Direction modulation method for realizing random disturbance by utilizing unit antenna

A technology of directional modulation and random disturbance, applied in diversity/multi-antenna systems, electrical components, phase-modulated carrier systems, etc., can solve problems such as signal random disturbance, improve reliability and increase the difficulty of stealing information

Inactive Publication Date: 2014-04-02
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Technical problem: In view of the deficiencies of the existing directional modulation technology, the present invention proposes a method of randomly perturbing signals mod

Method used

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  • Direction modulation method for realizing random disturbance by utilizing unit antenna
  • Direction modulation method for realizing random disturbance by utilizing unit antenna
  • Direction modulation method for realizing random disturbance by utilizing unit antenna

Examples

Experimental program
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Embodiment 1

[0032] Such as figure 2 The shown method of the present invention is used for the system model of linear array, assumes that linear array is evenly distributed, and the distance between adjacent array elements is d=λ / 2, and the number of array elements is N=4, and the weighting factor of array elements is w =[w 1 ,w 2 ,w 3 ,w 4 ] T , the desired direction is at θ desired =40°, synthesize the QPSK baseband modulation signal in the desired direction. The set of information sequence values ​​is {0,1,2,3}, which are mapped to Each symbol sent is followed by figure 1 The flow shown performs direction modulation. e.g. information sequence s n ={2,1,3,3,1,0,…}, then for the first symbol 2 to be sent, the specific steps are:

[0033] 1) The mapping of symbol 2 in the desired direction is Randomly select one antenna from the 4 antennas as the undetermined antenna element, denoted as j (j=1,2,3,4), assuming that the fourth antenna is selected as the undetermined antenna el...

Embodiment 2

[0039] Such as Figure 5 Shown the present invention is used for the system model of circular array, suppose array element number be N=6, the spacing between adjacent array elements is all d=λ / 2, can obtain the radius of circular array by geometric relation The angle between the nth array element and the x-axis is The weighting coefficient of array element is w=[w 1 ,w 2 ,w 3 ,w 4 ,w 5 ,w 6 ] T , the desired direction is at θ desird =90°, the receivers are all on the xoy plane, so only the azimuth angle needs to be considered Impact. The QPSK baseband modulation signal is synthesized in the desired direction. information sequences n The set of values ​​is {0,1,2,3}, which are mapped to Each symbol sent is followed by figure 1 The flow shown performs direction modulation. e.g. information sequence s n ={3,1,0,3,1,2,…}, then for the first symbol 3 to be sent, the specific steps are:

[0040] 1) The mapping of symbol 3 in the desired direction is Randomly ...

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PUM

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Abstract

The invention discloses a direction modulation method for realizing random disturbance by utilizing a unit antenna. The method comprises the step of causing distortion of constellation points in an unexpected direction to randomly vary without the noise through randomizing the emission weighting coefficients of the unit antenna. Compared with the method of modulating a signal generating fixed distortion in the unexpected direction in a phased array direction, the method disclosed by the invention has the advantages that the difficulty in stealing information through tapping a receiver is increased, and the communication reliability is improved. In an expected direction, the method ensures the nondistortion of the modulated signal, so that the expected receiver can correctly receive demodulation information. The direction modulation method is independent of the variety of antenna arrays, and can be widely applied to various antenna arrays, such as a linear array, a circular array and a rectangular array.

Description

technical field [0001] The invention belongs to the physical layer security technology in the field of wireless communication, in particular, through the perturbation of unit antennas in the antenna array, an encryption technology more secure than common direction modulation technology is achieved. Background technique [0002] With the rapid development and wide application of wireless communication technology, the encryption and protection of communication information has become very important. Traditional wireless communication encryption uses encryption protocols above the physical layer (such as IPSec used at the network layer), but in some more complex network environments, such as ad-hoc networks, due to the lack of a secure channel to implement public key The exchange reduces the security of the upper encryption technology. Therefore, a new physical layer security technology is needed to improve the security of the wireless communication system. [0003] The tradit...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04L29/06H04L27/20
Inventor 王炎陈卓尤肖虎
Owner SOUTHEAST UNIV
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