83 results about "Frequency-shift keying" patented technology

The invention provides an underwater acoustic communication dual-mode demodulation method and system based on minimum frequency shift keying, and the method comprises the steps: receiving an underwater acoustic signal, carrying out the preprocessing, and carrying out the channel estimation of a training sequence in the underwater acoustic signal; calculating a phase change index according to a channel estimation result; when the phase change index is higher than a set bit error rate threshold value, processing the received signal in an incoherent demodulation mode; and when the phase change index is lower than a set bit error rate threshold value, processing the received signal in a coherent demodulation mode. The method has the advantages that the problem of insufficient applicability of a single demodulation mode in different underwater acoustic communication environments is solved; it is ensured that the system maintains good communication performance under different channel conditions; the problem of information lag can be avoided, the limitation of a traditional single demodulation mode is broken through, and the reliability and robustness of the system in a variable underwater acoustic channel are remarkably improved.

The invention discloses a distribution network power line anti-interference communication method based on adaptive filtering, and belongs to the technical field of distribution network power line communication. According to the method, a communication signal adopting a frequency shift keying modulation mode is acquired from a power line coupler of a distribution network through a signal acquisition module, the communication signal is preprocessed by using a digital signal processing unit, spectral analysis is performed on the preprocessed signal, and characteristic parameters of interference noise are extracted; a coefficient vector of a finite impulse response adaptive filter is initialized based on the characteristic parameters, the order of the filter is in direct proportion to the reciprocal of the dominant interference frequency, fine adjustment is carried out based on noise energy distribution through a table look-up method or a linear mapping relation, and the weight coefficient of the filter is adjusted in real time in the communication process. The adjustment step length is dynamically adjusted according to the real-time estimated signal-to-noise ratio, and finally, the processed signal is output through the adaptive filter and data demodulation is carried out. The method is mainly used for improving the anti-interference capability and the communication reliability of the power private line communication of the distribution network.

The invention relates to the technical field of measurement while drilling, in particular to an MWD continuous wave measurement signal processing method and device, and the method comprises the steps: carrying out the modulation processing of an underground MWD continuous wave measurement signal, and obtaining an MWD continuous wave transmission signal; denoising the MWD continuous wave transmission signal twice; and extracting an MWD continuous wave measurement signal from the MWD continuous wave transmission signal after the two times of denoising. According to the invention, the MWD frequency-modulated continuous wave signal is modulated by using the FSK frequency-shift keying, the underground MWD continuous wave measurement signal is enhanced, the external interference resistance of the MWD continuous wave transmission signal in the transmission process is improved, and after the MWD continuous wave transmission signal is received at a wellhead, the MWD continuous wave transmission signal is transmitted to the wellhead. Interference of noise on extraction of the underground MWD continuous wave measurement signal is eliminated to the maximum extent through two times of denoising, so that the accurate underground MWD continuous wave measurement signal can be obtained, and a basis is provided for analyzing the MWD measurement while drilling signal.

The invention discloses a 2-FSK (Frequency Shift Keying) signal frequency amplitude detection method based on an FPGA (Field Programmable Gate Array), which relates to the field of communication systems and comprises the steps of signal acquisition, frequency analysis, amplitude spectrum conversion and amplitude estimation, frequency estimation, data output, signal preprocessing and frequency detection result calibration. In the acquisition step, signals are acquired by an eight-channel synchronous or sequential sampling technology; in the analysis step, frequencies are analyzed by a different-point FFT algorithm; in the conversion step, amplitude spectrums are obtained by processing spectrum conversion; in the estimation step, frequencies are calculated, verification and correction are carried out by a phase difference method; in the preprocessing step, a hardware filter is used to preprocess a signal, and in the calibration step, a detection result is calibrated and optimized according to a calibration formula. The method is high in detection precision, strong in real-time performance, high in detection speed, good in adaptability, low in cost, small in power consumption, beneficial to system integration and miniaturization and wide in application prospect in the field of communication and the like.

The invention provides a high-temperature-resistant communication circuit, a communication method of the high-temperature-resistant communication circuit and a chip, and belongs to the technical field of communication processing. The circuit comprises a full-bridge driving circuit which comprises a first input end, a second input end, a third input end, a fourth input end, an output end and a working end; the communication antenna is electrically connected with the output end of the full-bridge driving circuit; the communication antenna carries out communication by using a modulation mode of frequency shift keying or binary phase shift keying; the micro-processing unit is electrically connected with the first input end, the second input end, the third input end, the fourth input end and the working end respectively and used for controlling the magnitude and the time sequence of voltage signals input into the first input end, the second input end, the third input end and the fourth input end respectively, so that continuous alternating current is generated on the communication antenna; and the current is used for setting a threshold range for the working end. The high-temperature-resistant communication circuit is used for overcoming the defect that a communication circuit capable of achieving underground high-temperature resistance is lacked in the prior art.

The invention relates to the field of FSK open set signal modulation identification, in particular to an FSK open set signal modulation identification method based on comparative learning. The scheme comprises the following steps: performing analog simulation on different FSK (Frequency Shift Keying) modulation modes to generate corresponding signals, calculating the self-power spectral density of each generated signal, combining the signals, the spectral density and label information, constructing a data set, performing data preprocessing, and sending the data into a contrast learning network for training to obtain a trained deep learning model; reasoning training set data by using the model, extracting a feature vector of each signal, mapping high-dimensional feature data to a two-dimensional space through t-SNE dimensionality reduction, calculating a clustering centroid of each modulation mode, obtaining a feature vector of a to-be-measured signal, performing t-SNE dimensionality reduction on the feature vector, and calculating an Euclidean distance with the centroid of each modulation mode, so as to obtain a to-be-measured signal; and judging the modulation type of the signal according to a set threshold value. The method is suitable for FSK open set signal modulation identification.

The invention relates to a method for rapidly turning off a pulsed light cavity ring-down system light source based on frequency shift keying, belongs to the technical field of cavity ring-down spectroscopy, and aims to couple laser generated by a laser light source into a ring-down cavity and realize the function of rapidly and conveniently turning off an optical signal coupled into the ring-down cavity by utilizing the frequency selectivity of the ring-down cavity and combining the frequency shift keying technology. An oscilloscope is used for observing and recording a ring-down signal, when a detection signal reaches a set trigger threshold value, a positive pulse trigger signal is output to a signal generator to start frequency shift keying, and the frequency of incident light is modulated, so that a light source coupled into a ring-down cavity is cut off. According to the invention, an extra circuit control plate is not needed to turn off the current of the laser driver, and a solution is provided for rapidly turning off the laser source in the pulsed cavity ring-down technology.

An audio authentication and identity verification system and method that encodes dynamic cryptographic information across the audible and inaudible spectrum (0 Hz→30 kHz, scalable to 124 kHz). A rolling acoustic signature simultaneously embeds identity, time, date, and GPS location using a hybrid of frequency shift keying (FSK), phase shift keying (PSK), Morse style pulse duration modulation, and time domain multiplexing. To guarantee post-event privacy and integrity, the system further incorporates a dual custody audio architecture in which every authenticated recording is split into complementary bit interleaved segments stored separately, and the decryption key is fragmented via Shamir 3-of-5 secret sharing—preventing unilateral access or tampering. The system establishes a tamper proof, real time, and offline capable authentication layer that functions in air, through conventional microphones, and via dedicated emitter hardware.

According to various embodiments of the present disclosure, a method performed by a first device is provided, the method comprising the steps of: transmitting, to a second device, information of a frequency shift keying (FSK) set including multiple frequency shift (FS) values from among a plurality of FS values, the multiple FS values being all or some of specific FS values supported by the second device; and receiving, from the second device, a modulation signal to which the FSK set is applied.

The invention discloses a communication signal processing method and device, equipment and a storage medium, and relates to the technical field of wireless communication physical layer transmission, and the method comprises the steps that a transmitting end determines a reference sequence and a spread spectrum sequence based on waveform parameters and spread spectrum factors of a Gaussian minimum frequency shift keying waveform of a communication signal; enabling the spread spectrum sequence to correspond to the reference sequence, and constructing a spread spectrum sequence mapping table according to a corresponding relation; and performing shift mapping on an original information sequence of the communication signal according to the reference sequence and the spread spectrum sequence mapping table to obtain a spread spectrum sequence, modulating the spread spectrum sequence, and sending a corresponding modulated signal to a receiving end, so that the receiving end demodulates and de-spreads the modulated signal. Therefore, the method and the device can support non-spread spectrum and transmit-receive communication with different spread spectrum factors, and can obtain spread spectrum gain more fully.

The present disclosure provides a method for transferring wireless power to a wireless power receiver that is performed by a wireless power transmitter in a wireless power transmission system, and a device using same, wherein the wireless power transmitter transmits, to the wireless power receiver, information on whether the wireless power transmitter supports fast frequency shift keying (FSK), and receives a specific request (SRQ) packet for the fast FSK from the wireless power receiver, wherein the SRQ for the fast FSK is received on the basis of the wireless power transmitter supporting the fast FSK, and FSK communication is performed on the basis of the fast FSK.

The invention relates to a controllable code sending device for simulating track signals, which comprises a processor, an FSK (Frequency Shift Keying) signal generation module and a signal amplification circuit which are connected in sequence, and also comprises a power amplifier board, a recovery circuit and a comparison circuit, and the input end of the power amplifier board is connected to the output end of the FSK signal generation module; the output end is connected to the input end of the recovery circuit and the input end of the comparison circuit, the output end of the recovery circuit is connected to the processor, the output end of the comparison circuit is connected to the FSK signal generation module, and the processor is further connected to the upper computer; and the power amplifier board collects the FSK signal output by the FSK signal generation module and forwards the FSK signal to the recovery circuit and the comparison circuit. Compared with the prior art, the system has the advantages that the stoping circuit and the comparison circuit are added, and the signals generated by the FSK signal generation module can be stoped, compared and shaped, so that the accuracy and reliability of the generated FSK signals are improved.

This invention relates to a biomimetic compound eye wide-area sensing and communication system for unmanned swarms, comprising a collaborative optical signal modulation and transmission unit, a wide-area biomimetic compound eye photoelectric sensing unit, and a spatial optical communication and positioning calculation unit. By structurally encoding control commands and employing frequency shift keying modulation, digital information is converted into near-infrared modulated optical signals, enabling spatial information propagation. The receiving end utilizes a biomimetic compound eye structure to converge wide-area field-of-view optical signals and completes photoelectric conversion through a spatial position sensor. Multi-channel signal processing is combined to achieve communication signal demodulation and feature extraction. Based on this, multi-dimensional features are constructed and spatial position calculation is performed, realizing integrated information interaction and relative position perception between nodes. This invention does not rely on radio frequency communication links and satellite navigation systems. In complex electromagnetic countermeasures and navigation-constrained environments, it can achieve stable communication and collaborative sensing for unmanned swarms, possessing advantages such as strong anti-interference capability, good concealment, and high environmental adaptability.

The invention discloses a dual-frequency dual-channel synchronous current generation method and device, and belongs to the field of electrical equipment and electrical engineering, and the method comprises the following steps: converting hexadecimal information needing to be sent into binary information through a main control unit; the main control unit performs frequency shift keying modulation on the binary information aiming at the two communication frequency bands to obtain two paths of modulation signals; mixing the two paths of modulation signals, outputting one path of pulse width modulation signal with a dual-frequency characteristic, carrying out direct current isolation and high voltage isolation processing on the pulse width modulation signal, and outputting the pulse width modulation signal to a metal oxide semiconductor field effect transistor; and the metal oxide semiconductor field effect transistor carries out resistor switching to generate characteristic current. The method can effectively resist the single-frequency interference problem, reduce the active heating value, support long-time injection without over-temperature protection, and can effectively resist the power-frequency interference.

The invention relates to the field of noise elimination, in particular to a method, a medium and equipment for eliminating FSK noise in a cockpit voice record. Comprising the following steps: determining whether an FSK noise section and a reference audio section on a to-be-processed recorded audio are background noise or not; if the FSK noise section and the reference audio section are both non-background noise, the frequency domain similarity between the first discriminant audio and the first reference audio is greater than a first similarity threshold, and the time domain similarity between the first discriminant audio and the first reference audio is greater than a second similarity threshold, determining that the first discriminant audio and the first reference audio are not background noise; if so, the audio of the FSK noise segment is replaced with the audio in the reference audio segment. According to the method, the characteristics of CVR multi-channel recording are utilized, the audio similarity of two microphone channels is compared, noise is eliminated in an automatic mode, the method is suitable for rapidly processing single or multiple records, and the cabin sound analysis efficiency is improved.

Methods, systems, and devices for wireless communication are described. Some wireless communication systems may support channel state information (CSI) reporting for frequency shift keying (FSK) modulated frequency modulated continuous waveforms (FMCW). A first network node may receive a first set of parameters for generating a CSI report associated with an FMCW communication type. The first network node may generate the CSI report according to the first set of parameters based on measurement information corresponding to an FMCW-based reference signal. The CSI report may indicate a second set of parameters for FSK-modulated (FMCW) communication between the first network node and a second network node. The first network node may send the CSI report to a second network node prior to the FSK modulated FMCW communication between the first network node and the second network node.

This disclosure relates to glitch suppression for FSK demodulation. According to an embodiment, a glitch suppression circuit includes a first-stage averaging circuit with programmable length, a second-stage averaging circuit, and a hysteresis comparator. The first stage uses a FIFO buffer to implement recursive shifting and averaging to process a binary input signal. The second stage provides moving average filtering. The hysteresis comparator uses a programmable threshold set based on the peak signal value to generate a clean output signal. This circuit removes glitches from the input signal of the frequency shift keying (FSK) demodulator while maintaining signal integrity at high bit rates. The programmable parameters allow for optimization based on desired glitch characteristics and system requirements.

The invention relates to a target sensing method based on a communication signal, and the method comprises the steps: receiving a communication signal transmitted by an active target, the communication signal being a signal combining frequency shift keying and linear frequency modulation spread spectrum modulation; carrying out carrier demodulation on the communication signal to obtain a double-channel baseband signal; performing digital beam forming processing on the double-channel baseband signal to obtain sum beam data and difference beam data; performing matched filtering processing on the sum beam data and the difference beam data; performing multi-pulse coherent accumulation processing on a matched filtering result to obtain distance-Doppler information; determining angle information of the active target based on a ratio relationship between the sum beam data and the difference beam data; and determining the distance, Doppler velocity and angle of the active target according to the distance-Doppler information and the angle information.

The invention provides a signal processing method and device, and aims to solve the problem of how to wake up a terminal or trigger a base station to wake up to provide service. The method provided by the embodiment of the invention comprises the following steps: sending a first signal for at least one of the following items: discovering a terminal; waking up the target cell; triggering the target cell to send and / or receive a first object, wherein the first object comprises at least one of a first target reference signal and a first target channel; triggering the target cell to switch to a first state; wherein the first signal comprises at least one of the following items: an on-off key (OOK) signal; an amplitude keying (ASK) signal; a frequency keying (FSK) signal; a phase shift keying PSK signal is provided.

A programmable digitally-controlled oscillator (DCO) for time-domain symbol generation is described in an embodiment. The programmable DCO comprising: an odd number (n) of multi delay cells (MDGs) to form a ring oscillator, the odd number (n) being equal to or more than three, and the odd number (n) of MDCs being adapted to generate n-1 number of multiplexed phases for phase shift keying (PSK) modulation, wherein each of the n number of MDCs comprises: two or more multi jitter cells (MJCs), each of the two or more MJCs being adapted to activate a corresponding delay for tuning a period of one cycle to represent a corresponding bit of a frequency shift keying (FSK) modulation, wherein each of the two of more MJCs comprises: two or more replica basic delay cells (BDCs) configured to adjust jitter, wherein each of the two or more replica BDC is adapted to provide a predetermined jitter target and comprises: two or more sets of reconfigurable inverter gates having different channel lengths and corresponding frequency ranges, the two or more reconfigurable inverter gates being selectable based on a target frequency range. A backscattered software-defined radio (SDR) transmitter system is also described in an embodiment.

Various embodiments relate to a PLL-based FSK demodulator, comprising: a PFD configured to receive an input signal; a fully differential auxiliary charge pump configured to receive and amplify the input signal from the PFD; a capacitor configured to filter the input signal from the auxiliary charge pump; and a fully differential limiter configured to demodulate the input signal and output recovered data.

A system includes a surface device, preferably positioned on a surface, a downhole device, and a wireline communications system. A downlink communication between the surface device and the downhole device occurs via Hopped Frequency Shift Keying (HFSK) voltage-modulated signals. An optional uplink communication between the downhole device and the surface device may occur via Frequency Shift Keying (FSK) current-modulated signals. The downhole device may comprise an addressable switch.

The invention discloses a baseband digital modulation device and method based on an FPGA (Field Programmable Gate Array) and a DDS (Direct Digital Synthesizer), relates to the technical field of telemetering systems, and aims to solve the problem of high signal sidelobe energy caused by adopting 2FSK (Frequency Shift Keying) modulation in the prior art. The device comprises an FPGA (Field Programmable Gate Array) and a DDS (Direct Digital Synthesizer), and the FPGA comprises a pre-modulation filtering module which is configured to convert a PCM (Pulse Code Modulation) signal input into the FPGA into a bipolar signal and perform pre-modulation filtering on the bipolar signal; a phase calculation module; the DDS configuration module is configured to configure a register and an interface signal of the DDS, so that the DDS works in a quadrature modulation mode. According to the method, 2FSK modulation is replaced by quadrature modulation, so that the signal sidelobe energy is effectively reduced, and the telemetering baseband signal finally output by the DDS has better out-of-band rejection capability.

The present disclosure relates to a technical field of signal processing, and provides a Gauss frequency shift keying (GFSK) signal receiving method and apparatus, an electronic device, and a storage medium. The GFSK receiving method includes: in a GFSK receiver, obtaining, based on a receiving end, a frequency value after phase differencing; performing inverse Gaussian filtering on a decoded frequency value through a preset inverse Gaussian filter, and obtaining a filtered frequency value, where the inverse Gaussian filter is a filter constructed based on composition information of a transmitted signal; and performing accumulation based on the filtered frequency value, making a decision, and obtaining decoded data of a received signal. The present disclosure can improve decoding performance of the GFSK receiver.

A receiver device comprises receiving circuitry configured to receive a radio signal modulated using frequency shift keying or phase shift keying, the radio signal comprising a plurality of successive symbol intervals, differential detector circuitry configured to multiply a signal for a current symbol interval with a first reference signal and output a first output signal for the current symbol interval, wherein the first reference signal corresponds to a conjugate of a signal for a first symbol interval preceding the current symbol interval and multiply the signal for the current symbol interval with a second reference signal and output a second output signal for the current symbol interval, wherein the second reference signal corresponds to a conjugate of a signal for a second symbol interval preceding the first symbol interval, in which the conjugate of the signal for the second symbol interval has been phase adjusted in dependence on a previous phase decision for the first symbol interval preceding the current symbol interval, combining circuitry configured to combine the first output signal for the current symbol interval and the second output signal for the current symbol interval to obtain a combined signal for the current symbol interval, and decision circuitry configured to output a phase decision for the current symbol interval in dependence upon the combined signal.

The invention discloses an underwater acoustic quaternary frequency shift keying signal carrier frequency estimation method, which comprises the following steps of: performing periodogram method power spectrum estimation on an underwater acoustic signal which is identified as quaternary frequency shift keying, and finding four frequency points with the strongest energy; the first frequency point, the second frequency point, the third frequency point and the fourth frequency point are sorted from small to large, and the difference values of the adjacent frequency points after sorting are calculated as the first difference value, the second difference value and the third difference value. The underwater acoustic quaternary frequency shift keying signal carrier frequency estimation method provided by the invention is established on the basis that an identified communication signal is a quaternary frequency shift keying signal, so that the carrier frequency estimation method provided by the invention only aims at the condition that the power spectrum frequency does not decline or declines by one in a periodogram method; when two or more frequencies are lost, the signal can be directly identified as other signals and cannot enter the process, so that the effects of minimum calculation amount, simplest implementation and highest estimation precision are achieved.

The application relates to the technical field of charging systems, and particularly discloses an electric energy / signal synchronous transmission system and method for electric vehicle charging piles, wherein the charging pile system is composed of multiple module stacks, and taking a double module as an example, the system comprises a charging pile module circuit 1, a charging pile module circuit 2, a signal generation system 1, a driving system 1, a signal demodulation system 1, a signal generation system 2, a driving system 2 and a signal demodulation system 2. The charging pile module circuit 1 comprises a three-phase full-bridge rectifier circuit 1, a double active bridge DC / DC circuit 1 and a double active bridge DC / DC circuit 2, and the charging pile module circuit 2 comprises a three-phase full-bridge rectifier circuit 2, a double active bridge DC / DC circuit 3 and a double active bridge DC / DC circuit 4. The application adopts a novel signal transmission mode, embeds signals into output voltage ripples by controlling the switching frequency of power tubes and combining a frequency shift keying modulation mode, and realizes bidirectional transmission of signals through modulation and demodulation of the output voltage ripples. The system electric energy and signal transmission share a coupling channel, the signal transmission process does not affect the output electric energy quality, meanwhile, the two double active bridge circuits in the module can be fully utilized for double-frequency parallel transmission, the signal transmission rate is increased, the system has good anti-noise capability, and the flexibility of system application is improved.

The present disclosure relates to high bit rate FSKD dither compensation circuit. According to embodiments, a wireless power receiving device includes a demodulator that generates carrier period data from a received frequency shift keying modulated signal having dither. A high pass filter circuit extracts offset values from the carrier period data. A polyphase filter circuit includes a plurality of smoothing filters and distributes the extracted offset values among the filters based on a dither pattern length. A compensation circuit stores smoothed offset values from the polyphase filter circuit in a dither table during an evaluation window and applies the stored values to compensate the carrier period data during a subsequent demodulation.

The invention discloses a DPSN open set modulation identification method based on instantaneous frequency feature extraction, and belongs to the field of radio communication signal modulation identification. The implementation method comprises the following steps: calculating the instantaneous frequency of a communication signal sample; on the basis of a P-GRU calculation unit, establishing a DPSN expansion parameter selection neural network model for modulation mode open set identification; the DPSN expansion parameter selection neural network model mainly comprises a feature extraction module and a classification layer module; carrying out feature extraction on the instantaneous frequency by the model, and carrying out sequence expansion and residual link in the feature extraction process; the extracted feature vectors pass through a classification layer of open set recognition, probability distribution P of classification labels is output, and the maximum value in P is the modulation mode label corresponding to the communication signal; outputting the label of the modulation mode to complete identification of the modulation mode; training to obtain a trained DPSN expansion parameter selection neural network model; and realizing frequency shift keying intra-class identification of complex electromagnetic environment signals and open set identification of non-frequency shift keying signals according to the trained model.

A transmission device that wirelessly communicates with a reception device includes an FSK modulation unit that performs frequency shift keying modulation on an input information bit sequence to generate a frequency shift keying symbol, a direct-sequence spreading unit that spreads the frequency shift keying symbol by direct-sequence spreading using a chirp sequence, and an FSK carrier spacing control unit that controls a signal to be transmitted to the reception device in such a manner as to prevent a delayed-wave component in multipath propagation from appearing in a frequency shift keying candidate carrier in one symbol of two consecutive symbols, in a frequency spectrum of a signal obtained by despreading in the reception device.