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51 results about "Chaos shift keying" patented technology
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Multi-carrier difference chaos shift keying modulation and demodulation method and modem
ActiveCN106161310AReduce noise componentsLow Bit Error PerformancePhase-modulated carrier systemsModem deviceCarrier modulation
The invention discloses a multi-carrier difference chaos shift keying modulation and demodulation method and a modem. The method comprises the following steps: acquiring a DCSK reference signal in a current symbol period; converting a to-be-transmitted M-N serial data bits into M-N parallel data bits; completing information modulation and generating M-N DCSK information signals; completing multi-carrier modulation and generating N-path modulated DCSK reference signals and M-N path modulated DCSK information signals; adding N-path DCSK reference signals and M-N path DCSK information signals and then sending; completing multi-carrier modulation and respectively recovering disperse DCSK reference signal sequences and disperse DCSK information signal sequences; acquiring averaged DCSK reference signal sequence and respectively relating to M-N path disperse DCSK information signal sequences, thereby acquiring M-N related values; completing threshold judgment and outputting M-N path demodulation data bits; merging M-N path demodulation data bits into one path serial demodulation data bit stream. According to the multi-carrier difference chaos shift keying modulation demodulation method, the noise component in the judged variable can be reduced and the bit error performance of the system can be increased.
Owner:江苏中业信息科技有限公司
Differential chaos shift keying modem and modulation method based on two-path index modulation
ActiveCN108365945AReduce usageIncreased bit rateSecuring communication by chaotic signalsMultiple carrier systemsFrequency spectrumModem device
The invention discloses a differential chaos shift keying modem and a differential chaos shift keying modulation method based on two-path index modulation, and relates to the technical field of chaoscommunication. A two-path index modulation method is used for transmitting a chaos reference signal and a Hilbert reference signal orthorhombic with each other, and an index mapping rule and an inverted index mapping rule are used for modulating and demodulating the signals. According to the modulation method provided by the invention, delay units are used in a transmitting terminal and a receiving terminal; compared with an existing carrier-index differential chaos shift keying (CI-DCSK) technology, under the premise of occupying a same frequency band, the method synchronously transmits two information signals, so that a bit transmission rate of the system is doubled; in addition, the higher spectrum utilization rate and better data security are achieved, and the method provided by the invention is reduced in bit error rate (BER), and shows better bit error rate performance, and the advantages of the BER performance becomes more significant along with the increasing of a bit signal tonoise ratio.
Owner:NANJING UNIV OF POSTS & TELECOMM
Correlation delay-differential chaos shift keying-based modulation communication method
InactiveCN101986632ASimple structureImprove confidentialityModulated-carrier systemsInterference resistanceData transmission
The invention provides a correlation delay-differential chaos shift keying (CD-DCSK)-based modulation communication method with the advantages of high antijamming capacity, simple circuit structure and low cost. A chaos signal at a transmitting end is subjected to related delay transmission; in front and back two-half symbol periods, two useful signals are transmitted simultaneously; and at a receiving end, the useful signals are subjected to related delay operation of a correlator and are respectively demodulated into useful signals a and b, and the useful signals a and b are subjected to serial conversion to form the original transmitting signals. The method has the advantages of high security of correlation delay shift keying (CDSK), low error rate of differential chaos shift keying (DCSK) and the like; and signals transmitted in channels are more uniform, and have high security and low error rate, and the data transmission rate is 2 times that of the DCSK. Besides, on the implementation of hardware circuits, the CD-DCSK is simpler than QCSK (quadrature chaos shift keying). The method ensures high security, high data transmission rate, higher antijamming capacity and low cost, and is easy to promote.
Owner:HEILONGJIANG UNIV
Differential chaos shift keying communication method based on hybrid system
InactiveCN105515683AGuaranteed reliabilityEasy to implementTransmissionSignal-to-noise ratio (imaging)Communications system
The invention discloses a differential chaos shift keying communication method based on a hybrid system, which comprises the steps of: S1, setting communication system parameters; S2, preparing binary information to be sent, and presetting the binary information; S3, generating a chaos signal u1; S4, preparing a transmitting signal u3; S5, carrying out chaos matching filtering on a receiving signal; and S6, judging a polarity of a code element, respectively carrying out related operations on two segments of signals, and until decoding to obtain a recovered signal, completing communication. According to the method disclosed by the invention, a system structure is effectively simplified on the basis of ensuring reliability of a communication system, and the method is easy for implementation and integration of a microprocessor; the method can normally work at a low signal-to-noise ratio, so that reliability of the communication system is improved; and the transmission signal adapts to a channel bandwidth, and resistance to narrow-band interference is low.
Owner:XIAN UNIV OF TECH
Multivariate orthogonal chaos shift keying modulation/demodulation method
ActiveCN105187347AReduce usageReduce the numberMultiple carrier systemsCarrier signalWalsh sequences
The invention discloses a multivariate orthogonal chaos shift keying modulation / demodulation method. According to the method, Hilbert orthogonal transformation and orthogonal Walsh sequence weighting are carried out chaos signals to construct a plurality of mutually- orthogonal chaos carrier signals; and the modulation / demodulation is carried out by utilizing a multivariate orthogonal modulation method. According to the multivariate orthogonal chaos shift keying modulation / demodulation method, the delay units in the existing binary / N-nary DCSK receivers are eliminated, the delay units in transmitters are decreased, the realizing complexity is reduced, the bit transmission speed of the system is greatly improved and the bit error rate performance of the system is enhanced to a relatively great extent.
Owner:NANJING UNIV OF POSTS & TELECOMM INST AT NANJING CO LTD
MIMO secret communication method based on differential chaos shift keying
InactiveCN104009834AImprove reliabilityIncrease capacitySecuring communicationCommunications systemTransfer procedure
The invention discloses an MIMO secret communication method based on differential chaos shift keying (DCSK). Due to improvement, information is made to be dispersed on two channels for transmission, the reference signal of each way of information is transmitted on the other way, and therefore even when a certain way of information is intercepted in the transmission process, an original signal can not be decoded, and meanwhile, the problem that the utilization rate of the channels is low is solved. Meanwhile, in order to solve the multi-path fading problem, the MIMO technology is used for suppressing the channel noise and the multi-path fading, and the system bandwidth and the transmission power do not need to be increased. By comparing the bit error rate of an original system with the bit error rate of an improved system, it is found that the bit error rate of the MIMO-DCSK secret communication system is lower than that of a traditional system in data transmission, meanwhile, the utilization rate of the channels is higher, and the secrecy is higher.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Improved type differential chaos shift keying DCSK confidentiality communication method
InactiveCN103905358ALow transfer ratePoor confidentialityModulated-carrier systemsSecuring communicationConfidentialityTransfer procedure
The invention discloses a confidentiality communication method based on an improved type DCSK, and belongs to the technical field of signal transmission. In response to the confidentiality problem of the DCSK, after the improvement, information is scattered to two communication channels to be transmitted, a reference signal of the information in each channel is transmitted in the other channel, so that even the information in one channel is intercepted and captured in the transmission process, the original signal cannot be decoded, and the problem of low channel utilization rate is solved. Through the comparison of the original system bit error rate with the improved system bit error rate, the bit error rate of the improved type DCSK system is lower than the bit error rate of the traditional system in the data transmission process, and the channel utilization rate is much higher and confidentiality is much stronger. Through simulation it can be seen that the simulation result is consistent with the theoretical analysis, and confidentiality is greatly enhanced. Meanwhile, the improved type differential chaos shift keying DCSK confidentiality communication method is relatively low in complexity, easy for the project to be realized, and will has wide application prospect in the fields of images, military confidential information and the like.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Efficient chaotic communication scheme based on orthogonal chaotic generator
InactiveCN105915480ANo distractionsSimple structureModulated-carrier systemsCarrier signalSignal-to-quantization-noise ratio
The invention provides an efficient chaotic differential communication scheme based on an orthogonal chaotic generator, and belongs to the field of communication systems. A DCSK (Differential Chaos Shift Keying) signal frame is extended in order that each frame includes N equal-length time slots, and a system modulates chaotic carrier waves in the time slots, namely, each time slot carries 1 bit of user data. Each time slot takes a signal in a previous time slot as a reference signal. A reference signal of a first time slot is in a last time slot of a previous frame, namely, a last time slot of each frame carries user information of the time slot and a signal which can be converted into a reference signal of a next frame. Meanwhile, the orthogonal chaotic generator is designed to generate strictly-orthogonal chaotic signals in order that the chaotic carrier wave of each frame and a carrier wave of an adjacent frame are kept orthogonal, and the system is free from inner-signal interference. An incoherent demodulation way is adopted at a demodulation end; correlation operation is performed on signals in front and back adjacent frames through a correlator; and user data can be judged through a judgement threshold. According to the scheme, the transmission rate is two times that of DCSK, and bit error rate performance is superior to that of DCSK in any signal-to-noise ratio range.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Code multiplexing DCSK (Differential Chaotic Shift Keying) modulator-demodulator based on PFDM (Orthogonal Frequency Division Multiplexing) technology
ActiveCN107426124ARespond to different problemsReduce the impactMulti-frequency code systemsModem deviceSignal on
The invention relates to a code multiplexing DCSK (Differential Chaotic Shift Keying) modulator-demodulator based on a PFDM (Orthogonal Frequency Division Multiplexing) technology, and relates to DCSK modulation and demodulation. By utilizing orthogonality of a Walsh code, orthogonality of a reference signal and an information carrying signal on a code domain and overlapping of the reference signal and the information carrying signal on a time domain are implemented, and the problems of different channel responses and poor transmission performance of the reference signal and the information carrying signal, which are caused by channel time selection, are solved; and by utilizing the OFDM technology, each code chip of one frame of signal is propagated on different sub carriers, so that the problem of intersymbol interference caused by channel frequency selection is avoided. Simulation under an Additive White Gaussian Noise (AWGN) channel and a multi-path time-varying channel shows that compared to conventional DCSK, the code multiplexing DCSK system based on the PFDM technology has good transmission performance under the AWGN channel and the multi-path time-varying channel and has resistance to time selection and resistance to frequency selection fading.
Owner:XIAMEN UNIV
Wide band-DCSK modulation method, transmitting apparatus thereof, wide band-DCSK demodulation method, and receiving apparatus thereof
InactiveUS20060198522A1Reduce manufacturing costReduce power consumption costsCode division multiplexSecuring communication by chaotic signalsEngineeringWide band
Provided are a wide band-differential chaos shift keying modulation method, a transmitting apparatus adopting the wide band-differential chaos shift keying modulation method, a wide band-differential chaos shift keying demodulation method, and a receiving apparatus adopting the wide band-differential chaos shift keying demodulation method. The wide band-differential chaos shift keying modulation method includes: generating a wide band chaotic signal; delaying the wide band chaotic signal; multiplying the delayed wide band chaotic signal by an information signal to output a multiplied signal; and performing a switching operation so as to alternately transmit the wide band chaotic signal and the multiplied signal. Thus, the invention can be realized without an APLL, a mixer, an FM modulator, and the like, to reduce power consumption and manufacturing cost for the transmitting apparatus. Thus, noise characteristics and security performance can be high, and the wide band-DCSK modulation method can be robust to multi-path.
Owner:SAMSUNG ELECTRONICS CO LTD
Reference diversity design algorithm of multistage code shift differential chaotic shift keying system
InactiveCN110417695AReduce distractionsImprove BER performanceCode division multiplexMulti-frequency code systemsEngineeringDiversity scheme
The invention discloses a reference diversity design algorithm of a multistage code shift differential chaotic shift keying system, and relates to a modulation technology in a wireless communication technology. A transmitter uses the orthogonal characteristic of a walsh code sequence to superpose a reference signal with reference diversity and a plurality of information bearing signals on the sametime slot to obtain a transmission signal, and the transmission signal passes through a wireless channel and is influenced by multipath fading and additive white Gaussian noise; the reference signalsdamaged by the noise are averaged by the receiver to reduce the interference of the noise on the reference signals, the denoised smooth reference signals are correlated with the information bearing signals to obtain decision variables, and hard decision is performed on the decision variables to obtain information estimation bits; and a theoretical BER of the proposed system is derived through a decision variable, and an optimal reference diversity number of the MCS-DCSK-RD system is determined according to the theoretical BER. System noise can be reduced, and the system performance is improved.
Owner:XIAMEN UNIV
Three-channel carrier index differential chaos shift keying modem and method
ActiveCN109587090AImprove bit error rate performanceImprove security and confidentialityModulated-carrier systemsSecuring communication by chaotic signalsIndex mappingModem device
The invention discloses a three-channel carrier index differential chaos shift keying modem and method, which belong to the technical field of chaos communication. Three-channel index modulation is realized by two layers in an inter-channel mutual reference mode, the two layers of modulation are distinguished by chaotic signals and Hilbert signals which are mutually orthogonal, and the signals aremodulated and demodulated by using an index mapping rule and an anti-index mapping rule. On the premise of occupying the same frequency band, in comparison with the existing carrier index differential chaos shift keying system whose reference signals only serve as reference of information signals but do not carry any information, the information signals of each layer in the invention can also serve as reference signals for other layers in the case of information bit transmission, independent reference signals do not need to be transmitted additionally, and thus, a higher bit transmission rate, a higher spectrum utilization rate and better data security can be acquired, and the bit error rate can also be reduced.
Owner:NANJING UNIV OF POSTS & TELECOMM
Fusion code index-modulated multi-ary differential chaos shift keying modem
InactiveCN106817330AHigh data rateEliminate delay circuitPhase-modulated carrier systemsMultiple carrier systemsMultiplexingModem device
The invention provides a fusion code index-modulated multi-ary differential chaos shift keying modem and relates to the field of wireless communication, wherein a receiver is free of any delay unit. Meanwhile, the fusion code index-modulated multi-ary differential chaos shift keying modem improves the system transmission data rate. The subscript value of a Walsh code is adopted as a carrier for the transmission of information bits, so that the number of bits transmitted by the system is improved. The transmission data rate and the energy efficiency of the system are improved effectively. In the orthogonal code multiplexing manner, delay units are effectively eliminated, and the complexity of system implementation is lowered. The simulations of AWGN channels and multi-path rayleigh fading channels show that, compared with the conventional DCSK, the fusion code index-modulated multi-ary DCSK system has certain performance advantages.
Owner:XIAMEN UNIV
Synchronization method of differential chaos shift keying or frequency-modification differential chaos keying ultra wideband system
InactiveCN104393977AReduce implementation complexityShorten the timeSynchronising arrangementUltra-widebandComputation complexity
The invention relates to a synchronization method of a differential chaos shift keying or frequency-modification differential chaos keying ultra wideband system. The synchronization method comprises the following steps: step 1, averagely dividing an initial search region into four secondary regions, compressing the search region into one of the secondary regions by a method of adopting the characteristics of quite high autocorrelation and quite weak cross correlation of chaos signals and comparing the energy of useful signals collected in each secondary region, and letting n be equal to 2; step n, averagely dividing the search region determined in the last step into two secondary regions, setting the midpoint of each secondary region as an integral start point, comparing the two obtained integral results, determining the region of the larger integral result as a new secondary region, setting the midpoint of the secondary region as an estimated synchronization time, letting n be equal to N+1, ending the algorithm if n is larger than N, otherwise executing the n step of algorithm. The method disclosed by the invention greatly shortens the time needed by synchronization and is quite low in computation complexity so that the implementation complexity of a receiver is effectively reduced.
Owner:CHINA YOUKE COMM TECH
Improved multi-user DCSK chaotic communication system
InactiveCN111770040AImprove bit error performanceModulated-carrier systemsSecuring communication by chaotic signalsCommunications systemSignal generator
The invention discloses an improved multi-user DCSK chaotic communication system, and belongs to the technical field of communication. A traditional differential chaos shift keying (DCSK) modulation technology is improved so as to achieve the purpose of improving the bit error rate performance. An improved chaotic signal generator is used at a sending end to generate a group of orthogonal chaoticsequences xi and k, so that each path of information signal can transmit two bits and is expanded into multiple users, and each frame of signal can transmit 2N information bits. At a receiving end, received signals ri and k are converted through an editor used by the sending end, then corresponding correlation operation is carried out, and after threshold judgment is carried out, corresponding bitinformation can be recovered, wherein the threshold judgment criterion is as follows: if the output result of the related demodulator is greater than or equal to 0, the sent information signal is judged to be '+1'; otherwise, it is judged that the sent information signal is'-1'. Compared with a DCSK system, an OMU-DCSK system and an NISI-MU-CDSK system, the system provided by the invention has better error code performance. Therefore, the improved multi-user DCSK chaotic communication system has important application value in the field of communication.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Demodulation method for bipolar chaos shift keying communication system
InactiveCN102143111ASolve the defect of high bit error rateModulated-carrier systemsCommunications systemMean square
The invention relates to a demodulation method for a bipolar chaos shift keying communication system, belonging to the technical field of communication. Aiming at the problem of high bit error ratio during the coherent demodulation process when the synchronizing characteristics are not ideal in the bipolar chaos shift keying communication system, the invention adopts the technical scheme that twodifferent chaotic signal trackers are used to respectively track the received modulated chaotic signals, and the mean square errors for the tracked signal and the received signal are calculated and compared to distinguish the transmitted data. The chaotic signal tracking method adopts two algorithms: extended Kalman filter and particle filter, and the results show that compared with the traditional coherent demodulation method, the demodulation method of the invention greatly reduces the bit error ratio when the synchronizing characteristics are not ideal; and the bit error ratio of the particle filter algorithm is superior to that of the extended Kalman filter algorithm.
Owner:HENAN POLYTECHNIC UNIV
CD-DCSK chaos communication scheme without signal mutual interference
InactiveCN109347619AGood bit error performanceIncrease transfer ratePhase-modulated carrier systemsSecuring communication by chaotic signalsInformation transmissionData information
The invention discloses a CD-DCSK chaos communication scheme without signal mutual interference, and the scheme belongs to the technical field of communication. The conventional CDSK (Correlation Delay Shift Keying) modulation technology is combined with the DCSK (Differential Chaos Shift Keying) modulation technology, a simple orthogonal chaos signal generator is used, thus, an aim of improving error code performance without changing information transmission rate of a CDSK system can be realized. A receiving end extracts data information through related demodulation. Correlation operation isexecuted for received signals and corresponding delay signals thereof through a correlator, then, threshold decision making is executed respectively, thus, data information can be recovered. A threshold decision making criterion is as follows: if an output result of a correlation demodulator is greater than or equal to 0, judging that the sent information signal is '+1'; and otherwise, judging that the sent information signal is '-1'. The information transmission rate of the scheme is twice of the information transmission rate of a DCSK system, and error code performance is improved remarkablyin comparison with the CDSK system. So, the scheme provided by the invention has important application value in the field of communication.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
New differential chaos shift keying communication method
InactiveCN107222441AAvoid defectsImprove transmission efficiencyModulated-carrier systemsSecuring communication by chaotic signalsIntegratorElectrical polarity
Aiming at the disadvantages that a differential chaos shift keying method is low in communication efficiency and low in security, the invention proposes a new differential chaos shift keying communication method, which comprises a transmitting end and a receiving end. Chaotic signals of the transmitting end are divided into two paths, one path is directly outputted and the other path is subjected to chaotic mapping delay and then additively delayed via the previous sending data; and when the outputted signals are multiplied by the latter sending data, then a sending signal is obtained by keying; and the receiving end is divided into an upper branch and a lower branch after being subjected to chaotic mapping delay, wherein the upper branch passes through an integrator and the upper branch passes through a delay integrator; after that, an absolute value is calculated and then the previous sending data are compared and outputted, and then the latter sending data are obtained through the result of output polarity judgment of a selector.
Owner:HENAN POLYTECHNIC UNIV
OFDM-DCSK communication system
ActiveCN104618297AImprove performanceSolve the RF delay problemMulti-frequency code systemsFrequency spectrumData stream
The invention discloses an OFDM-DCSK (Orthogonal Frequency Division Multiplexing-Differential Chaos Shift Keying) communication system and relates to the wireless communication field. The purpose of the invention is that the data rate is increased in the OFDM-DCSK communication system to solve the delay problem of RF (radio frequency). As an irrelevant chaos communication solution, all subcarriers are divided into several groups, chaos reference sequences are transmitted by the central subcarrier in each group, and modulated data streams are transmitted by the subcarriers in the residual groups. Thus, in comparison with a traditional DCSK system, the spectrum utilization rate is improved by a transmitting structure. The received data on a receiving end isn't demodulated by a radio frequency delay circuit, so that a convenient condition is provided to the system in practical application. The system is applied to wireless communication occasions.
Owner:HARBIN INST OF TECH
Orthogonal multi-user chaos shift keying communication scheme
InactiveCN109412988AProof of correctnessModulated-carrier systemsCode division multiplexCommunications systemSignal generator
The invention requests for protecting an orthogonal multi-user chaos shift keying communication scheme, and belongs to the field of communication systems. A system utilizes an orthogonal chaos signalgenerator to generate two orthogonal chaos signals, and the two orthogonal chaos signals are added together to serve as a reference signal. Different information signals are distinguished by delayingfor different times; each information signal transmits N pieces of user information that are distinguished by Walsh codes; the first and second orthogonal chaos signals are sequentially taken to be multiplied with user information added together to acquire an information signal. By using the orthogonal chaos signal generated by the orthogonal chaos signal generator, the interference in the signalcan be thoroughly eliminated, and the bit error rate performance of the system can be effectively improved. The scheme deduces and simulates a bit error rate formula under AWGN and Rayleigh fading channels. A simulation result indicates that the system can enhance the transmission speed and improve the bit error rate, and has good application value.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Space time block code-differential chaos shift keying video transmission method for scalable video coding and decoding device
ActiveCN104394414AHigh average PSNR valueGood video visual qualityDigital video signal modificationComputer architectureVideo transmission
The invention discloses a space time block code-differential chaos shift keying video transmission method for a scalable video coding and decoding device and relates to a video transmission method. The space time block code-differential chaos shift keying video transmission method for the scalable video coding and decoding device is aimed to improve the average PSNR value of the video transmission and the visual quality of the video transmission. The space time block code-differential chaos shift keying video transmission method for the scalable video coding and decoding device provides the STBC-DCSK structure with low receiving end detection complexity for the SVC video transmission. The sending end uses four sending antennas, and each two sending antennas form one group. The space time block code-differential chaos shift keying video transmission method for the scalable video coding and decoding device mainly designs a novel STBC-DCSK code word structure, the bit error rate performance can be effectively improved by means of the transmission structure, and meanwhile, the novel STBC-DCSK code word structure is suitable for the SVC video transmission.
Owner:HARBIN INST OF TECH
Communication system for encrypting information through chaotic signal
InactiveCN104869566AOvercome the disadvantages of poor confidentialityImprove securitySecurity arrangementCommunications systemEngineering
The invention relates to the technical field of secret communication, in particular to a communication system for encrypting information through a chaotic signal. The communication system comprises a signal transmitting end and a signal receiving end, wherein an analog signal input port and an antenna A are arranged on a shell of the signal transmitting end; an analog signal output port and an antenna B are arranged on a shell of the signal receiving end; an A / D conversion module, a chaotic signal generating module, an FM-DCSK (Frequency-Modulated Differential Chaos Shift Keying) modulation module, a radiofrequency modulation module and a power transmitting module are arranged in the shell of the signal transmitting end; a filtering and amplifying module, a radio frequency demodulation module, an FM-DCSK demodulation module and a D / A conversion module are arranged in the shell of the signal receiving end; encryption processing of an input signal is realized through the signal transmitting end; and decryption of received encrypted information is realized through the signal receiving end. Through adoption of the communication system, the problem of poor secrecy in current wireless communication is solved, and chaotic encryption processing of transmitted signals is realized, so that the security and reliability of wireless communication are enhanced.
Owner:HUBEI NORMAL UNIV
Differential chaos shift keying modulator and method for re-differential permutation indexing
InactiveCN113114600AReduce bit error rateImprove bit error performanceModulated-carrier systemsTransmission monitoringTelecommunicationsChaos shift keying
The invention relates to a differential chaos shift keying modulator with re-differential permutation indexing. In a DPI-DCSK single-user transmission scheme, reference signals of (n + 1) bits transmitted each time are information bearing signals of the first (n + 1) bits at the same time, so compared with a PI-DCSK system, chaotic reference signals without bearing bit information are transmitted; according to the DPI-DCSK scheme, the problem of waste of transmission energy is solved. Compared with the traditional PI-DCSK system, the method provided by the invention has better bit error performance, effectively reduces the bit error rate and saves half of transmission energy.
Owner:FUZHOU UNIV
A kind of multi-carrier differential chaotic shift keying modulation and demodulation method and modem
ActiveCN106161310BReduce noise componentsLow Bit Error PerformancePhase-modulated carrier systemsModem deviceCarrier signal
Owner:江苏中业信息科技有限公司
Dual-mode multi-carrier differential chaotic shift keying modulation method and transmitter
ActiveCN111628955AImprove frequency band utilizationLower peak-to-average ratioMultiple modulation transmitter/receiver arrangementsMulti-frequency code systemsConvertersSoftware engineering
The invention discloses a dual-mode multi-carrier differential chaotic shift keying modulation method and a transmitter. The transmitter comprises a subcarrier generator, a chaotic signal generator, anormalization processor, an S / P converter, an index selector, a polarity converter, a modulation multiplier, a carrier multiplier, an N-IFFT processor, a CI code encoder and a P / S converter. Index modulation is introduced, and meanwhile CI codes are introduced to expand signals. On the basis of improving the frequency band utilization rate of the system, the effect of reducing the peak-to-averageratio of the system is more obvious.
Owner:NANJING UNIV OF POSTS & TELECOMM
Method and transmitting structure of multicarrier differential chaos shift keying system PAPR
ActiveCN110855419AReduce performanceCommunication confidentiality is goodSecuring communication by chaotic signalsMulti-frequency code systemsConvertersBinary multiplier
The invention discloses a method and a transmitting structure of a multicarrier differential chaos shift keying system PAPR. The method comprises the following steps: sorting input signals, performingpacket transmission on signals obtained by multiplying modulated signals by chaotic signals, and introducing CI codes to expand the signals; the transmitting structure comprises a chaotic signal generator, a normalization processor, an input signal module, a signal encoder, a PSK modulator, a serial-parallel converter, N modulation multipliers, a CI code encoder and an inverse Fourier processor.Compared with an existing method under a multi-carrier differential chaos shift keying system, the influence of a modulation signal system on the peak-to-average ratio of the system can be ignored, and the effect of reducing the peak-to-average ratio of the system is more obvious.
Owner:NANJING UNIV OF POSTS & TELECOMM
Multipath multivariate differential chaos shift keying iterative receiving method
The invention discloses a multipath multivariate differential chaos shift keying iterative receiving method, and belongs to the technical field of demodulation in a wireless communication technology.The method comprises the steps of: transmitting a reference signal and a information bearing signal through a plurality of parallel paths, performing correlation operation on the received reference signal and the information bearing signal at a receiving end to obtain a correlation value and a likelihood value; and using the likelihood value as a weight to carry out weighted summation on each signal to obtain a new reference signal, so that the noise of the reference signal is reduced, feedback iteration is carried out by using the new reference signal, the BER performance of the system is improved, and finally, the effectiveness is verified by using computer simulation. Simulation under an AWGN channel and a Rayleigh fading channel shows that the multi-channel multivariate DCSK iterativereceiving method can provide the reliability of the system. By using the iterative receiver provided by the invention, the reference signal is iteratively updated at the receiving end without transmitting a copy of the reference signal, so that the noise is suppressed, the BER performance of the system is improved, and the transmission reliability of the system is improved.
Owner:XIAMEN UNIV
Fractional order multi-carrier multi-code-shift multi-system differential chaos shift keying modulation and demodulation method and modem
ActiveCN113630356AImprove confidentialityReduce noise componentsCarrier regulationHigh level techniquesModem deviceCarrier signal
The invention discloses a fractional order multi-carrier multi-code-shift multi-system differential chaos shift keying modulation and demodulation method and a modem, and relates to the technical field of communication signal processing. The modulation and demodulation method comprises the steps: carrying out the serial-parallel conversion of a to-be-transmitted multi-system information packet into P-path parallel multi-system information, carrying out the bit / symbol conversion to obtain P-path multi-system parallel constellation symbols, and meanwhile, generating a fractional order chaotic signal by a fractional order chaotic generator; generating a Walsh code by a Hadamard matrix, selecting a signal obtained by multiplying a first Walsh sequence by a fractional order chaos signal as a reference signal, multiplying other 2P different Walsh sequences by the fractional order chaos signal, inputting the multiplied signals into a multi-system DCSK modulator, respectively acquiring P paths of multi-system DCSK modulation signals through modulation, adding the reference signal and the P paths of multi-system DCSK modulation signals, after completing multi-carrier modulation, sending the information to a channel for transmission, and carrying out related demodulation at a receiving end to recover original information. According to the method, the bit error rate is lower, the higher data rate is realized, and the confidentiality is higher.
Owner:HUNAN INST OF TECH
Multi-carrier multi-element differential chaotic shift keying noise suppression system and method
ActiveCN111988253ASuppress noiseReduce noiseMulti-frequency code systemsBinary multiplierCarrier signal
The invention discloses a multi-carrier multi-element differential chaos shift keying noise suppression system and method, and belongs to the field of noise suppression in a wireless communication technology. A system transmitting terminal comprises a chaotic signal generator, a serial / parallel converter, a bit / symbol converter, a multivariate DCSK modulator, a pulse shaping filter, a multiplier and an adder. And A receiving terminal comprises a matched filter, a sampling module, an averaging module, a noise suppression module and a multivariate DCSK modulator. A correlation coefficient of a received reference signal and an information bearing signal is used as a weight factor at a receiving terminal, the weight factor is used as feedback to update the previous reference signal and the information bearing signal and suppress noise in the transmission signal, and the effectiveness of the proposed method is verified by computer simulation. Under an additive white Gaussian noise channel and a multipath fading channel, the noise in a transmission signal is significantly reduced, and the bit error rate performance of the system is improved. And the system and method having a wide application prospect in future wireless communication application.
Owner:XIAMEN UNIV
All digital non-conventional chaotic communication systems for resilient communications and signaling
ActiveUS20210328840A1Multiple modulation transmitter/receiver arrangementsForward error control useSymbol mappingAnalog signal
An all-digital spread-spectrum type communications system employing chaotic symbol modulation. The system includes a transmitter having a symbol mapper that converts a series of information bits to a series of bit symbols, a digital chaos modulator employing an M-ary chaotic shift keying (M-CSK) architecture for chaotically spreading the bit symbols in the digital domain, where the chaos modulator includes a separate chaos generator for each of the M-CSK symbols, and a digital-to-analog converter (DAC) for converting the chaotic modulated bit symbols to an analog signal for transmission. The system also includes a receiver responsive to the analog signal from the transmitter and generating a received signal therefrom. The receiver performs signal acquisition and tracking on the received signal using a look-up table, a transmitter ID and a receiver ID in the received signal, de-spreading and de-modulation on the received signal and bit removal from the symbols in the received signal.
Owner:NORTHROP GRUMMAN SYST CORP
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