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Method for refactoring sequence in direct sequence spread spectrum (DSSS) technology

A direct-sequence spread spectrum and sequence technology, applied in encryption devices with shift registers/memory, electrical components, transmission systems, etc., can solve the problems of eavesdroppers deciphering spread spectrum sequences and low confidentiality, and improve stealth performance , Good confidentiality transmission effect

Inactive Publication Date: 2015-04-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0008] The present invention proposes a sequence reconstruction method in the direct sequence spread spectrum technology, which is used to solve the problem of low confidentiality and easy for eavesdroppers to decipher the spread spectrum sequence existing in the existing single spread spectrum system

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  • Method for refactoring sequence in direct sequence spread spectrum (DSSS) technology
  • Method for refactoring sequence in direct sequence spread spectrum (DSSS) technology

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Embodiment Construction

[0025] The technical solution of the present invention will be described in detail below in combination with the embodiments and the accompanying drawings.

[0026] Direct-sequence spread-spectrum communication, that is, direct-spread communication, uses a higher-frequency pseudo-random code to extend the baseband signal to a wider frequency band through spread-spectrum modulation, so that the energy of the transmitted signal is extended to a wider bandwidth. So it looks like noise, making the system more hidden. The receiving end uses the same pseudo-random code to despread, thereby recovering the original information data. This system has a series of advantages such as low signal transmission power, strong anti-interference ability, anti-multipath, strong multi-access ability, anti-tracking interference and suppression of near-far effect.

[0027] The spread spectrum process is to multiply the transmission signal by a high-rate pseudo code, the spectrum width of the signal ...

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Abstract

The invention belongs to the field of wireless communications and particularly relates to a method for refactoring a sequence after spectrum spreading in a direct sequence spread spectrum (DSSS) communication system. The method for refactoring the sequence in a DSSS technology is used for solving the problems that in an existing single-time spread spectrum system, a spread spectrum sequence is easily decoded by a wiretapper, and confidentiality is low. The method mainly comprises the steps that the original sequence of signals after spectrum spreading is disrupted, and data are refactored according to a certain mode. Accordingly, the signals do not have signal periodicity and correlated characteristics before refactoring, and the transmitted signals have higher confidential performance. The method can be used for the DSSS technology and can be performed in a time domain, a frequency domain and a space domain or on different media. Compared with a traditional spread spectrum modulation method, the method can improve the confidential characteristic of the system and prevent information leakage.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a method for reconstructing a spread spectrum sequence in a Direct Sequence Spread Spectrum (DSSS) system. Background technique [0002] Direct-sequence spread-spectrum communication, that is, direct-spread communication, uses a higher-frequency pseudo-random code to extend the baseband signal to a wider frequency band through spread-spectrum modulation, so that the energy of the transmitted signal is extended to a wider bandwidth. So it looks like noise, making the system more hidden. The receiving end uses the same pseudo-random code for despreading, thereby recovering the original information data. [0003] The spread spectrum process is to multiply the transmission signal by a high-rate pseudo code, the spectrum width of the signal to be transmitted is greatly broadened, and the power spectral density is greatly reduced. When despreading at the receiving en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B1/711H04L9/06
Inventor 何旭朱青云
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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