Beamforming-based dynamic direction modulation method

A technology of directional modulation and beamforming, which is applied in the field of dynamic directional modulation based on beamforming, can solve problems such as relative phase relationship distortion and inability to demodulate communication information, and achieve strong security, reduce computational complexity, and ensure security Effect

Active Publication Date: 2017-06-23
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

The direction modulation signal has strong directionality. The relative phase relationship between the transmitted wireless communication signal and the constellation point of the received signal at the desired azimuth is the same as that of the baseband digital modulation signa

Method used

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  • Beamforming-based dynamic direction modulation method
  • Beamforming-based dynamic direction modulation method
  • Beamforming-based dynamic direction modulation method

Examples

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[0035] Example:

[0036] Taking the 16APSK modulation constellation diagram as an example, this example includes the following steps:

[0037] S1: Establish an antenna far-field model different from traditional beamforming:

[0038]

[0039] Assume that the number of antenna arrays is N=16, and the array element spacing is λ / 2;

[0040] It can be seen from the formula that the far-field radiation vectors are consistent in different modulation symbols, and the safety of the radiation electric field can be effectively enhanced by introducing a new degree of freedom in different modulation symbols.

[0041] In directional modulation (DM), G mn with D m The changes are constantly updated, and the as a new complex gain G mn ' to control the beamforming network while replacing the baseband D m Modulation can also be regarded as a new antenna weight;

[0042] S2: Divide the 16APSK modulation constellation diagram into outer circle amplitude 1, inner circle amplitude 0.5540...

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Abstract

The present invention belongs to the array signal processing field in communication technologies and relates to a beamforming-based dynamic direction modulation method. According to the beamforming-based dynamic direction modulation method, one-time integration is performed on an antenna through an algorithm, so that a group of antenna weights is obtained; antenna weights are not required to be re-calculated in different symbol periods, and it only needs to randomly change the sequence of the antenna weight data, and a group of antenna weights is selected from the antenna weight data so as to be subjected to integration, and therefore, low-complexity dynamic direction modulation is realized; and a direction modulation method is adopted to update array element weights so as to replace base band modulation. With the algorithm provided by the invention adopted, the security of dynamic direction modulation can be realized under a low-complexity condition.

Description

technical field [0001] The invention belongs to the field of array signal processing in communication technology, and in particular relates to a dynamic direction modulation method based on beamforming. Background technique [0002] The development and application of wireless communication technology has brought great convenience to life. Since wireless communication is an open system, while it brings convenience, security is also a problem worth considering and solving. With the improvement of information security requirements and the continuous development of eavesdropping technology, traditional security methods are increasingly challenged, and traditional security technologies need to be enhanced urgently. The research direction of physical layer security technology involves how to realize the safe transmission of wireless communication information to the receiver at the physical layer under the condition that the eavesdropping receiver and the expected receiver have the...

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Application Information

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IPC IPC(8): H04B7/06H04L27/34
CPCH04B7/0617H04L27/3477
Inventor 曾丽群岳光荣程龙余代中
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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