CN105959085A - Short-wave communication two-way transmission mode based on fountain code - Google Patents
Short-wave communication two-way transmission mode based on fountain code Download PDFInfo
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- CN105959085A CN105959085A CN201610500094.8A CN201610500094A CN105959085A CN 105959085 A CN105959085 A CN 105959085A CN 201610500094 A CN201610500094 A CN 201610500094A CN 105959085 A CN105959085 A CN 105959085A
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- 238000004891 communication Methods 0.000 title claims abstract description 55
- 230000005540 biological transmission Effects 0.000 title claims abstract description 33
- 238000012545 processing Methods 0.000 claims abstract description 24
- 238000009432 framing Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 19
- 102000006479 Heterogeneous-Nuclear Ribonucleoproteins Human genes 0.000 claims description 4
- 108010019372 Heterogeneous-Nuclear Ribonucleoproteins Proteins 0.000 claims description 4
- 230000003044 adaptive effect Effects 0.000 claims description 4
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 208000032370 Secondary transmission Diseases 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 4
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Classifications
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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
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
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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
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Abstract
The invention discloses a short-wave communication two-way transmission mode based on a fountain code. The mode is a short-wave wireless communication data transmission mode and specifically is the transmission mode made for the condition that a wireless transmission channel is instable and the transmission is unreliable. The mode belongs to related technical fields such as short-wave radio station wireless communication systems and data encoding/decoding. The short-wave communication system based on the fountain code is composed of a central control module, a communication protocol processing module and a data link processing module. The communication protocol processing module is composed of an encoding/decoding unit, a framing unit and a speed regulation unit. Through combination of the code rate independence of the fountain code and application features of large scale data distribution and reliable broadcasting of the fountain code, and the state feedback of a receiving end, the sending efficiency can be greatly improved by carrying out self-adaptive speed change, and addition and subtraction of one-time sending quantity.
Description
Technical field
The present invention relates to a kind of HF Wireless Communication data transfer mode, especially for wireless biography
Defeated channel is unstable, transmits a kind of transmission means that insecure situation is formulated, and belongs to shortwave electricity
The correlative technology fields such as platform wireless communication system, data encoding and decoding.
Background technology
Shortwave refer to wavelength between 100m～10m, frequency is at the electromagnetism of 3MHz～30MHz
Ripple.Short wave communication is made by a kind of communication mode that shortwave realizes.Short wave communication is by launching electricity
Ripple arrives reception equipment through ionospheric reflection, it is possible to achieve longer-distance radio communication, is
The Main Means of telecommunication.Although new communication continues to bring out, but short wave communication
This kind of ancient and traditional communication mode relies on its natural advantage not the most to be eliminated,
Nevertheless suffer from global most attention on the contrary, in the most more new development.Because it has
The advantage that other communication system does not possesses.First, shortwave is the most not by network pivot button and to have
Source relaying system telecommunication means about, if it occur that war or disaster, various communication systems
All may be destroyed or attacked, including cellular base station, telephone line, satellite system etc.,
Once relay system is destroyed, and directly affects the wireless communication in whole region, causes not
The loss that can estimate.No matter which kind of communication mode, its capability to resist destruction and autonomous communication ability all with
Shortwave cannot match in excellence or beauty.Secondly, in mountain area, Gobi desert, the area such as ocean, relay base station covers not
Arriving, rely primarily on shortwave and realize telecommunication with satellite, shortwave is compared with satellite communication, no
Using payment services expense, operating cost is low.Owing to the communication distance of shortwave is remote, the equipment side of carrying
Just so that it is become main military communication mode.In short wave communication use program requests and broadcast more
Form, is suitable for plurality of application scenes, has higher practical value, such as higher level portion each to subordinate
Door is issued the documents, information gathering passback or the condition of a disaster or all bodies such as war report and commander battlefield
Show the important use of short wave communication.
Owing to short wave communication is radio communication, the reliability of transmission is even more important.Short wave communication
Emitting radio waves to get to reception equipment through ionospheric reflection, but ionospheric height and close
Degree easily by round the clock, season, the factor such as weather affected, faced by this phenomenon forefathers propose
A lot of schemes, such as adaptive technique, sudden transmission technology, Digital Signal Processing, difference
Wrong control technology, spread spectrum etc..But in addition from the encoding and decoding of shortwave data and transmission side
Formula aspect can also improve efficiency of transmission significantly, it is to avoid the wasting of resources.It is all the time
Complete transmission file be all use coding after the mode repeatedly retransmitted ensureing that opposite end can be received
To file complete content, but so transmission time is long, and efficiency is low, is difficult to quickly receive and dispatch file.
And file is transmitted concrete situation and is all difficult to hold by receiving-transmitting sides, so a kind of quick, reliable
Transmission means particularly important.
Summary of the invention
Based on existing transmitting efficiency is low and transmission state is difficult to the problem held, the present invention carries
Go out a kind of bidirectional data transmission method based on fountain codes coding with AFH, narrow at shortwave
300bit/s to 2.4kbit/s Adaptive Transmission in band.Utilize the code check independence of fountain codes and its
The application characteristic of large-scale data distribution and reliable broadcast combines debit's state feedback and carries out adaptive
Answer speed change and plus-minus single traffic volume that transmitting efficiency can be greatly improved.
So-called fountain codes, refers to the transmitting terminal random coded of this coding, by k original packet
Generating any number of coding groups, source node is not knowing whether these packets are successfully connect
In the case of receipts, persistently send packet.As long as and receiving terminal receives k (1+ ε) individual coding groups
Random subset, i.e. receive one and obtain N less times greater than original k value, so that it may by decoding with height
Probability (relevant with ε) successfully recovers whole original packet.
Shortwave Communication System based on fountain codes is by middle control module, communication protocol processing module sum
Form according to link processing module.Wherein communication protocol processing module has codec unit, framing list
Unit and speed adjustment unit form.
Bidirectional transmission method is specific as follows:
Step one: middle control module reads in a file, file is carried out piecemeal process, less than one
Block processes according to one piece.One blocks of data is issued communication protocol processing module
Step 2: the blocks of data size subpackage according to the rules that communication protocol processing module will receive,
Obtaining total bag number N=D/S, D is the size of blocks of data, and S is the data volume often wrapped.
These packets are carried out certain redundancy by step 3: determine the number-of-packet sent first
Fountain coding.
Step 4: to often bag data add check bit sum package informatin, package informatin include transmitting terminal ID,
Recipient ID, block ID, bag sum and current Bale No. form frame data.
Step 5: by frame data to data link processes module, data link processes module will
The frame data received are sent to radio station, transmitting terminal arrowband according to the data form in radio station, arrowband, by
Data are launched by radio station in shortwave mode.
Step 6: after radio station, receiving terminal arrowband receives data, obtain every frame data by check bit
The most correct, this adds up bag accuracy and received signal to noise ratio composition duties information after finishing receiving.
Step 7: duties information packet is sent to radio station, arrowband of making a start by receiving terminal radio station.
Step 8: after radio station, arrowband of making a start receives duties information, obtains the decoding of duties information
The bag accuracy of secondary transmission and signal to noise ratio, as parameter to communication protocol processing module communication protocol
The speed adjustment unit of processing module.
Step 9: speed adjustment unit goes out transmission next time according to bag accuracy and the signal-to-noise ratio computation of last time
Bag number and transmission rate.
Step 10: repetition step 4 is to step 9, until radio station, receiving end arrowband receives enough numbers
Fountain codes decoding can be carried out according to bag.
Step 11: receiving terminal communication protocol processing module carries out fountain decoding, recovers passed number
It is believed that breath.
Step 12: successfully decoded, again sends duties information and sends to radio station of making a start, notice
This blocks of data is held to be sent completely.
Step 13: after transmitting terminal parses the duties information that blocks of data is sent completely, middle control mould
Next blocks of data is issued communication protocol processing module by block.Repetition step 2 is to step 13, directly
It is sent completely to all data blocks.
Step 14: stop immediately when transmitting terminal radio station receives the duties being sent completely sending, as
Really time-out has not received duties, then transmitting terminal radio station is restored after repeating to send three times automatically.
Compared with prior art, the present invention has lower beneficial effect.
The transmitted in both directions mode based on fountain codes that this patent proposes compares original single use fountain
Code or other transmitted in both directions modes are a kind of new modes, by fountain codes encode randomness and
The intercommunity of two-way communication combines, and can more preferably be applicable to the transmission of channel relatively unstable shortwave
During, speed-regulating scheme in this paper can be good at combining shortwave bandwidth situation, for short
The transmission data of ripple channel situation maximum possible, it is possible in the case of channel is good, continue height
Speed transmission, in the case of bad channel quality, low speed transmits repeatedly, reaches the highest channel as far as possible
Utilization rate.
Accompanying drawing explanation
Fig. 1 hardware connects figure
Fig. 2 software architecture diagram
Fig. 3 is controlled module piecemeal process
The bi-directionally sent flow chart of Fig. 4
Fig. 5 two-way reception flow chart
Fig. 6 speed adjusts flow chart
Specific implementation method
In order to make present disclosure be clearly understood, below according to instantiation and combine attached
The present invention is described in further detail by figure.
The hardware connection mode of the present invention is as it is shown in figure 1, computer is by serial server and arrowband
Radio station connects；Program operates in PC end, by serial server to radio station, arrowband.
The program structure of PC end as in figure 2 it is shown, middle control module is responsible for the control to whole system,
File reads in and file block processes as it is shown on figure 3,64K is one piece, less than one piece as one
Block processes；Blocks of files form is as follows:
Transmission block ID；File ID；Filename length；Filename；File size；Blocks of files
Serial number；Blocks of files length；File data
Communicating with socket between module, communications protocol format is as follows:
AA55；Data length；Receive ID；Send ID；Transport-type；Structure；
Structure is divided into data, instruction, state；
Data form is: data name；Data length；Data；
Instruction format is: instruction name；Command length；Instruction；
Status format is: Status Name；State length；State；
Communication protocol processing module is responsible for packing file framing, and frame structure is as follows:
Recipient ID；Sender ID；Block ID；Total bag number；Current Bale No.；Data；
After file block, determine the bag number sent first, then carry out fountain coding, every frame number
According to being 109 bytes before coding, after coding, 113 byte codes start after completing to send, transmission
Flow chart as shown in Figure 4, is sent by minimum speed limit, the data of a length of 30 seconds when sending first
Bag, waits the duties data message that receiving end returns.
Receive flow process as it is shown in figure 5, receiving terminal situation about this being received after finishing receiving first
Carry out adding up then send duties data to transmitting terminal, the structure of duties data is as follows, its
Middle parameter is received signal to noise ratio:
Recipient ID；Sender ID；Duties type；Duties serial number；Total bag number；Receive
Bag number；Parameter
Make a start and determine transmission next time according to the bag accuracy received and signal to noise ratio after receiving duties data
Speed and bag number, speed-regulating scheme is as shown in Figure 6.Bag accuracy is higher than 80% raising speed, is less than
50% reduction of speed, if the constant signal to noise ratio of speed is higher than 17 decibels, sends duration and expands three times greater.
Then proceed to send until whole file is sent completely.
Claims (2)
1. short wave communication transmitted in both directions mode based on fountain codes, it is characterised in that: utilize fountain
The application characteristic of the code check independence of code and the distribution of its large-scale data and reliable broadcast combines to be received
Side's state feedback carries out adaptive rate and plus-minus single traffic volume can be greatly improved transmission effect
Rate；
So-called fountain codes, refers to the transmitting terminal random coded of this coding, by k original packet
Generating any number of coding groups, source node is not knowing whether these packets are successfully connect
In the case of receipts, persistently send packet；As long as and receiving terminal receives k (1+ ε) individual coding groups
Random subset, i.e. receive one and obtain N less times greater than original k value, just general with height by decoding
Rate (relevant with ε) successfully recovers whole original packet；
Shortwave Communication System based on fountain codes is by middle control module, communication protocol processing module sum
Form according to link processing module；Wherein communication protocol processing module has codec unit, framing list
Unit and speed adjustment unit form；
Bidirectional transmission method is specific as follows:
Step one: middle control module reads in a file, file is carried out piecemeal process, less than one
Block processes according to one piece；One blocks of data is issued communication protocol processing module
Step 2: the blocks of data size subpackage according to the rules that communication protocol processing module will receive,
Obtaining total bag number N=D/S, D is the size of blocks of data, and S is the data volume often wrapped；
These packets are carried out certain redundancy by step 3: determine the number-of-packet sent first
Fountain coding；
Step 4: to often bag data add check bit sum package informatin, package informatin include transmitting terminal ID,
Recipient ID, block ID, bag sum and current Bale No. form frame data；
Step 5: by frame data to data link processes module, data link processes module will
The frame data received are sent to radio station, transmitting terminal arrowband according to the data form in radio station, arrowband, by
Data are launched by radio station in shortwave mode；
Step 6: after radio station, receiving terminal arrowband receives data, obtain every frame data by check bit
The most correct, this adds up bag accuracy and received signal to noise ratio composition duties information after finishing receiving；
Step 7: duties information packet is sent to radio station, arrowband of making a start by receiving terminal radio station；
Step 8: after radio station, arrowband of making a start receives duties information, obtains the decoding of duties information
The bag accuracy of secondary transmission and signal to noise ratio, as parameter to communication protocol processing module communication protocol
The speed adjustment unit of processing module；
Step 9: speed adjustment unit goes out transmission next time according to bag accuracy and the signal-to-noise ratio computation of last time
Bag number and transmission rate；
Step 10: repetition step 4 is to step 9, until radio station, receiving end arrowband receives enough numbers
Fountain codes decoding can be carried out according to bag；
Step 11: receiving terminal communication protocol processing module carries out fountain decoding, recovers passed number
It is believed that breath；
Step 12: successfully decoded, again sends duties information and sends to radio station of making a start, notice
This blocks of data is held to be sent completely；
Step 13: after transmitting terminal parses the duties information that blocks of data is sent completely, middle control mould
Next blocks of data is issued communication protocol processing module by block；Repetition step 2 is to step 13, directly
It is sent completely to all data blocks；
Step 14: stop immediately when transmitting terminal radio station receives the duties being sent completely sending, as
Really time-out has not received duties, then transmitting terminal radio station is restored after repeating to send three times automatically.
Short wave communication transmitted in both directions mode based on fountain codes the most according to claim 1,
It is characterized in that: in the hardware of this transmission means, computer is by serial server and radio station, arrowband
Connect；Program operates in computer end, by serial server to radio station, arrowband；
In the program structure of computer end, middle control module is responsible for the control to whole system, and file is read
Entering and process with file block, 64K is one piece, less than one piece as one piece of process；Blocks of files lattice
Formula is as follows:
Transmission block ID；File ID；Filename length；Filename；File size；Blocks of files
Serial number；Blocks of files length；File data
Communicating with socket between module, communications protocol format is as follows:
AA55；Data length；Receive ID；Send ID；Transport-type；Structure；
Structure is divided into data, instruction, state；
Data form is: data name；Data length；Data；
Instruction format is: instruction name；Command length；Instruction；
Status format is: Status Name；State length；State；
Communication protocol processing module is responsible for packing file framing, and frame structure is as follows:
Recipient ID；Sender ID；Block ID；Total bag number；Current Bale No.；Data；
After file block, determine the bag number sent first, then carry out fountain coding, every frame number
According to being 109 bytes before coding, after coding, 113 byte codes start after completing to send, by minimum
Speed sends, the packet of a length of 30 seconds when sending first, waits the duties number that receiving end returns
It is believed that breath；
The situation that this is received after finishing receiving first by receiving terminal carries out adding up and then sends duty
Business data are to transmitting terminal, and the structure of duties data is as follows, and wherein parameter is received signal to noise ratio:
Recipient ID；Sender ID；Duties type；Duties serial number；Total bag number；Receive
Bag number；Parameter；
Make a start and determine transmission next time according to the bag accuracy received and signal to noise ratio after receiving duties data
Speed and bag number, bag accuracy be higher than 80% raising speed, less than 50% reduction of speed, if speed is not
Change signal to noise ratio then sends duration and expands three times greater higher than 17 decibels；Then proceed to send until whole
Till file is sent completely.
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| CN201610500094.8A CN105959085B (en) | 2016-06-29 | 2016-06-29 | Short wave communication transmitted in both directions mode based on fountain codes |
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| CN201610500094.8A CN105959085B (en) | 2016-06-29 | 2016-06-29 | Short wave communication transmitted in both directions mode based on fountain codes |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947804A (en) * | 2017-12-14 | 2018-04-20 | 厦门理工学院 | A kind of interpretation method and its device of LT codes |
| CN110726809A (en) * | 2019-10-19 | 2020-01-24 | 北京工业大学 | Design method of high-reliability combustible gas state monitoring and alarming equipment |
| CN112702140A (en) * | 2019-10-23 | 2021-04-23 | 哈尔滨工业大学（深圳） | Encoding method and device based on analog fountain codes |
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| US20030218973A1 (en) * | 2002-05-24 | 2003-11-27 | Oprea Alexandru M. | System and method for data detection in wireless communication systems |
| CN101820586A (en) * | 2010-02-26 | 2010-09-01 | 清华大学 | Method for reliable broadcasting in wireless local area network |
| CN102164026A (en) * | 2011-05-20 | 2011-08-24 | 哈尔滨工业大学深圳研究生院 | Fountain code compiling method based on deep space communication environment |
| CN102170332A (en) * | 2011-05-18 | 2011-08-31 | 西安电子科技大学 | Opportunistic routing protocol data distributing method based on fountain code and network coding |
| CN104104727A (en) * | 2014-07-24 | 2014-10-15 | 中国传媒大学 | Raptor code based large file transmission method |
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2016
- 2016-06-29 CN CN201610500094.8A patent/CN105959085B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20030218973A1 (en) * | 2002-05-24 | 2003-11-27 | Oprea Alexandru M. | System and method for data detection in wireless communication systems |
| CN101820586A (en) * | 2010-02-26 | 2010-09-01 | 清华大学 | Method for reliable broadcasting in wireless local area network |
| CN102170332A (en) * | 2011-05-18 | 2011-08-31 | 西安电子科技大学 | Opportunistic routing protocol data distributing method based on fountain code and network coding |
| CN102164026A (en) * | 2011-05-20 | 2011-08-24 | 哈尔滨工业大学深圳研究生院 | Fountain code compiling method based on deep space communication environment |
| CN104104727A (en) * | 2014-07-24 | 2014-10-15 | 中国传媒大学 | Raptor code based large file transmission method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947804A (en) * | 2017-12-14 | 2018-04-20 | 厦门理工学院 | A kind of interpretation method and its device of LT codes |
| CN110726809A (en) * | 2019-10-19 | 2020-01-24 | 北京工业大学 | Design method of high-reliability combustible gas state monitoring and alarming equipment |
| CN112702140A (en) * | 2019-10-23 | 2021-04-23 | 哈尔滨工业大学（深圳） | Encoding method and device based on analog fountain codes |
| CN112702140B (en) * | 2019-10-23 | 2022-05-31 | 哈尔滨工业大学（深圳） | Encoding method and device based on analog fountain codes |
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