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Orthogonal multi-carrier M-element chaotic phase modulation spread spectrum underwater acoustic communication method

An orthogonal multi-carrier, underwater acoustic communication technology, applied in multi-carrier systems, multi-frequency code systems, modulated carrier systems and other directions, can solve problems such as information leakage, communication performance limitations, and limited spread spectrum communication efficiency improvement.

Active Publication Date: 2019-09-20
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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  • Orthogonal multi-carrier M-element chaotic phase modulation spread spectrum underwater acoustic communication method
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  • Orthogonal multi-carrier M-element chaotic phase modulation spread spectrum underwater acoustic communication method

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Embodiment Construction

[0057] The following is a description of an orthogonal multi-carrier M-ary Chaotic Phase Modulation Orthogonal Multi-carrier Spread Spectrum (M-ary CPM-OMCSS) underwater acoustic communication method provided by the present invention with reference to specific drawings and embodiments. Explain further.

[0058] The flow chart of the orthogonal multi-carrier M-ary chaotic phase modulation spread spectrum underwater acoustic communication method provided by the present invention, such as figure 1 As shown, the specific description is as follows:

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

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

[0061] Among them, when 3 / 4

[0062] Modulate the unbinary quantized y(m) on the complex exponent to generate the chaotic phase modulation spreading code c, c contains N chips, of whi...

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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-ary chaotic phase modulation spread spectrum underwater acoustic communication method. Background technique [0002] The underwater acoustic channel is a time-varying, space-changing and frequency-varying channel with limited bandwidth, complicated multi-path interference, and serious background noise. The complexity of the channel severely limits the communication performance of underwater acoustic communication. Spread-spectrum communication has good anti-noise and anti-multipath interference characteristics due to the spread-spectrum gain, and is widely used in the field of remote underwater acoustic communication. However, due to the limitation of the underwater acoustic channel bandwidth, the communication rate of spread spectrum communication is relatively low, which can only meet the transmission rate of tens of bits or ev...

Claims

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Application Information

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Patent Type & Authority Applications(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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