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Efficient direction modulation method and system

A directional modulation and high-efficiency technology, applied in multi-frequency code systems, diversity/multi-antenna systems, space transmit diversity, etc., can solve the problems of weak anti-scanning ability and anti-interception ability, and achieve strong anti-scanning ability and anti-deciphering ability , the calculation time is shortened, and the effect of improving the safety rate

Pending Publication Date: 2022-07-29
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

But this method has a major disadvantage: due to the use of a single transformation order, the eavesdropping party Eve can find the inverse transformation order through exhaustive search, so the anti-scanning ability and anti-interception ability of the system are very weak

Method used

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  • Efficient direction modulation method and system
  • Efficient direction modulation method and system
  • Efficient direction modulation method and system

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Embodiment Construction

[0031] The present invention will be described in detail below.

[0032] refer to figure 1 , at the transmitter, including the following five steps:

[0033] (1) Baseband modulation is performed on the input bit stream data to obtain a one-dimensional modulation signal;

[0034] Baseband modulation is performed on the input bit stream data to obtain the modulated signal s=[s 0 ,s 1 ,…,s L -1], L represents the length of the modulated signal s. For the convenience of subsequent calculations, the value of L is usually the product of two positive integers greater than 1, denoted L=R×G, where both R and G are positive values ​​greater than 1. Integer.

[0035] (2) using the sub-block division method to convert the one-dimensional modulation signal s into a two-dimensional signal matrix S;

[0036] Two sub-block segmentation methods can be used in this process, the first is: adjacent segmentation method, such as formula (2)

[0037] S=[s 1 ;s 2 ;…;s r ;…;s R ], r=1,2,…,R...

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Abstract

The invention provides an efficient direction modulation method. According to the technical scheme, the method comprises the following five steps: (1) carrying out baseband modulation on input bit stream data to obtain a one-dimensional modulation signal s; (2) converting the one-dimensional modulation signal s into a two-dimensional signal matrix S by using a sub-block segmentation method; (3) performing row dimension transformation on each row vector in the two-dimensional signal matrix S to obtain a two-dimensional signal matrix S1 after row dimension transformation; (4) performing column dimension transformation on each column vector in the two-dimensional signal matrix S1 to obtain a two-dimensional signal matrix S2 after column dimension transformation; and (5) sequentially connecting the column vectors of the two-dimensional signal matrix S2, and transmitting the column vectors through an antenna after precoding. According to the method, the anti-interception performance is enhanced, the safety rate is improved, and the bit error rate is relatively low.

Description

technical field [0001] The invention relates to the technical field of digital communication, in particular to a signal processing method and system with anti-interception and anti-deciphering. Background technique [0002] DM (directional modulation, directional modulation), as a directional PLS (physical layer security, physical layer security) transmission technology realized by a multi-antenna technology in the air domain, can be used for phased arrays and frequency-controlled arrays. For the convenience of description, taking the phased array as an example, the DM method based on the phased array is: assuming that the uniform linear phased array includes N antennas, there is a transmitter Alice, a legal receiver Bob and an eavesdropper Eve in the free space , the desired direction and the eavesdropping direction are θ with respect to the first antenna element of the transmitter Alice, respectively B and θ E ,θ B ≠θ E . At the transmitting end, baseband modulation i...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04L27/26
CPCH04B7/0613H04L27/2627
Inventor 王世练周壮胡礼骆俊杉王昊赖鹏辉陈炜宇张炜吴颖洁
Owner NAT UNIV OF DEFENSE TECH