OOFDM (Optical Orthogonal Frequency Division Multiplexing) encryption system based on chaos sequence mapping

Abstract

The invention discloses an OOFDM (Optical Orthogonal Frequency Division Multiplexing) encryption system based on chaos sequence mapping; the OOFDM encryption system comprises a chaos sequence mapping based encrypting optical emission module, an optical fiber transmission module and a chaos sequence mapping based decrypting optical receiving module; the optical emission module, the optical fiber transmission module and the optical receiving module are successively connected; the chaos sequence mapping based encrypting optical emission module comprises a chaos encryption unit and an OFDM (Orthogonal Frequency Division Multiplexing) modulation unit, wherein the chaos encryption unit is connected with one end of the optical fiber transmission module via the OFDM modulation unit; the chaos sequence mapping based decrypting optical receiving module comprises a chaos decryption unit and an ODFM demodulation unit; and the other end of the optical fiber transmission module is connected with the chaos decryption unit via the ODFM demodulation unit. According to the OOFDM encryption system disclosed by the invention, by fully utilizing the characteristics of a chaos system to initial value sensitivity, the safety of the encryption is greatly improved; and while the orthogonality of OFDM modulation is kept relatively well, the damage to system performance due to encryption is reduced.

Description

technical field [0001] The invention relates to the technical field of optical communication encryption, in particular to an OOFDM encryption system based on chaotic sequence mapping. Background technique [0002] With the continuous development and maturity of communication technology, people have higher and higher requirements for communication speed. With the application of the fourth-generation mobile communication based on data communication and image communication, optical fiber communication has become the main way of mobile communication. Optical Orthogonal Frequency Division Multiplexing (OOFDM) technology, as an optical communication technology that can effectively resist signal waveform interference, has attracted widespread attention. At the same time, the data encryption for the OOFDM system has become a problem that has to be solved in the application of the OOFDM system. [0003] In recent years, chaotic encryption has received more and more attention. Due ...

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Problems solved by technology

However, this scheme uses a four-dimensional chaotic system to encrypt the phase factor of the QAM map. The use of a four-dimensional chaotic sequence increases the complexity of the system on the one hand, and on the other hand, the change of the phase factor of the QAM map will also destroy OFDM to a certain extent. The orthogonality of the signal, so to a certain extent, will cause the reduction of system performance, the increase of adjustment cost and the reduction of system efficiency

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