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Chaotic spread spectrum secure communication system based on quadrature amplitude modulation

A quadrature amplitude modulation and secure communication technology, applied in the field of information security, can solve problems such as performance and bit error rate defects, and achieve the effects of fast transmission rate, strong anti-interception ability, and wide frequency band

Active Publication Date: 2021-08-20
深圳立专技术转移中心有限公司
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Problems solved by technology

However, this patented technical solution has defects in performance, bit error rate, etc.

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  • Chaotic spread spectrum secure communication system based on quadrature amplitude modulation
  • Chaotic spread spectrum secure communication system based on quadrature amplitude modulation
  • Chaotic spread spectrum secure communication system based on quadrature amplitude modulation

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[0025] In order to illustrate the embodiments of the present invention more clearly, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other accompanying drawings based on these drawings and obtain other implementations.

[0026] like figure 1 As shown, the embodiment of the present invention is based on the quadrature amplitude modulation chaotic spread spectrum security communication system, including a mirror 1, a first chaotic laser 2-1, a second chaotic laser 2-2, a third chaotic laser 2-3, and a first chaotic laser 2-3. One power divider 3-1, the second power divider 3-2, the first multiplier 4-1, the second multiplier 4-2, the third multiplier 4-3, the fourth multiplier 4-4, the first multiplier Five multipliers 4-5, sixth multipliers...

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Abstract

According to a chaotic spread spectrum safety communication system based on quadrature amplitude modulation, a reflector is connected with a chaotic laser, and the chaotic laser drives a second chaotic laser and a third chaotic laser to enter a synchronous state; a transmitting end converts the optical chaotic signal into an electric signal, the electric signal is divided into two paths to be multiplied by two multipliers respectively, the two paths are multiplied by signals cos (omega t) and sin (omega t) respectively by the two multipliers, the two signals are added, and after a continuous laser generates continuous light waves, the signals are modulated to the light waves generated by the continuous laser by a phase modulator; a receiving end utilizes a Mach-Zehnder interferometer to convert the light wave signal into intensity modulation, divides the light signal into two paths, respectively passes through a third photoelectric detector and a fourth photoelectric detector, and respectively multiplies the two paths of orthogonal sine and cosine signals by utilizing a fifth multiplier and a sixth multiplier to obtain two paths of encrypted chaotic sequences; and at the receiving end, the third chaotic laser generates a synchronous chaotic sequence, converts the synchronous chaotic sequence into an electric signal, divides the electric signal into two paths, and respectively performs cross-correlation operation with the received electric chaotic signal to recover transmission information.

Description

technical field [0001] The invention belongs to the technical field of information security, and in particular relates to a chaos spread spectrum security communication system based on quadrature amplitude modulation. Background technique [0002] Chinese Patent No. 2017100102390 discloses a laser chaotic spread spectrum conversion system with time delay hiding characteristics. The chaotic optical signal generated by the external cavity semiconductor laser is spread through the time lens composed of photoelectric phase modulators PM1, PM2 and high dispersion medium. Specifically, on the basis of time-frequency conversion by time-domain Fourier transform, the chaotic spectrum broadening is realized by increasing the amount of dispersion, and the relationship between the driving signal period and the feedback delay time of the chaotic laser is realized by adjusting the relationship between the driving signal period and the chaotic laser feedback delay time. The time-delay labe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/69H04B10/50H04B10/54H04B10/548H04L9/00H04L9/12
CPCH04B10/503H04B10/548H04B10/54H04L9/001H04L9/12H04B1/69
Inventor 李齐良奚小虎林郎胡淼唐向宏曾然
Owner 深圳立专技术转移中心有限公司
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