91 results about "Phase-shift keying" patented technology

The invention relates to the technical field of navigation signal analysis, in particular to a QPSK (Quadrature Phase Shift Keying) non-cooperative navigation signal analysis method and a QPSK non-cooperative navigation signal analysis system for multi-domain feature joint estimation. Traversing phases in the phase sequence in sequence, and obtaining an energy threshold value in combination with the center frequency estimation value of the current section; performing iterative analysis on the frequency and the phase to obtain estimated values of the frequency and the phase; obtaining a complex baseband signal through the estimated values of the frequency and the phase; judging whether IQ code crossing occurs or not according to a cross-correlation relationship between the complex baseband signal and a local code stream sequence, and if the code crossing occurs, performing adjustment to obtain a corrected I-path baseband signal and a corrected Q-path baseband signal; adjusting the length of a chip through a code rate so as to reconstruct a code element sequence and obtain I-path and Q-path pure code element sequences; and taking the I-path and Q-path pure code element sequences as analysis results of the non-cooperative navigation signals. According to the invention, the accuracy of analyzing the non-cooperative navigation signal is improved.

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.

The present disclosure provides a method (100) in a network device. The method (100) includes: transmitting (110) Downlink Control Information, DCI, to a terminal device, the DCI containing information from which a TBS index is derivable. The BS index is usable to determine a TBS from a set of TBSs including TBSs usable with Quadrature Phase Shift Keying, QPSK, and TBSs usable with 16-Quadrature Amplitude Modulation, 16-QAM. When the DCI is for a Narrowband Physical Downlink Shared Channel, NPDSCH, the TBSs usable with 16-QAM are determinable by the terminal device based on a deployment mode.

The invention discloses an interference communication integrated waveform generation method based on spectrum dispersion-multi-system phase shift keying. The problems of difficult communication information demodulation and high hardware implementation complexity in interference communication integration research are mainly solved. According to the scheme of the invention, the SMSP interference signal is formed by periodically expanding the chirp signal on the time domain, the communication information is modulated on the phase of the chirp signal, and the plurality of chirp signals carrying the communication information can cause dense false target interference at random positions on the radar, so that the interference and communication integrated signal is generated. At a communication receiving end, a first linear frequency modulation signal is adopted to perform carrier synchronization, so that the synchronization effect can be improved by using the high time width-bandwidth product characteristic of the linear frequency modulation signal, and communication information can be demodulated directly by using a coherent demodulation mode; at a radar receiving end, the signal can generate a radar interference effect with dense false target characteristics.

This invention discloses a simple, multifunctional, integrated 5G analog fronthaul in-band full-duplex communication method for remote units (RUs). This method primarily relates to the fields of optical communication technology and microwave technology. The system structure of the method, as shown in Figure 1 of the specification, includes a laser, downlink vector signal, electrical local oscillator signal, downlink interference signal, target signal, reference signal, 90° electrical coupler, dual-polarization quadrature phase-shift keying modulator, phase modulator, single-mode fiber, optical coupler, polarization beamsplitter, polarization beam combiner, polarization controller, polarizer, and photodetector. The remote unit (RU) uses a single phase (PM) modulator to achieve self-interference cancellation (SIC) combined with anti-fiber dispersion transmission and down-conversion, eliminating the need for bias control and additional local oscillator (LO) branches, resulting in a simple structure. At the central office (CO), the carried downlink signal and local oscillator signal are single-sideband modulated to achieve anti-fiber dispersion transmission. The RU uses wavelength reuse technology to perform PM cascaded down-conversion on the signal received from the uplink, and the SIC is moved from the RU to the CO to simplify the RU. The entire link has no optical filter and is reconfigurable.

The invention relates to a phase shift keying signal positioning method based on co-prime sum-difference common-array compensation. Direction of arrival estimation wide in estimation range and high in estimation precision is achieved. After a non-circular signal is received through an array antenna of an augmented co-prime array structure, the non-circular signal is subjected to digital processing to obtain a digital signal, and an augmented co-prime array comprises a first sub-array and a second sub-array; carrying out covariance matrix calculation on the digital signal and vectorizing a covariance matrix to obtain a difference comatrix and a sum comatrix; determining redundant array elements according to the structure that the array elements in the augmented co-prime array are removed without influencing the difference coordination array, and repositioning the redundant array elements to obtain a third sub-array and a fourth sub-array; translating all the sub-arrays by an optimal shift distance to obtain a converted augmented co-prime array structure; and estimating the direction of arrival by adopting the MUSIC algorithm again according to the conversion augmented co-prime array to obtain the direction of arrival.

This disclosure provides a signal processing method and system for continuous-variable quantum key distribution, relating to the field of communication technology. The method includes: up-converting two double-sideband quadrature phase-shift keying (PSK) signals to a first center frequency and a second center frequency, respectively, to form a first quantum signal in the X-polarization direction and a first quantum signal in the Y-polarization direction; adding a first pilot signal in the X-polarization direction to the first quantum signal in the X-polarization direction to obtain a first optical signal in the X-polarization direction; adding a first pilot signal in the Y-polarization direction to the first quantum signal in the Y-polarization direction to obtain a first optical signal in the Y-polarization direction; using a polarization coupler to combine the first optical signal in the X-polarization direction and the first optical signal in the Y-polarization direction into a polarization multiplexed signal; and transmitting the polarization multiplexed signal to a receiver through a quantum channel. According to embodiments of this disclosure, the security key rate of continuous-variable quantum key distribution can be improved.

The application discloses a kind of detection communication integrated collision avoidance sonar signal design method and device, its method includes: modulating continuous frequency phase shift keying signal CFPSK, generates initial frequency and Chirp signal;Modulate continuous frequency phase shift keying signal, BPSK signal is modulated to Chirp by phase modulation two-way, then two-way signal is added, obtains final transmitting signal;After CFPSK signal is pulse width modulated, it is emitted by the transducer of collision avoidance sonar;Collecting collision avoidance sonar original echo signal, obtains original echo data;Original data collected is preprocessed, and two-way signal of virtual and real is obtained;Signal is compressed into short pulse bandwidth signal, generates the impulse response parameter of two groups of matched filters, each group is matched with virtual and real two-way signal to obtain four groups of matching results, and the final matching output is obtained from real number field to complex number field;The starting point of CFPSK signal is determined by detecting the peak position of matched filter output, and echo signal is accurately intercepted from received signal for communication decoding, and coherent detection is carried out on received signal and reference carrier.The application realizes the cooperative work of detection and communication function.

The present invention discloses an alternative method for QPSK signal carrier synchronization, which mainly solves the problems of poor real-time performance and complex implementation of existing carrier synchronization technologies. Its implementation scheme is: in response to the needs of QPSK signal carrier synchronization, a sine signal and a cosine signal of the phase difference are calculated in real time; the phase difference interval is determined based on the obtained sine signal and cosine signal, and four phase shifts are performed on the received signal to obtain four interval signals; according to the phase correspondence between the four interval signals and the baseband signal at different phase differences and the determined phase difference interval, a certain interval signal that is in phase with the baseband signal is selected for output, and the sign bit of each interval signal is taken to finally restore the baseband signal. Compared with the existing carrier synchronization method, the present invention has good real-time performance, low processing delay, simple implementation, small amount of calculation, low resource consumption, and strong adaptability to deviation changes. It can be used for fast demodulation of QPSK signals in high-dynamic large-deviation Doppler frequency shift scenarios.

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) communication method, device and system, and the method comprises the steps: generating a transmission frame which comprises a plurality of OFDM symbols; a first OFDM symbol of the transmission frame is a synchronous pilot symbol, and a second OFDM symbol is a reference pilot symbol; based on the transmission frame, configuring at least two demodulation modes according to channel conditions or communication requirements; when the first demodulation mode is configured, the receiving end performs differential phase shift keying differential demodulation on subsequent data symbols based on the reference pilot symbols; and when a second demodulation mode is configured, the receiving end performs channel estimation by using the reference pilot symbol, and performs quadrature amplitude modulation equalization and demodulation on subsequent data symbols according to a channel estimation result. According to the invention, ultralow pilot frequency overhead can be realized, the pilot frequency overhead is compressed to only two symbols, a synchronization sequence and a reference pilot frequency sequence in each frame, and the frequency spectrum utilization rate is greatly improved.

This application provides a short-range wireless communication method and a related device. The method includes: generating a transmission frame. The transmission frame includes a frame header and a data domain, phase shift keying modulation is used for the frame header, and quadrature amplitude modulation or phase shift keying modulation is used for the data domain. The method includes sending the transmission frame. In this application, the phase shift keying modulation is used for the frame header of the transmission frame, and the phase shift keying modulation or the quadrature amplitude modulation with a same bandwidth is used for the data domain.

A phase shift keying modulator. The modulator comprises: a plurality of silicon waveguides provided in a device layer of a silicon-on-insulator platform, the silicon-on-insulator platform including one or more cavities; one or more III-V semiconductor based devices located within the one or more cavities of the silicon-on-insulator platform, each III-V semiconductor-based device including a III-V semiconductor based waveguide which is coupled at an input end to one of the plurality of silicon waveguides and coupled at an output end to another of the plurality of silicon waveguides, each III-V semiconductor based waveguide comprising an active phase modulating portion; and one or more contacts in electrical contact with each active phase modulating portion, such that the phase shift keying modulator is operable to modulate the phase of an optical wave passing through each active phase modulating portion.

The invention relates to the field of wireless power transmission, and discloses a multi-tone phase shift keying modulation method and receiving device for information energy transmission, and the device comprises a receiving unit which is used for receiving a multi-tone phase shift keying radio frequency signal; the integrated receiving rectifier is connected with the receiving unit, comprises a matching network, a Schottky diode and a low-pass filter, and is configured to convert the multi-tone phase shift keying radio frequency signal into a direct current output and a baseband frequency signal; and the demodulation unit is connected with the output end of the integrated receiving rectifier and is configured to demodulate symbol information based on the phase of the frequency signal. According to the invention, the power consumption and complexity of the receiving end are reduced, the power conversion efficiency is improved, the output fluctuation can be effectively reduced, the method is suitable for low-power-consumption wireless communication scenes such as Internet of Things terminals, and the dual requirements of wireless information transmission and energy transmission are effectively considered.

The invention discloses a PLC interactive wireless signal conversion method and system, and relates to the technical field of PLC communication protocol conversion, and the method comprises the steps: analyzing a space-time pulse sequence, recognizing and extracting a core control element, and forming triple data; calculating a chaos state variable in real time based on a Lorentz differential equation set, and mapping the chaos state variable into a carrier frequency offset; injecting the triple data into a carrier modulator, obtaining a dynamic carrier frequency through a carrier frequency offset and a basic frequency, and performing phase shift keying modulation to generate a radio frequency signal; inputting the demodulated triple data into a pulse neural network for decoding, reconstructing an original industrial protocol data stream, and outputting the original industrial protocol data stream to a second PLC through an Ethernet port to execute a control instruction; the communication robustness and the decoding accuracy are improved; the wireless signal has adaptive frequency hopping capability and higher spectrum utilization rate, and the communication stability and real-time response performance under the industrial field multi-interference condition are obviously enhanced.

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.

The application relates to a dynamic signal modulation method, device and equipment based on amplitude phase shift keying. The method comprises the following steps: obtaining original data of a dynamic signal. After the original data is encoded by using a forward error correction algorithm, the amplitude and the phase of the original data after the correction coding are obtained according to the channel state information at the current moment and a preset optimization target function, and a first dynamic signal is obtained. The first dynamic signal is input into a composite modulator to convert the amplitude phase shift keying modulation format, and amplitude phase shift keying modulation symbols are obtained. The amplitude and the phase corresponding to the amplitude phase shift keying modulation symbols are modulated respectively, and a second dynamic signal is generated. The modulation parameters of the second dynamic signal are optimized according to the bit error rate fed back by a receiving end and the signal-to-noise ratio at the current moment, the signal output interface is configured according to the optimized modulation parameters, and an optimal dynamic signal is output. By using the method, the spectrum utilization rate and the transmission stability of the dynamic signal can be improved.

A sourceless co-packaged optical-electrical chip can include a plurality of different optical transceivers, each of which can transmit to an external destination or internal components. Each of the transceivers can be configured for a different modulation format, such as different pulse amplitude, phase shift key, and quadrature amplitude modulation formats. Different light sources provide light for processing by the transceivers, where the light source and transceivers can be configured for different applications (e.g., different distances) and data rates. An optical coupler can combine the light for the different transceivers for input into the sourceless co-packaged optical-electrical chip via a polarization maintaining media (e.g., polarization maintaining few mode fiber and polarization maintaining single mode fiber), where another coupler operates in splitting mode to separate the different channels of light for the different transceivers according to different co-packaged configurations.

The invention discloses a harmonic extraction method and device based on an improved orthogonal phase-locked loop, a terminal and a medium, and the method comprises the steps: collecting a three-phase voltage signal, and carrying out the preprocessing of the three-phase voltage signal; calculating the frequency fluctuation quantity according to the fundamental frequency tracked by the orthogonal signal generator; based on the damping coefficient, processing the preprocessed signal through an orthogonal signal generator to generate an orthogonal signal; carrying out notch suppression on the preprocessed signal and the orthogonal signal, and optimizing a damping coefficient; park transformation is carried out on the preprocessed signals and orthogonal signals, and fundamental wave parameters are output through a PI regulator; configuring a central angular frequency for each to-be-extracted harmonic component based on the fundamental wave parameter, and calculating a harmonic amplitude and a phase; through the improved orthogonal signal generator, the fundamental wave phase locking anti-interference performance is improved, the fundamental wave phase locking error is reduced, and extraction deviation caused by frequency fluctuation is avoided.

The invention discloses a frequency modulation differential chaos phase shift keying communication method based on cyclic spectrum analysis and a related device. According to the invention, a block-level processing cyclic shift index and cosine frequency index dual modulation mechanism is introduced into a traditional DCSK framework, cyclic shift operation is carried out on a reference segment, cosine sequence multiplicative weighting is carried out on a frequency modulation emission sequence, and a detectable cyclostationary characteristic is introduced through a controllable cosine normalization frequency parameter, so that the accuracy of the frequency modulation transmission sequence is improved. Additional information bits are mapped to the shift index and the frequency index, so that the spectrum efficiency is remarkably improved; meanwhile, by using codebook coding of index bits, effective load bits are increased, the misjudgment probability is reduced, the communication reliability is effectively improved, and the technical problem that spectrum efficiency and general reliability are difficult to consider at the same time in an existing chaotic communication scheme is solved.

The invention discloses a signal denoising and carrier synchronization method and device of a continuous wave mud pulse system, and belongs to the field of measurement while drilling in petroleum drilling. The method comprises the following steps: S1, preprocessing a collected mud pulse signal; s2, adjusting a noise covariance matrix of an adaptive Kalman filter in real time based on an expectation maximization algorithm, and reconstructing and filtering harmonic waves of each order of pump noise through a pump noise linear time-invariant space state model by using the adjusted adaptive Kalman filter; s3, filtering random noise by adopting a wavelet threshold denoising method; s4, performing frame synchronization on the denoised signal by using the m sequence; s5, demodulating the mud pulse signal by adopting a BPSK (Binary Phase Shift Keying) orthogonal demodulation technology; and S6, adjusting a noise covariance matrix of the unscented Kalman filter in real time based on an expectation maximization algorithm, and estimating and compensating the phase offset by using the adjusted unscented Kalman filter through the nonlinear state space model of the phase offset and the frequency offset.

A data processing device is provided, including a spectrum extraction circuit configured to receive a first electrode signal and obtain a first component signal having a first preset frequency in the first electrode signal; an amplitude and phase extraction circuit, electrically connected to the spectrum extraction circuit, configured to generate a differential phase-shift keying signal, the differential phase-shift keying signal includes a real part of phase and an imaginary part of phase of the first component signal; a demodulation circuit, electrically connected to the amplitude and phase extraction circuit, configured to demodulate the differential phase-shift keying signal according to a phase angle to obtain data information in the first electrode signal, the phase angle is an arctangent value of a ratio of the real part of phase to the imaginary part of phase.

This invention discloses a harmonic extraction method, apparatus, terminal, and medium based on an improved quadrature phase-locked loop (QPL). The method includes: acquiring three-phase voltage signals and preprocessing them; calculating frequency fluctuations based on the fundamental frequency tracked by a quadrature signal generator; generating quadrature signals by processing the preprocessed signals using the quadrature signal generator based on a damping coefficient; performing notch filtering on the preprocessed signals and the quadrature signals to optimize the damping coefficients; performing Park transform on the preprocessed signals and the quadrature signals, and outputting fundamental parameters through a PI controller; configuring a center angular frequency for each harmonic component to be extracted based on the fundamental parameters, and calculating the harmonic amplitude and phase. This invention improves the fundamental phase-locked loop's anti-interference capability through an improved quadrature signal generator, reduces fundamental phase-locking errors, and avoids extraction deviations caused by frequency fluctuations.

This invention discloses a DPSK receiver for adapting to the defect of undesirable carrier frequency variation over time in the presence of a transmitter. The aim of providing an apparatus and method for adapting the receiver to transmitter defects is thus achieved. The frequency offset estimation unit includes a first phase estimation unit, a second phase estimation unit, and a clean / dirty selector, wherein a first phase error estimate e is output. dirty (k) The first phase estimation unit includes a first frequency offset estimation low-pass filter, the bandwidth of which is wider than the bandwidth of the second frequency offset estimation low-pass filter in the second phase estimation unit. The second phase estimation unit outputs a second phase error estimate e. clean (k), the dirty / clean selector is configured to compare the ratio of the second phase error estimate to the first phase error estimate with a threshold T and output a binary comparison result c(k). The demodulation reference estimation unit includes a first filter and a second filter, wherein the filter bandwidth of the first filter, which is part of the “dirty” reception path of the receiver, is wider than the filter bandwidth of the second filter, which is part of the “clean” reception path of the receiver. If the ratio of the second phase error estimate to the first phase error estimate is lower than the threshold T, the “clean” reception path is used to output the received information bits; otherwise, the “dirty” reception path is used.

An efficient structure and methodology are provided for coherent signal processing in optical access networks. Differential phase-shift keying (DPSK) modulation is used for coherent passive optical networks. The use of DPSK modulation can reduce the complexity of a receiver of an optical network unit by improving the receiver tolerance to frequency offsets. A system can comprise an optical line terminal having a coherent transmitter configured to transmit an optical signal over an optical fiber channel to a coherent receiver in an optical network unit of a passive optical network, and a DPSK modulator coupled to the coherent transmitter to code the optical signal transmitted. The coherent receiver of the optical network unit of the passive optical network can be coupled to a DPSK demodulator.

Methods, systems, and devices for wireless communications are described. The described techniques may enable a receiving device to de-map a set of mapped bits by selecting, for a point on a received signal, a subset of constellation points of a constellation with which to perform a soft decision. The subset of constellation points may include a closest constellation point to the point on the signal, an origin of the constellation, one or more constellation points that are a same distance from an origin of the constellation as the closest constellation point with different angles from an axis of the constellation, or a same angle from the axis of the constellation as the closest constellation point with different distances from the origin of the constellation, and a constellation point that is opposite to the closest constellation point in the constellation.

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 a multi-domain feature fusion communication signal modulation identification method based on deep learning, and belongs to the technical field of communication signal processing. The method comprises the following steps of: extracting a multi-domain feature vector from a complex baseband signal, wherein the multi-domain feature vector covers six categories including a time domain statistical feature, a frequency domain feature, a high-order cumulant feature, a differential phase feature, an I / Q component feature and a PSK (Phase Shift Keying) special feature; constructing a training data set by adopting a logarithmic space uniform sampling strategy, and realizing balanced coverage of a cross-order-of-magnitude symbol rate; and inputting the extracted feature vectors into a layer-by-layer dimensionality reduction neural network adopting a decline Dropout strategy for classification and identification. According to the method, the systematic coverage of 32 modulation types covering nine categories is realized, the natural immune characteristic of the high-order cumulant to additive white Gaussian noise is fully utilized, and the method has the advantages of wide identification range, strong anti-noise capability and good generalization performance.

The application discloses a radar communication integrated waveform design method and device, and the method comprises the following steps: firstly, generating a DFC sequence and an LFM waveform; then, generating a DFC-LFM waveform according to the DFC sequence and the LFM waveform; then, mapping communication information of a radar communication process to phase shift keying; then, generating a joint coding waveform of the DFC-LFM waveform and the phase shift keying according to the DFC-LFM waveform and the phase shift keying; and finally, generating a RadCom waveform according to the joint coding waveform. The application can provide a low-interception and anti-interference RadCom waveform, improves the anti-interference performance of the radar, and can be widely applied to the technical field of communication.

This invention discloses a differential chaotic phase-shift keying waveform design method and modulation / demodulation method suitable for integrated communication and sensing. In this invention, the reference subcarrier and data subcarrier within the same subcarrier group share the same chaotic reference sequence, allowing the receiver to recover the original data using the existing OFDM-DCSK incoherent detection structure. Simultaneously, based on the Riemann matrix-based group selection mapping method, by constructing a constant complex weight vector within the group, multiple OFDM-DCSK time-domain candidate waveforms are generated and selectively transmitted without changing the OFDM-DCSK system's "reference-data equal-weight spread spectrum" structure and the receiver's incoherent demodulation method, thus achieving effective suppression of PAPR in the transmitted waveform. Using the OFDM-DCSK time-domain candidate waveforms as a unified baseband signal, incoherent communication and radar sensing functions are simultaneously realized with a single hardware and spectrum resource.

A terminal according to one aspect of the present disclosure comprises: a reception unit that receives an instruction corresponding to a codebook generated using 8 Phase Shift Keying (PSK), 16 PSK, or 32 PSK; and a control unit that controls uplink (UL) transmission using the codebook. According to one aspect of the present disclosure, it is possible to improve the performance of precoding used for UL transmission.