Degraded eavesdropping channel rate compatible method based on Polar code

Abstract

The invention discloses a degraded eavesdropping channel rate compatible method based on a punctured Polar code. According to the method, the punctured Polar code is combined with a degraded eavesdropping channel model; according to construction features of the Polar code, a safe bit-channel used for transmitting information is given; according to channel rate requirements of a degraded eavesdropping channel, a proper puncturing matrix is built, and the degraded eavesdropping channel rate compatible method based on the Polar code is achieved; because eavesdroppers do not know the puncturing matrix, the coded code word length is reduced through puncturing operation, information is hidden through the puncturing operation, the complexity that the eavesdroppers recover original information through code words received through wiretapping is increased, and system safety is guaranteed; furthermore, the puncturing method ensures that all codes in the same group of rate-compatible codes can be achieved through the same group of encoders, and therefore the complexity of emitters and receivers is greatly reduced.

Description

Technical field [0001] The invention relates to the technical field of wireless communication information security, in particular to a method for compatibility of degenerate eavesdropping channel rates based on Polar codes. Background technique [0002] In recent years, with the continuous development of wireless communication technology and people's increasing demand for services, the requirements for the security and rate compatibility of wireless communication systems have become higher and higher. Physical layer security has become an important branch of information security and has attracted widespread attention. The Wyner Wiretap Channel model is an important model for physical layer security research, and its important index "security capacity" has become the key to information security research. [0003] The Wyner eavesdropping channel model includes the main channel between legitimate users Alice and Bob and the eavesdropping channel between illegal users Eve and the send...

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Problems solved by technology

Moreover, the security of the wyner wiretapping channel model can also be improved through puncturing. For example, in the Gaussian wiretapping channel model in 2011, Klinc et al. combined the puncturing technology with the LDPC code structure to make the wiretapping channel signal-noise When the ratio is less than the minimum signal-to-noise ratio of the main channel, the eavesdropper cannot obtain any effective information

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