92results about How to "Reduce transmission error rate" patented technology

The invention discloses a network coding cooperative communication method based on polarization codes, and belongs to the technical field of network coding. The method comprises the following steps of constructing a polarization code generation matrix GP, setting polarization code parameters N and K based on the number of relay nodes of the network and the number of users, and constructing a polarization code generation matrix GP again based on N and K, wherein N expresses the code length, K expresses the length of information bits, each column of the matrix GP corresponds to one relay node, and each row of the matrix GP corresponds to one user; receiving information sent by the users through the corresponding relay nodes based on the matrix GP; when the jth column and the ith row of the matrix GP are 1, receiving the information sent by the user corresponding to the ith row through the relay node corresponding to the jth column; carrying out binary domain addition on the received information by the relay nodes, and then sending the information to a receiving end; arranging the N received relay information rj in sequence by the receiving end to form a polarization codeword, and carrying out coding on the polarization codes. The method is used for the network coding, and can reduce transmission error rate and improve the network transmission stability.

The invention provides a precoding codebook selection and rotation modulation joint design method based on an MIMO-OFDM system, which comprises the steps of diffusing and distributing transmitted data onto different components through rotation modulation, leading the data of the different components to realize independent fading on respective signal channels so as to increase the advantages of signal space diversity, and further selecting the optimal rotation angle to obtain the maximum lift of the performances; and simultaneously introducing MIMO space diversity, time diversity and OFDM frequency diversity, as well as time-frequency interleaving diversity, thereby realizing gain caused by joint coding modulation diversity and effectively improving the performances of the system.

This invention provides a photoelectric mixed exchange structure supporting light burst / packet exchange, which takes optical exchange as the main thing and applies a buffer storage channel composed of a photoelectric converter, RAM buffer storage and an electro optical converter connected by electric field, takes electric-field buffer storage to replace light buffer storage (FDL) and adds with suitable electric-field exchange. This invention utilizes electric-field buffer storage to solve conflict effectively, which is the main reason for loosing data in optical network.

The invention provides a method and device for high-speed wired duplexing information communication between a well and the ground. The method comprises the steps of: collecting signals in the well by a sensor; modulating the collected signals by adopting a coding orthogonal frequency division multiplexing technology into OFDM (Orthogonal Frequency Division Multiplexing) signals; transmitting the signals to the ground by a basic structure unit consisting of a drill stem with cables and the like and further demodulating to obtain the collected signals in the well, thereby determining the underground temperature, pressure and fluid condition, formulating a drilling well completion strategy and forming a ground control instruction which is transmitted to an appointed position in the well by a transmission system. Compared with traditional like technologies, the system has the advantages of a large amount of transmittance data, high transmission speed, strong real-time property, two-way communication, high confidentiality and the like.

The invention discloses a method for adjusting parameters of an unmanned underwater vehicle processor. The parameters of an unmanned underwater vehicle can be dynamically adjusted during voyage in water by adopting the method. The method uses wireless communication, Beidou satellite communication and underwater sound communication for realizing dynamic adjustment for the parameters of the unmanned underwater vehicle processor, so that the condition that when a wired manner is adopted for parameter adjustment, the unmanned underwater vehicle must be frequently retracted and released, assembled and disassembled, and hardware must be frequently modified is avoided, therefore the efficiency is greatly improved, and the accident occurrence probability is reduced. The parameters designed in the method are few in number of bytes of frames and small in data size, so that the probability of transmission error caused by transmission data size is reduced, the parameter setting success rate is further improved, and in addition, parameter instructions carried by a parameter array are rich, so that the parameters of the unmanned underwater vehicle processor can be comprehensively adjusted according to the parameter array.

The invention discloses an anti-static, anti-corrosion, waterproof and stretching-resistant insulated cable. The anti-static, anti-corrosion, waterproof and stretching-resistant insulated cable comprises a cable body. The cable body comprises cable cores, a cable core protective layer, an insulating layer, a shielding layer and an outer jacket. The cross section of the cable core protective layer is of a circular structure, and the multiple evenly-arranged cable cores are arranged in the cable core protective layer and separated through PVC plastic connecting rods; a plurality of current guide cores are arranged outside the cable core protective layer and are tangent with the cable core protective layer; the insulating layer is arranged outside the cable core protective layer; waterproof fillers are arranged in a gap between the insulating layer and the cable core protective layer; the shielding layer is tightly extruded on the insulating layer and internally provided with the multiple evenly-arranged current guide cores; a breakdown resistant layer, a steel core protective layer and a waterproof layer are sequentially extruded on the shielding layer from inside to outside; an armor layer is extruded outside the waterproof layer, the outer jacket is arranged outside the armor layer, and a graphite layer is arranged between the armor layer and the outer jacket. The anti-static, anti-corrosion, waterproof and stretching-resistant insulated cable has the advantages of being reasonable in structural design, high in anti-static capacity, good in anti-corrosion performance and the like.

The invention provides a spaceborne multichannel ADS-B signal processing method. The method comprises the following steps: S1: performing message header detection on an AD sampling ADS-B signal according to a preset rate to obtain message header information and reference power; S2: performing bit demodulation and confidence coefficient demarcation of the ADS-B signal by using a baseline diversity technology based on the reference power; and S3: performing forceful CRC error correction on the demodulated bits according to the level of the demarcated confidence coefficient, and finally outputting an ADS-B1090ES message with a target bit number. By adoption of the method, the special demands of the ground ADS-B standard system application and the spaceborne multichannel application can be both considered; the real-time data processing ability is high, and the application demands of wide receiving coverage and numerous aircrafts within the area are satisfied; and the power adaption demand on the received signals is low, the sensitivity and the overlapping signal separation ability are good, and the transmission bit error rate is low.

The invention provides a cascade-collecting-station high-efficiency production line data transmission system used for seismic exploration, wherein two LVDS (low voltage differential signaling) interfaces are used in a master control station and are respectively connected to cross stations; four LVDS interfaces are used in each cross station, wherein an uplink interface is led to the master control station, a downlink interface is connected to the cross station of the next stage, a left side interface and a right side interface are respectively connected with collecting stations; two LVDS interfaces are used in each collecting station; and a high-speed data transmission technique based on a LVDS is used among the collecting stations, between each collecting station and each cross station and between each cross station and the master control station. The invention further provides a high-speed data transmission method based on the LVDS. The system and the method have the following advantage that hardware is directly driven by an FPGA (field programmable gate array) control logic based on the LVDS transmission technique, so that the requirement for high data ratio in a seismic exploration system can be satisfied; and the characteristics of simpler structure and low transmission error rate are achieved.

The invention discloses an adaptive adjustment and optimization method of link quality. For the link of a high-speed serial interface SerDes (Serialzer-Deserializer), the method adds PRBS (Pseudo Random Binary Sequence)-31 pseudo-random code generation / checkout into a de-emphasis balancing process of the high-speed serial interface, an error rate and temperature change are taken as the end judgment signs of DFE (Decision Feedback Equalization), and a fixed flow of high-speed SerDes link quality adjustment and optimization is formed. The method can effectively improve the transmission quality of the SerDes link, obviously lowers the transmission error rate so as to improve the transmission performance of a chip bus, is high in automation degree, and has the characteristics of high link adjustment and optimization speed, good effect and the like.

The invention relates to the fields of optical fiber communication and digital communication. Particularly, the invention relates to a method for aligning multichannel data based on a system synchronizing and reference channel. The method for aligning the multichannel data based on the system synchronizing and reference channel comprises the following steps: the transmitted multichannel data are basically synchronized by arranging a ''system synchronization'' signal; then ''reference channel'' data are arranged additionally, so that a read control module for aligning channels is unrelated with the data of the working channel.

The invention discloses a coal mine safety monitoring system, which comprises an upper part and an underground part. The upper part includes a power surge arrester sequentially connected to a power supply, a monitoring host and a standby monitoring host. The heartbeat machine is connected, the monitoring host is also connected with the uphole switch and the downhole switch in turn, and the monitoring host is also connected with the display, printer, large screen, and analog disk respectively; the downhole part includes At least one safety monitoring substation, the safety monitoring substation is respectively connected with the sensor, the breaker and the DC power supply. The invention can not only accurately and timely reflect downhole environmental parameters to achieve early prediction of disasters and necessary treatment of accidents, but also provide timely operation status of various equipment for production scheduling, thereby effectively directing production.

The embodiment of the invention discloses a control information transmission method, equipment and a communication system. The method comprises the following steps: determining a first scheduling wayfor performing uplink data scheduling at present for a terminal, wherein the first scheduling way includes self-scheduling or cross-carrier scheduling; monitoring a plurality of parameters in a wireless communication network; dynamically adjusting the first scheduling way according to a monitoring result of the plurality of parameters in the wireless communication network; transmitting control information carrying an adjusted scheduling way to the terminal; and subsequently performing uplink data scheduling for the terminal in the adjusted scheduling way. Through implementation of the controlinformation transmission method, the equipment and the communication system, the system performance can be enhanced.

The invention discloses a coal mine safety monitoring system. The system comprises system ground equipment and system underground equipment; the system ground equipment comprises a UPS, a defibrillator, a monitoring host machine, a monitoring standby machine and a ground network switch; and the ground network switch is connected with the system underground equipment through an optical fiber; an underground industrial ring network is provided with at least two underground ring network switches; the first underground ring network switch is connected into the input end of a first monitoring substation, and at the same time, a first power source box is connected into the input end of the first monitoring substation; the first monitoring substation is provided with four output ends; the secondunderground ring network switch is connected into the input end of a second monitoring substation, and at the same time, a second power source box is connected into the input end of the second monitoring substation; and the second monitoring substation is provided with four output ends. The coal mine safety monitoring system of the invention has the advantages of high working efficiency, stable product quality, reliable safety, accurate monitoring, simple structure and convenient maintenance.

A projector system includes a plurality of projectors, in which a projector A and a projector B, and the projector B and a projector C are connected by a daisy chain method via each of cables, and the projector A outputs control information which controls the projector B or the projector C to the projector B via a data line of the cable along with image data and the projector B extracts and processes the control information input from the data line of the cable.

A method for transmitting discrete multiaudio modulated data includes generating the first bit table by sending end according to data to be sent as the first bit table item containing data load information on each line at this time of data sending, modulating data according to the first bit table and sending modulated data to receiving end by sending end, carrying out demodulation according to the first bit table and obtaining relevant data by receiving end.

The invention discloses a PCIE (peripheral component interconnect express) based radar data acquisition displaying and controlling system and a method thereof. The PCIE based radar data acquisition displaying and controlling system comprises an upper computer module, a PCIE interface module, an FPGA (field programmable gate array) control module, an AD acquisition module and a storage module. The upper computer module is used for setting and processing parameters, sending and processing information and displaying images. The PCIE interface module is used for sending information and transmitting data between the upper computer module and the FPGA control module. The FPGA control module completes receiving and transmitting of the data and is responsible for controlling the modules. The AD acquisition module completes data acquisition. The storage module is used for storing the data. The method includes that the acquired data are transmitted to the upper computer module by means of a TLP (thread-level parallelism) data package and then drawn into an image to be displayed on a screen by means of a double buffer technique by the upper computer module according to set displaying parameters. The PCIE based radar data acquisition displaying and controlling system and the method thereof reduce system cost, increase data transmission rate and can be applied to a radar data acquisition system, particularly a system high in data transmission rate and strong in instantaneity.

The invention discloses a time-frequency estimation method of an OFDM (Orthogonal Frequency Division Multiplexing) structure of a satellite CMMB (China Mobile Multimedia Broadcasting) system, wherein a frequency domain pilot symbol and a time domain pilot symbol are orderly inserted into an original data symbol to form an OFDM symbol, and the OFDM symbol is transmitted as a transmission signal. By the time-frequency estimation method provided by the invention, the OFDM structure of the satellite CMMB system can simultaneously balance the multipath interference of the frequency domain and compensate the Doppler interference of the time domain, and solves the technical problem that the conventional system cannot simultaneously perform time domain channel estimation and frequency domain channel estimation in single channel estimation mode, so that the system has more optimal channel estimation precision, the effect of channel compensation and balancing is improved greatly, and finally, the transmission performance of the system in satellite multipath channel environment is improved remarkably.

The invention discloses a channel-sensing medium voltage power line communication data transmission method comprising the steps of 1, acquiring data information of the channel state of the medium voltage power line communication of specified N transmission cycles before a current transmission cycle at each transmission cycle, wherein the data information of the channel state of the medium voltagepower line communication comprises a plurality of state parameters; 2, comprehensively computing a channel quality assessment parameter of the medium voltage power line communication of the current transmission cycle by using the plurality of state parameters of the data information of the channel state of the medium voltage power line communication; 3, selecting a data transmission modulation mode of the current transmission cycle according to the channel quality assessment parameter; and 4, transmitting data according to the selected data transmission modulation mode. According to the methodprovided by the invention, data transmission efficiency of the medium voltage power line communication can be effectively improved, and a transmission error rate can be reduced.

The invention discloses a 4M transmission method of an orthogonal frequency division multiplexing (OFDM) structure of a satellite China mobile multimediabroadcasting (CMMB) system. According to the method, at a transmitting terminal, pilot frequency insertion, OFDM moulding and cyclic prefix insertion are carried out on a data subcarrier that has been coded and mapped and then the processed data subcarrier is sent to a receiving terminal; at the receiving terminal, cyclic prefix deletion, OFDM deframing, and pilot frequency deletion are correspondedly carried out on a received signal and then sent data are recovered by demapping and channel decoding processes. According to the invention, a balanced and eclectic optimized scheme is provided for a CMMB standard in aspects of a system data transmission rate and a frequency spectrum utilization rate, so that a technical problem of unbalanced functions in the aspects of a transmission rate and a frequency utilization rate in a traditional system is solved. Besides, a pilot frequency pattern arrangement mode is designed reasonably and optimized, so that the system has good channel estimation precision and a system transmission performance of a 4M mode in a satellite mobile multipath environment is also improved; moreover, a transmission mode of the OFDM structure of the CMMB system is expanded.

The invention relates to a joint beamforming and receiving end spatial modulation method based on an intelligent reflecting surface and a transmitting end. According to the method, the beamforming of the transmitting end and an intelligent reflecting surface angle are optimally designed based on the maximum system receiving signal-to-noise ratio. A greedy detection scheme and a maximum likelihood detection scheme based on exhaustive search are given according to two conditions of continuous phase shift and discrete phase shift of the intelligent reflecting surface. According to the method provided by the invention, spatial modulation is utilized, the problem of inter-channel interference in multi-antenna transmission is effectively avoided, spatial domain resources are fully utilized, and an effective data transmission rate is provided. In addition, joint beam forming on the transmitting end and the intelligent reflecting surface is used, so that the signal quality is improved, and reliable communication is ensured.

The invention relates to a bus cable used for a building intelligent control system and is characterized in that the bus cable has a four-core structure, wherein the cable core is formed by twisting two wire pairs (red-black and yellow-white pairs); the cable comprises, from the inside to the outside, a conductor, a high-density polyethylene insulating inner protective layer and an outer jacket layer; one of the two wire pairs is used to transmit a DC 24 V power to the system and digital signals as well and the other one is the spare pair; the bus cable is adapted to the on-off, control, monitoring and signal information transmission of buildings; the data transmission rate of the bus cable is more than or equal to 960KB / S; and the rated voltage of the bus cable is 0.6 / 1kV. The inventive bus cable used for the control system is safe and reliable to serve as the power line for digital control lines.

The invention discloses a transformer impact monitoring device, which relates to the field of transformer monitoring, and solves the problem that transformer impact monitoring and impact data recording cannot be accurately carried out in the prior art. The device comprises a signal conversion module for acquiring an analog signal output by a transformer PT / CT and isolating and converting the analog signal into a low-voltage analog signal; an input module used for acquiring a switching value signal of a circuit breaker in the transformer and carrying out optical coupling isolation and level conversion; an output module used for outputting four paths of relay empty node alarm signals to the outside; an acquisition module used for carrying out high-speed synchronous sampling on the low-voltage analog signal and the switching value signal, marking a timestamp accurate to microsecond on the sampled data, and outputting the acquired data in a network giant frame form; and a management module used for carrying out transformer impact event judgment according to the acquired data and carrying out impact data management according to a judgment result; wherein the signal conversion module, the input module and the output module are connected with the acquisition module, and the acquisition module is connected with the management module.

The invention discloses a high voltage breaker monitoring system and method thereof, aiming at providing a high voltage breaker monitoring system and method for remote information receipt, operating status checking and operating parameter setting through communication equipment and solving the inconvenient operation maintenance of current equipment. The keys of technical scheme include on-site monitor and communication module. The on-site monitor receives the operating data of signal acquisition bus connected on the high voltage breaker and performs real-time monitoring for acquired operating data;the communication module connects mobile client through wireless channel and also on-site monitor to send the acquired operating data to the mobile client; and the mobile client has multiple function menus: data inquiry to inquire and display the operating data of real-time monitoring; equipment configuration to set up the operating parameters of equipment; and system setup to set up the operating parameters of system.

The invention belongs to the technical field of wireless communication, and discloses an MIMO (Multiple-Input Multiple-Output)-OFDM (Orthogonal Frequency Division Multiplexing)-CDMA (Code Division Multiple Access) spread spectrum method combined with selected mapping. The method comprises the steps of respectively performing constellation mapping, serial-parallel conversion and spread spectrum processing on information of each user, and then adding the information together to serve as an original frequency domain signal; selecting a variety of spread spectrum codes to serve as alternative sequences in a phase sequence generator, multiplying the alternative sequences with the original frequency domain signal to perform phase rotation on different subcarriers, respectively performing an IFFT(Inverse Fast Fourier Transform) operation after multi-channel transformation, and selecting the minimum PAPR (Peak to Average Power Ratio) to serve as a transmission time domain signal; performing FFT and signal combination on received signals to obtain a frequency domain signal after the phase rotation sequence; and restoring the user information according to sideband information, and de-spreading and restoring the signal through spread spectrum codes of different user information. The method disclosed by the invention improves the flexibility of the phase selection sequence, and is greatlyimproved on the aspects of peak-to-average ratio and bit error rate.

The invention discloses an RFSoC-based SAR imaging real-time signal processing device. The device comprises an RF conversion unit, a clock unit, a program loading unit, an Ethernet interface unit, aninternal cache unit, a wave control interface unit and an RFSoC unit. The RF conversion unit is connected with the RFSoC unit through a differential interface; the clock unit is connected with the RFSoC unit through a low-voltage differential interface; the program loading unit is connected with the RFSoC unit through a bus interface; the Ethernet interface unit is connected with the RFSoC unit through a link port; the internal cache unit is connected with the RFSoC unit through a bus interface; and the wave control interface unit is connected with the RFSoC unit through a serial interface anda bus interface. The device has the advantages of being small in size, high in sampling rate, high in reliability, low in power consumption and high in stability.

The invention discloses a visible light and radio frequency hybrid communication method based on energy collection. The visible light and radio frequency hybrid communication method comprises the steps that lighting equipment transmits visible light information and energy to a user capable of receiving the light of the lighting equipment at the same time, and the user collects the visible light energy and carries out the information decoding, thereby obtaining the data transmission interruption probability of a visible light communication process; the total visible light power collected by theindoor user from a plurality of covered lighting devices is calculated, and the communication mode of radio frequency transmission from the indoor user to the outdoor is judged; the indoor user transmits the information to be transmitted to the outdoor user by using a point-to-point radio frequency communication technology; or the indoor user carries the information to be transmitted to the radiofrequency signal in the environment where the indoor user is located through the backscattering technology and then transmits the information to the outdoor user through backscattering; and a data transmission outage probability using the traditional radio frequency communication mode and the backscatter communication mode respectively is obtained through calculation, thereby finishing the communication. According to the visible light and radio frequency hybrid communication method, the problems of radio frequency spectrum resource shortage and interference between radio frequency transmission systems are alleviated, and the transmission rate is improved.

The invention discloses a filtering method for processing transponder uplink signals. The filtering method distinguishes a ''point-passing'' moment and a ''non-point-passing'' moment through identifying characteristic frequency, acquires a noise signal at the ''non-point-passing'' moment to obtain filtering algorithm related parameters, and obtains a denoised uplink signal through the filtering algorithm at the ''point-passing'' moment and the filtering algorithm related parameters at the ''non-point-passing'' moment. The filtering method has the advantages of reducing interference of spatial stray electromagnetic waves, a traction motor and a passing neutral section on the transponder uplink signals, improving signal-to-noise ratio of the signals, reducing transmission bit error rate, improving vehicle-ground signal transmission reliability, and improving the train operation efficiency.

The invention discloses a router based on client complex application. The router comprises an acquisition module, an establishing application corresponding table module, a storage module, an enquiry module, an establishing link module, a selection and communication link module, and a sending module. The router is used for transmitting data flow without limiting by fixed IP, port and protocol, can establish link transmission data flow based on the complex application of the client, and detects whether application type corresponding to the data flow acquired by the enquiry module is successful via a detection module; and a judge module is used for judging whether the transmission link of the selection and communication module is the same as the link of a practical communication link or not. Therefore, the error ratio and the interference ratio of the transmission of the router are lowered, the forwarding efficiency of the router is improved, and emergency control of a wideband is ensured.

The invention discloses a signal transmission system for realizing automatic error correction for code errors. The signal transmission system for implementing automatic error correction for code errors includes a signal transmitting module and a signal receiving module, and the signal transmitting module includes an RS encoder for performing RS encoding on a signal and an RS encoder for performing RS encoding on a signal. An interleaving code encoder for performing interleaving encoding on signals; the signal receiving module includes an interleaving code decoder for interleaving code decoding of signals transmitted by the interleaving code encoder and RS for signals transmitted by the interleaving code decoder decoded RS decoder. The invention has the beneficial effects of reducing the error rate of signal transmission and improving the efficiency of signal transmission.