259 results about "Automatic gain control" patented technology

The invention discloses a 10kV medium-voltage power distribution network power line carrier communication method and system based on adaptive OFDM (Orthogonal Frequency Division Multiplexing), and the method comprises the steps that a master station sends a detection frame to a slave station, and the slave station carries out the CE (Channel Estimation), and obtains the CSI (Channel State Information); the method comprises the following steps of: dividing a broadband channel into a plurality of parallel orthogonal subcarriers, and dynamically allocating a modulation mode, a modulation order and a forward error correction (FEC) coding rate for each subcarrier of OFDM (Orthogonal Frequency Division Multiplexing) by adopting a water injection algorithm based on channel state information (CSI); adopting two-stage automatic gain control (AGC) to condition a signal received from a power line; and carrying out dynamic frequency hopping between a frequency band with serious interference and an idle frequency band based on a continuous spectrum sensing result. Compared with the prior art, through the multi-dimensional adaptive technology, the communication system can sense the channel state in real time and dynamically adjust the communication strategy, so that a stable communication link is established in a severe power grid environment.

The invention provides a cascade AGC (Automatic Gain Control) frequency modulation regulation control optimization method, which comprises the following steps: acquiring frequency deviation and tie line power deviation in a power system in real time, calculating a regional control error ACE based on the two deviations, and decomposing the ACE into a frequency deviation component and a tie line power deviation component; calculating a ratio coefficient of the frequency deviation component in the ACE and a ratio coefficient of the tie line power deviation component in the ACE; acquiring a climbing rate and an adjustable capacity of each frequency modulation unit, and performing normalization processing on the climbing rate and the adjustable capacity; calculating the rate-capacity double weight of each unit through a dynamic weight formula in combination with the ratio coefficient, the normalized climbing rate and the normalized adjustable capacity, and distributing frequency modulation power to each unit according to the normalized weight; in the operation process, on-line self-adaptive adjustment is carried out on dynamic weight calculation and unit adjustment related parameters according to system performance indexes.

A method and an apparatus for positioning-related reference signal transmission and reception, and a terminal are provided. The method for transmission includes the following. A positioning-related reference signal is transmitted in at least some of symbols between a first symbol and a second symbol in a target slot, where the first symbol is used for automatic gain control (AGC), and the second symbol is used for transmission / reception (Tx / Rx) switching.

A user device, UE, for a wireless communication network, like a 3rd Generation Partnership Project, 3GPP, network, is described. The UE is to communicate with one or more further UEs in the wireless communication network over a sidelink, SL. The UE is configured or preconfigured with a time slot structure allowing a transmission to be started at one of a plurality of starting symbols during a duration of a time slot, the plurality of starting symbols including a first starting symbol and a second starting symbol, the first starting symbol being an automatic gain control, AGC, symbol and the second starting symbol being an AGC symbol and being offset from the first starting symbol. The UE is to start a transmission at the first starting symbol or at the second starting symbol. When the UE starts the transmission at the first starting symbol, the UE is to include into the time slot an additional AGC symbol, the additional AGC symbol being at a symbol of the time slot corresponding the second starting symbol.

The invention discloses an energy storage cross-regional cooperation AGC optimization control method and equipment considering conditional SOC equalization, and the method comprises the steps: firstly evaluating the equivalent charge state and dynamic frequency modulation capability of an energy storage system in each region in real time, and judging whether a cross-regional cooperation condition is satisfied or not; if yes, a multi-objective optimization model is established, and the model takes a plurality of objective functions as optimization objectives, including enabling the equivalent state of charge to be balanced, minimizing inter-region tie line transmission power and maximizing the residual frequency modulation capability, and meanwhile, takes power grid operation parameters as constraint conditions. And by solving the model, obtaining an optimal output instruction of the energy storage system in each region in the next AGC control period, and issuing the optimal output instruction to the corresponding energy storage system for execution. The invention aims to support other regions through the tie line when the frequency modulation margin of the energy storage system in the interconnected region is sufficient, avoid frequency fluctuation caused by over-limit of the energy storage SOC and insufficient frequency modulation of a thermal power generating unit, improve the safety and reliability of energy storage frequency modulation, effectively stabilize the frequency fluctuation of a power grid, and enhance the anti-disturbance capability of a power system.

This disclosure describes systems, methods, and devices for secondary cell activation. A device may decode a medium access control (MAC) control element received from a network node, the MAC control element including a request to activate a secondary cell (SCell); perform receiver beam sweeping using a beam sweeping factor less than eight in a frequency range prior to activating the SCell, the receiver beam sweeping including: automatic gain control using the beam sweeping factor; and searching for the SCell using the beam sweeping factor; encode a reference signal received power (RSRP) report to be transmitted, the RSRP report including a synchronization signal block (SSB) prior to activating the SCell; perform a channel status information measurement prior to activating the SCell; encode a report indicative of the channel status information measurement to be transmitted prior to activating the SCell; and activate the SCell.

A demodulation circuit includes a slope detector circuit and a comparator circuit. The slope detector circuit is configured detect a change in the voltage and determine if the voltage rate of change meets or exceeds one of a rise threshold or a fall threshold. The comparator circuit is configured to set an upper limit and lower limit for rate of change, compare the voltage rate of change to the limits, determine that the voltage rate of change meets or exceeds the limits, if the voltage rate of change meets or exceeds the rising and falling rate of change limits, (v) set a lower limit for a falling rate of change, (vi) receive the voltage rate of change and determine that the voltage rate of change meets or exceeds the fall or rise threshold, if the voltage rate of change meets or exceeds the falling or rising rate of change.

The invention relates to the technical field of new energy power generation control, and discloses a frequency modulation control and online monitoring system, which comprises an AGC (Automatic Gain Control) system for realizing automatic gain control to stabilize the signal transmission quality of the system, and an FPGA (Field Programmable Gate Array) functional module for high-speed data acquisition and logical operation processing, and the CPU processing module is used for overall planning of data analysis, instruction generation and system cooperative control. According to the invention, the FPGA + CPU hardware architecture is adopted, so that the precision requirement of power grid frequency sampling can be ensured, and the precision of the calculated grid-connected point power information can be ensured, thereby obtaining the high-precision power adjusting quantity, adjusting the new energy station according to the power adjusting quantity, and carrying out real-time adjustment control on the new energy station. The requirement for primary frequency modulation of the new energy station is met, and the operation stability of the new energy station is effectively improved.

The invention provides an unmanned aerial vehicle electromagnetic interference positioning method and system, and relates to the technical field of unmanned aerial vehicles, and the method comprises the steps: 1, carrying out the broadband frequency spectrum scanning of a remote control link frequency band, a telemetering link frequency band and an image transmission frequency band at the full flight stage of an unmanned aerial vehicle, detecting an interference signal in a frequency hopping communication system in real time, and transmitting the interference signal to an unmanned aerial vehicle; identifying random hopping frequency conversion points covered by the interference signals to form a hopping frequency conversion point set; and step 2, inputting the hopping frequency point set into a radio frequency sharing front end, coupling a radio frequency signal of a communication antenna to a spectrum analysis unit through a duplexer, and performing signal compensation on a coupling path by utilizing automatic gain control and a phase equalizer to obtain corrected interference spectrum data. The anti-interference capability and the flight safety of the unmanned aerial vehicle in a complex electromagnetic environment are improved, and the avoidance path is generated to guarantee the safe flight of the unmanned aerial vehicle.

Aspects of the disclosure relate to an audio hub that may be connected to a computing device. The audio hub may comprise multiple wired and wireless communication interfaces that may be used to interface multiple peripheral audio devices with the computing device. The audio hub may comprise a built-in reference microphone that may be used for noise cancelation, automatic gain control, and / or acoustic echo cancelation. The audio hub may additionally be configured for audio dosimetry measurements based on output audio signals as sent to an audio output device connected to the audio hub.

Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) transmits a subset of symbols of a set of symbols of a sidelink positioning reference signal (SL-PRS) resource, and transmits the set of symbols of the SL-PRS resource, including the subset of symbols, wherein the set of symbols is transmitted after the subset of symbols.

The invention provides a thermal runaway early warning and grading suppression method and system for a lithium iron phosphate energy storage battery for AGC frequency modulation of a 300MW and above thermal power generating unit. The method comprises the following steps: acquiring four-dimensional parameters including battery cell temperature, characteristic gas concentration, battery cell voltage and internal resistance and battery cabin vibration amplitude; performing graded early warning on the lithium iron phosphate energy storage battery based on the four-dimensional parameter to obtain an early warning signal; sending the early warning signal to a DCS (Distributed Control System) and an AGC (Automatic Gain Control) system of the thermal power generating unit so as to share the risk level and the battery module positioning information; matching and executing a corresponding hierarchical suppression strategy based on the early warning signal; and based on the shared risk level and the battery module positioning information, linkage suppression is carried out through a DCS system and an AGC system of the thermal power generating unit. According to the method, the four-dimensional parameters are obtained for graded early warning, the graded suppression strategy is matched, linkage suppression is carried out with the DCS and AGC system of the thermal power generating unit, and the thermal runaway risk is effectively prevented and controlled.

Various aspects of the present disclosure generally relate to wireless communication. Some aspects relate to a configurable automatic gain control (AGC) procedure for sidelink communications. A receiving device, a transmitting device, and / or a network node may determine whether AGC training is to be performed for sidelink communications. For example, the receiving device, the transmitting device, and / or the network node may determine whether resources dedicated to the AGC procedure may be used for communicating other information, such as data and / or control information. The receiving device, the transmitting device, and / or the network node may identify an AGC configuration for whether an AGC resource, of a set of resources for communicating one or more signals, includes an AGC message for performing the AGC procedure. The transmitting device and / or the receiving device may communicate the AGC message, the data message, and / or the control message via the AGC resource in accordance with the AGC configuration.

The invention discloses a transformer oil gas real-time monitoring method and device by combining a negative curvature optical fiber with a Raman spectrum. The transformer oil gas real-time monitoring device comprises an optical fiber transmission module, an optical detection module and a multi-degree-of-freedom adjusting mechanism, the optical fiber transmission module comprises a negative curvature optical fiber with a side hole, an optical fiber connector and an optical fiber protection sleeve, and efficient signal transmission is achieved. The optical detection module comprises a light splitting unit, a signal receiving unit and a signal processing unit, and is provided with an automatic gain control unit electrically connected with the signal receiving unit; the multi-degree-of-freedom adjusting mechanism comprises a rotating platform, a pitching support and a telescopic arm, and signal collection is optimized by adjusting the angle and the position. And an integrated interface unit is arranged between the optical fiber transmission module and the optical detection module. The signal transmission efficiency is improved through the negative curvature optical fiber, the system stability is enhanced through automatic gain control and temperature compensation, the type and concentration of gas dissolved in transformer oil are accurately analyzed, and the efficient real-time monitoring requirement of an electric power system is met.

The invention discloses an optical interconnection simulation method and system based on full-link parameter optimization, and the method comprises the steps: processing an original signal based on a coding module, a first feed-forward equalizer and a continuous-time linear equalizer, and obtaining a to-be-processed electric signal; modulating and converting the to-be-processed electric signal into a to-be-sent optical signal through a driving circuit, and sending the to-be-sent optical signal through an optical channel; sensing a to-be-sent optical signal through a photodiode to obtain a to-be-received electric signal, and processing the to-be-received electric signal through a trans-impedance amplifier to obtain a to-be-recovered electric signal; and processing the electric signal to be recovered through an automatic gain control continuous time linear equalizer, a decision feedback equalizer and a second feed-forward equalizer to obtain a target receiving signal corresponding to the original signal. The problem of collaborative optimization of electric-optical-electric link distortion compensation and noise suppression in the high-speed optical interconnection system is solved, and the simulation precision is improved to the transmission scene verification requirement of single wave 200Gbps (the data rate of transmitting 200gigabit bit per second) or above.

The invention relates to the technical field of channelized receiver management, in particular to a dynamic range channelized receiver method and system based on a block floating point and AGC (Automatic Gain Control), in the system, an automatic gain control module is used for detecting the power of an obtained intermediate frequency analog signal, generating an AGC voltage corresponding to the intermediate frequency analog signal and feeding back the AGC voltage to an analog front end; and dynamically updating the gain of the variable gain amplifier in the radio frequency signal preprocessing process. According to the invention, each channel has independent block floating point gain control, and the channels do not interfere with each other, so that parallel signal-to-noise ratio processing is realized; meanwhile, a complete gain control history is constructed by jointly recording the AGC gain and block floating point processing, data support is provided for recovering the original absolute power value of the signal in each channel, and the contradiction between gain control and information reservation is solved to a certain extent.

The utility model discloses a high-density deployment noise monitoring micro-station in the technical field of noise monitoring, which comprises a capacitive sensor, a preamplifier, an ADC (analog to digital converter) circuit, an AGC (automatic gain control) circuit, an MCU (microprogrammed control unit) system and a wireless communication module. The pre-amplifier is used for amplifying an analog signal according to a certain multiple, the ADC circuit is used for the analog-to-digital conversion circuit and converting an analog electric signal into a digital electric signal, the AGC control circuit is used for the automatic gain control circuit, and the MCU system is used for processing, operating and storing received data and controlling an AGC amplification multiple and a communication mode. The wireless communication module is used for transmitting data processed by the micro-station MCU system through a long-distance wireless communication technology or receiving external data, low power consumption and miniaturization of the noise monitoring station are achieved through combination of all aspects, the noise monitoring station can be conveniently installed on any fixable places such as a wall, a trunk and an electric pile, and high-density deployment is achieved.

A control method of an optical transceiver having a transmission port, a reception port, and a light source for transmission and reception of an optical signal, includes: determining whether a state of a connection of a transmission path to the reception port is a loopback connection from the transmission port; and switching a control of a gain of the reception from an automatic gain control (AGC) to a fixed gain when determining the state of the connection to be the loopback connection.

The invention discloses an automatic gain control circuit, an automatic gain control method and communication equipment. The automatic gain control circuit comprises a first gain module and a receiving control module, the receiving control module comprises an attenuation unit and an acquisition unit, the first gain module is used for receiving an input signal, and the first gain module, the attenuation unit and the acquisition unit are connected in sequence; the first gain module is configured to reduce the gain when the attenuation amount of the attenuation unit reaches a preset attenuation threshold value and the signal intensity of the input signal is greater than the preset intensity of the acquisition unit; and the attenuation unit is configured to attenuate the signal intensity of the input signal step by step when the signal intensity of the input signal after gain is greater than the preset intensity of the acquisition unit. By adopting the scheme, the linearity of the circuit is improved, and the circuit cost is reduced.

The application discloses an enhanced three-point UHF RFID system based on AGC and an automatic gain control method, and relates to the technical field of RFID systems. The system comprises a host computer, a reader-writer, a plurality of exciters and a plurality of tags. The host computer sends control information to the reader-writer in a wired mode. After receiving the information from the host computer, the reader-writer sends a networking command to activate the exciters, and then sends an inventory command to the exciters. After the exciters and the reader-writer are successfully networked, the inventory command is forwarded to the tags. After receiving the inventory command, the tags return response information to the reader-writer. After receiving and processing the tag return information, the reader-writer sends the information to the host computer. The method considers the nonlinearity of a power detection circuit, calibrates output power, makes feedback input more accurate, considers the timing problem between the reader-writer and the tags, solves the influence caused by modulation power fluctuation, improves the receiving sensitivity of the reader-writer, and solves the problems of low gain and poor dynamic range existing in the prior three-point UHF RFID system.

The invention relates to the field of feedback type automatic gain control circuits, and discloses a fully differential peak detection AGC circuit, which comprises a multi-stage variable gain amplifier, a buffer amplifier group, a first comparator EA1, a fully differential peak detection unit and an external port, the external port comprises a power supply end VDD, a ground end GND, a negative signal input end INN, a positive signal input end INP, a positive signal output end VON, a negative signal output end VOP, a plurality of bias ports and a reference voltage end VREF; according to the full-differential peak detection circuit, the full-differential structural design is adopted, common-mode noise and external interference can be effectively restrained, the full-differential peak detection unit alternately discharges the capacitor C11 through the first NMOS tube NM1 and the second NMOS tube NM2, continuous discharge adjustment of the capacitor C11 is achieved, the problem that discharge of the capacitor is interrupted in traditional peak detection is avoided, the loop response speed and the gain adjustment precision are improved, and the detection precision of the full-differential peak detection circuit is improved. Even if one path of the differential signals is temporarily lost, the other path of the differential signals can still drive the peak detection unit and the feedback loop to work, and the reliability is improved.

The invention provides an automatic gain control radio frequency receiving circuit and electronic equipment, a first end of a first switch of the radio frequency receiving circuit is connected with a radio frequency receiving line, a second end of the first switch is connected with a first end of a second switch, and a third end of the first switch is connected with a frequency reduction processing circuit. A signal received by the radio frequency receiving line is input into the second switch or the frequency reduction processing circuit through the first switch; the second end of the second switch is connected with the frequency reduction processing circuit, the third end of the second switch is connected with the first end of the radio frequency detection circuit, the second end of the radio frequency detection circuit is connected with the first end of the adjustable attenuator, the second end of the adjustable attenuator is connected with the radio frequency transceiver circuit, and the third end of the radio frequency detection circuit is connected with the radio frequency transceiver circuit. According to the scheme, wide-frequency-band coverage of a radio frequency receiving link, real-time processing of large-bandwidth signals, high-dynamic-range adjustment and real-time processing of violent fluctuation of received signal power can be achieved.

A method and apparatus for automatic gain control (AGC). A transceiver includes an analog-to-digital converter (ADC) configured to convert a received analog signal to digital signal, a measurement circuitry configured to measure a signal level on the digital signal, an AGC controller configured to generate, based on the measured signal level, an analog gain control signal to change a gain to be applied to a received analog signal in analog domain and a digital gain control signal for digital gain compensation corresponding to the gain change in analog domain, and a digital gain compensation circuitry configured to apply the digital gain compensation based on the digital gain control signal. The digital compensation gain applied to the digital bits follows a ramp profile that is an inverse of a transient response to the gain change in analog domain.

A self-controlled equalization circuit includes a first amplifier, a second amplifier, a feedback signal generator, a frequency delay signal generator, a feedback enabling unit, an equalization control unit, and a gain control unit. The first amplifier includes a first input terminal and a second input terminal. The second amplifier is coupled to the first amplifier. The feedback signal generator is coupled to the second amplifier. The frequency delay signal generator is used for receiving a frequency signal. The feedback enabling unit is coupled to the output terminal of the frequency delay signal generator and the feedback signal generator. The equalization control unit is coupled to the feedback signal generator, the feedback enabling unit, and the first amplifier. The gain control unit is coupled to the feedback signal generator, the second input terminal of the first amplifier, and output terminals of the first amplifier.

The present application provides a communication method, device and system. The method comprises: receiving first information, the first information being used for indicating a first isolation degree and / or a first threshold value, the first isolation degree being an isolation degree between a first port and a second port, and the first threshold value being related to a start-up control value of analog automatic gain control (AAGC); sending second information, the second information being used for instructing to attenuate a second signal; receiving the attenuated second signal; and performing sensing processing on the basis of the attenuated second signal. In the technical solution, an REC instructs an RE to attenuate signals received in a time period when an antenna receiving and transmitting array surface works simultaneously, so that the impacts of the same-frequency interference generated by the leakage of a transmitting signal on a receiving end can be reduced, thereby improving the quality of sensing and subsequent communication.

The application discloses a kind of digital frequency tracking and synchronous sampling control system for resonant gyro, including self-excitation oscillation and automatic gain control device, preamplifier circuit and digital signal processor, digital signal processor includes first A / D conversion unit, second A / D conversion unit, frequency error detection unit FD, phase error detection unit PD, digital control oscillator NCO, sampling frequency generator and quadrature demodulation unit, the vibration signal of drive channel is handled after device output to first A / D conversion unit, conversion obtains the vibration signal after conversion, FD obtains frequency difference by frequency error detection, PD obtains phase difference by phase error detection, NCO is adjusted the frequency and phase of sampling frequency generator according to frequency difference and phase difference in real time, until the resonant frequency and phase of drive channel are tracked;The vibration signal of detection channel is handled after circuit output to second A / D conversion unit, obtains the vibration signal after conversion, and quadrature demodulation unit carries out quadrature demodulation and obtains speed signal.

A variable gain amplifier and an automatic gain control circuit including the same are provided. The variable gain amplifier includes a gain amplification circuit configured to output an amplified signal by amplifying an input signal according to an amplifier control voltage, and a gain control circuit configured to determine the gain control voltage based on gain indication information from outside the variable gain amplifier, wherein the gain control voltage includes a fixed control voltage component based on a ratio of circuit element parameters and a variable control voltage component adjusted by the gain indication information, convert the gain control voltage into an exponential control voltage having an exponential relationship with the gain control voltage, and amplify and filter the exponential control voltage to obtain the amplifier control voltage to control a gain of the gain amplification circuit.

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a receiving (Rx) user equipment (UE) may receive an automatic gain control (AGC) allocation configuration for a first AGC allocation. The Rx may receive one or more of an AGC allocation activation signal or an AGC allocation indication, the AGC allocation activation signal being associated with a second AGC allocation, and the AGC allocation indication being associated with a third AGC allocation for the transport block. Numerous other aspects are described.

The utility model belongs to the technical field of unmanned aerial vehicle obstacle avoidance radars, and particularly discloses an anti-interference control circuit for unmanned aerial vehicle obstacle avoidance radar communication, which comprises a filtering module used for filtering signals outside a working frequency band and interference signals; the amplification module is used for amplifying the received weak signal; according to the utility model, the filtering module is used for filtering out signals and interference signals outside a working frequency band, the amplification module is used for amplifying the received weak signals, and the detection module can help to identify and separate useful signal components so as to enhance the anti-interference capability of the unmanned aerial vehicle. The frequency mixing module avoids an interference frequency band by changing the frequency of the signal, and the unmanned aerial vehicle adapts to interference signals with different intensities through the automatic gain control module, so that the signal can be correctly received and processed under strong interference, and the anti-interference capability of the unmanned aerial vehicle is effectively improved.

The invention provides a PAM4 signal equalizer based on automatic gain control, which comprises a continuous time linear equalizer CTLE, a variable gain amplifier VGA, a negative capacitor I, a negative capacitor II, a power detector, an encoder, an eye diagram parameter calculation module, a digital time converter, a pipelined analog-to-digital converter and a counter, the first input end of the continuous time linear equalizer CTLE is connected to an input signal DIN, the second input end VCTLE1 of the continuous time linear equalizer CTLE is connected to the first output end of the encoder, the third input end VCTLE2 of the continuous time linear equalizer CTLE is connected to the second output end of the encoder, and the output end N1 of the continuous time linear equalizer CTLE is connected to the input end of the first negative capacitor and the first input end of the VGA. According to the invention, optimization and real-time adaptive adjustment for PAM4 characteristics can be realized, the adaptability and the anti-noise capability can be improved, and the signal recovery capability and the signal integrity can be improved.