195results about How to "Guarantee signal quality" patented technology

The present invention realizes high density mounting along with achieving power source sharing by a digital semiconductor element and an analog semiconductor element in a semiconductor device. An power layer for analog is connected to one end of an EBG layer, a power layer for digital is connected to the other end of the EBG layer, ground terminals for the respective elements are connected to a common ground layer, and a ground layer for separating the power layer for analog and the EBG layer from each other is disposed between the power layer for analog and the EBG layer. Thereby, high density mounting is achieved along with reducing interference of power source to an analog chip.

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.

The invention relates to a radio-frequency circuit structure for achieving the function of converting GNSS satellite signals into baseband signals. The radio-frequency circuit structure comprises a shunt function module, a plurality of frequency conversion function modules, a plurality of local oscillator signal modules and a plurality of analog-digital conversion modules. The shunt function module is used for dividing the GNSS satellite signals received by an antenna into satellite signals in a plurality of channels, each frequency conversion function module is used for conducting frequency conversion on the satellite signals in the corresponding channels to form approximate zero frequency signals, and each local oscillator signal module is used for generating local oscillator signals and outputting the local oscillator signals to the frequency conversion function modules. According to the radio-frequency circuit structure for achieving the function of converting the GNSS satellite signals into the baseband signals, the structure is adopted, therefore, frequency conversion and follow-up signal processing can be carried out on the satellite signals in each frequency band independently, the signal quality is guaranteed, the sufficient signal to noise ratio is provided for a baseband processing circuit, and the wide applied range is achieved.

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 an indoor cover automatic design optimizing system and a method thereof which includes: an interface input module, a Visio import module, a mathematical modeling and core calculating module, a data statistics module, a tablet output module and a Visio export module.

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 discloses a method for wireless terminal dynamically switching window in a wireless LAN environment. The wireless LAN comprises several access points and stations which establish wireless communication connections with the access points. The stations can switch the current access window by scanning. The method characterizes in that including following steps: giving the switching window an initial value through the stations; the stations judge if there is another access point of which the signal quality is greater than that of the current access window through scanning wireless channels; if so, further judge if the stations are in a frequently handoff status, if so, the handoff judging result is not allowed to switch window; if not, the handoff judging result is allowed to switch window. The present invention can adaptively adjust the stations' switch windows according to the stations' handoff status and frequently handoff status. On one hand, the invention avoids the occurring of frequently handoff by changing the handoff conditions of the stations, increasing the access efficiency of the stations which is in the handoff status and in a wireless LAN environment, while maintaining the sensitivity of the stations which is in the handoff status, ensuring the quality of the wireless links between the stations and the access points.

The invention discloses a channel switching method suitable for underground turn around and a vehicle wireless access point. The method includes steps as follows: confirming entering into a turn around region through BSSID for identifying turn around position AP through the vehicle AP, starting a channel switching of transmitting and receiving service when the wireless signal intension of the turn around position AP larger than or equal to a set field threshold that judgement for driving direction in the turn around course does not depend on CBTC or PIS system. The method can reduce coupling among systems, reduce development cost of CBTC and PIS, enlarge the usage range of the underground wireless communication system.

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.

Node equipment 1, having optical attenuator unit 21 for optically attenuating wavelength division multiplexing signals received and optical multiplexer / demultiplexer unit 5 for performing optical multiplexing / demultiplexing of the wavelength division multiplexing signals received from the optical attenuator unit 21 via an optical cord 11, includes: output level detecting unit 24 for detecting the optical power level of the wavelength division multiplexing signals at a pre-stage of the optical cord 11; input level detecting unit 52 for detecting the optical power level of the wavelength division multiplexing signals at a post-stage of the optical cord 11; deciding unit 25 for deciding abnormality of the optical power level loss through the optical cord 11 from the optical power levels detected by the output level detecting unit 24 and input level detecting unit 52; and control unit 26 for controlling the optical attenuation of the optical attenuator unit 21 according to the abnormality decision result by the deciding unit 25.

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.

The invention discloses a method for reducing influence of an AC coupling capacitor PAD on transmission of high-speed serial signals. An AC coupling capacitor additionally arranged on a high-speed serial bus is designed to be in small package so that the line width of a FDR bus passing through the capacitor can approximate the width of the PAD as much as possible to reduce sudden impedance change caused by change from a bonding pad of the capacitor to a transmission line body capacitor structure. Two-layer hollowing-out treatment is carried out on the FDR bus through the bonding pad of the AC coupling capacitor, so that the impedance of the FDR bus at the position of the AC coupling capacitor is kept unchanged, unnecessary reflection is avoided, the loss of a transmission line is reduced, and signal transmission stability is guaranteed.

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 embodiment of the invention provides an information transmitting and receiving switching method and a terminal, and belongs to the technical field of communications. The terminal comprises a firstantenna, a second antenna, and a control circuit which is connected with the first antenna and the second antenna, when a preset application is operated and the signal strength of a first network isgreater than a first preset threshold value, the control circuit controls the first antenna to serve as a main antenna of the first network and transmit and receive information through the first network and controls the second antenna to serve as a diversity receiving antenna of the first network and receive the information through the first network; and when the preset application is operated andthe signal strength of the first network is less than a second preset threshold value, the control circuit controls the second antenna to serve as a main antenna of the second network and transmit and receive the information through the second network. In the embodiment of the invention, when the signal strength of a current network for surfing is low, the network can be switched into another network to transmit and receive the information, so as to guarantee an operation effect of the preset application operated on the terminal.

The invention discloses a USB signal testing fixture. The USB signal testing fixture comprises a circuit board, wherein the circuit board is provided with a port facing upwards, a plurality of USB concentrator chips, a port facing downwards, a power supply port and a clock generator, wherein the port facing upwards is used for receiving an input signal, the USB concentrator chips are sequentially connected in series and are used for converting the input signal into a plurality of output signals which are the same as the input signal, the port facing downwards outputs the signals transmitted by the USB concentrator chips, the power supply port is used for providing equipment working voltage, and the clock generator is used for making a plurality of ICs work in the same timing sequence. Due to the fact that the integration of USB concentrators is achieved, USB signal testing fixture can conveniently and accurately measure the quality of USB signals after the USB signals are transmitted in a multi-stage mode.

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 high-density extendible KVM monitoring system, which belongs to the computer monitoring technology. A structure of the system comprises a control panel and controlled computers, wherein the control panel controls a plurality of controlled computers; each controlled computer is connected with a computer interface module; the controlled computers are connected with the computer interface modules through mouse cables, key cables and video cables; the plurality of computer interface modules are connected in series through super five category network cables to form controlled computer links, and each controlled computer link is connected to the control panel; a user monitors and operates the controlled computers through the control panel; and the control panel adopts high-speed switching technology and can extend n controlled computer links. Compared with the prior art, the high-density extendible KVM monitoring system integrates the multichannel switching technology into the user control panel seamlessly, so that the extendibility and signal quality of the system can be ensured better in narrow space.

High density mounting and power source sharing are achieved by a digital semiconductor element and an analog semiconductor element provided in a common semiconductor device. A power layer for analog operation is connected to one end of an EBG (Electromagnetic Band Gap) layer, a power layer for digital operation is connected to the other end of the EBG layer, ground terminals for the respective elements are connected to a common ground layer, and a ground layer for separating the power layer for analog operation and the EBG layer from each other is disposed between the power layer for analog operation and the EBG layer. Thereby, high density mounting is achieved along with reducing interference of the power source to an analog chip.

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.