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Method and device for constructing spreading code

A spreading code and construction technology, applied in the field of constructing spreading codes, can solve the problems of low sequence linear complexity, reducing the confidentiality of spread spectrum communication systems, etc., and achieve high possibility, good autocorrelation characteristics and cross-correlation characteristics, The effect of improving confidentiality

Active Publication Date: 2009-12-09
SOI MICRO CO LTD
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Problems solved by technology

Although these spread-spectrum sequences have quite good correlation properties, the linear complexity of these sequences is too low, so they can be reconstructed by a linear recursive method, which greatly reduces the secrecy of spread-spectrum communication systems

Method used

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  • Method and device for constructing spreading code
  • Method and device for constructing spreading code
  • Method and device for constructing spreading code

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Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] Such as figure 1 As shown, the method for constructing a spread spectrum code in a spread spectrum communication system using a chaotic map provided by an embodiment of the present invention may include:

[0035] Step S1, using the chaotic map and the initial conditions, after binary quantization, a binary quantized chaotic sequence with values ​​of +1 and -1 (ie, a pseudo-random chaotic sequence) is obtained. Among them, the initial condition can be the initial input value at a certain moment. This step S1 will combine figure 2 Be specific.

[0036] Step S2, according to the initial start time M and the end time M+N-1 determined according to the spread spectrum code length (assuming that the spread spectrum code length is 2...

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Abstract

The invention discloses a method for constructing a spreading code, comprising the following steps: using chaotic map and initial condition, obtaining a two-valued quantification chaotic sequence after the two-valued quantification; carrying out intercepting treatment on the two-valued quantification chaotic sequence according to the initial start time and finish time determined by spreading codelength to obtain an intercepted chaotic sequence; carrying out ascending velocity treatment on the intercepted chaotic sequence to improve the velocity thereof; treating the intercepted chaotic sequence to obtain an improved chaotic sequence; carrying out displacement and combination on the intercepted chaotic sequence with improved velocity and the improved chaotic sequence, thus obtaining the self-balancing spreading code. The invention further discloses a device for constructing the spreading code. The invention not only improves the confidentiality of spread spectrum communication but also has good self-correlation characteristic and cross-correlation characteristic of the constructed spreading code.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and device for constructing a spread spectrum code. Background technique [0002] The anti-jamming, anti-multipath, anti-interception, secrecy, multiple access communication, and synchronization in the spread spectrum communication system are closely related to the characteristics of the adopted direct sequence spread code. In order to meet the various requirements of the spread spectrum system for the length of the direct sequence spreading code, the pseudo-random sequence used as the direct spreading code should have a longer period; in order to effectively reduce the carrier leakage of the system, the pseudo-random sequence should have a good Balance; in order to reduce multipath interference and self-interference, the pseudo-random sequence should have sharp autocorrelation characteristics; in order to reduce the multiple access interference of the system, the pseudo-random...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/69H04B1/707H04B1/7115H04J13/10
Inventor 安勇牟荣增阎跃鹏
Owner SOI MICRO CO LTD
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