7results about How to "Improve reception quality" patented technology

The application discloses a receiver direct current offset calibration method, equipment, a storage medium and a program product, relates to the field of radio frequency communication technology, and discloses a method, which comprises the following steps: detecting a direct current component in a signal received by a receiver through an analog-to-digital converter; determining a calibration mode according to a calibration method defined by a user; if the calibration mode is offline calibration, calculating a current compensation coefficient through a foreground calibration mode by using an adaptive algorithm, and if the calibration mode is online calibration, using a background calibration mode; obtaining a compensation signal after compensation of a direct current offset through a direct current offset signal and the current compensation coefficient; updating the compensation coefficient of a next clock cycle through an adaptive algorithm iteration coefficient and the compensation signal; determining a final compensation coefficient according to the iteration compensation coefficient of an internal counter of the adaptive algorithm, and outputting a calibration signal after calibration of the direct current offset. The application effectively reduces the system complexity through a compensation module and an adaptive algorithm to calibrate the direct current offset of the receiver and reduces the calibration time.

The application discloses a multi-mode full-frequency compatible 5G wireless router wireless transceiving control method and belongs to the technical field of router control, and specifically comprises the following steps: acquiring the working frequency band and local oscillator frequency of each radio transceiver module; calculating the frequency band overlapping length and frequency ratio of any two modules; marking the modules with the overlapping length greater than zero as a same-frequency interference module group and marking the modules with the same frequency ratio as a preset ratio as a local oscillator leakage module group; extracting the modules belonging to both groups, taking the local oscillator frequency of the modules as an index to find a frequency mapping table to obtain a clock division coefficient; adjusting the local oscillator frequency of the extracted modules according to the clock division coefficient; repeating the above steps until there is no module belonging to both groups, and outputting the final local oscillator frequency. The application realizes unified identification and iterative suppression of the composite interference of the same-frequency interference and the local oscillator leakage.

The application discloses an eye diagram data synchronization circuit and method and a serial-parallel converter receiving end, and belongs to the technical field of high-speed serial data communication; the circuit comprises: a calibration signal generation module for generating a phase calibration signal according to a phase difference between a data sampling signal and an offset sampling signal; two registers for respectively outputting the offset sampling signal and pre / post offset sampling signals; wherein the pre / post offset sampling signals are obtained by outputting the offset sampling signal in advance / delaying half a bit period; and a selection output module for selecting the offset sampling signal or the pre / post offset sampling signals as a synchronized offset sampling signal output according to the phase calibration signal, so that the synchronized offset sampling signal and the data sampling signal are in the same bit period. The application has wide application range, high synchronization precision and good dynamic performance.

The invention provides a circularly polarized antenna and Internet of Things equipment. The circularly polarized antenna comprises an antenna radiator, a feed wire, a first fixing structure and a second fixing structure. According to the circularly polarized antenna disclosed by the invention, the circularly polarized wave can be effectively generated through the frame body, the first branch knot and the second branch knot in the antenna radiator, so that the problem of polarization mismatch is reduced, and the signal receiving quality and the system communication efficiency are improved. The feed wire and the antenna radiator are matched with a proper projection coincidence area, and an air coupling feed mode is adopted to transmit energy to the antenna radiator, so that efficient signal transmission and excellent circular polarization characteristics of the circularly polarized antenna are realized. In addition, circularly polarized waves are realized through the structural design of the antenna radiator and the feed wire, so that the circularly polarized antenna is small in size, high in gain and easy to conform.

This invention belongs to the field of ultrasonic sensing and microelectromechanical systems (MEMS) packaging technology, specifically relating to a multi-segment acoustic packaging structure and optimization method for a PMUT ultrasonic transducer. The multi-segment acoustic packaging structure for a PMUT ultrasonic transducer includes a base, a PMUT chip, and an acoustic cavity. The acoustic cavity includes a front cavity section, a tapered transition section, a conduit section, and a waterproof and acoustically permeable membrane. A first minimum gap is formed between the radiating surface of the PMUT chip and the bottom surface of the front cavity section; a second minimum gap is formed between the waterproof and acoustically permeable membrane and the outlet end of the conduit section. Furthermore, the acoustic cavity serves as either a transmitter or a receiver. When used as a transmitter, the depth of the front cavity section is greater than that of the front cavity section when used as a receiver, and the inner diameter of the conduit section is smaller than that of the conduit section when used as a receiver. This packaging structure, through optimization of geometric parameters and acoustic characteristics, achieves differentiated performance improvements for the transmitter and receiver, increasing the transmitted sound pressure and directivity, and expanding the bandwidth and receiving angle of the receiver.

The utility model provides a kind of system level package chip of vehicle-mounted GNSS receiver, receiver and car, chip includes outer circle contact, inner circle contact and chip body;First, eleventh, twenty-third, twenty-fifth, twenty-seventh, thirtieth, thirty-second contact in outer circle contact, and fifth, eighteenth to twenty-fourth, twenty-eighth contact in inner circle contact, are all ground terminal;Fifth contact in outer circle contact and twenty-ninth contact in inner circle contact, are all first power supply terminal;Sixth contact and seventh contact are connected in outer circle contact, and seventh contact is second power supply terminal;Thirty-sixth contact and thirty-fifth contact are connected in outer circle contact, and thirty-fifth contact is third power supply terminal;Twenty-sixth, twenty-eighth, twenty-ninth and thirty-first contact in outer circle contact are four radio frequency input ports respectively;Fortieth contact in outer circle contact and first contact in inner circle contact are respectively communication interface for wired communication.

The invention provides a radar-based adaptive polarization filtering method and system, and relates to the technical field of radar signal processing. The method comprises the following steps: acquiring main channel discrete data and auxiliary channel discrete data; processing the main channel discrete data by a preset weight coefficient to obtain main channel polarization data; according to the auxiliary channel discrete data and the main channel polarization data, obtaining a cancellation weight coefficient of the auxiliary channel; and performing polarization cancellation on the main channel polarization data according to the cancellation weight coefficient of the auxiliary channel and the auxiliary channel discrete data to obtain cancelled main channel signal data. According to the method, weighting coefficients of two channels are calculated through orthogonal polarization channel signals, clutter interference of a main channel is suppressed in the mode that clutters in the main channel are offset through an auxiliary channel, and therefore the signal-to-noise ratio is increased, the receiving quality of useful signals is effectively improved, and then the target detection capacity is enhanced. In addition, the method has the advantages of automatically compensating the amplitude-phase unevenness between the channels and being easy in engineering implementation.