168 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.

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 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 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 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 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 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.

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.

The invention relates to an efficient frequency hopping sequence construction method based on a national cryptographic algorithm SM4, belongs to the technical field of information security, and solves the problems that in the prior art, frequency hopping sequence design is low in security and insufficient in anti-interference performance and cannot meet the domestic application requirement. Comprising the following steps: generating 32 rounds of round keys based on a user key Key; receiving system clock information TOD and the round key, and generating a pseudo-random sequence of frequency hopping communication through 32 rounds of iterative operation; and converting the pseudo-random sequence to obtain a frequency hopping sequence with an adjustable frequency slot number. The frequency hopping sequence with the adjustable frequency gap number is generated, the safety is high, the efficiency is high, the anti-interference capacity is high, and the domestic application requirement is met.

This invention proposes an image encryption method, system, and decryption method and system, relating to the technical field of information security. It utilizes the computational holographic GS algorithm to encode the original image into a pure phase holographic encrypted image. Then, based on a pseudo-random block-based approach, a Logistic chaotic system is used to generate a pseudo-random sequence and obtain its complementary sequence. These two sequences are used to block-process the pure phase holographic encrypted image, generating two complementary sub-images. This avoids strong correlation between image pixels and ensures the reliability of encryption for each image pixel. Next, the Logistic chaotic system is used to perform a bitwise XOR operation on the block sub-images to obtain scrambled encrypted sub-images. Finally, the scrambled encrypted sub-images are synthesized into a complete encrypted image. This results in better encryption performance, a larger key space, and improved confidentiality and security during image transmission and use.

The invention relates to a remote sensing image encryption method based on four-dimensional hyperchaotic mapping, and belongs to the technical field of information security. The method comprises the following steps: constructing a four-dimensional hyperchaotic system based on improved Henon and Quadratic mapping; generating an initial value of a four-dimensional hyper-chaotic system by combining the chi-square test value and the hash value of the remote sensing image to be encrypted, and performing iteration to generate a pseudo-random sequence; the method comprises the following steps: partitioning a remote sensing image to be encrypted, generating a three-dimensional random matrix by using a pseudo-random sequence to perform pixel scrambling on the partitioned image, generating four one-dimensional random matrixes by using the pseudo-random sequence, and obtaining four new S boxes for pixel replacement by combining a dynamic mask interleaving method; and combining the Gaussian function and the sine function to generate a waveform curve, and performing XOR on the waveform curve and the value of the pseudo-random sequence to realize scrambling and diffusion of pixels, and finally forming a ciphertext image. The objective of the invention is to solve the technical problem that security is difficult to guarantee due to relatively single phase space structure and obvious periodic characteristics during image encryption of traditional chaotic mapping.

The present invention discloses a method for generating a pseudo-random sequence for integer data in signal processing. The seed can be arbitrarily selected within the range of integer data. The sequence iteration algorithm does not use multiplication and modulo operations, and the sequence data traverses the entire data range. The present invention simplifies the linear congruence algorithm, making the generation speed of the pseudo-random sequence faster and more resource-saving, while still retaining the characteristic of a long output sequence period. The present invention is applicable to various integer data types and can also be extended to any hexadecimal data with the number of bits n≥8. Pseudo-random sequences play an important role in information security fields such as multiple access communication, encryption algorithms, data scrambling, signal synchronization, error code testing, security protocols, digital watermarking, and cryptographic chips.

The invention discloses a quantization index modulation steganography method based on chaos assistance, and aims to improve the security and concealment of information hiding. According to the method, a high-complexity pseudo-random sequence is generated by combining a delay coupling Lorentz chaotic system, the pseudo-random sequence is converted into a uniformly-distributed sequence through modular lattice operation, the uniformly-distributed sequence serves as external jitter to be introduced into a lattice quantization process, and therefore safe embedding of messages is achieved. According to the method, high-density embedding can be realized while carrier signal statistical characteristics are kept to effectively resist statistical steganalysis, and the method has relatively good image quality and robustness and is suitable for various types of digital carriers such as images, audios and the like.

The embodiment of the invention provides an information acquisition method, if a DMRS is generated based on a ZC sequence, a root and / or cyclic shift amount corresponding to the ZC sequence is acquired, a target parameter corresponding to a single carrier SSB is carried through the root and / or cyclic shift amount, and the target parameter can be one or more of a cell identifier, an SSB index and a half-frame indication. That is, the amount of root and / or cyclic shift correlates with the value of the target parameter. In addition, the amount of root and / or cyclic shift also correlates with the length of the sequence corresponding to the DMRS. And if the DMRS is generated based on the pseudo-random sequence, obtaining related information corresponding to the pseudo-random sequence, and carrying a target parameter corresponding to the single carrier SSB through the related information. Wherein the related information comprises one or more of the initial value, the generator polynomial or the offset, and the related information is related to the value of the target parameter. Visibly, in the single carrier SSB, information related to the single carrier SSB is carried through the DMRS.

This application relates to a high-precision modeling method for low-Earth orbit (LEO) satellite orbits based on measured data correction. The method includes: first, acquiring measured orbital error data of in-orbit LEO satellites; setting the simulation scenario duration; periodically extending or pruning / segmenting the error data; generating a pseudo-random sequence using a 10-level feedback shift register; modulating and combining the pseudo-random sequence to obtain a first and a second sequence; filtering the valid second sequence through correlation calculation to obtain uncorrelated sequences for each segment; finally, combining and sampling according to the number of satellites, adding the orbital error to the error-free orbit to achieve high-precision modeling. This method can accurately reflect the characteristics of measured orbital errors, achieving high-precision modeling of LEO satellite orbits.

The invention discloses a demodulation reference signal sequence generation method and device, equipment, a medium and a product. The method comprises the following steps: determining a current signal index and a current time slot index, and determining a current index number according to the current signal index and the current time slot index; querying a predetermined register data table according to the current index number, and determining a current first state register value and a current second state register value; according to the method, iterative calculation is performed according to the current value of the first state register and the current value of the second state register to obtain a preset number of pseudo-random sequence values, and the demodulation reference signal sequence is generated according to the preset number of pseudo-random sequence values, so that the problem of computing resource waste in the demodulation reference signal sequence generation process is solved, and the demodulation reference signal sequence generation efficiency is improved. The register data table is generated in advance, the first state register value and the second state register value are stored through the register data table, the state register value is rapidly obtained, multiple iterations are not needed, computing resources are saved, and the sequence generation speed is increased.