Security transmission method based on polarization code under parallel channel

Abstract

The invention relates to a security transmission method based on a polarization code under a parallel channel, and belongs to the technical field of security of physical layers. According to the method, a mapping function is optimized according to channel state information of a main channel to achieve security transmission; the essence of the method is that the characteristic that the polarization code has different polaron channel information bit positions due to different parallel sub-channel arrangement modes under the parallel channel is used for adding the optimized mapping function according to the channel state information of the main channel after the polarization code is coded, and mapping information bits to different parallel sub-channels to transmit, an eavesdropping user cannot acquire the channel state of the main channel and thus cannot accurately decode encrypted information, so that security of information transmission is ensured. Compared the prior art, the method provided by the invention does not need to know channel quality of the eavesdropping channel, can be applied to the scene using the eavesdropping channel as the main channel, and is wider in application range.

Description

technical field [0001] The invention relates to a security information transmission method, in particular to a polar code-based security transmission method under parallel channels, and belongs to the technical field of physical layer security. Background technique [0002] In the 1970s, Wyner constructed the "eavesdropping channel" model based on the information theory method, as shown in the attached figure 1 shown, and analyzes the possibility of establishing an almost completely secure communication link without relying on exchanging keys. In Wyner's "eavesdropping channel" model, when the eavesdropping channel is a degenerated channel of the main channel, the channel capacity of the eavesdropper Eve is smaller than the channel capacity of the main channel, then there is a security greater than zero between the sender Alice and the information receiver Bob Capacity; at this time, there is a certain encoding method, so that the legitimate communicator Alice and Bob can c...

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Problems solved by technology

[0004] Although the existing security transmission schemes based on polar codes can obtain security capacity, they all need to know the Channel Status Indicator (CSI, Channel Status Indicator) between Alice and Eve (some schemes need to know the instantaneous CSI, and some schemes need to know the statistical CSI), and the existing schemes need to assume that the wiretapping channel is a degenerate channel of the main channel, but in actual situations, this assumption is not necessarily true, that is, the wiretapping channel and the main channel do not satisfy the degenerate relationship

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