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Chaos spreading spectrum underwater acoustic communication method

An underwater acoustic communication and chaotic signal technology, applied in the field of communication, can solve the problems of complex system structure and high bit error rate, and achieve the effects of flexible channel bandwidth, simplified structure and flexible adaptation

Active Publication Date: 2015-07-01
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a chaotic spread-spectrum underwater acoustic communication method, which solves the problems of complex system structure and high bit error rate in the existing chaotic spread-spectrum communication method

Method used

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  • Chaos spreading spectrum underwater acoustic communication method
  • Chaos spreading spectrum underwater acoustic communication method
  • Chaos spreading spectrum underwater acoustic communication method

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Embodiment

[0074] Step 1. Binary information to be transmitted B n ={b 1 ,b 2 ,...,b n } Converted to each symbol b ii Duration is T b Square wave signal u 0 , Where b ii ={1,-1}, ii=1, 2,......,n,b ii Represents the iith binary information. This embodiment assumes that n=2 sends two bits of binary information, namely B 2 ={b 1 ,b 2 }, if B 2 Converted to each symbol duration T b = 0.5s square wave signal u 0 ,Such as Picture 10 Shown.

[0075] Step 2. Use the chaotic signal u generated by the hybrid system as a spreading sequence. The hybrid system consists of a continuous state and a discrete state. The expression is as follows:

[0076] u · · - 2 β u · + ( ω 2 + β 2 ) ( u - s ) = 0 , - - - ( 1 )

[0077] when u · ( t ) = 0 , s ( t ) = sgn ( u ( t ) ) ; when u · ( t ) ≠ 0 , s ( t ) constant. among them:

[0078] sgn ...

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Abstract

The invention discloses a chaos spreading spectrum underwater acoustic communication method. The chaos spreading spectrum underwater acoustic communication method includes that step 1, converting Bn into a square wave signal u0, wherein the lasting time of each code element of the square wave signal is Tb; step 2, using a chaos signal u generated by a hybrid system as a chaos spreading spectrum sequence; step 3, multiplying u0 of the step 1 by the u of the step 2 to obtain a spectrum spread signal u1; step 4, adding synchronization information to the signal u1 to obtain a finally emitted signal u2; step 5, using a matching filter at the receiving end, wherein the output signal of the matching filter is u4; step 6, detecting the output signal u4 at a special time, and judging the symbol; step 7, multiplying the judged symbol value corresponding to the synchronization information corresponding to each binary information by the judged symbol value of the corresponding spreading spectrum signal section to obtain the sent binary information. The chaos spreading spectrum underwater acoustic communication method is good in security and high in precision.

Description

Technical field [0001] The invention belongs to the field of communication technology and relates to a chaotic spread spectrum underwater acoustic communication method. Background technique [0002] The ocean occupies two thirds of the earth's surface area and contains abundant energy. As problems such as resource shortages and environmental pollution have become increasingly prominent, various countries have turned their attention to the oceans and realized the development and utilization of marine resources. Hydroacoustic communication is inseparable. With the establishment of various communication networks, spectrum resources have become more crowded, and the interference between communications has become more serious. Spread spectrum technology is a very important anti-interference communication technology. [0003] The chaotic signal has the characteristics of wide frequency spectrum, initial value sensitivity and pulse autocorrelation function, which provide superior conditi...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04B1/69
Inventor 任海鹏孔青菊白超
Owner XIAN UNIV OF TECH
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