30results about How to "Troubleshoot reception issues" patented technology

The invention provides a sending method of downlink control information. A base station transmits public information or user proprietary information to user equipment through a physical downlink shared channel (PDSCH), indication is conducted through the downlink control information (DCI) which is carried by a control channel, and the bandwidth which is occupied by the PDSCH is smaller than a system bandwidth. The invention further provides the base station.

The invention provides a sending method of downlink control information. The sending method includes the steps of directly transmitting public information to user equipment by a base station through a physical downlink shared channel (PDSCH) through the adoption of a sending diversity transmission mode. The invention further provides a detecting method of the downlink control information. The detecting method includes the steps of detecting the PDSCH which carries the public information through the user equipment in a blind mode, and obtaining the public information. The invention further provides user equipment and a base station. According to the sending method and the detecting method of the downlink control information, the base station and the user equipment, control information expenses are saved.

The invention provides a Bluetooth antenna array in a Bluetooth antenna device, wherein the Bluetooth antenna array has more than four Bluetooth antennas linearly arranged at an equal distance, and the distance between two adjacent Bluetooth antenna single feed points is not larger than a Bluetooth wavelength. The present invention also proposes a set of Bluetooth positioning system which includes a Bluetooth transmitting module and a Bluetooth receiving module. After receiving a Bluetooth signal, the Bluetooth antenna array of the Bluetooth receiving module measures and calculates the position parameter of the Bluetooth signal when it reaches the Bluetooth antenna signal feed point, the position parameter includes at least the incident angle and the phase of an incident Bluetooth signal, and then the relative position of the Bluetooth device is obtained through the trigonometric function algorithm to complete the positioning. The positioning method of the present invention uses the transmission time of the Bluetooth packet data set obtained by the internal processor chip to generate the arrival time difference of package data sets of different antennas according to microwave path difference of different antennas, and converts the time difference into calculation of the phase difference and arrival angles of sine waves, so as to complete measurement and positioning.

The method includes steps: network side transfers each broadcast/multicast traffic (BMT) data after processed by medium access control layer to physical layer; based on multiplexing control information, physical layer executes multiplexing process for each BMT data. The invention also discloses method for demultiplexing BMT data. The demultiplexing method includes steps: after demodulation at physical layer, UE obtains multiplexing control information (MCI) in use for multiplexing processing BMT data down sent from network side; based on MCI, physical layer only carries out demultiplexing and demodulating processes for relevant BMT data in broadcast/multicast multiplexing traffic data down sent from network side. The invention reduces power consumption needed by UE to demodulate multiplexing data, and guarantees that all UE with different transmission bandwidth can receive needed BMT, and gets better balance between performance of BMT and use ratio of wireless resources.

The invention discloses a multipath utilization-based beam forming method. With the method adopted, the problem that multipath coherent signals cannot be effectively received in a low-altitude multipath environment in the prior art can be solved. The implementation process of the method includes the following steps that: an array radar acquires echo signal data, and solves a received signal covariance matrix Rxx; Toeplitz covariance matrix reconstruction is performed on the received signal covariance matrix, so that a new covariance matrix R is obtained; eigenvalue decomposition is performed on the reconstructed variance matrix, so that a noise subspace EN is obtained; a spatial spectral function S(theta) is formed according to the noise subspace; an angle corresponding to the peak value point of a spectral peak is found according to the spatial spectral function, namely the angle of a target is estimated; and with the estimated target angle adopted as a beam direction, beamforming isperformed. According to the method of the invention, with the estimated target angle adopted as the beam direction, beamforming is performed, and therefore, the multipath coherent information can be effectively utilized to improve the signal multi-noise ratio of echo signals. The method can be used for the effective reception of multipath coherent signals in a low-altitude multipath environment.

The invention relates to Bluetooth locating method. The Bluetooth locating method is utilized in a Bluetooth locating system. The Bluetooth locating system comprises at least one Bluetooth transmitting module and at least one Bluetooth receiving module, the Bluetooth receiving module comprises a Bluetooth antenna device and a signal analysis module, the Bluetooth antenna device comprises a receiving end circuit board and a Bluetooth antenna array arranged on the receiving end circuit board, the Bluetooth antenna array comprises four antennas, all the antennas are electrically connected into the receiving end circuit board through a signal feeding point, and the four signal feeding points are arranged in a straight line, so that locating the Bluetooth transmitting module is completed through the Bluetooth locating calculation method. By means of the Bluetooth locating method of calculation of a large amount of data, a normal distribution method in statistics is applied.

The invention discloses a camera shooting module and a control method for the camera shooting module. The camera shooting module comprises a first imaging assembly, a second imaging assembly and a sensor assembly. The first imaging assembly comprises a first diaphragm. The second imaging assembly includes a second diaphragm. The sensor assembly is located on the exit optical path of the first diaphragm and the sensor assembly is located on the exit optical path of the second diaphragm. When the camera shooting module is operated, the first diaphragm and the second diaphragm are alternately opened such that the sensor assembly alternately receives the first imaging beam generated by the first imaging assembly and the second imaging beam generated by the second imaging assembly. The technical scheme of the invention provides camera shooting module with simple and light structure and low cost.

The invention discloses a Ka frequency band broadband receiving circuit which comprises a radio frequency amplifying circuit, a radio frequency filtering circuit, a frequency mixing circuit I, a localoscillator circuit I, an intermediate frequency filtering circuit I, an intermediate frequency amplifying circuit I, a frequency mixing circuit II, a local oscillator circuit II, an intermediate frequency switch filtering circuit II and an intermediate frequency amplifying circuit II. The radio frequency amplification circuit is sequentially connected with the radio frequency filter circuit, thefrequency mixing circuit I, the local oscillator circuit I, the intermediate frequency filtering circuit I, the frequency mixing circuit II, the local oscillator circuit II, the intermediate frequencyswitch filtering circuit II and the intermediate frequency amplifying circuit II in series. The frequency mixing circuit I is also connected with the local oscillator circuit I, and the frequency mixing circuit II is also connected with the local oscillator circuit II; wherein a chip used by each circuit is a chip-level device and is assembled by adopting a micro-assembly process. The chip-leveldevice is produced and assembled through the micro-assembly process, the size, the weight and the production cost are effectively reduced, the production efficiency is improved, and therefore the chip-level device can be widely applied to a communication system, a navigation system, a radar, a space electronic technology and other systems.

A mobile television underground tunnel covering system basing on the leaky cable comprises the following components: a low noise amplifier which is used for amplifying the signal source to the operational level necessary to an light transmitter; the light transmitter which is used for conveying the radio frequency signal outputted by the low noise amplifier; and a first optical coupler which is provided with at least one input end and a plurality of output ends and is used for distributing the optical power outputted by the light transmitter to a plurality of optical powers, and wherein the number of the output end can be set according to the actual need of the platform. A plurality of light receivers which are connected to the output ends of the first optical coupler through the optical fiber are used for conveying the light signal to the radio frequency signal. The leakage cable which is connected to the light receiver is used for transmitting the radio frequency signal. The invention settles the problem of interference between the signals with different frequencies. The transmission mode of combining the digital television direct-broadcasting station with the leaky cable is adopted and the cost for building the system is greatly reduced. The invention settles the problem of viewing mobile television in the underground and satisfies the requirement for the real-time information by the rail passenger.

The invention discloses a watch with a metal case. A bezel and the case are made of metal, and the bezel made of metal is used as an antenna radiator; a movement comprises a circuit board, and the circuit board is laterally fixed in the case body; the watch further includes a non-metallic bracket for supporting the bezel and separating the bezel from the case, and the non-metallic bracket is a ring-shaped bracket; the watch further includes first metal conductors, second metal conductors, and third metal conductors; the bezel and antenna signal lines of the circuit board are in potential connection through the first metal conductors; the bezel and the case are in potential short-circuit connection through the second metal conductors; and the case and the circuit board are signally in potential short-circuit connection through the third metal conductors. The invention utilizes the bezel as the antenna, can effectively solve the problem of antenna receiving of the metal watch, greatly reduces the influence of the metal case on the performance of the antenna, and greatly reduces the space occupied by the antenna inside the watch, has a simple structure, is easy to mount and demount, and is stable in structure and long in life.

The invention discloses a multipath using coherent beam forming method based on oblique projection. In the prior art, multipath coherent signals can not be effectively received in a multipath environment. In the invention, the above problem is solved. The method is characterized by according to echo data, acquiring orthogonal projection matrixes of a direct wave guide vector and a reflected wave guide vector; obtaining a corresponding oblique projection operator according to the orthogonal projection matrixes of the direct wave guide vector and the reflected wave guide vector; calculating direct wave and reflected wave signals after the oblique projection according to the two obtained oblique projection operators; and carrying out beam forming on the direct wave and reflected wave signalsafter the oblique projection and combining results to obtain a total output signal. Because an echo signal is obliquely projected to the directions of the direct wave and the reflected wave, and beamforming results of the direct wave signal and the reflected wave signal are combined, multipath information is effectively utilized, and the signal to noise ratio of the echo signal is improved. And the method can be used for efficient reception of the multipath coherent signals in the multipath environment.

The invention discloses an adaptive coherent beamforming method based on multipath information, which mainly solves the problem that multipath coherent signals can not be effectively received in a low-altitude multipath environment in the prior art. The method comprises steps: 1, in a narrow-band multipath environment, a radar generates transmitting signals, and array radar echo data are obtained;2, according to the echo data, an array covariance matrix is calculated; 3, the array covariance matrix is subjected to characteristic decomposition to obtain signal subspace and noise subspace; 4, based on the orthogonality of the signal subspace and the noise subspace, a multipath reflection coefficient is estimated; 5, the multipath reflection coefficient is compensated to obtain the optimal weighting vector; and 6, according to the optimal weighting vector, adaptive beamforming is obtained. In the method, adaptive beamforming is carried out through compensating the reflection coefficientto obtain the optimal weighting vector, multipath coherent information is used effectively, the signal-to-noise ratio of the echo signals is improved, and the method can be used to effectively receivethe multipath coherent signals in a multipath environment.

The invention discloses a high-speed latch capable of receiving millivolt signals. The latch comprises a reference current source used for providing a reference current for the latch; a sampling amplification circuit for carrying out sampling amplification on input signals; a latch circuit for carrying out latch on sampling point data of the sampling amplification circuit; and a current amplification circuit for carrying out amplification on charging and discharging current of the sampling circuit when the latch is switched from a latch state to a sampling state. The sampling amplification circuit is connected with the current amplification circuit; and the current amplification circuit is connected with the latch circuit. The current amplification circuit comprises an emitter follower, wherein current gain of the emitter follower is beta; and when the latch is switched from the latch state to the sampling state, the charging and discharging current of the sampling circuit has enough current to charge/discharge an output node after being amplified for beta times by the current amplification circuit. The high-speed latch solves the problem of reception of the millivolt high-speed signals of the latch, reduces a comparator structure of a conventional EOM circuit, reduces power consumption and simplifies circuit structure.

The invention discloses an adaptive coherent beam formation method of multi-path utilization. In the prior art, multipath coherent signals can not be effectively received in a low-altitude multipath environment. By using the method of the invention, the above problem is solved. The method is characterized by 1, in a narrow-band multipath environment, generating an emission signal by a radar and obtaining array radar echo data; 2, calculating an array covariance matrix based on the echo data; 3, carrying out characteristic decomposition on the array covariance matrix to obtain a signal subspaceand a noise subspace; 4, estimating a multipath reflection coefficient according to orthogonality between the signal subspace and the noise subspace; 5, constraining the multipath reflection coefficient to obtain an optimal weighted vector; and 6, according to the optimal weighted vector, acquiring adaptive beam formation. In the invention, through constraining the reflection coefficient, the optimal weighted vector is acquired and adaptive beam formation is performed, multipath coherent information is effectively used, a signal-to-noise ratio of the echo signal is increased, and the method can be used for effective reception of the multipath coherent signals in the multipath environment.

The invention discloses a resonant cavity for accumulative receiving of sine wave signals, and a working method of the resonant cavity. According to the resonant cavity, a coaxial inner core is arranged in the inner cavity of a cylindrical metal shell and connected with the center of the end face of one end of the cylindrical metal shell; at least two L-shaped feeding parts are symmetrically arranged in the inner cavity of the cylindrical metal shell relative to the coaxial inner core; one end of each L-shaped feeding part is connected with the tail end of the coaxial inner core, and the otherend of each L-shaped feeding part penetrates through the end face, connected with the coaxial inner core, of the cylindrical metal shell; dipole antennas are arranged at feed through holes outside the cylindrical metal shell; one arm of each dipole antenna is connected with the tail end of the L-shaped feed part, and the other arm of each dipole antenna is connected with a metal short-circuit end; and an output probe is coaxially installed in an output signal through hole in the cylindrical metal shell, one end of the output probe is vertically provided with a disc structure, and the other end of the output probe is connected with a switching device. The receiving problem of radar weak signals can be solved from the time domain.