Combined channel state detecting and decoding method based on state transition model

Abstract

The invention discloses a combined channel state detecting and decoding method based on a state transition model, which belongs to the technical field of satellite communication in motion. Interrupted channel structure information is utilized to construct an interrupted channel state transition model, a sum-product algorithm is adopted, a channel transition probability function is utilized to update channel state variable node messages by means of a factor graph structure, and iterative computation is carried out continuously to obtain channel state distribution and decoding results. According to the invention, the channel transition probability function is utilized to update channel state variable node messages, the dependence on the information symbol length is effectively lowered, and under a low signal to noise ratio, the channel state information is well detected. The method can achieves the error detection probability identical with that a channel state information detection algorithm based on signal energy with relatively high detection precision. The method has the following substantial advantages that the detection precision is high, and detection and decoding are carried out in a combined manner.

Description

technical field [0001] The invention belongs to the technical field of satellite communication in motion, and in particular relates to a joint channel state detection and decoding method based on a state transition model. Background technique [0002] In recent years, satellite communications have developed rapidly, and the types of services carried are also increasing. Among them, On-the-Move is a field that has been widely valued and developed rapidly in satellite communication. Communication-in-motion technology refers to the technology that can still carry out uninterrupted broadband satellite communication when vehicles, ships or aircraft are in the process of moving. Unavoidable antenna pointing jitter during carrier movement can cause random interruptions. In addition, the carrier often encounters obstructions to the wireless signal during its movement, such as random obstructions caused by passing through trees and buildings. In the mobile communication of the hel...

AI Technical Summary

Problems solved by technology

The traditional channel state detection method is a channel state information detection algorithm based on signal energy. In the case of low signal-to-noise ratio, this algorithm cannot take into account the false detection probability and detection accuracy.

At the same time, in practical applications, the continuous change of the signal-to-noise ratio of the received signal will further degrade the actual performance

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