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OFDM secure transmission method combining subcarrier pairing and signal inversion

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

Active Publication Date: 2018-10-19
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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  • OFDM secure transmission method combining subcarrier pairing and signal inversion
  • OFDM secure transmission method combining subcarrier pairing and signal inversion
  • OFDM secure 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) ,...,...

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Abstract

The invention discloses an OFDM secure transmission method combining subcarrier pairing and signal inversion. According to the method, subcarrier serial numbers are re-sequenced on the basis of knownchannel state information, subcarriers are divided into two parts by a midpoint adopted as a boundary, wherein the first half of the subcarriers are set to be poor carriers, and the second half of thesubcarriers are set to be good carriers; pairing mapping relationships are defined between poor channels and good channels; inversion signals and useful signals are sent separately, and a receiving end receives the signals in a combined manner; the average bit error rate of a system and one lower bound of the secrecy capacity of the system are derived by using the theory of the sequential statistic theorem; and simulation verification is carried out, and simulation results show that the method of the invention achieves a good anti-eavesdropping effect, satisfies high security transmission requirements, and has 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 Applications(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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