CN107017968A - A kind of protocol type detection method of Wi Fi signals - Google Patents
A kind of protocol type detection method of Wi Fi signals Download PDFInfo
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- CN107017968A CN107017968A CN201710147454.5A CN201710147454A CN107017968A CN 107017968 A CN107017968 A CN 107017968A CN 201710147454 A CN201710147454 A CN 201710147454A CN 107017968 A CN107017968 A CN 107017968A
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- protocol type
- constellation point
- sig fields
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- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 238000013507 mapping Methods 0.000 claims abstract description 17
- 230000001360 synchronised effect Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- 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
- H04L1/0047—Decoding adapted to other signal detection operation
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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
- H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/345—Modifications of the signal space to allow the transmission of additional information
- H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
- H04L27/3483—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel using a modulation of the constellation points
Abstract
The invention discloses a kind of protocol type detection method of Wi Fi signals, comprise the following steps：When receiving a frame Wi Fi signals, synchronized on primary band with the signal of minimum bandwidth threshold value, and the L SIG fields of decoded signal；According to the constellation point mapping mode of 2 symbols behind L SIG fields after the value in RATE domains in L SIG fields after decoding, and decoding, the protocol type of Wi Fi signals is determined.When the protocol type of Wi Fi signals is IEEE802.11n/ac, by reading the HT SIGNAL information in VHT SIG A information and 802.11n frame heads in 802.11ac frame heads, the bandwidth of Wi Fi signals is judged.This method efficiently can promptly recognize the protocol type and bandwidth of Wi Fi signals, and be demodulated and decode according to actual bandwidth rapidly when Wi Fi equipment is receiving a frame Wi Fi signals.
Description
Technical field
The present invention relates to a kind of protocol type detection method of Wi-Fi signal, belong to wireless communication technology field.
Background technology
With the fast development of the communications industry, communication protocol and technical progress are rapid, IEEE802.11 series wireless locals
Net is also always in continuous evolution.The 5th generation agreement has been developed into from initial first generation IEEE802.11b agreements
IEEE802.11ac。
Traditional IEEE802.11a/g agreements using fixed 20MHz bandwidth, and the IEEE802.11n of newest issue and
IEEE802.11ac agreements support various bandwidth, and such as IEEE802.11n supports 20MHz, 40MHz bandwidth (referring to Fig. 1),
IEEE802.11ac supports 20MHz, 40MHz, 80MHz, 160MHz bandwidth (referring to Fig. 2), and different bandwidth correspond to different
The parameters such as subcarrier maps, transmission rate.
IEEE802.11 agreements are provided, for the equipment of support IEEE802.11ac agreements, it is necessary to compatible
IEEE802.11a/g/n, and need to be used for quickly detecting bandwidth used in IEEE802.11ac/n frames.Due to different agreement
Under type and different bandwidth, difference is distributed with subcarrier in frame structure, therefore, in the receiving terminal of Wi-Fi equipment, it is necessary to true first
After frame type and bandwidth, follow-up processing can be just carried out.Therefore, the protocol type of Wi-Fi signal is rapidly and accurately determined
And bandwidth, the reception processing for Wi-Fi signal has great importance.
The method of conventional detection Wi-Fi signal bandwidth is the spectrum energy by directly detecting Wi-Fi signal, estimates it
Amount of bandwidth, then carries out fine detection again.Either estimated in signal synchronous phase, fine inspection is then carried out again
Survey.Both approaches complex steps and accuracy is relatively low.
One kind is disclosed in the Chinese patent application of Application No. 201110072089.9 by changing modulation constellation
Method and apparatus to show information, can be by changing such as tune of two-phase PSK (BPSK) planisphere in signal field
The phase of planisphere processed distinguishes different types of packet configuration.Receiving device can identify whether the packet associated with transmitting
The type of structure, or it is the phase institute by the modulation constellation for mapping the signal field to identify whether the signal field
Present.In one embodiment of the patent application, the phase of modulation constellation can by Fast Fourier Transform (FFT) it
The energy of I and Q component is checked afterwards to determine.
But, in the frame structure by detecting Wi-Fi signal VHT-SIG-A or HT-SIGNAL information come detect Wi-Fi believe
Number agreement and bandwidth, do not relate in the prior art.
The content of the invention
In view of the shortcomings of the prior art, the technical problems to be solved by the invention are to provide a kind of association of Wi-Fi signal
Discuss type detection method.
For achieving the above object, the present invention uses following technical schemes：
A kind of protocol type detection method of Wi-Fi signal, comprises the following steps：
When receiving a frame Wi-Fi signal, synchronized on primary band with the signal of minimum bandwidth threshold value, and decode
The L-SIG fields of Wi-Fi signal；
According to the star of 2 symbols behind L-SIG fields after the value in RATE domains in L-SIG fields after decoding, and decoding
Seat point mapping mode, determines the protocol type of Wi-Fi signal.
Wherein more preferably, when the value in the RATE domains in L-SIG fields after decoding is not ' when 1101 ', it is determined that Wi-
The protocol type of Fi signals is IEEE802.11a/g.
Wherein more preferably, when the value in the RATE domains in L-SIG fields after decoding is ' when 1101 ', by decoding
Afterwards behind L-SIG fields the constellation point mapping mode of 2 symbols judgement, determine the protocol type of Wi-Fi signal.
Wherein more preferably, it is described by the constellation point mapping modes of 2 symbols is sentenced behind L-SIG fields after decoding
It is disconnected, the protocol type of Wi-Fi signal is determined, is comprised the following steps：
Judge the position of the constellation point modulation of 2 symbols behind L-SIG fields；If the constellation point of 2 symbols is adjusted
System is on I axles, then the protocol type of Wi-Fi signal is the IEEE802.11a/g of 20MHz bandwidth.
Wherein more preferably, it is described by the constellation point mapping modes of 2 symbols is sentenced behind L-SIG fields after decoding
It is disconnected, the protocol type of Wi-Fi signal is determined, is also comprised the following steps：
The position of the constellation point modulation of 2 symbols behind L-SIG fields is judged, if the constellation point of 2 symbols is adjusted
System is on Q axles, it is determined that the protocol type of Wi-Fi signal is IEEE802.11n.
Wherein more preferably, it is described by the constellation point mapping modes of 2 symbols is sentenced behind L-SIG fields after decoding
It is disconnected, the protocol type of Wi-Fi signal is determined, is also comprised the following steps：
Judge the position of the constellation point modulation of 2 symbols behind L-SIG fields, if in the constellation point of 2 symbols,
The constellation point of first symbol is modulated on I axles and the constellation point of second symbol is modulated on Q axles, it is determined that Wi-Fi believes
Number protocol type be IEEE802.11ac.
Wherein more preferably, it is described by the constellation point mapping modes of 2 symbols is sentenced behind L-SIG fields after decoding
It is disconnected, the protocol type of Wi-Fi signal is determined, is also comprised the following steps：
Judge the position of the constellation point modulation of 2 symbols behind L-SIG fields, if in the constellation point of 2 symbols,
The constellation point of first symbol is modulated on Q axles, the constellation point of second symbol is modulated on I axles, then abandons a frame of reception
Wi-Fi signal.
Wherein more preferably, the protocol type detection method of the Wi-Fi signal, also comprises the following steps：
When the protocol type of Wi-Fi signal is IEEE802.11n/ac, by reading the VHT- in 802.11ac frame heads
HT-SIGNAL information in SIG-A information or 802.11n frame heads, judges the bandwidth of Wi-Fi signal.
Wherein more preferably, when the protocol type of Wi-Fi signal is IEEE802.11n, to after decoding behind L-SIG fields
2 symbols, are decoded according to HT-SIG forms, read bandwidth information；
Read after bandwidth information, after HT-SIG fields, be demodulated and decode according to actual bandwidth.
Wherein more preferably, when the protocol type of Wi-Fi signal is IEEE802.11ac, after L-SIG fields after decoding
2, face symbol, is decoded according to the form of VHT-SIG-A information, reads bandwidth information；
Read after bandwidth information, after VHT-SIG-A information, be demodulated and decode according to actual bandwidth.
The protocol type detection method of Wi-Fi signal provided by the present invention, when receiving a frame Wi-Fi signal,
Synchronized on primary band with the signal of default bandwidth, and the L-SIG fields of decoded signal.Then, according to L-SIG words after decoding
The value in the RATE domains in section, to the constellation point mapping mode of 2 symbols judges behind L-SIG fields after decoding, passes through
Judged result determines the protocol type of Wi-Fi signal.VHT-SIG-A or HT- in frame structure by detecting Wi-Fi signal again
SIGNAL frames detect the bandwidth of Wi-Fi signal.This method is when Wi-Fi equipment is receiving a frame Wi-Fi signal, Ke Yigao
Effect promptly recognizes the protocol type and bandwidth of Wi-Fi signal, and is demodulated and decodes according to actual bandwidth rapidly.
Brief description of the drawings
Fig. 1 is existing IEEE802.11n signal schematic representation；
Fig. 2 is existing IEEE802.11ac signal schematic representation；
Fig. 3 is the flow chart of the protocol type detection method of Wi-Fi signal provided by the present invention；
Fig. 4 is the schematic diagram of existing IEEEE802.11a/g frame structures；
Fig. 5 is the schematic diagram of existing IEEE802.11n frame structures；
Fig. 6 is the schematic diagram of existing IEEE802.11ac frame structures.
Embodiment
Detailed specific description is carried out to the technology contents of the present invention with specific embodiment below in conjunction with the accompanying drawings.
Current Wi-Fi standard is in evolution forward is continued, and the IEEE802.11ac agreements of newest issue support a variety of bands
Width, meanwhile, need compatibility IEEE802.11a/g/n/ac.So when a frame Wi-Fi signal is received in Wi-Fi equipment, efficiently
Promptly identification protocol type and bandwidth, and it is rapid be demodulated and decode according to actual bandwidth there is certain difficulty.At this
In invention, when Wi-Fi equipment receives a frame Wi-Fi data frames, it is 20M bandwidth that equipment gives tacit consent to this signal first
IEEE802.11a/g signals, proceed by reception processing.Subsequently, by detect receive frame signal in VHT-SIG-A or
HT-SIGNAL information, judges frame type and bandwidth.The relatively other detection methods of the present invention, with it is simple and easy to apply, sentence
Disconnected advantage fast and accurately.
As shown in figure 3, the protocol type detection method for the Wi-Fi signal that the present invention is provided, specifically includes following steps：It is first
First, when receiving a frame Wi-Fi signal, carried out on primary band (being usually 20MHz) with the signal of minimum bandwidth threshold value same
Step, and the L-SIG fields of decoded signal.Minimum bandwidth threshold value is the minimum bandwidth in WI-FI signals transmissions, in the present invention
In the embodiment provided, minimum bandwidth threshold value is 20MHz bandwidth.Then, RATE domains in L-SIG fields after decoding
Value, to the constellation point mapping mode of 2 symbols judges behind L-SIG fields after decoding, Wi- is determined by judged result
The protocol type of Fi signals.IEEE802.11a/g agreements are using fixed 20MHz bandwidth, when the protocol type of Wi-Fi signal is
During IEEE802.11n/ac, by reading the HT- in VHT-SIG-A information and 802.11n frame heads in 802.11ac frame heads
SIGNAL information, judges the bandwidth of Wi-Fi signal.Detailed specific description is done to this process below.
For the Wi-Fi network of a support different bandwidth, in the presence of a primary band (being usually 20MHz).According to
IEEE802.11a/g, IEEE802.11n, IEEE802.11ac frame structure are (shown in 4~Fig. 6 of reference picture
IEEEE802.11a/g/n/ac frame structures) it can be seen that, the start field of different types of frame, comprising L-STF, L-LTF,
L-SIG fields (when frame data are IEEE802.11a/g data frames, its first 8 μ s data correspondence L-STF field, second
8 μ s data correspondence L-LTF fields, the 3rd 8 μ s data correspondence L-SIG field), and when band is wider than 20MHz, every section
The signal transmitted on 20MHz is identical.Therefore, in embodiment provided by the present invention, Wi-Fi equipment is receiving a frame Wi-
During Fi signals, first on primary band, synchronized with giving tacit consent to the 20MHz signal of bandwidth, and the L-SIG words of decoded signal
Section.
Then, the value in the RATE domains in L-SIG fields after decoding, to 2 symbols behind L-SIG fields after decoding
Constellation point mapping mode judged, the protocol type of Wi-Fi signal is determined by judged result.If in L-SIG fields
RATE domains be non-' 1101 ', then this frame data is the IEEE 802.11a/g data frames of 20MHz bandwidth, follow-up to carry out
IEEE802.11a/g demodulation work.If RATE domains in L-SIG fields are ' 1101 ', this frame be possible to for
Any one in IEEE802.11a/g/n/ac, is needed further by 2 symbol OFDMs after decoding behind L-SIG fields
(Orthogonal Frequency Division Multiplexing, i.e. OFDM) constellation point carries out judgment frame class
Type.
If RATE domains are ' 1101 ', the data one of 2 symbols are set to BPSK tune behind L-SIG fields after decoding
System.According to after decoding behind L-SIG fields the position judgment Wi-Fi signal that the constellation point of 2 symbols is modulated protocol type.Such as
Really the constellation point of this 2 symbols is modulated on I axles, and according to the characteristics of IEEE802.11a/g/n/ac, then this frame data is
IEEE802.11a/g agreements；IEEE802.11a/g agreements, use fixed 20MHz bandwidth.
If the constellation point of 2 symbols is modulated on Q axles behind L-SIG fields after decoding, this frame data is
This 2 symbols need to be decoded by IEEE802.11n data according to HT-SIG forms, read bandwidth information；Read bandwidth information
Afterwards, after HT-SIG fields, it is demodulated and decodes according to actual bandwidth.If two symbols behind L-SIG fields after decoding
In number, the constellation point of first symbol is modulated on I axles, the constellation point of second symbol is modulated on Q axles, according to IEEE
The characteristics of 802.11a/g/n/ac, then this frame is IEEE802.11ac frames, need to be to this 2 symbols, according to VHT-SIG-A form
Decoded, read bandwidth information therein；Read after bandwidth information, after VHT-SIG-A, solved according to actual bandwidth
Reconcile and decode.
If after decoding behind L-SIG fields in two symbols, the constellation point of first symbol is modulated on Q axles, second
The constellation point of individual symbol is modulated on I axles, then this be not Wi-Fi signal transmission protocol type, this frame data need to be abandoned.
When the protocol type of Wi-Fi signal is IEEE802.11n/ac, by reading the VHT- in 802.11ac frame heads
HT-SIGNAL information in SIG-A information and 802.11n frame heads, judges the bandwidth of Wi-Fi signal.
In summary, the protocol type detection method of Wi-Fi signal provided by the present invention, is receiving a frame Wi-Fi
During signal, synchronized on primary band with the signal for giving tacit consent to 20MHz bandwidth, and the L-SIG fields of decoded signal.Then, root
According to the value in the RATE domains in L-SIG fields after decoding, to after decoding behind L-SIG fields 2 symbols constellation point side
Formula is judged, the protocol type of Wi-Fi signal is determined by judged result.When the protocol type of Wi-Fi signal is
IEEE802.11a/g agreements, use fixed 20MHz bandwidth；When the protocol type of Wi-Fi signal is IEEE802.11n/ac
When, by reading the HT-SIGNAL information in VHT-SIG-A information and 802.11n frame heads in 802.11ac frame heads, judge
The bandwidth of Wi-Fi signal.This method efficiently can be recognized promptly when Wi-Fi equipment is receiving a frame Wi-Fi signal
The protocol type and bandwidth of Wi-Fi signal, and be demodulated and decode according to actual bandwidth rapidly.
The protocol type detection method to Wi-Fi signal provided by the present invention is described in detail above.To this
For the those skilled in the art in field, on the premise of without departing substantially from true spirit to it done it is any obvious
Change, will all constitute to infringement of patent right of the present invention, corresponding legal liabilities will be undertaken.
Claims (10)
1. the protocol type detection method of a kind of Wi-Fi signal, it is characterised in that comprise the following steps：
When receiving a frame Wi-Fi signal, synchronized on primary band with the signal of minimum bandwidth threshold value, and decode Wi-
The L-SIG fields of Fi signals；
According to the constellation point of 2 symbols behind L-SIG fields after the value in RATE domains in L-SIG fields after decoding, and decoding
Mapping mode, determines the protocol type of Wi-Fi signal.
2. the protocol type detection method of Wi-Fi signal as claimed in claim 1, it is characterised in that：
When the value in the RATE domains in L-SIG fields after decoding is not ' when 1101 ', it is determined that the protocol class of Wi-Fi signal
Type is IEEE802.11a/g.
3. the protocol type detection method of Wi-Fi signal as claimed in claim 1, it is characterised in that：
When the value in the RATE domains in L-SIG fields after decoding is ' when 1101 ', by after decoding 2 behind L-SIG fields
The judgement of the constellation point mapping mode of individual symbol, determines the protocol type of Wi-Fi signal.
4. the protocol type detection method of Wi-Fi signal as claimed in claim 3, it is characterised in that：
It is described by after decoding behind L-SIG fields the constellation point mapping mode of 2 symbols judgement, determine Wi-Fi signal
Protocol type, comprise the following steps：
Judge the position of the constellation point modulation of 2 symbols behind L-SIG fields；If the constellation point modulation of 2 symbols is equal
On I axles, then the protocol type of Wi-Fi signal is the IEEE802.11a/g of 20MHz bandwidth.
5. the protocol type detection method of Wi-Fi signal as claimed in claim 3, it is characterised in that：
It is described by after decoding behind L-SIG fields the constellation point mapping mode of 2 symbols judgement, determine Wi-Fi signal
Protocol type, also comprise the following steps：
The position of the constellation point modulation of 2 symbols behind L-SIG fields is judged, if the constellation point modulation of 2 symbols is equal
On Q axles, it is determined that the protocol type of Wi-Fi signal is IEEE802.11n.
6. the protocol type detection method of Wi-Fi signal as claimed in claim 3, it is characterised in that：
It is described by after decoding behind L-SIG fields the constellation point mapping mode of 2 symbols judgement, determine Wi-Fi signal
Protocol type, also comprise the following steps：
Judge the position of the constellation point modulation of 2 symbols behind L-SIG fields, if in the constellation point of 2 symbols, first
The constellation point of individual symbol is modulated on I axles and the constellation point of second symbol is modulated on Q axles, it is determined that Wi-Fi signal
Protocol type is IEEE802.11ac.
7. the protocol type detection method of Wi-Fi signal as claimed in claim 3, it is characterised in that：
It is described by after decoding behind L-SIG fields the constellation point mapping mode of 2 symbols judgement, determine Wi-Fi signal
Protocol type, also comprise the following steps：
Judge the position of the constellation point modulation of 2 symbols behind L-SIG fields, if in the constellation point of 2 symbols, first
The constellation point of individual symbol is modulated on Q axles, the constellation point of second symbol is modulated on I axles, then abandons a frame Wi-Fi of reception
Signal.
8. the protocol type detection method of Wi-Fi signal as claimed in claim 1, it is characterised in that also comprise the following steps：
When the protocol type of Wi-Fi signal is IEEE802.11n/ac, by reading the VHT-SIG-A in 802.11ac frame heads
HT-SIGNAL information in information or 802.11n frame heads, judges the bandwidth of Wi-Fi signal.
9. the protocol type detection method of Wi-Fi signal as claimed in claim 8, it is characterised in that：
When the protocol type of Wi-Fi signal is IEEE802.11n, to 2 symbols behind L-SIG fields after decoding, according to HT-
SIG forms are decoded, and read bandwidth information；
Read after bandwidth information, after HT-SIG fields, be demodulated and decode according to actual bandwidth.
10. the protocol type detection method of Wi-Fi signal as claimed in claim 8, it is characterised in that：
When the protocol type of Wi-Fi signal is IEEE802.11ac, to 2 symbols behind L-SIG fields after decoding, according to
The form of VHT-SIG-A information is decoded, and reads bandwidth information；
Read after bandwidth information, after VHT-SIG-A information, be demodulated and decode according to actual bandwidth.
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| CN116346556A (en) * | 2023-05-26 | 2023-06-27 | 高拓讯达(北京)微电子股份有限公司 | Signal mode detection method, device, equipment and medium in multimode receiver |
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