantees the efficiency of motor.

The application discloses a method and equipment for extracting same-frequency aliasing signals in a shear atomic interferometer. The same-frequency aliasing interference signals to be fitted are regarded as simple harmonic signals, fitted effective contrast and fitted effective phase are obtained based on the simple harmonic signals, and the contrast prior value of the first atomic interference signal and the contrast prior value of the second atomic interference signal are obtained by inversion. The same-frequency aliasing interference signals to be solved are regarded as simple harmonic signals, the measured effective contrast and the measured effective phase are obtained based on the simple harmonic signals, the absolute value of the phase deviation of the first atomic interference signal to be solved and the second atomic interference signal to be solved is calculated, and the phase of the first atomic interference signal to be solved and the phase of the second atomic interference signal to be solved are calculated. The application can reconstruct the atomic interference signals from the same-frequency aliasing interference signals to be solved, realizes the restoration of the original signals, and realizes the accurate separation of the atomic interference signals.

A method for operating a time-of-flight camera (20, 20a, 20b) with an illumination device (12, 12a, 12b) and a modulator (30) for emitting modulated transmitted light (S) is described. p1 , S p1a , S p16 ), as well as with a photodetector (21, 21a, 21b) for detecting a modulated received light (S p2 , S p2a , S p2b ) specified, the method comprising performing one or more distance measurement cycles (EMZ) with at least one phase measurement cycle (PMZ, G, Z, F) in which at least two phase measurements (PM) are performed; comprising at least one phase measurement cycle (PMZ, G, Z, F): - the modulation and emission of the transmitted light (S p1 , S p1a , S p1b ) with a modulation frequency (f G , f Z , f F ); - measuring a phase shift between the transmitted light (S p1 , S p1a , Sp1b ) and the receiving light (S p2 , S p2a , S p2b ) for each of the phase measurements (PM) of the phase measurement cycle (PMZ, G, Z, F); - determining a distance value based on the measured phase shift; where, after a phase measurement cycle (PMZ, G, Z, F), a detection phase (D) is provided in which no modulated transmitted light (S) is emitted p1 , S p1a , S p1b ) is emitted; where the detection phase (D) is a time interval Δt D fills and where the time interval Δt D is changed after a number N of distance measurement cycles (EMZ); and wherein an influence by a second illumination device (12b) is detected by a modulated received light (S) during the detection phase (D). BE ) is detected, and a distance measurement value is determined in each distance measurement cycle (PMC).

The invention discloses a three-dimensional sonar phase self-correction method, and relates to the technical field of underwater acoustic engineering and array signal process.The method comprises the steps that a three-dimensional sonar image is generated through sonar original multi-channel signals, a plurality of strong display point targets which can be separated from the three-dimensional sonar image are extracted, and the signal-to-noise ratio of the strong display point targets is higher than a threshold value; sound path distance difference phase compensation is carried out on echo signals of each strong display point target, a channel common phase deviation is estimated by using a compensated residual complex signal, then an image entropy and a target peak value are set as convergence criteria, the criteria are deeply combined with an iterative reweighting mechanism, step-by-step optimization is carried out to obtain the phase deviation estimation precision, and the estimation precision of the channel common phase deviation is improved. And finally, obtaining an optimal inherent phase deviation, and carrying out global phase correction on the multi-channel echo signal by using the optimal inherent phase deviation. According to the invention, real-time online self-correction can be realized, the problem of imaging blur caused by phase inconsistency between channels is effectively compensated, and the contrast ratio of three-dimensional sonar imaging and the target visualization quality are remarkably improved.

The invention relates to the field of phased radars, and discloses an active phased array radar calibration method, which is used for improving the accuracy of actually measured phase data. Comprising the following steps: calculating theoretical excitation phases of radiation units according to an antenna array physical geometric structure and a target beam directional angle; enabling the antenna to sequentially excite the radiation units and collect coupling signals in a single-channel mode, and performing analysis to obtain an actually measured amplitude, a phase and a phase deviation; synthesizing the theoretical excitation phase and the phase deviation to generate an actual emission phase, and constructing a phase compensation lookup table; and after compensation by using the lookup table, measuring the actual directional diagram, and if not, performing fine adjustment. The calibration precision and reliability are improved, and the high-precision detection requirement of the active phased array radar can be met.

The present invention discloses a method and system for QPSK and 8PSK identification and demodulation. The method identifies the modulation type of an input signal, performs M-th power calculation on the input signal according to the modulation type, and calculates the index corresponding to the maximum value of the amplitude spectrum power; calculates the coarse frequency deviation point corresponding to the index and the corresponding compensation signal, calculates the frequency point value corresponding to the maximum value of the phase difference value of the compensation signal, and uses the frequency point value to perform frequency compensation on the input signal to obtain a frequency-free signal; calculates the position of each point of the frequency-free signal on the phase-free standard constellation diagram corresponding to each point on the constellation diagram to obtain a phase-free standard signal; corrects the phase deviation between the phase-free standard signal and the frequency-free signal, takes the average of the corrected phase deviation to obtain the phase deviation to be compensated, and performs phase deviation compensation on the frequency-free signal to obtain a phase-free signal. The modulation type identification of the input signal is automatically completed during the frequency deviation estimation process, and the frequency deviation estimation and phase deviation estimation process have fewer steps and a simpler process.

The invention relates to a cable fault identification method based on a frequency domain reflection method, and belongs to the technical field of detecting faults in a cable by adopting a pulse reflection method in electrical variable measurement. The method comprises the following steps: setting interval time for increasing sine wave signal frequency to divide moments; calculating an initial frequency f0, and transmitting a sine wave signal with the frequency f0 and the phase of 0 degree into the cable; and then calculating the phase offset at each moment, taking four times of the sine wave signal frequency as the lower limit frequency of the frequency domain reflection method at the moment when the phase offset is equal to 180 degrees for the first time, and further carrying out cable fault identification. According to the method, the lower limit frequency of the frequency domain reflection method is accurately set according to the actual characteristics of the to-be-detected cable, so that omission of cable fault key characteristics is avoided, and the identification accuracy is greatly improved.

The application discloses an automatic bandwidth compensation circuit based on phase detection, which comprises a signal main link, a signal copy link, a phase detector, a first amplifier, an amplitude discriminator and a second amplifier. The application can automatically adjust the bandwidth compensation of the signal main link by detecting the phase deviation of the data signals at the output ends of the signal main link and the signal copy link, can guarantee the consistency of the bandwidth and the delay of the circuit under different gains, and can avoid large-scale temperature compensation of the circuit and the super-high design difficulty caused by the sudden change of the device characteristics.

The invention relates to a device and a transmission system for synchronizing symbol clocks during data transmission between a sender and a receiver, the device having an estimation means (30) and a symbol synchronizer (40). An estimation unit (30) receives a first signal (S1) generated by a sender (10) and estimates a phase deviation (POFF) and / or a frequency deviation (FOFF) between a symbol clock of the sender (10) and a symbol clock of a receiver (20) on the basis of the first signal, generates the first signal (S1) on the basis of the symbol clock of the sender, and analyzes and evaluates the first signal in the receiver on the basis of the symbol clock of the receiver. The device (5) initializes the symbol synchronizer (40) on the basis of the evaluated phase deviation (POFF) and / or the evaluated frequency deviation (FOFF). The symbol synchronizer (40) receives a second signal (S2) generated by the sender (10) in order to generate, on the basis of the second signal (S2), an output signal (SO) representing symbols transmitted inside the second signal (S2) synchronized with the symbol clock of the receiver (20).

The application provides a 2*2 beam splitter based on an error compensation structure, an interference unit, an imaging system and a method, the 2*2 beam splitter comprising: a first coupler, a second coupler, a first phase shifter and a second phase shifter; wherein the first phase shifter is connected on an optical path between the first coupler and the second coupler, and the second phase shifter is connected at an input port of the first coupler; the first phase shifter is configured to compensate for a phase deviation of the first coupler caused by a process error by adjusting a phase value of the first phase shifter; and the second phase shifter is configured to compensate for a phase deviation of the second coupler caused by a process error by adjusting a phase value of the second phase shifter. The application solves the problem that a traditional multi-mode interference coupler causes a misalignment of a light splitting ratio due to a process error, and further causes a decline in imaging resolution.

The embodiment of the present disclosure provides a delay-locked loop and a memory, the delay-locked loop comprising: a preprocessing module configured to receive an initial clock signal, preprocess the initial clock signal, output a first clock signal and a second clock signal; a first adjustable delay line configured to receive the first clock signal, adjust and transmit the first clock signal, and output a first target clock signal; a second adjustable delay line configured to receive the second clock signal, adjust and transmit the second clock signal, and output a second synchronization clock signal; and a first adjustment module configured to adjust the phase of the second synchronization clock signal based on the first target clock signal, and output a second target clock signal. In this way, the first adjustment module can correct the phase difference between the first synchronization clock signal and the second target clock signal, and improve the phase deviation between the target clock signals.

This invention relates to the field of optical detection technology, specifically a multifocal parallel phase extraction and alignment system based on a spatial light modulator, comprising: a wavefront modulation module, a parallel detection module, an information extraction module, a parameter calculation module, and a correction and execution module. The wavefront modulation module loads a phase modulation pattern through a spatial light modulator, generating a complex wavefront containing multiple diffraction orders via the objective lens, forming multiple spatially separated detection focal spots on the sample surface. The parallel detection module receives the reflected light signals from each focal spot in parallel through an array detector. The information extraction module analyzes the signals and extracts the phase offset of each focal spot, constructing a mapping set between position and phase offset. The parameter calculation module calculates the tilt angle and field curvature distribution parameters based on this set. The correction and execution module generates a comprehensive correction signal to drive the objective lens or sample stage to perform multidimensional attitude adjustments. This system achieves multifocal parallel detection and synchronous parameter calculation, improving alignment efficiency and accuracy.

The invention relates to an aberrometer (8) for examining an eye (2) and for detecting wavefronts (7), the aberrometer comprising a device (9) having a light source for emitting light beams (1a, 1b) onto at least one scanning point (4a, 4b) of the retina (5) of the eye (2), wherein the device (9) comprises a detection unit (10) for detecting light beams (1a, 1b) reflected by the scanning point (4a, 4b) of the retina (5). The object of the invention is that of specifying an aberrometer by means of which aberrations can be detected particularly reliably and without problems. The invention is characterised in that the device (9) is designed as an OCT device for taking OCT images by means of optical coherence tomography, wherein the detection unit (10) records temporally successive scanning points (4a, 4b) and wherein a processing unit (11) is provided which is arranged in order to determine, from the optical data from the scanning points (4a, 4b), phase deviations in order to describe, by means of approximation on a model function, on the basis of the phase deviations, wavefronts (7) or wavefront deformations.

The present invention relates to an optical frequency detection chip, a demodulation parameter calibration method, and an optical frequency demodulation method. The optical frequency detection chip of the present invention is loaded on a substrate with a first coupler as an input port and a first Mach-Zehnder interferometer and a second Mach-Zehnder interferometer corresponding to the two outputs of the first coupler; the two interferometers each have four outputs, each output is detected by a photodetector, and the four outputs of each interferometer are divided into two pairs, the phase difference between the two interference signals of each pair is 180°, and the phase difference between the two pairs is 90°. The two pairs of signals change with a sine or cosine function, and the change corresponds to the measured optical frequency information. The present invention can measure the optical frequency in real time and quickly, and measure the optical frequency increment with ultra-high resolution. At the same time, the robustness of the chip measurement is improved by calibrating the non-ideal phase deviation of the two 90° mixers.

A high-resolution image transmission system based on optical communication specifically relates to the technical field of image transmission, and comprises a mode multiplexing transmission module configured to modulate a high-resolution image signal into a plurality of orthogonal transmission actual modes, an interference parameter acquisition module configured to acquire actual interference parameters of the actual modes, and a mode multiplexing transmission module configured to transmit the actual interference parameters to the mode multiplexing transmission module. The actual multiplexing efficiency calculation module is configured to calculate actual mode multiplexing efficiency by taking actual interference parameters as a deducting part of interference loss, and the detail transmission capability evaluation module is configured to calculate actual spatial frequency response bandwidth in combination with detail transmission capability influence, and evaluate the actual mode multiplexing efficiency according to the actual spatial frequency response bandwidth. And the dynamic phase adjustment module is configured to calculate a phase modulation gradient adjustment amount and drive the phase modulator to correct a phase deviation of an actual mode in real time until an image transmission balance condition is met. The purpose of stable, undistorted and detail-complete transmission of the high-resolution image is achieved.

The invention provides a space-time WALSH coding method and device under an MIMO channel, and relates to the technical field of communication. According to the technical scheme provided by the invention, the cross-correlation function between the pilot frequency and the local pre-stored sequence is calculated for each transmission path between each transmitting antenna and the corresponding receiving antenna, scalar superposition is carried out on the cross-correlation function of each transmission path to obtain the composite correlation function, and the maximum power point is searched according to the correlation peak of the composite correlation function. And the phase deviation and the frequency deviation are calculated according to the phase deviation and the frequency deviation, so that the mismatching problem of each transmission path in an MIMO (Multiple Input Multiple Output) channel is effectively compensated. The space diversity gain provided by the MIMO channel is fully utilized through maximum ratio combination, and the signal-to-noise ratio of the combined signal is improved. According to the scheme, WALSH code spread spectrum, joint channel estimation, space diversity combining and other technologies are comprehensively utilized, and transmission of control information can be accurately and effectively achieved under an MIMO channel.

The invention provides an optical waveguide element capable of suppressing phase deviation of a differential modulation signal transmitted through an electrode. An optical waveguide element in which two modulation electrodes (E1, E2) for applying a differential modulation signal are disposed on each of two branch waveguides (10) constituting a Mach-Zehnder optical waveguide, each of the modulation electrodes is composed of a plurality of proximity electrodes (PE11-PE22) disposed in a divided manner along the branch waveguide, signal electrodes (LE1, LE2) for transmitting the modulation signal, and bypass electrodes (BE1, BE2) for connecting the proximity electrodes and the signal electrodes, and ground electrodes (G1, G2) are disposed so as to sandwich the two modulation electrodes. A capacity adjustment mechanism (LET11-LET12) for adjusting the phase velocity of a modulation signal transmitted through the modulation electrode is provided between the modulation electrode (E1) and the ground electrode (G1) that are adjacent to each other.