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Atmospheric turbulence optical channel shared random bit extraction system based on space diversity time-sharing gating

A technology of space diversity and atmospheric turbulence, applied in the field of information security

Active Publication Date: 2021-03-12
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

However, if the switching measurement is performed between different sub-channels, for example, in the case of n sub-channels, the received optical signal of the first sub-channel is measured at the first sampling time to obtain a sampling value of 1, and at the second sampling time the first sub-channel The received optical signals of two sub-channels are measured to obtain the sampling value 2, and so on. At the nth sampling time, the nth sub-channel received optical signal is measured to obtain the sampling value n, and then at the n+1 sampling time One sub-channel receives the optical signal to measure the sampling value n+1, and so on, the correlation between two adjacent sampling values ​​​​of the obtained sampling value sequence will be significantly smaller than the sampling obtained by simply measuring a single sub-channel Correlation between two adjacent sampled values ​​of a sequence of values

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  • Atmospheric turbulence optical channel shared random bit extraction system based on space diversity time-sharing gating
  • Atmospheric turbulence optical channel shared random bit extraction system based on space diversity time-sharing gating
  • Atmospheric turbulence optical channel shared random bit extraction system based on space diversity time-sharing gating

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[0023] In order to make the features and advantages of the method more clear, the method will be further described below in conjunction with specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. In this embodiment, the first space diversity terminal and the second space diversity terminal are respectively located on the roofs of two tall buildings. In this embodiment, the first photodetector (108) and the second photodetector (208) are PIN photodetectors. The first laser (100) and the second laser (200) output laser signals with stable power, and the power of the laser signals output by the first laser (100) is equal to the power of the laser signals output by the second laser (200). The paper published in "Journal of Cryptography", Volume 2, Issue 2, 2015, pages 113-121, has a detailed introduction to the bit error estimation, key agreement, and error checking operations in the post-process...

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Abstract

The invention discloses an atmospheric turbulence optical channel shared random bit extraction system based on space diversity time-sharing gating. According to the invention, the time-sharing gatingis used to randomly change a spatial diversity sub-channel through which a laser signal emitted by the laser reaches a photoelectric detector, so that random switching measurement of different sub-channels of spatial diversity is realized; by performing random switching measurement on different sub-channels of spatial diversity, it can be ensured that received optical signal sampling values obtained by continuous two-time sampling measurement are approximately statistically independent when received optical signal sampling operation is performed under the condition of a sampling time intervalsmaller than the fading autocorrelation time length of atmospheric turbulence optical signals. Therefore, when the random bit extraction rate is improved by reducing the sampling time interval of a computer acquisition system, the damage to the randomness of the extracted bit sequence can be reduced by using the method and the device.

Description

technical field [0001] The invention belongs to the technical field of information security, and relates to an atmospheric turbulence optical channel shared random bit extraction system based on space diversity and time-division gating. Background technique [0002] A Chinese invention patent with the application number 201911247093.7 discloses a shared random bit extraction method for atmospheric turbulent optical channels based on the spectrum domain. The background technology section of the description of the invention patent mentions that, in general, in order to ensure that the extracted bit sequence has good randomness, the time interval between two consecutive sampling measurements is required to be greater than the autocorrelation time length of random optical signal fading. The Chinese invention patent with the application number 201911247093.7 first transforms the time-domain data of random optical signal fading obtained by continuous acquisition into the spectral ...

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Application Information

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IPC IPC(8): H04L9/08H04B10/079H04B10/112H04B10/70H04B10/50
CPCH04L9/0869H04L9/085H04L9/0852H04B10/0795H04B10/112H04B10/70H04B10/503
Inventor 陈纯毅
Owner CHANGCHUN UNIV OF SCI & TECH
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