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Optimization method for artificial noise direction modulation based on frequency control array

A technology of artificial noise and optimization method, applied in modulation carrier system, space transmit diversity, transmission system and other directions, can solve the problem of inability to guarantee wireless secure communication of eavesdropping receiver, and achieve the performance of reducing signal-to-noise ratio and good low probability of interception. Effect

Active Publication Date: 2019-01-18
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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  • Optimization method for artificial noise direction modulation based on frequency control array
  • Optimization method for artificial noise direction modulation based on frequency control array
  • Optimization method for artificial noise direction modulation based on frequency control array

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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 invention provides an optimization method for artificial noise direction modulation based on a frequency control array. The method comprises the steps: enabling a transmitting end to obtain the azimuth and distance of a legal receiver, and extracting a normalized beam vector; calculating the maximum confidential rate difference between a maximum legal receiver and an adjacent eavesdropping receiver; calculating a frequency compensation vector with the maximum confidential capability through a non-convex optimization algorithm, and then calculating a legal receiver guide vector; calculatinga normalized artificial noise projection matrix according to the orthogonality of the artificial noise and the legal receiver guide vector, and obtaining an artificial noise baseband signal based onthe frequency control array. The method realizes the dual control of angle and distance, and realizes the maximum confidential rate difference between the legal receiver and the adjacent eavesdroppingreceiver, 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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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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