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52results about How to "Sync frequency" patented technology
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Device and method for synchronizing system frequency in packet transport network
ActiveCN102904706APacket transfer implementationFrequency synchronizationSynchronising arrangementSynchronizerPhase locked loop circuit
The invention discloses a device and a method for synchronizing system frequency in a packet transport network, and relates to a packet transport network in optical communication. The system frequency synchronizing device comprises a microcomputer processor, a field programmable gate array (FPGA) processing module, a clock integrated circuit, a packet transport network service disk, a synchronous state byte extracting module, a synchronous state byte generating module, a phase locked loop circuit, an external clock input circuit, a high stable crystal oscillator, a clock distributing circuit, a HDB3 coding module and an external clock output circuit, wherein the FPGA processing module comprises a preceding stage preselector, a priority level control module, a first selector, a second selector and a third selector. By the device and method, the system frequency in the whole packet transport network can be synchronized rapidly, data business package transmission and smooth transition can be carried out rapidly and hierarchically, and the device is flexible and has high reliability.
Owner:FENGHUO COMM SCI & TECH CO LTD
New OFDM time, frequency synchronization method
InactiveCN1494242AReduce distractionsReduce transmission efficiencyOrthogonal multiplexMultiple carrier systemsOriginal dataGuard interval
Weighted addition in point to point between data at back Ng points in OFDM original data and training sequence at transmitting end of OFDM system constitutes guard gap. OFDM original data is unchanged. Fusion algorithm is utilized in the receiving end of OFDM system. Correlativity between data in guard gap and data at back Ng points in OFDM original data as well as correlativity induced by the training sequence are utilized synthetically to process the received data for realizing time and frequency synchronism. The invention makes OFDM system possess good synchronous performance as well as has advantages of small interference on data caused by training sequence.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Synchronization method and apparatus
ActiveCN109412764ASynchronization frequencySync frequencySynchronisation arrangementTransmission path divisionData transmissionFrequency offset
The invention provides a synchronization method and apparatus. The method comprises the following steps: first UE maps data to be transmitted and a first sequence onto symbols in a first time unit toobtain a first signal. The first sequence is mapped onto at least one symbol of a non-starting location in the first time unit, and the first UE sends the first signal to second UE. The second UE receives the first signal, obtains a first sequence, and synchronizes the first signal according to the first sequence. By transmitting the first sequence for synchronization on the symbols of the non-starting portion of each data transmission, when the CP length of the symbol for sending the data cannot meet the time synchronization requirement, a receiving end device can still use the first sequenceto perform time synchronization on the currently received data, and meanwhile use a CP structure to perform frequency offset estimation to achieve frequency synchronization.
Owner:HUAWEI TECH CO LTD
Wireless communication method
ActiveCN107835052AAddress reliabilityAchieve large capacityTime-division multiplexRadio-over-fibreTransceiverSynchronous control
The embodiment of the invention relates to a wireless communication method. The method includes the following steps: a first array of optical fibers transmit a first signal optical signal; an opticalsplitter splits the first signal optical signal to obtain multiple paths of identical first branching optical signals; multiple wireless communication nodes synchronously generate the same first pulsesignal, and thus each wireless communication node in a wireless communication array simultaneously and synchronously sends the first pulse signals; a synchronization controller generates a receivingcontrol instruction, and sends the receiving control instruction to a current wireless signal transceiver node through a first signal optical fiber and a first passive optical branching device; the current wireless signal transceiver node receives the first pulse signals simultaneously sent by the multiple wireless communication nodes in the wireless communication array to generate a first communication optical signal; and a second passive optical branching device receives the first communication optical signal sent by the corresponding wireless signal transceiver node and sends the first communication optical signal to a second signal optical fiber.
Owner:BEIJING PHOENIX HUITONG TECH CO LTD +1
A single frequency network anti-noise mobile multimedia broadcast signal framing modulation method
InactiveCN102263744AOrthogonalDoes not destroy the orthogonalityError preventionMulti-frequency code systemsTime domainControllability
The invention discloses a noise-resistance framing modulation method for mobile multi-media broadcast signals of a single frequency network, which is a time domain, frequency domain and space domain hybrid framing modulation scheme. The method has the advantages of low peak-to-average power ratio, short synchronous time, robustness, controllability in multiple services and the like.
Owner:蔡春艳
Wireless communication system
ActiveCN107528609AAddress reliabilitySolve communication bandwidthNear-field transmissionWireless commuication servicesVIT signalsWireless signal
The invention relates to a wireless communication system, comprising a wireless communication array and a wireless signal transmit-receive chain. The wireless communication array comprises a first array fiber, an optical branching device, and a plurality of wireless communication nodes. The first array fiber transmits a first signal optical signal. The optical branching device conducts branching on the first signal optical signal, obtaining a branching optical signal. The wireless communication node simultaneously and synchronously sends a first pulse signal. The wireless signal transmit-receive chain comprises a synchronizing controller, a first signal fiber, a plurality of first passive optical branching devices, a plurality of wireless signal transmit-receive nodes, a plurality of second passive optical branching devices, and a second signal fiber. The synchronizing controller generates a receiving and controlling instruction and sends it to the wireless signal transmit-receive node, which generates a first communication optical signal based on the first pulse signal.
Owner:BEIJING PHOENIX HUITONG TECH CO LTD +1
Anti-interference wireless multimedia broadcast signal framing modulation method for single frequency network
InactiveCN102244638ADoes not destroy the orthogonalityEasy to handleMulti-frequency code systemsTime domainControllability
The invention discloses an anti-interference wireless multimedia broadcast signal framing modulation method for a single frequency network, which is a time domain / frequency domain / space domain hybrid framing modulation scheme. The anti-interference wireless multimedia broadcast signal framing modulation method for the single frequency network has the advantages of low peak-to-average power ratio, short synchronization time, anti-channel interference performance, multi-service controllability and the like.
Owner:NINGBO UNIV
Wireless communication device and wireless communication array
ActiveCN107786962AAddress reliabilityIncrease capacityParticular environment based servicesSynchronisation by photonic/optical meansNetwork Communication ProtocolsOptical communication
The embodiment of the invention relates to a wireless communication device. The wireless communication device comprises a photoelectric converter, a frequency generator, a modulator, a power amplifierand an antenna; the photoelectric converter receives a shunting light signal sent by an optical splitter, converting the shunting light signal into a first electrical signal and sending the first electrical signal to the modulator; the frequency generator generates a frequency signal and sends the first electric signal to the modulator; the modulator modulates the first electric signal into a frequency signal to generate a first driving signal, and sends the first driving signal to the power amplifier; the power amplifier amplifies the first driving signal to generate an amplified first driving signal; the antenna sends a first pulse signal according to the amplified first driving signal, and the first pulse signal is used for being received by a wireless signal transceiving device. According to the wireless communication device, the millimeter wave communication technology and the optical communication technology are combined, and a special communication protocol is used for achieving high-capacity and high-reliability data communication of a train under a high-speed moving condition.
Owner:BEIJING PHOENIX HUITONG TECH CO LTD +1
Method for framing modulation of anti-noise wireless multimedia broadcast signals of single-frequency network
InactiveCN102255848AOrthogonalDoes not destroy the orthogonalityError preventionMulti-frequency code systemsSingle-frequency networkVIT signals
The invention discloses a method for framing modulation of anti-noise wireless multimedia broadcast signals of a single-frequency network, relating to a time domain-frequency domain-spatial domain hybrid framing modulation scheme. The method for the framing modulation of the anti-noise wireless multimedia broadcast signals of the single-frequency network has the advantages of low peak-to-average power ratio, short synchronization time, channel fading resistance, multi-service controllability, and the like.
Owner:白晓燕
Punching device for strip-shaped material strip
The invention provides a punching device for a strip-shaped material strip. Through the punching device, it can be guaranteed that a punching arm of a punching machine and a stepping motor of a feeding clamping mechanism are synchronous in frequency. The punching device comprises the punching arm and a punching die set connected with the lower portion of the punching arm. The die set is provided with a die pressing area. The die pressing area is connected with a feeding device in the feeding direction. The feeding device comprises a feeding track and feeding clamping mechanisms. The feeding clamping mechanisms are arranged on the two sides of the feeding track and driven through the stepping motor. The punching arm is fixedly connected with a synchronous drive arm. The stepping motor is provided with a rocker type switch. The rocker suspension end of the rocker type switch is located in the stroke of the synchronous drive arm. According to the punching device, it can be guaranteed that the punching arm and the stepping motor of the feeding clamping mechanisms are synchronous in frequency, accordingly the error of the feeding distance in the punching process is reduced, the precision of the feeding distance is guaranteed, and material waste is avoided.
Owner:XINYI HUAYU ELECTRONICS TECH CO LTD
Robust wireless multi-media radio signal framing modulation method
InactiveCN103780539AReduce the amount of informationPromote recoveryError preventionMulti-frequency code systemsTime domainComputer science
The invention discloses a robust wireless multi-media radio signal framing modulation method which is a framing modulation scheme with the time domain and the frequency domain mixed. According to the robust wireless multi-media radio signal framing modulation method, cascading interleaving coding modulation, training sequence optimization design, a signal generation mode and a signal selection method are adopted, and therefore original signals of OFDM signals can be easily processed, recovered and obtained at a receiver end. The robust wireless multi-media radio signal framing modulation method has the advantages that the peak-to-average power ratio is low, the synchronization time is short, channel fading is resisted, and multiple services can be controlled.
Owner:NINGBO UNIV
Wireless signal transmit-receive apparatus and wireless signal transmit-receive chain
ActiveCN107528610AAddress reliabilityIncrease capacityNear-field transmissionWireless commuication servicesLow noiseAudio power amplifier
The invention relates to a wireless signal transmit-receive apparatus, comprising an antenna, a low noise amplifier, a mixer, a frequency generator, an amplitude limit amplifier, a modulator and a photoelectric converter. The antenna is used for receiving a pulse signal. The low noise amplifier is used for conducting low noise amplification on the pulse signal received by the antenna, and generating processing pulse signal and sending to the mixer. The frequency generator is used for generating a frequency signal and sending it to the mixer. The mixer processes the frequency signal into communication electric signal based on the processing pulse signal. The amplitude limit amplifier is used for conducting amplitude limit amplification on the communication electric signal, and generating amplification electric signal. The modulator is used for conducting protocol transition on the amplification electric signal and generating electric signal. The photoelectric converter is used for converting the electric signal to the optical signal, and sending the optical signal to an optical receiver. The invention is advantageous in that millimeter wave communication technology and optical communication technology are combined, and the special-purpose communication protocol is adopted to achieve vehicle-earth large-capacity and high-reliability data communication of trains under condition of high-speed movement.
Owner:BEIJING PHOENIX HUITONG TECH CO LTD +1
Mobile digital broadcasting signal transmission method
InactiveCN103780562AReduce peak-to-average power ratioReduce the amount of informationError preventionMulti-frequency code systemsTime domainDigital broadcasting
Owner:NINGBO UNIV
Anti-noise mobile signal transmission method for digital broadcast
InactiveCN103763267AReduce the amount of informationDoes not destroy the orthogonalityError preventionMulti-frequency code systemsVIT signalsFrequency domain
The invention discloses an anti-noise mobile signal transmission method for a digital broadcast, and relates to a mixed framing modulation scheme of the time domain and the frequency domain. According to the training sequence optimization design, the signal generating scheme and the signal selecting method of the anti-noise mobile signal transmission method for the digital broadcast, OFDM signals can be processed and recovered at a receiver end easily to obtain original signals of the OFDM signals. The anti-noise mobile signal transmission method for the digital broadcast has the advantages of being low in peak-to-average power ratio, short in synchronization time, resistant to channel fading, multiple in controllable service and the like.
Owner:NINGBO UNIV
Framing modulation method for robust multi-media wireless broadcast signals
InactiveCN103763239AReduce the amount of informationPromote recoveryError preventionMulti-frequency code systemsTime domainWireless broadcast
The invention discloses a framing modulation method for robust multi-media wireless broadcast signals. The method is a framing modulation scheme with time domain and frequency domain mixed. According to the framing modulation method for the robust multi-media wireless broadcast signals, cascade interleaving code modulation is performed, training sequence optimization design is performed, signal generating modes are implemented, and a signal selecting method is implemented, so that original signals of OFDM signals are easy to obtain through processing and recovering at a receiver terminal, and the framing modulation method has the advantages of being low in peak-to-average power ratio, short in synchronization time and resistant to channel fading and providing multiple controllable services.
Owner:NINGBO UNIV
Anti-interference transmission method for wireless digital radio signals
InactiveCN103763257AReduce the amount of informationPromote recoveryMulti-frequency code systemsTime domainDigital radio
The invention discloses an anti-interference transmission method for wireless digital radio signals and relates to a framing modulation scheme for mixing a time domain and a frequency domain. The anti-interference transmission method for the wireless digital radio signals comprises the steps of training sequence optimization design, signal generation pattern selection and signal selection. In this way, original signals of OFDM signals can be easily obtained through processing and restoring at a receiver end. Besides, the anti-interference transmission method for the wireless digital radio signals has the advantages that the peak-to-average power ratio is low, synchronization time is short, channel fading is resisted, and multiple services can be controlled.
Owner:NINGBO UNIV
Wireless signal transceiver device and wireless signal transceiver chain
ActiveCN107528610BAddress reliabilityIncrease capacityNear-field transmissionShort range communication serviceLow noiseConverters
The embodiment of the present invention relates to a wireless signal transceiver device, which includes: an antenna, a low-noise amplifier, a mixer, a frequency generator, a limiting amplifier, a modulator and a photoelectric converter; the antenna is used to receive pulse signals; the low-noise amplifier is used to It performs low-noise amplification processing on the pulse signal received by the antenna to generate a processed pulse signal and sends it to the mixer; the frequency generator is used to generate a frequency signal and sends it to the mixer; the mixer processes the frequency signal into Communication electrical signals; the limiting amplifier is used to limit and amplify the communication electrical signals to generate an amplified electrical signal; the modulator is used to convert the amplified electrical signal into a protocol to generate an electrical signal; the photoelectric converter is used to convert the electrical signal into an optical signal. sent to the optical receiver. The invention combines millimeter wave communication technology and optical communication technology, and uses a dedicated communication protocol to realize large-capacity and highly reliable data communication between the train and the ground under high-speed moving conditions.
Owner:BEIJING PHOENIX HUITONG TECH CO LTD +1
Framing modulation method for multimedia wireless broadcast signals
InactiveCN103763244AReduce the amount of informationDoes not destroy the orthogonalityError preventionMulti-frequency code systemsFrequency domainPower ratio
The invention discloses a framing modulation method for multimedia wireless broadcast signals, and relates to a mixed framing modulation scheme of the time domain and the frequency domain. According to the training sequence optimization design, the signal generating scheme and the signal selecting method of the framing modulation method for the multimedia wireless broadcast signals, OFDM signals can be processed and recovered at a receiver end easily to obtain original signals of the OFDM signals. The framing modulation method for the multimedia wireless broadcast signals has the advantages of being low in peak-to-average power ratio, short in synchronization time, resistant to channel fading, multiple in controllable service and the like.
Owner:NINGBO UNIV
Digital broadcasting mobile signal anti-fading transmission method
InactiveCN103780535AReduce the amount of informationPromote recoveryError preventionMulti-frequency code systemsVIT signalsEngineering
The invention discloses a digital broadcasting mobile signal anti-fading transmission method which is a time domain and frequency domain mixed type framing modulation scheme. According to the training sequence optimization design, signal generation mode and signal selection method of the digital broadcasting mobile signal anti-fading transmission method of the invention, original signals of OFDM signals can be easily processed, recovered and obtained at the receiver side, so advantages, such as low peak-to-average power ratio, short synchronization time, good channel anti-fading performance, multi-service controllability etc., can be realized.
Owner:NINGBO UNIV
Robust mobile signal transmission method for digital broadcast
InactiveCN103763266AReduce the amount of informationPromote recoveryError preventionMulti-frequency code systemsTime domainDigital broadcasting
The invention discloses a robust mobile signal transmission method for a digital broadcast, and relates to a mixed framing modulation scheme of the time domain and the frequency domain. According to the training sequence optimization design, the signal generating scheme and the signal selecting method of the robust mobile signal transmission method for the digital broadcast, OFDM signals can be processed and recovered at a receiver end easily to obtain original signals of the OFDM signals. The robust mobile signal transmission method for the digital broadcast has the advantages of being low in peak-to-average power ratio, short in synchronization time, resistant to channel fading, multiple in controllable service and the like.
Owner:NINGBO UNIV
Noise-resistance framing modulation method for mobile multi-media broadcast signals of single frequency network
InactiveCN102263744BOrthogonalDoes not destroy the orthogonalityError preventionMulti-frequency code systemsTime domainControllability
The invention discloses a noise-resistance framing modulation method for mobile multi-media broadcast signals of a single frequency network, which is a time domain, frequency domain and space domain hybrid framing modulation scheme. The method has the advantages of low peak-to-average power ratio, short synchronous time, robustness, controllability in multiple services and the like.
Owner:蔡春艳
Transmission method of anti-fading mobile digital broadcasting signals
InactiveCN103780544AReduce peak-to-average power ratioReduce the amount of informationError preventionMulti-frequency code systemsTime domainDigital broadcasting
The invention discloses a transmission method of anti-fading mobile digital broadcasting signals. The transmission method is a framing modulation scheme with time domains and frequency domains being mixed. By means of the training sequence optimization design, the signal generating models and a signal selection method of the transmission method of the anti-fading mobile digital broadcasting signals, original signals of OFDM signals can be easily obtained at a receiver end through processing and restoring, and the transmission method has the advantages of being low in PAPR, short in synchronization time, channel fading resistant, capable of controlling multiple services, and the like.
Owner:NINGBO UNIV
Wireless signal anti-noise framing modulation method in multimedia broadcasting
InactiveCN103780537AReduce the amount of informationDoes not destroy the orthogonalityError preventionMulti-frequency code systemsVIT signalsFrequency domain
The invention discloses a wireless signal anti-noise framing modulation method in multimedia broadcasting. The wireless signal anti-noise framing modulation method in multimedia broadcasting is a framing modulation scheme of mixed time domains and frequency domains, comprises a coding mode, a training sequence optimized design, a signal generation mode and a signal selection method, obtains original signals of OFDM signals easily at a receiver end through processing and recovery, and has the advantages of being low peak-to-average power ratio, short in synchronization time, resistant to channel fading, controllable in multiple service and the like.
Owner:NINGBO UNIV
Movable signal anti-noise framing modulation method in multimedia broadcasting
InactiveCN103780558AReduce the amount of informationDoes not destroy the orthogonalityError preventionMulti-frequency code systemsTime domainComputer science
The invention discloses a movable signal anti-noise framing modulation method in multimedia broadcasting. The movable signal anti-noise framing modulation method in multimedia broadcasting is a framing modulation scheme of mixed time domains and frequency domains, comprises a coding method, a training sequence optimized design, a signal generation mode and a signal selection method, obtains original signals of OFDM signals easily at a receiver end through processing and recovery, and has the advantages of being low peak-to-average power ratio, short in synchronization time, resistant to channel fading, controllable in multiple service and the like.
Owner:NINGBO UNIV
Anti-fading framing modulation method for wireless signals of multimedia broadcast
InactiveCN103763274AReduce the amount of informationPromote recoveryError preventionMulti-frequency code systemsTime domainComputer science
The invention discloses an anti-fading framing modulation method for wireless signals of a multimedia broadcast, and relates to a mixed framing modulation scheme of the time domain and the frequency domain. According to the cascade interleaved coded modulation, the training sequence optimization design, the signal generating scheme and the signal selecting method of the anti-fading framing modulation method for the wireless signals of the multimedia broadcast, OFDM signals can be processed and recovered at a receiver end easily to obtain original signals of the OFDM signals. The anti-fading framing modulation method for the wireless signals of the multimedia broadcast has the advantages of being low in peak-to-average power ratio, short in synchronization time, resistant to channel fading, multiple in controllable service and the like.
Owner:NINGBO UNIV
Synchronous operation set
InactiveCN100397198CSimple designImprove ripple phenomenonStatic indicating devicesNon-linear opticsControl signalVoltage drop
A synchronous operation device consists of light tube, natural vibration converting circuit, sampling and frequency generating circuit, detection and feedback circuit, adjusting circuit and voltage dropping circuit. It is featured as sampling natural vibration frequency by preset sampling point in natural vibration converting circuit or by preset sampling point of said converting circuit and voltage dropping circuit to make control signal outputted from adjusting circuit synchronize to natural vibration frequency for improving ripple phenomenon of high voltage output.
Owner:BEYOND INNOVATION TECH
wireless communication system
ActiveCN107528609BAddress reliabilitySolve communication bandwidthNear-field transmissionShort range communication serviceCommunications systemEngineering
The embodiment of the present invention relates to a wireless communication system, including: a wireless communication array and a wireless signal transceiver chain; the wireless communication array includes: a first array of optical fibers, an optical splitter and a plurality of wireless communication nodes; the first array The optical fiber transmits the first optical signal; the optical splitter splits the first optical signal to obtain a split optical signal; the wireless communication node simultaneously sends the first pulse signal synchronously; the wireless signal transceiver chain includes: a synchronization controller, A first signal optical fiber, a plurality of first passive optical branches, a plurality of wireless signal transceiver nodes, a plurality of second passive optical branches, and a second signal optical fiber; the synchronization controller generates a receiving control instruction and sends it to the current wireless signal Transceiver node; the current wireless signal transceiver node generates a first communication optical signal according to the first pulse signal.
Owner:BEIJING PHOENIX HUITONG TECH CO LTD +1
Anti-interference mobile signal transmission method for digital broadcast
InactiveCN103763265AReduce the amount of informationPromote recoveryMulti-frequency code systemsTime domainDigital radio
The invention discloses an anti-interference mobile signal transmission method for a digital broadcast, and relates to a mixed framing modulation scheme of the time domain and the frequency domain. According to the training sequence optimization design, the signal generating scheme and the signal selecting method of the anti-interference mobile signal transmission method for the digital broadcast, OFDM signals can be processed and recovered at a receiver end easily to obtain original signals of the OFDM signals. The anti-interference mobile signal transmission method for the digital broadcast has the advantages of being low in peak-to-average power ratio, short in synchronization time, resistant to channel fading, multiple in controllable service and the like.
Owner:NINGBO UNIV
CPRI-based data transmission method, apparatus and device, and storage medium
ActiveCN114567927ASolve technical problems with complex processesSync frequencySynchronisation arrangementTime-division multiplexData controlPhysical layer
The invention discloses a CPRI-based data transmission method, apparatus and device, and a storage medium. The method comprises the steps of receiving user plane data, control plane data, management plane data and synchronous clock data; mapping the user plane data, the control plane data, the management plane data and the synchronous clock data into a CPRI frame; and sending the CPRI frame to an O-RAN radio frequency unit through a first serial deserializer, so that the O-RAN radio frequency unit receives the CPRI frame through a second serial deserializer, analyzes the CPRI frame, analyzes user plane data, control plane data, management plane data and synchronization plane data from the CPRI frame, and sends the user plane data, the control plane data, the management plane data and the synchronization plane data to the O-RAN radio frequency unit. And sending the user plane data, the control plane data, the management plane data and the synchronization plane data to a second physical layer for processing. According to the invention, the technical problem that the data transmission process of the existing 5G technology forward transmission interface is complex is solved.
Owner:广东世炬网络科技有限公司
wireless communication method
ActiveCN107835052BAddress reliabilityAchieve large capacityTime-division multiplexRadio-over-fibreTransceiverEngineering
Owner:BEIJING PHOENIX HUITONG TECH CO LTD +1
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