405 results about "Power ratio" patented technology

The invention relates to the technical field of electrical detection, in particular to an electricity meter load monitoring method and system based on an electric energy quality analyzer, and the method comprises the following steps: extracting three-phase voltage phase deviation characteristics in a disturbance period, combining with the comparison of a frequency band change trend and fundamental frequency power, recognizing an interference coupling section, and analyzing a jump frequency point; and outputting an ammeter load monitoring result. According to the method, the phase deviation angle of the three-phase voltage is extracted in the voltage disturbance period, and the cross-phase synchronization index is constructed, so that the synchronous response characteristics of different loads to disturbance can be accurately revealed, and the accuracy of load response attribution judgment is enhanced. On the basis of cross-phase synchronous analysis, a corresponding relation between frequency band characteristics and response attribution is constructed, so that load response subdivision has a phase difference identification capability and a frequency behavior calibration capability, and the discrimination robustness under a multi-source interference background is improved.

The invention relates to the technical field of power system communication, and discloses a fault diagnosis method and system for a substation communication network, and the method comprises the steps: obtaining multi-band signal data, and carrying out the fast Fourier transform to obtain spectrum distribution data; according to the spectrum distribution data, performing frequency band division to obtain an initial power ratio; performing adaptive filtering according to the initial power ratio and the multi-band signal data to obtain a fundamental wave amplitude fluctuation characteristic; performing wavelet decomposition according to the fundamental wave amplitude fluctuation characteristics to obtain abnormal signal time-frequency energy distribution; performing K-means clustering division according to the abnormal signal time-frequency energy distribution, and matching a harmonic fault database to obtain a fault type identifier; and according to the fault type identifier and the abnormal signal time-frequency energy distribution, ring network topology propagation time delay analysis is carried out, a fault position coordinate is positioned, and a fault diagnosis report is generated. According to the method, the network fault can be accurately diagnosed for multi-band complex signal interference.

The invention provides a diversity communication method and a diversity communication device, which are used for providing a diversity transmission scheme. The first device maps a plurality of modulation symbols corresponding to one transmission block to a plurality of antenna ports; in each mapping, a plurality of consecutive modulation symbols are mapped onto one antenna port. And then, the first equipment maps the modulation symbols on each antenna port to the frequency domain resources corresponding to the antenna ports, and the frequency domain resources corresponding to different antenna ports are not overlapped. Due to the fact that frequency domain resources corresponding to different antenna ports are not overlapped, that is, one transmission block is transmitted on different channels, the transmission block achieves the purpose of diversity transmission. Moreover, when the modulation symbols are mapped to the antenna port, a plurality of continuous modulation symbols are mapped each time, and the mapping mode can keep the phase difference among the plurality of continuous modulation symbols not damaged, so that the communication system can keep a relatively low peak-to-average power ratio (PAPR).

The invention relates to the field of underwater acoustic communication and detection, in particular to a waveform optimization method and system for an underwater acoustic detection and communication integrated system. According to the method, a constant modulus phase is taken as a constraint, a reserved subcarrier phase is taken as an optimization variable, and a multi-objective function for joint optimization of a peak-to-average power ratio and a non-periodic autocorrelation integral sidelobe ratio is constructed; a population is initialized, an objective function is evaluated, and a parent population is obtained through non-dominated sorting and crowding distance calculation; generating filial generations through selection, crossover and variation, combining the filial generations with the parent generations, and updating sorting and crowding distance to maintain population diversity; introducing a local gradient descent refinement mechanism, carrying out gradient iteration adjustment on an optimized individual under a constant modulus phase condition, and adaptively adjusting a crossover probability, a mutation probability and a phase variation scale according to a diversity evaluation result; and outputting a Pareto optimal solution set after the maximum number of iterations is reached, and obtaining an optimized sounding and communication integrated orthogonal frequency division multiplexing signal, so that the underwater communication and detection comprehensive performance can be effectively improved.

The invention relates to the technical field of radio-frequency signal processing, and discloses a 5G radio-frequency signal amplification method and system, and the method comprises the steps: decomposing an obtained radio-frequency signal into a high-frequency sub-band and a low-frequency sub-band through a multilayer wavelet packet, judging whether the radio-frequency signal is sparse in a wavelet packet domain, and carrying out the sparse reconstruction of an LI norm minimization problem if the radio-frequency signal is sparse; obtaining feature data of each sub-band, extracting a nonlinear transfer function of each sub-band through a CNN-GRU network, and carrying out transfer learning pre-training and dynamic adaptation updating; on the basis of dynamic adaptation update ending, layered memory polynomial calculation and layered model joint output construction, layered model parameter optimization is converted into a least square problem to obtain an error compensation function, and resource allocation is dynamically adjusted according to the peak-to-average power ratio of an input signal; and based on power amplifier state data, holographic sensing is performed on nonlinear parameters of the device through a fusion model, and dynamic changes of the device are compensated through multi-stage calibration and calibration delay is controlled.

The invention discloses a current source type LCCL double-frequency resonance system and a parameter matching method thereof, which are suitable for synchronous double-frequency induction quenching of complex workpieces such as gears. The system is composed of two current type resonant inverters working at a low frequency and a high frequency respectively and a dual-frequency LCCL resonant cavity, and dual-frequency current superposition is realized through parallel output. The double-frequency LCCL resonant cavity has two parallel resonance points, a mode based on simplified topology is adopted to simplify parameter design, and meanwhile design errors are maintained at a low level. A power matching coefficient is introduced, the ratio of high-frequency output power to low-frequency output power is adjusted by adjusting the value of the power matching coefficient, and the problem of double-frequency power unbalance caused by frequency variation characteristics of load equivalent resistance and the like is solved. The superposed double-frequency current forms a low-frequency envelope embedded high-frequency oscillation composite waveform on the induction heating coil, cooperative control of tooth root deep quenching (low frequency) and tooth surface hard quenching (high frequency) is achieved, and the method has the advantages of being simple in parameter design, high in power decoupling performance, high in operation stability and the like.

The disclosure deals with system and method for discerning the radius maximizing reliability for binary modulation on conjugate-reciprocal zeros (BMOCZ) implemented with both a maximum likelihood (ML) and direct zero-testing (DiZeT) decoder. The optimal radius for BMOCZ is disclosed to be a function of the employed decoder. The radius maximizing the minimum distance between polynomial zeros does not maximize the minimum distance of the final code. While maximizing zero separation offers an almost optimal solution for the DiZeT decoder, the ML decoder outperforms the DiZeT decoder in both additive white Gaussian noise (AWGN) and fading channels when the radius is chosen to maximize codeword separation. Different sequence-to-subcarrier mappings for BMOCZ-based orthogonal frequency division multiplexing (OFDM) are analyzed to highlight a flexible time-frequency mapping approach that avoids distortion introduced by a frequency-selective channel at the expense of higher peak-to-average power ratio (PAPR).

The invention relates to the technical field of power cable data communication, in particular to a power line carrier communication system peak-to-average power ratio suppression method, which comprises the following steps: carrying out structure definition on modulated frequency domain data at a sending end, constructing a complete spectrum signal, and carrying out copying based on the complete spectrum signal to respectively obtain a processing signal and an original signal; training an LSTM auto-encoder model, and inputting the processing signal to the trained LSTM auto-encoder model to optimize the bit error rate and the peak-to-average ratio loss so as to generate a peak clipping signal; splicing the peak clipping signal with the original signal to form a new sending signal; a transmit signal is converted into a time domain signal based on an inverse fast Fourier transform. The method has the effect of improving the carrier communication quality and communication efficiency of the power line.

The invention provides a method for transmitting a binary data sequence on an OTFS communication channel influenced by Doppler spread. According to the method, the optimization of the pilot signal power ratio can be realized only by using the existing information of the transmitter end, and end-to-end simulation or test is not needed. A corresponding receiver executes two-stage iterative channel estimation, signal detection, demapping and data decoding, and iteratively feeds back information obtained from decoded data to channel estimation, signal detection, demapping and data decoding.

The invention relates to the technical field of optical communication, and discloses a multi-dimensional and multi-phase-based 50G PON signal noise compensation method, which comprises the following steps: S1, generating a mixed signal, including superposing a multi-phase orthogonal pilot signal into a data signal time domain at a transmitting end according to a preset proportion lower than the power of a data signal; and S2, transmitting the mixed signal in a polarization multiplexing mode, wherein the polarization multiplexing adopts double-channel parallel transmission of an X polarization state and a Y polarization state. Multi-phase orthogonal pilot signals are superposed to a data signal time domain in a low-power proportion at a transmitting end, polarization multiplexing dual-channel transmission is adopted, a narrow-band filter is utilized at a receiving end to separate pilots and calculate channel damage parameters, and a finite impulse response filter is configured to perform linear equalization compensation. And the simplified Kalman filtering algorithm is combined to estimate the phase noise and correct the phase, so that collaborative suppression of the linear channel damage and the phase noise in the 50G PON signal is facilitated.

A establishing method of a reconfigurable intelligent surface radio frequency model includes calculating a first power ratio between a first receiving antenna and a first transmitting antenna according to a first wireless transmission equation; calculating a second power ratio between a second receiving antenna and a second transmitting antenna according to a second wireless transmission equation, wherein a reconfigurable intelligent surface is disposed between the second transmitting antenna and the second receiving antenna, and separated from the second transmitting antenna by a reference distance; calculating the first power ratio, the second power ratio and a path loss corresponding to the reference distance to obtain a relay gain of the reconfigurable intelligent surface; and establishing the reconfigurable intelligent surface radio frequency model based on a loss correction value and the relay gain.

Embodiment of the disclosure relate to power splitter comprising a first separation block comprising an input and a first output, the first separation block being configured to receive an input signal via the input and forward the input signal. The power splitter further comprises a second output and a first non-linear impedance connected to the first separation block. The first non-linear impedance is configured to reflect a reflection signal of the input signal to the first output and forward a forward signal of the input signal to the second output, wherein a power ratio between the reflection signal and the forward signal is based on a configuration of the first non-linear impedance.

The embodiment of the invention provides a radio frequency circuit and electronic equipment, and the radio frequency circuit comprises a radio frequency signal link which is connected with an antenna end and is used for transmitting a radio frequency signal of a radio frequency input end to the antenna end or receiving the radio frequency signal from the antenna end; the bi-directional coupler performs forward power detection and reverse power detection on the radio frequency signal on the radio frequency signal link to generate a forward power value and a reverse power value; the VSWR calculation network circuit is used for calculating a ratio between the forward power value and the reverse power value to obtain a power ratio; outputting a protection control signal based on the power ratio and a preset VSWR threshold value; the power limiting network control circuit receives the protection control signal and outputs a pull-down control signal based on the protection control signal; a plurality of power limiting networks, wherein each power limiting network is connected with the radio frequency signal link; and the power limiting networks are used for receiving the corresponding pull-down control signals and carrying out power pull-down on the radio frequency signals in the radio frequency signal link based on the pull-down control signals.

The invention relates to a system and method for frequency domain copy mode transmission using orthogonal codes. A system for providing copy mode orthogonal frequency division multiple access transmission while maintaining a relatively low peak-to-average power ratio is disclosed. Data to be transmitted are converted into symbols, and the symbols are copied to a certain number of resource units. A phase shift is applied to a number of symbols prior to transition to the time domain for transmission. The phase shift may be removed at the receiver prior to decoding the signal into transmitted data.

The invention discloses a satellite communication waveform generation method and system based on coding orthogonal frequency division multiplexing and continuous phase modulation, and a storage medium. The satellite communication waveform generation method comprises the following steps: S1, performing low-density parity check coding on input data; s2, performing constellation mapping on the coded data to generate a symbol sequence; s3, performing multi-stage continuous phase modulation on the symbol sequence to obtain a modulated signal; s4, performing selective mapping processing on the modulated signal, and selecting an orthogonal frequency division multiplexing subcarrier signal with the lowest peak-to-average power ratio as a signal to be output; s5, performing inverse fast Fourier transform on the to-be-output signal, adding a cyclic prefix, and outputting a final signal; the method can suppress the peak-to-average power of the signal, and is high in processing efficiency and low in bit error rate.

The invention provides a communication method and device. The method comprises the following steps: determining a first frequency domain resource position of a primary synchronization signal PSS, a second frequency domain resource position of a secondary synchronization signal SSS, and a third frequency domain resource position of a physical broadcast channel PBCH signal; performing single-carrier modulation on a symbol borne by the PBCH based on the third frequency domain resource position to obtain a PBCH signal, wherein the single-carrier modulation comprises performing the same frequency domain spectrum shaping (FDSS) processing on a common part of the first frequency domain resource position of the PSS, the second frequency domain resource position of the SSS and the third frequency domain resource position of the PBCH signal; according to the method and the device, the synchronization signal block SSB with a relatively low peak to average power ratio (PAPR) can be obtained, and the SSB comprises the PBCH signal modulated by adopting a single carrier, so that the transmitting power of the SSB is improved, and the coverage range of a cell is improved.

Aspects presented herein provide a low PAPR waveform design based on resource spreading, pulse shaping, and / or dynamic MCS configuration, such that a transmitting wireless device may set IBO of its PA closer to the saturation point of the PA to enhance the PA efficiency. In one aspect, a first network node receives waveform information from a second network node, where the waveform information includes at least one of: one or more first parameters associated with a first waveform type or one or more second parameters associated with a second waveform type. The first network node processes data based on the one or more first parameters associated with the first waveform type or the one or more second parameters associated with the second waveform type. The first network node transmits a waveform based on the processed data, where the waveform is the first waveform type or the second waveform type.

Methods, systems, and devices for wireless communications are described. In some examples, a transmitting device (e.g., a base station) may utilize machine learning to modify a signal as conditions of a channel change to reduce a peak to average power (PAPR). For example, a base station may select a type of machine learning. The base station may receive one or more feedback messages related to a condition of a channel and modify a downlink signal based on the selected type of machine learning and the one or more feedback messages. In some cases, the base station may transmit the modified downlink signal to a user equipment (UE) along with information indicating the modified downlink signal and the UE may reconstruct the downlink signal based on the information.

A PAPR optimization method for digital FM radio transmission is disclosed. The method includes generating an Orthogonal Frequency-Division Multiplexed (OFDM) signal for transmission and applying an adaptive PAPR reduction algorithm to the generated signal. The method further includes determining a Modulation Error Ratio (MER) for one or more frequency sidebands and iteratively adjusting PAPR reduction parameters based on the measured MER values. The adjustment includes optimizing the number of PAPR reduction iterations for a highest-power primary digital sideband, optimizing QAM constellation constraint limits, and adjusting convergence bias weight settings for a lowest-power primary digital sideband and / or secondary digital sidebands to maintain target MER values. The method further includes updating PAPR reduction parameters in real-time until the measured MER values meet predefined target thresholds and executing instructions to coordinate the operation of an optimization servomechanism, ensuring dynamic PAPR optimization across multiple transmission modes.

A terminal according to one aspect of the present disclosure includes: a receiving section that receives an indication of transmission of a physical uplink shared channel (PUSCH) using more than four layers; and a control section that determines a transmission power ratio between a phase tracking reference signal (PTRS) and the PUSCH. According to one aspect of the present disclosure, it is possible to appropriately control UL transmission using more than four antenna ports.

This application provides an information transmission method, and an apparatus, to reduce a peak to average power ratio (PAPR). In the method, a first apparatus sends a physical protocol data unit (PPDU) to a second apparatus. The PPDU includes resource unit allocation information, and the resource unit allocation information indicates one or more resource units. The resource unit allocation information further indicates that the one or more resource units include a first subcarrier set and a second subcarrier set, and the first subcarrier set and the second subcarrier set do not overlap. The PPDU includes first data sent on the first subcarrier set and a sequence sent on the second subcarrier set, and the sequence is used to reduce the PAPR. Based on the foregoing solution, the PAPR may be flexibly reduced by changing a value of each second subcarrier included in the second subcarrier set.

The invention discloses a self-adaptive modulation method and device for a power line carrier communication system, which belongs to the technical field of power line carrier communication, and comprises the following steps of: acquiring channel information of the power line carrier communication system, including a transmission characteristic value of each sub-channel and the total transmitting power of the system, and calculating the signal-to-noise ratio of each sub-channel; according to the signal-to-noise ratio of each sub-channel and the total transmission power of the system, calculating the power value allocated to each sub-channel, adjusting the original power peak-to-average ratio of the sub-channel, determining the adjusted power peak-to-average ratio, and calculating the adjusted coding gain through an optimization coefficient related to the system characteristics in combination with the adjusted power peak-to-average ratio and the original coding gain; according to the method, the performance and the reliability of the power line carrier communication system are improved by reasonably distributing the sub-channel power, controlling the peak-to-average power ratio, optimizing the error control coding gain and intelligently switching the working mode.

The invention provides a gain control method, a storage medium and a radio frequency generator, and the method is applied to the technical field of radio frequency, and comprises the steps: determining a target analog gain control parameter and a target digital gain control parameter according to a target power proportion in a radio frequency output instruction when the radio frequency output instruction is received; and performing digital domain gain modulation based on the target digital gain control parameter and a radio frequency signal parameter in the radio frequency output instruction to obtain a digital radio frequency waveform, converting the digital radio frequency waveform into an analog radio frequency waveform, and performing analog domain gain modulation on the analog radio frequency waveform based on the target analog gain control parameter to obtain a target radio frequency signal.

This invention provides an OTFS peak-to-average power ratio (PAPR) suppression method, apparatus, electronic device, and readable storage medium for high-reliability transmission, applied in the field of wireless communication technology. The method includes: embedding a pilot signal into an OTFS delay-Doppler domain signal frame and setting a guard interval to obtain an initial delay-Doppler domain transmitted signal; performing amplitude-limiting filtering on the transmitted signal to obtain amplitude-limited filtered noise; obtaining approximately iteratively ...

The invention discloses a radar communication integrated waveform design method based on an OFDM (Orthogonal Frequency Division Multiplexing) signal. The method comprises the following steps that: a transmitting end completes constellation mapping on transmitted communication information, performs ZCT matrix reconstruction, performs serial-parallel conversion on reconstructed communication data, performs spectrum shaping on an integrated signal by adopting an improved Nyquist pulse, and transmits the integrated signal to a receiving end; and then IFFT processing, parallel-to-serial conversion, cyclic prefix addition, digital-to-analog conversion and up-conversion are carried out on the shaped data, and finally integrated waveform emission is completed. And the receiving end performs down-conversion, analog-to-digital conversion and cyclic prefix removal operation on the received signal. In the communication function, serial-to-parallel conversion, FFT processing, inverse pulse shaping, parallel-to-serial conversion, ZC matrix reconstruction solution and inverse mapping are carried out on the data without the cyclic prefix to obtain communication information. In the radar detection function, radar signal processing is performed on data without cyclic prefixes. According to the method, the correlation of OFDM integrated signals can be effectively optimized, the modulation characteristic of communication information is improved, the influence of the communication information on a fuzzy function is reduced, OFDM symbols have better correlation, meanwhile, the peak-to-average power ratio of the system is effectively reduced through pulse shaping, implementation is easy, and the comprehensive performance of the system can be remarkably improved.

Embodiments of this application provide a method and an apparatus for transmitting a physical layer protocol data unit. The short training field sequence designed in this application has a smaller peak-to-average power ratio PAPR and better performance. The method includes: generating a physical layer protocol data unit PPDU that complies with the 802.11be standard, where the PPDU includes a short training field, and a quantity of subcarriers of a frequency domain sequence of the short training field is greater than 2048; and sending the PPDU on a target channel, where a bandwidth of the target channel is greater than or equal to 160 MHz.

The invention provides an antenna assembly and electronic equipment, the antenna assembly comprises an antenna array and a waveguide cavity, the antenna array comprises N groups of antenna units, N-1 levels of power dividers and a signal source; the first output end of the mth-level power divider is connected to the input end of the mth group of antenna units, the second output end of the mth-level power divider is connected to the input end of the (m + 1) th-level power divider, the first output end of the (N-1) th-level power divider is connected to the input end of the (N-1) th group of antenna units, and the second output end of the (N-1) th-level power divider is connected to the input end of the Nth group of antenna units; the power dividers of the antenna array are all located in the waveguide cavity, so that wires between the signal sources and the antenna units are configured to be similar to coaxial suspended strip lines. The number of the antenna units connected with the two output ends of the power divider is different, the power divider is designed in a manner that the number of the units is not equal, the power ratio of the power divider is reduced, low-amplitude-lobe suppression amplitude distribution is convenient to process and design, and low-amplitude-lobe suppression is achieved.

The invention relates to the field of network communication, in particular to a sensing information acquisition method and device, computer equipment and a storage medium, which can freely set and control the transmitting power and the peak-to-average power ratio under the condition of ensuring the performance of radar and communication, obtain a communication sensing integrated signal and improve the communication sensing efficiency. According to the invention, efficient sharing of frequency spectrum sub-band resources and transmitting power is realized, the utilization rate of the frequency spectrum resources is maximized, the negative influence of radio frequency circuit transmitting signal distortion caused by the fact that echo signal noise power may be greater than echo power is reduced as much as possible, and the requirement of information perception in a longer distance is met.

The present invention discloses a low-complexity peak-to-average power ratio (PAPR) suppression method for multi-carrier modulation signals based on ADMM, belonging to the field of wireless communication. The method includes: introducing phase shifts to each sub-carrier in the signal transmission frequency domain of the multi-carrier modulation system; obtaining the time-domain waveform through oversampling and mathematically modeling the PAPR to obtain an optimization problem; in the Lagrangian function of the optimization problem, fixing the phase factor and the Lagrange multiplier, and then optimizing the optimization objective; fixing the optimization objective and the Lagrange multiplier of this optimization problem and using the fast Fourier transform (FFT) to optimize the phase factor; updating the Lagrange multiplier according to the optimized optimization objective, phase factor and constraint conditions, and iterating repeatedly until convergence, and optimizing the PAPR of the multi-carrier modulation through the optimized phase factor. The PAPR suppression method of the present invention has good PAPR optimization effect and low computational complexity.

The invention discloses a channel estimation method of a time-varying channel in a time delay-Doppler domain pilot mode, which comprises the following steps of: superimposing a hybrid superimposed pilot and a data symbol in a time delay-Doppler domain, the pilot comprising a high-power center pilot and a low-power edge pilot; the signal is converted to a time domain through inverse symplectic Fourier transform and Hisenberg transform; a receiving end obtains a receiving signal through Wigner transform and Sextile Fourier transform; estimating integer time delay and Doppler taps by using a center pilot frequency, and constructing a sparse channel matrix; estimating fractional Doppler and channel gain through a sparse Bayesian learning algorithm; and detecting a data symbol based on a minimum root-mean-square error algorithm, and realizing accurate estimation of channel parameters through iterative interference elimination. According to the method, the peak-to-average power ratio and the algorithm complexity can be effectively reduced, and non-correlation channel components and cross interference are inhibited.