7 results about "Digital transmitter" patented technology

This invention provides a high-precision calibration system and method for a multi-channel ADC, relating to the field of communication technology. The system includes a digital transmitter, a DAC module, a calibration loop, and a multi-channel ADC module connected sequentially. It also includes a correlation module, a parameter estimation module, and a compensation module. The correlation module is connected to both the digital transmitter and the multi-channel ADC module. The parameter estimation module is connected to both the correlation module and the compensation module. The compensation module is also connected to the multi-channel ADC module. The calibration loop connects the end of the transmit link and the beginning of the receive link. This invention combines the analog and digital domains through the calibration loop, achieving deviation compensation by performing a single cross-correlation operation and parameter estimation on the local reference signal and multiple sub-signals. This method eliminates the need to redesign analog circuits and does not rely on external instruments for calibration. It features low hardware complexity, high stability, and a short estimation cycle, without affecting normal service operation.

Neuron circuits are provided for spiking neural network apparatus having multiple such neuron circuits interconnected by links, each associated with a respective weight, for transmission of signals between neuron circuits. A neuron circuit includes a digital transmitter for generating trigger signals, indicating a state of the neuron circuit, on outgoing links of the circuit. The state is encoded in a time interval defined by these trigger signals. The neuron circuit includes a digital receiver for detecting such trigger signals on incoming links of the circuit, and digital accumulator logic. In response to detecting a trigger signal on an incoming link, the digital accumulator logic is adapted to generate a weighted signal dependent on the time interval and to accumulate the weighted signals generated from trigger signals on the incoming links to determine the state of the neuron circuit.

The application discloses a multi-frequency reconfigurable all-digital transmitter chip, which comprises a multi-path baseband I / Q signal, a multi-frequency reconfigurable digital front-end processing module, a multi-frequency reconfigurable modulator module, a digital modulation output interface, a high-speed serial transmitter and a parameter configuration interface and control module; the multi-path baseband I / Q signal provides one or more paths of baseband I / Q data to be transmitted; the multi-frequency reconfigurable digital front-end processing module performs multi-phase interpolation and multi-phase up-conversion on the multi-path baseband I / Q data to form a multi-frequency composite digital signal; the multi-frequency reconfigurable modulator module is connected with the multi-frequency reconfigurable digital front-end processing module; the digital modulation output interface maps the multi-frequency digital modulation signal to a corresponding high-speed serial transmitter according to a transmission mode; the high-speed serial transmitter is connected with the digital modulation output interface to form a multi-frequency radio frequency signal; and the parameter configuration interface and control module are used for receiving external configuration data and controlling parameter configuration and starting timing of each module.

The application provides an IQ imbalance closed-loop calibration system and method, and relates to the technical field of communication.The system comprises a digital transmitter, a power amplifier, a low noise amplifier and a digital receiver connected in sequence, and further comprises a digital correlator, a solving unit, a phase controller and an IQ imbalance compensator.The power amplifier and the low noise amplifier are connected through a coupling loop.The application adjusts the analog phase and the digital phase of the loop through the phase controller, combines the four-time cross-correlation operation of the digital correlator and the parameter joint estimation of the solving unit, realizes the simultaneous calibration of the IQ imbalance in the digital transmitter and the digital receiver, does not need a phase-shifting module, realizes the phase switching by using the existing tuning capacitor of the power amplifier or the low noise amplifier, is simple in design, is close to the antenna port, is not easily affected by the internal radio frequency module in terms of interference and radiation, and is not easily affected in terms of calibration accuracy;the hardware implementation is easy, the complexity is low, the estimation accuracy is high, and the stability is strong.

A Code-Division Multiplexing radar system, comprises:a number NT transmitters, each configured to transmit a radar signal modulated by a unique code sequence, wherein one of the transmitters is configured to have a transmission power higher than the rest transmitters,a number NR receivers, each configured to receive a reflection signal caused by the transmitted radar signals, and reflected by a target, anda controller, configured to:generate a number N virtual receive elements, for each virtual receive element VXp,q:to detect the target,based on the detected target, to generate a reconstructed interference signal ũp,q caused by the radar signals transmitted by the other transmitters except for the qth radar signal, andto update a virtual receiving signal at said virtual receive element VXp,q based on the reconstructed interference signal x2.

The application discloses a near-space sounding instrument with a rope cutter and a data processing splicing method, and relates to the technical field of sounding instruments. The near-space sounding instrument comprises a parachute, a parachute rope, a sounding instrument and a rope cutter. The parachute is connected with the sounding instrument through the parachute rope. The sounding instrument comprises a shell, a lithium battery, a digital transmitter, an air pressure sensor, a data acquisition circuit, a high dynamic satellite navigation positioning module, a wireless remote control module, a mechanical switch and a temperature sensor which are arranged in the shell. The rope cutter is arranged in a cavity in the shell. The data processing splicing method comprises data analysis, quality control, correction and splicing processes. The near-space sounding data from the ground to a height of 60km can be generated. The sounding instrument can be quickly landed on the ground, the data acquisition rate is improved, and the data accuracy, consistency and integrity are ensured.