Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF2 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 modulated in an undesired direction by randomizing unit antenna transmission weighting coefficients, while ensuring that the signal modulated in the desired direction is not distorted

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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
Comparison scheme
Effect test

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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04B7/06H04L29/06H04L27/20
Inventor 王炎陈卓尤肖虎
Owner SOUTHEAST UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com