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Channel reciprocity enhancement method based on principal component analysis

A principal component analysis and channel reciprocity technology, applied in the field of key generation, can solve the problems affecting the practical application of wireless channel key generation scheme, high autocorrelation coefficient of channel observation values, poor key consistency, etc. ease of use, security assurance, and improved consistency

Active Publication Date: 2016-12-07
SOUTHEAST UNIV
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Problems solved by technology

[0004] In recent years, in addition to the theoretical analysis, the experimental analysis of the wireless channel key generation scheme under the time division duplex system has also been developed. In addition, in multi-carrier and multi-antenna systems, the autocorrelation coefficients of the frequency, space and time domains of channel observations are high, resulting in low randomness in key generation
These problems will seriously affect the practical application of the wireless channel key generation scheme

Method used

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  • Channel reciprocity enhancement method based on principal component analysis
  • Channel reciprocity enhancement method based on principal component analysis
  • Channel reciprocity enhancement method based on principal component analysis

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Embodiment 2

[0052] In order to apply the present invention to the communication system, both Alice and Bob have strong computing power, Alice and Bob have a high consistency requirement for the generated keys, and Alice and Bob are allowed to have a small amount of information interaction in the scenario , on the basis of using the processing link that is basically consistent with the specific embodiment 1 of the method of the present invention, the division of channel feature samples into groups is the same as the calculation link of the principal component signal matrix, and the calculation of the principal component transformation matrix is ​​modified as follows:

[0053] 1. The processing steps of the principal component transformation matrix calculation link are as follows:

[0054] 1) if image 3 Alice is shown computing X A The covariance matrix of

[0055] 2) Alice will covariance matrix R A Passed to Bob, Bob receives Alice's covariance matrix as his own covariance matrix R ...

Embodiment 3

[0060] In order to apply the present invention to a communication system in which Alice has strong computing power and Bob has relatively weak computing power, and Alice and Bob are allowed to have a small amount of information interaction, in the case of using the specific implementation mode 1 of the method of the present invention basically On the basis of a consistent processing link, the grouping of channel feature samples is the same as the calculation of the principal component signal matrix, and the calculation of the principal component transformation matrix is ​​modified as follows:

[0061] 1. The processing steps of the principal component transformation matrix calculation link are as follows:

[0062] 1) if Figure 4 Alice is shown computing X A The covariance matrix of

[0063] 2) Alice's covariance matrix R A Do the eigenvalue decomposition, where the diagonal matrix Λ A Represents the eigenvalue matrix, the unitary matrix U A Represents the correspondi...

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Abstract

The invention discloses a channel reciprocity enhancement method based on principal component analysis. The method comprises the following steps: firstly, wireless communication both parties Alice and Bob independently collect the measurement values of uplink and downlink channel characteristics; then, the collected measurement values of the uplink and downlink channel characteristics are independently subjected to sample grouping division to obtain channel characteristic sample groups; the wireless communication parties Alice and Bob carry out principal component analysis processing on each channel characteristic sample group; and finally, a processing result with high reciprocity is obtained. By use of the channel reciprocity enhancement method, the problems of the reciprocity reduction of the measurement values of the channel characteristics due to measurement noise and environmental noise and insufficient randomness of a secret key generated by a wireless channel due to high correlation between the measurement values are solved. The channel reciprocity enhancement method is used for enhancing the safety of a wireless communication system, can be specifically applied to fields including secure communication, military communication and the like, and can be expanded to a multi-node communication scene.

Description

technical field [0001] The invention belongs to the field of communication security and relates to key generation technology in wireless communication systems. Background technique [0002] With the development of science and technology, wireless communication equipment has increased dramatically, and the openness of wireless transmission media, the mobility of wireless terminals and the instability of network structure also make the reliability and security of transmission face severe tests. The traditional security solution is to encrypt data with public and private keys at the network layer, while private key encryption faces the problem of key management and distribution, while public key encryption is too complex. However, LTE / LTE-Advanced, which is currently being promoted and used, is even in the fifth-generation mobile communication standard that is being perfected. The high data transmission rate puts forward stricter requirements on the real-time performance, compl...

Claims

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Application Information

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IPC IPC(8): H04W12/04H04W12/041
CPCH04W12/04
Inventor 李古月胡爱群王栋韩远致李晶琪
Owner SOUTHEAST UNIV
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