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Chaotic multi-decimal digital modulation method

A digital modulation and multi-system technology, applied in digital transmission systems, modulation carrier systems, electrical components, etc., can solve problems such as implementation difficulties, poor bit error rate performance, and chaotic synchronization of the transceiver system, and improve the information transmission rate. and spectrum utilization, improving anti-interception capability, and improving anti-noise performance

Inactive Publication Date: 2010-10-06
HARBIN ENG UNIV
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Problems solved by technology

First of all, compared with the conventional digital communication, the above chaotic digital communication has poor bit error rate performance under the same signal-to-noise ratio; in addition, the current digital communication based on chaos is mainly concentrated on binary, and the information transmission rate is low. Chaos-based multi-ary digital communication is seldom studied
Literature [2] proposed a chaotic multi-ary digital modulation method based on the Lorentz model, and literature [3] proposed a chaotic multi-ary digital modulation method based on Cai's circuit, but their common disadvantage is that they require chaotic Synchronization is more difficult to implement

Method used

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Embodiment

[0062] The specific parameters are as follows

[0063] (1) The sampling frequency of the system is 400MHz;

[0064] (2) m(t) is a quaternary information sequence, m(t)∈0, 1, 2, 3, and the rate is 2M;

[0065] (3) The initial value of the Hamiltonian model corresponding to the quaternary information 0, 1, 2, 3 (x n0 ,y n0 )(n∈0, 1, 2, 3) are (-0.5, -4.5), (3.5, -0.5), (-4.5, -0.5), (-0.5, 3.5), respectively;

[0066] (4) The number of iterations N of the chaotic model is set to 100, and the internal clock frequency is 200MHz, that is, the chaotic model iteratively forms two completely overlapping circular trajectories in each multi-ary information symbol period;

[0067] First, the initial value of the Hamiltonian model is obtained from the multi-ary information through the initial value mapping method. The specific steps are:

[0068] (1). Simplify the phase trajectory area: select the circular phase trajectory of the 1 / 4 division point of the horizontal axis of each recta...

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Abstract

The invention relates to the digital communication field, particularly to a chaotic multi-decimal digital modulation method based on hamilton chaotic oscillator phase track division, which comprises the following steps that: multi-decimal information is converted into the initial value of a hamilton model through a initial value mapping method; when the rising edge of the synchronous pulse of themulti-decimal information arrives, the hamilton model obtains the initial value provided by initial value mapping, iterative operation is carried out to obtain a modulated chaotic baseband signal; linear transformation is carried out to the chaotic baseband signal to obtain a chaotic signal after linear transformation; and the original multi-decimal information is recovered through a space area on a chaotic signal phase track after linear transformation. The method makes full use of the confidentiality property of the chaotic signal in communication, and improves the anti-interception capability of a communication signal, the information transmission rate and the spectrum utilization rate of a digital communication system and the anti-noise performance of the system.

Description

Technical field: [0001] The invention relates to the field of digital communication, and in particular relates to a chaotic multi-ary digital modulation method based on phase track division of Hamiltonian chaotic oscillators. technical background: [0002] Chaotic signals are widely used in secure communication, spread spectrum communication and multi-user communication due to their high complexity, unpredictability, wide spectrum characteristics and approximate orthogonality. [0003] At present, the digital communication based on chaos mainly focuses on chaotic keying CSK[1]. and many more. But these chaos-based digital communications have the following disadvantages. First of all, compared with the conventional digital communication, the above chaotic digital communication has poor bit error rate performance under the same signal-to-noise ratio; in addition, the current digital communication based on chaos is mainly concentrated on binary, and the information transmissi...

Claims

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Application Information

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IPC IPC(8): H04L27/00
Inventor 付永庆张芳张林李星渊
Owner HARBIN ENG UNIV
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