Information transmission method combining artificial scrambling and ldpc secure coding in satellite-earth link

Abstract

An information transmission method that combines artificial scrambling and LDPC security coding in satellite-to-ground links belongs to the field of satellite communication technology; the method includes: Step 1: Calculate the state vector of the main channel; Step 2: Calculate the main channel state information matrix; Step 3 : Perform LDPC encoding on the information to be sent; Step 4: Construct artificial noise z that is orthogonal to the main channel; Step 5: Calculate the transmission weight of the information to be sent that minimizes the probability of private interruption; Step 6: Continuously send the encoded information to be sent information, and simultaneously uses multi-antenna transmission to send artificial noise; Step 7: The receiving end uses BP decoding algorithm to decode; during the information transmission process, the present invention introduces channel status information into LDPC coding to ensure the security and reliability of communication characteristics; adopt a coding method based on channel state information to avoid problems existing in the application of traditional encryption algorithms in satellite communications; and reduce the complexity of satellite secure communications.

Description

technical field [0001] The invention belongs to the technical field of satellite communication, and in particular relates to an information transmission method combining artificial scrambling and LDPC security coding in a satellite-ground link. Background technique [0002] Compared with terrestrial wireless communications, satellite communications with open orbits and large-scale broadcast characteristics are more vulnerable to security threats such as eavesdropping and interception. The existing countermeasures are mainly to encrypt the data and ensure security at the upper layer of the communication protocol stack. The main problems of the encryption processing are as follows: (1) The probability of cracking is high. Due to the limited processing capacity of satellites, it is difficult to handle complex encryption algorithms. With the rapid development of computers and the emergence of new concepts such as cloud computing and supercomputing, traditional encryption algorit...

AI Technical Summary

Problems solved by technology

Compared with terrestrial communication, satellite communication channels have a more complex communication environment. There are many problems in the application of existing terrestrial communication physical layer security strategies in satellite communication, including not fully considering the reciprocity and uniqueness of communication physical channels. and other characteristics, the long delay of the link, the complex composition of the satellite communication channel, etc., so it cannot be applied to the satellite security communication

Images