11 results about "Binary modulation" patented technology

The disclosure deals with system and method for discerning the radius maximizing reliability for binary modulation on conjugate-reciprocal zeros (BMOCZ) implemented with both a maximum likelihood (ML) and direct zero-testing (DiZeT) decoder. The optimal radius for BMOCZ is disclosed to be a function of the employed decoder. The radius maximizing the minimum distance between polynomial zeros does not maximize the minimum distance of the final code. While maximizing zero separation offers an almost optimal solution for the DiZeT decoder, the ML decoder outperforms the DiZeT decoder in both additive white Gaussian noise (AWGN) and fading channels when the radius is chosen to maximize codeword separation. Different sequence-to-subcarrier mappings for BMOCZ-based orthogonal frequency division multiplexing (OFDM) are analyzed to highlight a flexible time-frequency mapping approach that avoids distortion introduced by a frequency-selective channel at the expense of higher peak-to-average power ratio (PAPR).

The present invention discloses a system and method for compensating the optical path power of a fiber optic gyroscope using a binary modulation depth method, and belongs to the technical field of fiber optic gyroscopes. The system includes a fiber optic gyroscope closed-loop system and a signal processing circuit. In the signal processing circuit, the photocurrent signal detected by the photodetector is amplified and converted into a digital signal. In the FPGA digital logic circuit, the signal is modulated using a binary modulation depth method, and the optical path power and angular velocity in the digital signal are demodulated using a digital operation method. The generated feedback signal is fed back to the current control port of the wide-spectrum light source and the phase modulator of the Y-waveguide integrated optical chip. The present invention uses a shared A / D detection channel for optical path power compensation and fiber optic gyroscope angular velocity detection, eliminating the need for an additional optical power detection module. Real-time compensation of the optical path power of the fiber optic gyroscope can be achieved without affecting the performance and size of the fiber optic gyroscope, thereby increasing the reliability and stability of the fiber optic gyroscope.

Embodiments of the present application relate to the field of digital signal processing, and disclose a radar digital signal compression and decompression method and circuit, an electrical device and a terminal. In the present application, a plurality of pulse sequences from a plurality of channels are obtained, a periodic binary modulation sequence corresponding to each channel is adopted, and the pulse sequences of the corresponding channels are digitally modulated and accumulated to obtain compressed radar digital signals. The period of the binary modulation sequence corresponding to each channel is a divisor of the total number of pulses in a frame. There are at least two binary modulation sequences satisfying the following constraint conditions: the periods of the binary modulation sequences corresponding to any two channels are different and are in a factor relationship, and are orthogonal within the least common multiple of each other's period, so that the storage overhead of the radar system is reduced without losing signal accuracy, reducing signal quality, or increasing additional cost.

The invention provides an amplitude hologram generation method based on deep learning and camera closed loop. The method comprises the following steps: firstly, acquiring light field intensity information of a to-be-reconstructed target, and generating an initial amplitude type hologram according to modulation characteristics of a spatial light modulator; the amplitude hologram is loaded to a modulator, reconstruction is achieved through optical diffraction, and a reconstructed image is collected in real time through a camera; constructing a loss function based on the deviation between the reconstructed image and the target image, performing camera closed-loop optimization on the hologram through an end-to-end gradient backhaul mechanism, and realizing the derivability of the binarization process by adopting a micro-approximation function under the condition that the binary modulation is not derivable; and training a deep learning network by using a propagation model obtained by closed-loop optimization, so that the network can quickly predict a high-quality amplitude hologram. The method compensates non-ideal deviation of an optical system while suppressing speckle noise and conjugate image interference, is suitable for holographic display of monochromatic and colorful and two-dimensional and three-dimensional scenes, and has the advantages of high reconstruction quality, efficient optimization, strong adaptability and the like.

The present application relates to optical precision measurement technology, and is a kind of nanometer displacement measurement device and method based on far-field high-frequency wave.The measurement device comprises a spatial light modulator and a sharp edge diffraction device;the spatial light modulator is used to load a phase diagram and generate a light field with non-uniform phase distribution;the sharp edge diffraction device has an axisymmetric geometric distribution of sharp edge diffraction structure and is used to induce far-field high-frequency diffraction wave;the sharp edge diffraction device performs binary modulation on the light field incident thereon to induce high-frequency diffraction wave with axisymmetric geometric distribution, and the high-frequency diffraction wave is superimposed in far field to form subwavelength period interference fringes;the light field incident on the sharp edge diffraction device forms light fields with phase difference on both sides of the symmetry axis of the sharp edge diffraction structure;the spatial light modulator is used to modulate the phase difference change to regulate the propagation behavior of the high-frequency diffraction wave, so that the interference fringes are displaced.The present application uses the interference fringes as a kind of scale line to measure the target to be measured, and realizes nanometer displacement measurement.

The invention relates to a telemetry system (1) for a motor vehicle, the system comprising: a first transmitting module capable of transmitting a first light beam (F1a) modulated by a first modulation sequence (Seqa); a second emission module (2b) capable of emitting a second light beam (F1b) modulated by a second modulation sequence (Seqb); a receiving module (3) capable of receiving the light beam (F2) and extracting a demodulation data sequence (Seq2) therefrom; a computing unit (4) arranged to generate a first pseudo-random binary modulated data sequence and a second pseudo-random binary modulated data sequence (Seqa, Seqb), the peak (P) of the cross-correlation function (Fcorr) of which is below a threshold value (Vs), and the computing unit is arranged to estimate a value of a correlation function (Fcorr) between the demodulated data sequence (Seq2) and the first modulated data sequence (Seqa).

The embodiment of the invention provides a target detection method and device, electronic equipment and a storage medium, and relates to the technical field of radar signal processing. The method comprises the following steps: acquiring a plurality of transmitted echo signals of the millimeter wave radar; performing one-dimensional fast Fourier transform, two-dimensional fast Fourier transform and non-coherent accumulation on the echo signal to obtain RD data, and performing target detection on the RD data to obtain target RD data of each target; for each target, according to a position rule between an empty sub-band corresponding to a preset binary modulation mode and a spectral peak sub-band corresponding to each transmitted signal, determining a spectral peak parameter of each transmitted signal corresponding to the target RD data of the target as a signal demodulation result of the target; and for each target, determining a detection result of the target based on the signal demodulation result of the target. Therefore, a better radar detection effect can be achieved under the condition that the equipment cost is not increased.

This application relates to thermometer encoding for driving non-binary signals. A set of drivers can be used to drive signal lines, each of which is calibrated to have a different individual drive strength. Additional individual drivers from the set can be used to drive the signal lines to a continuous voltage according to a non-binary modulation scheme. The different drive strengths of the individual drivers in the set can be scaled non-linearly, which can counteract the non-linearity associated with the individual drivers when the additional individual drivers in the set are activated.

The application provides an image defogging method based on a hybrid attention encoder, adopts a hybrid attention encoder to perform feature extraction on an input fog image; then performs matching on the extracted fog image features and a discrete codebook prior; then decodes the matched features; and finally performs feature embedding on the decoder features to obtain a defogging result step by step. The hybrid attention encoder based on the Transformer and the channel attention mechanism is proposed to enhance the expression ability of the network for local information; meanwhile, the discrete codebook prior is introduced to further enhance the texture details of the defogging result, and the binary modulation mechanism BMM is proposed to guide the matching process of the prior.

The invention relates to an optical precision measurement technology, in particular to a nanometer displacement measurement device and method based on far-field high-frequency waves. The measuring device comprises a spatial light modulator and a sharp edge diffractometer. The spatial light modulator is used for loading a phase diagram and generating a light field with non-uniformly distributed phases; the sharp-edge diffractometer is provided with sharp-edge diffraction structures which are geometrically distributed in an axial symmetry manner and is used for inducing far-field high-frequency diffraction waves; the sharp edge diffractor carries out binary modulation on a light field incident on the sharp edge diffractor, high-frequency diffracted waves in axisymmetric geometric distribution are induced, and the high-frequency diffracted waves are coherently stacked in a far field to form interference fringes of a sub-wavelength period; a light field incident to the sharp-edge diffractometer forms light fields with phase difference in regions on two sides of a symmetry axis of the sharp-edge diffraction structure; the phase difference change is modulated through the spatial light modulator to regulate and control the propagation behavior of the high-frequency diffracted waves, so that the interference fringes are displaced. According to the invention, the interference fringes are used as scale lines to measure the to-be-measured target, and nanometer displacement measurement is realized.

To provide a transmission method and a reception method of a binary signal for achieving high-speed transmission of radio communication.SOLUTION: A method of transmitting a binary signal using a microwave, comprising the steps of: branching a carrier oscillator output signal from a transmission side into two signals; and transmitting from an antenna a binary modulation signal in which one of the two signals is a signal obtained by passing bit 1 of transmission data by cutting only one wavelength or two or three wavelengths of a superimposed carrier by a transfer gate and is a carrier bit 1 signal of a signal added to the other carrier signal with a phase of the carrier matched.SELECTED DRAWING: Figure 2