17 results about "Small peak" patented technology

The invention discloses a high-power microwave amplitude limiting circuit which has a three-stage structure, a first-stage circuit and a second-stage circuit are respectively composed of three Schottky diodes at the upper part and three Schottky diodes at the lower part, and a third-stage circuit is respectively composed of three PIN diodes at the upper part and three PIN diodes at the lower part and is symmetrically distributed. Each stage of circuit is connected by a quarter-wavelength impedance transmission line, and two ends of the circuit are connected in series with a capacitor. After a radio-frequency signal is input from the first port, the Schottky diodes are rapidly conducted and generate direct current, the direct current can provide forward bias for the PIN diodes which are reversely connected in parallel after passing through the Schottky diodes of the first two stages, the bias current can rapidly reduce the forward conduction resistance of the PIN diodes, the PIN diodes are made to be in an approximate short-circuit state, and therefore the positive conduction resistance of the PIN diodes is reduced. The current is output from the third stage, and at the moment, the circuit can reflect most incident power so as to achieve the purpose of amplitude limiting. The invention overcomes the defects of difficult circuit structure adjustment, poor performance and the like, and has the advantages of low power consumption, large power capacity, small peak leakage energy, small response time and the like.

To provide a peak hold device which can acquire an arbitrary peak value of an attenuation vibration waveform.SOLUTION: A peak hold device 100 starts holding the value of an attenuation vibration waveform at a time before a target peak which is one of the largest peak and the smallest peak of a target of which peak value is to be acquired and repeats processing of stopping holding the value of the attenuation vibration waveform at a time after the target peak for a plurality of attenuation vibration waveforms.SELECTED DRAWING: Figure 1

The application provides a signal peak-to-average ratio suppression method and system, an electronic device and a storage medium. The peak-to-average ratios of transmission sequences corresponding to two factor sequences before and after flipping of a phase rotation factor of each signal block are sequentially compared, the phase rotation factor with a smaller peak-to-average ratio of the signal block is determined, and the phase rotation factor with a larger peak-to-average ratio of the signal block is no longer considered in the comparison process of subsequent signal blocks. Thus, the number of peak-to-average ratio calculations and comparisons is reduced, and the calculation complexity and calculation time are greatly reduced while ensuring a certain peak-to-average ratio suppression effect.

The present application is suitable for wideband digital communication technology field, and relates to a fast search method of optimal time domain candidate signal of partial transmission sequence algorithm, which is characterized by the following steps: through equivalent exchange of calculation and selection process of time domain candidate signal of PTS scheme, the calculation and selection process of scrambling signal of time domain signal corresponding to original frequency domain signal is converted; and through setting of peak value threshold, fast screening of scrambling signal is realized; through calculation and comparison of a small proportion of local values, time domain candidate signal with minimum or smaller peak average ratio value is quickly found, calculation proportion of element value of candidate signal is greatly reduced, thereby calculation complexity of algorithm is effectively reduced, and peak average ratio value efficiency is 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 present application discloses an FBMC‑OQAM passband underwater acoustic communication system for realizing peak-to-average ratio suppression, and relates to the field of FBMC‑OQAM passband underwater acoustic communication systems. The system adds a compression and expansion processing module to a transmitting link, and adds a de-spreading processing module to a receiving link. The Laplace distribution function is used to fit the signal amplitude according to the data characteristics of the passband transmission signal, and then the expression of the peak-to-average ratio of the passband transmission signal after compression and expansion is constructed in combination with the function of the compression and expansion function. Then, the compression and expansion function with known compression and expansion parameters can be used so that the compression and expansion processing module compresses and expands the passband transmission signal according to the compression and expansion function to obtain a compressed passband transmission signal with a smaller peak-to-average ratio, and then sends it, and performs inverse processing and de-spreading at the receiving end. The system can realize FBMC‑OQAM peak-to-average ratio suppression, which is beneficial to improving the transmission distance.

The present invention relates to the field of power transmission line protection technology, and specifically to a fusion ranging method based on multi-band identification, including: obtaining three-phase voltage and current values ​​at the protection installation; determining the power frequency fault point location using the power frequency impedance method; calculating the line mode high and low frequency components of the current traveling wave and the line mode low frequency components of the voltage traveling wave; finding the peak values ​​of the current line mode high frequency components of the protection on both sides, and detecting whether there are other peak values ​​greater than the threshold to the forward patrol point; comparing the peak values ​​corresponding to the initial traveling wave sampling point numbers of the protection on both sides, and detecting the initial traveling wave on the side with a smaller peak value within the setting time window corresponding to the power frequency fault point location; verifying the validity of the initial traveling wave according to the polarity criterion and the peak-to-peak ratio criterion; determining the fault location according to the initial traveling wave sampling point number of the bilateral protection. The present invention combines a variety of abnormal wave detection methods to effectively improve the reliability of traveling wave ranging.

Embodiments of the present disclosure relate to a method, medium and device for reducing a peak-to-average ratio of an orthogonal frequency division multiplexing system. The method comprises: receiving original data of a signal to be transmitted; generating a first carrier signal of the orthogonal frequency division multiplexing system according to the original data; generating a plurality of mutually independent second carrier signals through a generative adversarial network according to the first carrier signal; calculating peak-to-average ratios of the plurality of mutually independent second carrier signals, and selecting a second carrier signal with the smallest peak-to-average ratio for transmission; wherein the first carrier signal and the second carrier signal both carry information of the original data. The present disclosure generates a plurality of carrier signals with the same information through a generative adversarial network for calculation and comparison of peak-to-average ratios, selects a second carrier signal with the smallest peak-to-average ratio for transmission, and thus reduces the peak-to-average ratio. Since point multiplication of a frequency domain signal and a phase rotation factor and large-scale inverse fast Fourier transform operations are not required, the computational complexity is greatly reduced.

A sequence-based signal processing method and apparatus are provided. A sequence meeting a requirement for sending a signal by using a physical uplink control channel (PUCCH) is determined, where the sequence is a sequence {fn} consisting of N elements, fn is an element in the sequence {fn}, and the determined sequence {fn} is a sequence meeting a preset condition; then, the N elements in the sequence {fn} are respectively mapped to N subcarriers to generate a first signal; and the first signal is sent. By using the determined sequence, when a signal is sent by using a PUCCH, a low sequence correlation can be maintained, and a relatively small peak-to-average power ratio (PAPR) value and cubic metric (CM) value can also be maintained, thereby meeting a requirement of a communication application environment in which a signal is sent by using a PUCCH.

Embodiments of this application provide a method and an apparatus for transmitting a physical layer protocol data unit, to design a short training field sequence for a larger channel bandwidth. 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.

A method performed by a receiver for Line-of-sight, LoS, path detection in a reception of a signal from a transmitter, the method comprising obtaining an antenna gain of the transmitter and determining an amplitude threshold (62) and / or a time threshold (63) to be used for the LoS path detection at least according to the obtained antenna gain. The method comprises detecting whether at least one smaller peak (6b) appears earlier than a max peak (6a) of a cross-correlated time domain series of the received signal that applies to the determined threshold(s) (62, 63). The at least one smaller peak (6b) is considered to apply to the determined threshold(s) if the at least one smaller peak (6b) is above the amplitude threshold (62) and / or after the time threshold (63). A peak from the detected peak(s) is determined as associated with the LoS path. Publ.

The invention relates to a dynamic multi-constraint self-adaptive wave crest and wave trough coupling edge finding positioning method and device and a medium, and the method comprises the steps: obtaining edge finding data, and forming a storage queue; when the queue stores the double-line waveform data with the preset capacity, dividing sections, executing extreme value search on each section to determine a wave crest, traversing a transition region between adjacent wave crest pairs, and searching an absolute minimum amplitude point as a wave trough reference point; checking whether the distance between the adjacent wave crest pairs falls into the relevance tolerance interval or not in parallel, and whether the wave trough reference point meets the product constraint of a smaller peak value in the wave crest pairs and a preset comparison coefficient or not; if the verified wave crest pair exists, selecting the position of a single wave trough reference point or the central position of a multi-wave trough reference point as a wave trough detection point; and outputting a positioning control instruction based on the trough detection point and the crest interval. According to the method, a closed-loop control mechanism with dynamic feedback and multi-dimensional feature fusion is constructed, so that the robustness and environmental adaptability of edge finding detection under complex working conditions are improved.

A sequence-based signal processing method and apparatus are provided. A sequence meeting a requirement for sending a signal by using a physical uplink control channel (PUCCH) is determined. The sequence is a sequence {fn} consisting of 12 elements, fn represents an element in the sequence {fn}, and the determined sequence {fn} is a sequence meeting a preset condition. Then, the 12 elements in the sequence {fn} are respectively mapped to 12 subcarriers, to generate a first signal, and the first signal is sent. By using the determined sequence, when the signal is sent by using the PUCCH, a low correlation between sequences can be maintained, and a relatively small peak-to-average power ratio (PAPR) value and a relatively small cubic metric (CM) value can be maintained. Therefore, a requirement of a communication application environment in which the signal is sent by using the PUCCH is met.

Method for determining a distance between two units (1,2), wherein the method comprises: Executing a double-sided two-way distance measurement protocol (S200), wherein the latter causes the two units (1,2) to send and receive signals, each of the signals being a composite tone generated as a composition of two waveforms separated in time by a gap such that the composition forms a bipolar waveform, wherein: the two units (1,2) comprise a first unit and a second unit; the sent and received signals comprise a first signal and a second signal; and The execution of the double-sided two-way distance measurement protocol (S200) causes the first unit to perform a group of steps comprising: Sending the first signal to the second unit at a first time; Receiving the second signal, which was sent by the second unit after receiving the first signal, at a second time, and Correlating an expected signal with a first comparison element, the latter being obtained on the basis of the received second signal, to determine a first time interval between the first time and the second time and accordingly derive the distance between the two units (1,2), where the first unit further includes the following group of steps: Triggering an audio recording prior to the transmission of the first signal, wherein the first comparison element is obtained by recording both the transmitted first signal and the received second signal; and Correlating a representation of the first signal with the first comparison element to determine the first time point, wherein the expected signal is correlated with the first comparison element to determine the second time point, wherein the first unit determines the first time interval as a difference between the determined second time point and the determined first time point; wherein the representation of the first signal and the expected signal are correlated with the first comparison element to obtain corresponding cross-correlation signals, each exhibiting a triple-peak pattern showing two smaller peaks separated by a larger peak.

A sequence-based signal processing method and apparatus are provided. A sequence meeting a requirement for sending a signal by using a physical uplink control channel (PUCCH) is determined, where the sequence is a sequence {fn} consisting of N elements, fn is an element in the sequence {fn}, and the determined sequence {fn} is a sequence meeting a preset condition; then, the N elements in the sequence {fn} are respectively mapped to N subcarriers to generate a first signal; and the first signal is sent. By using the determined sequence, when a signal is sent by using a PUCCH, a low sequence correlation can be maintained, and a relatively small peak-to-average power ratio (PAPR) value and cubic metric (CM) value can also be maintained, thereby meeting a requirement of a communication application environment in which a signal is sent by using a PUCCH.

To easily correct the position of leads in semiconductor devices. [Solution] In the photoelectron spectrum on the Si side (center), there is no significant difference for (5) to (8), which correspond to a region deeper than the center of the Ni silicide layer. However, in (1) to (4), which are shallower and within 50 nm from the surface, in Example (b), the Ni in the photoelectron spectrum... x In comparative example (a), a region of localized high intensity (small peak) is observed at higher energies than the main peak corresponding to Si, whereas these small peaks are not visible in comparative example (a). The energy in this region corresponds to SiO2 and SiO2. x This corresponds to (x<2). In other words, in Example (b), silicon oxide is formed at these depths, whereas in Comparative Example (a), such silicon oxide is not formed.

The invention relates to the technical field of radar signal optimization, and discloses a low-peak sidelobe level sparse array optimization method in a constraint direction angle range, which comprises the following steps: traversing an initial array, corroding array elements except two ends in the initial array one by one to obtain a plurality of intermediate arrays, and setting the intermediate arrays as original intermediate arrays; judging whether the number of array elements of each original middle array is greater than a set threshold value, if so, selecting a plurality of arrays with minimum peak side lobes within a constraint direction angle range from the plurality of original middle arrays as new middle arrays, and then traversing the new intermediate array and corroding the array elements except for the two ends in the new intermediate array one by one to obtain a plurality of arrays, enabling the obtained arrays to be the original intermediate array, and then returning to the step, otherwise, selecting the new intermediate array with the minimum constraint direction angle peak side lobe as the optimal sparse array. According to the method, the optimal sparse array distribution with low PSL in a certain direction angle range can be quickly found.