Deep space multi-file transmission method based on fountain codes

A transmission method and fountain code technology, applied in the field of deep space communication, can solve problems such as large transmission delay, and achieve the effect of improving the success rate, good compatibility and practicability, and reducing the amount of data

Active Publication Date: 2014-12-24
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The existing deep space communication transmission strategy cannot effectively deal w...

Method used

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  • Deep space multi-file transmission method based on fountain codes
  • Deep space multi-file transmission method based on fountain codes
  • Deep space multi-file transmission method based on fountain codes

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Embodiment Construction

[0062] A non-limiting embodiment is given below in conjunction with the accompanying drawings to further illustrate the present invention. It should be understood, however, that these descriptions are exemplary only, and are not intended to limit the scope of the invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0063] refer to figure 1 , the present invention proposes a deep-space multi-file transfer strategy based on fountain codes on the basis of traditional file transfer protocols, which mainly includes the following steps:

[0064] Step 1), at the sending end, the file to be sent is divided to form k original data packets, each of which has a size of L bytes;

[0065] Step 2), the sender determines the number of coded packets K according to the latest channel status and the number of data packets received, performs fountain coding on the...

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Abstract

The invention discloses a deep space multi-file transmission method based on fountain codes. According to the method, the codeless characteristic of the fountain codes is fully utilized, and a forward channel is fully utilized to reduce the data size on a backward channel, so that the link utilization rate is increased, and time delay is shortened. According to latest packet loss rate information, required coding redundancy is calculated, the success rate of primary transmission is increased, and the redundancy is effectively controlled; with respect to the receiving party, a united decoding algorithm is adopted, coded information is fully utilized, the calculation complexity is lowered, and the success rate of decoding is increased; in the retransmission process, different protection strategies are adopted according to different packet loss conditions to reduce retransmission frequency; a multi-file united transmission strategy is adopted, feedback information of the receiving party is not waited for, files to be transmitted are processed directly, link resources are fully utilized, and time delay is shortened; on the basis of a CFDP, a coding packet is sent as content of a data field, so that good compatibility and practicability are guaranteed. By means of the deep space multi-file transmission method based on the fountain codes, the problems of huge transmission delay, link time varying and channel asymmetry are solved in a targeted mode, the redundancy is effectively controlled, the transmission frequency is reduced, and the goal of efficient and reliable transmission of deep space files is basically achieved.

Description

technical field [0001] The invention belongs to the technical field of deep space communication, and relates to a deep space multi-file transmission method based on fountain codes. Background technique [0002] Deep space communication is the foundation of deep space exploration, carrying the reliable transmission of a large amount of data in deep space exploration. The deep space communication environment has characteristics completely different from the earth communication environment, and the traditional data transmission strategy is no longer suitable for deep space communication. In view of the characteristics of long transmission distance, long delay, high bit error rate, limited power, intermittent link interruption and channel asymmetry in deep space communication, it has become a research hotspot to propose an efficient and reliable file transmission strategy based on the interstellar Internet. [0003] The deep space file transfer strategy mainly has two research ...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/16H04L1/18
Inventor 赵辉方高峰王汝言王琴张鸿梁花
Owner CHONGQING UNIV OF POSTS & TELECOMM
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