Differential Chaotic Keying Communication Method Based on Hybrid System
A differential chaotic keying and hybrid system technology, applied in the field of spread spectrum communication, can solve the problems of multi-path interference, time-varying characteristics and environmental noise restriction of the reliability of underwater acoustic communication, affecting the popularization and utilization of underwater acoustic communication, etc. and integration, strong anti-narrowband interference ability, filtering effect of noise and multipath effects
Inactive Publication Date: 2017-11-28
XIAN UNIV OF TECH
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[0004] The purpose of the present invention is to provide a kind of differential chaos keying communication method based on hybrid system, solves the reliability of underwater acoustic communication in the prior art and is subjected to problems such as multipath interference, amplitude attenuation, time-varying characteristics and environment in the underwater channel Noise restrictions have seriously affected the promotion and utilization of underwater acoustic communications
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[0046] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0047] refer to figure 1 , the working principle of the method of the present invention is that a binary symbol period is equally divided into two time periods, wherein each time period is equal to 1 / 2 of a symbol period, and the hybrid system is sent in the first time period to generate The chaotic signal, as the reference signal u of the transmitted symbol 1 ; Send the reference signal u in the second time period 1 Multiplied by the binary symbol b to be sent i , the digital signal B n ={b 1 ,b 2 ,...,b n}, get u 2 ; transmit signal u 3 =[u 1 , u 2 ], that is, send u in the first time period 1 , send u in the second time period 2 ; When the modulated signal u sent 3 After passing through the channel, the received signal v obtained at the receiving end is sent to the chaotic matched filter for filtering, and the output signal ξ ...
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Disclosed is a differential chaos shift keying communication method based on a hybrid system, comprising the steps of: step 1, setting communication system parameters; step 2, preparing binary information to be sent: presetting binary information; S3, generating a chaotic signal u1; step 4, preparing a signal to be transmitted u3; step 5, performing chaotic matched filtering on a received signal; and step 6, determining the polarity of a code element: respectively performing related operations on two segments of signals, to obtain a recovered signal by decoding. The method of the present invention effectively simplifies a system structure on the basis of ensuring the reliability of a communication system, and is easy for implementation and integration of a microprocessor; the method enables normal operation at a low signal-to-noise ratio, thereby improving the reliability of the communication system; and the method enables a transmitted signal to adapt to a channel bandwidth, and has strong resistance to narrow-band interference.
Description
technical field [0001] The invention belongs to the technical field of spread spectrum communication, and relates to a differential chaos keying communication method based on a hybrid system. Background technique [0002] Underwater communication has a vital impact in the fields of ocean exploration, ocean monitoring, development, and national defense. The underwater communication network provides different users with the information transmission and communication required for detection, remote control, and security assurance, and can also serve for marine environmental pollution. And geological disaster forecasting, to achieve large-scale unmanned monitoring; in addition, the use of underwater communications in the military field can establish an anti-reconnaissance and early warning network system. However, the propagation of light waves and electromagnetic waves in sea water is greatly attenuated, which cannot be used for information transmission over medium distances, an...
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IPC IPC(8): H04B13/02H04B1/7097
CPCH04B1/7097H04B13/02H04B1/69
Inventor 任海鹏白超杨勇
Owner XIAN UNIV OF TECH