6 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).

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).

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