19 results about "Pseudorandom sequence" patented technology

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).

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.

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 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 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 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 technology disclosed teaches a system and methods for end-to-end self-calibration of a channel emulator, wherein the channel emulator includes at least one channel emulator signal chain and at least one integrated parallel calibration signal chain. The channel emulator signal chain further includes an input signal, a first signal conditioner, a first analog-to-digital converter, a baseband processor, second signal conditioner, and an output. The integrated parallel calibration signal chain further includes a sequence generator, wherein the sequence generator is configured to generate a pseudo-random sequence upon which a calibration analysis signal is overlayed. On the supplying side, the sequence generator is coupled to a second digital-to-analog converter for supplying the calibration analysis signal to be processed by the channel emulator signal chain. On the evaluating side, the sequence generator is coupled to a comparator for evaluating results of the processed calibration analysis signal.

The technology disclosed teaches a system and methods for end-to-end self-calibration of a channel emulator, wherein the channel emulator includes at least one channel emulator signal chain and at least one integrated parallel calibration signal chain. The channel emulator signal chain further includes an input signal, a first signal conditioner, a first analog-to-digital converter, a baseband processor, second signal conditioner, and an output. The integrated parallel calibration signal chain further includes a sequence generator, wherein the sequence generator is configured to generate a pseudo-random sequence upon which a calibration analysis signal is overlayed. On the supplying side, the sequence generator is coupled to a second digital-to-analog converter for supplying the calibration analysis signal to be processed by the channel emulator signal chain. On the evaluating side, the sequence generator is coupled to a comparator for evaluating results of the processed calibration analysis signal.

The present application relates to a kind of radar communication integration signal generation device based on pulse frequency agility, belong to radar communication integration technical field.The device includes spread spectrum modulation unit, pulse modulation unit, nonlinear unit, power amplifier unit;The spread spectrum modulation unit receives user data, through data grouping, selection mapping and phase shift mapping, data is loaded to pseudo-random sequence to realize spread spectrum modulation, and output to the pulse modulation unit;The pulse modulation unit completes pulse amplitude modulation, and after integration, output to the nonlinear unit;The nonlinear unit is based on cubic power nonlinear frequency modulation signal generation carrier frequency and phase pseudo-random variable radar communication integration signal, and output to the power amplifier unit;The power amplifier unit received signal is power amplified and output to antenna.The present application improves the anti-interference ability of radar communication integration modulated signal, information transmission capacity and power utilization rate.

The invention provides a photovoltaic module defect detection system and method in a daytime environment, and an inspection system, and can be used in the technical field of photovoltaic power generation. The system comprises a high-voltage excitation module, an image acquisition module, an image processing module and a defect detection module, the high-voltage excitation module is used for inputting a coding current excitation signal based on code domain modulation to at least one photovoltaic module so as to excite the photovoltaic module to generate a time-varying electroluminescence signal; wherein the coding current excitation signal is an alternating current or a pseudo-random sequence current; the image acquisition module is used for continuously acquiring infrared images of the photovoltaic module to obtain an infrared image sequence; the image processing module is used for acquiring an electroluminescent image of the photovoltaic module based on the infrared image sequence; and the defect detection module is used for obtaining a defect detection result of the photovoltaic module based on the electroluminescent image. Daytime detection of hidden defects of the photovoltaic module can be realized, and convenience and timeliness of defect detection of the photovoltaic module in a daytime environment are greatly improved.

The invention relates to a robust capture method and system for a deep pseudo-random sequence with a stop judgment function, in particular to a robust capture method and system for an m-sequence codebook of an important pseudo-random sequence for a direct sequence spread spectrum technology. The invention discloses an iMPA pseudo code capturing method and system with stop judgment based on a state backtracking and phase estimation technology under sliding window overlapping state estimation, and belongs to the field of communication signal processing. According to the method, a probability signal processing technology and m sequence construction features are combined, the capturing method which can achieve a better capturing effect under a limited number of receiving chip observation values and remarkably shorten the capturing time of a long PN sequence is designed in a probability domain, and the implementation complexity and the capturing time delay brought by related operation in a traditional pseudo code capturing algorithm can be reduced.

The present application relates to the technical field of wireless communications, and in particular to a communication method and a communication apparatus. The method comprises: a first communication apparatus sends a first PPDU, and correspondingly, a second communication apparatus receives the first PPDU, wherein the first PPDU comprises an LTF, and the LTF is determined on the basis of a pseudo-random sequence; and the second communication apparatus performs channel measurement on the basis of the first PPDU. The accuracy of channel measurement can be improved. The present application can support IEEE protocols, such as an IEEE 802.11be / Wi-Fi 7 / EHT protocol, an IEEE 802.11bn / UHR / Wi-Fi 8 protocol, an IEEE integrated millimeter wave (IMMW) protocol, an IEEE 802.15 / UWB protocol, or an IEEE 802.11bf / sensing protocol. The technical solution provided in embodiments of the present application can also be applied to a NearLink system, and support a NearLink standard protocol.

Calibration method for a conversion chain of an analog signal receiver and corresponding analog signal receiver. The invention relates to a calibration method (200) for a conversion chain (12) of an analog signal receiver (10), comprising the generation (205) of a pseudo-random sequence (S) of states used for the formation (210) of a frequency-modulated analog calibration signal (ANA_cal,mod); the injection (215) of this calibration signal into the conversion chain (12); the formation of a digital signal to be processed (NUM_BB) by demodulation (220) of an intermediate digital signal (NUM_int) received in response to the modulated analog calibration signal (ANA_cal,mod); the determination (225) of a correlation function R(NUM_BB,S) between the digital signal to be processed (NUM,BB) and the pseudo-random sequence (S);the determination (230) of a transfer function (H) of the conversion chain from the correlation function R(NUM_BB,S); and if necessary, the determination (235) of a parameter (Ci) of an output processing step from the transfer function (H). Figure for the abstract: 1;

This application discloses a half-duplex protocol synchronization control method and system based on out-of-band digital keying features, relating to the field of digital communication and network protocols. The method includes: setting a sub-band outside the main data carrier band; generating a pseudo-random sequence containing local node identifiers, timestamps, and channel coordination information, and modulating it into an out-of-band digital keying signal, which is then combined with the main data signal to form a radio frequency signal for transmission; during node transmission, acquiring a mixed signal superimposed on the local transmission component and the external radio frequency signal via split-feed and monitoring the receiving path, and performing out-of-band filtering, demodulation, and weighted cross-correlation detection to suppress local transmission interference, identify external node sequences, obtain arrival time peaks, and parse external identifiers, timestamps, and coordination control information; calculating the time deviation based on the local receiving time, completing clock synchronization correction, and adjusting the transmission state and link time slot scheduling. This improves the synchronization sensing capability and coordination control reliability during transmission.