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

A technology of combining channels and channel states, applied in error detection coding using multi-bit parity bits, data representation error detection/correction, error correction/detection using block codes, etc. Unable to take into account the problems of false detection probability and detection accuracy

Active Publication Date: 2016-10-26
TSINGHUA UNIV
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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

Method used

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

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Embodiment

[0081] The present invention takes figure 2 The simulation algorithm is shown as an example. In this simulation, the channel coding uses (2048,8192) LDPC codes, the modulation method is QPSK modulation, and the channel interruption time accounts for 10% of the total time. The length of each frame is 8192 symbols, and the interrupt position is randomly set. The total number of iterations of the algorithm is set to 10, the number of individual iterations of the LDPC decoder part is set to 3, and the channel model parameters P=0.9, L=32. The simulation flow is given below to facilitate the understanding of the features and advantages of the present invention.

[0082] (1) using LDPC codes to encode the transmitted information bits;

[0083] (2) interleaving the encoded information bits;

[0084] (3) inserting reference symbols to the information bits after interleaving;

[0085] (4) performing QPSK symbol mapping on the information inserted into the reference symbol to obta...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/11
CPCH03M13/1111H03M13/1134
Inventor 倪祖耀张晋华贾浩歌匡麟玲
Owner TSINGHUA UNIV
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