CN109510687A - A kind of fountain code encoding method based on satellite communication - Google Patents
A kind of fountain code encoding method based on satellite communication Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0057—Block codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1809—Selective-repeat protocols
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- Physics & Mathematics (AREA)
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Abstract
The invention discloses a kind of fountain code encoding method based on satellite communication, including step A): being split to the file of transmission, form the grouping of several raw informations；Step B): raw information is grouped and carries out fountain codes coding, forms coding groups；Step C): coding groups are sent to receiving end by satellite link, and receiving end carries out fountain codes decoding after receiving enough data packets；Step D): such as fail to recover whole raw information groupings, by the quality condition of the data block number and satellite link that need to retransmit, feeds back to transmitting terminal；If recovering whole raw information groupings, do not start feedback mechanism；Step E): if transmitting terminal receives feedback information, according to the quality condition of satellite link, the fountain codes encoding parameter of dynamic adjustment in real time, and start retransmission mechanism.The advantage is that: effectively reducing coding redundancy expense, multiple repeat request is avoided, specific aim solves the problems such as bit error rate is high, and propagation delay time is long in satellite communication.
Description
Technical field
The present invention relates to satellite communication field more particularly to a kind of fountain code encoding methods based on satellite communication.
Background technique
Satellite communication is the important achievement of modern communication technology, it is on the basis of terrestrial microwave communication and space technology
Grow up, has communication coverage area big, the advantages that communication distance is remote, and communications band is wide, and capacity is big, but there is also biographies
Extend when defeated, the disadvantages of signal is easily decayed, and the bit error rate is big.Therefore, it using traditional file transmission scenario, needs to be dependent on transmitting terminal
And the two-way communication of receiving end duration, it is apparently not very ideal in practical applications.
In recent years, the reliability that transmission is improved using digital fountain code coding is the popular project of a comparison, it is
It is a kind of using erasure channel as the sparse graph code of background from LDPC code and the evolution of Tornado code.So-called digital fountain
Code, refers to the transmitting terminal random coded of this coding, generates any number of coding groups by K original packet, source node is not
In the case where knowing whether these data packets are successfully received, data packet is persistently sent.As long as and receiving end receives K (1+ ε)
The random subset of a coding groups receives a N less times greater than K value, so that it may successfully restore with high probability by decoding
Whole original packets.The coding mode has significant advantage in satellite communications data transmission without code rate characteristic with it, by right
Information makes full use of between node, efficiently solves in satellite link since part of nodes withers away, the unreliable transmission of link etc. is made
At information lose, communication failure the problems such as.
Fountain codes can be divided into stochastic linear fountain codes, LT code, Raptor code and RaptorQ code.Traditional LT code, is sending out
Sending end selects d source data packet from raw information grouping according to certain degree distribution function first, then to selected source
Data packet carries out XOR operation, obtains a coding and wraps and send；After receiving end only needs to receive slightly larger than K coding packet, just
Centainly raw information grouping can be recovered by probability.LT code is the first practical fountain codes, but the coding packet of its generation
In need the very high packet of a small amount of Connected degree, for guaranteeing the good covering to all data packets, thus guarantee decoding it is complete
Property, however the presence of these high Connected degree packets consumes many coding and decoding xor operations, while also reducing low Connected degree packet
Ratio reduces decoding success rate to can translate the size of collection during reducing decoding.
Based on the understanding to LT code, Raptor code is first grouped with one point raw information by the way of two steps coding
Group code carries out precoding, then carries out coding transmission to data using the LT code of a reduction.Compared to LT code, Raptor code passes through
Combined optimization weakens the code rate and parameter of LT code and precoding, can obtain lower encoding and decoding complexity and open in identical decoding
Higher decoding success rate under pin.And RaptorQ code is the Raptor code that one kind is defined on galois field GF (256), it after
The essential attribute and encoding and decoding process flow of all Raptor codes have been held, while may be implemented to open decoding needed for decoding success
Pin substantially reduces.
Satellite communication is carried out by the way of fountain codes coding, needs to set raw information grouping in the communication incipient stage
K, the encoding parameters such as small packet length L and coding redundancy degree β.If encoding parameter design is ingenious, encoding and decoding will be greatly improved
Efficiency and decoding success rate.But if coding redundancy degree β setting it is too low, under certain packet loss, receiving end is received
Data packet number N may be less than raw information packet count K, so that decoding success rate is reduced, to increase number of retransmissions；If
Coding redundancy degree β is set excessively high, although can guarantee that decoding success rate is improved, decoding overheads will be greatly increased.It is existing
There is the inappropriate of the encoding parameter setting in technology, advantage of the fountain codes in satellite communication is lower.
Summary of the invention
The purpose of the present invention is to provide one kind can dynamically adjust fountain codes encoding parameter in real time, reduces fountain codes compiling
Code expense, improves the fountain code encoding method based on satellite communication of decoding success rate.
To achieve the above object, the invention provides the following technical scheme: a kind of fountain codes coding staff based on satellite communication
Method, which comprises the following steps:
Step A): the file of transmission is split, raw information grouping is formed；
Step B): raw information is grouped and carries out fountain codes coding, forms coding groups；
Step C): coding groups are sent to receiving end by satellite link, and receiving end carries out after receiving enough data packets
Fountain codes decoding；
Step D): if failing to recover whole raw information groupings, the data block retransmitted will be needed to number and defend
The quality condition on stellar chain road, feeds back to transmitting terminal；If recovering whole raw information groupings, do not start feedback mechanism；
Step E): if transmitting terminal receives feedback information, according to the quality condition of satellite link, the fountain of dynamic adjustment in real time
Code encoding parameter, and start retransmission mechanism.
2. a kind of fountain code encoding method based on satellite communication according to claim 1, which is characterized in that step
Cataloged procedure in rapid B the following steps are included:
Step B1): according to the code length K and small packet length L in real-time coding parameter, construct non-singular matrix A；
Step B2): by carrying out inverse transformation to structural matrix A, raw information is grouped and carries out precoding, obtains intermediate compile
Code grouping C；
Step B3): intermediate coding groups C is encoded using code generator, obtains coding groups to be sent.
Further, the step D further includes the queue for storing up to M data being created in receiving end, for depositing
Store up the packet loss of each data block；The queue is arranged to, if failing to restore raw information grouping completely after data receiver is complete,
Then calculate the average packet loss ratio of satellite linkWherein, PiIndicate that the packet loss of i-th of data block, N indicate data
Block number, is up to M；It will need the data block retransmitted number and represent the real-time packet loss P of satellite link quality conditiontOne
It rises and feeds back to transmitting terminal.
Further, it after transmitting terminal receives feedback information in the step E, gets and represents real-time satellite link-quality
The packet loss P of situationt, further according to formulaIt calculates analysis and obtains real-time fountain codes coding redundancy, wherein β is
Fountain codes coding redundancy degree, β ' indicate the fountain codes coding redundancy under the decoding failure probability of permission；It calculates analysis and obtains reality
When fountain codes coding redundancy after, fountain codes encoding parameter is adjusted in real time, and the data block that retransmits of needs is compiled
Code retransmits.
Compared with prior art, the beneficial effects of the present invention are:
The present invention is able to maintain original fountain codes by the way that RaptorQ code coding mode to be introduced into satellite communication
Can, according to the packet loss of the representative satellite link quality condition of Real-time Feedback, calculates analysis and obtain corresponding fountain codes coding ginseng
Amount, dynamic adjusts in real time, to make that new file transmits or file retransmission is carried out according to newest satellite link quality condition
Fountain codes coding.The present invention targetedly solves the problems, such as that satellite link propagation delay time is long, signal easily declines, the bit error rate is high,
Fountain code coding/decoding expense is greatly reduced, decoding success rate is improved.
Detailed description of the invention
Fig. 1 is fountain code encoding method flow chart of the present invention；
Fig. 2 is that receiving end records satellite link quality condition flow chart in the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figs. 1-2, present embodiment discloses a kind of fountain code encoding method based on satellite communication, step
It is as follows:
Step A): it is split to sent file, forms the grouping of several raw informations；
Step B): raw information is grouped and carries out fountain codes coding, forms coding groups；
Step C): coding groups are sent to receiving end by satellite link, and receiving end carries out after receiving enough data packets
Fountain codes decoding；
Step D): if failing to recover whole raw information groupings, the data block retransmitted will be needed to number and defend
The quality condition on stellar chain road, feeds back to transmitting terminal；If recovering whole raw information groupings, do not start feedback mechanism；
Step E): if transmitting terminal receives feedback information, according to the quality condition of satellite link, the fountain of dynamic adjustment in real time
Code encoding parameter, and start retransmission mechanism.
Based on the introduction in background knowledge, the RaptorQ code for having selected performance better in the step B in the present invention is carried out
Fountain codes coding, specific coding step are as follows:
Step B1): according to the code length K and small packet length L in real-time coding parameter, construct non-singular matrix A；
Step B2): by carrying out inverse transformation to structural matrix A, raw information is grouped and carries out precoding, obtains intermediate compile
Code grouping C；
Step B3): according to the coding redundancy in real-time coding parameter, using code generator to intermediate coding groups C into
Row coding, obtains coding groups to be sent.
Referring to Fig.2, starting in a kind of fountain code encoding method based on satellite communication provided by the invention in file transmission
Stage, receiving end can receive the file information frame, including raw information grouping K, small packet length L and coded data packet number
Measure Nenc。
After receiving the file information frame, receiving end can be in the queue that a storing data is locally created, in order to keep data
Real-time, the size n=M of queue, i.e. queue be Queue (P1,P2,P3……PM)。
A blocks of files has been received every time, records the quantity N of data packetrecv, and packet loss is calculated according to information frame information,
I.e.Record is in the queue.According to the characteristic of first in, first out, the data in queue are updated, what is held the record is most
New satellite link situation.
After file reception, if failing full recovery goes out raw information grouping, according to queue Queue (P1,P2,
P3……PM) in record data, calculate real-time satellite link situationWherein, PiIndicate i-th of data
The packet loss of block, N indicate data block number, are up to M.Finally the data block retransmitted will be needed to number and represent satellite link
The real-time packet loss P of quality conditiontTransmitting terminal is fed back to together.
Refering to fig. 1, after transmitting terminal receives feedback information, the packet loss for representing real-time satellite link quality conditions is got
PtAnd the file block number that demand retransmits.
According to formulaIt calculates analysis and obtains real-time fountain codes coding redundancy, wherein β is fountain codes coding
Redundancy, β ' indicate the fountain codes coding redundancy under the decoding failure probability of permission.It calculates analysis and obtains real-time fountain codes
After coding redundancy, fountain codes encoding parameter is adjusted in real time, and the data block retransmitted to needs carries out coding re-transmission.
Traditional fountain codes coding mode, is encoded by the way of regular coding parameter.If initially set superfluous
It is remaining too low, easily decay in face of satellite link signal, the situation that the bit error rate is big, it will serious packet drop occur, receive termination
The data packet number N receivedrecvIt would become hard to be greater than raw information packet count K, lead to decoding failure, and then need to carry out repeatedly text
Part re-transmission could all translate raw information grouping；If redundancy initially set is excessively high, extended feelings when satellite link are faced
Condition, the time for transferring a file will greatly increase, although receiving end decoding success rate is very high, file transmission efficiency pole
It is low.
Compared to traditional fountain codes coding mode, a kind of fountain codes coding staff based on satellite communication proposed by the present invention
Method obtains the packet loss P of satellite link according to the satellite link situation that receiving end is fed back in real timet, and calculate analysis and be suitble to
Fountain codes redundancy β, the fountain codes encoding parameter of dynamic adjustment in real time, and new encoding parameter is applied to file retransmission and new
The transmission of file.It is general only to need primary retransmit even without re-transmission, Ji Ke using fountain code encoding method of the invention
Raw information grouping is restored in receiving end completely, reduces coding redundancy to a certain extent, and the file improved in satellite communication passes
Defeated efficiency.
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art,
It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is carried out etc.
With replacement, all within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection scope of invention.
Claims (4)
1. a kind of fountain code encoding method based on satellite communication, which comprises the following steps:
Step A): the file of transmission is split, raw information grouping is formed；
Step B): raw information is grouped and carries out fountain codes coding, forms coding groups；
Step C): coding groups are sent to receiving end by satellite link, and receiving end carries out fountain after receiving enough data packets
Code decoding；
Step D): if failing to recover whole raw information groupings, the data block number and satellite chain that will need to retransmit
The quality condition on road, feeds back to transmitting terminal；If recovering whole raw information groupings, do not start feedback mechanism；
Step E): if transmitting terminal receives feedback information, according to the quality condition of satellite link, the fountain codes of dynamic adjustment in real time are compiled
Code parameter, and start retransmission mechanism.
2. a kind of fountain code encoding method based on satellite communication according to claim 1, which is characterized in that step B
In cataloged procedure the following steps are included:
Step B1): according to the code length K and small packet length L in real-time coding parameter, construct non-singular matrix A；
Step B2): by carrying out inverse transformation to structural matrix A, raw information is grouped and carries out precoding, obtains intermediate code point
Group C；
Step B3): intermediate coding groups C is encoded using code generator, obtains coding groups to be sent.
3. a kind of fountain code encoding method based on satellite communication according to claim 1, which is characterized in that the step
Rapid D further includes the queue for storing up to M data being created in receiving end, for storing the packet loss of each data block；It should
Queue is arranged to, if failing to restore raw information grouping completely after data receiver is complete, calculates being averaged for satellite link and loses
Packet rateWherein, PiIndicate that the packet loss of i-th of data block, N indicate data block number, be up to M；It will need
The real-time packet loss P of satellite link quality condition is numbered and represented to the data block of re-transmissiontTransmitting terminal is fed back to together.
4. a kind of fountain code encoding method based on satellite communication according to claim 1, which is characterized in that the step
After transmitting terminal receives feedback information in rapid E, the packet loss P for representing real-time satellite link quality conditions is gott, further according to public affairs
FormulaIt calculates analysis and obtains real-time fountain codes coding redundancy, wherein β is fountain codes coding redundancy degree, and β ' is indicated
Fountain codes coding redundancy under the decoding failure probability of permission；It is right after calculating analysis obtains real-time fountain codes coding redundancy
Fountain codes encoding parameter is adjusted in real time, and the data block retransmitted to needs carries out coding re-transmission.
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Cited By (11)
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| CN111769913A (en) * | 2020-05-20 | 2020-10-13 | 上海橙群微电子有限公司 | Data transmission method, electronic equipment and computer readable storage medium |
| WO2020220537A1 (en) * | 2019-05-02 | 2020-11-05 | Nokia Shanghai Bell Co., Ltd. | Controlling data transmission in wireless communication |
| CN112367143A (en) * | 2020-09-25 | 2021-02-12 | 北京遥测技术研究所 | Anti-interference coding transmission method based on fountain codes |
| CN112787704A (en) * | 2020-12-25 | 2021-05-11 | 胡友彬 | Vehicle-mounted intelligent satellite meteorological hydrological communication system |
| CN113037356A (en) * | 2021-02-01 | 2021-06-25 | 北京邮电大学 | HARQ method for adaptively adjusting code block group size in satellite communication system |
| CN113098661A (en) * | 2021-03-26 | 2021-07-09 | 哈尔滨工业大学 | Fountain code-based file transmission method under satellite channel |
| CN114244472A (en) * | 2021-12-13 | 2022-03-25 | 上海交通大学宁波人工智能研究院 | Industrial automation fountain code data transmission device and method |
| CN114422024A (en) * | 2022-04-01 | 2022-04-29 | 深圳航天东方红卫星有限公司 | Satellite-ground closed loop high-reliability data transmission method |
| CN115567510A (en) * | 2022-09-13 | 2023-01-03 | 中国电子科技集团公司第十研究所 | Method for improving on-track file annotating effectiveness |
| WO2023005313A1 (en) * | 2021-07-26 | 2023-02-02 | 华为技术有限公司 | Link monitoring method and device |
| CN116847453A (en) * | 2023-09-04 | 2023-10-03 | 四川轻化工大学 | Satellite data transmission and satellite Internet of things access time management method |
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| WO2020220537A1 (en) * | 2019-05-02 | 2020-11-05 | Nokia Shanghai Bell Co., Ltd. | Controlling data transmission in wireless communication |
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| CN114244472A (en) * | 2021-12-13 | 2022-03-25 | 上海交通大学宁波人工智能研究院 | Industrial automation fountain code data transmission device and method |
| CN114244472B (en) * | 2021-12-13 | 2023-12-01 | 上海交通大学宁波人工智能研究院 | Industrial automatic fountain code data transmission device and method |
| CN114422024A (en) * | 2022-04-01 | 2022-04-29 | 深圳航天东方红卫星有限公司 | Satellite-ground closed loop high-reliability data transmission method |
| CN115567510A (en) * | 2022-09-13 | 2023-01-03 | 中国电子科技集团公司第十研究所 | Method for improving on-track file annotating effectiveness |
| CN115567510B (en) * | 2022-09-13 | 2024-04-26 | 中国电子科技集团公司第十研究所 | Method for improving on-orbit file annotating effectiveness |
| CN116847453A (en) * | 2023-09-04 | 2023-10-03 | 四川轻化工大学 | Satellite data transmission and satellite Internet of things access time management method |
| CN116847453B (en) * | 2023-09-04 | 2023-11-14 | 四川轻化工大学 | Satellite data transmission and satellite Internet of things access time management method |
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