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A Noise Suppression Method for Improving the Reliability of Differential Chaos Keying Communication System

A differential chaotic keying and communication system technology, applied in the transmission system, digital transmission system, modulated carrier system, etc., can solve the problems of time slot occupation, bandwidth occupation, system information transmission efficiency decline, etc., and achieve the effect of suppressing noise

Active Publication Date: 2021-01-22
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, among the above two methods of improving system reliability, the former takes up extra time slots, while the latter takes up extra bandwidth, both of which lead to a decrease in system information transmission efficiency

Method used

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  • A Noise Suppression Method for Improving the Reliability of Differential Chaos Keying Communication System
  • A Noise Suppression Method for Improving the Reliability of Differential Chaos Keying Communication System
  • A Noise Suppression Method for Improving the Reliability of Differential Chaos Keying Communication System

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Embodiment 1

[0045] The present invention first makes a specific design on the "chaos signal generator" on the basis of Fig. 1(a). figure 2 A schematic diagram of the specific implementation process of the noise-suppressing chaotic signal generator designed in the present invention is given.

[0046] Among them, the chaotic sequence is generated by the chaotic iterator, which can be expressed as:

[0047]

[0048] In formula (1), F( ) represents the function of the chaotic iterator, x i k is the input value, representing the i-th chaotic value in the chaotic sequence used for modulation of the k-th bit, x i+1 kis the output value, representing the (i+1)th chaotic value in the chaotic sequence used for modulation of the kth bit. When the chaotic iterator continuously generates chaotic values, every M values ​​generated are stored in the cache, and the cache is full every time M values ​​are obtained. At this time, the cache will be cleared, and the M values ​​will be output as two pa...

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Abstract

The invention provides a noise suppression method for improving reliability of a differential chaotic shift-keying communication system. The method comprises the following steps: constructing a chaotic signal generator based on storage and feedback at a sending end of a differential chaotic shift-keying system, enabling a produced chaotic signal to possess same segments at the adjacent time slot,and then performing tracking combination of the chaotic signals of different time slots at a receiving end, and combining reference signals of multiple time slots to obtain the SNR maximization, thereby greatly suppressing the noise of the reference signal and effectively improving the bit error rate performance of the differential chaotic shift-keying communication system to a receiving node froma sending node. When the high-order modulation based on the Gilbert transform is performed on the differential chaotic shift-keying, the noise suppression method provided by the invention is still applicable and effective.

Description

technical field [0001] The present invention relates to the field of mobile communication, and more specifically, to a noise suppression method for improving the reliability of a differential chaos keying (Differential Chaos Shift Keying, DCSK) communication system. Background technique [0002] In existing chaotic communication systems, DCSK is considered to be an attractive scheme in chaotic spread spectrum communication systems due to its excellent anti-near and far performance and low complexity. Figure 1(a) shows the sending end of a typical DCSK system, where the pulse-shaped chaotic reference signal x is generated by the chaotic signal generator k (t), reference signal x k (t) and bipolar code b converted from information bits k After multiplication, the information-bearing signal b is formed k x k (t), the two signals are respectively composed of mutually orthogonal carrier-sin(2πf 0 t) and cos(2πf 0 t) After modulation, it is sent to the wireless channel. Fig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L27/227H04B1/7107H04B1/7115
CPCH04B1/7107H04B1/7115H04L27/001H04L27/2273
Inventor 饶伟炜张琳
Owner SUN YAT SEN UNIV