57 results about "Phase-shift keying" patented 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.

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.

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.

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 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.

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.

Systems and methods are disclosed for transmission and reception of backscattering signals using 2K Phase Shift Keying (PSK) (2K-PSK) modulation and / or multiple access techniques.

Reduced complexity maximum likelihood sequence detectors (rMLSDs) for detecting multi-bit symbols, such as symbols found in pulse amplitude modulation (PAM), quadrature amplitude modulation (QAM), and phase shift keying (PSK) signal constellations with more than two constellation points, are disclosed. One illustrative digital communication receiver includes an initial equalizer that derives an initial sequence of symbol decisions from a filtered received signal, each symbol decision in the initial sequence having a second possible symbol decision, and an rMLSD that derives a final sequence of symbol decisions by evaluating a state metric for only each symbol decision in the initial sequence and its second possible symbol decision.

The invention provides a communication method and a communication device. The method comprises the following steps: performing uplink transmission / downlink transmission with access network equipment; wherein whether the uplink transmission / downlink transmission between the access network equipment and the terminal uses the differential amplitude phase shift keying (DAPSK) or a related modulation mode of the differential phase shift keying (DPSK) is related to a first parameter of the uplink transmission / downlink transmission, and the first parameter comprises one or more of the following items: bandwidth, subcarrier spacing and modulation and coding scheme (MCS). Therefore, on the basis of the method, whether the uplink transmission / downlink transmission uses the related modulation mode of the DAPSK or the DPSK can be determined on the basis of the actual communication condition. The related modulation mode of DAPSK or DPSK can be used more flexibly, and the transmission performance of a communication system can be improved.

A system for radio frequency (RF) residual sideband (RSB) calibration includes a complex (in-phase / quadrature (I / Q)) signal receiver; a signal generator configured to generate a transmit (Tx) signal; a first phase shifter operably coupled to the real signal transmitter; a first signal combiner configured to combine a receive (Rx) signal with the transmit (Tx) signal to generate a first combined signal; a second phase shifter configured to provide a selected phase shift to the first combined signal; and a complex down converter configured to alternately generate an in-phase Rx signal and a quadrature Rx signal using the in-phase LO signal and the quadrature LO signal to generate one or more signals indicative of relative Tx-Rx LO phase (theta), amplitude (A), Tx LO I / Q phase mismatch (epsilon), Rx I / Q amplitude mismatch (alpha), and Rx I / Q phase mismatch () at the output of the complex receiver.

A radar device includes a transmitting antenna unit, a modulator, a receiving antenna unit, a receiver, and a processor. The transmitting antenna unit includes transmitting antennas. The modulator generates transmission signals respectively provided to the transmitting antennas by executing phase-shift keying through diverging the common signal into diverged signals having the number being equal to the number of the transmitting antennas and rotating respective phases of the diverged signals. The receiving antenna unit includes at least one receiving antenna. The receiver generates a received code of at least one received signal. The received code is acquired by encoding an appearance pattern of a peak of at least one received signal on a Doppler frequency axis. The processor generates information related to an object, according to the received code generated by the receiver. The modulator executes the phase-shift keying by using a linear block code as an assigned code.

A low-complexity method for soft-output detection of Amplitude Phase Shift Keying (APSK) modulated signals in wireless communications includes partitioning and ordering all APSK constellation points into rings of ordered Phase Shift Keying (PSK) constellation points; computing a distance squared between a first constellation point of the ordered PSK constellation points of each ring and a received signal according to coordinates of the constellation points and the received signal, and finding the first nearest constellation point corresponding to the smallest distance squared, and determining a maximum log-likelihood ratio constellation point label according to the first nearest constellation point; performing an iterative search strategy to search over the ordered irregular PSK constellation points, and finding a smallest corresponding distance squared and computing a log-likelihood ratio corresponding to each bit of a bit data. The bit data corresponds to the received signal.

Various aspects of the present disclosure relate to techniques for rate matching adaptation for polar-coded physical broadcast channel (PBCH). A network equipment is configured to encode a PBCH payload to generate a polar codeword according to a polar reliability sequence, select, based on a synchronization signal block (SSB) bandwidth, a rate matching pattern from a plurality of predefined rate matching patterns, perform bit-level rate matching on the polar codeword in accordance with the selected rate matching pattern, and map quadrature phase-shift keying (QPSK) symbols corresponding to the rate-matched polar codeword to resource elements of an SSB resource grid for transmission.

A method for detecting tonal interference in phase shift keyed signal modulations includes feeding a phase shift keyed signal with an error signal through a lock loop from a phase lock loop. The lock loop feeds the phase shift keyed signal with an error signal through a lock counter that counts a time for the error signal to measure a voltage below a minimum threshold. An enable signal is sent via the lock counter to the frequency channelizer module when the voltage drops below the minimum threshold. The frequency channelizer module splits a spectral content of the phase shift keyed signal into frequency channels. An output of the frequency channels is sent via the frequency channelizer module to a spectral anomaly processor. An automated test is performed with the spectral anomaly processor for each frequency channel, thereby determining a frequency or phase band of the tonal interference.

A data transmission method, a device, and a storage medium are disclosed. The method may include sending a Modulation and Coding Scheme (MCS) index value to a second communication node; where, the MCS index value is indicative of one sets of parameters of a plurality sets of parameters in an MCS index table; and at least one set of the plurality sets of parameters in the MCS index table correspond to Regular Amplitude Phase Shift Keying (RAPSK) modulation.

A system for radio frequency (RF) residual sideband (RSB) calibration includes a complex (in phase / quadrature (I / Q)) signal receiver, a signal generator configured to generate a transmit (Tx) signal, a first phase shifter operably coupled to the real signal transmitter, a first signal combiner configured to combine a receive (Rx) signal with the transmit (Tx) signal to generate a first combined signal, a second phase shifter configured to provide a selected phase shift to the first combined signal, and a complex downconverter configured to generate an in phase Rx signal and a quadrature Rx signal alternatively using an in phase LO signal and a quadrature LO signal to generate one or more signals indicative of relative Tx-Rx LO phase (θ), amplitude (A), Tx LO I / Q phase mismatch (ε), Rx I / Q amplitude mismatch (α), and Rx I / Q phase mismatch (φ) at the output of the complex receiver.

The invention discloses a correlation type optical time domain reflection signal processing method and system, and relates to the technical field of optical fiber sensing, and the method comprises the following steps: a transmitting end transmits a dual-polarization quadrature phase shift keying optical signal to an optical fiber; a receiving end obtains a coherent superposition signal of the dual-polarization quadrature phase shift keying optical signal reflected by each scattering point of the optical fiber through coherent detection; respectively calculating respective Jones vector inner products according to the dual-polarization quadrature phase shift keying optical signal and the coherent superposition signal, and performing preset correlation operation according to the Jones vector inner products of the dual-polarization quadrature phase shift keying optical signal and the coherent superposition signal to obtain a composite signal. Natural suppression of laser phase noise, obvious weakening of optical fiber front section common optical path disturbance and stable measurement insensitive to polarization state rotation can be realized.

Disclosed are a data transmission method, a communication node, and a non-transitory computer readable storage medium. The method is applied to a first communication node and may include: acquiring a first bit sequence f0, f1, f2, . . . , fE−1; mapping every Qm bits in the first bit sequence f0, f1, f2, . . . , fE−1 to one complex-valued modulation symbol based on a Regular Amplitude Phase Shift Keying (RAPSK) constellation to obtain a symbol sequence x0, x1, x2, . . . , xE / Qm−1, wherein E denotes a length of the first bit sequence and is a positive integer, Qm denotes a modulation order of RAPSK modulation, and the RAPSK constellation has 2Qm constellation points; and transmitting the symbol sequence x0, x1, x2, . . . , xE / Qm−1 to a second communication node.

Methods, systems, and devices for wireless communications are described. In some cases, a wireless device may communicate an indication that probabilistic shaping is to be applied to each ring of a set of rings of a geometric modulation scheme and an indication of a non-uniform distribution associated with the probabilistic shaping. Additionally, the wireless device may perform probabilistic shaping to map a set of information bits to a set of constellation points associated with the set of rings in accordance with the non-uniform distribution, where the non-uniform distribution indicates an unequal probability of the set of information bits being mapped to each ring of the set of rings. Thus, the wireless device may transmit a message based on a modulation symbol sequence that is generated based on the set of information bits mapped to the set of constellation points.