Improved Logistic-Map chaos spreading sequence generation device and method based on weighting

Abstract

The invention provides an improved Logistic-Map chaos spreading sequence generation device and method based on weighting. Two initial values a and b are randomly selected within an initial value range; the two initial values are input to an improved Logistic-Map device respectively to generate two different actual value chaos sequences {X1} and {X2}; two weighting coefficients c and d are selected, wherein the c plus the d equals 1; the two actual value chaos sequences {X1} and {X2} are multiplied by the weighting coefficients respectively through a multiplier to obtain two weighted chaos sequences {X1'} and {X2'}; the weighted chaos sequences {X1'} and {X2'} are added together for a sum through an adder to obtain a new actual value chaos sequence {XSigma}; the obtained new actual value chaos sequence {XSigma} is subjected to two-value quantization and judgment according to a threshold value through a two-value quantizer so as to obtain a normal binary chaos spreading sequence {C} composed of '-1' and '1'. The chaos spreading sequence generated through the improved Logistic-Map chaos spreading sequence generation device and method based on weighting is good in confidentiality, and a system initial value cannot be easily estimated through reverse backward induction.

Description

technical field [0001] The present invention relates to a device for generating a composite chaotic spread spectrum sequence, and the present invention also relates to a method for generating a composite chaotic spread spectrum sequence, especially a generation of an improved Logistic-Map chaotic spread spectrum sequence based on weighted processing Devices and implementation methods. Background technique [0002] In the traditional spread spectrum communication system, PN sequence (pseudo-random sequence) is usually used as the spread spectrum sequence. However, this spread spectrum sequence has a certain periodicity, so its number of codes is very limited, and its resistance to interception is also poor. "Chaotic Spread-Spectrum Communication using Discrete-Time Synchronization" published in "The Journal of China Universities of Posts and Telecommunications" proposes a method of using chaotic sequences as spread spectrum sequences, which shows that chaotic sequences have a...

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Problems solved by technology

[0002] In the traditional spread spectrum communication system, the PN sequence (pseudo-random sequence) is usually used as the spread spectrum sequence. However, this spread spectrum sequence has a certain periodicity, so its number of codes is very limited, and its resistance to interception is poor.

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