WO2017107316A1 - Procédé de communication à modulation par déplacement de chaos différentielle basé sur un système hybride - Google Patents

Procédé de communication à modulation par déplacement de chaos différentielle basé sur un système hybride Download PDF

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Publication number
WO2017107316A1
WO2017107316A1 PCT/CN2016/075967 CN2016075967W WO2017107316A1 WO 2017107316 A1 WO2017107316 A1 WO 2017107316A1 CN 2016075967 W CN2016075967 W CN 2016075967W WO 2017107316 A1 WO2017107316 A1 WO 2017107316A1
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signal
symbol
chaotic
transmitted
binary information
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PCT/CN2016/075967
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English (en)
Chinese (zh)
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任海鹏
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西安理工大学
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
    • H04B13/02—Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects

Definitions

  • the invention belongs to the technical field of spread spectrum communication, and relates to a differential chaotic keying communication method based on a hybrid system.
  • Underwater communication has a vital impact in the fields of ocean exploration, ocean monitoring, development, and national defense.
  • the underwater communication network provides information transmission and communication for detection, remote control, and security protection for different users, and can also serve marine environmental pollution. And geological hazard forecasting to achieve a wide range of unmanned surveillance; in addition, the use of underwater communications in the military field can establish anti-reconnaissance and early warning network systems.
  • the wave and electromagnetic wave propagation in seawater is greatly attenuated and cannot be used for information transmission above medium distance. It is far from meeting the needs of human marine activities, and the sound signal can travel thousands of kilometers in the water, which makes underwater acoustic communication become these. Reliable protection of the application.
  • the object of the present invention is to provide a hybrid chaotic keying communication method based on hybrid system, which solves the problem that the prior art underwater acoustic communication is constrained by factors such as multipath transmission, amplitude attenuation, characteristic time variation and environmental noise in the underwater channel. Poor sex.
  • the technical solution adopted by the present invention provides a hybrid chaotic keying communication method based on a hybrid system, the method comprising the following steps:
  • Step 1 setting communication system parameters, wherein
  • the rate at which the information is sent is R b , the unit is bit/s, the corresponding symbol period is T b , the frequency of the spread spectrum signal is f, and the generation rate of the symbol of the hybrid system is R c , the unit is bit/s, switching
  • Step 2 Prepare binary information to be sent, where
  • the chaotic signal u 1 is generated using the following hybrid system model:
  • Step 4 preparing to transmit a signal, wherein
  • u 1 (t), (i-1) is transmitted in the first half of the symbol period (i-1) T b ⁇ t 1 ⁇ (i-1)T b + T b /2 T b /2 ⁇ t ⁇ iT b /2 as a reference signal; in the second half of the symbol period (i-1) T b + T b /2 ⁇ t 1 ⁇ iT b is transmitted in the first half of the symbol period
  • the signal is multiplied by the signal to be transmitted +1 or -1, wherein t 1 is the time constant of the transmission variable, and the transmitted signal u 3 is obtained ;
  • Step 5 performing chaotic matching filtering on the received signal, where
  • the transmission signal u 3 After the transmission signal u 3 passes through the channel, it is converted into a received signal v obtained by the receiving end. After receiving, the receiving end sends the received signal v to the chaotic matched filter for chaotic matching filtering, as shown in the following formula:
  • ⁇ is the chaotic matched filter output and ⁇ is the intermediate variable
  • Step 6 determining the polarity of the symbol, wherein
  • the portion (i-1) T b ⁇ t 1 ⁇ iT b corresponding to the i-th binary information in the output signal ⁇ of the chaotic matched filter is divided into the first half of the symbol period according to the symbol period, and is respectively recorded as:
  • the recovery signal of the first symbol is The recovery signal of the second symbol is By analogy, the decoded signal of the transmitted information is obtained, and the communication is completed.
  • the present invention does not require an indispensable technical means in conventional communication such as chaotic synchronization, channel estimation, and complex equalization. Compared with other improved differential chaotic keying (DCSK) schemes, the present invention does not require additional hardware consumption and more complicated algorithms, and effectively simplifies the system structure on the basis of ensuring the reliability of the communication system, and is easy to implement and implement. Integrated.
  • DCSK differential chaotic keying
  • the present invention uses a chaotic matched filter to filter out noise and multipath effects, and still operates normally at a low signal to noise ratio (SNR), improving the reliability of the communication system.
  • SNR signal to noise ratio
  • the present invention only needs to simply adjust the hybrid system parameter f to change the fundamental frequency of the signal so that the transmission signal adapts to the channel bandwidth.
  • the present invention has strong anti-narrowband interference capability, especially when the interference signal frequency is higher than the fundamental frequency of the transmission signal.
  • Figure 1 is a block diagram showing the structure of the method of the present invention
  • Figure 2 is a digital signal to be transmitted in the method of the present invention
  • Figure 3 is a chaotic signal generated by the method of the present invention in a hybrid system
  • Figure 4 is a transmission signal modulated by the method of the present invention.
  • Figure 5 is a signal received by a receiver after passing through a channel by the method of the present invention
  • Figure 6 is an output signal of a chaotic matched filter of the method of the present invention.
  • Figure 7 is the correlation result of the first symbol
  • Figure 8 is a correlation result of the second symbol
  • Figure 9 is a bit error rate performance under a Gaussian channel
  • Figure 10 is a representation of the bit error rate under a hydroacoustic channel
  • Figure 11 shows the bit error rate performance under different amplitude interference signals
  • Figure 12 shows the bit error rate performance under different frequency interference signals.
  • a binary symbol period is equally divided into two time periods, wherein each time period is equal to one-half of a symbol period, and is transmitted during the first time period.
  • the transmitted signal u 3 [u 1 , u 2 ], ie, transmits u 1 in the first time period, in the second time period Transmit u 2 ; when the transmitted modulated signal u 3 passes through the channel, the received signal v obtained at the receiving end, the received signal v is sent to the chaotic matched filter for filtering, and the output signal of the filter is obtained, and the output signal is obtained.
  • the portion (i-1) T b ⁇ t 1 ⁇ iT b corresponding to the i-th binary information in ⁇ is divided into the signal ⁇ 1i in the first period and the signal in the second period according to the symbol period.
  • ⁇ 2i performs convolution and decision process, in which the decision threshold is set to zero, send a message to get through the recovery process after To the final recovery signal.
  • a method according to an embodiment of the invention may include the following steps:
  • Step 1 Set communication system parameters
  • the spread spectrum signal base frequency f 8 Hz
  • the symbol period T b 1 s
  • the spread spectrum gain L 8.
  • Step 2 Prepare binary information to be sent.
  • Step 3 Generate a chaotic signal u 1
  • the chaotic signal u 1 is generated using the following hybrid system model:
  • Step 4. Prepare to transmit signals
  • u 1 (t), (i-1) is transmitted in the first half of the symbol period (i-1) T b ⁇ t 1 ⁇ (i-1)T b + T b /2 T b /2 ⁇ t ⁇ iT b /2 as a reference signal; in the second half of the symbol period (i-1) T b + T b /2 ⁇ t 1 ⁇ iT b is transmitted in the first half of the symbol period
  • the signal is multiplied by the signal to be transmitted (+1 or -1), where t 1 is the transmission variable time coordinate, and the final modulated transmission signal u 3 is obtained after processing each symbol;
  • the signal to be transmitted of the second symbol is obtained, as shown in FIG.
  • Step 5 performing chaotic matching filtering on the received signal
  • the receiving signal v obtained at the receiving end is received by the receiving end, and then the receiving signal v is sent to the chaotic matching filter for chaotic matching filtering, as shown in the following formula:
  • the transmitted signal u 3 is affected by various factors in the channel (environmental noise, multipath transmission, Doppler shift, etc.), and the signal received at the receiving end has undergone great distortion and attenuation.
  • Figure 5 shows the results of a hydroacoustic channel model with a transmitted signal passing through a signal-to-noise ratio of -10 dB, where the dashed line is the transmitted signal and the solid line is the received signal v amplified 40 times.
  • the received signal v is sent to the chaotic matched filter of equation (3), and the processed filtered signal is as shown in FIG. 6. It can be seen that the noise of the filtered signal is significantly impaired.
  • Step 6 Determine the polarity of the symbol
  • the portion (i-1) T b ⁇ t 1 ⁇ iT b corresponding to the i-th binary information in the output signal ⁇ of the chaotic matched filter is divided into two half-symbol periods according to the symbol period (ie, divided into two Paragraph), respectively:
  • the symbol polarity can be determined.
  • the criterion for determining the polarity of the symbol is:
  • the present invention Compared with the traditional differential chaos keying method (referred to as DCSK), the present invention has good anti-environment noise capability due to the use of a chaotic matched filter at the receiving end.
  • the inherent characteristics of underwater acoustic channels require transmission signals to withstand more severe multipath interference, environmental noise, amplitude attenuation, time-varying characteristics and other interference factors.
  • the method of the present invention can be seen as shown in FIG. 10. In the poor underwater acoustic channel, even if the signal to noise ratio is relatively large, the DCSK method cannot obtain a good error rate performance, and the method of the present invention can ensure The reliability of information transmission.
  • Chaotic signals have broadband characteristics and are highly resistant to narrowband interference.
  • the frequency of the interference signal (here selected as a sinusoidal signal) is equal to the fundamental frequency of the chaotic spread spectrum signal of 50 kHz, the amplitude of the different interference signals and the BER of different signal-to-noise ratios are as shown in Fig. 11, along with the amplitude of the interference signal. As the value A sin increases, the bit error rate also increases.
  • the frequency F changes
  • the BER curve with different SNR is obtained as shown in Fig. 12. It can be seen from Fig. 12 that when the interference signal frequency F is smaller than the fundamental frequency of the transmitted chaotic signal, the smaller the interference frequency is, the higher the error rate is.
  • the interference signal frequency F is greater than the fundamental frequency of the chaotic signal, the error rate is basically maintained. constant.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

L'invention concerne un procédé de communication à modulation par déplacement de chaos différentielle basé sur un système hybride, comprenant les étapes suivantes : étape 1, régler des paramètres de système de communication; étape 2, préparer des informations binaires à envoyer : prérégler des informations binaires; S3, générer un signal chaotique u1; étape 4, préparer un signal à émettre u3; étape 5, réaliser un filtrage apparié chaotique sur un signal reçu; et étape 6, déterminer la polarité d'un élément de code : réaliser respectivement des opérations associées sur deux segments de signaux, pour obtenir un signal récupéré par décodage. Le procédé de la présente invention simplifie efficacement une structure de système sur la base d'une garantie de la fiabilité d'un système de communication, et est facile pour une mise en œuvre et une intégration d'un micro-processeur; le procédé permet un fonctionnement normal à un faible rapport signal sur bruit, améliorant ainsi la fiabilité du système de communication; et le procédé permet à un signal émis de s'adapter à une bande passante de canal, et a une forte résistance à un brouillage à bande étroite.
PCT/CN2016/075967 2015-12-23 2016-03-09 Procédé de communication à modulation par déplacement de chaos différentielle basé sur un système hybride WO2017107316A1 (fr)

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CA2995500A CA2995500C (fr) 2015-12-23 2016-03-09 Procede de communication a modulation par deplacement de chaos differentielle base sur un systeme hybride

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WO2019153591A1 (fr) * 2018-02-08 2019-08-15 西安理工大学 Procédé de communication à modulation différentielle par déplacement de chaos à division de phase, basé sur un système hybride

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CN105515683B (zh) * 2015-12-23 2017-11-28 西安理工大学 基于混杂系统的差分混沌键控通信方法
CN106209712B (zh) * 2016-06-22 2019-04-16 厦门大学 基于码下标调制的差分混沌移位键控调制解调装置
CN107343002A (zh) * 2017-07-05 2017-11-10 四川铭扬通信科技有限公司 一种数据传输单元和远程终端的交互方法及系统
CN107493161B (zh) * 2017-07-21 2020-05-05 长安大学 一种多径条件下提取混沌信号的方法
WO2020113462A1 (fr) * 2018-12-05 2020-06-11 北京控制与电子技术研究所 Procédé de communication acoustique sous-marine à spectre étalé multiporteuse 5g basé sur une séquence chaotique
CN110278041B (zh) * 2019-06-17 2020-11-10 广东工业大学 差分混沌键控调制解调方法、装置、系统及可读存储介质
CN110365365B (zh) * 2019-07-19 2021-04-06 西安理工大学 一种基于混沌成型滤波的多进制差分混沌键控方法
CN112565132B (zh) * 2020-12-09 2022-07-01 西安工业大学 基于混沌成型滤波和相互校验的差分混沌键控方法

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CA2995500C (fr) 2020-12-01
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CA2995500A1 (fr) 2017-06-29

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