30 results about "Extended phase" patented technology

A method of transmitting data using a generalized phase shift based proceding or an extended phase shift precoding scheme in a multiple-antenna system using a plurality of subcarrier and a transceiver for supporting the same are disclosed. A phase shift based precoding matrix may be generalized and determined by a product of a diagonal matrix for phase shift and a unitary matrix for maintaining orthogonality in spatial domain. The diagonal matrix may be extended by a product of a proceding matrix for increasing channel power and the diagonal matrix for phase shift. The design of the transceiver can be simplified or communication efficiency can be improved by generalizing and extending the phase shift based proceding.

A method of transmitting data using a generalized phase shift based precoding or an extended phase shift precoding scheme in a multiple-antenna system using a plurality of subcarrier and a transceiver for supporting the same are disclosed. A phase shift based precoding matrix may be generalized and determined by a product of a diagonal matrix for phase shift and a unitary matrix for maintaining orthogonality in spatial domain. The diagonal matrix may be extended by a product of a precoding matrix for increasing channel power and the diagonal matrix for phase shift. The design of the transceiver can be simplified or communication efficiency can be improved by generalizing and extending the phase shift based precoding.

Methods, apparatuses, systems, and software for extended phase correction in phase sensitive Magnetic Resonance Imaging. A magnetic resonance image or images may be loaded into a memory. Two vector images A and B associated with the loaded image or images may be calculated either explicitly or implicitly so that a vector orientation by one of the two vector images at a pixel is substantially determined by a background or error phase at the pixel, and the vector orientation at the pixel by the other vector image is substantially different from that determined by the background or error phase at the pixel. A sequenced region growing phase correction algorithm may be applied to the vector images A and B to construct a new vector image V so that a vector orientation of V at each pixel is substantially determined by the background or error phase at the pixel. A phase corrected magnetic resonance image or images may be generated using the vector image V, and the phase corrected magnetic resonance image or images may be displayed or archived.

A system and method for processing highly undersampled multi-echo spin-echo data by linearizing the slice-resolved extended phase graph model generates highly accurate T2 maps with indirect echo compensation. Principal components are used to linearize the signal model to estimate the T2 decay curves which can be fitted to the slice-resolved model for T2 estimation. In another example of image processing for highly undersampled data, a joint bi-exponential fitting process can compensate for image variations within a voxel and thus provide partial voxel compensation to produce more accurate T2 maps.

One embodiment of the present invention relates to a phase alignment system including a plurality of samplers, a clock distributor, a phase detector and a phase alignment control. The samplers are configured to receive an incoming signal and a phase adjusted clock signal and to provide samples according to the incoming signal. The clock distributor receives a clock adjustment signal and generates the phase adjusted clock signal, which triggers sampling of the incoming signal. The clock adjustment signal indicates a direction of phase adjustment and can include an amount of phase adjustment. The phase detector receives the samples and provides extended phase alignment commands derived from the samples. The phase alignment control receives the extended phase alignment commands and provides the clock adjustment signal to the clock distributor.

A method for performing a precoding based on a generalized phase shift or a precoding based on an extended phase shift in a Multi-Input Multi-Output (MIMO) system employing several sub-carriers, and a transceiver for supporting the same are disclosed. A phase-shift-based precoding matrix is generalized by multiplying a diagonal matrix for a phase shift by a unitary matrix for maintaining orthogonality between sub-carriers. In this case, a diagonal matrix part may be extended by multiplying a precoding matrix for removing an interference between sub-carriers by a diagonal matrix for a phase shift. By generalization and extension of the phase-shift-based precoding, a transceiver is more simplified, and a communication efficiency increases.

A method for performing a precoding based on a generalized phase shift or a precoding based on an extended phase shift in a Multi-Input Multi-Output (MIMO) system employing several sub-carriers, and a transceiver for supporting the same are disclosed. A phase-shift-based precoding matrix is generalized by multiplying a diagonal matrix for a phase shift by a unitary matrix for maintaining orthogonality between sub-carriers. In this case, a diagonal matrix part may be extended by multiplying a precoding matrix for removing an interference between sub-carriers by a diagonal matrix for a phase shift. By generalization and extension of the phase-shift-based precoding, a transceiver is more simplified, and a communication efficiency increases.

Methods, apparatuses, systems, and software for extended phase correction in phase sensitive magnetic resonance imaging utilizing an optimized region-growing based phase correction algorithm. Phase correction is formulated as selecting a vector for each pixel of an image from two input candidate vectors so that the orientation of the output vector is spatially smooth. In certain embodiments, the optimized region growing algorithm uses automated quality guidance for determining the sequence of region growing and jointly considers the two input candidate vectors during region growing. Further, the algorithm tracks the quality and the mode at each step of the processing. Spatially isolated tissue regions are automatically segmented and processed with different threads of region growing and the correct vector is reliably identified as the output vector for each thread of region growing. Final phase correction was performed by pixel level optimization.

The invention discloses an input voltage-sharing control method for an ISOS combined-type DC / DC converter, and the method comprises the steps: judging whether a single-module converter deviates from avoltage balancing working point or not through the independent calculation of the input voltage of the converter; employing an extended phase shift control method when one DC / DC converter deviates from the voltage balancing working point, adjusting the input voltage of the DC / DC converter through closed-loop control, enabling the DC / DC converter to return to the voltage balancing working point, and achieving the input voltage sharing. The extended phase shift control method can improve the power backflow in DC / DC conversion. For the ISOS combined-type DC / DC converter, the control method provided by the invention can adjust the transmission power, guarantees the power balancing among all modules, and achieves the voltage sharing and the stable output voltage. The method is high in practicality, is simple in control and is high in reliability.

The invention discloses a linear motor rotor position detecting method based on an extended phase correlation algorithm. The linear motor rotor position detecting method is characterized in that an aperiodic and strong-robustness fence image is engraved on the base of a linear motor to serve as a shooting source; during rotor operation, a high-speed camera is used to shoot in real time to obtain a series of partial fence images; the extended phase correlation algorithm is used to calculate the pixel displacement value between every two adjacent partial fence images; the pixel displacement values are used to obtain the actual displacement value and speed of the a linear motor rotor. The linear motor rotor position detecting method has the advantages that the extended phase correlation algorithm is used to achieve the non-contact precise measuring of the position of the linear motor rotor, and the high-precision measuring and robustness requirements can be satisfied.

The invention provides a phase-shifted full-bridge converter light load control method. According to the phase-shifted full-bridge converter light load control method, a control mode of a phase-shifted full-bridge converter is switched by detecting magnetization current magnitude of a transformer of the phase-shifted full-bridge converter. The phase-shifted full-bridge converter light load control method comprises the following steps: firstly, when the magnetization current of the transformer is larger, operating the phase-shifted full-bridge converter to be in an extended phase-shifted full-bridge control mode; secondly, when the magnetization current continues to decrease till the charge loaded by residual magnetization current is close to or less than half of a direct current input voltage, operating the phase-shifted full-bridge converter to be in a modified phase-shifted full-bridge control mode; lastly, allowing the phase-shifted full-bridge converter to achieve the greatest soft driving when the operation is under the modified phase-shifted full-bridge control mode. According to the method, the greatest soft driving of a switch element is realized, the overall efficiency is improved, the heating loss is reduced, and electromagnetic compatibility is realized.

The invention discloses an optimal power balancing method of a DC-DC converter in a power electronic transaction transformer. The method comprises the following steps: establishing a transmission power model and a current stress model under extended phase shift control according to an output parallel dual-active full-bridge DC-DC converter, and deducing internal phase shift amount and external phase shift amount of the dual-active full-bridge DC-DC converter under a current stress optimal control method in combination with a lagrangian multiplier method. Furthermore, for improving the dynamicfeatures of the converter, the actual transmission power of the converter is deduced and resolved by learning from the direct power control thought, and the transmission power loss of the converter iscompensated, thereby obtaining the final optimal phase shift control amount. Through the method disclosed by the invention, the transmission power balancing of various modules can be realized, and the abrupt change of the load resistance and the input voltage of the converter can be quickly responded; the method has the advantages of being fast in dynamic response, high in efficiency, simple in control process, and easy for digital realization, and strong in practicability.

A Extended Phase Center Tapered Slot Antenna (NC#97529). The apparatus includes a first antenna element capable of transmitting and receiving radio frequency energy; a second antenna element capable of transmitting and receiving radio frequency energy, wherein the first antenna element and the second antenna element are situated in a tapered slot antenna pair configuration; and at least one conductive launch structure, electrically coupled to the first antenna element and the second antenna element at a location between a lowest operating frequency phase center and a launch end of the tapered slot antenna pair configuration, capable of conducting electricity.

The invention discloses a double active bridge backflow power suppression based on modal analysis, an analysis method, and an analysis of the working process under three working modes in which an inductor current is greater than zero, equal to zero and less than zero at the time of secondary side switching operation in one switching cycle of a DAB controlled by SPS. Then the DAB mode is defined according to the circuit characteristics of each working mode, and the working process of DAB in various working modes is reconstructed based on the DAB mode. Analyze the working process of DAB with multiple modes of modal reconstruction, and analyze the cause of the reflux power; Then, based on the cause of the reflux power, the extended phase-shift control method is adopted to change the duty cycle of phase-shift and the timing of the driving signal of DAB primary switch, and the reflux power is reduced by adding the freewheeling mode similar to that of the basic DC / DC converter through the diode freewheeling mode during the DAB mode evolution. Finally, the reflux power after DAB suppression is analyzed, and the control parameters to reduce the reflux power are determined.

Methods, apparatuses, systems, and software for extended phase correction in phase sensitive Magnetic Resonance Imaging. A magnetic resonance image or images may be loaded into a memory. Two vector images A and B associated with the loaded image or images may be calculated either explicitly or implicitly so that a vector orientation by one of the two vector images at a pixel is substantially determined by a background or error phase at the pixel, and the vector orientation at the pixel by the other vector image is substantially different from that determined by the background or error phase at the pixel. A sequenced region growing phase correction algorithm may be applied to the vector images A and B to construct a new vector image V so that a vector orientation of V at each pixel is substantially determined by the background or error phase at the pixel. A phase corrected magnetic resonance image or images may be generated using the vector image V, and the phase corrected magnetic resonance image or images may be displayed or archived.

A digital delay locked loop uses a delay array to delay an input signal by an amount indicated by a delay code. A phase of the resulting delayed signal is compared to a corresponding phase of the input signal, and dependent on the comparison, the delay code is updated to indicate whether the delay array needs to provide more delay or less delay. The digital delay locked loop also uses a detection circuit that monitors for a predetermined condition of the delay code. In response to detection of the predetermined condition, the delay code is automatically reset to a value different than a value of the delay code present at a previous reset or initial startup of the digital delay locked loop.

The invention provides a phase-shifted full-bridge converter light load control method. According to the phase-shifted full-bridge converter light load control method, a control mode of a phase-shifted full-bridge converter is switched by detecting magnetization current magnitude of a transformer of the phase-shifted full-bridge converter. The phase-shifted full-bridge converter light load control method comprises the following steps: firstly, when the magnetization current of the transformer is larger, operating the phase-shifted full-bridge converter to be in an extended phase-shifted full-bridge control mode; secondly, when the magnetization current continues to decrease till the charge loaded by residual magnetization current is close to or less than half of a direct current input voltage, operating the phase-shifted full-bridge converter to be in a modified phase-shifted full-bridge control mode; lastly, allowing the phase-shifted full-bridge converter to achieve the greatest soft driving when the operation is under the modified phase-shifted full-bridge control mode. According to the method, the greatest soft driving of a switch element is realized, the overall efficiency is improved, the heating loss is reduced, and electromagnetic compatibility is realized.

Methods, apparatuses, systems, and software for extended phase correction in phase sensitive magnetic resonance imaging utilizing an optimized region-growing based phase correction algorithm. Phase correction is formulated as selecting a vector for each pixel of an image from two input candidate vectors so that the orientation of the output vector is spatially smooth. In certain embodiments, the optimized region growing algorithm uses automated quality guidance for determining the sequence of region growing and jointly considers the two input candidate vectors during region growing. Further, the algorithm tracks the quality and the mode at each step of the processing. Spatially isolated tissue regions are automatically segmented and processed with different threads of region growing and the correct vector is reliably identified as the output vector for each thread of region growing. Final phase correction was performed by pixel level optimization.

A system and method for processing highly undersampled multi-echo spin-echo data by linearizing the slice-resolved extended phase graph model generates highly accurate T2 maps with indirect echo compensation. Principal components are used to linearize the signal model to estimate the T2 decay curves which can be fitted to the slice-resolved model for T2 estimation. In another example of image processing for highly undersampled data, a joint bi-exponential fitting process can compensate for image variations within a voxel and thus provide partial voxel compensation to produce more accurate T2 maps.

A system and method for processing highly undersampled multi-echo spin-echo data by linearizing the slice-resolved extended phase graph model generates highly accurate T2 maps with indirect echo compensation. Principal components are used to linearize the signal model to estimate the T2 decay curves which can be fitted to the slice-resolved model for T2 estimation. In another example of image processing for highly undersampled data, a joint bi-exponential fitting process can compensate for image variations within a voxel and thus provide partial voxel compensation to produce more accurate T2 maps.

The invention discloses an angiography image sharpening method based on extended phase stretching transformation, and the method comprises the following steps: carrying out the preprocessing of an input image, carrying out the extended phase stretching transformation of an image, carrying out the thresholding and morphological processing of an obtained angle image, carrying out the edge detectionof relative total variation through combining with an RTV, and outputting a fusion image. The algorithm is mainly characterized in that firstly, a new extended phase stretching kernel function is provided, and the performance of the extended phase stretching kernel function is obviously superior to that of a traditional arc tangent S-type kernel function; and secondly, an edge detection strategy combining extended phase stretching transformation and total variation is designed. By adoption of the method, more abundant small-scale microvascular characteristics can be detected and enhanced. Cluttered background noise is inhibited, the noise is more robust. The extracted angiography edge characteristic image is fused with an original image to obtain a very good angiography image enhancement sharpening effect.

A mechanism for dealing with faster clock speeds by increasing the pulse width of the pump-up and pump-down pulses of a Hogge-type phase detector without dividing the clock. In particular, the NRZ data stream is divided into two, interleaved data streams which are provided through two series of flip-flops. By connecting the exclusive-OR gates separately to the two series of flip-flops to generate the pump-up and pump-down pulses, a longer time between transitions can be achieved by having alternate transitions (up and down) used by the two different series of flip-flops. In addition, delay circuits are provided to compensate for the clock-to-data output delay of the flip-flops.

One embodiment of the present invention relates to a phase alignment system including a plurality of samplers, a clock distributor, a phase detector and a phase alignment control. The samplers are configured to receive an incoming signal and a phase adjusted clock signal and to provide samples according to the incoming signal. The clock distributor receives a clock adjustment signal and generates the phase adjusted clock signal, which triggers sampling of the incoming signal. The clock adjustment signal indicates a direction of phase adjustment and can include an amount of phase adjustment. The phase detector receives the samples and provides extended phase alignment commands derived from the samples. The phase alignment control receives the extended phase alignment commands and provides the clock adjustment signal to the clock distributor.

The present invention relates to communication technology, in particular to a control method, device and system for beamforming. Flexible control for beamforming. The system is: by adding an extended phase-shift control device between each group of power amplifiers and antenna elements, further phase-shift control of each radio frequency signal (that is, the data to be sent) is added, that is, the method of extending the phase is used to improve Accuracy of phase control. In this way, an extended phase-shifting control architecture is constructed to make up for the low phase accuracy of analog beamforming. Combined with the antenna array element, it can further make fine-grained This allows for more precise phase control, enabling the control of radio frequency signals with a higher degree of precision, as well as beamforming control.

The invention discloses a transient phase shift control method for a dual-active active bridge, and the topological structure of the dual-active active bridge consists of two H bridges and a high-frequency transformer, the duty ratio of all switching tubes is 50%, and the switching tubes of the same bridge arm are in complementary conduction; the control method comprises the steps that the phase difference between the left upper switching tube and the right lower switching tube of the first H bridge is an inner phase shift angle, and the phase difference between the switching tube of the second H bridge and the right lower switching tube of the first H bridge is an outer phase shift angle. In a transient state, when a phase shift angle is adjusted at t0, for example, an outer phase shift angle is changed from an initial state D2 to a final state D2, and an inner phase shift angle is changed from an initial state D1 to a final state D'1; in a half cycle starting from t0, an outer phaseshift angle is changed from an initial state D2 to a transition state D''2, and an inner phase shift angle is changed from an initial state D1 to a transition state D''2; and then the outer phase shift angle is changed into a final state D'2, and the inner phase shift angle is changed into a final state D'2. A half-cycle transition phase shift angle is introduced, so that the current impact of thetransformer is reduced on the basis of not changing the power flow characteristics, and the dynamic response rate is improved.

The invention relates to an amplitude detection method and an amplitude detection system for a sine signal. The method comprises the following steps: truncating a sampled signal sequence to obtain a truncated signal sequence; respectively multiplying the cosine function of a measured reference frequency and the sine function of the reference frequency by the signal sequence and the truncated signal sequence to generate two sets of real-frequency vector sequences and virtual-frequency vector sequences; digitally trapping the two sets of real-frequency vector sequences and virtual-frequency vector sequences to generate two sets of imaginary vector trap sequences and real vector trap sequences, and generating two sets of imaginary vector integral values and real vector integral values through integration; converting the two sets of imaginary vector integral values and real vector integral values into a sequence amplitude and two phases, and extending the two phases to obtain extended phases; converting the two extended phases into a frequency difference; and converting the sequence amplitude and the frequency difference into the fundamental amplitude of the sine signal. By implementing the method and the system of the invention, fundamental amplitude of high accuracy can be obtained.

The invention relates to a method and device for determining the transmission power of a dual-active bridge circuit under extended phase shift control and belongs to the technical field of circuit control. The method comprises the steps that: a circuit parameter of a to-be-detected dual-active bridge circuit in one switching period is obtained; a power transmission function and a boundary function thereof are determined according to a circuit parameter power calculation formula in one switching period; according to the power transmission function and the boundary function thereof, a power transmission model is constructed, the power transmission model takes an external phase shift angle and an internal phase shift angle as independent variables and takes transmission power as a dependent variable, and the value ranges of the external phase shift angle and the internal phase shift angle are both (-1, 1); and according to the power transmission model, power transmission analysis is performed on the to-be-detected dual-active bridge circuit to determine the transmission power of the dual-active bridge circuit. According to the method and device provided by the technical schemes provided by the invention, power output analysis can be carried out on the DAB in a full phase-shift angle range, so that the applicability of the extended phase shift control power transmission analysis method is improved.

Extending the PWM phase offset when generating a phase-shifted PWM signal group is achieved by means of a separate phase counter that is independent of the time-base counter used in conventional PWM generation circuits and is prevented from retriggering until the existing duty cycle has completed. This is accomplished with phase offset counters, phase comparators and circuits triggered via an overall synchronized master time base for multi-phase PWM signal generation.

The invention discloses a method for analyzing OPGW (optical fiber composite overhead ground wire) system grounded short-circuit current on the basis of an extended phase-component method. A phase wire and an OPGW are taken as a whole, the interaction of the phase wire and the OPGW is considered, and the phase wire and the OPGW are analyzed with a consistent analysis model. By means of the method, the electrical quantities, distributed along wires, of short-circuit current and the like on the OPGW and the phase wire of a power transmission system can be accurately obtained when single-phase ground short circuit happens. The method is applicable to two different situations of a power transmission system of a single-ended power supply and a power transmission system of a double-ended power supply; the mode for operating two OPGWs simultaneously in the power transmission system is also contained; a complicated operation mode that whether the two OPGW wires are sectionally insulated and whether pole towers are grounded step by step is further contained; the distribution rule, calculated with a new algorithm, of the short-circuit current on the OPGWs is further contained. The method adopts a mature technology and is high in reliability.

The invention discloses a reflux power optimization method suitable for a modular multi-level DC transformer, wherein an MMC bridge arm and an H bridge form an MMC-H bridge type DC transformer, an MMCside is set to be a nearest level modulation strategy, the H bridge adopts an extended phase-shifting modulation with internal phase-shifting, and analyzes the operation characteristics of the DC transformer; According to MMC-H bridge type DC transformer topology and operation characteristics, transmission power expressions of the DC transformer based on the nearest approximation modulation strategy and extended phase-shift control are derived. For the derived power expression, the distribution of power with parameters is analyzed, the factors affecting the return power are summarized, and the optimal configuration of voltage regulation ratio, the boundary conditions of scouring zero return power and the optimal working interval of return power and the region of zero return power are discussed. By adjusting the internal and external phase shifting, DC transformer can work in the optimal working range of reflux power to reduce the reflux power and current stress. This method can reducethe reflux power and current stress.