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An Orthogonal Multi-Carrier m-element Chaotic Phase Modulation Spread Spectrum Underwater Acoustic Communication Method

An orthogonal multi-carrier and underwater acoustic communication technology, applied in multi-carrier systems, multi-frequency code systems, phase-modulated carrier systems, etc., can solve problems such as lack of confidentiality, information leakage, and communication performance limitations

Active Publication Date: 2020-12-01
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the above time-domain spread spectrum scheme has limited improvement in the efficiency of spread spectrum communication, and the communication performance is limited under underwater acoustic conditions with complex channel structures.
In addition, the pseudo-random (Pseudo-Noise, PN) sequence used in the traditional spread spectrum modulation has obvious periodicity and binary characteristics. Once the signal is intercepted, the corresponding characteristics such as chip rate and code period are easy to be extracted by the enemy. and use, leading to information leakage, not confidential

Method used

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  • An Orthogonal Multi-Carrier m-element Chaotic Phase Modulation Spread Spectrum Underwater Acoustic Communication Method
  • An Orthogonal Multi-Carrier m-element Chaotic Phase Modulation Spread Spectrum Underwater Acoustic Communication Method
  • An Orthogonal Multi-Carrier m-element Chaotic Phase Modulation Spread Spectrum Underwater Acoustic Communication Method

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Embodiment Construction

[0057] A kind of orthogonal multi-carrier M element chaotic phase modulation spread spectrum underwater acoustic communication method (M-ary Chaotic Phase Modulation Orthogonal Multi-carrier SpreadSpectrum, M-ary CPM-OMCSS) provided by the present invention is described below in conjunction with specific drawings and embodiments Further explanation.

[0058] Orthogonal multi-carrier M-element chaos phase modulation spread spectrum underwater acoustic communication method flow chart provided by the present invention, as figure 1 As shown, the specific description is as follows:

[0059] Step 1: Use Quadratic mapping to obtain the original chaotic code, and the mapping equation is expressed as:

[0060] y(m+1)=P-Qy 2 (m) (1)

[0061] Among them, when 3 / 4

[0062] Modulate the y(m) without binary quantization on the complex exponent to generate the chaotic...

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Abstract

The invention discloses an orthogonal multi-carrier M-element chaotic phase modulation spread spectrum underwater acoustic communication method. The method comprises the following steps of: 1) dividing an input information sequence sent by an information source into K groups of information sequences with the length of a + 2 by a transmitting end, respectively feeding the information sequences into K grouping devices; using each grouping device to carry out M-element chaotic phase modulation spread spectrum mapping on the previous a bits to obtain a chaotic phase modulation spread spectrum code, performing QPSK modulation on two rear bits, performing spread spectrum modulation by using the obtained chaotic phase modulation spread spectrum code to obtain baseband signals, and respectively mapping K groups of baseband signals to subcarriers of OFDM symbols to perform OFDM modulation to obtain a digital signal to be transmitted and transmitting the digital signal to be transmitted; and 2) enabling the receiving end to adopt a section of chaotic phase modulation spread spectrum signal in OFDM symbols as a pilot signal, performing time-frequency two-dimensional search on the received digital signal to complete time-frequency synchronization, then performing OFDM demodulation to obtain K groups of baseband signals, and inputing the K groups of baseband signals into K combiners to complete despreading and QPSK demodulation to obtain a binary sequence.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic communication, in particular to an orthogonal multi-carrier M-element chaotic phase-modulation spread-spectrum underwater acoustic communication method. Background technique [0002] The underwater acoustic channel is a time-varying, space-varying and frequency-varying channel with limited bandwidth, complex multi-path interference, and serious background noise. The complexity of the channel severely limits the communication performance of underwater acoustic communication. Due to the existence of spread spectrum gain, spread spectrum communication has good anti-noise and anti-multipath interference characteristics, and is widely used in the field of long-distance underwater acoustic communication. However, due to the limitation of the bandwidth of the underwater acoustic channel, the communication rate of spread spectrum communication is low, and often can only meet the transmission r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L27/20H04L27/22H04L27/26H04L27/32H04B1/707
CPCH04B1/707H04L27/001H04L27/20H04L27/22H04L27/2628H04L27/265H04L27/2656H04L27/2657H04L27/32
Inventor 普湛清黄海宁王巍李宇
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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