224 results about "Power ratio" patented technology

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 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).

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.

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.

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 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 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.

The embodiment of the invention provides an RIS cascade channel model simplification method and device based on cluster deletion, and relates to the technical field of wireless communication. The method comprises the following steps: generating a first multipath of a first channel from a transmitting end to a reconfigurable smart surface (Tx-RIS), and generating a second multipath of a second channel from the RIS to a receiving end (RIS-Rx); performing power normalization and arrangement processing on the first multipath and the second multipath respectively; respectively carrying out convolution operation on the first multipath and the second multipath according to the sorting sequence, and determining reserved multipath combination information; calculating RIS electromagnetic response according to the multipath combination information; and generating a channel impulse response of Tx-RIS-Rx according to the RIS electromagnetic response. According to the scheme provided by the invention, the cluster or multipath component with low power ratio is removed from the Tx-RIS and RIS-Rx sub-channels, so that the modeling complexity is effectively reduced and the modeling efficiency is improved on the premise of ensuring the statistical channel characteristics.

The invention relates to a method for reducing the peak-to-average power ratio of an OFDM-type signal comprising N subcarriers. The signal results from stacking M spatial components that are each transmitted by a respective antenna of a radiofrequency transmitter to a plurality of receivers. Such a method uses spatial coding of the distortion signal associated with clipping the OFDM signal transmitted by the transmitter so that the distortion signal in question is transmitted in the direction of a receiver for which the estimated propagation channel, between the receiver in question and the transmitter, corresponds to a path loss greater than a predetermined threshold.

The present invention provides an OFDM signal processing method, transmission system, and device for effectively reducing the peak-to-average power ratio of an OFDM signal, which includes: determining a frequency of an OFDM modulation symbol obtained by digitally modulating an OFDM signal; determining a frequency domain function value corresponding to the frequency of the OFDM modulation symbol based on a frequency domain function and the frequency of the OFDM modulation symbol, where the frequency domain function is obtained by linearly combining a first-order linear function and a trigonometric function of a different frequency; determining a coding matrix corresponding to the OFDM signal according to the frequency domain function value corresponding to the OFDM modulation symbol; and processing the OFDM signal using the coding matrix corresponding to the OFDM signal to obtain a target OFDM signal according to a variation rule of the frequency domain function.

Certain aspects of the present disclosure provide techniques for peak to average power ratio (PAPR) reduction for orthogonal frequency division multiplexing (OFDM). An example method, performed at a transmitter, includes generating a plurality of orthogonal frequency division multiplexed (OFDM) symbols, based on a constellation associated with a modulation scheme, adjusting a phase of at least one of the OFDM symbols based on at least one parameter that depends on a non-integer multiple of a phase distance between two points on the constellation, generating a Discrete Fourier Transform spread OFDM (DFT-s-OFDM) waveform based on the OFDM symbols after the adjustment, and transmitting the DFT-s-OFDM waveform to a receiver.

This disclosure provides systems, apparatus, apparatuses, and methods, including computer programs encoded on a storage medium, for a beam combining codebook based on low PAPR waveforms. The UE (102) receives (304), from the network entity (104), a configuration of a codebook comprising a precoder for a beam. The precoder is associated with a plurality of antenna ports, wherein each antenna port of the plurality of antenna ports is mapped to no more than one layer. The UE (102) receives (308) a CSI-RS from the network entity (104) on the CMR configured for the beam, and sends (310) a CSI report to the network entity (104) based on the configuration and the CSI-RS.

A method for adjusting a transmitting (TX) power ratio of a radio module includes: separating multiple radio modules into multiple radio groups according to a radiofrequency (RF) regulation, wherein the multiple radio modules comprise the radio module; mapping an RF exposure limit to a TX power limit; interacting with at least one other radio module for adjusting the TX power ratio, to obtain at least one adjusted TX power ratio, wherein the radio module and the at least one other radio module are comprised in a same radio group of the multiple radio groups; and adjusting the TX power limit according to the at least one adjusted TX power ratio, to generate an adjusted TX power limit of the radio module.

A reception-side apparatus includes: M receive antennas; and a processor configured to execute a first process of acquiring a first signal received from a first transmission-side apparatus from among signals simultaneously received from the N transmission-side apparatuses by receive diversity processing, and acquiring first data by demodulating and decoding the first signal. In the case of N>M, the processor acquires, for each of all patterns of a combination of a first signal, second signals from M−1 transmission-side apparatuses which are to be cancelled by receive diversity processing and third signals from N−M transmission-side apparatuses which are not to be cancelled by the receive diversity processing, a power ratio of power of the first signal relative to total power of the second and third signals based on a predetermined weight and a channel estimate of each signal, and selects a combination with the largest power ratio from among all the patterns.

The application relates to the technical field of relay protection, in particular to a fault type identification method and a computer system for a highland mountain power transmission line. A two-stage aggregation strategy is used to extract a fault event section from a denoised fault current signal, fault component currents are extracted for each fault event section, and average power ratios of fault duration stages and decay stages are calculated. The average power ratios are compared with a discrimination threshold value to determine the fault type, and reliable fault type identification under the highland mountain power transmission line is realized. The application aims to solve the problem of how to realize reliable lightning stroke identification in the special environment of highlands and mountains.

The present application relates to the field of optical communication technology, in particular to a dynamic correction method of an adaptive polarization beam combination chip applied to an optical interconnection interface, comprising the following steps: S101, acquiring the group velocities of optical signals of a first optical path and a second optical path respectively, and transmitting the optical signal with a larger group velocity to a first time delay optical path for time compensation; S102, the time delay compensated optical signal enters a first power reconstruction optical path and a second power reconstruction optical path for power adjustment; S103, the power reconstructed optical signal enters a first phase matching optical path and a second phase matching optical path for phase modulation; S104, a chip monitoring end feeds back the integrated error of the time delay, power and phase of the optical signal, and if the integrated error is greater than a set error threshold, the method returns to step S101 for re-correction. The method compensates or modulates the time delay, power ratio and phase difference, realizes high synchronization and matching of two polarization lights, and thus improves the polarization multiplexing efficiency and signal quality of the whole system.

A transmitter node is disclosed for reducing Peak to Average Power Ratio, PAPR. The transmitter node comprises circuitry configured to cause the transmitter node to transmit, to a receiver node, data in OFDM symbols. For one OFDM symbol, a real part of a first data symbol transmitted on a first subcarrier and an imaginary part of a second data symbol transmitted on a second subcarrier, different from the first subcarrier, are reserved for transmission of a PAPR reducing signal. Resource locations of the first data symbol and of the second data symbol are determined based on preconfigured reservation rules.

Methods, systems, and devices for wireless communications are described. A transmitting device (e.g., a user equipment (UE) or base station) may reduce a peak to average power ratio (PAPR) by clipping signals transmitted to a receiving device according to a clipping level. The receiving device may receive, from the transmitting device, an indication of the clipping level associated with a reference signal. The receiving device may receive the reference signal and identify distortions based on the clipping level. The receiving device may iteratively reconstruct peaks of the clipped reference signal until the receiving device is able to obtain accurate pilot symbols for use in channel estimation. The techniques described herein may enable receiving devices to improve efficiency and reliability of communications by improving channel estimation, which may increase the probability of successfully decoding transmitted information.

An access point may include a processing device configured to: identify a puncturing pattern for a channel width of a physical layer protocol data unit (PPDU) of a transmit signal; compute one or more tone rotation patterns using one or more tone rotation pattern parameters; and select a tone rotation pattern of the one or more tone rotation patterns based on the puncturing pattern for the channel width to minimize a peak to average power ratio (PAPR) of the transmit signal. The access point may include a transceiver configured to transmit the transmit signal to a wireless device based on the tone rotation pattern.

A communication method and apparatus are disclosed, wherein the power ratio of a first data signal is 0 in a portion of a first resource unit. This ensures that the estimation of a first reference signal in the first resource unit is not interfered with by the first data signal, and the resulting first reference signal can better characterize channel characteristics, thereby improving channel estimation performance. Furthermore, in scenarios where channel estimation is performed using a model, a coarse channel estimate can be completed based on the first signal transmitted in the first resource unit. This estimate provides relatively accurate channel amplitude information, and using this estimate as input to the model can further improve channel estimation performance.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may perform a crest factor reduction on a radio frequency (RF) waveform in multiple passes, wherein the multiple passes each include: a clipping operation to reduce a peak-to-average power ratio (PAPR) associated with the RF waveform according to a threshold; and a filtering operation to remove at least a portion of out-of-band emission from the clipped RF waveform. The UE may transmit the RF waveform over a wireless channel, wherein the RF waveform transmitted over the wireless channel satisfies a spectral mask. Numerous other aspects are described.

In modern communication systems, the Peak-to-Average Power Ratio (PAPR) is a critical parameter that significantly impacts the efficiency and performance of signal transmission. High PAPR signals can lead to increased power consumption, reduced battery life in mobile devices, and the need for more expensive and complex power amplifiers, which must operate in a highly linear region to avoid distortion. This exacerbates power inefficiency and increases operational costs. To address these challenges, generating low PAPR waveforms has become a crucial objective. Low PAPR signals help reduce the power amplifier's linearity requirements, thereby enhancing power efficiency and extending the battery life of mobile devices. Additionally, they minimize signal distortion and improve overall system performance, making communication more reliable and cost-effective. Our proposed solution involves selecting a scrambling mask that results in the lowest PAPR waveform from a set of N masks. This scrambling can be applied to different parts of the signal, such as payload bits, CRC bits, encoded bits, or modulated symbols. By optimizing the waveform characteristics through this method, we can achieve significant improvements in power efficiency and signal quality. Furthermore, we have developed various methods for indicating the scrambling mask ID used in the low PAPR waveform generation. These methods include adding additional bits to the payload, blind de-scrambling by the user equipment (UE), using mapping rules of PSS / SSS sequences, adding additional reference signals, or indicating through DCI / UCI. These indication methods ensure flexibility and compatibility across different communication scenarios, making our solution adaptable and effective in diverse environments.

An embodiment provides a method comprising: generating a digital-form time-domain signal; carrying out a modulo-based operation to an amplitude of the generated digital-form time-domain signal or to in-phase and quadrature branches of the generated digital-form time-domain signal separately, wherein a divisor of the modulo-based operation has a pre-defined value smaller than a maximum of an amplitude of the digital-form time-domain signal for limiting a peak-to-average ratio of the digital-form time-domain signal, and carrying out digital-to-analogue conversion to the digital form time-domain signal for transmission.

The embodiment of the application discloses a method for reducing peak-to-average power ratio (PAPR) and a communication device, which are applied to a transmitting system with a power amplifier. In the method, the reserved resource can be determined based on the first unscheduled resource located in the transmission bandwidth and / or the second unscheduled resource located in the guard bandwidth, without using the fixed reserved resource in the traditional technology, so that the flexibility of determining the reserved resource is improved, and the flexibility of reducing the peak-to-average power ratio (PAPR) by using the frequency domain resource reservation (TR) is improved.

A first communication device (e.g., a transmitter) configured to communicate with a second communication device (e.g., a receiver), the first communication device comprising circuitry configured to: transmit a first training field, the first training field comprising a channel estimation sequence for use by the second communication device to estimate a channel between the first communication device and the second communication device; transmitting a second training field, the second training field comprising a non-linear estimation sequence for a second communication device to estimate non-linearity between the first communication device and the second communication device, the second training field having a higher peak-to-average power ratio and / or a different average power than the first training field; receiving non-linear feedback regarding the estimated non-linearity from the second communication device; and configuring subsequent transmissions using the received non-linear feedback.

The present application provides a communication method and a communication apparatus, which can mitigate the problem of signal nonlinear distortion, thereby improving the signal coverage and signal-to-noise ratio, and can be applied to communication systems. The method comprises: a first device acquires a first signal, wherein the first signal is generated at least on the basis of a second signal and a first model, and the first signal at least satisfies one of the following conditions: being used for reducing a peak-to-average power ratio, or the peak-to-average power ratio of the first signal and the second signal being less than the peak-to-average power ratio of the second signal; and the first device sends the first signal and the second signal.

The invention provides a slope power division directional coupler which comprises a first input port, a second input port, a first output port and a second output port, the first input port is connected with the first output port through a first strip line, the second input port is connected with the second output port through a second strip line, and the first output port is connected with the second output port through a second strip line. Parallel coupling lines are configured on the first strip line and the second strip line, the coupling gaps of the coupling lines of the slope power division directional coupler adopt waveform function curves to replace linear gaps, the working frequency band can be broadened, the standing-wave ratio can be effectively reduced, the isolation degree of the directional coupler of an antenna can be greatly improved, and the antenna performance can be improved. And the high-isolation communication requirement is met. Meanwhile, the power ratio of the two output ports of the slope power division directional coupler has a large slope, the power ratio changes greatly along with the frequency, the horizontal wave width of the antenna can be converged, and the coverage energy efficiency of the antenna is improved.

The application provides a method and device for designing a short training sequence. The method comprises: determining a short training sequence, wherein the short training sequence can be obtained based on an existing sequence, and a short training sequence with better performance can be obtained through simulation calculation, for example, adjusting parameters; and transmitting a short training field on a target channel, wherein the short training field is obtained by performing an inverse fast Fourier transform (IFFT) on the short training sequence, and the bandwidth of the target channel is greater than 160 MHz. According to the embodiment of the application, not only can the larger channel bandwidth in practice be met, but also backward compatibility is achieved. Moreover, the short training sequence provided by the embodiment of the application is verified through exhaustive simulation of parameters, the peak-to-average power ratio (PAPR) is small, the performance is better, and thus the estimation effect of the automatic gain control circuit at the receiving end is improved, so that the receiving error rate is reduced.

The invention relates to the technical field of power equipment on-line monitoring and fault diagnosis, and discloses a GIL temperature distribution detection device based on double optical comb coding BOTDA, which comprises a GIL temperature sensing optical fiber, a double optical comb signal generation assembly, an optical transmission and detection assembly and an intelligent control and calculation system. The sensing optical fiber is attached to the surface of the GIL through a suspension type loose tube structure, and stress cross sensitivity is eliminated. The double-optical-comb assembly generates a pumping and detection optical comb loaded with random phase codes, and the peak-to-average power ratio is reduced to suppress modulation instability. The transmission assembly is matched with distributed Raman amplification to realize long-distance bidirectional injection, and optical downsampling is realized by using an optical comb beat frequency effect. And the control system executes closed-loop gain adjustment according to a comparison result of the detection power and a nonlinear threshold value, and calculates the temperature through space-time mapping. According to the invention, the contradiction between the signal-to-noise ratio and the nonlinear effect in long-distance sensing is solved, and high-precision and rapid GIL whole-line temperature monitoring is realized.