Fountain code encoding method based on satellite communication

Abstract

The invention discloses a fountain code encoding method based on satellite communication. The method comprises the following steps of A): segmenting a sent file to form a plurality of original information groups; B): carrying out fountain code encoding on the original information groups so as to form coded groups; C): transmitting the coded groups to a receiving end through a satellite link, and performing fountain code decoding after the receiving end receives sufficient data packets; D): if all the original information groups cannot be recovered, feeding back data block numbers needing to beretransmitted and a quality condition of the satellite link to a sending end; if all the original information groups are recovered, not starting a feedback mechanism; and E): if the sending end receives feedback information, according to the quality condition of the satellite link, adjusting fountain code encoding parameters dynamically in real time, and starting a retransmission mechanism. The method has the advantages that the encoding redundancy overhead is effectively reduced, repeated feedback and retransmission are avoided, and the problems that the error rate is high, the transmissiontime delay is long and the like in satellite communication are solved in a targeted mode.

Description

technical field [0001] The invention relates to the field of satellite communication, in particular to a fountain code encoding method based on satellite communication. Background technique [0002] Satellite communication is an important achievement of modern communication technology. It is developed on the basis of ground microwave communication and space technology. It has the advantages of large communication coverage area, long communication distance, wide communication frequency band, and large capacity. Shortcomings such as extension, easy signal attenuation, and high bit error rate. Therefore, the traditional file transfer solution needs to rely on continuous two-way communication between the sender and the receiver, which is obviously not very ideal in practical applications. [0003] In recent years, using digital fountain codes to improve the reliability of transmission is a hot topic, which is evolved from LDPC codes and Tornado codes, and is a sparse graph codi...

AI Technical Summary

Problems solved by technology

However, if the coding redundancy β is set too low, under a certain packet loss rate, the number N of data packets received by the receiving end may be less than the number K of original information packets, which reduces the decoding success rate and increases the number of repeated packets. The number of transmissions; if the encoding redundancy β is set too high, although it can ensure that the decoding success rate is improved, the decoding overhead will be greatly increased

The encoding parameters in the prior art are not properly set, and the advantages of the fountain code in satellite communication are relatively low

Images