111results about How to "Increase signal power" patented technology

A remote control apparatus uses wireless communication to control driving of a control object such as a vehicle. When the drive condition is changing, as when the vehicle is being steered to follow a curve in a travel route, while also the vehicle speed exceeds a specified threshold value, processing is executed for reducing a communication delay between the remote control apparatus and the control object, to thereby ensure sufficient speed of control response.

A Global Navigation Satellite System (GNSS) receiver and associated method capable of acquiring weak GNSS signals from a plurality of GNSS satellites produces a GNSS signal's code time, carrier frequency, and data bit transition parameters for subsequent signal tracking and position fixing. The GNSS receiver includes a baseband signal processor with special functionalities for acquiring weak signals. In a preferred embodiment, the time and frequency uncertainty space is reduced using available information and then special techniques are used to rapidly search the remaining uncertainty space. Successive reversal of short-length correlations within a data bit interval (a block) enables data bit transition detection and data bit sign correction prior to coherent integration. Fast Fourier Transform (FFT) is applied as a bank of bandpass filters to coherently accumulate blocks of short-length correlations over extended coherent integration intervals to boost the signal power while averaging noise out despite unknown data bit transitions.

In the method and apparatus of controlling power of a transmitted communication signal, a communication signal is amplified and transmitted. At least one parameter on the transmitted signal is received, and a measure of interference with the transmitted signal is determined based on the received parameter. An average power level of the communication signal is increased by clipping the communication signal prior to amplification by an amount based on the determined measure.

The invention discloses a frequency spectrum cognitive method, cognitive radio user equipment and the structure of a central node in a cognitive radio system. In the frequency spectrum cognitive method, at least one cognitive radio user in the cognitive radio system detects signals of a main user in a selected channel, and sends the detection result to the central node of the cognitive radio system, wherein the detection result is the parameter correlative with the average signal-to-noise ratio of the channel; and the central node combines the detection results from all the cognitive radio users detecting the same channel, makes the conclusive judgment according to the result of the combination to obtain the judgment result on whether the channel is occupied by the main user in a main usersystem, and can further return the result to all the cognitive radio users. Besides, the invention also discloses a method and a device for energy detection.

A Global Navigation Satellite System (GNSS) receiver and associated method capable of acquiring weak GNSS signals from a plurality of GNSS satellites produces a GNSS signal's code time, carrier frequency, and data bit transition parameters for subsequent signal tracking and position fixing. The GNSS receiver includes a baseband signal processor with special functionalities for acquiring weak signals. In a preferred embodiment, the time and frequency uncertainty space is reduced using available information and then special techniques are used to rapidly search the remaining uncertainty space. Successive reversal of short-length correlations within a data bit interval (a block) enables data bit transition detection and data bit sign correction prior to coherent integration. Fast Fourier Transform (FFT) is applied as a bank of bandpass filters to coherently accumulate blocks of short-length correlations over extended coherent integration intervals to boost the signal power while averaging noise out despite unknown data bit transitions.

The invention discloses a broadband signal arriving direction estimation method based on iteration spectral reconfiguration. The realizing process comprises the steps of transforming array antenna receiving data into a frequency domain through windowing Fourier transform, conducting multi-sub-band frequency domain segmentation to the data in the frequency domain, initializing each covariance matrix of each sub-band, obtaining an initialized power matrix of a frequency point according to a covariance matrix of one frequency point in the sub-bands, updating the covariance matrix of a signal at the position of the frequency point according to the initialized power matrix, obtaining corresponding optimum weight of a search angle space by the adoption of the least-squares method, updating the power of each corresponding angle according to the optimum weight on each search angle to obtain the initialized power matrix of a next frequency point and conducting iteration process, and estimating the signal arriving direction through a power spectral peak of the search angle space. The broadband signal arriving direction estimation method based on the iteration spectral reconfiguration can estimate the signal arriving direction of an incidence signal source under the conditions of weak signals and short data, is high in precision, and has the advantage of decorrelation.

Disclosed is a technique to estimate at least a portion of an attitude, such as an azimuth angle from true North, based on beam angles from a controlled reception pattern antenna (CRPA) to space vehicle locations. Other attitude information such as roll and / or pitch can also be estimated. The at least portion of the attitude can be provided with or without an additional sensor, such as a compass or magnetometer, an inertial measurement unit (IMU), or the like. An attitude estimate can be useful because oftentimes the attitude of an object can vary from its track or velocity direction.

A switching semiconductor device includes a first compound layer formed on a single crystal substrate which consists of silicon carbide or sapphire, and consisting of a general formula InxGa1-xN, where 0≦x≦1; a second compound layer formed on the first compound layer, and consisting of a general formula IyAlzGa1-y-zN, where 0≦y≦1 and 0<z≦1; and a gate electrode formed on the second compound layer. The gate electrode is electrically connected to a resistance element formed on a first interlayer insulating film that covers the gate electrode, through a metal wiring formed on a second interlayer insulating film that covers the first interlayer insulating film.

A transmitter includes a first limiter for performing a first clipping in which an amplitude part at a level higher than an amplitude level based on a first clipping level is cut out from an input signal to be subjected to power amplification, a second limiter for performing a second clipping in which an amplitude part at a level lower than the amplitude level based on a second clipping level is cut out from a first signal that has undergone the first clipping, a separation section for separating a second signal that has undergone the second clipping into an amplitude modulated part and a constant amplitude part, a first amplifier for amplifying the amplitude modulated part, a second amplifier for amplifying the constant amplitude part, and a combiner for outputting a third signal obtained by combining the amplitude part amplified by the first amplifier and the constant amplitude part amplified by the second amplifier.

The present invention discloses a method and an apparatus for measuring quality parameters of optical transmission channels. The apparatus comprises: a tunable optical filter for receiving an optical signal, performing wavelength or optical carrier demultiplexing on the optical signal, and out-of-band ASE noise suppression; an optical coherent receiver connected to the tunable optical filter, for performing polarization- and phase-diversity detection on the filtered optical signal and converting it into multiple lane baseband electrical signals; analog-to-digital converters for sampling and quantizing the multiple lane baseband electrical signals so as to convert the them into multiple lane digital signals; a digital signal processing module for processing the multiple lane digital signals to obtain quality parameters; and an display module for displaying the quality parameters. By the device according to an embodiment of the invention, real-time measurement of various key performance parameters of the 40 Gbps, 100 Gbps and extra-100 Gbps (for example, 200 Gbps, 400 Gbps and 1 Tbps) coherent polarization-multiplexed system is achieved simultaneously, especially the issue of real-time measurement of the in-service in-band OSNR is solved. Therefore, the network operation and maintenance are facilitated and the cost of network operation and maintenance is saved.

A synthetic aperture laser imaging radar large-visual-field heterodyne detection device uses a synthetic aperture and a heterodyne reception technique as a base and comprises a collimating lens, a beam splitter, a transmitting telescope, an defocusing receiving telescope, an adjustable convergent lens diaphragm, a focusing lens, a heterodyne receiving beam combiner and a detector, wherein the transmitting telescope and defocusing receiving telescope are separated. The synthetic aperture laser imaging radar large-visual-field heterodyne detection device utilizes a receiving telescope defocusing structure, and can eliminate influence of received signal wave-surface aberration. The aperture of the receiving telescope is much larger than that of the transmitting telescope, and received signal power is increased. A convergent lens is used so as to achieve a receiving visual field much larger than a visual field received by a telescope directly and determined by optical antenna aperture diffraction, heterodyne efficiency in the whole visual field is relatively constant, and stable heterodyne current signals can be received. The adjustable convergent lens diaphragm can control matching of signal flare and the area of the detector, increases local oscillator light energy utilization rate, and improves heterodyne signal strength.

The invention discloses a personnel counting method based on a millimeter-wave radar, and the method comprises the steps: A, installing the millimeter-wave radar at a certain height position in a measured space, enabling a field of view of the millimeter-wave radar to cover an entrance and exit region of the measured space, transmitting an electromagnetic wave signal to a measured space range through the millimeter wave radar, and receiving an echo signal; B, outputting multiple pieces of target point information corresponding to the human body by the the millimeter wave radar according to specific setting of CFAR threshold parameters; C, clustering the target points, and representing the movement track of a person by using the clusters; and D, setting a counting boundary, and judging whether the person enters or leaves the measured space according to the characteristic that the track passes through the counting boundary. According to the method, the millimeter wave radar is used for transmitting radio waves to directly irradiate a to-be-measured space, the position and the movement track of the people target are measured according to reflected electromagnetic wave signal, whetherthe people target is located in the area or not is judged, and thus the purpose of counting the number of people in a specific range is achieved.

The present invention relates to a method for generating a play-list of media files, includes the steps of: adjusting the current gain value in response to a control command for adjusting a current gain value during the course of a media file being played; obtaining a gain value having been adjusted; subtracting a referenced gain value by the adjusted gain value to obtain a gain difference; obtaining a weight value corresponding to the gain difference from a weight table; updating the weight value in a weight field of the media file; receiving a control command for generating a play-list; obtaining the weight value in the weight field in the weight field of each media file; and generating the play-list of the media files according to the weight values thereof. The present invention also provides a system for generating the play-list, making the play-list more tailored to a user's listening preferences.

Disclosed is a technique for compensating for optical passband shift of an optical component (for example an optical demultiplexer). A broadband source coupled to a dispersive element generates a chirped pulsed optical signal. Data is modulated onto particular wavelengths of the chirped pulsed optical signal by appropriately synchronizing a data modulator. The modulated signal is transmitted to the downstream optical demultiplexer, which may be subject to passband shift due to, for example, changes in environmental conditions. A feedback signal from an output port of the demultiplexer is provided to the transmitter and is used to phase shift the modulator. The phase shift results in effectively adjusting the wavelength onto which the data is modulated to substantially correspond to the passband centers of the demultiplexer.

For wavelength division multiplexing (WDM) communications, apparatus and methods are provided for performing tone-based optical channel monitoring that is less sensitive to stimulated Raman scattering (SRS). In tone-based optical channel monitoring, in which WDM channels are modulated with one or more tones, detecting and measuring the tone power is commonly used as a measure of signal power in each channel. In WDM systems with long fiber spans and high signal powers, however, SRS tends to transfer energy from shorter wavelengths to longer wavelengths, whereby the tones are no longer accurately indicative of the signal power of the individual wavelength channels. Apparatus and methods are provided which reduce the effect of SRS by filtering the monitored WDM signals into sub-bands and detecting each sub-band independently.

In the method and apparatus of controlling power of a transmitted communication signal, a communication signal is amplified and transmitted. At least one parameter on the transmitted signal is received, and a measure of interference with the transmitted signal is determined based on the received parameter. An average power level of the communication signal is increased by clipping the communication signal prior to amplification by an amount based on the determined measure.

The invention discloses a radio frequency signal random delay device and a radio frequency signal random delay method based on a microwave photon cycling frequency shift, and relates to the field of optical communication techniques, microwave techniques and electronic countermeasure techniques, mainly used for storing a radio frequency signal in an electronic countermeasure radar jamming system. The method is as shown in figures. The device comprises a light source 1, a polarization controller 2, a phase modulator 3, an optical band pass filter 4, a 2*2 optical coupler 5, a radio frequency source 6, a 90-degree radio frequency orthocoupler 7, a double parallel mach-zehnder modulator 8, a standard single mode fiber 9, an erbium-doped optical fiber amplifier 10, a wavelength division multiplexer 11, a photoswitch matrix 12, an adjustable delay module 13 and a photoelectric detector 14. The phase modulator is used for receiving the radio frequency signal. An optical loop is used for being in combination with the double parallel mach-zehnder modulator to perform frequency shift delay on the signal. And delay storage of the radio frequency signal at any time is finally achieved by the wavelength division multiplexer and the switch matrix, in combination with the adjustable delay module.

For real-time Three Dimensional ultrasonic Doppler imaging, a number of techniques are combined in order to increase detection sensitivity. This disclosure is directed, primarily, to improved filter design employing transient removal, mean removal and / or trend removal.

A rebroadcasting apparatus for mobile media includes a receiving antenna and a transmitting antenna. The signal to be rebroadcast is received with a circularly polarized directional antenna. The transmitting antenna has circular polarization opposite to the polarization of the receiving antenna. Amplifiers and filters may be included between receiving and transmitting antennas to regulate retransmitted signal quality. The transmitting antenna uses one or more bays of quasi-helical dipole radiators excited using manifold feed equipped with tuning paddles. The transmitting antenna may be formed from light-weight sheet metal or other readily mass-produced materials. The transmitting antenna may be housed within an ordinary security camera enclosure or similar radio-transparent housing.

The invention discloses a channel estimation method and system based on positioning information assistance in an RIS system in an Internet of Vehicles environment. The method comprises the following steps: 1, obtaining relative positions of a base station, an RIS and a vehicle receiving end according to the Internet of Vehicles; 2, according to the relative positions, acquiring the azimuth angles and elevation angles of effective signals from the base station to the RIS and from the RIS to the receiving end in the propagation process; 3, according to azimuth angles and elevation angles of received signals and reflected signals of the RIS, constructing a cascade channel G from the base station to the RIS and cascade channels hr, k from the RIS to a receiving end; 4, considering downlink pilot frequency transmission, constructing a channel model, receiving signal conversion by a single-user receiving end, and constructing a cascade channel; 5, calculating an optimal reflection coefficient of each unit of the RIS by using position information based on a criterion of maximum receiving signal power of the receiving end, and constructing a reflection coefficient matrix [Theta]; and step 6, according to the obtained reflection coefficient matrix [Theta] and the single-user receiving signal yk, obtaining an estimation channel Hc through an LS algorithm.

The invention provides an LTE (Long Term Evolution)-based rail transit wireless data interference suppression method and system. The method includes the following steps that: beam patterns corresponding to working time periods are preset for each base station of stations according to a station train arrival and stop timetable; and when the base stations are working, beamforming is carried out according to the preset beam patterns. According to the beamforming, when a certain train arrives at a station, two base stations in a network corresponding to the train project beams to corresponding UE on the train respectively according to the preset beam patterns; and when trains of two different lines arrive at a station simultaneously, base stations in two networks, which use the same frequency band, carry out beamforming according to frequency bands, and project beams of a part of frequency bands to UE corresponding to the base stations. With the method and system of the invention adopted, the problem of co-channel interference between train LTE data transmission networks can be solved; and when frequency band resources are limited, signal power in the azimuths and directions of target UE can be improved to the great extent through time-dependent beamforming, and the co-channel interference of the stations can be reduced.

A method and apparatus for single end loop testing for DSL provisioning and maintenance provides testing of the DSL loop using digital techniques including frequency compensation, matched filtering and median filtering, to remove strong background and enhance desired signal for peak detection. The SELT system allows DSL providers to extract loop information from reflective measurements at the central office (CO) so as to determine loop capability of supporting different DSL services. The method and apparatus acquires the desired signal (the far-end echo) which is submerged in the correlated background noise (the near-end echo) by providing a process for detecting loop length and termination types with high accuracy for loops up to 12 kft for 24 AWG and up to 9 kft for 26 AWG by exploiting several digital signal processing techniques including frequency.

The invention discloses a highway construction monitoring system based on the Internet of Things. The system comprises a signal receiving circuit, a frequency modulation filter circuit and a voltage stabilization output circuit, wherein the signal receiving circuit receives signals of a signal transmission channel input end for a control terminal in the highway construction monitoring system basedon the Internet of Things, the frequency modulation filter circuit receives output signals of the signal receiving circuit in two paths, in one path, frequency modulation is executed for the signalsthrough a frequency modulation circuit composed of a triode Q1, an inductor L4 and an adjustable capacitor C10, and in the other path, interference signals are filtered out through a disturbance filter circuit composed of an operational amplifier AR1, an operational amplifier AR3, a capacitor C8 and a capacitor C9, and the signals are input into an in-phase input end of an operational amplifier AR4, a difference circuit composed of the operational amplifier AR4, an operational amplifier AR5 and a variable resistor RP1 performs differential treatment for the signals, finally, the voltage stabilization output circuit performs voltage stabilization through a triode voltage stabilization circuit composed of a triode Q2 and a voltage stabilization tube D3 and then outputs the signals. The signals can be calibrated automatically and prevented from distortion.

A switching semiconductor device includes a first compound layer formed on a single crystal substrate which includes silicon carbide or sapphire, and including a general formula InxGa1-xN, where 0<=x<=1; a second compound layer formed on the first compound layer, and including a general formula InyALzGa1-y-zN, where 0<=y<=1 and 0<z<=1; and a gate electrode formed on the second compound layer. The gate electrode is electrically connected to a resistance element formed on a first interlayer insulating film that covers the gate electrode, through a metal wiring formed on a second interlayer insulating film that covers the first interlayer insulating film.

A public addressing and emergency system has a person or message signal generator for generating a message whose contents comprise at least one of a sign language message, a voice message, and a text message and a transmitting system for transmitting the message signal to at least one of a mobile unit and at least one fixed display unit in at least one location. The message signal transmitting system is bi-directional enabling bi-directional message communication and may include a device such as a splitter for generating multiple signals and / or a device such as a booster for increasing or maintaining the power of the signals. The public addressing system can be independent, or tied in with internal processing of commercial entities and their electronic displays to present advertising and educating the public about the emergency system.

The invention belongs to the technical field of external radiation source radar positioning, and relates to a method for positioning an external radiation source weak target based on multi-signal fusion. According to the invention, received multi-channel echo signals and direct wave signals are subjected to FDPC process to complete frequency domain pulse compression; then the range migration is eliminated through an RFT algorithm; and finally non-coherent accumulation is performed on the channel signals to judge whether a peak point exceeds the threshold or not. Computer simulation shows thataccumulation effect comparison is performed on the method and a method of carrying out RFT by a single-channel signal, the simulation result shows that the method can increase the accumulation gain byabout 1.7dB, the system performance can be improved, and the target detection signal-to-noise ratio can be effectively improved.

The invention discloses a pipeline corrosion measuring instrument signal calibration device. The pipeline corrosion measuring instrument signal calibration device comprises a frequency acquisition circuit, a frequency division feedback circuit and a buffer output circuit. The frequency acquisition circuit collects analog signal frequency when a pipeline corrosion measuring instrument works. The frequency division feedback circuit uses an inductor L1, a capacitor C4 and a capacitor C5 to form a frequency division circuit to conduct frequency demultiplication on an output signal of the frequencyacquisition circuit, then a push-pull circuit composed of an audion Q3, an audion Q2, an audion Q4, a diode D4 and a diode D5 is adopted to process the signal, the signal is input into the buffer output circuit after voltage stabilization by a constant voltage circuit composed of an operational amplifier AR1 and an operational amplifier AR3, an operational amplifier AR2 is used for feeding back the signal to an eemitter potential of the audion Q2, at last, a resistance R16, a capacitor C8 and an audion Q5 are adopted to form a buffer circuit to buffer the signal by the buffer output circuit,and the signal is output. The analog signal frequency can be converted into a compensation signal of the analog signal of the pipeline corrosion measuring instrument, and the signal can be automatically calibrated.

A method for determining spectral calibration data ([lambda]cal(Sd), Sd, cal(lambda)) of a Fabry-Perot interferometer (100) comprises: forming a plurality of filtered spectral peaks (P1, P2) by filtering input light (LB1) with a Fabry-Perot etalon (50) such that a first filtered peak (P1) corresponds to a first transmittance peak (P1) of the etalon (50), and such that a second filtered peak (P2) corresponds to a second transmittance peak (P2) of the etalon (50), using the Fabry-Perot interferometer (100) for measuring a spectral intensity distribution (M(Sd)) of the filtered spectral peaks (P1, P2), wherein the spectral intensity distribution (M(Sd)) is measured by varying the mirror gap (dFP) of the Fabry-Perot interferometer (100), and by providing a control signal (Sd) indicative of the mirror gap (dFP), and determining the spectral calibration data ([lambda]cal(Sd), Sd, cal(lambda)) by matching the measured spectral intensity distribution (M(Sd)) with the spectral transmittance (TE(lambda)) of the etalon (50).

The present invention discloses a method and an apparatus for measuring quality parameters of optical transmission channels. The apparatus comprises: a tunable optical filter for receiving an optical signal, performing wavelength or optical carrier demultiplexing on the optical signal, and out-of-band ASE noise suppression; an optical coherent receiver connected to the tunable optical filter, for performing polarization- and phase-diversity detection on the filtered optical signal and converting it into multiple lane baseband electrical signals; analog-to-digital converters for sampling and quantizing the multiple lane baseband electrical signals so as to convert the them into multiple lane digital signals; a digital signal processing module for processing the multiple lane digital signals to obtain quality parameters; and an display module for displaying the quality parameters. By the device according to an embodiment of the invention, real-time measurement of various key performance parameters of the 40 Gbps, 100 Gbps and extra-100 Gbps (for example, 200 Gbps, 400 Gbps and 1 Tbps) coherent polarization-multiplexed system is achieved simultaneously, especially the issue of real-time measurement of the in-service in-band OSNR is solved. Therefore, the network operation and maintenance are facilitated and the cost of network operation and maintenance is saved.

The invention discloses a line controller power carrier communication structure which comprises a main controller and a line controller as well as a power carrier line used for connecting the main controller with the line controller. The line controller power carrier communication structure is characterized in that a driving circuit butted with the line controller is arranged on the main controller and comprises a transmitted signal processing circuit and a received signal conversion circuit; a sampling circuit and a rectifying voltage-stabilizing circuit are arranged on the line controller; the sampling circuit is used for converting and then outputting a control signal transmitted by the main controller to a line controller chip and encoding a command of the line controller chip to an electric signal and then transmitting the electric signal to the main controller; the rectifying voltage-stabilizing circuit is used for powering up the line controller. According to the invention, serial communication (four-line) of an original line controller is broken through, and according to a power carrier principle, two non-polar connecting lines are used as both a data transmission channel and a power supply channel, so that the functions of water heater running and water heater running state displaying of the line controller are realized.