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Wireless transmission method for varied error protective fountain code

A technology of wireless transmission and fountain code, which is applied in the fields of deep space communication and communication signal processing, and can solve problems that do not involve reliability analysis and comparison.

Inactive Publication Date: 2013-04-17
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] "Deep Space File Transmission Method Based on Relay Store-Forward" (application number 201210184667.2) is based on delayed negative acknowledgment CFDP and improves its delay performance, but does not involve reliability analysis and comparison

Method used

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  • Wireless transmission method for varied error protective fountain code
  • Wireless transmission method for varied error protective fountain code
  • Wireless transmission method for varied error protective fountain code

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Taking the data transmission between the Mars probe and the earth base station (“ground station” for short) as an example, the specific implementation process of the “wireless transmission method of fountain codes” of the present invention is described.

[0080] figure 2 , image 3 with Figure 4 They are the schematic diagrams of the parallel two-hop or multi-hop transmission path between the ground station and the planetary probe in this embodiment; where E represents the ground station, M represents the planetary probe, and S 1 ,..., S k Is K near-ground relays, R 1 ,..., R T Relay for T planets. Among them, the two-hop path has the following two types:

[0081] 1) The ground station communicates with the planetary probe through the near-earth relay;

[0082] 2) The ground station communicates with the planetary probe through the planetary relay.

[0083] Among them, the three-hop path is the two-way communication path between the ground station and the planetary probe via ...

Embodiment 2

[0114] The application conditions of this embodiment are the same as those of embodiment 1, that is, the downlink data transmission between the planetary probe and the ground station, but the transmission mode adopts the reliable transmission mode, the specific process is as follows:

[0115] Step one and step two are the same as in Example 1.

[0116] Step 3: Perform the transmission of the fountain coded data packet of the transmission method of the present invention based on the single-hop path between the planetary probe at the transmitting end and the ground station at the receiving end. The transmission method adopts the reliable transmission mode.

[0117] Among them, the transmission steps of the reliable transmission mode of the planetary probe at the transmitting end are as follows:

[0118] Step 3.g1 is the same as step 3.e1 in embodiment 2: create "start information file data packet", this data packet contains source address: planetary probe, destination address: ground st...

Embodiment 3

[0139] The "wireless transmission of fountain codes" of the present invention has two major advantages: reducing transmission delay and system overhead.

[0140] First, in terms of transmission delay: the comparison between the fountain code transmission method proposed by the present invention and CFDP. First assume that the CFDP file sending time is T_CFDP:

[0141] T ARQ = T prop ( 1 + 2 * ( n ‾ - 1 ) ) + T _ CFDP - - - ( 1 )

[0142] Where T prop = Communication distance / electromagnetic wave propagation speed, uniformly according to the minimum transmission of 200 seconds;

[0143] Assuming that K=1000 fountain packets and the fountain coding time is T_FT, then the packet loss rate p f When recovering 1000 original packets, the coded packets that need to be sent are expected to be: transmission The time required for a fountain packet is: T_FTTr=(1+ε trans )*T_CFDP;

[0144] In this embodiment, in step one, the...

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Abstract

The invention relates to a wireless transmission method for a varied error protective fountain code, belonging to the technical field of deep space communication and communication signal processing. According to the wireless transmission method, on the basis of the varied error protective fountain code, the document transmission process of current deep space communication is improved, based on fully considering the link parameter Eb / N0 and the packet loss ratio indicating the status of a link circuit, a redundancy is added by a sending end and is received by decoding, the reliability performance of an unreliable document transmission service in deep space communication is enhanced, and when a rank r is equal to 1, the transmission can be simplified into wireless transmission on the basis of an equal error protective fountain code.

Description

Technical field [0001] The invention relates to a wireless transmission method of unequal error protection fountain codes, which belongs to the technical field of deep space communication and communication signal processing. Background technique [0002] With the increasingly complex space environment and the expansion of space detection range, point-to-point deep-space communication scenarios can no longer meet the needs of future deep-space detection. Realization of deep-space satellites, detectors, and ground monitoring stations based on the relay cooperation method is currently deep. Research hotspots in the field of air communication. It has been more than ten years since the fountain code was produced, and it has gradually become practical, and it is listed as the application layer standard of multimedia multicast by 3GPP. Two typical practical fountain codes: LT and Raptor fountain codes are Equal Error Protection (EEP) fountain codes. The document "Video-on-demand broad...

Claims

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Application Information

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IPC IPC(8): H04L1/00
Inventor 卢继华安建平杨雷卜祥元李祥明
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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