192results about How to "Guarantee signal quality" patented technology

The invention belongs to the technical field of firefighting infrared detection, in particular a helmet type infrared detection and image transmission processing system. The system mainly comprises a front-end transmission system, a background command system and a relay system which transmit corresponding signals through radio waves. The front-end system integrated on equipment of a fire fighter acquires information in a fire, and transmits the information to the relay system and the background command system through the radio waves; and the background command system analyzes corresponding information to provide intuitive fire date and facilitate rescue deployment. The system has the characteristics of small volume, light weight, convenient carrying and the like, realizes functions of discovering rescue targets on the fire scene, acquisition and radio transmission of audio, video and data, image processing, intelligent analysis, real-time display and the like, accords with the development tendency of light, intelligent, high-efficiency and integrated firefighting equipment, and meets actual firefighting requirement and firefighting army assaulting requirement.

The invention discloses an unmanned aerial vehicle optimum relaying location positioning method and system for an unmanned aerial vehicle in the field of wireless communication. The method comprises the steps of establishing a link quality matrix for the unmanned aerial vehicle in a three-dimensional space; calculating a candidate optimum relaying location from the link quality matrix, wherein the unmanned aerial vehicle flies to the candidate optimum relaying location according to a shortest path; in a flying process, continuously communicating with a sending end and a receiving end, sampling to obtain the link quality; updating the whole link quality matrix through a matrix recovery method each time when new sample point data is obtained; and finishing positioning when the current location of the unmanned aerial vehicle is the optimum relaying location, otherwise reselecting the candidate optimum relaying location from the updated link quality matrix, updating the path and flying to the new optimum relaying location. According to the method and the system, the optimum relaying location of the unmanned aerial vehicle can be searched in the three-dimensional space rapidly and automatically to transmit signals between two points in the space, barriers and dynamic environments of the space can be adapted automatically, and the signal quality is ensured.

The invention relates to a heterogeneous network multi-base-station energy-saving management method. The method includes the steps of S1, executing the step S2 when a network is in a normal working state and executing the step S4 when the network is in an energy-saving working state; S2, obtaining service parameters of a micro base station, entering the sleeping state if meeting sleeping conditions, and switching users to other adjacent base stations capable of containing the residual service volume; S3, obtaining service parameters of a macro base station, entering the sleeping state if meeting sleeping conditions, conducting coordinative compensation through other adjacent base stations capable of containing the residual service volume, and executing the step S6; S4, obtaining service parameters of each base station, executing the step S5 if meeting annular conditions, and executing the step S6 otherwise; S5, starting the base stations, in the sleeping state, of the network; S6, optimizing and adjusting transmission power of other base stations which conduct coordinative compensation on the target macro base station. By means of the method, the flexible coverage of network communication service can be ensured, the user signal quality can be maintained, the network multi-coverage can be reduced, and the network recovery complexity can be lowered.

The invention discloses an assistance system for disabled people based on a brain control mobile eye and a control method for the assistance system. The system comprises vision inducing equipment, signal acquisition equipment, a signal processing module and peripheral control equipment, wherein the vision inducing equipment is used for providing a user interaction interface of the whole system, and a user carries out control by using the interface; the signal acquisition equipment is used for acquiring the brain electrical activity of the scalp, converting an acquired analog signal into a digital signal and transmitting the signal to the signal processing module; the signal processing module is used for analyzing acquired data in real time and controlling an experimental process; the peripheral control equipment comprises the mobile eye and a wheelchair; the mobile eye comprises an intelligent trolley and a camera holder arranged on the intelligent trolley; the peripheral control equipment can do corresponding motion according to a control instruction sent by the signal processing module. According to the assistance system for the disabled people based on the brain control mobile eye and the control method for the assistance system, the safety of wheelchair control can be improved.

Syncretizing DTV terrestrial broadcasting with satellite broadcasting signal, the disclosed positioning and navigating method raises positioning performance. Receiving signals of civil DTV ground transmitting station and/or DTV broadcast satellite and navigation satellite with multiple space coordinates are known, the method determines space position of receiver. Being built on broadcast transmission system of radio signal, the method receives signals from radio broadcast systems and observes multiple emission sources to form system structure of combining multiple wireless positioning system and mode of position and navigation so as to obtain navigating solution of combined positioning system. All new operating mode of combined navigating system includes two types of wireless positioning system for observing ground and space at same time in the invention.

The invention discloses an optical transceiver with a serial-parallel conversion function, and aims at providing a device which can switch a low-speed parallel electric signal and a high-speed serial optical signal. The optical transceiver is composed of a light emitting module and a light receiving module. The light emitting module is composed of N stages of time-sharing modulation submodules, a transmitting terminal pulse type driver and a first light absorption device. Each stage of time-sharing modulation submodule is composed of a first optical switch, a light modulator and a light beam combination device. The light receiving module is composed N stages of time-sharing demodulation submodules, a parallel shaping amplifier array, a receiving end pulse type driver and a second light absorption device, wherein the N stages of time-sharing demodulation submodules are connected to an optical signal bus in series through light delay lines. Each stage of time-sharing demodulation submodule is composed of a second optical switch and a light detector. By means of the optical transceiver, serial-parallel conversion can be conducted on a light path while photovoltaic conversion is conducted, the link serial rate is increased, the bandwidth of a processor chip interface is increased, the power consumption in the information transmission process is lowered, and the signal quality of communication links is improved.

The invention discloses an optical module and an adaptive regulation method for the rate mode of a clock and data recovery (CDR) chip of the optical module. The optical module comprises the CDR chip, a laser emission light source and a microprogrammed control unit (MCU), wherein the CDR chip integrates a laser driving circuit and a first CDR unit; the first CDR unit locks a received electric signal according to the set initiative rate mode, shapes the electric signal and outputs the shaped electric signal to the laser driving circuit to drive the laser emission light source to emit laser; and the and MCU regulates the initiative rate mode of the CDR chip according to initiative unlock state information acquired from the CDR chip. The MCU in the optical module acquires the unlock state information, which serves as feedback information, from the CDR chip, and the rate mode in the CDR chip is adaptively regulated, so that the CDR chip can regulate to have the rate mode suitable for locking signals at the current rate according to the current signal rate, and shape signals in a wider rate range to ensure signal quality.

The invention provides a method for setting the LTE network in a high-speed rail environment. The LTE network comprises N base stations and antennae, wherein N is larger than 1, the base stations are distributed on the two sides of a railway in a stagger and zigzag mode, the incidence angle theta of each base station is not smaller than 10 degrees, the vertical distance D between each base station and the edge of the railway meets the inequation that S/2*tan theta<D<S/2, S represents station spacing, and theta is the minimum incidence angle. By the adoption of the method, through targeted network plan of the high-speed rail scene, the high-quality LTE network can be provided for an operator, adverse effects caused by various factors during high-speed running of a train are reduced, signal quality is guaranteed, and user experience is improved.

The invention discloses a silicon substrate integrated coherent light transmitter chip and a transmitter. The silicon substrate integrated coherent light transmitter chip comprises an optical coupler, a light beam splitter, a light beam combining device, a silicon substrate modulator, a fixed phase drift device and a coupling polarization beam combining device. The optical coupler is used for achieving coupling of input end light. The light beam splitter and the light beam combining device are used for achieving the beam splitting and beam combining functions of optical signals. The silicon substrate modulator is a core modulator part, and is used for achieving the function of loading electrical signals to the optical signals, and generation of modulation signal light is finished. The fixed phase drift device is used for achieving fixed rotating of the phase position of the optical signals. The coupling polarization beam combining device is used for combining two paths of signal light with the transverse electric (TE) polarization state into one path of transverse electric and magnetic field (TEM) signal light. The silicon substrate integrated coherent light transmitter chip and the transmitter are suitable for an optical communication system with multi-phase-position modulating and polarization multiplexing, and have the advantages that cost is low, the CMOS technology is compatible, achieving is easy, integrity is high, and packaging is easy.

The invention is concerned with the broad band microwave local-surge generator, it is: the vector-controlled oscillator creates low-voice high-frequency signal to the power divider, the phase-lock circuit, the loop filter in turn, then feedback to the vector-controlled oscillator in order to form the phase-lock loop signal source creating circuit that is the decimal fraction frequency division and reflecting-phase mixed-dispel suppression, the high-frequency signal creating by the circuit passes the frequency multiplier, the filter and the amplifier to get the signal source with different frequency that is needed by the microwave system. The invention can achieve the multi circuit local-surge creation on the veneer with lower cost.

The invention discloses a wearable electroencephalogram acquisition device. After the device is worn on the head of a user, an electroencephalogram signal of the user is extracted by a surface electrode on the device, then the extracted electroencephalogram signal is input to a dual channel analog front end and is subjected to filtering, amplification and analog-digital conversion in sequence; a digitalized electroencephalogram signal is obtained and is input to a wireless transceiver, and the wireless transceiver packages the digitalized electroencephalogram signal and sends the signal to terminal equipment by a built-in radio frequency antenna. In a specific processing process, the kernel of the wireless transceiver processes a quantized signal and feeds back to an analog front end in real time for adjusting the work state of equipment, and the high-efficiency and low-power-consumption acquisition and transmission of the electroencephalogram signal is ensured.

The invention relates to an all-fiber current transformer for an open loop independent double-sampling circuit based on a single light path. The all-fiber current transformer comprises a phase modulation module, a photoelectric detector, a first AD switching circuit, a second AD switching circuit and a double-sampling data processing unit, wherein the phase modulation module comprises a square wave control circuit, a DA switching circuit and a phase modulator which are connected with each other in turn; the phase modulator is arranged in the single light path; the first AD switching circuit and the second AD switching circuit are both connected with the photoelectric detector and the double-sampling data processing unit; the sequence signals in the double-sampling data processing unit and the square wave control circuit are synchronous to each other. The structure adopting the single light path, double AD sampling, respective modulation and synchronous matching square wave for controlling DA switching is adopted by the invention, so that the problem of FOCT (Fiber Optical Current Transformers) dual configuration is solved and the all-fiber current transformer has the advantages of simple structure, small volume, low cost, high integrated degree, and the like.

Embodiments of the present invention relate to a signal identifying method, including: obtaining signal characteristics of a current frame of input signals; deciding, according to the signal characteristics of the current frame and updated signal characteristics of a background signal frame before the current frame, whether the current frame is a background signal frame; detecting whether the current frame serving as a background signal frame is in a first type signal state; and adjusting a signal classification decision threshold according to whether the current frame serving as a background signal frame is in the first type signal state to enhance the speech signal identification capability.

The invention discloses a method and device for optimizing load balancing. The method comprises the steps of: when judging that a cell of an eNB (evolved Node) needs to be subjected to load balancing by the eNB, selecting all the UEs (User Equipment) or part of UEs in the cell, and adjusting threshold parameters of switching events, then sending the threshold parameters to the selected UEs; and according to measurement reports and load condition of the cell reported by the UEs, selecting one or more UEs for switching by the eNB. According to the method, while the load of a source cell is reduced, the signal quality after the switched UEs are switched to a target cell can be guaranteed, so that the ping-pong switching is avoided, and the UEs unnecessarily must be switched to a cell of the same coverage or inclusion relation.

An ultra-wide-band multi-mode radar signal generation method used in modern imaging radars comprises the following main steps: 1) generating a single-narrowband digital intermediate frequency signal by a data signal source; 2) filtering out-of-band interference signals in the signal generated in step 1; 3) spreading spectrum and carrying out up conversion on the signal obtained in step 2; 4) collecting and analyzing the signal obtained in step 3 by using a general instrument; 5) evaluating whether the signal satisfies requirements according to the step 4, if the signal does not satisfy the requirements, carrying out predistortion to the digital signal source, returning to step 1 and circulating from the step 1 to the step 4 till the signal satisfies the requirements so as to complete the generation of the ultra wide band signal. The invention also provides an apparatus which is used to realize the above method. In the method of the invention, spread spectrum is adopted to obtain the ultra wide band radar signal under a low sampling clock; a plurality of work modules, which are a plurality of different bandwidths and pulse widths radar signals, can be completed. The invention plays an important role on raising radar imaging resolution and enhancing radar system flexibility.

The invention discloses a space division multiple access (SDMA) protection method of an edge user of a cell in an HSDPA system. The method comprises the following steps: A1. acquiring SDMA user information of the cell and recording reporting information of various users; and A2. judging whether any user is on the edge of the cell according to the reporting information of various users, if yes, executing the step A3; A3. deleting the user from an SDMA user collection and transmitting data for the user by a CDMA method. Therefore, when the SDMA user is on the edge of the cell and the signal is weak, the data is not transmitted by the SDMA method, which can ensure the signal quality and avoid occurrence of error blocks; when a non-SDMA user satisfies the condition of data transmission by the SDMA method, the non-SDMA user is added to the SDMA user collection, and the data is transmitted by the SDMA method for the user. The method has the advantages of flexible application, convenient implementation and effective protection for the signal quality of the edge user.

The invention provides a multifunctional compound repeater which comprises antennas, diplexers, photoelectric converters, electronic-to-optical converters, low noise amplifiers, down converters, ICSs, input gating devices, first frequency selection processors, output gating devices, second frequency selection processors, up converters, and power amplifiers. Through carrying out different configurations on the gating devices, the repeater can realize a plurality of different functions. The multifunctional compound repeater has a flexible networking function, a traditional wireless repeater and a traditional fiber repeater are incomparable to the function, and complexity of network planning is substantially reduced.

The invention discloses a wireless resource scheduling method and apparatus, and relates to the technical field of communication. The problems of poor signal quality and poor system fairness of a remote terminal can be solved. The wireless resource scheduling method disclosed by the invention comprises the following steps: determining available carrier information of a terminal, wherein the available information comprises an available carrier number and available carrier frequency; calculating a weight factor according to the available carrier information and a business parameter of current business, wherein the business parameter comprises at least one of a business bearer type, a time delay and a packet loss rate; calculating the corresponding priority of the terminal when transmitting data on each available carrier according to the weight factor, the instant transmission rate of the terminal when transmitting data on each available carrier and the average transmission rate of the terminal when transmitting data on each available carrier; and determining the available carriers with priorities meeting preset requirements as carriers for data transmission. The wireless resource scheduling method and apparatus disclosed by the invention is suitable for application in communication systems with carrier aggregation functions.

The invention is suitable for the communication field, and provides a method and a device for adjusting frequency synchronization, and a communication receiver. The method comprises the following steps: estimating frequency deviation of UE (user equipment) and a base station, so as to generate estimation frequency deviation; generating temperature compensation frequency according to the current temperature information; generating a residual frequency deviation value according to the estimation frequency deviation and the temperature compensation frequency; setting a frequency deviation adjustment distribution coefficient; calculating to generate a base band frequency deviation adjustment value and a frequency deviation adjustment value of radio frequency according to the frequency deviation adjustment distribution coefficient and the residual frequency deviation value; and carrying out frequency adjustment on the radio frequency (XO, PLL) and a base band according to the frequency deviation adjustment value of the radio frequency and the base band frequency deviation adjustment value, so as to realize synchronization. With the adoption of the method and the device for adjusting the frequency synchronization, and the communication receiver, when the XO adjustment precision and an update period are limited, the frequency adjustment is commonly carried out by adopting the base band and the radio frequency; and the temperature compensation is carried out, so that carrier synchronization, sample value synchronization, symbol synchronization are effectively and accurately realized, the signal quality of the receiver is guaranteed, the crystal oscillator cost is lowered, and the application range is enlarged.