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109 results about "Minimum-shift keying" patented technology
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In digital modulation, minimum-shift keying (MSK) is a type of continuous-phase frequency-shift keying that was developed in the late 1950s and 1960s. Similar to OQPSK, MSK is encoded with bits alternating between quadrature components, with the Q component delayed by half the symbol period. However, instead of square pulses as OQPSK uses, MSK encodes each bit as a half sinusoid. This results in a constant-modulus signal (constant envelope signal), which reduces problems caused by non-linear distortion.
Blind interference mitigation in a digital receiver
InactiveUS20070127608A1Improve acceleration performanceReduce computational complexityError preventionLine-faulsts/interference reductionEngineeringCo-channel interference
A novel and useful apparatus for and method of Gaussian Minimum Shift Keying (GMSK) single antenna interference cancellation (SAIC) for use in a digital receiver. The invention comprises an interference mitigation module that treats the problem of GMSK SAIC in a blind manner. The interference mitigation mechanism is operative to compensate for the co-channel interference added in the communications channel which is subject to multipath propagation and fading, receiver filter and any pre-channel estimation filtering. The interference mitigation module takes advantage of the spatial diversity making up multiple branches of the received signal. The branches comprise the in-phase and quadrature elements of the received signal, the sampling phases if over sampling is applied (i.e. T / m sampling) and / or multiple antennas. The invention utilizes the spatial diversity of these multiple representations of the received signal and combines (i.e. collapses) the information in the plurality of branches into a single branch that is input to the equalizer.
Owner:COMSYS COMM & SIGNAL PROC
Adaptive receivers for bit rate agile (BRA) and modulation demodulation (modem) format selectable (MFS) signals
InactiveUS7376180B2Improve performanceSignificant spectral saving advantageMultiple-port networksSecret communicationModem deviceThird generation
Systems, apparatus, and methods for new generations of wireless systems, including multiple standard, interoperable Third-Generation (3G) and Second-Generation (2G), Spread Spectrum CDMA, WCDMA, GSM, Enhanced GSM systems and CSMA, TDMA and OFDM. Bit Rate Agile (BRA), Modulation and Code Selectable processing techniques of Gaussian Minimum Shift Keying (GMSK), Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (QAM), and of Mis-Matched demodulator filters in which the demodulator filter set is mismatched to the filter set of the signal modulator.
Owner:FEHER KAMILO
Demodulation of multiple signals
InactiveUS20060083320A1Improve efficiencyImprove performanceError preventionTransmission path divisionEngineeringRate modulation
A demodulation system for receiving and demodulating multiple modulated signals, including a first modulated signal having a first bit rate and / or a first modulation format and a second modulated signal having a second bit rate and / or a second modulation format. The demodulator demodulating the first modulation format modulated signal provides a cross-correlated demodulated in-phase and quadrature-phase baseband signal and the demodulator demodulating the second modulation format modulated signal provides a second demodulated baseband signal. A selector selects either the first or the second or both bit rate and / or modulation format demodulated baseband signals. In an alternative embodiment two demodulators are implemented for the demodulation of multiple signals. In certain embodiments the demodulator demodulating the first bit rate modulated signal or the second bit rate modulated signal is comprised of bit rate switchable filters and / or mis-matched filters which are mismatched to that of the filters of the modulator of the first or the second bit rate modulated signal. In some of the applications the first or the second modulated signal is an Orthogonal Frequency Division Multiplexed (OFDM) modulated signal and / or a spread spectrum modulated signal and / or Phase Shift Keying (PSK) modulation, or a Quadrature Modulation (QM), or a Frequency Modulation (FM) modulated signal. In certain implementations and applications the demodulator is used for demodulation of Gaussian Minimum Shift Keying (GMSK) modulated signals and spread spectrum modulated signals.
Owner:WI LAN INC
Linear interference cancellation receiver for edge systems
A method for providing interference suppression in a communication device includes receiving a signal, determining if the received signal comprises a Gaussian Minimum Shift Keying (GMSK) or an 8 phase shift keying (8PSK) signal. Over sampling and inphase and quadrature phase separation with real-valued signal processing on the received signal is performed whenever the received signal is determined to be a GMSK signal. Oversampling with complex-valued signal processing on the received signal is performed whenever the received signal is determined to be an 8PSK signal. A receiver is also disclosed that provides for interference suppression.
Owner:TEXAS INSTR INC
QAM and GMSK systems
InactiveUS8050345B1Improve efficiencyImprove performanceTransmission path divisionSecret communicationAudio power amplifierPhase filter
Transmit baseband filter and modulator for filtering and modulating a first bit rate signal into a Gaussian filtered modulated signal and a second transmit filter and modulator for filtering and modulating a second bit rate signal into a Quadrature Amplitude Modulated (QAM) signal. A first amplifier and first transmitter for nonlinearly amplifying and a second amplifier and second transmitter for linearly amplifying modulated signals. A diversity receiver and demodulator system for receiving and demodulating transmitted modulated signals. Processor, transmit baseband filter and modulator provides cross-correlated in-phase and quadrature-phase Gaussian filtered Gaussian Minimum Shift Keying (GMSK) modulated signal, spread spectrum Quadrature Phase Shift Keying (QPSK) modulated signal. Transmit processor and filter provides time division multiplexed (TDM) Gaussian filtered baseband signal and Orthogonal Frequency Division Multiplexed (OFDM) in-phase and quadrature-phase baseband modulated signal to a cellular network and to separate wireless network. Diversity receiver and demodulator provides demodulated cross-correlated in-phase and quadrature-phase filtered signal, with receive filter mis-matched to transmit filter.
Owner:FEHER KAMILO
Quaternary precoded continuous phase modulation soft bit metric demodulator
ActiveUS20060274862A1Data representation error detection/correctionError preventionLow complexityCorrection code
A receiver generates log-likelihood-ratio-based soft bit metrics of precoded quaternary continuous phase modulation signals using four state-constrained trellises and a streamlined maximum likelihood sequence estimation Viterbi algorithm requiring no survivor state storage elements for a preferred error correction-coded quaternary Gaussian minimum shift keying communication system employing reduced-complexity pulse-amplitude modulation matched-filtering and soft-decision decoding.
Owner:THE AEROSPACE CORPORATION
Gaussian minimum shift keying (GMSK) precoding communication method
InactiveUS7072414B1Increase ratingsLower BERError preventionAngle modulationPrecodingFrequency spectrum
A premodulation precoding method precodes a data sequence in a Gaussian minimum shift keying (GMSK) modulator to improve the bit error rate performance of a coherent Viterbi receivers generating estimates of the communicated data sequence without the use of differential decoding while preserving the spectrum of 2-ary and 4-ary GMSK signals over a wide range of bandwidth time products.
Owner:THE AEROSPACE CORPORATION
DNA and fingerprint authentication of mobile devices
ActiveUS9307407B1Expand coverageImprove performanceModulated-carrier systemsUnauthorised/fraudulent call preventionCode division multiple accessControl signal
Owner:FEHER KAMILO
Connection establishing method, terminal and access point
ActiveCN102883316AReduce battery consumptionReduce the number of interactionsEnergy efficient ICTUser identity/authority verificationComputer hardwareUser identifier
The invention discloses a connection establishing method, a terminal and an access point (AP). The method comprises the following steps of: sending a first authentication message comprising a user identifier to the AP; receiving a second authentication message which is sent by the AP according to the user identifier and comprises an extensible authentication protocol (EAP) method request message and a site value ANonce of the AP; generating a first pairwise transient key (PTK) according to the ANonce, an SNonce and acquired first minimum shift keying (MSK); sending a third authentication message to the AP, wherein the third authentication message comprises an EAP method response message, the SNonce and first minimal inhibitory concentration (MIC) generated according to the first PTK; receiving a fourth authentication message which is sent by the AP when the first MIC is checked to be correct according to a second PTK, wherein the fourth authentication message comprises an EAP success message, configuration information configured by the AP to the terminal, and second MIC; and checking the second MIC according to the first PTK. By the method, the terminal and the AP of the embodiment of the invention, the interaction number of empty messages can be reduced, and the connection establishment time is shortened, so that electric consumption of the terminal can be reduced, and the user experience is enhanced.
Owner:HUAWEI DEVICE CO LTD
Data aided symbol timing system for precoded continuous phase modulated signals
InactiveUS6862324B1Reduce Design ComplexityCorrection can not be performedCarrier regulationFrequency-modulated carrier systemsTime errorCarrier signal
Data aided carrier phase and symbol timing synchronizers are implemented at baseband as digital modulators isolating input signal inphase and quadrature component signals fed into inphase and quadrature Laurent transforms that function as data detector to provide odd and even data bit multiplexed output data signal while cross coupling the inphase and quadrature transformed outputs for removing data modulation in error signals to correct phase errors and timing errors in the received signal so as to provide reliable data demodulation of noisy received signals having dynamic carrier phase and symbol timing errors as found in continuous phase modulation communications systems such as Gaussian minimum shift keying communications systems.
Owner:THE AEROSPACE CORPORATION
Coherent pseudo code ranging method based on MSK (minimum shift keying) spread spectrum modulation mode
ActiveCN103533651AHigh bandwidthReduce the problem of excessive phase deviationFrequency-modulated carrier systemsWireless communicationInterference resistanceCoded element
The invention discloses a coherent pseudo code ranging method based on an MSK spread spectrum modulation mode, and relates to the technical field of communication. The method is based on MSK spread spectrum demodulation, a base band ranging pseudo code of a signal is embedded in a communication information code, the ranging is performed at a receiving terminal, two-time coarse ranging and one-time refined ranging are adopted for ranging during the whole process, and a novel filtering mode is adopted during code element synchronization process simultaneously. The method has the benefits as follows: ranging frames are embedded into information frames under the conditions that a communication channel bandwidth is not increased and an original information rate, a spreading code rate and the a MSK modulation mode are not changed, so that long-distance and high-accuracy ranging is realized simply, conveniently and rapidly; the system is operated under the MSK modulation mode and has stronger capacity of resistance to interference and capture; and besides, an improved filtering method is adopted in the code element synchronization method so as to solve the problem of overlarge phase deviation of a bit synchronization pulse, and phase adjustment time is shortened simultaneously.
Owner:CHENGDU AEROSPACE COMM EQUIP CO LTD
MSK/GMSK (Gaussian Filtered Minimum Shift Keying) coherent demodulation processing system
ActiveCN106856463AEasy to operateSimple operation logicModulated-carrier systemsInformation processingLow-pass filter
The invention discloses an MSK / GMSK (Gaussian Filtered Minimum Shift Keying) coherent demodulation processing system, so as to provide a coherent demodulation processing system which can reduce the complexity of an MSK / GMSK signal demodulation algorithm and improve the signal demodulation performance. According to the technical scheme of the invention, an MSK / GMSK signal demodulation end is in parallel connection with two low pass filters through two 90-DEG phase shifters in a quadrature demodulation module to form a closed loop circuit; the output end of the closed loop circuit is sequentially in serial connection with a post decoding signal demodulation module and an information conversion module through a baseband signal synchronization module to form an MSK / GMSK coherent demodulation system; the baseband signal synchronization module compensates the initial phase of the obtained MSK / GMSK baseband discrete complex signals to zero phase, the signals are then fed to the post decoding signal demodulation module, a real part value and an imaginary part amplitude value are extracted alternatively for each baseband signal; and the information conversion module converts a real number signal no larger than 0 to be a bit 0 and a real number signal larger than 0 to be a bit 1, information bit data are obtained and outputted to subsequent information processing.
Owner:10TH RES INST OF CETC
GMSK spread modulation
ActiveUS20050094711A1Amplitude-modulated pulse demodulationAngle modulationTelecommunicationsSpread spectrum
Spread spectrum GMSK signals are presented. Transmission may involve obtaining a sequence of data symbols, obtaining a spread spectrum code comprising a sequence of spread spectrum chips, generating a sequence of pre-modulation chips by combining the sequence of data symbols with the spread spectrum chips, wherein for each data symbol, at least one of the pre-modulation chips is generated by taking into account at least the data symbol and at least one of the spread spectrum chips, performing Gaussian Minimum Shift Keying (GMSK) modulation using the sequence of pre-modulation chips to produce a spread spectrum GMSK signal, and transmitting the spread spectrum GMSK signal.
Owner:VIASAT INC
Multimode multiband radio-frequency onboard micro-micro cellular communication system based on software defined radio
ActiveCN102076120ALarge channel bandwidthNetwork topologiesRadio networksCode division multiple access
The invention discloses a multimode multiband radio-frequency onboard micro-micro cellular communication system based on software defined radio, which comprises a receiving module, a local oscillator module, a transmitting module and a control module. The radio-frequency micro-micro cellular communication system can support multiple working bands and working modes: 800-1000 MHz (GMSK (Gaussian Minimum Shift Keying) / CDMA (Code Division Multiple Access) 1X), 2.412-2.472 GHz, and 5.0-5.8 GHz (QPSK (Quadrature Phase Shift Keying) / QAM (Quadrature Amplitude Modulation) 16 / OFDM (Orthogonal FrequencyDivision Multiplexing)-QAM 64). In particular environments, such as aircraft flight and the like, the radio-frequency micro-micro cellular communication system can support different radio network services: GSM (Global System for Mobile Communications) (935-960 MHz / 890-915 MHz), CDMA (824-849 MHz / 869-894 MHz), 802.11b / g (WLAN (Wireless Local Area Network) 2.412-2.472 GHz) and 802.11a (WLAN 5.0-5.8GHz) communication systems. The channel bandwidth varies as the operation mode varies. The maximum bandwidth can reach 20 MHz, the maximum radio-frequency output power is 20 dBm, and the noise factorof the receiving machine is less than 9 dB.
Owner:SOUTHEAST UNIV
Efficient high performance demodulation of low bt value gaussian minimum shift keying incorporating turbo equalization
Systems (600) and methods (100) for demodulating a Gaussian Filtered Minimum Shift Keyed (GMSK) signal. The GMSK signal is defined in a transmitted symbol domain where each symbol is given by a product of a current data bit and a previous data bit. The GMSK signal is converted from the transmitted symbol domain to a data symbol domain. The conversion is achieved by approximating filtered complex output signals that would be produced by matched filters having filter shapes corresponding to pulses used in terms of a Laurent expansion. Subsequent to the convention of the GMSK signal, a trellis equalization of the GMSK signal is performed exclusively in the data symbol domain based on the terms of the Laurent expansion.
Owner:HARRIS CORP
Method for jointly demodulating MSK and DSSS and demodulator thereof
InactiveCN101515915AReduce consumptionReduce power consumptionMulti-frequency code systemsTransmitter/receiver shaping networksCommunications systemFrequency compensation
The invention belongs to the technology filed of wireless communication, relating to a method for jointly demodulating MSK (minimum shift keying) and DSSS (direct sequence spread spectrum) and a demodulator thereof. The demodulator comprises an error information obtaining module, a match filter module, a synchronous information trapping module, a demodulating module and a tracking module; and the method for jointly demodulating MSK and DSSS comprises the following steps of: (1) obtaining error information, (2) matching and filtering the error information, (3) trapping synchronous information, (4) demodulating, (5) tracking, or the like, and sending demodulation results to parent process so as to complete communication process. The invention has the advantage of better frequency compensation ability, thereby, solving the problems that a method for dispreading and demodulating direct sequence spread spectrum signals needs to be frequency offset estimated, complex extraction of PN code synchronization and bit synchronization, etc. Compared with the existing dispreading and demodulating method, the invention is simple as needing no carrier recovery module nor bit timing module, and is applicable to the wireless communication system.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Minimum shift keying/Gaussian Filtered minimum shift keying (MSK/GMSK) direct sequence spread spectrum signal receiver
InactiveCN103281275ASimple structureReduce lossesFrequency-modulated carrier systemsFiltrationIntermediate frequency
The invention discloses a minimum shift keying / Gaussian Filtered minimum shift keying (MSK / GMSK) direct sequence spread spectrum signal receiver structure; a receiver comprises an antenna, a radio frequency front-end module, an analog-digital converter, a digital baseband module, a signal acquisition tracking control module and a data demodulation module, wherein the antenna outputs a received signal to the radio frequency front-end module; the radio frequency front-end module carries out frequency conversion, amplification and filtration to the received signal; the analog-digital converter converts the processed signal into a digital medium-frequency signal; the digital baseband module acquires and tracks the input signal based on the control of the signal acquisition tracking control module; and the data demodulation module demodulates the acquired and tracked signal. The receiver has the advantages of simple structure and convenience in realization, and is particularly applicable to demodulating data and meanwhile finding range through a spread spectrum signal.
Owner:INST OF AUTOMATION CHINESE ACAD OF SCI
Flexible gaussian minimum shift keying in a cellular internet of things system
ActiveUS20160105891A1Modulated-carrier systemsCriteria allocationFourier transform on finite groupsFrequency-division multiple access
Methods, systems, and devices are described for wireless communication at a UE. A user equipment (UE) may utilize orthogonal frequency division multiple access (OFDMA) for demodulating downlink messages and a combination of Gaussian minimum shift keying (GMSK) and single carrier frequency division multiple access (SC-FDMA) for uplink modulation. The uplink modulation process may include generating a symbol vector with an M-point discrete Fourier transform (DFT), filtering the symbol vector with a frequency domain Gaussian filter, generating a sample vector from the filtered symbol vector utilizing an inverse DFT, and modulating the sample vector utilizing GMSK. In some cases, the uplink modulation may be based on a narrowband resource allocation received from a base station.
Owner:QUALCOMM INC
DNA and Fingerprint Authentication of Mobile Devices
ActiveUS20160088473A1Expand coverageImprove performanceModulated-carrier systemsUnauthorised/fraudulent call preventionCode division multiple accessControl signal
User generated and processed Deoxyribose Nucleic Acid (DNA) or fingerprint signal is used for authentication of a mobile device. A touch screen generated processed control signal is used for control of mobile device operated in a cellular system and a Wi-Fi network. The mobile device receives, demodulates and processes a location finder signal and provides processed location finder signal to an interface unit of mobile device. From a cellular base station the mobile device receives, demodulates and processes a modulated spread spectrum signal into a received, demodulated and processed baseband spread spectrum signal and processes, modulates and transmits in cascade the processed spread spectrum signal in a Wi-Fi system. The mobile device operates in a repeater mode. In one of the embodiments the spread spectrum signal uses a Code Division Multiple Access (CDMA) modulated signal and the Wi-Fi system uses OFDM modulated signal. The mobile device comprises step of processing a video signal into baseband in-phase and a quadrature-phase cross-correlated spread spectrum or Time Division Multiple Access (TDMA) signal. The video TDMA signal is modulated and transmitted as a Gaussian Minimum Shift Keying (GMSK) modulated signal in said cellular system and wherein said video signal comprises a three dimensional (3D) image
Owner:FEHER KAMILO
Method for improving incoherent detection performance of MSK (minimum shift keying) signals
InactiveCN103078818AIncrease processing rateSampling avoidanceModulated-carrier systemsSignal trackingData transmission
The invention provides a method for improving the incoherent detection performance of MSK (minimum shift keying) signals, and aims at providing the method solving the problem of MSK signal application limitation caused by poorer incoherent detection performance and realization difficulty of coherent detection of the MSK signals. The method provided by the invention is realized through the following technical scheme that in an MSK data transmission receiving machine, a signal capture module stores baseband signals after the down-conversion into a memory, then, a high-speed clock is used for reading out the stored signals from the memory, next, the read signals are subjected to frequency offset compensation and bit synchronization searching according to the pre-divided frequency grooves, and the searching results are sent to a signal tracking module; the signal tracking module realizes the frequency and bit synchronization tracking through a frame head waveform matching correlator according to the capture results sent from the signal capture module; and a correlation judging module carries out correlation calculation on the signals sent by the signal tracking module with the local waveforms, selects the maximum correlation value from the correlation results and adopts the bit of the maximum correlation value corresponding to the middlemost part of the bit flow as the final judgment results to be output.
Owner:10TH RES INST OF CETC
Method and system for increasing the spectral efficiency of binary coded digital signals
ActiveUS20060045539A1Improve spectral efficiencyControl distortionModulated-carrier systemsWavelength-division multiplex systemsFrequency spectrumControl signal
A method and system for increasing the spectral efficiency of binary coded signals includes encoding an input binary bit sequence such that the input binary bit sequence is converted into a series of rectangular pulses having varying repetition rates. A continuous wave carrier signal is then modulated via a control signal representative of the encoded signal. The modulated optical signal is filtered by a narrow band optical filter to generate a minimum shift keying (MSK) encoded optical signal. In accordance with the present invention, an input binary bit sequence is encoded via a minimum shift keying (MSK) modulation format to improve the spectral efficiency of a binary coded digital signal and to contemporaneously limit distortion of the optical signal induced by optical nonlinear effects during transmission in an optical transmission system.
Owner:LUCENT TECH INC +1
System and method for communicating data using constant amplitude equalized waveform
ActiveUS20060215786A1Effective trackingAngle modulationFrequency-modulated carrier systemsTelecommunicationsMapping algorithm
A system communicates data and includes an encoder for encoding communications data with a forward error correction code. A data randomizer randomizes the communications data with a random bit sequence and a combining circuit combines the communications data with known symbols into frames. A modulator maps the communications data into minimum shift keying or Gaussian minimum shift keying (MSK or GMSK) symbols based on a specific mapping algorithm to form a communications signal having an MSK or GMSK waveform over which the communications data can be transmitted.
Owner:HARRIS GLOBAL COMM INC
Improved binary-coded character modulation method of satellite navigation system signals
InactiveCN102033234ARealize anti-jammingImprove compatibilitySatellite radio beaconingUltrasound attenuationSide lobe
The invention relates to an improved binary-coded character modulation method of satellite navigation system signals, belonging to the technical field of satellite navigation. On the basis of binary-coded characters, the traditional spread spectrum character is split into K units; each unit uses the character pulse waveform based on MSK (minimum shift keying) instead of the binary value waveform; and proper parameters are selected, thereby having the advantages of interference rejection, multipath resistance and compatibility of the binary-coded character, realizing the constant enveloping of MSK modulation, enhancing the efficiency of the power amplifier, realizing large side lobe attenuation and the like. The invention uses the improved binary-coded character modulation to enhance the code tracking performance, multipath resistance, interference rejection and compatibility with other navigation signals, thereby realizing constant enveloping of signals and avoiding the occurrence of large-amplitude side lobes.
Owner:SHANGHAI JIAO TONG UNIV
Method for modulating and demodulating minimum frequency shift keying signal and special method for designing complex analytic band-pass filter
InactiveCN101741788AAchieve sharingReduce complexityPhase-modulated carrier systemsTransmitter/receiver shaping networksBandpass filteringLow-pass filter
The invention relates to a method for modulating and demodulating a minimum frequency shift keying signal and a special method for designing a complex analytic band-pass filter. A complex analytic band-pass filtering method is adopted to realize the modulation and demodulation of the minimum frequency shift keying signal; the minimum frequency shift keying signals of different central frequencies do not need various band-pass filters, the minimum frequency shift keying signals of the same transmission bandwidth only need one band-pass filter, and then a processor calculates the complex analytic band-pass filter having the central frequency serving as a carrier frequency, so the complexity of a signal processing algorithm is greatly lowered and sharing among wave filters having the same transmission rate is realized.
Owner:XUCHANG UNIV
GMSK (Gaussian Filtered Minimum Shift Keying) coherent demodulation method capable of rapidly overcoming Doppler shift
ActiveCN108494714ACarrier fast recoveryShort lock timeCarrier regulationSynchronising arrangementDiscriminatorLoop filter
The invention discloses a carrier recovery and clock synchronization method of a GMSK (Gaussian Filtered Minimum Shift Keying) signal capable of rapidly overcoming Doppler shift. The method comprisesthe design of a squaring loop as the main structure of a simple receiver. A phase discriminator module, a loop filter module and a digital voltage controlled oscillator module are included. At the same time, in order to increase the locking speed, the carrier frequency of the GMSK signal is estimated to obtain rough carrier frequency, and then a phase-locked loop is used for locking, thereby effectively shortening the locking time and improves the stability of a locked output signal at the same time. Through adoption of the improved squaring loop structure disclosed by the invention, the accuracy of phase error acquisition is increased, and the phase-locked loop works more stably. The method is applied to the fields of spaceflight test control and deep space communication, and can well meet the communication demand standard.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Frequency shift keying receiver for minimum shift keying, and a method for setting reference PN sequence for frequency shift keying thereof
InactiveUS20060193402A1Substation equipmentFrequency-modulated carrier systemsEngineeringFrequency shift
The invention relates to an FSK receiver for MSK capable of transmitting an MSK-modulated signal via FSK demodulation, and a method for setting a plurality of reference PN sequences thereof. In the FSK receiver for MSK of the invention, an RF converter converts an MSK-modulated RF signal into an IF signal. An FSK receiver FSK-demodulates the IF signal into a chip signal. Also, a correlation array includes an FSK PN sequence table comprising a plurality of reference PN sequences having a plurality of FSK reference chip signals. The correlation array collects the chip signal from the FSK receiver to generate a plurality of PN sequences having a plurality of chip signals, and correlating the generated PN sequences with each of the reference PN sequences to restore raw data. The invention provides the method for setting the plurality of FSK reference PN sequences in the FSK receiver for MSK.
Owner:SAMSUNG ELECTRO MECHANICS CO LTD
System and method for wireless narrowband voice and data communication
ActiveCN102891941ARealize the function of digital intercom communicationRealize digital voice forwarding functionTelephonic communicationFrequency-modulated carrier systemsCommunications systemAnalog signal
Owner:FUJIAN KIRISUN ELECTRONICS
Constant-envelop light OFDM-MSK (orthogonal frequency division multiplexing-minimum shift keying) modulation method
InactiveCN102497351AImprove interferenceImprove performanceElectromagnetic transmissionMultiple carrier systemsFrequency spectrumCarrier signal
The invention discloses a constant-envelop (CE) light OFDM-MSK (orthogonal frequency division multiplexing-minimum shift keying) modulation method, which is capable of minimizing PAPR (peak to average power ratio) and dropping the border of the frequency spectrum quickly so as to reduce interference among carrier waves, enhances resistance capability of the light OFDM system to interference of nonlinearity and subcarriers and accordingly improves the performances of long-distance large-capacity light OFDM transmission system. The modulation method includes the following steps: (1) a transmitting end generates OFDM-MSK signals; (2) the signals generated in the step (1) are subjected to digital-to-analogue conversion and optical phase modulation so as to generate CE-OFDM-MSK light signals to be sent to optical fibers; (3) a receiving end receives the CE-OFDM-MSK light signals by means of relative detection and the CE-OFDM-MSK light signals are subjected to phase modulation to be OFDM-MSK signals; and (4) source end data are acquired by means of modulation reverse to the modulation process of generating the OFDM-MSK signals.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Cascade-mode-based quaternary minimum-shift keying ( MSK) modulation method and device
InactiveCN102014092AConstant envelopePhase continuousFrequency-modulated carrier systemsBand-pass filterComputer module
Owner:HUAZHONG UNIV OF SCI & TECH
230 MHz wireless communication speed self-adaptive designed-to-change collection terminal
ActiveCN102695301AEliminate consumptionSolve communication problems in communication blind spotsTransmission systemsWireless communicationGeneral Packet Radio ServiceCode division multiple access
The invention relates to a 230 MHz wireless communication speed self-adaptive designed-to-change collection terminal. A signal output / input end of an interface unit is correspondingly connected with a first signal input / output end of an adapter plate, the signal output / input end of a processing and displaying unit is correspondingly connected with a second signal input / output end of the adapter plate, the signal output / input end of a communication unit is correspondingly connected with a third signal input / output end of the adapter plate, and a power supply output end is connected with power supply input ends of the adapter plate, the communication unit, the processing and displaying unit and the interface unit. The 230 MHz wireless communication speed self-adaptive designed-to-change collection terminal disclosed by the invention has the advantages of having a 230 HMz private network channel with three different speed and modulation modes of 2400bps-MSK (Minimum Shift Keying), 9600bps-GMSK (Gaussian Filtered Minimum Shift Keying) and 19200bps-4FSK (Frequency Shift Keying), different systems and field conditions can be adapted, and a GPRS (General Packet Radio Service) or CDMA (Code Division Multiple Access) public network channel can be used for logging in and operating through the issuing or the manual setting of a main station when the 230 HMz private network channel is not in existence or a public network channel needs to be used.
Owner:NANJING XINLIAN ELECTRONICS +1
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