Four-dimensional antenna array based secret communication system and method thereof

A technology of secure communication and antenna array, applied in secure communication, diversity/multi-antenna system, space transmit diversity, etc., can solve the problems of limited capability of secure communication, two groups of antenna waveforms cannot be completely consistent, etc., to simplify the transmitter The effect of the system

Active Publication Date: 2014-12-31
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, due to the mutual coupling between the arrays, the waveforms of the two sets of antennas cannot be completely consistent, and according to the published results, the ability of this method to achieve secure communication is limited

Method used

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  • Four-dimensional antenna array based secret communication system and method thereof
  • Four-dimensional antenna array based secret communication system and method thereof
  • Four-dimensional antenna array based secret communication system and method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Using a four-dimensional antenna array to realize direction modulation and secure communication has the advantages of simple system structure, easy engineering implementation, and strong confidentiality ability. It is a novel secure communication method.

[0044] The invention moves the phase center of the antenna array by controlling the working time sequence of each antenna array, the modulation of the transmitted signal is completed at the antenna end, and the modulation of digital signals such as BPSK, QPSK and M spread spectrum sequences can be realized, and the signal waveform is related to the direction , so as to realize the direction modulation of the signal. The transmitted signal not only has different power levels in each direction, but also carries different information: in the direction of the desired receiver, the information to be transmitted is synthesized; in the other directions, the signal waveform is distorted and does not contain the information to ...

Embodiment 2

[0055] 20-antenna-element QPSK modulation based on SPDT switches.

[0056] To improve the basic scheme, it can be constituted as a reference Figure 5 The QPSK modulation system shown. In this embodiment, 20 omnidirectional antenna units are used to form a time-modulated antenna array. The transmitter system mainly includes an antenna array (1), a high-precision local oscillator (3), a power amplifier (4), a switch control circuit (5), a serial-to-parallel conversion unit (6), a phase shifter (7) and a single-pole Double throw switch (8), etc. The antenna elements of each channel are equally spaced at half wavelengths, and are labeled A to T. The 20 antenna units are divided into 4 sub-arrays, and each antenna sub-array is composed of 5 adjacent antenna units, and the antenna sub-array N is composed of antenna units 5(N-1)+1 to 5N (N∈{1,2, 3,4}). By adjusting the phase shifter 7 to make the main beam of each antenna sub-array point to the direction of θ=60°, the radiation...

Embodiment 3

[0060] M-sequence modulation of 10-way antenna elements based on single-pole double-throw switches.

[0061] In this embodiment, the directional modulation based on the four-dimensional antenna array is combined with the spread spectrum communication, and the spread spectrum sequence of M=7 is transmitted in the direction of θ=60°. Refer to the structure block diagram of the transmitter Figure 10 . The transmitter structure includes an antenna array (1), a high-precision local oscillator (3), a power amplifier (4), a switch control circuit (5), a phase shifter (7), a single-pole double-throw switch (8), and a spread spectrum Encoding circuit (9). The antenna array is composed of omnidirectional antennas with 10 antenna units separated by half wavelength. The 10 antenna units are divided into 2 antenna sub-arrays, and each antenna sub-array is composed of 5 adjacent antenna units. The main beam of the antenna sub-array points to the direction of θ=60°, and the radiation cha...

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Abstract

The invention discloses a four-dimensional antenna array based secret communication system and a method thereof. The system basically comprises an antenna unit, a high-speed radio frequency switch, a high-precision local oscillation source, a power amplifier, a switch control circuit and the like. The system and the method are characterized in that a phase center of an array is moved by controlling of working time sequences of all array elements (or subarrays) in the antenna array, modulation of information is finished at an antenna end, signals which are required to be transmitted are synthesized in a specific direction only, signals which are required to be transmitted can not be synthesized in other directions, a plurality of modulation methods, such as quadrature phase shift keying (QPSK), binary phase shift keying (2PSK) and M spread spectrum sequences, can be achieved, and the structure of a transmitter can be simplified. Compared with traditional secret communication methods, the method is a novel physical layer encryption method and can effectively resist eavesdropping receivers in side lobe directions. The system and the method are applied to wireless communication systems.

Description

technical field [0001] The invention belongs to the field of wireless communication, and particularly relates to using a four-dimensional antenna array to control the phase center of the array, so as to realize direction modulation and secret communication. Background technique [0002] The concept of a four-dimensional antenna array was first proposed in 1959 by Shanks and Bickmore of the Hughes Aircraft Company in the United States. The four-dimensional antenna array is formed by introducing the time variable into the conventional antenna array with three-dimensional spatial changes. The amplitude and phase weighting of the spatial array elements can be realized by time weighting, thereby increasing the design freedom of the antenna array and making the time modulation Compared with conventional antenna arrays, antenna arrays have more design advantages, such as achieving low sidelobes under uniform excitation, realizing multi-beam and beam scanning, etc. Different from c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/04H04K1/00
Inventor 杨仕文姚瑞林郭晓东李冰袁龙朱全江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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