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Antenna subset direction modulation method

An antenna subset, directional modulation technology, applied in electrical components, multi-carrier systems, interference to communications and other directions, can solve problems such as relative phase relationship distortion, inability to demodulate communication information, etc., to achieve strong security and reduce computational complexity degree, the effect of ensuring safety

Active Publication Date: 2019-01-01
UNIV OF ELECTRONICS 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 signal, and legitimate users can normally demodulate the received signal; The relative phase relationship between the constellation points of the received signal of the machine is distorted, and the eavesdropper cannot demodulate the communication information from the received signal

Method used

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  • Antenna subset direction modulation method
  • Antenna subset direction modulation method
  • Antenna subset direction modulation method

Examples

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing and embodiment, describe technical solution of the present invention in detail:

[0034] Taking the 16QAM modulation constellation diagram as an example, this example includes the following steps:

[0035] S1: The constellation point that generates the 16QAM signal, the xth constellation point is expressed as

[0036] S2: Form a transmission signal at the antenna end, the specific steps are as follows:

[0037] S21. Set the initial phase at the antenna end to compensate the phase shift of different antennas arriving in the desired direction, and the expression form is as follows:

[0038]

[0039] Assuming that the number of antenna arrays is N=100, the desired direction θ T =60°, the array element spacing is λ / 2, and the reference coordinate origin is the array element center;

[0040] S22. In a uniform array with N antennas, randomly select 100 sets of antenna subsets, where each set of antenna subsets includes M=...

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Abstract

The invention, which belongs to the field of array signal processing in the communication technology, particularly relates to a novel antenna subset direction modulation method that is applied to transmission needing anti-eavesdrop communication. According to the invention, several groups of antenna subsets that have opposite phases and have constellation points with the highest deteriorating degrees in an unexpected direction are selected by using EVM, so that distortion of the constellation points in the unexpected direction can be maximized and thus the anti-eavesdrop effect is realized well. The novel antenna subset direction modulation method is characterized by selecting several groups of antenna subsets that have opposite phases and have constellation points with the maximum distortion in the unexpected direction by using the EVM.

Description

technical field [0001] The invention belongs to the field of array signal processing in the communication technology, and is used in transmission requiring anti-eavesdropping communication, specifically a novel antenna subset direction modulation method. 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 eaves...

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Application Information

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IPC IPC(8): H04L27/36H04K3/00
CPCH04K3/82H04L27/36
Inventor 程龙熊心宇岳光荣
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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