An optical dft-s-ofdm secure transmission system based on digital chaos

Abstract

The invention discloses a light DFT-S-OFDM secure transmission system based on a digital chaos. The system comprises three encryption steps all together, i.e., insertion of an OFDM synchronous training sequence, DFT matrix signal preprocessing and subcarrier mapping, wherein an OFDM synchronous training sequence and a subcarrier mapping mode are both generated by a chaotic system, DFT matrix element parameters m and n are generated by the chaotic system, by use of initial value sensitivity and pseudo randomness of the digital chaos, encryption processing is performed on DFT-S-OFDM signals, and thus secret transmission is realized. On one hand, since a security system secret key space is huge, the security of high-speed information transmission can be effectively enhanced, and at the same time, since a DFT matrix can substantially reduce a peak average power ratio (PAPR) of OFDM signals, the performance of the transmission system is also improved; and on the other hand, since multiple iteration optimization and multiple discrete Fourier transformation operation are unnecessary in a DFT matrix signal processing system, the whole system has the following advantages: the system architecture is simple, the calculation amount is small, the transceiver cost is low, and transmission of sideband information is unnecessary.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a digital chaos-based optical discrete Fourier transform extended orthogonal frequency division multiplexing secure transmission system. Background technique [0002] With the rapid development of information and communication technology, people rely more and more on the Internet. With the continuous and rapid development of the Internet, Internet TV, 3D video, disaster recovery backup, cloud computing and other large-traffic and multi-demand broadband services emerge in an endless stream. Bandwidth demand is growing explosively, and presents an order of magnitude increase every three years. Therefore, in order to further meet the requirements of high-bandwidth business development, optical communication technology has been developed rapidly, and most of the information is currently transmitted through optical fibers. Incidents of eavesdropping on optical signals o...

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Problems solved by technology

[0013] Therefore, those skilled in the art are committed to developing an optical DFT-S-OFDM secure transmission system based on digital chaos, which solves the problem of complex encryption process, large amount of calculation, high hardware cost, small key space, and sideband information. and other shortcomings

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