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An Optimization Method Based on Frequency Controlled Array Artificial Noise Directional Modulation

A technology of artificial noise and optimization method, applied in the direction of modulated carrier system, diversity/multi-antenna system, digital transmission system, etc., can solve the problem that the wiretapping receiver cannot be guaranteed wireless confidential communication, etc., and achieve lower signal-to-noise ratio and better interception The effect of probabilistic performance

Active Publication Date: 2021-06-11
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

At present, the directional modulation of the frequency control array mainly focuses on the research of decoupling methods and the optimization of the beam vector, which cannot guarantee the wireless secure communication when the eavesdropping receiver is close to the legitimate receiver.

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  • An Optimization Method Based on Frequency Controlled Array Artificial Noise Directional Modulation
  • An Optimization Method Based on Frequency Controlled Array Artificial Noise Directional Modulation
  • An Optimization Method Based on Frequency Controlled Array Artificial Noise Directional Modulation

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0019] The wireless security communication based on frequency control array artificial noise direction modulation provided by the present invention,

[0020] 1) Assuming that the transmitter is a uniform linear array composed of N array elements, its array factor is expressed as in, Denote the beam vector and steering vector of the nth array element, respectively. Δf n is the frequency compensation of the nth array element. θ and r are the azimuth and distance of the receiver respectively, h(f, θ, r, t) = [h 0 , h 1 ,...,h N-1 ] is the guiding vector.

[0021] 2) The artificial noise baseband signal based on the frequency control array is expressed as Among them, P s is the transmission power, α is the power allocation factor, x(t) is the symbol message, P AN (...

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Abstract

The present invention provides an optimization method based on frequency control array artificial noise direction modulation. The azimuth and distance of the legal receiver are known at the transmitting end, and the normalized beam vector is taken; the maximum confidentiality of the maximum legal receiver and the approaching wiretapping receiver is calculated. According to the difference in speed, through the non-convex optimization algorithm, the frequency compensation vector with the maximum secrecy ability is solved, and then the legal receiver steering vector is obtained; according to the orthogonality between the artificial noise and the legal receiver steering vector, the normalized artificial noise projection matrix is ​​calculated, The artificial noise baseband signal based on the frequency control array is obtained. The invention realizes dual control on angle and distance, simultaneously realizes the maximum secrecy rate difference between the legal receiver and the near-eavesdropping receiver, and ensures higher-precision physical layer wireless security communication.

Description

technical field [0001] The invention relates to a direction modulation method of a multi-antenna array, which is suitable for wireless safety communication by using a frequency control array combined with artificial noise. Background technique [0002] In traditional wireless communication, the baseband signal is up-converted to radio frequency, which is excited by the amplifier to the transmitting antenna to realize digital wireless communication. However, due to the openness of the wireless communication transceiver system and the wireless transmission channel, if the eavesdropping receiver has sufficient sensitivity, it can also demodulate the confidential information, so the privacy and security of the communication information during transmission cannot be guaranteed. . In order to realize wireless secure communication, it is necessary to reduce the signal-to-noise ratio of the eavesdropping receiver and enhance its low probability of intercept (LPI) capability under t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456H04B7/08H04L27/38
CPCH04B7/0456H04B7/0857H04B7/086H04L27/3863
Inventor 王伶邱彬谢坚粟嘉陶明亮张兆林
Owner NORTHWESTERN POLYTECHNICAL UNIV
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