16 results about "Pair gain" patented technology

Accordingly, there are disclosed herein receivers and receiving methods that provide a graceful transition from PAM2 to PAM4 signaling. One illustrative method includes: negotiating a link speed having PAM4 signaling; performing adaption of at least one gain or filter coefficient during PAM2 signaling; switching to PAM4 detection before receiving PAM4 signaling; disabling said adaptation before said switching to PAM4 detection; detecting PAM4 signaling using at least one statistic of detected PAM4 symbols; and enabling said adaptation after PAM4 signaling is detected. Another illustrative method includes: negotiating a link speed having PAM4 signaling; adapting at least one of gain and filter coefficients during PAM2 signaling; monitoring for a change in at least one signal characteristic while performing PAM2 detection; and transitioning to PAM4 detection after detecting said change.

The invention discloses a self-adaptive CTLE gain adjustment method and system in a high-speed digital transmission system, relates to the technical field of equalizers of high-speed digital signal transmission systems, and realizes self-adaptive adjustment of CTLE by dividing a state interval of a first tap coefficient of a DFE and analyzing a transfer trend of the state interval. The method specifically comprises the following steps: dividing a first tap coefficient of the DFE into four states according to three set boundary reference lines; sampling a first tap coefficient of the DFE in a signal processing period and recording a current state of the first tap coefficient; and judging the validity of the state transition by checking the consistency of the previous two states, if the state transition is valid, determining a gain adjustment strategy according to the state transition condition, and adjusting the CTLE gain according to the gain adjustment strategy, otherwise, maintaining the current gain. According to the invention, through interval dynamic feedback of the first tap coefficient of the DFE, stable convergence of the CTLE gain is realized, and intersymbol interference and noise influence are effectively suppressed.

The invention belongs to the technical field of communication, and particularly relates to a radio frequency front-end module of a broadband parallel receiving system and a signal receiving method.The radio frequency front-end module comprises a front-stage processing module, an intermediate-stage processing module and a rear-stage processing module which are connected in sequence, the front-stage processing module, the middle-stage processing module and the rear-stage processing module are all connected with the power supply management module; the pre-stage processing module is used for receiving a radio frequency signal and carrying out amplification and shunt processing on the radio frequency signal; the intermediate processing module is used for providing a frequency division parallel path and completing shunt processing; and the post-stage processing module is used for merging and amplifying the analog signals subjected to shunt processing, dynamically monitoring and controlling gains and controlling differentiation processing of the analog signals, and the signal receiving method is based on the radio frequency front-end module. The antenna is applied to a wireless parallel receiving communication system in a complex electromagnetic environment, and has the advantages of wide frequency band, high response speed, large receiving dynamic range and the like.

The invention belongs to the technical field of electronic power, and discloses a fan control method based on a feed-forward compensation decoupling controller and related equipment. The draught fan control method based on the feed-forward compensation decoupling controller comprises the steps that the coupling relation between input and output of all channels in a draught fan control system is confirmed through a relative gain matrix analysis method, a feed-forward compensation decoupler is obtained based on the coupling relation, and the feed-forward compensation decoupler is applied to the draught fan control system. Performing decoupling processing on the input of each channel; the rotating speed of the draught fan can be accurately controlled through decoupling, the noise reduction effect is achieved, and meanwhile the heat dissipation requirement of the whole machine is met.

The invention relates to the technical field of communication, in particular to a multi-band subcarrier gain adjustable repeater and a multi-band subcarrier gain method, and the repeater comprises an analog-to-digital converter, an FPGA and a digital-to-analog converter which are connected in sequence; wherein the FPGA is configured to decompose a digital signal received from the analog-to-digital converter into multiple paths of sub-signals, perform gain adjustment on each path of sub-signals, and combine the multiple paths of sub-signals after gain adjustment to obtain a multi-carrier gain adjustment signal; and sending the multi-carrier gain adjustment signal to the digital-to-analog converter, so that the digital-to-analog converter converts the multi-carrier gain adjustment signal into an analog signal. According to the scheme provided by the invention, the gain of each sub-band is adjusted as required according to the input signal strength of each sub-band and the output power requirement of the whole band, so that the output power of different sub-bands is ensured to be consistent, and the signal coverage of the repeater on different sub-bands is ensured to be the same.

The invention discloses a circuit and a method for performing automatic gain control based on wireless communication basic frame power detection. An input signal enters the adjustable digital attenuator DSA after passing through the low-noise amplifier, and the signal adjusted by the DSA enters the ADC for sampling at a proper amplitude, is converted into a digital signal, and then is sent to the rear-stage FPGA for data processing. And the FPGA performs digital power statistics on the input signal according to wireless frame timing, and compares the signal power obtained by statistics with a set threshold. A gain control threshold is designed into a high gear and a low gear, and a gain adjusting speed is also designed into a high gear and a low gear. The digital power of the received signal is compared with a two-stage threshold to determine whether to use fast attenuation or slow attenuation. By means of the method, the attenuation value of the external DSA is accurately controlled, ADC saturation of the input signal can be avoided, meanwhile, it is guaranteed that the amplitude change of the input signal is smoother to the maximum extent, and the signal quality is improved.

This invention discloses an adaptive CTLE gain adjustment method and system in a high-speed digital transmission system, relating to the field of equalizer technology for high-speed digital signal transmission systems. This invention achieves adaptive CTLE adjustment by dividing the state interval of the first tap coefficient of the digital signal equalizer (DFE) and analyzing its transition trend. Specifically, it includes: dividing the first tap coefficient of the DFE into four states according to three set boundary reference lines; sampling the first tap coefficient of the DFE during the signal processing cycle and recording its current state; determining the validity of the state transition by verifying the consistency of the first two states; if valid, determining the gain adjustment strategy based on the state transition, and adjusting the CTLE gain according to the gain adjustment strategy; otherwise, maintaining the current gain. This invention achieves stable convergence of the CTLE gain through interval dynamic feedback of the first tap coefficient of the DFE, effectively suppressing inter-symbol interference and noise effects.

The application discloses a method and device for adjusting automatic gain control of a receiver. The method comprises the following steps: setting a gain comparison value; collecting an indication signal of a peak value detector according to a sampling time interval; comparing a gain value of a receiving channel with the gain comparison value when the indication signal is in a non-locking interval; and adjusting the gain value of the receiving channel according to a comparison result. The application can set different gain comparison values and sampling time intervals, can adjust the range of gain control, and can also adjust the adjustment speed of gain control.

The utility model discloses a dual-channel signal circuit of a Beidou system. The dual-channel signal circuit comprises an antenna matching network, a power amplifier, a filter and a positioning chip processor, the antenna matching network is connected with a two-in-one external antenna, and the two-in-one external antenna is used for jointly accessing a B1 signal and a B2 signal to a radio frequency input end of the antenna matching network; the input end of the power amplifier is connected with an antenna matching network, and the power amplifier U2 is used for performing gain amplification on accessed B1 and B2 signals; the filter is connected with the power amplifier and is used for filtering the signals B1 and B2 after gain amplification respectively; the high-level output end of the filter is connected with the B1 matching network; and the low-level output end of the filter is connected with the B2 matching network. And the positioning chip processor is respectively connected with the B1 matching network and the B2 matching network and is used for accessing a B1 signal and a B2 signal. According to the utility model, the overall equipment cost of the circuit can be reduced while the requirement of dual-channel signal input is met.

The invention discloses an ADC time domain error background calibration method and system based on digital output statistics. The system comprises a digital signal monitoring module, a gain error calibration module and a hierarchical offset error calibration module. The front end and the rear end of the ADC are connected, and digital signals are monitored in real time, so that the digital signals output by the front end stage and the rear end stage are obtained; extracting a gain error direction of a voltage-time converter (VTC) and adjusting the gain error direction by using a similarity relationship between a saturation state of a rear-end ADC and front and rear-end MSBs; constructing a hierarchical imbalance calibration loop, and carrying out decoupling calibration on the inherent imbalance of the VTC and the imbalance of each path of the TDC; on the premise of no interruption and low overhead, simultaneous, real-time and high-robustness calibration is carried out on the gain error and the multi-source offset error; belongs to the technical field of mixed signal integrated circuits.

The invention relates to the technical field of wireless communication, and discloses a method, a device, equipment and a medium for gain calibration, which are applied to a radar cross section active calibration device, and the method comprises the following steps: obtaining an output signal of initial temperature and preset power in the radar cross section active calibration device, performing up-conversion gain, attenuation, down-conversion gain and signal processing board module acquisition processing on the output signal, and determining first power of the acquired and processed signal; comparing the preset power with the first power, and determining a gain calibration coefficient at the initial temperature based on a comparison result; and adjusting the temperature in the radar cross section active calibration device to be the initial temperature, controlling the gain of the signal processing board based on the gain calibration coefficient, and performing gain calibration. Based on the gain calibration coefficient, gain control of the radar cross section active calibration device in the normal working mode is carried out, the system gain precision in actual work can be greatly improved, and meanwhile the influence of the temperature on the gain precision and the gain stability can be reduced.

This invention belongs to the field of communication technology, specifically a method for gain control of burst signal reception. First, it synchronously captures burst signal time-domain data and timing parameters, separates multipath components and extracts features, classifies environmental interference information, and finally fuses the time-domain, multipath, and interference data into a dataset, providing complete and multi-dimensional raw data support for subsequent signal feature analysis and gain decision-making. Then, based on the multi-dimensional acquired data, it calculates the dynamic range of signal amplitude to determine saturation risk, assesses the signal quality of multipath components to select effective components, quantifies the impact of interference on gain, and sorts gain requirements according to anti-saturation, multipath adaptation, and interference compensation, clarifying the core direction for hierarchical parameter decision-making. Based on this, this invention, through an optimized multi-dimensional acquisition and rapid feature analysis process, can significantly shorten the response cycle of gain adjustment, avoiding the loss of burst signals due to untimely adjustment.

The invention relates to the technical field of wireless communication, in particular to a quadrature modulation calibration method. The method comprises the following steps: constructing a non-ideal IQ modulator mathematical model; according to the useful signal and the useless signal, constructing a power difference between a difference component of the frequency of the local oscillator signal and the baseband signal and a sum component of the frequency of the local oscillator signal and the baseband signal; performing parameter fitting on sideband suppression, and recording corresponding sideband suppression output into a set; constructing an optimization model; dC offset error calibration is converted into gain vector origin positioning based on a maximum equal gain circle, gain setting vector representation of an ideal IQ modulator is constructed, and the relation between useless signal energy and input baseband signals and DC offset is obtained; and determining a voltage boundary, testing a gain circle, and constructing a model objective function to obtain an optimal direct current offset error. According to the invention, the influence of amplitude and phase mismatch can be effectively reduced, and local oscillator leakage is suppressed, so that the output signal quality of the signal source is improved, and the requirement of a high-performance communication system is met.

The invention discloses a digital automatic gain control method suitable for a private network, a storage medium and a device, and the method comprises the following steps: setting a gain response smoothing factor and an initial gain, and initializing the gain to be adjusted; windowing the whole signal, sliding the window, and extracting a signal in the window as a current signal; performing gain smoothing; the current signal amplitude is calculated, and overflow statistics and power adjustment are carried out; calculating the total signal power, averaging to obtain the current gain, and calculating the gain needing to be updated; and the gain to be adjusted is updated, and signal processing in the next window is carried out based on the updated result until the whole signal processing is completed. According to the invention, gain smoothing processing is carried out on the window signal, feedback adjustment is carried out on parameters in the gain smoothing processing process by calculating the difference between the current gain and the target gain, automatic gain control on the next window signal is realized, and a good gain control effect can be achieved.

Methods, systems, and devices for wireless communications are described. The described techniques may enable a user equipment (UE) to allocate bits of a phase quantization based on a relative gain increase of each of a set of amplitude values. For example, the UE may identify a gain matrix that defines a gain associated with allocating quantities of bits to each amplitude value. The UE may accordingly determine, for each bit of the phase quantization, a respective amplitude value to which the UE may allocate the bit. In some examples, the UE may be configured with multiple gain matrices associated with gain increases for multiple respective noise and source distributions. The UE may therefore select the gain matrix from the multiple configured gain matrices based on one or more noise measurements of the channel.

Accordingly, disclosed herein are receivers and receiving methods that provide superior conversion from PAM2 to PAM4 signaling. One illustrative method includes negotiating a link speed with PAM4 signaling, performing adaptation of at least one of a gain or a filter coefficient during PAM2 signaling, switching to PAM4 detection prior to receiving PAM4 signaling, disabling the adaptation prior to the switching to PAM4 detection, detecting PAM4 signaling using at least one statistic of detected PAM4 symbols, and enabling the adaptation after detecting PAM4 signaling. Another illustrative method includes negotiating a link speed with PAM4 signaling, adapting at least one of a gain and a filter coefficient during PAM2 signaling, monitoring for a change in at least one signal characteristic while performing PAM2 detection, and transitioning to PAM4 detection after detecting the change.