CN105959086A - FEC data transmission method and device based on WLAN physical frame - Google Patents
FEC data transmission method and device based on WLAN physical frame Download PDFInfo
- Publication number
- CN105959086A CN105959086A CN201610509769.5A CN201610509769A CN105959086A CN 105959086 A CN105959086 A CN 105959086A CN 201610509769 A CN201610509769 A CN 201610509769A CN 105959086 A CN105959086 A CN 105959086A
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- CN
- China
- Prior art keywords
- wlan
- raptor code
- physical frame
- data packets
- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Abstract
The invention relates to an FEC data transmission method and device based on a WLAN physical frame, and belongs to the field of data transmission methods and devices. The data transmission method comprises the following steps: S1, a coding step of the WLAN physical frame combined with a Raptor code; S2, a coding and sending step of the WLAN physical frame combined with the Raptor code; and S3, a coding and decoding step of the WLAN physical frame combined with the Raptor code. The device provided by the invention can adopt the existing transceiver chip conforming to a WLAN protocol, but does not use a single-frame or multi-frame ACK retransmission method in the WLAN protocol to prevent sudden frame loss, and adds cross-layer joint type forward error correction coding of the Raptor code to recover the lost frame, so that data transmission is achieved.
Description
Technical field
The invention belongs to data transmission method and device field, a kind of based on WLAN physical frame
FEC data transmission method and device.
Background technology
WLAN protocol bunch be International Power electronic engineering association (IEEE) be WLAN formulate
Standard, by confirming that character (Acknowledgement is called for short ACK) retransmits machine in WLAN protocol
System ensures the reliability that data are transmitted, and each or every family Frame send and the most successfully need to lean on
ACK confirms, if sending unsuccessful, uses retransmission scheme to ensure that Frame is not lost.This skill
Art is higher in signal to noise ratio and bursty interference less in the environment of can the most effectively work, but at letter
Road environment is poor and bursty interference ratio is in the case of more serious, owing to transmission and the ACK of ACK also deposit
Efficiency of transmission can be made to be substantially reduced in the case of losing, delay jitter increases.And in many specific fortune
With there is bigger problem in environment, the such as transmitting terminal interference ratio of data transmission is relatively big, receiving terminal
Disturb little in the case of, the ack msg LOF of passback is serious, can cause the transmission data of whole system
Rate declines.
Summary of the invention
In view of this, it is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of based on WLAN
The FEC data transmission method of physical frame and device, it is achieved data cross-layer forward error correction (FEC) are transmitted.
For realizing object above, the present invention adopts the following technical scheme that
A kind of FEC data transmission method based on WLAN physical frame, described FEC data transmission method
Step as follows:
S1, WLAN physical frame combines the coding step of Raptor code；
S2, WLAN physical frame combines the coding forwarding step of Raptor code；
S3, WLAN physical frame combines the coding and decoding step of Raptor code.
Further, in described step S1, WLAN physical frame combines the coded method of Raptor code and is:
S11, a WLAN physical frame carry the symbol of a Raptor code, each coding of Raptor code
WLAN physical frame frame length in packet is identical, i.e. the symbol lengths of Raptor code is identical, but each coding point
WLAN physical frame frame length between group does not retrains；
S12, calculate data stream to be sent needed for the symbol lengths of Raptor code and the total volume of Raptor
Code packet count.
Further, each coding groups includes multiple raw data packets and multiple redundant data packets.
Further, in described step S2, WLAN physical frame combines the coding sender of Raptor code
Method is:
The data stream of input is pressed the symbol lengths packet of Raptor code, described in a coding groups
Raw data packets and described redundant data packets are respectively charged into WLAN data district, first send WLAN data
The described raw data packets of district's encapsulation, then retransmits the described redundant data packets of WLAN data district encapsulation.
Further, in described step S3, WLAN physical frame combines the coding and decoding of Raptor code
Concrete grammar is as follows:
If obtaining complete described raw data packets, directly send；
If the described raw data packets quantity lost is less than or equal to described redundant data packets quantity, then continue
Decode after receiving whole described redundant data packets；
If the described raw data packets quantity lost is more than described redundant data packets quantity, then Raptor code
Data in present encoding packet decodes unsuccessfully, the raw data packets that is properly received of submission, subsequently under
The reception of one Raptor coding groups.
Further, the WLAN physical frame in each packet of Raptor code does not use ACK frame to carry out
Transmission confirms, directly decodes.
A kind of device realizing described FEC data transmission method based on WLAN physical frame, described device
Including transceiver based on WLAN protocol and coder based on Raptor code.
The present invention uses above technical scheme, at least possesses following beneficial effect:
The present invention combines Raptor code by WLAN physical frame, the key-course (MAC) of WLAN protocol
With physical layer (PHY), the single frames in WLAN protocol or multiframe ACK repeating method is not used to prevent
Only sudden frame losing, and recover loss by adding layer-span combined Raptor code forward error correction (FEC)
Frame, it is achieved data are transmitted；The present invention uses WLAN physical frame to combine Raptor code forward error correction (FEC)
Transmit and can improve efficiency of transmission relative to the retransmission mechanism using ACK, solve in data transmission procedure because sending out
Sending end interference ratio is relatively big and receiving terminal interference little in the case of the ack msg LOF serious problems of passback,
And then the problem causing whole system transmission data efficiency decline.
Accompanying drawing explanation
Fig. 1 is the flow chart of steps of a kind of FEC data transmission method based on WLAN physical frame of the present invention；
Fig. 2 is the device schematic diagram of present invention FEC based on WLAN physical frame data transmission.
In figure: 1, the device of FEC data based on WLAN physical frame transmission；101, based on WLAN
The transceiver of agreement；102, coder based on Raptor code.
Detailed description of the invention
Below by drawings and Examples, technical scheme is described in further detail.
As it is shown in figure 1, the present invention provides a kind of FEC data transmission method based on WLAN physical frame,
The step of described FEC data transmission method is as follows:
S1, WLAN physical frame combines the coding step of Raptor code；
S2, WLAN physical frame combines the coding forwarding step of Raptor code；
S3, WLAN physical frame combines the coding and decoding step of Raptor code.
Further, in described step S1, WLAN physical frame combines the coded method of Raptor code and is:
S11, a WLAN physical frame carry the symbol of a Raptor code, each coding of Raptor code
WLAN physical frame frame length in packet is identical, i.e. the symbol lengths of Raptor code is identical, but each coding point
WLAN physical frame frame length between group does not retrains；
S12, calculate data stream to be sent needed for the symbol lengths of Raptor code and the total volume of Raptor
Code packet count.
Further, each coding groups includes multiple raw data packets and multiple redundant data packets.
It is understood that can full recovery or portion in the event of data loss by redundant data packets
Divide and recover data.
Further, in described step S2, WLAN physical frame combines the coding sender of Raptor code
Method is:
The data stream of input is pressed the symbol lengths packet of Raptor code, described in a coding groups
Raw data packets and described redundant data packets are respectively charged into WLAN data district, first send WLAN data
The described raw data packets of district's encapsulation, then retransmits the described redundant data packets of WLAN data district encapsulation.
Further, in described step S3, WLAN physical frame combines the coding and decoding of Raptor code
Concrete grammar is as follows:
If obtaining complete described raw data packets, directly send；
If the described raw data packets quantity lost is less than or equal to described redundant data packets quantity, then continue
Decode after receiving whole described redundant data packets；
If the described raw data packets quantity lost is more than described redundant data packets quantity, then Raptor code
Data in present encoding packet decodes unsuccessfully, the raw data packets that is properly received of submission, subsequently under
The reception of one Raptor coding groups.
It is understood that the present invention combines Raptor code by WLAN physical frame, by adding cross-layer
United Raptor code forward error correction (FEC) recovers the Frame lost, it is achieved data are transmitted, this
Bright employing WLAN physical frame combines Raptor code forward error correction (FEC) transmission relative to the weight using ACK
Biography mechanism can improve efficiency of transmission.
Further, the WLAN physical frame in each packet of Raptor code does not use ACK frame to carry out
Transmission confirms, directly decodes.
It is understood that the present invention combines Raptor code, WLAN protocol by WLAN physical frame
Key-course (MAC) and physical layer (PHY), do not use the single frames in WLAN protocol or multiframe
ACK repeating method prevents sudden frame losing, and uses WLAN physical frame to combine Raptor code forward direction
This mode is transmitted in error correction (FEC) can solve the transmitting terminal interference ratio of data transmission relatively greatly, and receiving terminal is done
Disturb little in the case of, the ack msg LOF of passback is serious, and whole system can be caused to transmit data efficiency
The problem declined.
Further, the present invention provides a kind of and realizes FEC number based on WLAN physical frame of the present invention
According to the device 1 of transmission method, described device 1 include transceiver 101 based on WLAN protocol and based on
The coder 102 of Raptor code.
Above-described detailed description of the invention, is carried out the purpose of the present invention, technical scheme and beneficial effect
Further describe, be it should be understood that the foregoing is only the present invention detailed description of the invention and
, the protection domain being not intended to limit the present invention, all within the spirit and principles in the present invention, done
Any modification, equivalent substitution and improvement etc., should be included within the scope of the present invention.
Claims (7)
1. a FEC data transmission method based on WLAN physical frame, it is characterised in that: described
The step of FEC data transmission method is as follows:
S1, WLAN physical frame combines the coding step of Raptor code；
S2, WLAN physical frame combines the coding forwarding step of Raptor code；
S3, WLAN physical frame combines the coding and decoding step of Raptor code.
FEC data transmission method the most according to claim 1, it is characterised in that: described step
In S1, WLAN physical frame combines the coded method of Raptor code and is:
S11, a WLAN physical frame carry the symbol of a Raptor code, each coding of Raptor code
WLAN physical frame frame length in packet is identical, i.e. the symbol lengths of Raptor code is identical, but each coding point
WLAN physical frame frame length between group does not retrains；
S12, calculate data stream to be sent needed for the symbol lengths of Raptor code and the total volume of Raptor
Code packet count.
FEC data transmission method the most according to claim 2, it is characterised in that: each coding
Packet includes multiple raw data packets and multiple redundant data packets.
FEC data transmission method the most according to claim 3, it is characterised in that: described step
In S2, WLAN physical frame combines the code sending method of Raptor code and is:
The data stream of input is pressed the symbol lengths packet of Raptor code, described in a coding groups
Raw data packets and described redundant data packets are respectively charged into WLAN data district, first send WLAN data
The described raw data packets of district's encapsulation, then retransmits the described redundant data packets of WLAN data district encapsulation.
FEC data transmission method the most according to claim 4, it is characterised in that: described step
In S3, the concrete grammar of the coding and decoding that WLAN physical frame combines Raptor code is as follows:
If obtaining complete described raw data packets, directly send；
If the described raw data packets quantity lost is less than or equal to described redundant data packets quantity, then continue
Decode after receiving whole described redundant data packets；
If the described raw data packets quantity lost is more than described redundant data packets quantity, then Raptor code
Data in present encoding packet decodes unsuccessfully, the raw data packets that is properly received of submission, subsequently under
The reception of one Raptor coding groups.
FEC data transmission method the most according to claim 5, it is characterised in that: Raptor code
WLAN physical frame in each packet does not use ACK frame to be transmitted confirming, directly decodes.
7. one kind realizes the device of FEC data transmission method described in claim 1, it is characterised in that:
Described device includes transceiver based on WLAN protocol and coder based on Raptor code.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610509769.5A CN105959086B (en) | 2016-06-30 | 2016-06-30 | A kind of FEC data transmission method and device based on WLAN physical frame |
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| CN201610509769.5A CN105959086B (en) | 2016-06-30 | 2016-06-30 | A kind of FEC data transmission method and device based on WLAN physical frame |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090086638A1 (en) * | 2007-10-01 | 2009-04-02 | Samsung Electronics, Co., Ltd. | Method and system for wireless communication of data with a fragmentation pattern and low-density parity-check codes |
| CN103401649A (en) * | 2013-08-07 | 2013-11-20 | 清华大学 | Fountain code-based distributed transmission device and method under severe channels |
| CN103944689A (en) * | 2014-04-04 | 2014-07-23 | 浙江大学 | Flow line transmission method suitable for physical layer rateless coding transmission |
| CN103944674A (en) * | 2014-04-04 | 2014-07-23 | 浙江大学 | Data cutting and packaging method suitable for physical layer rateless code transmission |
-
2016
- 2016-06-30 CN CN201610509769.5A patent/CN105959086B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090086638A1 (en) * | 2007-10-01 | 2009-04-02 | Samsung Electronics, Co., Ltd. | Method and system for wireless communication of data with a fragmentation pattern and low-density parity-check codes |
| CN103401649A (en) * | 2013-08-07 | 2013-11-20 | 清华大学 | Fountain code-based distributed transmission device and method under severe channels |
| CN103944689A (en) * | 2014-04-04 | 2014-07-23 | 浙江大学 | Flow line transmission method suitable for physical layer rateless coding transmission |
| CN103944674A (en) * | 2014-04-04 | 2014-07-23 | 浙江大学 | Data cutting and packaging method suitable for physical layer rateless code transmission |
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