CN108847915B - Method for realizing unidirectional transmission by reconstructing source end data by applying error correction coding technology - Google Patents
Method for realizing unidirectional transmission by reconstructing source end data by applying error correction coding technology 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
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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
- H04L1/0041—Arrangements at the transmitter end
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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
- H04L1/0045—Arrangements at the receiver end
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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
- H04L1/0061—Error detection codes
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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
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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
Abstract
The invention provides a method for reconstructing source end data to realize unidirectional transmission by applying an error correction coding technology, which comprises the steps of sending data through a first channel, feeding back whether packet is lost or not through a second channel by a receiving end, detecting whether the second channel is occupied or not by the sending end to judge the condition that the receiving end receives the data, selectively realizing forward error correction coding of the data and realizing reconstruction of the source end data; the method realizes the selective error correction coding of the data to be transmitted by utilizing two channels, improves the data transmission efficiency, saves the bandwidth, and ensures the safety and confidentiality of data transmission because no handshake exists.
Description
Technical Field
The invention belongs to the technical field of data transmission, and particularly relates to a method for reconstructing source end data to realize unidirectional transmission by applying an error correction coding technology.
Background
In the field of information security, it is sometimes required that data can only be transmitted in one direction, for example, to ensure that data in a high-security-level network cannot flow to a low-security-level network, but data in the low-security-level network can flow to the high-security-level network, thereby avoiding a divulgence. In order to thoroughly solve the problem of information leakage of a high-density network, only a one-way transmission technology without feedback is adopted. The safety isolation and information one-way leading-in system adopts a unique one-way feedback-free transmission technology, and ensures absolute one-way flow of data from a physical link layer and a transmission layer.
The working principle of the unidirectional feedback-free transmission technology is similar to the characteristic of unidirectional conduction of a diode, data can be transmitted to an intranet host from the extranet host only by adopting a hardware architecture design, feedback signals in any form do not exist in the middle, and all communication protocols needing handshake confirmation lose significance in an information unidirectional transmission system.
Because no handshake confirmation information exists, how to ensure that the data of the source end is completely and accurately reconstructed at the receiving end is a key technology of the unidirectional transmission system. The safety isolation and information one-way leading-in system defines a private communication protocol to package and transmit data aiming at the one-way non-feedback environment, adopts a forward error correction coding technology and simultaneously adopts a plurality of speed and flow control methods, so that the modularized bottom layer communication interface can flexibly and reliably process the requirements of different services. The integrity, reliability and confidentiality of data transmission are ensured through the key technologies.
CN106506114A discloses a real-time streaming transmission system based on application layer forward error correction technology, and for example, CN107483144 discloses a forward error correction feedback information transmission method, etc., which all utilize forward error correction coding technology to implement unidirectional transmission of data. However, in order to ensure the reliability of data transmission in a channel, a transmitting end needs to perform forward error correction coding on data to be transmitted to generate a plurality of redundant packets, and then the redundant packets are transmitted to a receiving end, and the receiving end can automatically correct errors in transmission according to received code words and coding rules.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for reconstructing source end data by applying an error correction coding technology to realize unidirectional transmission.
The specific technical scheme of the invention is as follows:
the invention provides a method for reconstructing source end data to realize unidirectional transmission by applying an error correction coding technology, which comprises the following steps:
s1: a sending end divides data to be sent into n information data packets with equal information sequences;
s2: generating an error detection code for each information data packet according to an error correction coding technology, forming the information data packet and the error detection code into a coding packet, and numbering the coding packet to ensure that each coding packet has a unique number;
s3: the sending end sends the coding packet to the receiving end through a first channel every a preset time t;
s4: the receiving end caches the received encoded packet, performs error detection decoding on the encoded packet, and starts from the first decoded encoded packet, determines whether the received encoded packet has packet loss, if not, does not perform processing, and if so, performs step S5;
s5: the receiving end sends a data packet to the application layer through a second channel;
s6: the sending end detects whether the second channel is occupied from the moment of sending the first coding packet, if not, the step S3 is continued, if yes, forward error correction coding is carried out, a redundant packet is obtained and numbered for the redundant packet, and the redundant packet is sent to the receiving end, wherein the number comprises the number information of the coding packet;
s7: and after receiving the redundant packet, the receiving end performs forward error correction decoding to recover the lost information data, and reconstructs source end data and transmits the source end data to the application layer.
In a further improvement, the predetermined time t is greater than the time t for the receiving end to receive and decode a coded packet1。
In a further improvement, step S6 further includes: and judging whether the first channel is occupied at the current moment, and emptying the first channel if the first channel is occupied.
Further improvement, the specific method in step S5 is as follows:
s51: judging the sizes of the Hamming weights W and 1 in the detection decoding, and when W is 1, performing step S52, and when W is more than 1, performing step S53;
s52: the receiving end sends a null data packet to the application layer through a second channel;
s53: the receiving end continues t through the second channel1Time sends a null packet to the application layer.
Further improvement, the specific method in step S6 is as follows:
s61: the transmitting end detects whether the second channel is occupied from the moment of starting to transmit the first coded packet, if not, the step S3 is continued, and if the second channel is occupied, the step S62 is carried out;
s62: judging the time t of the second channel being occupied2If t is2＝t3Go to step S63, t3A time to transmit a null data packet for the second channel;
s63: judging whether the sent coded packet is the first coded packet or not, and if so, performing step S64;
s64: performing difference processing on the information sequence of the information data packet in the first encoded packet and the 0 information sequence with the same length to obtain a difference information sequence, performing reduction processing on the difference information sequence to form a reduced data packet, performing forward error correction encoding on the reduced data packet to obtain a redundant packet, and performing step S65;
s65: and numbering the redundant packets and sending the redundant packets to a receiving end, wherein the numbering comprises the numbering information of the coded packets.
In a further improvement, step S6 further includes:
s66: when the first coded packet is not determined in step S63, making a difference between the information data packet in the currently transmitted coded packet and the information data packet in the last transmitted coded packet to obtain a difference data packet, and determining whether the last transmitted coded packet is forward error correction coded, if not, performing step S67;
s67: judging whether the length L of the difference data packet is an even number, if not, using a 0 complementary bit at the tail part, then keeping the head part and the tail part of the difference data packet, carrying out difference processing on two adjacent information symbols from the second information symbol to obtain a reduced data packet, carrying out forward error correction coding on the reduced data packet to obtain a redundant packet, and carrying out step S65.
In a further improvement, step S6 further includes:
s68: when the coding is judged in step S67, forward error correction coding is performed on the difference packet to obtain a redundant packet, and step S65 is performed.
In a further improvement, step S6 further includes:
s69: when judged at step S622＝t1Then, forward error correction coding is performed on the information data packet in the transmitted coded packet to obtain a redundant packet, and step S65 is performed.
In a further improvement, step S3 includes:
s31: the first channel comprises a first sub-channel and a second sub-channel;
s32: the transmitting end adds a private protocol information packet header to a data packet to be distributed according to a channel, adds the private protocol information packet header to an encoding packet, and adds the private protocol information packet header to the encoding packet from t0Transmitting the 2n-1 coded packet to a receiving end through a first sub-channel at intervals of preset time t from the moment, and transmitting the coded packet from t to the receiving end through the first sub-channel0+tyStarts to alternate every predetermined time tyAnd sending the 2 nth coded packet to a receiving end through a second subchannel, wherein n is more than or equal to 1.
In a further refinement, t is set when the second channel is unoccupiedy＝t+t3When the second channel is occupied, t is sety＝t+t1。
The invention provides a method for reconstructing source end data to realize unidirectional transmission by applying an error correction coding technology, which realizes selective error correction coding of data to be transmitted by utilizing two channels, improves the data transmission efficiency, saves the bandwidth, and ensures the safety and confidentiality of data transmission because no handshake exists.
Drawings
Fig. 1 is a flowchart of a method for reconstructing source data by using error correction coding technology to implement unidirectional transmission in embodiment 1;
FIG. 2 is a flowchart of step S5 in example 3;
FIG. 3 is a flowchart of step S6 in example 4;
FIG. 4 is a flowchart of step S3 in example 5.
Detailed Description
Example 1
s1: a sending end divides data to be sent into n information data packets with equal information sequences;
s2: generating an error detection code for each information data packet according to an error correction coding technology, forming the information data packet and the error detection code into a coding packet, and numbering the coding packet to ensure that each coding packet has a unique number;
s3: the sending end sends the coding packet to the receiving end through a first channel every a preset time t;
s4: the receiving end caches the received encoded packet, performs error detection decoding on the encoded packet, and starts from the first decoded encoded packet, determines whether the received encoded packet has packet loss, if not, does not perform processing, and if so, performs step S5;
s5: the receiving end sends a data packet to the application layer through a second channel;
s6: the sending end detects whether the second channel is occupied from the moment of sending the first coding packet, if not, the step S3 is continued, if yes, forward error correction coding is carried out, a redundant packet is obtained and numbered for the redundant packet, and the redundant packet is sent to the receiving end, wherein the number comprises the number information of the coding packet;
s7: and after receiving the redundant packet, the receiving end performs forward error correction decoding to recover the lost information data, and reconstructs source end data and transmits the source end data to the application layer.
This invention provides a method for reconstructing source end data to realize one-way transmission by applying error correction coding technique, which first of all groups data are grouped, the information sequence in each group is m, then an error detection code is generated for each information data packet by ARQ error correction coding technique, but in the process of ARQ error correction coding technique, a receiving end does not send feedback information to the sending end, which sends information data packets to the receiving end at intervals, the receiving end needs to decode by detecting error every time it receives one code packet, if which code packet has packet loss, it sends data packets by a second channel, the receiving end detects the second timeThe invention is implemented by setting a preset time t to be greater than the time t for receiving and decoding a coding packet by the receiving end, and reconstructing source end data according to the serial number to realize the one-way transmission of the data1Therefore, which information data packet needs to be subjected to error correction processing can be determined; by the method, the redundancy of the data can be reduced, the transmission efficiency can be improved, and the bandwidth can be saved while the safe and reliable transmission of the data can be ensured.
Example 2
Embodiment 2 of the present invention provides a method for implementing unidirectional transmission by reconstructing source-end data using an error correction coding technique, which is basically the same as embodiment 1, except that step S6 further includes: and judging whether the first channel is occupied at the current moment, and emptying the first channel if the first channel is occupied. When the second channel is found to be occupied, whether the first channel is occupied or not is further judged, and if the first channel is occupied, the first channel is emptied, so that the transmission efficiency of the redundant packet is ensured.
Example 3
Embodiment 3 of the present invention provides a method for reconstructing source data to implement unidirectional transmission by applying an error correction coding technique, which is basically the same as that in embodiment 1, except that, as shown in fig. 2, the specific method in step S5 is as follows:
s51: judging the sizes of the Hamming weights W and 1 in the detection decoding, and when W is 1, performing step S52, and when W is more than 1, performing step S53;
s52: the receiving end sends a null data packet to the application layer through a second channel;
s53: the receiving end continues t through the second channel1Time sends a null packet to the application layer.
The present invention further defines step S5, wherein the Hamming weight is the number of random errors that occurred; the invention judges the number of the data packets sent through the second channel according to the number of the random errors, thereby providing a basis for the subsequent selection of the coding technology, saving the redundancy of the coded data and simultaneously ensuring the integrity of data transmission.
Example 4
Embodiment 4 of the present invention provides a method for reconstructing source data to implement unidirectional transmission by applying an error correction coding technique, which is basically the same as embodiment 3, except that, as shown in fig. 3, the specific method in step S6 is:
s61: the transmitting end detects whether the second channel is occupied from the moment of starting to transmit the first coded packet, if not, the step S3 is continued, and if the second channel is occupied, the step S62 is carried out;
s62: judging the time t of the second channel being occupied2If t is2＝t3Go to step S63, t3A time to transmit a null data packet for the second channel;
s63: judging whether the sent coded packet is the first coded packet or not, and if so, performing step S64;
s64: performing difference processing on the information sequence of the information data packet in the first encoded packet and the 0 information sequence with the same length to obtain a difference information sequence, performing reduction processing on the difference information sequence to form a reduced data packet, performing forward error correction encoding on the reduced data packet to obtain a redundant packet, and performing step S65;
s65: numbering the redundant packets and sending the redundant packets to a receiving end, wherein the numbering comprises the numbering information of the coded packets;
s66: when the first coded packet is not determined in step S63, making a difference between the information data packet in the currently transmitted coded packet and the information data packet in the last transmitted coded packet to obtain a difference data packet, and determining whether the last transmitted coded packet is forward error correction coded, if not, performing step S67;
s67: judging whether the length L of the difference data packet is an even number, if not, using a 0 complementary bit at the tail part, then reserving the head part and the tail part of the difference data packet, carrying out difference processing on two adjacent information symbols from the second information symbol to obtain a reduced data packet, carrying out forward error correction coding on the reduced data packet to obtain a redundant packet, and carrying out step S65;
s68: when the step S67 judges to perform coding, forward error correction coding is performed on the difference data packet to obtain a redundant packet, and the step S65 is performed;
s69: when judged at step S622＝t1Then, forward error correction coding is performed on the information data packet in the transmitted coded packet to obtain a redundant packet, and step S65 is performed.
In the indentation processing of step S64, the adjacent and same information symbol is set to 1, for example, the information sequence 000101110 is reduced to 01010. Step S67 is specifically an information sequence 011100001, which has 9 information sequences, and the complement bit is 0, and the obtained reduced data packet information sequence is 001010.
The invention further limits the step S6, and judges and selects the coding technology according to the occupied time of the second channel, thereby not only ensuring the complete transmission of the data, but also greatly saving the bandwidth, reducing the redundancy of the data and obviously improving the efficiency of the data transmission.
Example 5
Embodiment 5 of the present invention provides a method for reconstructing source data to implement unidirectional transmission by applying an error correction coding technique, which is basically the same as that in embodiment 4, except that, as shown in fig. 4, step S3 includes:
s31: the first channel comprises a first sub-channel and a second sub-channel;
s32: the transmitting end adds a private protocol information packet header to a data packet to be distributed according to a channel, adds the private protocol information packet header to an encoding packet, and adds the private protocol information packet header to the encoding packet from t0Transmitting the 2n-1 coded packet to a receiving end through a first sub-channel at intervals of preset time t from the moment, and transmitting the coded packet from t to the receiving end through the first sub-channel0+tyStarts to alternate every predetermined time tySending the 2 nth coded packet to a receiving end through a second sub-channel, wherein n is more than or equal to 1, and when the second channel is not occupied, setting ty＝t+t3When the second channel is occupied, t is sety＝t+t1。
The invention realizes the data transmission through double channels, can reduce the delay and the jitter of the data and improve the transmission efficiency.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.
Claims (8)
1. A method for reconstructing source data to realize unidirectional transmission by applying error correction coding technology is characterized by comprising the following steps:
s1: a sending end divides data to be sent into n information data packets with equal information sequences;
s2: generating an error detection code for each information data packet according to an error correction coding technology, forming the information data packet and the error detection code into a coding packet, and numbering the coding packet to ensure that each coding packet has a unique number;
s3: the sending end sends the coded packets to the receiving end through a first channel every preset time t, wherein the preset time t is greater than the time t for the receiving end to receive and decode one coded packet1；
S4: the receiving end caches the received encoded packet, performs error detection decoding on the encoded packet, and starts from the first decoded encoded packet, determines whether the received encoded packet has packet loss, if not, does not perform processing, and if so, performs step S5;
s5: the receiving end sends a data packet to the application layer through a second channel;
s6: the sending end detects whether the second channel is occupied from the moment when the first coding packet is sent, if not, the step S3 is continued, if yes, forward error correction coding is carried out, a redundant packet is obtained and numbered for the redundant packet, and the redundant packet is sent to the receiving end, wherein the number comprises the number information of the coding packet;
s7: and after receiving the redundant packet, the receiving end performs forward error correction decoding to recover the lost information data, and reconstructs source end data and transmits the source end data to the application layer.
2. The method for reconstructing source data to achieve unidirectional transmission by applying error correction coding technique as claimed in claim 1, wherein step S6 further includes: and judging whether the first channel is occupied at the current moment, and emptying the first channel if the first channel is occupied.
3. The method for reconstructing source data to implement unidirectional transmission by applying error correction coding technique as claimed in claim 1, wherein the step S5 specifically comprises:
s51: judging the Hamming weight W and 1 in the decoding, and if W is 1, proceeding the step
S52, when W is more than 1, executing step S53;
s52: the receiving end sends a null data packet to the application layer through a second channel;
s53: the receiving end continues t through the second channel1Time sends a null packet to the application layer.
4. The method for reconstructing source data to implement unidirectional transmission by applying error correction coding technique as claimed in claim 1, wherein the step S6 specifically comprises:
s61: the transmitting end detects whether the second channel is occupied from the moment of starting to transmit the first coded packet, if not, the step S3 is continued, and if the second channel is occupied, the step S62 is carried out;
s62: judging the time t of the second channel being occupied2If t is2＝t3Go to step S63, t3A time to transmit a null data packet for the second channel;
s63: judging whether the sent coded packet is the first coded packet or not, and if so, performing step S64;
s64: performing difference processing on the information sequence of the information data packet in the first encoded packet and the 0 information sequence with the same length to obtain a difference information sequence, performing reduction processing on the difference information sequence to form a reduced data packet, performing forward error correction encoding on the reduced data packet to obtain a redundant packet, and performing step S65;
s65: and numbering the redundant packets and sending the redundant packets to a receiving end, wherein the numbering comprises the numbering information of the coded packets.
5. The method for reconstructing source data to achieve unidirectional transmission by applying error correction coding technique as claimed in claim 1, wherein step S6 further includes:
s66: when the first coded packet is not determined in step S63, making a difference between the information data packet in the currently transmitted coded packet and the information data packet in the last transmitted coded packet to obtain a difference data packet, and determining whether the last transmitted coded packet is forward error correction coded, if not, performing step S67;
s67: judging whether the length L of the difference data packet is an even number, if not, using a 0 complementary bit at the tail part, then keeping the head part and the tail part of the difference data packet, carrying out difference processing on two adjacent information symbols from the second information symbol to obtain a reduced data packet, carrying out forward error correction coding on the reduced data packet to obtain a redundant packet, and carrying out step S65.
6. The method of claim 5, wherein the step S6 further includes:
s68: when the coding is judged in step S67, forward error correction coding is performed on the difference packet to obtain a redundant packet, and step S65 is performed.
7. The method of claim 6, wherein the step S6 further includes:
s69: when judged at step S622＝t1Then, forward error correction coding is performed on the information data packet in the transmitted coded packet to obtain a redundant packet, and step S65 is performed.
8. The method of claim 7, wherein the step S3 includes:
s31: the first channel comprises a first sub-channel and a second sub-channel;
s32: the transmitting end adds a private protocol information packet header to a data packet to be distributed according to a channel, adds the private protocol information packet header to an encoding packet, and adds the private protocol information packet header to the encoding packet from t0Transmitting the 2n-1 coded packet to a receiving end through a first sub-channel at intervals of preset time t from the moment, and transmitting the coded packet from t to the receiving end through the first sub-channel0+tyStarts to alternate every predetermined time tySending the 2 nth coded packet to a receiving end through a second sub-channel, wherein n is more than or equal to 1, and when the second channel is not occupied, setting ty＝t+t3When the second channel is occupied, t is sety＝t+t1。
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