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33 results about "Carrier shift" patented technology
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In telecommunication, the term carrier shift has the following meanings: In the transmission of binary or teletypewriter signals, keying in which the carrier frequency is shifted in one direction for marking signals and in the opposite direction for spacing signals. In amplitude modulation, a condition that results from imperfect modulation in which the positive and negative excursions of the modulating envelope are unequal in amplitude. Note 1: The carrier shift results in a change in carrier power. Note 2: The carrier shift may be a shift to a higher or to a lower frequency. This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".
Signal processing apparatus, signal processing method, and reception system
ActiveUS20110013729A1Required accuracyEstimating the carrier shift amount quicklyAmplitude-modulated carrier systemsPhase-modulated carrier systemsCarrier signalCarrier shift
Disclosed herein is a signal processing apparatus including a processing block configured to perform a carrier shift amount detection process for detecting a carrier shift amount constituting a carrier error used for demodulating an orthogonal frequency division multiplexing signal known as the OFDM signal; and a correction block configured to correct the OFDM signal in accordance with the carrier shift amount. The OFDM signal includes a first preamble signal including subcarriers, and a second preamble signal including subcarriers of which the spacing is narrower than the spacing of the subcarriers included in the first preamble signal. The second preamble signal includes pilot signals which are known signals located at intervals of a predetermined number of subcarriers. The processing block detects the carrier shift amount using a correlation of the subcarriers included in one such second preamble signal.
Owner:SATURN LICENSING LLC
Carrier
InactiveCN104228985AImprove transportation efficiencySafety devices for lifting equipmentsVehicle body stabilisationCarrier shiftEngineering
A carrier including a body and a gravity modulating module disposed at the body is provided. The gravity modulating module includes a weight block, a tilting sensing assembly and a driver. The tilting sensing assembly is adapted for sensing the tilting condition of the body and sending a left turning signal or a right turning signal. The driver is adapted to move the weight block according to the left turning signal or the right turning signal, so that the center of gravity of the carrier shifts to keep balance.
Owner:CAL COMP ELECTRONICS
Signal processing apparatus, signal processing method, and reception system
ActiveUS8358722B2Improve accuracyAmount quicklyAmplitude-modulated carrier systemsPhase-modulated carrier systemsCarrier shiftCarrier signal
Owner:SATURN LICENSING LLC
Digital broadcast receiver, mobile terminal and channel search method
InactiveUS20070274405A1Improve accuracyQuick and highly accurate channel searchTelevision system detailsPicture reproducers using cathode ray tubesCarrier shiftCarrier signal
A tuner selects a channel in a designated frequency band. An FFT circuit converts a received signal in the selected channel into a plurality of carrier signals. A carrier shift detection circuit calculates the correlation between the phase information of each carrier signal and reference phase information prepared in advance. If the correlation is larger than a given threshold, it is determined that an OFDM signal is present in the search target channel. A TMCC extraction circuit analyzes the TMCC of the received signal and determines whether or not digital broadcasts of the search target channel can be received.
Owner:SOCIONEXT INC
Fast capturing method for GNSS code
InactiveCN103605141ARemove frequency differenceAvoid lossSatellite radio beaconingPhase shiftedCarrier shift
The invention discloses a fast capturing method for a GNSS code. The fast capturing method mainly includes the steps that a code phase shift threshold and a carrier shift threshold are set in advance, a GNSS long code in a satellite signal and local pseudo code signals with different code phase shifts are subject to relevant processing, relevant results are subject to one-dimensional searching by a receiver, a correlation value is compared with the code phase shift threshold to acquire a code phase shift, and existence of a satellite is determined; then, one-dimensional carrier frequency searching is carried out, the correlation value is compared with the carrier shift threshold to acquire a carrier shift, and fast signal capturing is finished. The fast capturing method for the GNSS long code overcomes frequency shift accumulation brought by local crystal oscillators in the long code capturing process, and both sensitivity and speed are given consideration to finish fast long-code signal capturing without needing a large number of hardware resources.
Owner:JIAXING MICROELECTRONICS & SYST ENG CENT CHINESE ACADEMY OF SCI
Method and detecting carrier shift amount in digital transmission signal, method of correcting carrier shift amount, and receiver employing these methods
InactiveUS20050094739A1Improve immunityTime-division multiplexSecret communicationCarrier signalCarrier shift
A TMCC carrier is demodulated from a received OFDM signal having a TMCC carrier. A relative carrier position of the demodulated TMCC carrier is detected. A carrier shift amount is detected from the detected relative carrier position of the TMCC carrier and a normal TMCC carrier position. The received OFDM signal is corrected for the carrier frequency shift based on the detected carrier shift amount.
Owner:KOKUSA ELECTRIC CO LTD
Method and system for a polarization mode dispersion tolerant optical homodyne detection system with optimized transmission modulation
InactiveUS7599627B2Eliminate the effects ofFrequency/rate-modulated pulse demodulationAngle modulationCommunications systemData signal
An optical homodyne communication system and method in which a side carrier is transmitted along with data bands in an optical data signal, and upon reception, the side carrier is boosted, shifted to the center of the data bands, and its polarization state is matched to the polarization state of the respective data bands to compensate for polarization mode dispersion during transmission. By shifting a boosted side carrier to the center of the data bands, and by simultaneously compensating for the effects of polarization mode dispersion, the provided system and method simulate the advantages of homodyne reception using a local oscillator. The deleterious effects of chromatic dispersion on the data signals within the data bands are also compensated for by applying a corrective function to the data signals which precisely counteracts the effects of chromatic dispersion.
Owner:TERADVANCE COMM
Digital broadcast receiver, mobile terminal and channel search method
InactiveUS7835475B2Quick and highly accurate channel searchReduce search timeTelevision system detailsPicture reproducers using cathode ray tubesCarrier signalCarrier shift
A tuner selects a channel in a designated frequency band. An FFT circuit converts a received signal in the selected channel into a plurality of carrier signals. A carrier shift detection circuit calculates the correlation between the phase information of each carrier signal and reference phase information prepared in advance. If the correlation is larger than a given threshold, it is determined that an OFDM signal is present in the search target channel. A TMCC extraction circuit analyzes the TMCC of the received signal and determines whether or not digital broadcasts of the search target channel can be received.
Owner:SOCIONEXT INC
Method and system for a polarization mode dispersion tolerant optical homodyne detection system with optimized transmission modulation
InactiveUS8103173B2Eliminate the effects ofWavelength-division multiplex systemsFrequency/rate-modulated pulse demodulationCommunications systemData signal
An optical homodyne communication system and method in which a side carrier is transmitted along with data bands in an optical data signal, and upon reception, the side carrier is boosted, shifted to the center of the data bands, and its polarization state is matched to the polarization state of the respective data bands to compensate for polarization mode dispersion during transmission. By shifting a boosted side carrier to the center of the data bands, and by simultaneously compensating for the effects of polarization mode dispersion, the provided system and method simulate the advantages of homodyne reception using a local oscillator. The deleterious effects of chromatic dispersion on the data signals within the data bands are also compensated for by applying a corrective function to the data signals which precisely counteracts the effects of chromatic dispersion.
Owner:TERADVANCE COMM
Doppler carrier shift emulator for high-dynamic mobile telecommunication channel
The invention is concerned with the achieving project of the high dynamic mobile communication channel Doppler frequency-shift simulator, the project solves the Doppler frequency-shift simulating problem of the signal transmission at the high dynamic environment by the signal processing technology such as the time frequency domain transform, the interpolation fitting, the sampling.
Owner:中国人民解放军总参谋部第五十四研究所
Synchronous method of large search range OFDM system carrier based on statistical uniform
Because data symbol is independent identically distributed random data symbol, if the sub-carrier is big enough, the phase difference to the number K sub-carrier caused by carrier shift and differential modulation is a random phase evenly distributed on (-pi,pi). If the value choice interval of carrier sequence number is supposed to be (-W,-W+1,...,-1,0,1,...,W-1,W), the carrier shift can be estimated by making a statistical average for all carriers. In order to improve estimation accuracy of theta z, a process for averaging multi continuing OFDM data symbols can be adopted.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Actual data packet restoration method based on 802.11ac
InactiveCN106452674ACorrect estimation errorImprove throughputError prevention/detection by using return channelSignalling characterisationRestoration methodCarrier shift
The invention discloses an actual data packet restoration method based on 802.11ac. The aims of the invention are that incorrect signal state information feedback and identification of a low signal to noise ratio can be realized, CSI estimation errors are corrected, the signal to noise ratio is improved, an AP and all parallel transmission users of the AP are allowed to select a higher transmission rate at last, and the throughput of the network can also be improved. The adopted technical scheme is as follows: 1) the AP monitors CSI estimation containing errors after receiving a wrong data packet, and divides carriers into ''good'' carriers and ''bad'' carriers with an error rate as the standard, and the AP sends a training sequence to a plurality of users by using downlink beam forming to pass through the ''bad'' carriers; 2) based on the received training sequence, the users estimate the CSI again and report information to the AP to pass through the ''good'' carriers; 3) the AP judges factors causing the CSI errors, and then use different restoration mechanisms; and 4) CSI restoration includes CSI restoration of three factors of carrier shift, undersampled estimation and the low signal to noise ratio, and a composite factor of the three factors.
Owner:XI AN JIAOTONG UNIV
Carrier
InactiveUS20140361501A1Shorten speedCarrier of the disclosure can remain stableSafety devices for lifting equipmentsSteering linkagesCarrier shiftEngineering
A carrier including a body and a gravity modulating module disposed at the body is provided. The gravity modulating module includes a weight block, a tilting sensing assembly and a driver. The tilting sensing assembly is adapted for sensing the tilting condition of the body and sending a left turning signal or a right turning signal. The driver is adapted to move the weight block according to the left turning signal or the right turning signal, so that the center of gravity of the carrier shifts to keep balance.
Owner:CAL COMP ELECTRONICS
Refill module for an injection device
ActiveUS20140180218A1Simple and convenient fashionLimiting inadvertent needle stick riskAmpoule syringesAutomatic syringesCarrier shiftAbutment
A refill module for use with a plunger assembly and having a housing (30), a syringe subassembly (70), a carrier (120) and at least one latching element (170). The syringe subassembly is shiftable within the housing from a retracted position to an injecting position at which its injection tip projects beyond the housing end. The carrier has a passageway in which a plunger of a plunger assembly is insertable for advancement of a piston (80) of the syringe subassembly. The syringe subassembly is engagable by the carrier to be moved from its injecting position to a point at which the injection tip is retracted within the housing when the carrier shifts from a first axial position to a second axial position. The at least one latching element is shiftable relative to the carrier from a retracted arrangement to a latching arrangement such that a latch surface of the latching element restricts a size of the passageway to prevent plunger withdrawal. The carrier is liftable within the housing to retract the injection tip into the housing when the at least one plunger is retracted and a latch abutment surface of that plunger engages the latch surface. When the carrier reaches the second axial position, the at least one latching element is shiftable to move the latch surface clear of the latch abutment surface to allow withdrawal of the at least one plunger from the passageway without further lifting of the carrier.
Owner:ELI LILLY & CO
Refill module for an injection device
ActiveUS9192724B2Easy to optimizeLimiting inadvertent needle stickAmpoule syringesAutomatic syringesCarrier shiftEngineering
A refill module for use with a plunger assembly and having a housing (30), a syringe subassembly (70), a carrier (120) and at least one latching element (170). The syringe subassembly is shiftable within the housing from a retracted position to an injecting position at which its injection tip projects beyond the housing end. The carrier has a passageway in which a plunger of a plunger assembly is insertable for advancement of a piston (80) of the syringe subassembly. The syringe subassembly is engagable by the carrier to be moved from its injecting position to a point at which the injection tip is retracted within the housing when the carrier shifts from a first axial position to a second axial position. The at least one latching element is shiftable relative to the carrier from a retracted arrangement to a latching arrangement such that a latch surface of the latching element restricts a size of the passageway to prevent plunger withdrawal. The carrier is liftable within the housing to retract the injection tip into the housing when the at least one plunger is retracted and a latch abutment surface of that plunger engages the latch surface. When the carrier reaches the second axial position, the at least one latching element is shiftable to move the latch surface clear of the latch abutment surface to allow withdrawal of the at least one plunger from the passageway without further lifting of the carrier.
Owner:ELI LILLY & CO
A Step Wave Modulation Method for Sub-module Grouping of Modular Multilevel Converter
The invention provides a step wave modulation method for grouping sub-modules of a modular multi-level converter, which includes the following steps: dividing the sub-modules in the commutation chain into N sub-module groups; rounding the reference voltages of the sub-module groups to obtain The rounded reference staircase wave voltage Vstair_wave; distribute the trigger pulse to the sub-modules inside the sub-module group; perform voltage equalization between the sub-module groups. In the present invention, the sub-modules are divided into N sub-module groups, and each sub-module group is regarded as a controllable voltage source. Step wave modulation is used in the sub-module groups, and the N sub-module groups use rounding corrections, which can achieve similar wave shift For the purpose of the phase, the appropriate voltage equalization control method is used for voltage stabilization control between the sub-module groups, which simplifies the complexity of the ladder wave modulation, and greatly reduces the requirements for the software and hardware of the modulation algorithm and the voltage equalization control algorithm.
Owner:STATE GRID CORP OF CHINA +1
A random access preamble signal construction
ActiveCN107615868AIncrease the number ofRandom access success rate improvementMulti-frequency code systemsWireless communicationCarrier shiftComputer science
A node and an access node and methods therein for handling random access are disclosed. A method in a node for random access in a wireless network comprises, determining a set of sub-carrier shifts, wherein each sub-carrier shift indicates a shift with respect to a starting position in frequency domain for transmitting a random access preamble. The method further comprises selecting a sub-carriershift from the set of sub-carrier shifts. The method further comprises transmitting a random access preamble to an access node, wherein the random access preamble is transmitted according to the selected sub-carrier shift.
Owner:TELEFON AB LM ERICSSON (PUBL)
Method and system for a polarization mode dispersion tolerant optical homodyne detection system with optimized transmission modulation
InactiveUS20100046957A1Eliminate the effects ofWavelength-division multiplex systemsFrequency/rate-modulated pulse demodulationCommunications systemData signal
An optical homodyne communication system and method in which a side carrier is transmitted along with data bands in an optical data signal, and upon reception, the side carrier is boosted, shifted to the center of the data bands, and its polarization state is matched to the polarization state of the respective data bands to compensate for polarization mode dispersion during transmission. By shifting a boosted side carrier to the center of the data bands, and by simultaneously compensating for the effects of polarization mode dispersion, the provided system and method simulate the advantages of homodyne reception using a local oscillator. The deleterious effects of chromatic dispersion on the data signals within the data bands are also compensated for by applying a corrective function to the data signals which precisely counteracts the effects of chromatic dispersion.
Owner:TERADVANCE COMM
A double-deck lifting transfer machine
The invention relates to a double-layer jacking and transferring machine, comprising a jacking and transferring bracket used in conjunction with a double-layer chain machine; an upper jacking and transferring machine and a lower jacking and transferring machine are arranged on the jacking and transferring bracket; The upper lifting transfer machine includes an upper transfer assembly and two upper cylinders for providing jacking power, and the two upper cylinders are arranged above the two sides of the upper transfer assembly through two upper cylinder connection blocks; the upper transfer assembly There are also at least four upper linear guide shafts and upper linear bearings for guiding; the upper linear guide shaft is connected to the upper transfer assembly through the upper guide shaft fixing seat; the upper jack transfer machine also includes an upper block and an upper block plate; the structure of the lower jacking transfer machine is the same as that of the upper jacking transfer machine, and the bore diameter of the upper cylinder is larger than that of the lower cylinder. The double-layer jacking and transfer machine of the present invention can not only reliably transport jacked workpieces, but also meet the requirements of height and load at the same time, and has a more compact overall structure.
Owner:HUZHOU JIUTONG AUTOMATION TECH CO LTD
Neutral point voltage control method for neutral point clamped (NPC) type three-level inverter based on carrier amplitude shift
The invention discloses a method for controlling the midpoint voltage of an NPC three-level inverter based on carrier amplitude shift. K×m and 1-K×m, K is the carrier amplitude adjustment coefficient, m is the modulation ratio, the carrier amplitude is adjusted by adjusting the carrier amplitude adjustment coefficient in real time, and the carrier obtained after the amplitude adjustment is compared with the modulated wave Output PWM signal. The adjustment method of K is: when Unp is greater than Udc / 2, then -1≤K<0; if Unp is equal to Udc / 2, then K=0; if Unp is less than Udc / 2, then 0<K≤1; If Unp is greater than Udc / 2, then 0<K≤1, if Unp is equal to Udc / 2, then K=0, if Unp is less than Udc / 2, then -1≤K<0; where, is the power factor angle , Unp is the inverter midpoint voltage, Udc is the DC bus voltage. The present invention achieves the balance of the midpoint potential by keeping the frequency of the modulating wave and the upper and lower carrier waves unchanged, and changing the amplitudes of the upper and lower carrier waves. The method has the advantages of simple calculation and easy implementation.
Owner:HUAZHONG UNIV OF SCI & TECH
A Practical Packet Recovery Method Based on 802.11ac Network
InactiveCN106452674BCorrect estimation errorImprove throughputError prevention/detection by using return channelSignalling characterisationRecovery methodRestoration method
Owner:XI AN JIAOTONG UNIV
Modular multilevel converter adaptive sliding mode control system and method based on two-phase stationary coordinate system
The application provides an MMC adaptive sliding mode control system and method based on a two-phase stationary coordinate system, and relates to the field of power transmission. The method comprises the following steps: obtaining the alpha-beta axis components of the grid voltage and current, and constructing a mathematical model of the modular multilevel converter in the two-phase stationary coordinate system; calculating the current error value on the alpha-beta axis of the two-phase stationary coordinate system model; and presetting a composite sliding surface comprising a linear term and an integral term, which is used for dynamic convergence control target; constructing an adaptive sliding mode approach rate function with the error value as the independent variable, which is used for dynamically adjusting the approach speed according to the error size; and generating the control voltage signal on the alpha-beta axis based on the sliding surface and the adaptive approach rate, and outputting the control voltage signal to the power devices of the MMC through carrier shift modulation. The method solves the problem of high overall processing calculation complexity and control delay caused by the need to use a large number of calculations in the PI control technology of the traditional dq coordinate system.
Owner:STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER CO
Installation frame for bearing air conditioner outdoor unit
InactiveCN107664322AReduce labor consumptionReduce frictionLighting and heating apparatusAir conditioning systemsCarrier shiftEngineering
Owner:成都毅诚机电工程有限公司
Carrier synchronization realizing method under physical layer simulation mode of DMR (Digital Mobile Radio) communication system
ActiveCN101860515BSolve the problem of carrier synchronization tracking frequency offsetCarrier Synchronization FastMulti-frequency code systemsSynchronising arrangementData synchronizationIntermediate frequency
The invention discloses a carrier synchronization realizing method under a physical layer simulation mode of a DMR (Digital Mobile Radio) communication system. In the method, a DSP (Digital Signal Processor) reads an I value and a Q value from an intermediate-frequency digitalization processing chip; the DSP calculates carrier shift according to the I value and the Q value; the DSP adjusts a phaselocked loop parameter according to the carrier shift; and a phaselocked loop locks phases to achieve carrier synchronization. The invention can be applied to the carrier synchronization under the physical layer simulation mode of the DMR communication system, and can be further expanded to the field of communication products under all CPFSK (Continuous Phase Frequency Shift Keying) modulation modes. By adopting the invention, the problem of carrier synchronization tracking frequency offset can be solved, fast and accurate synchronization is realized on a DSP platform, and carrier synchronization can be fast and precisely realized within 6ms (which is relative to the locking time of a used phaselocked loop chip), wherein the synchronization precision is 16.02Hz.
Owner:FUJIAN KIRISUN ELECTRONICS
Synchronous method of large search range OFDM system carrier based on statistical uniform
Because data symbol is independent identically distributed random data symbol, if the sub-carrier is big enough, the phase difference to the number K sub-carrier caused by carrier shift and differential modulation is a random phase evenly distributed on (-pi,pi). If the value choice interval of carrier sequence number is supposed to be (-W,-W+1,...,-1,0,1,...,W-1,W), the carrier shift can be estimated by making a statistical average for all carriers. In order to improve estimation accuracy of theta z, a process for averaging multi continuing OFDM data symbols can be adopted.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Demodulating method of binary carrier shift key-controlling system based on Hibert transform
InactiveCN100496033CTake advantage ofImprove noise immunityModulated-carrier systemsBandpass filteringComputation complexity
The method includes: 1) the necessary band-pass filtering is made for received signal waveform in the binary frequency shift keying modulation; 2) a HHT processing is made for the processed signal waveform to get the instantaneous frequency distribution of the received signal waveform; 3) in time-frequency distribution domain, in term of given discrimination criterion, determining the polarity of received signal and completing demodulation.
Owner:SHANGHAI JIAO TONG UNIV
Method and detecting carrier shift amount in digital transmission signal, method of correcting carrier shift amount, and receiver employing these methods
InactiveUS7483368B2Improve immunityTime-division multiplexSecret communicationLocation detectionCarrier signal
A TMCC carrier is demodulated from a received OFDM signal having a TMCC carrier. A relative carrier position of the demodulated TMCC carrier is detected. A carrier shift amount is detected from the detected relative carrier position of the TMCC carrier and a normal TMCC carrier position. The received OFDM signal is corrected for the carrier frequency shift based on the detected carrier shift amount.
Owner:KOKUSA ELECTRIC CO LTD
Harmonic generator and method for detecting grid components through it
InactiveCN105071667BEfficiently simulate harmonic conditionsSimulate harmonic conditionsResistance/reactance/impedenceAc-ac conversionPhase currentsTransformer
Owner:HARBIN UNIV OF SCI & TECH
One-sided laneway layered transportation rolling way parallel parking type mechanical parking system
A mechanical parking system for side-by-side storage of single-sided roadway layered handling and raceways in the field of transportation parking equipment, comprising: storage-type warehouse racks, roadways, car storage areas, wheel holding raceways, external wells, and lift carriers , Longitudinal moving carrier, vehicle separation positioning and lateral moving and conveying device; the roadway is located on the lateral side of the storage-type storage rack, and each floor of the storage-type storage rack is provided with a storage area along the longitudinal direction of the roadway, on which the wheels are placed horizontally. The road can hold multiple vehicles side by side. Each layer in the roadway is equipped with longitudinal transporters to work in layers. A number of external wells are set along the lateral outer side of the roadway. There are lift transporters, lift transporters and longitudinal transporters. The same wheel holding raceway is also installed on the carrier, and between the storage area and the front and rear wheel holding raceways on the lift carrier, there is a vehicle separation, positioning, and transverse transfer device that can move laterally and extend into the longitudinal transfer carrier. Access operations traverse the vehicle. The invention has the advantages of large storage capacity and small footprint, simple structure, low cost and high operation efficiency.
Owner:SHANGHAI JIAO TONG UNIV
Power Conversion Device
The communication abnormality determination unit (45) classifies the N submodules (SM) into a plurality of healthy submodules capable of communication and zero or more abnormal submodules unable to communicate, based on the state of data communication via a communication path (170) multiplexed for each of the N submodules (SM) constituting an arm. The SM control unit (50) generates an output voltage command value (Vsmref) and carrier shift parameters (Nsf,Ni) for each submodule (SM) and transmits them to the submodules (SM). The PWM control unit (30) controls the on / off of a plurality of switching elements in each submodule (SM) based on a comparison between the carrier wave (CW) and the output voltage command value (Vsmref). The carrier generation unit (31) generates a carrier wave (CW) using the carrier shift parameters (Nsf,Ni) so that the phases of the carriers (CW) of the plurality of healthy submodules are shifted at equal intervals.
Owner:MITSUBISHI ELECTRIC CORP