Product
Patsnap Eureka
For R&D, Patsnap Eureka makes reading and utilizing patents & technical documents easy.
Patsnap Eureka AIR
Designed for self-driven R&D workflows. Generate viable solutions, solve complex R&D challenges, empower your innovation with AI.
Patsnap Eureka Materials
Designed for material experts only. Revolutionize your material R&D, from search, analyze, to developing new materials.
Feature
TechResearch
Generate reliable direction feasibility study reports for your R&D in just a few steps.
TechSeek
Discover and master advanced knowledge NOW. Basics, ideas, possibilities, all at once.
TechMind
As an expert in R&D Theories, TechMind can generates customized viable solutions instantly.
TechRisk
Analyze your overall solution with one click, know your potential R&D risks in advance.
TechMonitor
Get weekly tech updates, stay abreast of the latest tech innovations and key insights.
Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
933 results about "Phase-shift keying" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Phase-shift keying (PSK) is a digital modulation process which conveys data by changing (modulating) the phase of a constant frequency reference signal (the carrier wave). The modulation is accomplished by varying the sine and cosine inputs at a precise time. It is widely used for wireless LANs, RFID and Bluetooth communication.
Adaptive power control based on a rake receiver configuration in wideband CDMA cellular systems (WCDMA) and methods of operation
InactiveUS6621808B1Maximizes controlMaximize throughputPower managementTransmission control/equalisingChannel powerOperational system
A WCDMA system includes a Base Station (BS) or forward transmitter and a pilot channel that transmits control signals between a Mobile Station (MS) and BS to reconfigure their transmitter / receiver according to the prediction of the channel power and channel power probability density function separated into three distinct equal probable regions. Data signals are encoded using a one-half Viterbi encoder and interleaved. The interleaved data bits are modulated using Quadrature Phase Shift Keying (QPSK) modulation. The QPSK data is multiplexed with the pilot channel and spread by an appropriate code in an OFDM transmitter modified by a long code. Output of the transmitter may be provided to two diverse antennas for reliable communications to the receiver. Data may be received at two diverse antennas. The outputs are provided to match filters coupled to a coherent rake receiver and a channel prediction system. The future attenuation of the channel coefficients and power are determined by the prediction system for several milliseconds. The power levels of each finger in the Rake receiver can be predicted and the strongest ones used in determining the optimum transmitter power or rate control for operating the system transmitters and receivers based on computing a long range power prediction of each finger of a rake receiver.
Owner:WISTRON CORP
Equalization strategy for dual-polarization optical transport system
ActiveUS20050196176A1Avoid convergencePrevent degradationMultiple-port networksError preventionDigital signal processingSelf recovery
A method is provided for an equalization strategy for compensating channel distortions in a dual-polarization optical transport system wherein the received signal includes a complex signal of a first transmitted polarization component and a complex signal of a second transmitted polarization component. In a first step, a blind self-recovery mode used a blind adaptation algorithm in calculating and modifying multiple complex equalizer transfer function coefficients to enable recovery of only the complex signal of the first transmitted polarization component. By recovering only a single polarization component in the first step the degenerate case of recovering only a single transmitted signal at both polarization component outputs of an equalizer is prevented. In a second step, equalization is performed in a training mode for calculating and modifying the multiple complex equalizer transfer function coefficients to enable recovery of the complex signals of the first and second transmitted polarization components. In a third step, equalization is performed in a data directed mode for continuing to calculate and modify the multiple complex equalizer transfer function coefficients to ensure continued recovery of the complex signals of the first and second transmitted polarization components. The method is suited for a digital signal processing implementation in a coherent receiver when a modulation scheme used on a transmitted signal is quadriphase-shift keying (QPSK). In other embodiments, the method can be used with modulation schemes such as binary PSK, M-ary PSK where M>4, or Quadrature Amplitude Modulation (QAM).
Owner:CIENA
Bit labeling for amplitude phase shift constellation used with low density parity check (LDPC) codes
InactiveUS6963622B2Improve performanceError correction/detection using LDPC codesCode conversionParity-check matrixEngineering
An approach is provided for bit labeling of a signal constellation. A transmitter generates encoded signals using, according to one embodiment, a structured parity check matrix of a Low Density Parity Check (LDPC) code. The transmitter includes an encoder for transforming an input message into a codeword represented by a plurality of set of bits. The transmitter includes logic for mapping non-sequentially (e.g., interleaving) one set of bits into a higher order constellation (Quadrature Phase Shift Keying (QPSK), 8-PSK, 16-APSK (Amplitude Phase Shift Keying), 32-APSK, etc.), wherein a symbol of the higher order constellation corresponding to the one set of bits is output based on the mapping.
Owner:DTVG LICENSING INC
Method and apparatus for transmitting uplink acknowledgement information in an OFDMA communication system
ActiveUS20050286402A1Guaranteed normal transmissionImprove reliabilityError prevention/detection by using return channelTransmission path divisionFast Fourier transformCommunications system
A method and apparatus for transmitting uplink acknowledge information (ACK) in a communication system using an orthogonal frequency division multiple access (OFDMA) scheme. The method includes receiving a data bit for the uplink ACK; outputting codewords corresponding to the data bit; performing quadrature phase shift keying (QPSK) modulation on symbols for ACK vector indexes corresponding to the codewords for the received data bit; performing inverse fast Fourier transform (IFFT) on a transmission signal having subcarrier clusters to which the modulated transmission symbols are allocated; and transmitting the IFFT-processed transmission signal.
Owner:SAMSUNG ELECTRONICS CO LTD
Encryption counterfeit printing technology of frequency modulated halftone dot space position for pseudo random signal modulation printed matter
InactiveCN101699845ACombating Illegal CopyingStrong anti-counterfeiting abilityPictoral communicationElectronic documentDocumentation
The invention discloses an encryption counterfeit printing technology based on the frequency modulated halftone dot space position in a pseudo random signal modulation hybrid screening. The counterfeit printing technology can change the counterfeit information into the pseudo random modulation signal through spread spectrum, encryption and channel coding to generate, embed the counterfeit information in the entire page though the quadrature phase shift keying (QPSK), and identify the counterfeit information in any fragment when identifying the printing matter so that the technology of the invention has strong shatter resistant, can more effectively counter the illegal copying behavior based on cameras, scanners, electronic documents and the like, and can be widely applied in the counterfeit field of the printing matter.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Method and system for increasing data rate in a mobile terminal using spatial multiplexing for DVB-H communication
A method and system for increasing data rate in a mobile terminal using spatial multiplexing for digital video broadcasting for handhelds (DVB-H) communication are provided. A reconfigurable orthogonal frequency division multiplexing (OFDM) chip may be utilized in a mobile terminal to process received spatially multiplexed signals. The mobile terminal may be utilized in a spatially multiplexed multiple-input-multiple-output (SM-MIMO) wireless system. The spatially multiplexed signals may be quadrature phase shift keying (QPSK) modulated and may utilize OFDM subcarries. A processor may be utilized to configure the OFDM chip to process signals such as IEEE 802.11 and 802.16, and DVB. The OFDM chip may generate channel weights to be applied to the spatially multiplexed signals received in multiple receive antennas. The weighted signals may be combined to generate multiple RF received signals from which channel estimates may be generated. Subsequent channel weights may be dynamically generated from generated channel estimates.
Owner:AVAGO TECH INT SALES PTE LTD
Remote wire feeder using binary phase shift keying to modulate communications of command/control signals to be transmitted over a weld cable
ActiveUS9012807B2Improve signal qualityImproving impedanceSimultaneous amplitude and angle modulationError prevention/detection by using return channelControl signalWelding power supply
Owner:ILLINOIS TOOL WORKS INC
Time-frequency interleaved orthogonal frequency division multiplexing ultra wide band physical layer
ActiveUS7756002B2Enough timeFrequency-division multiplexMulti-frequency code systemsArea networkCarrier signal
A PHY entity for a UWB system utilizes the unlicensed 3.1-10.6 GHZ UWB band, as regulated in the United States by the Code of Federal Regulation, Title 47, Section 15. The UWB system provides a wireless pico area network (PAN) with data payload communication capabilities of 55, 80, 110, 160, 200, 320 and 480 Mb / s. The UWB system employs orthogonal frequency division multiplexing (OFDM) and uses a total of 122 sub-carriers that are modulated using quadrature phase shift keying (QPSK). Forward error correction coding (convolutional coding) is used with a coding rate of 11 / 32, 1 / 2, 5 / 8 and 3 / 4.
Owner:APPLE INC
Method for amplitude insensitive packet detection
ActiveUS20050058227A1High outputEasy to detectAmplitude-modulated carrier systemsSynchronisation signal speed/phase controlPhase correlationComputer science
The invention relates generally to the field of wireless communications and more particularly to a method of and device for detecting the presence of a received data packet in a digital receiver. The present invention proposes a simplified method of correlation by removing dependency on the amplitude fluctuations while at the same time maintaining phase relevancy. The key advancement involves mapping the complex quadrature amplitude modulation (QAM) preamble to a quantized phase shift keying (PSK) constellation before application to a matched complex correlator. The proposed process essentially “amplitude normalizes” the input signal without the use or complexity associated with a divider. This simplified normalization scheme makes the packet detection algorithm robust against amplitude variations in the input signal, while still allowing for good correlation output. In applications where interference is superimposed on the I / Q input signals, the invention improves the detection capability over automatic gain control (AGC) normalization methods.
Owner:ZARBANA DIGITAL FUND
Universal acquisition and tracking apparatus for global navigation satellite system (GNSS)
ActiveUS20110261805A1Instruments for road network navigationRoad vehicles traffic controlEngineeringFrequency domain multiplexing
An acquisition and tracking apparatus is provided for tracking digitized spread spectrum navigation signals modulated with a spreading code according to any of a set of modulation types including Binary Phase Shift Keying (BPSK) with and without Frequency Domain Multiplexing Access (FDMA), time multiplexed BPSK, Quadrature Phase Shift Keying (QPSK), sine and cosine Binary Offset Carrier (BOC), modified, complex, and time multiplexed BOC (TMBOC), the apparatus comprising a plurality of universal tracking channels, each coupled to an interrupt module. The universal tracking channel includes a carrier demodulation module, a code generation module, a correlator module, a code frequencies generation module, and a subcarrier combining module for efficiently using the correlator resources in the correlation of the data and the pilot components of the signal within a single universal tracking channel. A corresponding method of operation is also provided.
Owner:ECOLE DE TECH SUPERIEURE
Wireless local area network spread spectrum transceiver with multipath mitigation
InactiveUS6678310B1Spatial transmit diversityNetwork traffic/resource managementFinite impulse responseHigh rate
Owner:HANGER SOLUTIONS LLC +1
Reference signal design and association for physical downlink control channels
A method and apparatus for designing a Reference Signal (RS) used by a User Equipment (UE) to obtain respective channel estimates for demodulating respective Physical Downlink Control CHannels (PDCCHs), for determining at a UE a number of resource blocks to include for a reception of a Physical Downlink Shared CHannel (PDSCH), for determining at a UE a RS antenna port in order to enable spatial multiplexing of Enhanced PDCCH (EPDCCH) transmissions to different UEs, and for supporting Quadrature Amplitude Modulation 16 (QAM16) modulation, in addition to Quadrature Phase Shift Keying (QPSK) modulation, for EPDCCH transmissions without increasing a number of decoding operations at a UE are provided.
Owner:SAMSUNG ELECTRONICS CO LTD
Method and Apparatus for Configuring a Transport Block Size in a Wireless Communications System
ActiveUS20080225784A1Multiplex communicationRadio/inductive link selection arrangementsCommunications systemUser equipment
A method of setting a transport block size for a user equipment in a wireless communications system includes providing a combination table for being looked up to generate a parameter value according to a combination of a modulation scheme and a number of channelization codes indicated by a base station, so as to decide a transport block size index, and configuring a first parameter value corresponding to a least resource usage in the combination table as a first transport block size index before deciding the transport block size index. The first transport block size index is a transport block size index corresponding to a smallest transport block size in a transport block size table, and the combination table and the transport block size table are used when quadrature phase shift keying (QPSK) modulation, 16 quadrature amplitude modulation (16 QAM) or 64 quadrature amplitude modulation (64 QAM) is activated.
Owner:INNOVATIVE SONIC
Wireless internet access system and method
InactiveUS20050100120A1Avoid Intersymbol InterferenceAdaptable to changeSpatial transmit diversityNetwork traffic/resource managementDifferential phaseWireless internet access
A wireless Internet access system and method supports the transmission and reception of multiple types of traffic between mobile subscriber units and existing networks. A frame structure is used that can support the transmission of multiple types of traffic and adapt to changes in the traffic types needed and the amount of data for a particular traffic type. In addition, data transmission is performed using orthogonal frequency division multiplexing and differential phase shift keying to avoid intersymbol interference. Receiving units in the mobile subscriber units and existing networks include antenna arrays to provide a multipath transmission.
Owner:TELCORDIA TECHNOLOGIES INC
Method and system for providing short block length low density parity check (LDPC) codes
InactiveUS7334181B2Low ParityMinimize resourceTransmission systemsError correction/detection using LDPC codesDigital videoTheoretical computer science
An approach is provided for generating Low Density Parity Check (LDPC) codes. An LDPC encoder generates a short LDPC code by shortening longer mother codes. The short LDPC code has an outer Bose Chaudhuri Hocquenghem (BCH) code. According to another aspect, for an LDPC code with code rate of 3 / 5 utilizing 8-PSK (Phase Shift Keying) modulation, an interleaver provides for interleaving bits of the output LDPC code by serially writing data associated with the LDPC code column-wise into a table and reading the data row-wise from right to left. The above approach has particular application in digital video broadcast services over satellite.
Owner:DTVG LICENSING INC
Bit interleaver for low-density parity check codeword having length of 64800 and code rate of 7/15 and quadrature phase shift keying, and bit interleaving method using same
ActiveUS20150214982A1Effective distributionEfficiently distributedError correction/detection using LDPC codesError correction/detection using multiple parity bitsLow-density parity-check codeLow density
A bit interleaver, a bit-interleaved coded modulation (BICM) device and a bit interleaving method are disclosed herein. The bit interleaver includes a first memory, a processor, and a second memory. The first memory stores a low-density parity check (LDPC) codeword having a length of 64800 and a code rate of 7 / 15. The processor generates an interleaved codeword by interleaving the LDPC codeword on a bit group basis. The size of the bit group corresponds to a parallel factor of the LDPC codeword. The second memory provides the interleaved codeword to a modulator for quadrature phase shift keying (QPSK) modulation.
Owner:ELECTRONICS & TELECOMM RES INST
System and method of providing communications in a wireless power transfer system
ActiveUS20130039395A1Simple and effective systemSimple and effective and methodSimultaneous amplitude and angle modulationNear-field transmissionElectric power transmissionCommunications system
A communication system that uses keyed modulation to encode fixed frequency communications on a variable frequency power transmission signal in which a single communication bit is represented by a plurality of modulations. To provide a fixed communication rate, the number of modulations associated with each bit is dynamic varying as a function of the ratio of the communication frequency to the carrier signal frequency. In one embodiment, the present invention provides dynamic phase-shift-keyed modulation in which communications are generated by toggling a load at a rate that is a fraction of the power transfer frequency. In another embodiment, the present invention provides communication by toggling a load in the communication transmitter at a rate that is phase locked and at a harmonic of the power transfer frequency. In yet another embodiment, the present invention provides frequency-shift-keyed modulation, including, for example, modulation at one of two different frequencies.
Owner:PHILIPS IP VENTURES BV
An easy-to-realize method and device for full digital frequency conversion
InactiveCN101262240AImprove versatilityIncrease working frequencyModulation transferenceTransmissionControl signalIntermediate frequency
The invention discloses an all digital frequency converting method and a device thereof, being easily realized for hardware. The method and the device are essentially used for sample rate convertion of rational number-times of baseband signals and the convertion of the baseband signals and the intermediate frequency signals in digital communication. Under the coordination of control signals and enabling signals, the convertion of signal sample rate can be finished and the convertion of the baseband signals and the intermediate signals can be finished through the reasonable matching of variable integral number-times wave filtering and fraction-times interpolation. The system of the invention essentially comprises a frequency mixer, a cascade connection integral comb filter, a fraction-time interpolating device, a half-band filter, a signal shaping filter, a power detection module and a control interface. The configurable hardware implemented structure of the invention is applicable to a plurality of modulation methods, has the advantages of low resource consumption and good portability, and is used for various wireless communication systems such as multilevel phase shift keying (MPSK), orthogonal frequency division multiplex (OFDM), direct sequence spread spectrum (DSSS) and continuous phase modulation (CPM), etc.
Owner:ZHEJIANG UNIV
Method for data communication via a voice channel of a wireless communication network
ActiveUS20070258398A1Radio/inductive link selection arrangementsFrequency-modulated carrier systemsDigital dataCarrier signal
A system and method for data communication over a cellular communications network that allows the transmission of digital data over a voice channel using a vocoder that operates in different modes depending upon characteristics of the inputted signal it receives. To prepare the digital data for transmission, one or more carrier signals are encoded with the digital data using one of a number of modulation schemes that utilize differential phase shift keying to give the modulated carrier signal certain periodicity and energy characteristics that allow it to be transmitted by the vocoder at full rate. The modulation schemes include DPSK using either a single or multiple frequency carriers, combined FSK-DPSK modulation, combined ASK-DPSK, as well as PSK with a phase tracker in the demodulator. These modulation schemes permit data communication via a CDMA, GSM, or other type of voice traffic channel at a low bit error rate.
Owner:GENERA MOTORS LLC
Method and apparatus for transmitting and receiving convolutionally coded data for use with combined binary phase shift keying (BPSK) modulation and pulse position modulation (PPM)
ActiveUS7636397B2Improve performanceData representation error detection/correctionModulated-carrier systemsCommunications systemConvolutional code
Owner:DECAWAVE
Optical receiver and optical receiving method corresponding to differential M-phase shift keying system
InactiveUS20060280510A1Small sizeLow costModulated-carrier systemsElectromagnetic transmittersPath lengthSignal light
An optical receiver comprises branching units for branching and supplying the signal lights to be inputted to the first to fourth optical waveguides provided on a substrate, second to third optical waveguides for giving delay time differences corresponding to a symbol of the DMPSK modulated signal, a demodulating unit for demodulating two light signals through interference of signal lights between the first to second optical waveguides and between the third to fourth optical waveguides, two optical detectors for converting two light signals from the demodulating unit, and a light path length varying unit for identically varying each light path length of two optical waveguides being arranged through selection of combinations of the first and third optical waveguides, the first and fourth optical waveguides, and the second and third optical waveguides in one region when the wavelength of the signal light is varied.
Owner:FUJITSU LTD
Method and apparatus for transmitting uplink acknowledgement information in an OFDMA communication system
ActiveUS7586834B2Guaranteed normal transmissionImprove reliabilityError prevention/detection by using return channelTransmission path divisionFast Fourier transformCommunications system
Owner:SAMSUNG ELECTRONICS CO LTD
Method and system for providing short block length low density parity check (LDPC) codes
ActiveUS20050060635A1Minimizing storageMinimizing processing resourceTransmission systemsError correction/detection using LDPC codesDigital videoTheoretical computer science
An approach is provided for generating Low Density Parity Check (LDPC) codes. An LDPC encoder generates a short LDPC code by shortening longer mother codes. The short LDPC code has an outer Bose Chaudhuri Hocquenghem (BCH) code. According to another aspect, for an LDPC code with code rate of 3 / 5 utilizing 8-PSK (Phase Shift Keying) modulation, an interleaver provides for interleaving bits of the output LDPC code by serially writing data associated with the LDPC code column-wise into a table and reading the data row-wise from right to left. The above approach has particular application in digital video broadcast services over satellite.
Owner:DTVG LICENSING INC
Method to minimize compatibility error in hierarchical modulation
ActiveUS7215713B2Increase volumeIncrease the amount of dataLeaf springsMultiplex communicationData signalData rate
Owner:APTIV TECH LTD
Bit interleaver for low-density parity check codeword having length of 16200 and code rate of 3/15 and quadrature phase shift keying, and bit interleaving method using same
ActiveUS20150341048A1Efficiently distributedError correction/detection using LDPC codesError correction/detection using multiple parity bitsLow-density parity-check codeLow density
A bit interleaver, a bit-interleaved coded modulation (BICM) device and a bit interleaving method are disclosed herein. The bit interleaver includes a first memory, a processor, and a second memory. The first memory stores a low-density parity check (LDPC) codeword having a length of 16200 and a code rate of 3 / 15. The processor generates an interleaved codeword by interleaving the LDPC codeword on a bit group basis. The size of the bit group corresponds to a parallel factor of the LDPC codeword. The second memory provides the interleaved codeword to a modulator for quadrature phase shift keying (QPSK) modulation.
Owner:ELECTRONICS & TELECOMM RES INST
Constellation mapping method based on absolute phase shift keying (APSK) constellation map, coded modulation method and system
ActiveCN102752261AImprove performanceError preventionMultiple carrier systemsComputer scienceQam constellations
The invention discloses a constellation mapping method based on an absolute phase shift keying (APSK) constellation map. The constellation mapping method is characterized in that the order M of an APSK constellation is equal to 2<m>; the number n1 of points on each ring is equal to a value of powers to 2, namely n1=2<m1>, the number n1=2<m1>-PSK (phase shift keying), the number of rings R=2<m2>, and a set consisting of different ring radiuses is a special 2<m2>-PAM(pulse amplitude modulation ), wherein m1+m2=m; and the phase deflection theta1 of all the rings are the same. The method comprises the following steps of: B1, for a bit vector which is m in length, setting m1 bits to be only related to the phase, and adopting PSK Gray mapping between the m1 bits and the 2<m1>-PSK; and B2, setting the rest m2 bits to be only related to the amplitude, and adopting PAM Gray mapping between the m2 bits and the 2<m2>-PAM. The invention has the advantages that compared with the conventional coded modulation system adopting quadrature amplitude modulation (QAM) constellation map mapping, the coded modulation system adopting the APSM constellation map Gray mapping can acquire a considerable error control performance gain regardless of adopting independent demapping or iterative demapping by a receiving end.
Owner:TSINGHUA UNIV
Enhanced metric for bit detection on fading channels with unknown statistics
InactiveUS6952561B1Improve performanceRadio transmissionTransmission monitoringDemodulationPhase-shift keying
A universal mobile telecommunications system (UMTS) receiver uses Pilot Symbol Assisted Modulation (PSAM) in demodulating a received Binary Phase Shift Keying (BPSK) signal. The UMTS receiver uses a ratio of the transmitted energy per pilot symbol to the transmitted energy per data symbol as an index into a look-up table to return a value for a scale factor for use in demodulation of the received signal, which provides better performance during periods when the fading distribution is unknown.
Owner:LUCENT TECH INC
Methods and Apparatus For Hierarchical Modulation Using Radial Constellation
InactiveUS20080170640A1Reduce decreaseAngle modulationFrequency-modulated carrier systemsComputer scienceConstellation
There is provided a method for hierarchical modulation relating to a first signal, a second signal, and an original constellation having a plurality of symbols in a non-uniform 8 Phase-Shift-Keying (PSK) configuration. Quadrature-Phase-Shift-Keying (QPSK) modulation is used for the first signal and Binary-Phase-Shift-Keying (BPSK) modulation is used for the second signal. The method includes the step of replacing at least some of the plurality of symbols with at least one radial-type QPSK-BPSK constellation.
Owner:THOMSON LICENSING SA
Multi-layer differential phase shift keying with bit-interleaved coded modulation and OFDM
InactiveUS20050111590A1Increase data rateEfficient methodAngle modulationSecret communicationEngineeringDifferential modulation
An efficient system and method for modulation and demodulation to achieve a high data rate using Bit-Interleaved Coded Modulation and OFDM uses either a coherent or a non-coherent transmission scheme using differential modulation. In order to maintain a high data rate impervious to sudden phase changes, a communication system uses an efficient constellation having multiple rings with different sizes and modulation / demodulation schemes utilizing this constellation. In power line communications, the channel gain information is obtained easily at a receiver (100) while the phase information is not. Thus, the communication system uses an absolute magnitude and differential phase coding for modulation and demodulation of the signals.
Owner:UNIV OF FLORIDA RES FOUNDATION INC +1
Non-equal probability constellation labeling method based on absolute phase shift keying (APSK) constellation diagram
ActiveCN103036845AImprove performanceLower SNR ThresholdError preventionMultiple carrier systemsSignal-to-noise ratio (imaging)Equal probability
Disclosed is a non-equal probability constellation labeling method based on an absolute phase shift keying (APSK) constellation diagram. The non-equal probability constellation labeling method based on the APSK constellation diagram is characterized by comprising the steps that: the APSK constellation diagram is constructed, number of steps of the constellation labeling is M, M=2m, and m is a positive integer, numbers of constellation points on each ring is the same, phase deviations of each ring are also the same; a constellation labeling mode of the APSK constellation diagram is designed, and the constellation labeling mode is enabled to be a gray labeling; the constellation points are grouped, and constellation points on the same ring are combined to be a new constellation point; labeling bits of the prior constellation points on the same ring are distributed to the new constellation point in sequence. According to the non-equal probability constellation labeling method based on the APSK constellation diagram, the inhomogeneous constellation diagram and a non-equal probability labeling technology are adopted, distribution of output signals of the constellation labeling is enabled to be close to Gaussian distribution, shaping gain is achieved, performance of a coded modulation system is improved, and signal to noise ratio in a modulation process is reduced.
Owner:TSINGHUA UNIV +1
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Patsnap Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com