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A secure OFDM transmission method combining subcarrier pairing and signal inversion

A technology for signal inversion and secure transmission, applied in security devices, transmission systems, digital transmission systems, etc., can solve problems such as reciprocity errors, achieve simple system models, improve system security, and improve system average bit error rate performance Effect

Active Publication Date: 2020-03-17
XI AN JIAOTONG UNIV
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  • Description
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Problems solved by technology

Moreover, due to the imperfect reciprocity of the channel in actual transmission, a certain reciprocity error will inevitably be brought, and most schemes do not consider its impact

Method used

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  • A secure OFDM transmission method combining subcarrier pairing and signal inversion
  • A secure OFDM transmission method combining subcarrier pairing and signal inversion
  • A secure OFDM transmission method combining subcarrier pairing and signal inversion

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Embodiment Construction

[0058] The invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it is not used as a basis for any limitation on the invention.

[0059] refer to figure 1 , the present invention is a OFDM secure transmission strategy that combines subcarrier pairing and signal inversion, and the specific steps are as follows:

[0060] Step 1, determine the rearranged subcarrier sequence.

[0061] 1.1 Use the channel state information feedback system to obtain the channel state information for each transmission;

[0062] 1.2 Extract the channel coefficients of each carrier [h 1 ,h 2 ,...,h N ], calculate the square of the modulus value of each subcarrier coefficient|h i | 2 , where i=1,2,...,N. according to |h i | 2 Rearrange the sequence numbers of each subcarrier in ascending order, and obtain a set of channel coefficient sequences of new subcarriers with channel states ranging from poor to good: [h (1) ,h (2) ,...,h...

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Abstract

The invention discloses an OFDM safe transmission method combining subcarrier pairing and signal inversion. The method utilizes known channel state information to rearrange the sequence numbers of each subcarrier, and divides it into two parts with the midpoint as the boundary. Set the first half as a bad carrier and the second half as a good carrier. A pairing mapping relationship is defined between the bad channel and the good channel, the inverted signal and the useful signal are sent separately, and the receiving end performs joint reception. The average bit error rate of the system and a lower bound of the system's confidentiality capacity are deduced by using the theory of order statistics theorem, and the simulation verification is carried out. The simulation results show that our scheme has achieved a good anti-eavesdropping effect and achieved a good security transmission Requirements, and has a certain stability and practicality.

Description

technical field [0001] The invention belongs to the technical field of wireless communication physical layer security, and in particular relates to an OFDM security transmission strategy combining subcarrier pairing and signal inversion, which is applicable to various communication networks. Background technique [0002] The natural openness and broadcasting nature of wireless communication systems have brought great challenges to transmission security. In order to ensure communication security, the traditional method is to learn from the security mechanism of the wired network and implement security protection at the upper layer of the protocol. This method assumes that the eavesdropper has limited computing power and cannot crack it in a short time. However, with the development of high-speed computers, traditional encryption methods are threatened. Physical layer security (PLS) technology emerged as a security method to assist the upper layer in the field of secure commu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W12/00H04W72/04H04W72/08H04L5/00H04L27/26H04W72/54
CPCH04L5/0007H04L27/2626H04L27/2647H04L27/2697H04W12/00H04W72/0453H04W72/542
Inventor 李国兵董秋里吕刚明张国梅
Owner XI AN JIAOTONG UNIV
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