Patents
Literature
Patsnap Eureka AI that helps you search prior art, draft patents, and assess FTO risks, powered by patent and scientific literature data.

434 results about "Up conversion" patented technology

Systems and methods for generalized multi-hypothesis prediction for video coding

Systems and methods are described for video coding using generalized bi-prediction. In an exemplary embodiment, to code a current block of a video in a bitstream, a first reference block is selected from a first reference picture and a second reference block is selected from a second reference picture. Each reference block is associated with a weight, where the weight may be an arbitrary weight ranging, e.g., between 0 and 1. The current block is predicted using a weighted sum of the reference blocks. The weights may be selected from among a plurality of candidate weights. Candidate weights may be signaled in the bitstream or may be derived implicitly based on a template. Candidate weights may be pruned to avoid out-of-range or substantially duplicate candidate weights. Generalized bi-prediction may additionally be used in frame rate up conversion.
Owner:INTERDIGITAL VC HOLDINGS INC

Ultra-low power consumption multichannel high-speed signal synchronous acquisition and emission system suitable for satellite communication

The invention relates to an ultra-low power consumption multichannel high-speed signal synchronous acquisition and emission system suitable for satellite communication. The system comprises an acquisition and emission board card which mainly comprises a plurality of radio frequency transceivers, an optical module, a clock unit, an FPGA (Field Programmable Gate Array) 1 processor and the like; the clock unit comprises a clock chip, a clock Buffer and the like; the optical module is used for receiving data, sending the data to an FPGA (Field Programmable Gate Array) 1 for processing, then sending the data to a transmitting channel of the radio frequency transceiver through a JESD204B interface for interpolation filtering, QEC (Quadrature Error Correction) calibration and refreshing, and then performing up-conversion to output an I / Q analog modulation signal; a receiving channel of the radio frequency transceiver receives an I / Q analog signal, the I / Q analog signal is sampled after low-pass filtering, the sampled data is sent to the FPGA1 for processing through the JESD204B interface after QEC calibration, and then the data is forwarded through the optical module. The system can realize ultra-low power consumption and reduce the weight of the whole machine.
Owner:HUNAN SIBEITU TECH CO LTD

Regional adjustable intermittent sampling interference method and system for SAR (Synthetic Aperture Radar) platform of unmanned aerial vehicle

The invention discloses a regional adjustable intermittent sampling interference method and system for an unmanned aerial vehicle SAR platform, and the method specifically comprises the steps: generating radar original data according to an intercepted unmanned aerial vehicle carried SAR signal; adopting a Bernoulli mapping sequence to carry out intermittent sampling on SAR signals of the unmanned aerial vehicle, and generating a randomly distributed non-uniform false target group; according to the generated intermittent sampling signal controlled by the Bernoulli mapping sequence, the distance direction and the azimuth direction of the SAR signal are interfered by using a distance direction frequency shift and false motion target characteristic modulation method, and a smart interference signal controlled by the Bernoulli mapping sequence after modulation is generated, so that the interference signal has a false motion characteristic; and after digital-to-analog conversion, low-pass filtering and up-conversion processing are carried out on the generated interference signal, the interference signal is sent by using a transmitting antenna, and interference on the SAR platform radar of the unmanned aerial vehicle is completed. The real moving target in the specific area is protected, and the method has the advantages of being simple, high in real-time performance and good in interference effect.
Owner:NANJING UNIV OF SCI & TECH

Auto-calibrating mixers in a quantum orchestration platform

This disclosure describes an auto-calibration of mixers in a quantum orchestration platform. Predistortion is computed according to an RF signal that is downconverted with a local oscillator tone that is offset from an upconverter tone. Three tones present in the original RF signal are distinguished and used to construct a cost function. The minimization of the cost function is used to cancel an unwanted LO leakage and an image tone. Because the quantum orchestration platform generates both the unconverted IQ signals and the cost function for their optimization, the optimization can be performed in real time inside a single device without the need to communicate with external devices. This allows for the optimization of single sideband upconverted signals in a fraction of the time it typically takes using distributed systems employing separate waveform generators and spectrum analyzers.
Owner:Q M TECH LTD +1

Radar system for realizing communication and inductance integration

The invention specifically relates to a radar system for realizing communication and inductance integration, and the system comprises a field programmable gate array signal processing assembly which is used for generating an initial local oscillation signal and a customized initial emission waveform according to a control instruction of an upper computer, and outputting the initial emission waveform to an emission assembly, outputting the initial local oscillation signal to a local oscillation system component; the transmitting component is used for modulating a self-defined initial transmitting waveform, then generating a target transmitting signal and transmitting the target transmitting signal; the receiving component is used for receiving the reflected signal and modulating the reflected signal; the local oscillation system component is used for performing frequency conversion processing on the initial local oscillation signal and outputting a first LO signal subjected to up-conversion processing to the transmitting component, so that the transmitting component modulates the first LO signal and a customized initial transmitting waveform; and outputting the second LO signal subjected to down-conversion processing to a receiving component, so that the receiving component modulates the second LO signal and the reflected signal.
Owner:KUNSHAN INNOVATION RES INST OF XIAN UNIV OF ELECTRONIC SCI & TECH +1

Temporal based subblock type motion vector predictor

In a method of video encoding, a corresponding block of a current block in a current picture is determined based on an offset vector that indicates an offset between the current block and the corresponding block. The current block includes a plurality of subblocks to be encoded in a subblock-based frame-rate up conversion (FRUC) mode. A temporal motion vector predictor (TMVP) of a first subblock in the corresponding block is determined based on a subblock in a forward reference picture of the current picture and a subblock in a backward reference picture of the current picture. The subblocks in the forward reference picture and the backward reference picture are matched using the subblock-based FRUC mode. Based on the TMVP, a TMVP of a subblock is determined in the plurality of subblocks in the current block.
Owner:TENCENT AMERICA LLC

Radio frequency conversion assembly

The invention relates to the technical field of radio frequency, in particular to a radio frequency conversion assembly, and the assembly comprises a baseband processing unit which employs a millimeter wave SoC chip and is used for generating and processing an initial transmitting signal of 79-81GHz and an initial receiving signal of 79-81GHz; the frequency conversion unit comprises an up-conversion subunit and a down-conversion subunit, and the local oscillation synthesis unit is used for generating and providing a local oscillation signal with a fixed frequency; the mode switching and processing system is used for selectively performing down-conversion processing on the echo signal or a target radio frequency signal from an external non-cooperative irradiation source in two working modes and then transmitting the echo signal or the target radio frequency signal to the baseband processing unit; the working mode comprises an active mode and a passive mode.
Owner:BEIJING SCI & TECH RUIXING ELECTRONIC TECH CO LTD

Millimeter wave transceiver and state monitoring method

The invention discloses a millimeter wave transceiver and a state monitoring method, and belongs to the technical field of millimeter wave communication. Comprising a transceiver circuit, and the transceiver circuit is arranged on a transceiver structure. The transceiver circuit comprises an EMI circuit, a power supply system, a heat dissipation system, an up-conversion assembly, a local oscillator assembly, a down-conversion assembly, a one-to-four filtering power divider and a monitoring system. And the monitoring system is used for controlling the working states of each circuit, assembly, system and device, executing an intermediate frequency signal processing flow when receiving an intermediate frequency signal, and executing a millimeter wave signal processing flow when receiving a millimeter wave signal. The millimeter wave transceiver integrates various components, improves the integration level of the millimeter wave transceiver through a tiled layout mode and a modular design, improves the aesthetic property and safety of a product, and is extremely high in product integration level, small in size, light in weight, low in hardware cost, high in product reliability, short in later maintenance time and low in maintenance cost.
Owner:CHENGDU TOPANTECH CO LTD

Multipath effect suppression method for 2.4 GHz radio frequency identification

The invention discloses a multipath effect suppression method for 2.4 GHz radio frequency identification. The multipath effect suppression method comprises a transmitting end processing flow and a receiving end processing flow. A transmitting end carries out pulse code modulation on an analog signal to obtain a digital signal, blocks the digital signal after channel coding, and distributes the digital signal to subcarriers through quadrature amplitude modulation; and generating a time domain OFDM symbol through IFFT (Inverse Fast Fourier Transform), adding a cyclic prefix and a synchronization head, converting into an analog baseband signal, and performing up-conversion, filtering, amplification and radiation. The receiving end amplifies the signal, down-converts the signal to a baseband, filters the signal and converts the signal into a digital signal; the method comprises the following steps of: synchronizing header frame alignment, recovering a coding bit stream through FFT (Fast Fourier Transform) and QAM (Quadrature Amplitude Modulation) demodulation, carrying out CRC (Cyclic Redundancy Check) after decoding and merging, returning ACK (Acknowledgement Character) if According to the method, the multipath effect can be effectively inhibited, and the integrity of received data is improved.
Owner:RICE MICROELECTRONICS

Embedded special-purpose high-frequency low-level control system

The invention discloses an embedded special high-frequency low-level control system, which comprises a digital signal processing board card, an ADC / DAC sub-board card and a radio frequency front-end board card, the radio frequency front-end board card comprises two paths of up-conversion channels and six paths of down-conversion channels; the digital signal processing board card comprises an FPGA (Field Programmable Gate Array); wherein the radio frequency front-end board card is used for dividing an input reference line RF signal into four paths of RF reference signals and generating an LO signal; the ADC / DAC sub board card is used for ADC analog-to-digital conversion and DAC digital-to-analog conversion; the main functions of the digital signal processing board card comprise clock distribution of RF reference signals, a motor drive and piezo ceramic drive circuit, a data acquisition and logic control algorithm of an FPGA logic unit PL part, an embedded ARM system of an FPGA processor unit PS part, EPICS-IOC application of a low-level system, network data communication and the like.
Owner:INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI

5G optical fiber remote system supporting voice function

The utility model relates to a 5G optical fiber remote system supporting a voice function. Comprising a duplexer 1, a low noise amplifier 1, a down converter 1, an AD analog-to-digital converter 1, a power amplifier 1, an up converter 1, a DA digital-to-analog converter 1, a single chip microcomputer MCU1, a voice processing module, a duplexer 2, a low noise amplifier 2, a down converter 2, an AD analog-to-digital converter 2, a power amplifier 2, an up converter 2, a DA digital-to-analog converter 2, a digital signal processor FPGA1 and an optical module 1. The far-end unit comprises a duplexer 3, a low-noise amplifier 3, a down-converter 3, an AD analog-to-digital converter 3, a power amplifier 3, an up-converter 3, a DA digital-to-analog converter 3, a single-chip microcomputer MCU2, a duplexer 4, a low-noise amplifier 4, a down-converter 4, an AD analog-to-digital converter 4, a power amplifier 4, an up-converter 4, a DA digital-to-analog converter 4, a digital signal processor FPGA2 and an optical module 2. According to the utility model, main parameters can be modified, set and output according to voice.
Owner:CHINA YOUKE COMM TECH

Optical up-conversion, optical fiber transmission and self-interference elimination integrated device and method

The invention discloses an optical up-conversion, optical fiber transmission and self-interference elimination integrated device and method. The invention discloses an optical up-conversion, optical fiber transmission and self-interference elimination integrated device which comprises a central station, a transmission medium and a far-end base station. Wherein the central station comprises a first wavelength tunable laser (1), a local oscillator signal generator (2), a second wavelength tunable laser (3), a first double-parallel Mach-Zehnder modulator (4), an electric power divider (5), a second double-parallel Mach-Zehnder modulator (6), a 90-degree polarization rotator (7) and a polarization beam combiner (8). And a transmission medium adopts a single-mode optical fiber (9). The far-end base station comprises an optical power amplifier (10), a polarization beam splitter (11), a first photoelectric detector (12), a second photoelectric detector (13), an electric power amplifier (14), a transmitting antenna (15) and a receiving antenna (16). The invention further provides an optical up-conversion, optical fiber transmission and self-interference elimination method. According to the invention, the influence of the up-conversion transmission signal on the signal received by the far-end base station can be eliminated, the transmission quality of the received signal is improved, and the base station is simplified.
Owner:AIR FORCE UNIV PLA

Shipborne radar signal source with zero-discontinuity parameter switching capability

The invention discloses a shipborne radar signal source with zero-discontinuity parameter switching capability, which relates to the technical field of shipborne radars and comprises a transmitting end control unit and a radio frequency output unit. The transmitting end control unit is sequentially provided with a parameter management and pre-installation layer, a waveform synthesis layer, a deterministic delay and switching control layer, a time base consistency and channel calibration layer and a recording and diagnosis layer from the top layer to the bottom layer to form complete link output; the radio frequency output unit is provided with a digital-to-analog conversion and intermediate frequency up-conversion link and an external up-conversion and power amplifier link. A double DDS ping-pong and pre-installed preheating switching mechanism, a phase state copying and aligning mechanism, a delay calibration and on-line compensation mechanism and a multi-channel time base consistency and channel calibration mechanism are provided, the problems of interruption, amplitude phase jump, moment jitter, poor multi-channel consistency and the like existing in the parameter switching process of an existing simulation source are solved, and meanwhile the simulation source has the event recording and diagnosing functions. And the reliability and the accuracy of the electric detection equipment on the sea test are ensured.
Owner:SICHUAN LEIDUN ELECTRONICS CO LTD

Integrated reconnaissance interference method and system based on transmit-receive cancellation technology

The invention relates to the technical field of data processing, and discloses an integrated reconnaissance interference method and system based on a transmit-receive cancellation technology, and the method comprises the steps: receiving a mixed signal containing a target radar signal and a leakage interference signal through a receiving channel, and obtaining a first digital signal after down-conversion and analog-to-digital conversion, the leakage interference signal is a signal leaked from the transmitting channel to the receiving channel; acquiring a second digital signal corresponding to an interference signal generated in the transmitting channel, and transmitting the interference signal through an antenna after digital-to-analog conversion and up-conversion; taking the second digital signal as a reference signal, performing adaptive cancellation processing on the first digital signal through an adaptive filter to suppress a leakage interference signal component in the first digital signal, and generating a cancelled signal; wherein in the adaptive cancellation processing process, the digital processing unit adaptively updates the cancellation filtering weight of the adaptive filter according to the reference signal and the cancelled signal.
Owner:HUAHANG HI-TECH (BEIJING) TECH CO LTD

Radio frequency array multi-target spatial position accurate simulation method and system

The invention provides a radio frequency array multi-target spatial position accurate simulation method and system, and the method comprises the steps: a signal processing device generates a plurality of target signals, and after a radio frequency signal is generated through up-conversion, space-fed radiation is completed; the radio frequency array antenna receives a multi-target signal, transmits the multi-target signal to the electronic switch, and transmits the multiple target signals to different target feed channels respectively; multi-target signals are radiated in the same array antenna, four receiving antennas of signal processing equipment collect echo signals at the same time, the steps are repeated after a rotary table rotates by 180 degrees, and the inherent phase error of a receiving link of the system is calculated; according to the actual position of a target, a multi-target echo signal is formed through ternary combination, four receiving antennas of signal processing equipment collect the echo signal at the same time, and a signal phase is extracted; and calculating azimuth angle and pitch angle simulation errors of each target by using a phase comparison method in combination with the inherent phase difference of the system and the target position, and compensating the errors when three elements are combined into the target to realize accurate simulation of the multi-target spatial position.
Owner:SHANGHAI INST OF ELECTROMECHANICAL ENG

High-isolation full-duplex transceiver system and control method

The invention belongs to the technical field of full-duplex communication, and particularly discloses a high-isolation full-duplex transceiver system and a control method.The system comprises a transmitting module, a receiving module and a full-duplex baseband module, the transmitting module comprises a power amplifier module and a first oscillator, the power amplifier module is connected with the full-duplex baseband module, and the first oscillator is connected with the receiving module; an intermediate frequency signal transmitted by the full duplex baseband module enters the power amplifier module, is mixed with a signal with a frequency f4 generated by the first oscillator, and is up-converted to a frequency f3; the receiving module comprises a second oscillator and a low-noise amplifier module, the second oscillator is connected with the low-noise amplifier module, a receiving antenna of the receiving module receives the signal and inputs the signal into the low-noise amplifier module for frequency mixing with the signal of the second oscillator, the signal is down-converted to frequency f2, and the signal enters the full-duplex baseband module for data processing. By adopting the technical scheme, based on each module, the influence of self-interference leaked by a transmitting link on a receiving link is completely avoided, and the design complexity of any system is not increased.
Owner:全国海关信息中心广东分中心

Determining LO leakage and quadrature error parameters of an RF front end

The present disclosure provides a method and a system to estimate LO leakage and quadrature error parameters for a transmitter RF front end, such as a direct up-conversion transmitter RF front end, in a joint fashion. The proposed method utilizes a PN sequence inserted at the transmitter baseband. At the observation receiver side, an RX accumulator is implemented to sum receiver signals to take advantage of a despreading gain using the same PN sequence from transmitter side. Through the despreading process, the receiver-transmitter channel may be estimated and used to extract the quadrature error parameters. The estimated channel may also be used to eliminate user data interference presented within the RX accumulator output, which may further be used to compute the LO leakage.
Owner:ANALOG DEVICES INC

Baseband filter for current-mode signal path

One or more systems, devices and / or methods of use provided herein relate to a baseband filter that can be used in a current-mode end-to-end signal path. The current-mode end-to-end signal path can include a digital to analog converter (DAC) operating in current-mode and an upconverting mixer, operating in current-mode and operatively coupled to the DAC. In one or more embodiments, a device used in the signal path can comprise a baseband filter that receives an input current and outputs an output current. The baseband filter can comprise a feedback loop component having an active circuit branch and a passive circuit branch coupled in a loop. A mirroring device can be coupled to the feedback loop component and can provide an output of the device. Selectively activating the mirroring device can vary gain, such as of the mirroring device.
Owner:INTERNATIONAL BUSINESS MACHINE CORPORATION

Full-duplex Ka up-down conversion channel

The invention provides a full-duplex Ka up-down conversion channel which comprises a carrier plate, a Ka up-down conversion channel connected to the upper surface of the carrier plate, a Ka up-conversion channel, a frequency synthesizer circuit, a cavity filter, a high local oscillator dot frequency PDRO, a low local oscillator dot frequency PLS, a constant-temperature crystal oscillator connected to the lower surface of the carrier plate, a clock and a control circuit. The method is not limited to only complete a single function of up-conversion or down-conversion, can support simultaneous work of an up-conversion channel and a down-conversion channel of the same or similar frequency points while supporting multiple working modes and multi-channel work, can realize good spatial isolation, and avoids frequency crosstalk caused by simultaneous work of the similar frequency points; compared with an existing frequency conversion channel, two paths of high-stability clock signal channels are added, related reference clock signals can be provided for the outside, especially when the frequency conversion channel is applied to an information processor, matching of the frequency conversion channel serving as a radio frequency front end and other modules including a base band and a control module is more flexible, the integration degree is increased, and space is saved.
Owner:BEIJING RES INST OF TELEMETRY

Digital transmitter aliasing mirror image interference elimination device

The invention relates to the technical field of wireless communication, and discloses a high-efficiency low-cost aliasing mirror image interference elimination device for a digital transmitter. The device comprises a baseband signal processing module, a digital up-conversion module, an aliasing mirror image interference elimination module, a digital-to-analog conversion module and a transmitting module, the aliasing mirror image interference elimination module adopts a time domain compensation method, and an interference signal is compensated at a mirror image frequency point of a baseband signal; the mirror image problem generated by IQ mismatch and aliasing interference generated by mutual modulation between the digital high-frequency signal and the LO are eliminated at the same time. The device can complete IQ signal compensation by only needing two multiplications and one additive operation, has the characteristics of low implementation complexity and low cost, and can effectively improve EVM and ACLR performance of a transmitted signal.
Owner:HI TREND TECH SHANGHAI

Satellite communication system based on Beidou RDSS

The invention provides a satellite communication system based on Beidou RDSS. The satellite communication system specifically comprises a receiving channel and a transmitting channel. A receiving channel adopts a low-intermediate frequency structure, an antenna receives a radio frequency signal, the radio frequency signal is directly down-converted into a low-intermediate frequency signal through a mixer, and then the low-intermediate frequency signal is converted into a baseband signal through an analog-to-digital conversion chip. The system adopts a low-intermediate frequency structure and uses primary frequency mixing, so that compared with secondary frequency mixing of a superheterodyne structure, the system has the advantages of simple link, low cost, low power consumption, high integration and the like. Meanwhile, the system is down-converted to low-intermediate frequency, and low-intermediate frequency signals are far away from direct current, so that the problems of direct current offset, flicker noise and the like of the system are solved. A transmitting channel adopts a direct frequency conversion structure, and a baseband signal skips an intermediate frequency stage through a frequency mixer and is directly up-converted to a radio frequency signal transmitted by an antenna. The system not only ensures the advantages of simple link, low cost, low power consumption, high integration and the like of the system, but also improves the stray problem of signals transmitted by the system.
Owner:BEIJING AEROSPACE SCI & IND CENTURY SATELLITE TECH

Cognitive communication system and method based on ultra-wideband photon radio frequency transceiving

The cognitive communication system comprises a spectrum sensing unit, an intelligent cognitive communication decision module, a reconfigurable optical local oscillator generation module, a digital signal processing module, a cognitive communication receiving end and a cognitive communication transmitting end. The cognitive communication receiving end comprises a communication receiving radio frequency processing module, a photon radio frequency communication receiving module and a communication receiving intermediate frequency processing module; the cognitive communication transmitting end comprises a communication transmitting radio frequency processing module, a photon radio frequency communication transmitting module and a communication transmitting intermediate frequency processing module; the photon radio frequency communication receiving module converts a radio frequency signal into an optical carrier wave through optical carrier wave modulation, and down-converts the optical carrier wave into an intermediate frequency by using a reconfigurable optical local oscillator signal; the photon radio frequency communication transmitting module converts an intermediate frequency signal into an optical carrier through optical carrier modulation, and performs up-conversion to a radio frequency by using a reconfigurable optical local oscillator signal. According to the invention, through deep fusion of the photon technology and cognitive communication, the bandwidth, flexibility, anti-interference capability and dynamic reconstruction capability of the system are significantly improved.
Owner:CHINA ACADEMY OF SPACE TECHNOLOGY

High-precision navigation anti-interference module based on optical switch control

The invention belongs to the technical field of satellite navigation, and particularly relates to a high-precision navigation anti-interference module based on optical switch control, which comprises an antenna array unit used for receiving BDS B3 and BDS S frequency point navigation signals; the central independent oscillator is used for completing a function of transmitting BDS L frequency point signals; the optical switch chip control module is used for controlling signal receiving and transmitting; the low noise amplifier unit is used for amplifying and filtering the navigation signal; the anti-interference processing unit is used for completing anti-interference processing services of BDS B3 and RDSS S frequency points; the power supply and navigation unit is used for completing internal and external interface service processing, completing the functions of capturing, tracking, telegraph text decoding, PVT resolving and time service of satellite navigation signals of BDS B3 and BDS S frequency points, and completing the functions of modulation, up-conversion emission and emission enabling control of BDS L frequency points; and a communication port for communicating with an external device. According to the invention, three frequency point signals of BDS L, BDS B3 and BDS S can be supported at the same time, and the anti-interference performance is good.
Owner:GUANGXI XINYANG SPACE-TIME INFORMATION TECHNOLOGY CO LTD +1

SAR echo simulator with reconfigurable channel and method

The invention provides a channel reconfigurable SAR echo simulator and method, and relates to the technical field of spaceborne SAR and airborne SAR echo simulation testing, the simulator comprises a radio frequency down-conversion part, an ADC acquisition channel, a signal selection module, a baseband echo modulation channel, a signal convergence module, a DAC playing channel, a radio frequency up-conversion part and a parameter resolving part, the signal selection module and the signal convergence module can carry out transmission connection topology flexible configuration, so that a baseband echo modulation channel carries out echo generation of a corresponding mode according to the multi-channel requirement of SAR echo simulation, and the requirements of three modes are realized through a set of hardware, fixed computing resources and software configuration. Therefore, the technical problem that the echo simulation channel of the existing SAR echo simulator is relatively independent and can only meet the single application requirement can be solved.
Owner:CHANGGUANG SATELLITE TECH CO LTD

Straight wave and target echo simulation method for semi-active radar guidance introduction equipment

The invention relates to the technical field of avionics, in particular to a straight wave and target echo simulation method for semi-active radar guidance introduction equipment, which can realize generation of straight wave baseband signals and target echo signals in intermediate frequency and digital domains. The generation of a straight wave radio frequency signal, a target echo radio frequency signal or a broadband interference radio frequency signal is realized through digital-to-analog conversion and an up-conversion module, and finally the signals are radiated out through a microwave antenna; under a laboratory environment condition, a direct wave signal and a target echo signal can be provided for a semi-physical simulation experiment of radar equipment introduced by a semi-active guidance system, target echo and interference parameters are flexibly set, the method can be applied to the semi-physical simulation experiment of the equipment, the performance of the introduced equipment is comprehensively investigated, the limitation of local testing is avoided, and the test efficiency is improved. Meanwhile, compared with a real external field test, the cost consumption is greatly reduced.
Owner:STATE-OWNED LUOYANG DANCHENG RADIO FACTORY

Input switching circuit and wide-range direct current power supply device

The invention relates to the technical field of electronic circuits, and discloses an input switching circuit and a wide-range DC power supply device.The input switching circuit comprises a power supply input end, a power supply output end and a switching module, and the switching module is configured to switch the power supply input end to the power supply output end under the condition that the power supply voltage of a DC power supply is smaller than target voltage; the power input end and the power output end are communicated, so that the boost circuit performs boost conversion on the direct-current power supply, and target voltage is output; and when the power supply voltage of the direct-current power supply is greater than the target voltage, the step-down circuit performs step-down conversion on the direct-current power supply and outputs the target voltage, so that the power input end and the power output end are switched off according to the target voltage. Therefore, an external control signal is not needed, and the circuit can be automatically switched to a step-up or step-down working mode only based on input voltages in different ranges, so that the circuit can be applied to a power supply environment in a wide voltage range, and the applicability and the flexibility of the circuit are improved.
Owner:HANGZHOU KUNTAI MAGLEV TECH CO LTD

Lighting apparatus

A lighting apparatus includes a light source, a power module, a controller, a data input module, a serial-to-parallel converter module, an orthogonal frequency division multiplexing (OFDM) modulation module, a radio frequency (RF) upconversion module and an antenna module. The light source including multiple types of LED modules. The controller generates multiple driving currents supplied to the LED modules. The data input module is coupled to the controller. The data input module receives input data to be transmitted. The serial-to-parallel converter module converts the input data into multiple parallel data streams. The orthogonal frequency division multiplexing (OFDM) modulation module modulates the parallel data streams onto multiple orthogonal subcarriers. The antenna module includes multiple antennas configured to transmit RF signals corresponding to the multiple data streams.
Owner:LEEDARSON GREEN LIGHTING

Method and device for quickly generating high-resolution SAR deception jamming signal

The invention discloses a high-resolution SAR deception jamming signal rapid generation method and device, and belongs to the technical field of radar countermeasure. The method comprises the following steps: intercepting an SAR signal and measuring parameters of the SAR signal; obtaining a deception jamming template image, and carrying out edge optimization processing; performing two-dimensional partitioning on the template in the distance direction and the azimuth direction to obtain a plurality of sub-templates; calculating a phase compensation function for the central point of each sub-template, and carrying out phase optimization; the optimized sub-templates are superposed, and a high-quality product modulation matrix is generated; and multiplying the matrix by an intercepted SAR signal, and transmitting after digital-to-analog conversion and up-conversion to form a deception jamming signal. According to the method, through block phase compensation and template edge optimization, the imaging quality and concealment of the deception jamming image under the high-resolution SAR are remarkably improved, meanwhile, low calculation complexity is kept, and the method is suitable for satellite-borne and airborne SAR systems.
Owner:AEROSPACE INFORMATION RES INST CAS

Apparatus and methods for digital pre-distortion for a power amplifier

In one embodiment, an apparatus includes a baseband processor to generate a baseband signal and a digital pre-distortion (DPD) circuit to pre-distort the baseband signal with compensation information obtained from a lookup table. The lookup table may have a plurality of entries each to store a pre-distortion value, the lookup table to be addressed based on a target output power level of the baseband signal. The apparatus also may include a converter to convert the pre-distorted baseband signal to an analog signal and radio frequency (RF) circuitry comprising: a mixer to upconvert the analog signal to a pre-distorted RF signal, and a power amplifier to amplify the pre-distorted RF signal.
Owner:SILICON LABORATORIES INC

Signal pre-distortion processing method and device, electronic equipment and storage medium

The invention provides a signal pre-distortion processing method and device, electronic equipment and a storage medium, and relates to the technical field of communication, and the method comprises the steps: firstly carrying out the calculation of historical baseband data and historical baseband feedback data through a memory polynomial model, and obtaining a pre-distortion complex number coefficient group, then applying the predistortion complex coefficient group to a baseband signal to generate an in-phase component signal and a quadrature component signal containing amplitude and phase predistortion information, and then respectively carrying out carrier modulation on the in-phase component signal and the quadrature component signal to obtain an in-phase branch signal and a quadrature branch signal; and then calculating according to the in-phase branch signal and the orthogonal branch signal to obtain a pre-lost real signal, and finally carrying out carrier modulation on the pre-lost real signal to obtain an up-conversion signal. By implementing the technical scheme provided by the invention, the technical problem that phase pre-distortion information cannot be reserved in a signal pre-distortion process is solved.
Owner:BEIJING C&W ELECTRONICS GRP