113 results about "Dynamic modulation" patented technology

A technique is disclosed for facilitating communications between a network node and a Head End of an access network. The access network includes a plurality of nodes which communicate with the Head End via at least one upstream channel and at least one downstream channel. The Head End is configured to monitor channel conditions on selected channels of the access network. The Head End is also configured to modify or change the modulation profile used on a selected channel in response to detecting a change in conditions on that particular channel. If the Head End detects that the channel conditions have deteriorated, the Head End may change the modulation profile on the selected channel to one which is better suited for transmitting data on the channel given the current channel conditions. If the Head End detects that the channel conditions have improved, the Head End may change the modulation profile on the selected channel to one which provides for faster data transmission on the selected channel.

The microwave transmitter of the present invention can perform two-terminal dynamic modulation with respect to the voltage supply terminal and the RF input terminal of a RF power amplifier. The microwave transmitter of the present invention comprises a first modulator and a second modulator. The first modulator uses the baseband digital delta-sigma modulation technique to process the envelope signal and outputs this signal to the voltage supply terminal of the RF power amplifier as a supply voltage. The second modulator uses the baseband digital pre-distortion technique to process the IQ-modulated carrier and outputs this signal to the RF input terminal of the RF power amplifier as a RF input signal. Thereby, the RF power amplifier can highly efficiently reconstruct the power-amplified RF modulated carrier without distortion at the RF output terminal. In addition, the baseband digital processing techniques used in the two modulators make the microwave transmitter of the present invention suitable for multi-mode operation.

The embodiments described herein provide devices and methods that facilitate improved input device performance. Specifically, the devices and methods provide an input device configured to determine positional and force information for input objects interacting with a sensing region. The system is configured to detect a variable force imparted to an input surface of the sensing region by at least one input object. The variable force dynamically modulates, within a modulation range, a user interface parameter. The dynamic modulation of the interface parameter is modified in response to an additional input object contacting the input surface

The invention discloses a graphene phase type light modulator based on a planar waveguide. The light modulator comprises a substrate layer, the light waveguide, a first dielectric filling layer, a second dielectric filling layer and an electrode structure. The first dielectric filling layer, the second dielectric filling layer and the light waveguide are located at the upper end of the substrate layer. The light waveguide is composed of a first rectangular waveguide body, a first isolation dielectric layer, a first graphene layer, a second isolation dielectric layer, a second graphene layer, a third isolation dielectric layer and a second rectangular waveguide body in sequence from bottom to top. The electrode structure comprises a first metal layer and a second metal layer, and the first metal layer and the second metal layer are deposited on the upper end face of the extending part of the first graphene layer and the upper end face of the extending part of the second graphene layer respectively. The graphene layers are embedded in the light waveguide bodies, interaction between graphene and light is enhanced, the resistance of a system is reduced, the modulation rate of the modulator is increased, the effective refractive index change in the waveguide can be effectively regulated, and dynamic modulation on a light field phase is achieved.

The invention provides an adjustable broadband polarization conversion and dynamic geometric phase modulation device based on phase change material, comprising a metal reflecting layer, a phase changematerial layer, a dielectric isolation layer and a super surface structural layer sequentially from bottom to top. The design of the polarization conversion and geometric phase modulation device is carried out based on the phase change material; optical material parameters of the phase change material, such as crystal state and dielectric constant, are changed by means of electric excitation, optical excitation and thermal excitation; dynamic modulation of polarization conversion is achieved within a broad band range; accordingly, designs of a novel functional device, such as adjustable beamdeflection, plate lens, and calculation of holographic and orbital angular momentums. A method of the invention may provide further improved ability of electromagnetic modulation of super surface, anda new idea and technical scheme are provided for the design of novel adjustable-function electromagnetic modulation elements.

The invention provides a method for cross layer resource distribution and grouped dispatch in a cognitive wireless network, which belongs to the technical field of wireless communication. In the method, the following factors are integrally considered: the service priority level of each user in the cognitive wireless network; the line length in a buffer pool formed by sub users waiting for the frequency spectrum distribution and the grouping time-out condition; the minimum speed requirement of the users; and information of the emitting power upper limit of a cognitive wireless base station and the like. The cross layer configuration can be carried out on the parameters of media access control (MAC) layers and physical layers of user sub carrier distribution, dynamic modulation modes, multi-user grouped data service sequence, power and bit distribution and the like according to an improved cross generation elitism selection heterogeneous recombinant cataclysmic mutation resource management (CHCRM) algorithm, and the cross layer integral optimization on the cognitive wireless network is realized. The average time delay of a system is reduced, and the system packet loss is reduced.

A method and system for Multicast Broadcast Service (MBS) over Mobile Multi-hop Relay (MMR) network using dynamic modification of Modulation and Coding Scheme (MCS) level are provided. The base station of the system for MBS over MMR network using dynamic modification of MCS level comprises: Adaptive Modulation and Coding (AMC) table for storing the MCS level for the transmission between the BS and relay station (RS), throughput corresponding to the MCS level, and spectrum efficiency corresponding to the MCS level; and Dynamic Modulation and Coding (DMC) table for storing the MCS level for the transmission between the RS and MS to be changed upon update of the AMC table. If there is any change of the MCS level for the transmission between the RS and MS, the BS transmits a MCS control message to the RS informing of the MCS level change such that MBS data is transmitted with the changed MCS level.

The invention belongs to the field of optical imaging test, more particularly to a method and a device for measuring a multispectral dynamic modulation transfer function, which can be used for a dynamic performance test of a composite photoelectronic imaging system. In the invention, a multispectral knife-edge division target plate is collimated by an collimating system and then imaged in a tested photoelectronic system fixed on a vibrating table, and modulation transfer functions under different conditions can be obtained after a knife-edge image obtained by the tested photoelectronic imaging system is processed by a computer and then calculated to obtain the tested dynamic modulation transfer function. By translating or rotating the multispectral knife-edge division target plate to simulate target motion and using the vibrating table to simulate the vibration of a weapon platform, the tested dynamic modulation transfer function is real and all-sided, can be used for estimating the dynamic performance of the composite photoelectronic imaging system under the actual service condition and has extremely important application prospect.

The present invention provides a dynamically-adjustable multi-frequency electromagnetic wave-absorbing material. The material comprises, in turn from bottom to top, an underlying metal reflective layer, a dielectric spacer layer and a top metal sub-wavelength structure array. The material for the dielectric spacer layer is a GST phase change material. In the invention, the crystalline state (phase) of the GST material is changed by means of electrical excitation, optical excitation or thermal excitation and thus optical parameters of the GST material, such as a dielectric constant, are changed, so multi-band absorption of the wave-absorbing material within the infrared range and dynamic modulation of the wave-absorbing frequency band are realized, thereby improving the flexibility of the wave-absorbing material. In addition, the present invention can also realize a conformal design with a complex face object.

The invention discloses a metallic molten pool internal contour online measurement device and method. The device comprises an excitation assembly, a receiving assembly and a computer for data analysisand control; the excitation assembly comprises a laser, a beam splitter for dividing a beam emitted by the laser into a plurality of beams, and a plurality of sets of array optical fibers for receiving the plurality of beams respectively; and the computer is provided with a dynamic modulation module for dynamically modulating the beam. With the metallic molten pool internal contour online measurement device and method of the invention adopted, metallic molten pool internal contour online measurement can be realized based on a laser ultrasonic phased array detection technology; and a printingprocess can be adjusted according to a detection result, so that high manufacturing quality of parts can be realized.

According to the brightness distribution of a previous frame, the driving current of the backlight module dynamically varies. When the concentration of the brightness distribution is toward high brightness, the backlight module increases its luminous intensity. On the contrary, when the concentration of the brightness distribution is toward low brightness, the backlight module decreases its luminous intensity. We can set the luminous modulation period of the backlight module to be synchronized with a vertical scanning period or several vertical scanning periods.

A laboratory analog system of atmosphere turbulent optical effect based on micro optical technology uses driving unit to drive random phase disc to rotate for simulating dynamic modulation effect of atmospheric turbulence to optical wave phase.

The invention relates to a modulation method for air plasma generated terahertz wave; the method comprises the steps of first, designing a lens phase diagram that is a phase distribution diagram of lens phase factors; second, loading the lens phase diagram to a light path system for air plasma generated terahertz wave so as to generate plasma filaments and to irradiate terahertz wave; the step of designing the lens phase diagram in the first step includes: a, adjusting phase distribution of the lens phase diagram, and using the light path system for air plasma generated terahertz wave to generate terahertz wave; b, studying relationship between the spectrum of the generated terahertz wave and the form of generated plasmas; c, setting the spectrum of terahertz wave expectedly to be generated, calculating spacing of two plasmas that generate the terahertz wave; d, calculating equivalent focal length f1 of the lens phase diagram; e, designing the lens phase diagram. The method according to the embodiments of the invention is simple to perform, dynamic modulation is provided for the spectrum of terahertz wave, and energy utilization rate is increased.

The invention discloses a time-of-flight (TOF) sensor and a light source modulation method therefor. The TOF sensor comprises a light source module and a sensing chip. The sensing chip comprises a sensing module, a processing module, and a light source control module. The sensing module is used for acquiring a reflected light signal of a measured object. The processing module is connected to the sensing module and used for acquiring ambient light information according to the reflected light signal, and generates a control instruction for a light source according to the ambient light information. The light source control module is connected to the processing module, and is used for adjusting an emission parameter of the light source module according to the control instruction. According tothe TOF sensor and the light source modulation method therefor, the light source can be dynamically modulated according to ambient light changes.

The invention relates to a method for dynamically regulating and controlling a metamaterial based on an IGZO Schottky diode. The IGZO Schottky diode comprises a substrate, a Schottky electrode, an amorphous indium gallium zinc oxide active layer and an ohmic electrode which are successively grown from bottom to top. The method comprises the following steps: (1) taking the metamaterial as the Schottky electrode, making the amorphous indium gallium zinc oxide active layer completely cover a capacitive structure in the metamaterial, and combining the capacitive structure in the metamaterial withthe amorphous indium gallium zinc oxide active layer to form a Schottky barrier; and (2) dynamically regulating and controlling the metamaterial through the IGZO Schottky diode processed in the step (1). In the invention, great dynamic modulation of electromagnetic characteristics including transmittance, reflectivity and absorptivity of the metamaterial is realized; and simultaneously, a resonantfrequency of a metamaterial structure design is not affected, the method can be applied to various metamaterial devices and plasmon devices with metamaterial structures, and dynamic regulation and control of electromagnetic waves transmitted in space and the electromagnetic waves transmitted on a surface is achieved.

The invention provides a method and device for selecting a modulation and coding scheme. The method comprises the steps of: regulating ranges of a mean carrier and an interference-to-noise ratio in parameters of a reference modulation and coding scheme by a receiver according to interferences and noise power of a measured subframe; calculating to obtain a mean carrier and an interference-to-noise ratio in a predetermined period by the receiver according to the mean interference and the noise power in a predetermined period of the measured subframe; and determining information on the modulation and coding scheme by the receiver by comparing the regulated range of the mean carrier and the interference-to-noise ratio based on the mean carrier and the interference-to-noise ratio, which are obtained through calculation, in the predetermined period. Accordingly, the influence brought by channel condition changes to selection of the dynamic modulation and coding scheme is eliminated.

The invention discloses a cooperative positioning method and system based on the wireless Internet of Things, and the method comprises the steps: enabling a cooperative service node to serve as a positioning base station to analyze the object access information of service object equipment, extracting a beacon modulation state identification and a positioning signal receiving variable value, performing positioning signal receiving correction and positioning feature calculation on the positioning signal receiving variable according to the beacon modulation state identifier to obtain a calculatedvalue of a positioning feature variable of the service object device, judging based on the beacon modulation state identifier and/or the positioning characteristic variable of the service object device, and enabling the service object device to perform positioning beacon resetting and positioning state updating according to the corresponding object beacon modulation parameter when necessary. Theservice object equipment dynamically modulates and sends the object state beacons of different beacon transmitting power levels and time sequence combinations thereof based on the positioning requirements, so that unnecessary power consumption is saved, cross interference is avoided, and the positioning calculation precision, continuity and real-time credibility are improved.

The invention discloses an MPPSK demodulation method based on location information. A simplified expression of MPPSK modulation is taken as a basis, in the expression, Omega c is taken as angular frequency of modulated carrier, Tc= 2Pi/Omega c is taken as a carrier period, 0<= rg <1 is taken as a symbol protection interval control factor, and a modulation parameter which changes signal bandwidth, transmission efficiency and demodulation performance is composed by the rg, an integer M, an integer N and an integer K. The method based on a shock filter particularly comprises: 1) initially sending multiple MPPSK modulation signals with a symbol '1' so as to be used for transiting positioning and confirmation of initial oscillation and a location original point of the shock filter; 2) after completing positioning of the location original point, calculating a corresponding demodulation symbol of the location information through confirming of the location of the shock; 3) feeding back theoretical location information corresponding to the demodulation symbol, achieving dynamic modulation of the position original point, and finally achieving demodulation of the MPPSK signal. A multi-system M affects little on the performance of the method, and demodulation can be completed without needing a synchronous clock.

An integrated device of the present invention comprises free-space optics, a bi-directional multiplexor/de-multiplexor, a diffractive light modulator, a beam splitter, an optical performance monitor, and a controller. The free-space optics collimate, transform and image optical signals including a range of component wavelength signals. The bi-directional multiplexor/de-multiplexor de-multiplexes a wavelength division multiplexed signal into the component wavelength signals and multiplexes equalized component wavelength signals into an equalized wavelength division multiplexed signal. The diffractive light modulator selectively equalizes each component wavelength signal. The beam splitter is optically coupled in free-space to the diffractive light modulator for receiving the equalized component wavelength signals and re-directing a representative portion of each of the equalized component wavelength signals. The optical performance monitor receives and detects relative power levels of each representative portion of the equalized component wavelength signals. The controller receives the detected power levels, provides feedback signals and dynamically modulates the diffractive light modulator in response thereto to maintain a desired level of each of the equalized component wavelength signals.

The invention provides a mechanics analysis device for piezomodulated and sensed single cell, comprising a piezoelectric chip, a detecting tank, and a controlling and detecting system. The mechanics analysis device is characterized in that the piezoelectric chip is encapsulated in the detecting tank; the mechanic dynamic analysis on the piezomodulated and sensed single cell is carried out by controlling an detecting system; the piezoelectric chip consists of a piezoelectric sheet and at least one group of electrodes arranged on the surface of the piezoelectric sheet; one group of electrode pairs and the piezoelectric sheet form a piezoelectric resonator; the electrode pair comprises at least one micro-electrode with the area matched with that of the single cell and surface decorated chemically; the single cell is naturally fixed on the chemically decorated micro-electrode in a bonding way; the microelectrode can generate vibration by the controlling and detecting system and can interact with the bonding cell, thus synchronously realizing the dynamic modulation and real-time induction of the single cell mechanics. The device and the method aim at solving the problem of difficulty on modulation and monitoring of the cell mechanics in the single cell mechanics technology and have the characteristics of no existence of non-mechanic interference, high simpleness and flexibility, high flux and the like; the bio-mechanic characteristics of the cell can be discovered on cell layer, time and space; and the mechanics analysis device can be suitable for application in the wide fieldssuch as biomechanics, tissue engineering, drug screening, clinical medicine, and the like.

The invention relates to a device and a method for realizing electric regulation and control of Fano resonance based on asymmetric split-ring resonators. A variable capacitance diode is embedded in the middle of each of the two split-ring resonators, and meanwhile, feeding wires are added to the upper side and lower side of the two split-ring resonators respectively; the feeding wires are connected with an external power supply and adjust the voltage at the two ends of the variable capacitance diode; and inductors are added between the feeding wires and the split-ring resonators respectively to isolate the influence of the feeding wires on the electromagnetic response of the metamaterial structure. The working state of the variable capacitance diode is adjusted by using the feed voltage, and then the working frequencies of the two split-ring resonators are adjusted, so that dynamic modulation of the Fano resonance transmission spectral line is realized. The two split-ring resonators are different in size, the asymmetric structure is utilized to excite a magnetic four-level mode, and destructive interference occurs between the magnetic four-level mode and a magnetic dipole mode excited by an electric field, so that the transmission spectral line shows a Fano resonance line type.

The invention discloses a system for detecting a piston error between adjacent spliced mirrors, and the system comprises: a transmitting unit which is used for providing broadband light; a modulationunit which comprises a spatial light modulator and a scattering medium and is used for dynamically modulating broadband light; a light splitting unit which is used for splitting light and respectivelytransmitting the light to the spectral measurement unit and the reflecting surface of the splicing sub-mirror; a spectral measurement unit which is used for measuring spectral distribution modulatedby the spatial light modulator and the scattering medium; a splicing sub-mirror which is used for reflecting the light beam split by the light splitting unit to the imaging unit; an imaging unit whichis used for collecting diffraction patterns; and a processing unit which is used for controlling the spatial light modulator to adjust the spectral shape and distribution to a specified shape, and isalso used for analyzing and processing the diffraction pattern to obtain a piston error value between two adjacent spliced sub-mirrors. According to the system, the 2pi fuzzy effect is overcome, thedetection range of the piston error of the adjacent splicing mirrors is dynamically adjustable, and a large measurement range and high measurement precision can be realized at the same time.

The invention provides a receiving end power grid dynamic load flow analysis method and system after a DC fault of an electric power system. The method includes the following steps: acquiring the real-time power grid operation data information of an electric power system, computing deletion power of a receiving end power grid after a DC fault, computing one dynamic modulation frequency of a receiving end system, computing a load and an operation set output adjusting amount, resolving an unbalanced power of the receiving end power grid, determining whether the unbalanced power meets convergencecriterion, if the unbalanced power meets convergence criterion, computing the load flow of the electric power system of the entire power grid, and if the unbalanced power does not meet convergence criterion, returning to step 3 and performing iterative computation, and if the unbalanced power meets convergence criterion, performing load flow computation, and finally outputting a computation result. The system includes: a data acquiring module, a computation module, a determination module and an output module. According to the invention, the technical solution herein addresses the inaccurate computation that is caused by failure to consider system dynamic frequency characteristics of traditional load flow computation of the electric power system, and can increase the accuracy of system load flow analysis result after the fault of the electric power system.