LT (Luby transform) code based anti-interference method for spread spectrum communication

Abstract

The invention discloses an LT (Luby transform) code based anti-interference method for spread spectrum communication. The LT code based anti-interference method includes the following steps: S1, creating an LT code based anti-interference technical model for spread spectrum communication; S2, selecting an LT code degree distribution function; S3, designing an LT code encoding and decoding process. The LT code encoding and decoding process includes an LT code encoding process and an LT code decoding process. The LT code based anti-interference method has the advantages that data information in link communication are subjected to LT code encoding and decoding, so that data loss caused by link breakage during data communication is effectively avoided; the LT code based anti-interference method can be widely applied to anti-interference communication in severe environments, and can solve poor communication in complex environments effectively.

Description

technical field [0001] The invention belongs to the technical field of communication, in particular to an LT code-based spread spectrum communication anti-interference method. Background technique [0002] In the process of data communication, the phenomenon that the communication link is interrupted and it is difficult for the receiving end to recover the source data often occurs. In the prior art, the information dispersive coding characteristics of fountain coding are used to build a cooperative communication system to complete the rapid and large-scale transmission of information. There is also the use of the encoding and decoding characteristics of fountain codes to apply them in frequency hopping communication to improve the anti-interference performance of communication, but the problem of link interruption is not discussed, and there is a lack of research on communication anti-interference modeling and simulation. [0003] Related papers in the prior art: [0004] (...

AI Technical Summary

Problems solved by technology

[0007] Document (1) proposes the idea of ​​adding an on-off flag to the data link to monitor the link. When the on-off flag is not detected, the system automatically starts to re-establish the link application, but this method increases the complexity of the encoding and can only monitor whether the data is lost. After the data is determined to be lost, it needs to be resent to recover the source data

[0008] Document (2) proposes the idea of ​​using a backup link. When the communication link fails, quickly switch the backup link to prevent communication interruption, but this method increases the complexity of hardware implementation and the accuracy of link switching control

[0009] Literature (3) proposes the idea of ​​finding out the damaged data point in transmission, and then searches to the upper level of the damaged point to resend the damaged data to repair the wrong data, but this method increases the complexity of hardware and software implementation, and in In the process of searching for damaged data points and retransmission, multiple handshakes are required at the communication receiving and receiving ends. For a communication system in a multi-interference source environment, the data loss rate will increase, and feedback will be generated when there are multiple receivers. Explosion, these will seriously lead to low efficiency of the handshake process and retransmission, and even the communication system is overloaded and paralyzed

[0010] Existing technologies use monitoring flags and backup data links to solve and restore data loss and damage caused by link interruptions. These methods cannot fundamentally solve the problem of data retransmission, and the complexity of hardware implementation is high

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