CN107017968B - Protocol type detection method of Wi-Fi signal - Google Patents
Protocol type detection method of Wi-Fi signal 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
- 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
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- 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
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Abstract
The invention discloses a protocol type detection method of Wi-Fi signals, which comprises the following steps: when a frame of Wi-Fi signals is received, synchronizing with the signals with the minimum bandwidth threshold value on the main frequency band, and decoding an L-SIG field of the signals; and determining the protocol type of the Wi-Fi signal according to the value of the RATE field in the L-SIG field after decoding and the constellation point mapping mode of 2 symbols behind the L-SIG field after decoding. And when the protocol type of the Wi-Fi SIGNAL is IEEE802.11n/ac, judging the bandwidth of the Wi-Fi SIGNAL by reading VHT-SIG-A information in an 802.11ac frame header and HT-SIGNAL information in an 802.11n frame header. According to the method, when the Wi-Fi device receives a frame of Wi-Fi signals, the protocol type and the bandwidth of the Wi-Fi signals can be efficiently and rapidly identified, and demodulation and decoding can be rapidly performed according to the actual bandwidth.
Description
Technical Field
The invention relates to a protocol type detection method of Wi-Fi signals, and belongs to the technical field of wireless communication.
Background
With the rapid development of the communication industry, communication protocols and technologies are rapidly advancing, and IEEE802.11 series wireless local area networks are also continuously evolving. The initial first generation ieee802.11b protocol has evolved to the fifth generation ieee802.11 ac.
The traditional ieee802.11a/g protocol uses a fixed 20MHz bandwidth, while the newly released ieee802.11n and ieee802.11ac protocols support various bandwidths, such as ieee802.11n supporting 20MHz and 40MHz bandwidths (see fig. 1), ieee802.11ac supporting 20MHz, 40MHz, 80MHz and 160MHz bandwidths (see fig. 2), and different bandwidths correspond to different parameters such as subcarrier mapping and transmission rate.
The IEEE802.11 protocol specifies that devices supporting the IEEE802.11ac protocol must be compatible with IEEE802.11a/g/n and require rapid detection of the bandwidth used by IEEE802.11ac/n frames. Because the frame structure and the subcarrier distribution are different under different protocol types and different bandwidths, the subsequent processing can be performed only after the frame type and the bandwidth are determined at the receiving end of the Wi-Fi equipment. Therefore, the protocol type and the bandwidth of the Wi-Fi signal can be quickly and accurately determined, and the method has important significance for the receiving processing of the Wi-Fi signal.
The conventional method for detecting the bandwidth of the Wi-Fi signal is to estimate the bandwidth size of the Wi-Fi signal by directly detecting the frequency spectrum energy of the Wi-Fi signal and then perform fine detection. Or the estimation is carried out in the signal synchronization stage, and then the fine detection is carried out. The two methods are complicated in steps and low in accuracy.
A method and apparatus for indicating information by modifying a modulation constellation is disclosed in chinese patent application No. 201110072089.9, and different types of packet structures can be distinguished by modifying the phase of the modulation constellation, such as a Binary Phase Shift Keying (BPSK) constellation, in the signal field. The receiving device may identify whether the type of packet structure associated with the transmission or whether the signal field is represented by a phase of a modulation constellation used to map the signal field. In one embodiment of this patent application, the phase of the modulation constellation can be determined by examining the energy of the I and Q components after a fast fourier transform.
However, the prior art does not address the protocol and bandwidth of Wi-Fi SIGNALs by detecting VHT-SIG-A or HT-SIGNAL information in the frame structure of the Wi-Fi SIGNALs.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problem to be solved by the invention is to provide a protocol type detection method of Wi-Fi signals.
In order to achieve the purpose, the invention adopts the following technical scheme:
a protocol type detection method of Wi-Fi signals comprises the following steps:
when a frame of Wi-Fi signals is received, synchronizing with the signals with the minimum bandwidth threshold value on the main frequency band, and decoding an L-SIG field of the Wi-Fi signals;
and determining the protocol type of the Wi-Fi signal according to the value of the RATE field in the L-SIG field after decoding and the constellation point mapping mode of 2 symbols behind the L-SIG field after decoding.
Preferably, when the value of the RATE field in the L-SIG field after decoding is not '1101', the protocol type of the Wi-Fi signal is determined to be IEEE802.11a/g.
Preferably, when the value of the RATE field in the decoded L-SIG field is '1101', the protocol type of the Wi-Fi signal is determined by judging the constellation point mapping mode of the last 2 symbols of the decoded L-SIG field.
Preferably, the determining the protocol type of the Wi-Fi signal by determining the constellation point mapping manner of the 2 symbols following the decoded L-SIG field includes the following steps:
judging the modulation positions of constellation points of 2 symbols behind the L-SIG field; if the constellation point modulation of the 2 symbols is on the I axis, the protocol type of the Wi-Fi signal is IEEE802.11a/g with the bandwidth of 20 MHz.
Preferably, the determining the protocol type of the Wi-Fi signal by determining the constellation point mapping manner of the 2 symbols following the decoded L-SIG field further includes the following steps:
and judging the positions of the constellation point modulations of 2 symbols behind the L-SIG field, and if the constellation point modulations of the 2 symbols are on the Q axis, determining that the protocol type of the Wi-Fi signal is IEEE802.11n.
Preferably, the determining the protocol type of the Wi-Fi signal by determining the constellation point mapping manner of the 2 symbols following the decoded L-SIG field further includes the following steps:
and judging the modulation positions of the constellation points of 2 symbols behind the L-SIG field, and if the constellation point of the first symbol is modulated on an I axis and the constellation point of the second symbol is modulated on a Q axis in the constellation points of the 2 symbols, determining that the protocol type of the Wi-Fi signal is IEEE802.11ac.
Preferably, the determining the protocol type of the Wi-Fi signal by determining the constellation point mapping manner of the 2 symbols following the decoded L-SIG field further includes the following steps:
and judging the modulation positions of the constellation points of 2 symbols behind the L-SIG field, and if the constellation point of the first symbol is modulated on a Q axis and the constellation point of the second symbol is modulated on an I axis in the constellation points of the 2 symbols, discarding the received frame of Wi-Fi signals.
Preferably, the method for detecting the protocol type of the Wi-Fi signal further includes the following steps:
and when the protocol type of the Wi-Fi SIGNAL is IEEE802.11n/ac, judging the bandwidth of the Wi-Fi SIGNAL by reading VHT-SIG-A information in an 802.11ac frame header or HT-SIGNAL information in an 802.11n frame header.
Preferably, when the protocol type of the Wi-Fi signal is IEEE802.11n, decoding 2 symbols behind the field of the decoded L-SIG according to an HT-SIG format, and reading bandwidth information;
after reading the bandwidth information, demodulation and decoding are performed according to the actual bandwidth from the HT-SIG field.
Preferably, when the protocol type of the Wi-Fi signal is IEEE802.11ac, decoding 2 symbols behind the L-SIG field after decoding according to the format of VHT-SIG-A information, and reading bandwidth information;
after reading the bandwidth information, demodulating and decoding are carried out according to the actual bandwidth from the VHT-SIG-A information.
According to the protocol type detection method of the Wi-Fi signal, when a frame of Wi-Fi signal is received, synchronization is carried out on a main frequency band by using a signal with a default bandwidth, and an L-SIG field of the signal is decoded. And then, judging the constellation point mapping mode of 2 symbols behind the decoded L-SIG field according to the value of the RATE field in the decoded L-SIG field, and determining the protocol type of the Wi-Fi signal according to the judgment result. And detecting the bandwidth of the Wi-Fi SIGNAL by detecting a VHT-SIG-A or HT-SIGNAL frame in the frame structure of the Wi-Fi SIGNAL. According to the method, when the Wi-Fi device receives a frame of Wi-Fi signals, the protocol type and the bandwidth of the Wi-Fi signals can be efficiently and rapidly identified, and demodulation and decoding can be rapidly performed according to the actual bandwidth.
Drawings
Fig. 1 is a signal diagram of the conventional ieee802.11 n;
FIG. 2 is a signal diagram of a prior art IEEE802.11 ac;
FIG. 3 is a flow chart of a method for detecting the protocol type of a Wi-Fi signal provided by the present invention;
FIG. 4 is a diagram of a conventional IEEEE802.11a/g frame structure;
fig. 5 is a schematic diagram of a conventional ieee802.11n frame structure;
fig. 6 is a diagram illustrating a conventional ieee802.11ac frame structure.
Detailed Description
The technical contents of the invention are described in detail below with reference to the accompanying drawings and specific embodiments.
In the continuous forward evolution of the current Wi-Fi standard, a newly released IEEE802.11ac protocol supports various bandwidths and is compatible with IEEE802.11a/g/n/ac. Therefore, when a Wi-Fi device receives a frame of Wi-Fi signals, it has certain difficulties to efficiently and quickly identify the protocol type and bandwidth, and quickly demodulate and decode the Wi-Fi signals according to the actual bandwidth. In the invention, when a Wi-Fi device receives a frame of Wi-Fi data frame, the device firstly defaults that the signal is an IEEE802.11a/g signal with 20M bandwidth, and starts receiving processing. Subsequently, the frame type and the bandwidth are judged by detecting the VHT-SIG-A or HT-SIGNAL information in the received frame SIGNAL. Compared with other detection methods, the method has the advantages of simplicity, easiness in implementation, rapidness in judgment and accuracy.
As shown in fig. 3, the method for detecting the protocol type of the Wi-Fi signal provided by the present invention specifically includes the following steps: first, upon receiving a frame of Wi-Fi signals, the signals are synchronized on the main frequency band (typically 20MHz) with a minimum bandwidth threshold and the L-SIG field of the signal is decoded. The minimum bandwidth threshold is the minimum bandwidth in the WI-FI signal transmission process, and in the embodiment provided by the present invention, the minimum bandwidth threshold is 20MHz bandwidth. And then, judging the constellation point mapping mode of 2 symbols behind the decoded L-SIG field according to the value of the RATE field in the decoded L-SIG field, and determining the protocol type of the Wi-Fi signal according to the judgment result. The IEEE802.11a/g protocol uses a fixed 20MHz bandwidth, and when the protocol type of the Wi-Fi SIGNAL is IEEE802.11n/ac, the bandwidth of the Wi-Fi SIGNAL is judged by reading VHT-SIG-A information in a frame header of 802.11ac and HT-SIGNAL information in a frame header of 802.11 n. This process is described in detail below.
For a Wi-Fi network supporting different bandwidths, there is one main frequency band (typically 20 MHz). According to the frame structures of ieee802.11a/g, ieee802.11n and ieee802.11ac (refer to the ieee802.11a/g/n/ac frame structures shown in fig. 4 to 6), it can be seen that the start fields of the different types of frames each include L-STF, L-LTF and L-SIG fields (when the frame data is ieee802.11a/g data frame, the first 8 μ s data corresponds to L-STF field, the second 8 μ s data corresponds to L-LTF field, and the third 8 μ s data corresponds to L-SIG field), and when the bandwidth is greater than 20MHz, the signals transmitted on each segment of 20MHz are the same. Therefore, in the embodiment provided by the invention, when receiving a frame of Wi-Fi signals, the Wi-Fi device firstly synchronizes with the signals with the default bandwidth of 20MHz on the main frequency band, and decodes the L-SIG field of the signals.
And then, judging the constellation point mapping mode of 2 symbols behind the decoded L-SIG field according to the value of the RATE field in the decoded L-SIG field, and determining the protocol type of the Wi-Fi signal according to the judgment result. If the RATE field in the L-SIG field is not '1101', the frame data is an IEEE802.11a/g data frame with the bandwidth of 20MHz, and then the demodulation work of IEEE802.11a/g is carried out. If the RATE field in the L-SIG field is '1101', the frame may be any one of ieee802.11a/g/n/ac, and the frame type needs to be further determined by the 2-symbol OFDM (Orthogonal Frequency Division Multiplexing) constellation points after the decoded L-SIG field.
If the RATE field is '1101', the data of the next 2 symbols of the decoded L-SIG field is deemed to be BPSK modulated. And judging the protocol type of the Wi-Fi signal according to the modulation position of the constellation points of 2 symbols behind the decoded L-SIG field. If the constellation point modulation of the 2 symbols is on the I axis, according to the characteristics of IEEE802.11a/g/n/ac, the frame data is IEEE802.11a/g protocol; the ieee802.11a/g protocol, using a fixed 20MHz bandwidth.
If the constellation point modulation of the 2 symbols behind the L-SIG field is on the Q axis after decoding, the frame data is IEEE802.11n data, and the 2 symbols need to be decoded according to an HT-SIG format to read bandwidth information; after reading the bandwidth information, demodulation and decoding are performed according to the actual bandwidth from the HT-SIG field. If the constellation point of the first symbol is modulated on an I axis and the constellation point of the second symbol is modulated on a Q axis in the two symbols behind the L-SIG field after decoding, according to the characteristics of IEEE802.11a/g/n/ac, the frame is an IEEE802.11ac frame, and the 2 symbols need to be decoded according to the format of VHT-SIG-A to read the bandwidth information in the frame; after reading the bandwidth information, the slave VHT-SIG-a demodulates and decodes the bandwidth information according to the actual bandwidth.
If the constellation point of the first symbol is modulated on the Q axis and the constellation point of the second symbol is modulated on the I axis in the two symbols after the L-SIG field is decoded, the data is not the protocol type of Wi-Fi signal transmission, and the frame data needs to be discarded.
And when the protocol type of the Wi-Fi SIGNAL is IEEE802.11n/ac, judging the bandwidth of the Wi-Fi SIGNAL by reading VHT-SIG-A information in an 802.11ac frame header and HT-SIGNAL information in an 802.11n frame header.
In summary, according to the protocol type detection method for Wi-Fi signals provided by the present invention, when a frame of Wi-Fi signals is received, synchronization is performed on the main frequency band with a default 20MHz bandwidth signal, and an L-SIG field of the signal is decoded. And then, judging the constellation point mapping mode of 2 symbols behind the decoded L-SIG field according to the value of the RATE field in the decoded L-SIG field, and determining the protocol type of the Wi-Fi signal according to the judgment result. When the protocol type of the Wi-Fi signal is an IEEE802.11a/g protocol, a fixed 20MHz bandwidth is used; and when the protocol type of the Wi-Fi SIGNAL is IEEE802.11n/ac, judging the bandwidth of the Wi-Fi SIGNAL by reading VHT-SIG-A information in an 802.11ac frame header and HT-SIGNAL information in an 802.11n frame header. According to the method, when the Wi-Fi device receives a frame of Wi-Fi signals, the protocol type and the bandwidth of the Wi-Fi signals can be efficiently and rapidly identified, and demodulation and decoding can be rapidly performed according to the actual bandwidth.
The protocol type detection method of Wi-Fi signals provided by the present invention is explained in detail above. Any obvious modifications to the invention, which would occur to those skilled in the art, without departing from the true spirit of the invention, would constitute a violation of the patent rights of the invention and would carry a corresponding legal responsibility.
Claims (6)
1. A protocol type detection method of Wi-Fi signals is characterized by comprising the following steps:
when a frame of Wi-Fi signals is received, synchronizing with the signals with the minimum bandwidth threshold value on the main frequency band, and decoding an L-SIG field of the WiFi signals;
determining the protocol type of the Wi-Fi signal according to the value of the RATE field in the L-SIG field after decoding and the constellation point mapping mode of 2 symbols behind the L-SIG field after decoding; wherein,
when the value of the RATE field in the L-SIG field after decoding is not '1101', determining that the protocol type of the Wi-Fi signal is IEEE802.11a/g;
when the value of the RATE field in the L-SIG field after decoding is '1101', if the constellation point modulation of the 2 symbols is on the I axis, the protocol type of the Wi-Fi signal is IEEE802.11a/g with 20MHz bandwidth; if the constellation point modulations of the 2 symbols are all on the Q axis, determining that the protocol type of the Wi-Fi signal is IEEE802.11n; if the constellation point of the first symbol is modulated on the I axis and the constellation point of the second symbol is modulated on the Q axis in the 2-symbol constellation points, determining that the protocol type of the Wi-Fi signal is IEEE802.11ac; and if the constellation point of the first symbol is modulated on the Q axis and the constellation point of the second symbol is modulated on the I axis in the constellation points of the 2 symbols, discarding the received frame of Wi-Fi signals.
2. The method for protocol type detection of Wi-Fi signals according to claim 1, further comprising the steps of:
and when the protocol type of the Wi-Fi SIGNAL is IEEE802.11n/ac, judging the bandwidth of the Wi-Fi SIGNAL by reading VHT-SIG-A information in an 802.11ac frame header or HT-SIGNAL information in an 802.11n frame header.
3. The method for protocol type detection of Wi-Fi signals according to claim 2, wherein:
and when the protocol type of the Wi-Fi signal is IEEE802.11n, decoding 2 symbols behind the L-SIG field after decoding according to an HTSIG format, and reading bandwidth information.
4. The method for protocol type detection of Wi-Fi signals of claim 3, wherein:
after reading the bandwidth information, demodulation and decoding are performed according to the actual bandwidth from the HT-SIG field.
5. The method for protocol type detection of Wi-Fi signals according to claim 2, wherein:
and when the protocol type of the Wi-Fi signal is IEEE802.11ac, decoding 2 symbols behind the L-SIG field after decoding according to the format of VHT-SIG-A information, and reading bandwidth information.
6. The method for protocol type detection of Wi-Fi signals of claim 5, wherein:
after reading the bandwidth information, demodulating and decoding are carried out according to the actual bandwidth from the VHT-SIG-A information.
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| CN103368879A (en) * | 2013-07-25 | 2013-10-23 | 西安星河亮点信息技术有限公司 | Automatic signal detection method of WLAN (Wireless Local Area Network) system |
| CN104065464A (en) * | 2013-03-18 | 2014-09-24 | 中国移动通信集团公司 | Method and device used for adjusting size of initial window of TCP connection |
| CN105432050A (en) * | 2013-04-15 | 2016-03-23 | 高通股份有限公司 | Apparatus and method using backwards-compatible preamble formats for multiple access WLAN communication system |
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| CN104065464A (en) * | 2013-03-18 | 2014-09-24 | 中国移动通信集团公司 | Method and device used for adjusting size of initial window of TCP connection |
| CN105432050A (en) * | 2013-04-15 | 2016-03-23 | 高通股份有限公司 | Apparatus and method using backwards-compatible preamble formats for multiple access WLAN communication system |
| CN103368879A (en) * | 2013-07-25 | 2013-10-23 | 西安星河亮点信息技术有限公司 | Automatic signal detection method of WLAN (Wireless Local Area Network) system |
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