50 results about "Pseudorandom sequence" patented technology

The invention discloses a method capable of realizing wide-range positioning of a cable fault, a spread spectrum step frequency wave signal is obtained by performing binary phase shift keying (BPSK) and pseudorandom sequence modulation on a step frequency signal, and the method can overcome the problem that the cable fault detection range of a spread spectrum time domain reflectometry (SSTDR) is limited by code element duration. A cable fault detection device is installed at the head end of a cable, a detection signal is injected from the head end of the cable, a high-speed ADC is used for signal collection, cable fault information is obtained, and wide-range detection of cable faults is achieved.

The invention discloses a satellite network data sending method and a satellite network data sending device in order to solve the problem that in the prior art, in an ultra-low signal-to-noise ratio mode, frame capture and data demodulation cannot be completed, and therefore the communication requirement of a small-size antenna terminal cannot be met. The frame body part is generated based on the to-be-transmitted satellite load data packet, and the frame header part comprises a pseudorandom sequence and a physical layer signaling which are sufficient in length, so that the signal-to-noise ratio of the whole data frame is improved by increasing the length of the frame header, and the communication performance of the antenna terminal is improved. Therefore, the antenna can be detected and identified by a small-size antenna terminal under the condition of a low signal-to-noise ratio.

The invention discloses an optical fiber optical frequency transmission relay system and method based on a spread spectrum technology. The relay system comprises a receiving module, a regenerative laser module and a sending module. The receiving module is used for demodulating the spread spectrum optical signal according to the second pseudo-random sequence to obtain a demodulated optical signal; the spread spectrum optical signal is a signal which is transmitted through an optical fiber link after a preceding stage performs spectrum spreading on the optical signal; the regeneration laser module is used for locking the frequency of the demodulation optical signal to generate a regeneration optical signal and splitting the regeneration optical signal to obtain a return optical signal and a transmission optical signal; the receiving module is also used for modulating the returned optical signal according to the second pseudo-random sequence and transmitting the modulated returned optical signal back to the preceding stage; and the sending module is used for demodulating the post-stage modulation return optical signal to obtain a demodulated return optical signal, carrying out noise suppression and spectrum spreading on the transmission optical signal according to the demodulated return optical signal and a third pseudo-random sequence, and then transmitting the transmission optical signal to the post-stage. By introducing the spread spectrum technology, the second-order Rayleigh scattering signals are filtered out, and the stability and reliability of the system are remarkably improved.

The invention relates to a method (200) for calibrating a conversion chain (12) of an analogue signal receiver (10), which method comprises: - generating (205) a pseudo-random sequence (S) of states used for the formation (210) of a frequency-modulated analogue calibration signal (ANA_cal,mod); - injecting (215) this calibration signal into the conversion chain (12); - forming a digital signal to be processed (NUM_BB) by demodulating (220) an intermediate digital signal (NUM_int) received in response to the modulated analogue calibration signal (ANA_cal,mod); - determining (225) a correlation function R(NUM_BB,S) between the digital signal to be processed (NUM,BB) and the pseudo-random sequence (S); - determining (230) a transfer function (H) of the conversion chain based on the correlation function R(NUM_BB,S); and - where necessary, determining (235) a parameter (Ci) of a processing step at the output based on the transfer function (H).

A method for reducing parasitic signal components in an output signal (360) of a sigma-delta modulator (110) is described in which the output signal (360) is generated by processing a digital input signal (310) in a signal processing path (111) of the sigma-delta modulator (110). In this case, a digital dither signal (300) is provided in the form of a pseudo-random sequence consisting of non-binary digital words (301). Furthermore, an intermediate signal (331) generated by processing the digital input signal (310) in a signal processing path (111) of the sigma-delta modulator (110) is combined with the digital dither signal (300) in order to produce a modified intermediate signal (340). The output signal (360) is then generated by processing the modified intermediate signal (340) in a signal processing path (111) of the sigma-delta modulator (110).

An apparatus comprising an antenna array including multiple planar slot antenna elements with integrated feedlines, wherein the positions, orientation angles, and feedline lengths of the antenna elements are mutually uncorrelated to produce spatial and temporal incoherence. The apparatus may include a substrate having irregular ridge faces supporting the antenna elements, a switching circuit configured to activate subsets of the antenna elements according to randomized or pseudo-random sequences, and a controller operatively coupled to the switching circuit.

This invention relates to a sensing-integrated waveform design method based on OFDM time-frequency domain phase coding, belonging to the field of wireless communication technology. In this method, the transmitting end generates a complementary Gray sequence and a pseudo-random sequence. These two sequences are then divided into blocks in the frequency domain according to their indices and phase-coded to generate a sensing waveform. A communication signal is generated through an OFDM system. The frame header of the sensing waveform is aligned with the start position of the SSB of the communication signal to generate a sensing-integrated waveform. The time slot of the transmitted communication signal is used; this waveform is the result of multiplying the communication waveform and the sensing waveform in the time domain; otherwise, the waveform is the sensing waveform. The receiving end shares the synchronization signal block and the sensing waveform. The SSB portion of the bandwidth signal is extracted from the received echo signal to estimate the time-frequency, and the echo signal is compensated. The sensing waveform is then separated from the compensated signal to reconstruct the communication signal. The waveform generated by this invention can effectively eliminate spurious peaks in the OFDM waveform, improving the sensing accuracy of the waveform without sacrificing communication performance.

A link training method and apparatus, which relate to the technical field of communications. The method comprises: starting a link training process for a link, wherein the link comprises at least one channel; receiving a first control frame, wherein the first control frame comprises a first training sequence; on the basis of the first control frame, locking a clock of the at least one channel, and sending a first logic layer management packet, wherein the first logic layer management packet indicates that the clock of the at least one channel has been successfully locked; receiving a second control frame, wherein the second control frame comprises a second training sequence, which comprises a pseudo-random sequence; on the basis of the second control frame, executing equalization training of the at least one channel, and sending a second logic layer management packet, wherein the second logic layer management packet indicates that the equalization training of the at least one channel has succeeded; receiving a third control frame, wherein the third control frame comprises a third training sequence, which comprises a pseudo-random sequence, and the second training sequence is different from the third training sequence; and on the basis of the third control frame, locking a data boundary of the at least one channel, and sending a third logic layer management packet, wherein the third logic layer management packet indicates a channel that has been successfully locked and / or a channel that has failed to be locked among the at least one channel.

The embodiments of the present application provide a communication signal processing method, system, electronic device and storage medium, which belong to the field of communications. The method includes: obtaining an initial signal to be sent and the number of antennas of a transmitting antenna; determining a target modulation format of the initial signal from a plurality of preset low-capture modulation formats; generating a corresponding pseudo-random sequence according to the target modulation format and the number of antennas, and using the pseudo-random sequence as header information, performing low-capture processing on the header information to obtain target header information; obtaining initial payload data of the initial signal, performing low-capture processing on the initial payload data, and obtaining target payload data; generating an initial demodulation signal mapped to each transmitting antenna, performing low-capture processing on the initial demodulation signal, and obtaining a target demodulation reference signal; performing framing processing according to the target header information, target payload data and target demodulation reference signal to generate a target signal for transmission.

This application relates to a passive optical network (PON) monitoring device and detection method, comprising: a light generation module for generating pulsed light with a pseudo-random sequence; a circulator that transmits the optical signal downlink to the optical fiber trunk and simultaneously sends the reflected uplink optical signal to a reflected light analysis module; a splitter that distributes the downlink optical signal to optical network units (ONUs) and simultaneously converges the uplink optical signal to the optical fiber trunk; and a reflected light analysis module for receiving the reflected light signal and analyzing the fault location based on the reflected light signal. This application generates pulsed light with a pseudo-random sequence through the light generation module. The pulsed light reaches each branch link via the circulator and splitter. Reflection points on each branch link reflect the pulsed light back to the reflected light analysis module, which then analyzes the fault location based on the reflected light signal. This invention can achieve high-precision resolution by controlling the pulsed light with a pseudo-random sequence, and can be used for fault detection in point-to-multipoint networks.

The invention discloses a railway power supply equipment on-line data processing system based on Internet of Things coding, and the system comprises an Internet of Things coding module which collects sensor data and obtains corresponding Internet of Things coding data, and carries out the coupling of pseudorandom sequence data based on the Internet of Things coding data and the sensor data, generating an enhanced coding label with a non-localized correlation characteristic; the optimal feature screening module is used for performing coding feature extraction on the enhanced coding tag, evaluating an importance index of a data type through a hierarchical structure model according to the coding feature, and obtaining an optimal data feature according to the importance index; the dynamic adaptive optimization module is used for acquiring a behavior feature sequence of the optimal data feature, and constructing a dynamic adaptive reinforcement learning model according to the behavior feature sequence; compared with a traditional reinforcement learning model which directly uses original data or simply processed features, the data source and features of the improved model are more unique and complex.

A frequency change synchronization method in a self-adaptive frequency change communication system comprises the following steps: firstly, carrying out hierarchical division on available frequency points, and determining the available frequency points and cluster head frequency points through electromagnetic spectrum sensing and intelligent decision; secondly, generating two-stage pseudo-random sequences for the available frequency points, forming synchronous frames, and sending the synchronous frames on the cluster head frequency points according to specific duration and frequency; and a receiver receives and analyzes available frequency points by adopting a two-stage parallel capture mechanism, so that frequency conversion synchronization is realized. The method has the advantages of being high in synchronization speed, high in adaptability, easy to implement and the like, can effectively improve the reliability and the real-time performance of the self-adaptive frequency hopping communication system in the interference environment, and is suitable for various communication application scenes.

The present invention relates to a method for protecting a sensitive data sequence within an integrated circuit. The method comprises generating a pseudorandom sequence based on a seed sequence stored in the integrated circuit, combining the sensitive data sequence and the pseudorandom sequence to generate a protected data sequence, and storing the protected data sequence in the integrated circuit. The protected data sequence cannot be accessed from outside the integrated circuit.

The present invention relates to the field of coding, and more particularly to an improved Festel-based encryption method for EPC codes of aircraft equipment. The method comprises the following steps: S1, mapping the aircraft equipment code to the EPC code; S2, encrypting the aircraft equipment EPC code using the improved Festel network, including the following substeps: S21, segmenting the EPC code into scrambling, left, and right halves; S22, generating a pseudorandom sequence using a pseudorandom number generator; S23, obtaining a binary number as a round key based on the pseudorandom sequence; and S24, iterative encryption to obtain a final encrypted result. The present invention maps traditional aircraft equipment codes to EPC codes and encrypts them using the improved Feistel network. This method not only enhances information uniformity and traceability, but also ensures data security while preserving the standard format of the EPC code.

The invention discloses an electrosurgical tissue impedance measurement system and method based on frequency domain analysis. The system comprises a main energy generation module, a modulation signal generation module, an output superposition module, a signal acquisition module, an impedance calculation module and a feedback control module. The main energy generation module outputs a high-frequency main waveform for tissue cutting or blood coagulation; the modulation signal generation module is used for generating a modulation signal, and the modulation signal comprises one of a multi-cosine signal or a multi-frequency sweep-frequency signal and a pseudo-random sequence; the output superposition module is used for superposing the modulation signal into the main waveform; the signal acquisition module synchronously acquires tissue voltage and current signals after the modulation signal is loaded; the impedance calculation module is used for performing frequency domain analysis on the voltage and current signals acquired by the signal acquisition module, extracting frequency components corresponding to modulation signals by using fast Fourier transform (FFT), phase lock detection (PLL) or a time-frequency analysis algorithm, and performing frequency domain analysis on multi-cosine signals or frequency sweep signals; by comparing the amplitude ratio and the phase difference of the corresponding frequency components of the modulation signal output end and the response end, the impedance Z = RZ < Z of the measured tissue is inverted according to the known reference impedance, and Z is the impedance of the measured tissue; rZ is the amplitude of the measured impedance and reflects the magnitude of the impedance; < Z represents the phase difference between the voltage and the current; for a pseudo-random sequence signal, a matched filter is used for carrying out related detection on an input signal, and a pseudo-random sequence value is extracted so as to obtain a system signal and control data; a feedback control module adjusts the output power or the cutting / coagulation mode of the electrosurgical equipment in real time according to the tissue impedance obtained through calculation and the dynamic change of the tissue impedance; wherein the dynamic change is a group of dynamic sequence values of the impedance of the measured tissue from the time dimension. By means of the design, real-time accurate measurement can be achieved, the anti-interference capability is high, errors are small, and efficient and safe cutting / blood coagulation can be achieved.

The invention relates to a cable diagnosis method and chip for an industrial field bus, and the method comprises the steps: generating a pseudorandom sequence at a transmitting end, converting the pseudorandom sequence into an analog signal, and injecting the analog signal into a to-be-detected cable; providing the pseudo-random sequence as a reference sequence to a receiving end; a receiving end collects echo signals on the cable, and samples and converts the echo signals into a sampling sequence; executing a peak detection process, including: estimating a channel impulse response through an iterative correlation estimation method based on the sampling sequence and the reference sequence, the channel impulse response including a discrete coefficient vector; detecting a peak value meeting a preset condition from the channel impulse response; and determining the fault type of the cable according to the symbol and amplitude of the detected peak value, and / or calculating the fault position on the cable according to the position of the peak value in the channel impulse response. The industrial field bus cable fault diagnosis method is suitable for diagnosis of industrial field bus cable faults in a complex electromagnetic measurement environment.

The invention discloses a DNA (deoxyribonucleic acid) storage method based on data superposition pseudorandom sequence index, which comprises the following steps of: firstly, performing exclusive OR on a pseudorandom sequence and a sparse coding sequence to generate an addressable short fragment oligonucleotide sequence; then, by using the superposed pseudo-random sequence as an index, correlating the pseudo-random sequence hidden in the sequencing read with the known pseudo-random sequence at the boundary of each pseudo-random sequence by using a small sliding window to realize quick positioning of the read so as to determine the position of the read on the whole pseudo-random sequence; and finally, reconstructing a sparse coding sequence by adopting a majority voting algorithm, and realizing error-free recovery of data through sparse code decoding and iterative decoding. The method has the advantages that sequence positioning can be achieved only through correlation operation at the boundary of each pseudo-random sequence, local label sequences do not need to be added to oligonucleotide molecules, data recovery performance reduction caused by label sequence damage, sequence breakage and the like is avoided, and rapid data recovery can be achieved under low sequencing coverage.

The embodiment of the invention discloses a satellite network data sending method. Comprises: acquiring a satellite load data packet; establishing data frames corresponding to the satellite load data packet, wherein the data frames comprise a first signal-to-noise ratio data frame, a second signal-to-noise ratio data frame and a third signal-to-noise ratio data frame; sending the data frame to a receiving end, and processing the data frame to obtain a satellite load data packet; the ranges of working points of the first signal-to-noise ratio data frame, the second signal-to-noise ratio data frame and the third signal-to-noise ratio data frame are greater than or equal to-15dB and less than-10dB, greater than or equal to-10dB and less than 0dB, and greater than or equal to 0dB and less than 20dB; the first signal-to-noise ratio data frame comprises a plurality of sub-first signal-to-noise ratio data frames, and the frame length of the sub-first signal-to-noise ratio data frames is the same as the frame length of the second signal-to-noise ratio data frame and the frame length of the third signal-to-noise ratio data frame; the unique code domain of the frame header of the first signal-to-noise ratio data frame, the unique code domain of the frame header of the second signal-to-noise ratio data frame and the unique code domain of the frame header of the third signal-to-noise ratio data frame are selected from a pseudorandom sequence set.

The application relates to a microcomputer video information protection method and system based on variable sequence related interference, which specifically comprises the following steps: collecting an original video signal and calculating a video timing parameter; configuring a multiple clock source frequency according to a line frequency, generating and dynamically rearranging an initial pseudo-random sequence to obtain a variable sequence related interference signal; identifying a scanning interval, generating a digital scrambling pulse during a forward stroke and superimposing the variable sequence related interference signal to generate a time domain scrambling composite signal, and attenuating the variable sequence related interference signal to generate the time domain scrambling composite signal during a reverse stroke; generating a wideband white noise signal, mixing the wideband white noise signal with the time domain scrambling composite signal to obtain a full-band mixed interference signal; generating an envelope modulation waveform, and amplitude modulating the full-band mixed interference signal to generate a simulation video radiation interference signal; collecting a real-time radiation intensity adjustment gain and outputting a target interference emission signal; collecting a power line conduction leakage signal, and generating an inverse filtering signal to offset the power line conduction leakage signal. The application improves the security of microcomputer video information.

The invention relates generally to the radio navigation field and may be applied to design of Global Navigation Satellite System (GNSS) Receivers, and particularly of GNSS GPS (USA), Galileo (EU), Glonass (Russia), Beidou (China), QZSS (Japan), IRNSS (India), and augmentation systems SBAS (different states). In the invention, the function of generating various PRN codes is repositioned from numerous tracking channels of multi-frequency, multi-constellation GNSS receiver to a shared PRN code generator unit, which serves in series all tracking channels. Such centralization of the PRN codes generation function enables a significant complexity reduction when the GNSS receiver includes a great number of tracking channels. A sufficient speed performance of the shared PRN code generator is achieved due to transfer of the PRN code lines from the shared PRN code generator to the receiver tracking channels via a dedicated parallel bus. Speed performance requirements to the dedicated parallel bus of the shared PRN code generator is kept moderate by a special number of symbols choice of PRN code lines thus providing uniformity of tracking channels requests to get new code lines. Use of several alternate means of PRN code lines forming: PRN Code ROM, PRN Code RAM, LFSR-based and one-shot PRN code generators—permits choosing optimal generation means for each type of GNSS signals.

The present invention discloses a message-driven two-stage frequency hopping method, which relates to the field of communication technology. It includes: physical layer processing at the transmitting end: channel coding and data segmentation, modulation and serial-to-parallel conversion, subcarrier frequency hopping position sequence generation, subcarrier mapping and OFDM modulation, radio frequency hopping sequence generation, frequency shifting and signal transmission; the receiving end physical layer performs the inverse transformation of the corresponding steps of the transmitting end physical layer to restore the data. The present invention does not transmit all the data through the wireless channel, but hides part of the data in the frequency hopping sequence, and uses the unpredictability of the sent message at the subcarrier level and the radio frequency level to achieve true random frequency hopping. Compared with the traditional pseudo-random sequence-based frequency hopping scheme, it makes it impossible for attackers to predict the communication frequency, nor to obtain all the data from the wireless channel, and can effectively avoid malicious interference and protect user data privacy.

The invention discloses a power system false data injection attack detection method and device based on periodic random diagonal measurement coding, and belongs to the field of power system information security. In order to solve the problem that a traditional residual detection method cannot identify hidden false data injection attacks, the invention provides a coding-decoding + state estimation collaborative mechanism. The method comprises the steps that reversible random coding is applied to necessary measurement at a source end, so that latent attack vectors are explicit in a decoding domain; a pseudorandom sequence generator is adopted to synchronously generate a reversible matrix for measurement coding, decoding and state estimation are carried out in a control center, and attack existence is judged through residual statistics.

The invention relates to a distributed satellite system phase error calibration method based on a pseudorandom sequence. The method comprises the following steps: firstly, modeling an SDS-TWR ranging process; before a satellite is launched, to-be-tested equipment is connected through a cable on the ground; a cable connection method is adopted, receiving and transmitting time delay caused by equipment is obtained through multiple times of measurement, and a satellite clock is calibrated; secondly, measuring the distance from each forwarding satellite to a gateway station by adopting an SDS-TWR ranging method, calibrating the distance, and converting the calibrated measurement distance into transmission time delay; and finally, each forwarding satellite calculates the time delay in the downlink transmission process of the respective link, and sends the time delay information to the sending satellite. The sending satellite adjusts the phase of the transmission signal of each forwarding link according to the downlink time delays of different forwarding links, so that the phase of the signals passing through different downlink forwarding links is kept consistent when the signals arrive at the gateway station, thereby realizing synchronous data transmission of the satellite formation system, and improving the cooperative capability of synchronous transmission of satellites.

Embodiments of this application disclose a signal sending method, including: sending a plurality of reference signals, where initial values of the plurality of reference signals are the same, and a time domain interval between any two adjacent reference signals in the plurality of reference signals is less than one radio frame; and receiving echo signals of the plurality of reference signals. Because initial values of pseudo-random sequences of a plurality of reference signals sent by a network device are all the same, interfering signals received by the network device from another network device within coherent processing time remain substantially unchanged within the coherent processing time. Interfering signals present after Fourier transform are concentrated in a zero-velocity region of a range-velocity spectrum, reducing an extent of a sensing blind zone.

The invention provides a calibration method and system for a high-speed pipelined ADC, input signals of the high-speed pipelined ADC are respectively input into a first-stage MDAC and a first-stage sub-ADC, and the calibration method is characterized by comprising the following steps: injecting a pseudorandom sequence into the first-stage ADC and a comparator of the first-stage MDAC at the same time, wherein the pseudo-random sequence is used for representing a sequence number of a comparator corresponding to a comparator threshold value; estimating a threshold deviation of each comparator and a matching delay of an analog front-end network of the first-stage sub-ADC in a digital domain; and generating a corresponding trimming code according to the threshold deviation and the matching delay, and feeding back the trimming code to the high-speed pipelined ADC to complete calibration. The device is small in occupied layout area, low in power consumption, high in trimming speed, large in trimming range and capable of adapting to different processes and application environments.

Radio network nodes, wireless devices, and related methods are provided in which a pseudo-random sequence initialization value, which is used during the generation of pseudo-random and / or scrambling sequences, is based, at least in part, on a first identifier, wherein the first identifier is equal to a first parameter if the first parameter has been configured and if a second identifier corresponds to a wireless-device-specific identifier.

The invention provides a satellite communication navigation fusion multiple access signal design method based on continuous interference elimination. With the increasingly mature continuous interference elimination technology, the anti-interference capability of a satellite navigation signal and the certainty of a pseudorandom sequence used by a navigation satellite are considered at the same time; the technical complexity of simulating and removing positioning signals in received signals through the continuous interference elimination technology is lower than that of layer-by-layer decoding in non-orthogonal multiple access, and it is possible that the continuous interference elimination technology is used for communication navigation fusion waveform design. In order to give play to the advantages of the continuous interference cancellation technology on multiple access, the downlink communication service is provided for a plurality of users by using the same time-frequency resource in combination with a rate splitting multiple access strategy. A communication navigation fusion multiple access scheme is designed by considering the adaptability of a positioning information sequence and a continuous interference elimination technology, the characteristic of stability of an LEO satellite constellation global coverage signal and the high spectrum efficiency and flexibility of rate splitting multiple access.

Method (200) for detecting a message in a Doppler-affected radio signal. The message comprises a Zadoff-Chu ZC sequence followed by a pseudo-random PN sequence. The method comprises: a first cross-correlation (201) between the signal and a local replica of the ZC sequence; a determination (202) of an approximate start time of the ZC sequence in the signal as a function of a maximum of the first correlation; a transformation (203) of the received signal by multiplying it by a conjugate sequence of the ZC sequence; a transformation (204) of a local replica of the ZC sequence followed by the PN sequence by multiplying it by the conjugate sequence; a second cross-correlation (205) between the transformed signal and the transformed local replica; a determination (206) of a precise start time of the ZC sequence as a function of a maximum of the second correlation. Figure for the abstract: Fig. 9

This invention provides a load fault detection method, a load fault detection system, and an electronic device. The method includes: First, spreading the original signal using a pseudo-random sequence to obtain a driving signal. Since the bandwidth of the pseudo-random sequence is greater than that of the original signal, the signal bandwidth of the driving signal is widened, thereby improving the anti-interference capability of the driving signal. Furthermore, since the amplitude of the pseudo-random sequence is attenuated by a preset decibel compared to the original signal, interference from the pseudo-random sequence to the original signal is avoided. Next, the driving signal is output to the load, and the return signal from the load is acquired. Finally, correlation analysis is performed on the return signal and the pseudo-random sequence to obtain a despread signal, and the energy magnitude of the despread signal is extracted. The fault type of the load is determined based on the energy magnitude of the despread signal. Because the signal-to-noise ratio of the despread signal has a significantly higher gain than that of the driving signal, the accuracy of load detection is greatly improved.

The invention relates to the technical field of image processing, in particular to an image deblurring processing method and device, equipment and a medium, and the method comprises the steps: obtaining a coded image after pseudorandom sequence coding; calculating a point spread function of the coded image by using a deep learning model; and calculating a pseudo-inverse matrix of the point spread function, and performing deblurring processing on the coded image by using the pseudo-inverse matrix. Therefore, the problem that the deblurring effect is not ideal in a complex actual scene in the prior art is solved.