10 results about "Hierarchical modulation" patented technology

The invention discloses a signal layered transmission method and device, electronic equipment and a storage medium, and is used for solving the technical problems that an MR-M-DCSK system based on a two-dimensional star map has no dimension gain, and is relatively low in spectrum efficiency and relatively low in dynamic adjustment flexibility. Comprising the following steps: converting a high-priority layer data stream into a first bit sequence, and converting a low-priority layer data stream into a second bit sequence; inputting the first bit sequence and the second bit sequence into a three-dimensional constellation-based M-DCSK layered modulator, and outputting a modulation signal; converting the modulation signal into a receiver input signal through a multipath Rayleigh fading channel; the M-DCSK layered demodulator based on the three-dimensional constellation demodulates an input signal of the receiver into a high-priority demodulated output data stream and a low-priority demodulated output data stream; the high priority demodulation output data stream is converted into a high priority layer decoding bit stream, and the low priority demodulation output data stream is converted into a low priority layer decoding bit stream.

The invention belongs to the technical field of robot assembly, and relates to a multi-sensor information hierarchical modulation and fusion method, system and device for robot assembly and a medium. The method comprises the following steps: firstly, performing feature extraction on preprocessed multi-sensor data, and then fusing preprocessed ontology information and force sense information and feature vectors of contact area, contact center position, contact direction and assembly gap area after feature extraction to form a state space input vector S; training the state space input vector S, then outputting an original action instruction vector, and finally modulating and fusing the original action instruction vector, the tactile capture state feature vector after feature extraction and the visual relative pose feature vector to generate an assembly action instruction A; according to the method, the problems that a multi-sensor fusion mode is single in hierarchy, reinforcement learning action lacks safety constraint and vision and learning decision collaboration is insufficient are solved, and the safety, the alignment precision and the assembly efficiency of the robot in complex and precise assembly are remarkably improved.

The application discloses a kind of OFDM-PON bits and power loading method based on layered modulation, belong to passive optical network field.The application includes: based on the signal-to-noise ratio between each branch optical network unit and optical line terminal in OFDM-PON, each optical network unit is grouped;Low-order quadrature phase modulation modulation format is used as base layer in the optical network unit group with low signal-to-noise ratio, high-order quadrature amplitude phase modulation-16 and quadrature amplitude phase modulation-64 modulation format are used as enhancement layer in the optical network unit group with high signal-to-noise ratio;The trough point of the frequency selective fading of each group optical network unit in OFDM-PON is calculated;According to bit allocation method, power allocation method is carried out for bit allocation and power allocation of base layer and enhancement layer.The application realizes the maximum utilization of flexible OFDM-PON in channel condition by simple and easy-to-implement algorithm, to realize the increase of overall OFDM-PON system capacity, satisfy future optical access network to the full use of channel power abundance.

This invention discloses a method and system for predicting the transmittance of flexible glass based on neural networks and enzyme optimization algorithms. The method includes: acquiring component data, multi-stage process parameters, and transmittance data of historical samples of flexible glass; constructing the modulation effect of component data on the process parameters, acquiring optimized component data, and converting it into feature description vectors; establishing a transmittance prediction model using the feature description vectors as input and the transmittance data as output, and introducing an enzyme optimization algorithm to optimize hyperparameters; and inputting the feature description vectors of the component data to be predicted to obtain the predicted transmittance value. This method achieves differentiated hierarchical modulation by constructing different component domains and component feature maps with physical semantics, and optimizes the model through an enzyme optimization algorithm, ensuring the continuity of performance mapping and improving model accuracy and interpretability. It effectively solves the problems of coarse feature representation, submersion of low-dimensional process features, poor interpretability, and low accuracy in existing technologies.

The invention relates to the technical field of electronic component testing, in particular to an annular piezoresistor aging performance testing method based on data analysis. The method comprises the following steps: in a constant-temperature environment, applying an excitation signal consisting of a high-voltage pulse and a high-frequency sinusoidal signal to the annular piezoresistor; synchronously acquiring voltage and current signals, and extracting time-domain thermal characteristics and frequency-domain structural characteristics; calculating the ratio of the time-domain thermal characteristic change rate to the frequency-domain structural characteristic change rate to generate a differentiation index, and executing a hierarchical modulation strategy on the waveform parameter of the high-voltage pulse of the next period based on a numerical interval where the differentiation index is located; and calculating time derivatives of the two types of features in real time, and when absolute values of the two types of features are lower than a preset convergence threshold, terminating the aging test and outputting qualification judgment. According to the invention, by decoupling the thermal effect and the structural damage, the self-adaptive aging screening of the annular piezoresistor is realized, and the accuracy and the safety of the test are improved.

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a first network entity may encode first information using keying modulation. The first network entity may encode the second information using frequency modulated continuous waveform (FMCW) modulation. A first network entity may transmit a communication including a first layer indicating first information and a second layer indicating second information. Numerous other aspects are described.

A system is provided to analyze distortion in an electronic or electromechanical device, which may include testing with one or more modulated signals and / or with one or more demodulators. In one embodiment a change in pitch (or frequency) is measured at an output of the device. One or more signals from a demodulator output may be measured for an amplitude, noise, phase, aliasing, spurious signal, and / or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the device can induce a cross-modulation distortion signal (or time varying cross-modulation distortion signal) from an output of the device. Also utilizing at least one additional filter, filter bank, demodulator and or frequency converter and or frequency multiplier provides extra examination of distortion. Also frequency and / or phase response can be measured with the presence of a de-sensing signal and or another signal that induce near slew rate limiting or near overload condition of the device under test. Another system is provided to analyze modulation index differences between input and output signals for a test signal including modulation. Another system includes providing a nested or layered modulated signal and / or a nested or layered demodulation apparatus or method. Yet another system provides for evaluating for spurious sideband signals via an un-modulated test signal.

The application discloses a kind of photonic terahertz communication systems based on semantic compression and weight hierarchical modulation, the external cavity laser ECL1 of the sending end is connected with IQ modulator, provides continuous optical carrier;IQ modulator is simultaneously connected to TX-DSP module, and the compressed sub-block of image is generated by applying semantic compression method, after weight evaluation, compressed sub-block is modulated to basic layer and additional layer in descending order respectively, and SCHM-QAM constellation point baseband signal is obtained, drive IQ modulator to modulate optical carrier, and be coupled with the continuous light wave that external cavity laser ECL2 outputs, after transmission to amplifier, input to single row carrier photoelectric detector and beat frequency, and terahertz signal is obtained, after receiving end receives terahertz signal and local signal are mixed, and after obtaining base frequency signal, input to RX-DSP module, weight hierarchical demodulation and semantic decompression etc. Operation, and the original data is obtained.The application removes redundant information and improves transmission efficiency, improves system transmission capacity, and guarantees information recovery quality.