CN105959085B - Short wave communication transmitted in both directions mode based on fountain codes - Google Patents
Short wave communication transmitted in both directions mode based on fountain codes Download PDFInfo
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- CN105959085B CN105959085B CN201610500094.8A CN201610500094A CN105959085B CN 105959085 B CN105959085 B CN 105959085B CN 201610500094 A CN201610500094 A CN 201610500094A CN 105959085 B CN105959085 B CN 105959085B
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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
Abstract
The invention discloses the short wave communication transmitted in both directions modes based on fountain codes, it is a kind of HF Wireless Communication data transfer mode, it is unstable especially for wireless transmission channel, a kind of transmission mode that insecure situation is formulated is transmitted, the correlative technology fields such as short-wave radio set wireless communication system, data encoding and decoding are belonged to.It is made of based on the Shortwave Communication System of fountain codes middle control module, communication protocol processes module and data link processes module.Wherein communication protocol processes module is made of codec unit, Framing unit and speed adjustment unit.Transmitting efficiency can be greatly improved by carrying out adaptive rate and plus-minus single traffic volume using the code rate independence of fountain codes and the distribution of its large-scale data and application characteristic combination debit's state feedback of reliable broadcast.
Description
Technical field
It is unstable especially for wireless transmission channel the present invention relates to a kind of HF Wireless Communication data transfer mode,
A kind of transmission mode that insecure situation is formulated is transmitted, the correlations such as short-wave radio set wireless communication system, data encoding and decoding are belonged to
Technical field.
Background technique
Shortwave refer to wavelength between 100m~10m, electromagnetic wave of the frequency in 3MHz~30MHz.Short wave communication be by
A kind of communication mode that shortwave is realized.Short wave communication reaches receiving device, Ke Yishi through the reflection in ionosphere by emitting radio waves
Existing longer-distance wireless communication, is the main means of telecommunication.Although new communication continues to bring out, shortwave
It communicates the ancient and traditional communication mode of this one kind not to be eliminated not only by its natural advantage, nevertheless suffer from instead complete
The most attention in the world, in continuous quickly more new development.Because it has the advantages of other communication systems do not have.Firstly,
Shortwave is unique not telecommunication means by network pivot button and active relaying system about, various in case of war or disaster
Communication system all may be destroyed or be attacked, including cellular base station, telephone line, satellite system etc., once relay system
It is destroyed, directly affects the wireless communication of whole region, cause unpredictable loss.No matter which kind of communication mode,
Its capability to resist destruction and autonomous communication ability can not all match in excellence or beauty with shortwave.Secondly, in areas such as mountain area, gobi, oceans, relay base station
It does not cover, relies primarily on shortwave and satellite realizes telecommunication, shortwave does not have to payment services expense compared with satellite communication
With operating cost is low.Since the communication distance of shortwave is remote, equipment is easy to carry, becomes main military communication mode.It is short
The form of program request and broadcast is mostly used in wave communication, is suitble to plurality of application scenes, has higher practical value, for example higher level is under
Grade each department issues the documents, and information collection passback or the condition of a disaster or war report and commander battlefield etc. all embody short wave communication
Important use.
Since short wave communication is wireless communication, what the reliability of transmission was even more important.Short wave communication emitting radio waves will be through electricity
The reflection of absciss layer gets to receiving device, but the height in ionosphere and density be easy by round the clock, season, the factors such as weather shadow
It rings, proposes many schemes, such as adaptive technique, sudden transmission technology, Digital Signal Processing skill in face of this phenomenon forefathers
Art, error-control technique, spread spectrum etc..But it in addition to this can also be very in terms of the encoding and decoding of shortwave data and transmission mode
The raising efficiency of transmission of big degree, avoids the wasting of resources.All the time in order to which complete transmission file is all using multiple after coding
The mode of repeating transmission can receive file complete content to guarantee opposite end, but transmission time in this way is long, and low efficiency is difficult quickly to receive
Fat file.And receiving-transmitting sides transmit specific situation to file and are all difficult to hold, so a kind of quick, reliable transmission mode pole
It is important.
Summary of the invention
Low based on now existing transmitting efficiency and transmission state is difficult to the problem of holding, the present invention proposes a kind of based on fountain
The bidirectional data transmission method of code coding and adaptive frequency hopping, 300bit/s to 2.4kbit/s is adaptively passed in shortwave narrowband
It is defeated.It is returned using application characteristic combination debit's state of the code rate independence of fountain codes and the distribution of its large-scale data and reliable broadcast
Transmitting efficiency can be greatly improved in feed row adaptive rate and plus-minus single traffic volume.
So-called fountain codes refer to the transmitting terminal random coded of this coding, generate any number of volume by k original packet
Code grouping, source node persistently send data packet in the case where not knowing whether these data packets are successfully received.And receiving end
As long as receiving the random subset of k (1+ ε) a coding groups, that is, receiving one is worth N less times greater than original k, so that it may pass through decoding
Successfully restore whole original packets with high probability (related with ε).
Based on the Shortwave Communication System of fountain codes by middle control module, communication protocol processes module and data link processes module
Composition.Wherein communication protocol processes module is made of codec unit, Framing unit and speed adjustment unit.
Bidirectional transmission method is specific as follows:
Step 1: middle control module reads in a file, and file is carried out piecemeal processing, is located less than one piece according to one piece
Reason.One block number evidence is issued into communication protocol processes module
Step 2: the block number received according to according to regulation size subpackage, is found out total packet number N=by communication protocol processes module
D/S, D are the size of block number evidence, and S is the data volume of every packet.
Step 3: it determines the number-of-packet sent for the first time, these data packets is carried out with the fountain coding of certain redundancy.
Step 4: to every bag data be added check bit sum package informatin, package informatin include transmitting terminal ID, recipient ID, block ID,
Packet sum and current Bale No. form a frame data.
Step 5: a frame data are given to data link processes module, the frame data that data link processes module will receive
It is sent to transmitting terminal narrowband radio station according to the data format in narrowband radio station, is launched data in a manner of shortwave by radio station.
Step 6: after narrowband radio station in receiving end receives data, obtain whether every frame data are correct, this connects by check bit
Statistics packet accuracy and received signal to noise ratio form duties information after the completion of receiving.
Step 7: duties information packet is sent to originator narrowband radio station by receiving end radio station.
Step 8: after originator narrowband radio station receives duties information, it is correct that the packet that acquisition last time sends is decoded to duties information
Rate and signal-to-noise ratio, as parameter to the speed adjustment unit of communication protocol processes module communication protocol processing module.
Step 9: speed adjustment unit goes out the packet number and send speed that next time sends according to the packet accuracy and signal-to-noise ratio computation of last time
Rate.
Step 10: step 4 is repeated to step 9, can be sprayed until receiving end narrowband radio station receives enough data packets
Spring code decoding.
Step 11: receiving end communication protocol processes module carries out fountain decoding, restores passed data information.
Step 12: the successfully decoded duties information that then sends again gives originator radio station, notifies this block number of transmitting terminal according to transmission
It completes.
Step 13: transmitting terminal parses block number according to after the duties information that is sent completely, and middle control module is by next block number evidence
Issue communication protocol processes module.Step 2 is repeated to step 13, until all data blocks are sent completely.
Step 14: transmitting terminal radio station stops sending immediately when receiving the duties being sent completely, if time-out does not receive
Duties are completed, then transmitting terminal radio station repeats automatic after sending three times restore.
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 is compared to original single using fountain codes or other are two-way
Transmission mode is a kind of new mode, and the intercommunity of the randomness of fountain codes coding and two-way communication is combined, can more preferably be fitted
For in the relatively unstable shortwave transmission process of channel, speed-regulating scheme proposed in this paper to can be good at combining shortwave bandwidth feelings
Condition can continue high-speed transfer, letter in the good situation of channel for the transmission data of short wave channel situation maximum possible
Low speed transmits repeatedly in the ropy situation in road, reaches highest channel utilization as far as possible.
Detailed description of the invention
Fig. 1 hardware connection figure
Fig. 2 software architecture diagram
The processing of module piecemeal is controlled in Fig. 3
The bi-directionally sent flow chart of Fig. 4
The two-way reception flow chart of Fig. 5
Fig. 6 speed adjust flow chart
Specific implementation method
In order to be clearly understood the contents of the present invention, below according to specific example and in conjunction with attached drawing to the present invention make into
One step is described in detail.
Hardware connection mode of the invention is as shown in Figure 1, computer is connect by serial server with narrowband radio station；Program fortune
Row gives narrowband radio station by serial server at the end PC.
The program structure at the end PC is as shown in Fig. 2, middle control module is responsible for the control to whole system, and file is read in and file point
Block processing is as shown in figure 3,64K is one piece, less than one piece as one piece of processing；File block format is as follows:
Transmission block ID；File ID；Filename length；Filename；File size；Blocks of files sequence number；File block length；Text
Number of packages evidence
It is communicated between module with socket, communications protocol format is as follows:
AA55；Data length；Receive ID；Send ID；Transport-type；Structure；
Structure is divided into data, instruction, state；
Data format are as follows: data name；Data length；Data；
Instruction format are as follows: instruction name；Command length；Instruction；
Status format are as follows: Status Name；State length；State；
Communication protocol processes module is responsible for for file being packaged framing, and frame structure is as follows:
Recipient ID；Sender ID；Block ID；Total packet number；Current Bale No.；Data；
After file block, the packet number sent for the first time is determined, then carry out fountain coding, be 109 words before every frame data coding
It saves, starts to send after the completion of 113 byte codes after coding, the flow chart of transmission by minimum speed limit as shown in figure 4, sent, for the first time
A length of 30 seconds data packets when transmission, the duties data information for waiting receiving end to return.
Process is received as shown in figure 5, the case where receiving end receives this after finishing receiving for the first time count then hair
Send duties data to transmitting terminal, 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 packet number；The packet number received；Parameter
Starting after receiving duties data, packet accuracy and signal-to-noise ratio determine the rate and packet number that next time sends based on the received,
Speed-regulating scheme is as shown in Figure 6.Packet accuracy is higher than 80% raising speed, is lower than 50% reduction of speed, if the constant signal-to-noise ratio of rate is higher than 17
Decibel then sends duration and expands three times.It then proceedes to send until entire file is sent completely.
Claims (1)
1. the short wave communication transmitted in both directions mode based on fountain codes, it is characterised in that: utilize the code rate independence of fountain codes and its
Large-scale data distribution and application characteristic combination debit's state feedback of reliable broadcast carry out adaptive rate and plus-minus single hair
Transmitting efficiency can be greatly improved in the amount of sending；
So-called fountain codes refer to the transmitting terminal random coded of this coding, generate any number of coding point by k original packet
Group, source node persistently send data packet in the case where not knowing whether these data packets are successfully received；As long as and receiving end
Receive the random subset of k (1+ ε) a coding groups, as soon as receiving less times greater than original k is worth N, by decoding with it is high generally
Rate successfully restores whole original packets；
Based on the Shortwave Communication System of fountain codes by middle control module, communication protocol processes module and data link processes module group
At；Wherein communication protocol processes module is made of codec unit, Framing unit and speed adjustment unit；
Bidirectional transmission method is specific as follows:
Step 1: middle control module reads in a file, and file is carried out piecemeal processing, is handled less than one piece according to one piece；It will
One block number evidence issues communication protocol processes module；
Step 2: the block number received according to according to regulation size subpackage, is found out total packet number N=D/S by communication protocol processes module,
D is the size of block number evidence, and S is the data volume of every packet；
Step 3: determining the number-of-packet sent for the first time, these data packets are carried out with the fountain coding of redundancy；
Step 4: check bit sum package informatin is added to every bag data, package informatin includes transmitting terminal ID, recipient ID, block ID, wraps always
Several and current Bale No. forms a frame data；
Step 5: giving a frame data to data link processes module, data link processes module by the frame data received according to
The data format in narrowband radio station is sent to transmitting terminal narrowband radio station, is launched data in a manner of shortwave by radio station；
Step 6: after narrowband radio station in receiving end receives data, obtain whether every frame data are correct, this has been received by check bit
Duties information is formed at rear statistics packet accuracy and received signal to noise ratio；
Step 7: duties information packet is sent to originator narrowband radio station by receiving end radio station；
Step 8: originator narrowband radio station receive duties information after, to duties information decode obtain last time send packet accuracy and
Signal-to-noise ratio, as parameter to the speed adjustment unit of communication protocol processes module communication protocol processing module；
Step 9: speed adjustment unit goes out the packet number and transmission rate that next time sends according to the packet accuracy and signal-to-noise ratio computation of last time；
Step 10: step 4 is repeated to step 9, can carry out fountain codes until receiving end narrowband radio station receives enough data packets
Decoding；
Step 11: receiving end communication protocol processes module carries out fountain decoding, restores passed data information；
Step 12: the successfully decoded duties information that then sends again gives originator radio station, and notice this block number of transmitting terminal evidence is sent completely；
Step 13: after transmitting terminal parses block number according to the duties information being sent completely, middle control module issues next block number evidence
Communication protocol processes module；Step 2 is repeated to step 13, until all data blocks are sent completely；
Step 14: transmitting terminal radio station stops sending immediately when receiving the duties being sent completely, if time-out does not receive completion
Duties, then transmitting terminal radio station repeats automatic after sending three times restore；
In the hardware of this transmission mode, computer is connect by serial server with narrowband radio station；Program operates in computer end, passes through
Serial server gives narrowband radio station；
In the program structure of computer end, middle control module is responsible for the control to whole system, and file is read in and file block processing,
64K is one piece, less than one piece as one piece of processing；File block format is as follows:
Transmission block ID；File ID；Filename length；Filename；File size；Blocks of files sequence number；File block length；Number of files
According to
It is communicated between module with socket, communications protocol format is as follows:
AA55；Data length；Receive ID；Send ID；Transport-type；Structure；
Structure is divided into data, instruction, state；
Data format are as follows: data name；Data length；Data；
Instruction format are as follows: instruction name；Command length；Instruction；
Status format are as follows: Status Name；State length；State；
Communication protocol processes module is responsible for for file being packaged framing, and frame structure is as follows:
Recipient ID；Sender ID；Block ID；Total packet number；Current Bale No.；Data；
After file block, the packet number sent for the first time is determined, then carry out fountain coding, be 109 bytes before every frame data coding, compile
Start to send after the completion of 113 byte codes after code, be sent by minimum speed limit, a length of 30 seconds data packets when sending for the first time wait
The duties data information that receiving end returns；
Then the case where receiving end receives this after finishing receiving for the first time, which count, sends duties data to transmitting terminal, duties
The structure of data is as follows, and wherein parameter is received signal to noise ratio:
Recipient ID；Sender ID；Duties type；Duties serial number；Total packet number；The packet number received；Parameter；
Starting after receiving duties data, packet accuracy and signal-to-noise ratio determine the rate and packet number that next time sends, Bao Zheng based on the received
True rate is higher than 80% raising speed, is lower than 50% reduction of speed, sends duration if the constant signal-to-noise ratio of rate is higher than 17 decibels and expands three times；
It then proceedes to send until entire file is sent completely.
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| 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 |
| 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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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7327800B2 (en) * | 2002-05-24 | 2008-02-05 | Vecima Networks Inc. | System and method for data detection in wireless communication systems |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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