196 results about "Pseudo random sequence" patented technology

The invention discloses an image encryption method and system based on a chaotic system, and relates to the technical field of image processing, and the method comprises the steps that the chaotic system is constructed by a cellular automaton and tent mapping combination; performing coordinate scrambling on the coordinate values of the pixel points; all the pixel points form a pixel matrix, and the pixel matrix is traversed to obtain an initial encryption matrix; a pseudo-random sequence is obtained through a chaotic system, the pseudo-random sequence is arranged into a row matrix and a column matrix, the row matrix and the column matrix are subjected to XOR operation, and a plaintext image is converted into a two-dimensional matrix; converting the initial encryption matrix into a two-dimensional encryption matrix; on the basis of a CA model of a cellular automaton, calculating and assigning pixel point values of the initial encryption matrix and the two-dimensional encryption matrix to obtain a target encryption image, and the image encryption method based on the chaotic system can solve the problems that in the prior art, an image encryption method based on the chaotic system is not sensitive to plaintext images, cannot effectively defend differential attacks, is poor in robustness, and cannot effectively defend differential attacks. And the technical problems of periodicity and generally small key space are solved.

The present application relates to the technical field of DNA storage. Provided are a method and apparatus for encryption and coding during DNA storage, and an electronic device and a storage medium. The method for encryption and coding comprises: acquiring data to be stored, and a first random number sequence and a second random number sequence which are generated by a hyperchaotic pseudo-random sequence generator; using the first random number sequence to encrypt the data to be stored, so as to obtain source data; performing DNA Raptor coding on the source data, and introducing the second random number sequence into a DNA Raptor coding process as a random number seed, so as to obtain at least one piece of coded data; and on the basis of a DNA base mapping rule, converting each piece of coded data into a corresponding DNA sequence, and generating a target DNA sequence from the DNA sequence corresponding to each piece of coded data. The present application solves the problem in the related art of data security being not taken into consideration during DNA storage.

Disclosed are an auxiliary pilot adaptive optimization method, apparatus and device, and a medium, which relate to the technical field of wireless communications, and solve the problems of static configuration, resource waste and single function of the existing auxiliary pilot. An auxiliary pilot frequency sequence is designed into a synchronous prefix and an estimation core section, and the synchronous prefix adopts a pseudo-random sequence with high autocorrelation and is used for timing synchronization (positioning through a sequence autocorrelation peak value) and frequency synchronization (calculating frequency offset through a phase difference) in a demodulation process; the estimation core section adopts an orthogonal sequence with a low peak-to-average ratio and is used for accurate channel estimation; the double-segment sequence is connected through a preset code pattern, and it is ensured that a demodulation end can perform synchronous analysis. By sensing the channel state in real time, parameters of the auxiliary pilot frequency are dynamically adjusted, and a synchronization function is fused, so that the demodulation performance and the resource utilization rate are improved.

The invention relates to the technical field of chaotic cryptography, image encryption and information security, in particular to a multi-image encryption algorithm based on a hyper-chaotic system and computer-generated holography, which comprises the following steps: S1, generating a pseudo-random sequence for encryption by using the hyper-chaotic system; s2, preprocessing the original image based on computer-generated holography; s3, combining the generated pseudo-random sequence with the preprocessed image to realize image encryption; s4, through decryption operation corresponding to the encryption process, the original image is restored after the correct secret key is input; and S5, the decryption operation comprises inverse transformation and reconstruction operation on the encrypted image. The algorithm comprises an image preprocessing module, a hyperchaotic system module, a compressed sensing coding module, a computer-generated holographic encryption module, a decryption module and a post-processing module, the security of sensitive image data in the transmission and storage process can be ensured, and efficient and reliable guarantee is provided for sensitive image encryption in various fields.

The invention provides an image encryption method based on chaotic mapping and dynamic positioning generalized knight cruise, and the method comprises the following steps: reading a plaintext image P, and converting the plaintext image P into a pixel matrix with the size of the plaintext image P; a chaotic pseudo-random sequence is generated through three-dimensional Logistic chaotic mapping, and three integer pseudo-random sequences are obtained through integer processing and serve as parameters of a pixel matrix for a knight cruise scrambling method; two of the obtained integer pseudo-random sequences are used for controlling cruising of a rider on rows and columns respectively, so that scrambling operation is completed; and generating a chaos matrix by using a third integer pseudo-random sequence, carrying out XOR operation on the chaos matrix and the scrambled image matrix, changing an image pixel value, and completing image encryption to generate a ciphertext image C. The dynamic positioning generalized knight cruise scrambling method designed by the invention is simple in process, and the encryption efficiency can be remarkably improved.

The invention relates to the transmission and reception of non-binary error correcting code words. The transmission method includes a first modulation (56) which implements a set of q sequences comprising q−1 sequences of q−1 chips, each sequence being obtained by circular shifting of a basic pseudo-random sequence, and a partially invariant sequence, invariant to a predetermined subset of circular shifts. The first modulation (56) further implements an association between each code word symbol and a sequence of the set of sequences wherein said finite field GFq has a non-zero primitive element, the symbol zero being associated with said partially invariant sequence and a symbol equal to a power j of the primitive element, j being an integer comprised between 0 and q−2, being associated with a pseudo-random sequence determined by j circular shifts of the basic pseudo-random sequence.

Techniques are provided for securing reference signals. An example method for transmitting a signal based on a validated pseudo random sequence includes determining secure sequence validation information, generating a pseudo random sequence, validating the pseudo random sequence based on the secure sequence information, and transmitting the signal based at least in part on the validated pseudo random sequence.

The application provides a method and device for generating a pseudo-random sequence, an electronic device and a computer readable storage medium. The method comprises: performing AND operation and XOR operation on M bit values of a first sequence to obtain an (A+m)th bit value of the first sequence; wherein M is an integer greater than or equal to 1, and A is an integer greater than or equal to 0; and determining an mth bit value of the pseudo-random sequence according to the (A+m)th bit value of the first sequence.

This application discloses a communication method and apparatus. The method includes: A terminal device receives indication information, where the indication information indicates M combinations, and each combination includes one CS value and one comb offset value; or each combination includes a hopping value of one CS value and a hopping value of one comb offset value, where M is a positive integer. Then, the terminal device determines, based on the indication information, a first pseudo-random sequence, and a first time unit, a target CS value and a target comb offset value that correspond to a reference signal in the first time unit. Then, the terminal device sends the reference signal in the first time unit based on the target CS value and the target comb offset value.

The invention relates to the field of information security and random number generation, and discloses a pseudo-random sequence generation system based on a four-dimensional hyperchaotic system, and the system comprises a chaotic signal generation module which is used for generating a chaotic state track composed of four state variables; the numerical solution module is used for carrying out multi-step numerical integral iteration on the state variable; the signal optimization module is used for performing cross recombination, disturbance arrangement and nonlinear quantization on the state variables; the control management module is used for controlling initialization, operation time sequence and state synchronization of each module; and the output interface module is used for outputting the pseudorandom sequence. According to the method, a four-dimensional hyper-chaotic system and a double positive Lyapunov index structure are adopted as a core dynamics basis, the technical effect of improving the unpredictability of the pseudo-random sequence and the trajectory complexity is achieved, and the potential safety hazards that the dynamic behavior is single, the dependence on initial conditions is too weak and the like are effectively overcome.

The present application relates to a kind of pipeline SAR ADC digital background calibration method based on pseudo-random sequence injection, belong to analog integrated circuit technical field.After the residual error signal is obtained in the first stage SAR ADC quantization, pseudo-random sequence is injected in the residual error signal, the superimposed signal is sampled and converted by the later stage ADC, finally cause nonlinear error in digital code output code, then the sequence input and digital output code are correlated to obtain the error information of non-ideal factor in circuit, finally the actual interstage gain value in circuit is approximated by variable step iterative algorithm for digital code reconstruction analog signal, finally reach the effect of calibration.The present application can avoid the influence of step on speed and accuracy in iterative process, be used to calibrate the interstage gain error caused by capacitor mismatch and the limited gain of operational amplifier, and in the iterative process of calibration, better speed and accuracy are realized, the performance of ADC is obviously improved, and signal-to-noise ratio and spurious-free dynamic range are improved.

The invention belongs to the technical field of analog-to-digital converters, and particularly relates to a Pipeline SAR ADC background digital calibration method, which comprises the following steps: in a first-stage sub-ADC sampling stage, sampling an analog input signal by adopting a capacitor lower-stage board of a first-stage capacitor array; after the sampling is finished, the first-stage SAR ADC performs SAR conversion; obtaining a corresponding residual voltage and a pseudo-random PN sequence after SAR conversion; the residual voltage and the generated pseudo-random PN sequence are input into the amplifier, the output of the amplifier is obtained and serves as a second-stage input signal for sampling, and in the same way, each sub-ADC can generate a digital code; and inputting the digital codes output by all the sub-ADCs into a digital calibration module for digital calibration, and finally obtaining an output result. Compared with the traditional digital calibration technology, the method has the advantages that the non-linear error calibration is added, the convergence speed is increased, the calibration precision is improved, and the ADC performance is improved.

The invention discloses a chirp delay modulation backscatter communication method and a chirp delay modulation backscatter communication system combined with pseudorandom sequence detection, and mainly solves the problems of low data transmission rate, poor demodulation reliability in a low signal-to-noise ratio environment and high backscatter label complexity in the prior art. According to the scheme, a sending end periodically sends an upper sweep frequency signal as an excitation signal; the backscattering label determines delay time according to a to-be-sent data value, completes one-time modulation in two continuous excitation signal periods, and modulates a pseudo-random sequence into a backscattering signal; and a receiving end demodulates the backscattering signal by adopting a sliding window in combination with a pseudo-random sequence, intercepts the backscattering signal through the sliding window, and performs de-spreading processing and fast Fourier transform on the signal in each window to determine a symbol position so as to realize data demodulation. According to the method, multiple pieces of bit information can be transmitted in one symbol period, the data transmission rate and demodulation reliability are improved, the complexity of the backscattering tag is reduced, and the method can be used for low-power-consumption data transmission of the Internet of Things equipment.

The present invention belongs to the field of unmanned aerial vehicle data transmission, and is a MIMO-OFDM time-frequency synchronization method suitable for unmanned aerial vehicle strong multipath channels. It includes: (1) determining the number of transmitting antennas, the length of the preamble code and the pseudo-random sequence; (2) using the pseudo-random sequence to generate a multi-antenna transmission preamble code sequence; (3) using the multi-antenna preamble code to generate a transmission data frame; (4) correlating the preamble code sequence before and after for coarse time synchronization; (5) performing fractional frequency offset estimation and compensating the received data; (6) calculating the two-dimensional metric function of integer frequency offset estimation and fine time synchronization; (7) jointly performing the strongest path search and integer frequency offset estimation; (8) searching based on the strongest path to obtain a fine synchronization result. The present invention designs an orthogonal preamble sequence independent of the number of antennas at the transmitting end of the unmanned aerial vehicle MIMO-OFDM communication system. The coarse synchronization and fine synchronization algorithms at the receiving end are adapted to multipath channels, are not affected by frequency offset, have a large frequency offset estimation range, and can achieve good synchronization performance.

The invention discloses a foreground and background calibration fused capacitor mismatch calibration method and system, and the method comprises the steps: carrying out foreground digital calibration after a chip is powered on, and comprises the steps: obtaining an error voltage; quantizing the obtained error voltage to generate a corresponding error code word; the weight of foreground calibration is obtained; the method comprises the following steps of: generating a pseudorandom sequence and injecting the pseudorandom sequence into an input signal of an ADC (Analog to Digital Converter) when an ADC (Analog to Digital Converter) enters normal work; carrying out weighted summation on the digital code word quantized and output by the ADC and eliminating the interference of the pseudo-random sequence from the digital code word; and carrying out correlation calculation on the weighted summation result after the interference of the pseudo-random sequence is eliminated and the pseudo-random sequence to obtain a calibration coefficient, and carrying out iterative calculation on the capacitance weight according to the calibration coefficient. The advantages of foreground calibration and background calibration are fully combined, so that a better calibration effect is achieved.

The invention relates to the technical field of transformer sound wave detection, in particular to a noise processing method for transformer hot-spot temperature ultrasonic detection, which comprises the following steps of: multiplying a pseudo-random sequence coded signal by an electric signal of a transmitting end of an ultrasonic sensor to generate a modulation signal with a pseudo-random binary coded sequence; performing time domain windowing processing on the collected ultrasonic signals to obtain a spectrogram; performing dynamic frequency domain segmentation based on the spectrogram; performing clustering analysis on the low-frequency sub-bands, distinguishing steady-state vibration noise and transient interference, and establishing a corresponding noise feature library; performing wavelet threshold denoising on each windowed signal, and retaining a high-frequency ultrasonic signal; and performing cross-correlation operation on the reconstructed and spliced complete signal and the pseudo-random sequence coded signal, and extracting a cross-correlation function peak value. By combining the pseudo-random sequence coding signal with the ultrasonic signal, effective coding of the ultrasonic signal is realized, the noise immunity is enhanced, and the noise interference problem of the transformer in the ultrasonic detection process is effectively solved.

The invention discloses an image encryption method based on RNA extended coding and quantum chaos, and belongs to the field of information encryption, and the method comprises the steps: obtaining a plaintext image, coding the plaintext image to obtain initial coding information, and generating a secret key according to the initial coding information; according to the secret key, calculating by adopting a chaos equation to obtain a pseudo-random sequence, and transforming the pseudo-random sequence to obtain a sequence required by encryption; the method comprises the following steps: acquiring a three-dimensional matrix of a plaintext image, decomposing the three-dimensional matrix into a first high-bit matrix and a first low-bit matrix, carrying out block scrambling and RNA dynamic coding on the first high-bit matrix according to a sequence required by encryption, carrying out XOR calculation on the first low-bit matrix according to the sequence required by encryption, and carrying out XOR calculation on the first low-bit matrix according to the sequence required by encryption; carrying out cross iterative diffusion and synthesis on the matrix subjected to RNA dynamic coding and the matrix obtained by XOR calculation to obtain a color ciphertext image; the security and efficiency of information encryption can be realized.

A computer-implemented method for training an artificial intelligence model configured to characterize a fault on a transmission line, the method comprising the steps of: Receiving (501) a set of signals constituting a training signal base of the model, each signal corresponding to a simulation or measurement of a compressed reflectometry signal for a transmission line having a fault characterized by an impedance and / or a position, A compressed reflectometry signal resulting from the execution of the steps of: Injecting a predefined reflectometry signal into the transmission line, Carrying out a compressed acquisition of said signal comprising at least the multiplication of said signal taken from the line by a predefined pseudo-random sequence,Train (502) the artificial intelligence model from the training signal base to perform at least one task among: a task of classifying a type of fault present on the line, a task of predicting the position and / or the impedance of a fault present on the line. Figure 5,

The invention discloses a radio analog telephone communication encryption method, device and equipment and a medium, and the method comprises the steps: generating a frequency spectrum segment number and a pseudo-random sorting sequence through a preset encryption algorithm; and carrying out controllable segmentation on the total spectrum of the analog voice according to a continuous sequence from low frequency to high frequency, carrying out sequence recombination on each sub-spectrum according to a pseudo-random sequence, finally combining and outputting encrypted voice, and recovering the original voice by utilizing the same pseudo-random sequence reverse recombination at a receiving end. Therefore, the time-frequency continuity and statistical characteristics of the voice spectrum in the traditional radio analog communication are fundamentally changed. According to the method, frequency spectrums are recombined as a whole according to a pseudo-random rule, so that an eavesdropper can only obtain disordered voice signals after the frequency spectrums are rearranged even if the eavesdropper intercepts the signals, and the difficulty of passive cracking means such as frequency spectrum analysis, filtering reduction and voice recognition is remarkably increased; the problem that in the prior art, radio analog telephone communication is insufficient in encryption and easy to crack is solved.

A computer implemented method of generating a pseudo random sequence (PRS). The method comprises sub-dividing PRS generation operations into a plurality of PRS partitions. For each PRS partition, a PRS generation register value is determined based on an initial PRS value and a pre-computed PRS generation register advancement value. For each partition, the determined PRS generation register value is used to generate a PRS of an arbitrary or a predetermined length. The method includes transmitting the generated PRS to a computing module, device or system to perform a data processing function.

The present invention discloses an intermittent sampling interference method and system based on pseudo-random sequence frequency shift modulation, which relates to the technical field of radar electronic countermeasures, including intermittent sampling of enemy radar signals to obtain intermittent sampling signals; setting a pseudo-random sequence and a frequency shift amount, constructing a frequency shift amount function and a frequency shift modulation function; using the frequency shift modulation function to modulate and forward the intermittent sampling signal to obtain a frequency shift modulation interference signal; then performing matched filtering processing, parsing the filtered interference signal to obtain an optimal frequency shift amount matrix; substituting the optimal frequency shift amount matrix into the filtered interference signal to obtain an optimal interference signal, and implementing interference on the enemy radar. The present invention causes false targets to randomly superimpose around the real target, forming strong false targets with random distributions of leading, nearby, and lagging; not only adjusting the amplitude and position distribution of the strong false targets, but also destroying the time-frequency distribution and spatial distribution characteristics of the intermittent sampling interference, having both suppression and deception interference effects.

The present application relates to a pseudo-random sequence generation circuit and a pseudo-random sequence generation method for a processor. Based on the present application, a shift deduction circuit of the processor can deduce the shift deduction results of multiple single-bit registers subjected to linear feedback shifting for a specified number of shifts. The shift deduction circuit can use the shift deduction results to complete the shift jump of the multiple single-bit registers after the linear feedback shifting for the specified number of shifts at one time. In addition, the shift deduction results can also include the output register values of the output bit registers configured in the multiple single-bit registers during the linear feedback shifting for the specified number of shifts. Therefore, the output register values of the output bit registers obtained at one time in the shift deduction results can be output in parallel as the corresponding bits of the pseudo-random sequence, thereby achieving parallel output of the pseudo-random sequence, which in turn helps to reduce the operating frequency required to generate the pseudo-random sequence in the processor.

The invention relates to a pseudorandom sequence generation method and device and a medium, and the method comprises the steps: calculating weight vectors of different powers through modular operation based on a primitive polynomial of a Galois field, and obtaining a bit weight value of each bit; splitting the offset value into a plurality of accumulations in the form of power of 2 by using a binary decomposition method, and obtaining an initial vector at the offset position by combining the bit weight value at each bit; according to the bit width generation requirement, the one-dimensional weight matrix is expanded into a two-dimensional generation matrix based on the principle of a digital root method; based on the two-dimensional generation matrix, recursively calculating matrixes under different bit weights by using matrix power operation, and generating weight matrixes under different processing bit widths; generating a pseudorandom sequence starting point according to a mode of multiplying the initial vector at the offset position by the weight matrixes under different processing bit widths; and generating the pseudorandom sequence from the starting point of the pseudorandom sequence by using a recursive formula. According to the invention, waste of storage resources and bandwidth resources can be avoided.

The application discloses an image encryption method and system based on a chaotic system, and relates to the technical field of image processing.The method comprises the following steps: a chaotic system is constructed by combining a cellular automaton with a tent map; the coordinate values of pixel points are subjected to coordinate scrambling; all the pixel points are formed into a pixel matrix, the pixel matrix is traversed, and an initial encryption matrix is obtained; a pseudo-random sequence is obtained through the chaotic system, arranged into a row matrix and a column matrix, and subjected to exclusive or operation to convert a plaintext image into a two-dimensional matrix; the initial encryption matrix is converted into a two-dimensional encryption matrix; based on a CA model of the cellular automaton, the initial encryption matrix and the two-dimensional encryption matrix are subjected to pixel point value calculation and assignment, and a target encryption image is obtained.The application can solve the technical problems of the prior art, such as that the image encryption method based on the chaotic system is not sensitive to the plaintext image, cannot effectively defend against differential attacks, has poor robustness, and has the problems of periodicity and a generally small key space.

The present application relates to the technical field of wireless communications. Disclosed are a communication method and a related apparatus. The method is applied to a first communication apparatus. The method comprises: sending first information to a second communication apparatus, the first information being used for indicating a first pseudo-random sequence, the first pseudo-random sequence being used for training a channel estimation model, the channel estimation model being used for predicting a channel between the first communication apparatus and the second communication apparatus, and the channel being predicted on the basis of the first pseudo-random sequence and a second pseudo-random sequence; and sending the second pseudo-random sequence to the second communication apparatus. The present application is used for keeping the model performance of channel estimation models during training.

Provided are parameter configuration and parameter receiving methods and apparatuses, and a storage medium. The parameter configuration method includes: configuring reference pilot sequence parameters, and determining, according to the reference pilot sequence parameters, an initial value of a reference pilot pseudo-random sequence corresponding to each reference pilot group among M reference pilot groups, where the initial value of the reference pilot pseudo-random sequence is used for generating a pilot pseudo-random sequence of a corresponding reference pilot group, M is a positive integer, and each reference pilot group corresponds to at least one reference pilot port.

The invention relates to the technical field of communication security, and particularly provides an encryption method based on a dynamic coupling image lattice, comprising the following steps: S1, acquiring to-be-encrypted constellation diagram data, and taking the constellation diagram data as plaintext data; s2, carrying out DNA coding on the plaintext data, then carrying out arithmetic operation, and then carrying out DNA anti-coding to complete data disturbance encryption; rules of DNA coding, operation and DNA anti-coding are determined through a preset method. The preset method comprises the following steps: S21, acquiring a key sequence, and dividing the key sequence; s22, generating a first intermediate one-dimensional pseudo-random sequence by using a first chaotic mapping model; s23, performing dynamic iteration on the first intermediate one-dimensional pseudo-random sequence by using a one-dimensional coupling mapping lattice model fused by a second chaotic mapping model to obtain a second intermediate one-dimensional pseudo-random sequence; and S24, determining the rules of DNA coding, operation and DNA anti-coding through the second intermediate one-dimensional pseudorandom sequence. The method is high in sequence randomness and high in communication security.

This invention belongs to the field of communication technology, and particularly relates to a code Doppler verification device and method. An initial pseudo-random sequence C(t) is periodically sent from a signal source to a wireless channel simulator. The wireless channel simulator adds a code Doppler effect to the acquired initial pseudo-random sequence C(t) to obtain a pseudo-random sequence C′(t), and sends the pseudo-random sequence C′(t) and the initial pseudo-random sequence C(t) to a spectrum and signal analyzer. The spectrum and signal analyzer performs orthogonal demodulation and low-pass filtering on the initial pseudo-random sequence C(t) and the pseudo-random sequence C′(t) to obtain a pseudo-random sequence C0. n (t) and pseudo-random sequence C′ m (t), and the initial pseudo-random sequence C(t) and the pseudo-random sequence C n (t) and pseudo-random sequence C′ m (t) is sent to the host computer; the host computer, based on the initial pseudo-random sequence C(t) and the pseudo-random sequence C... n (t) and pseudo-random sequence C′ m (t) Verify whether the added code Doppler is consistent with the effect of symbol compression or expansion caused by the actual speed.

The invention relates to the technical field of communication, and provides a user configuration information acquisition method and device, equipment and a storage medium, and the method comprises the steps: obtaining a first sequence value of a first sequence in a pseudorandom sequence of a user, and a generation matrix of a second sequence; calculating an inverse matrix corresponding to the initialization value of the second sequence according to the generated matrix; soft information data is obtained from physical downlink control channel data, and hard bit data is calculated according to the soft information data; calculating a cracking sequence by using the first sequence value and the hard bit data; and calculating a wireless network temporary identifier to be used by the user based on the cracking sequence and the inverse matrix, and obtaining configuration information of the user according to the wireless network temporary identifier. By receiving the hard bit data corresponding to the data and the generation matrix of the second sequence, when the wireless network temporary identifier of the user is directly calculated, the calculation amount can be reduced, rate de-matching does not need to be carried out, and the complexity is reduced.

A wireless power transmission system is provided for encoding (462, 526) a beacon signal in a wireless power delivery environment. The wireless power transmission system is used to encode a beacon signal to isolate a client device (546) for wireless (550) power delivery in a wireless power delivery environment. The beacon signal can be encoded or modulated (462) with a transmission code provided (524) to a selected client in the wireless power delivery environment. In this way, the beacon signal from the selected client can be identified and the corresponding client device is isolated for wireless power delivery (544, 546). In some embodiments, the transmission code can be a pseudo-random sequence used by the wireless power delivery client to encode the transmitted beacon signal.