Method for translating and editing fountain code based on low density parity check code in deep space communication

Abstract

The invention relates to an encoding method based on low-density parity check codes- cascaded codes synthesized by fountain codes in a deep space communication system. The method includes step one: information waiting for transmission is divided into a plurality of first-level information units; step two: the first-level information units are encoded by the spring codes to produce second-level information units; step three: the second-level information units are encoded by the low-density parity check codes to produce third-level information units; step four: the third-level information units are transmitted by deep space communication channels; step five: the received third-level information units are decoded by the low-density parity check codes and the successfully-decoded information units are formed into fourth-level information units; and step six: the fourth-level information units are decoded by the spring codes and decrypted. The invention needs no feedback re-transmission and can retrieve the original information by the receiving of subsequent information units and achieve a constant error rate demanded by the communication system under different channel conditions.

Description

technical field [0001] The invention relates to a coding and decoding method in a digital communication system, in particular to a coding and decoding method for synthesizing a concatenated code based on a low-density parity-check code-fountain code in a deep-space communication system. Background technique [0002] The deep space communication channel can be modeled as an ideal channel, and its frequency band resources are relatively sufficient, but the limited amount, size, and long transmission distance of on-board equipment severely restrict its power resources. Therefore, the deep space communication data transmission channel can be regarded as a channel with limited power and abundant bandwidth, and it is a typical transmission channel that trades effectiveness for reliability. [0003] As a key technology of deep space communication, channel coding and decoding technology is a necessary means to ensure the accuracy of information transmission. [0004] The channel of...

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Problems solved by technology

[0007] In order to solve the problems existing in the prior art in deep space communication, the delay is large, the storage capacity and processing capacity of the spacecraft are limited; the handshake process in communication is inefficient; the efficiency of confirmation retransmission is low; The asymmetry of the information rate; when there are multiple receivers, a large amount of redundant data wastes communication resources, feedback explosion and other technical problems. The present invention provides a deep space communication based on low-density parity-check code-fountain code compilation method

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