CN107735995A

CN107735995A - A kind of data detection method and device

Info

Publication number: CN107735995A
Application number: CN201580081297.1A
Authority: CN
Inventors: 刘云; 刘晟
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-07-09
Filing date: 2015-07-09
Publication date: 2018-02-23
Anticipated expiration: 2035-07-09
Also published as: WO2017004836A1; CN107735995B

Abstract

The invention provides a kind of data detection method, and applied in WLAN, this method includes：By the signal multiplication of correspondence position data subcarrier in first orthogonal frequency division multiplex OFDM symbol after the signal of data subcarrier in legacy signaling field L SIG in the PPDU and the L SIG, the information of the PPDU carryings is determined according to the result of multiplication, by the above-mentioned means, the embodiment of the present invention additionally provides corresponding data detection device.By using methods and apparatus of the present invention, can efficiently distinguish 11ax physical layer packets, avoid erroneous judgement caused by receiving periodic signal.

Description

A kind of data detection method and device

Technical field

The invention belongs to field of communication technology more particularly to a kind of data detection methods and device.

Background technique

It is existing (English: Orthogonal Frequency-Division Multiplexing based on OFDM, Chinese: orthogonal frequency division multiplexing) technology WLAN (English: Wireless local Access Network, referred to as: WLAN) standard is made of versions such as 802.11a, 802.11n, 802.11ac of gradually evolution, IEEE (English: Institute of Electrical and Electronic Engineers, Chinese: Institute of Electrical and Electronics Engineers) 802.11 normal structures have had been turned on referred to as HEW (High Effi at present Ciency WLAN, high efficiency WLAN) wlan standard 802.11ax of new generation standardization effort, by introducing OFDMA (Orthogonal Frequency-Division Multiple Access, orthogonal frequency division multiplexing multiple access) technology, 802.11ax can be further improved transmission performance of the WLAN under intensive user scene.

However, existing wlan device, can not distinguish 802.11ax grouping, periodic signal, traditional WLAN grouping very well.

Summary of the invention

A kind of data detection method and device are provided herein, can efficiently distinguish 802.11ax grouping, periodic signal and traditional WLAN grouping.

In a first aspect, being applied to WLAN WLAN the embodiment of the invention provides a kind of data detection method, comprising:

Receive physical layer protocol data unit PPDU；

By the signal multiplication of corresponding position data subcarrier in first orthogonal frequency division multiplex OFDM symbol in the PPDU in legacy signaling field L-SIG after the signal of data subcarrier and the L-SIG；

The information that the PPDU is carried is determined according to the result of multiplication.

With reference to first aspect, in the first possible implementation of the first aspect, the result according to multiplication determines the information that the PPDU is carried, comprising: the result of the multiplication is divided into two Group, each group all includes the discontinuous data subcarrier of frequency domain, determines the first bit information according to first group of result, determines the second bit information according to second group of result.

With reference to first aspect, in the second possible implementation of the first aspect, the signal multiplication of corresponding position data subcarrier in first orthogonal frequency division multiplex OFDM symbol by the PPDU in legacy signaling field L-SIG after the signal of data subcarrier and the L-SIG, comprising:

Data subcarrier in the L-SIG is divided into two groups, each group all includes the discontinuous data subcarrier of frequency domain；

By the signal multiplication of the data subcarrier of corresponding position in first OFDM symbol after the signal and L-SIG of first group of data subcarrier in L-SIG, by the signal multiplication of the data subcarrier of corresponding position in first OFDM symbol after the signal and L-SIG of second group of data subcarrier in L-SIG；

The result according to multiplication determines the information that the PPDU is carried, comprising: determines the first bit information according to the result of first group of multiplication, determines the second bit information according to the result of second group of multiplication.

Any one possible implementation in the first possible implementation and second of possible implementation with reference to first aspect, in first aspect in the third possible implementation, the first bit information and the second bit information that the PPDU is carried are used to indicate the protocol version of the PPDU ownership.

Second aspect, the embodiment of the invention provides a kind of data detection methods, are applied to WLAN WLAN, comprising:

Receive physical layer protocol data unit PPDU；

The signal of data subcarrier in first orthogonal frequency division multiplex OFDM symbol after legacy signaling field L-SIG in the PPDU is multiplied with one or more features sequence；

Signal after multiplication is done into cross correlation process with L-SIG；

The information that the PPDU is carried is determined according to the result of the cross correlation process.

In conjunction with second aspect, in the first possible implementation of the second aspect, the signal of data subcarrier is multiplied with a characteristic sequence in first orthogonal frequency division multiplex OFDM symbol by after legacy signaling field L-SIG in the PPDU, comprising:

The signal of data subcarrier is multiplied with the characteristic sequence in first OFDM symbol after the L-SIG.

In conjunction with second aspect, in a second possible implementation of the second aspect, the characteristic sequence is two, and the signal of data subcarrier is multiplied with two characteristic sequences in first orthogonal frequency division multiplex OFDM symbol by after legacy signaling field L-SIG in the PPDU, comprising:

The signal of data subcarrier in first OFDM symbol after the L-SIG is multiplied with two characteristic sequences respectively, obtains the first scramble sequence and the second scramble sequence；

The signal by after multiplication and L-SIG do cross correlation process, comprising:

First scramble sequence and the second scramble sequence are done into cross correlation process with L-SIG respectively.

In conjunction with second of second aspect possible implementation, in second aspect in the third possible implementation, the result according to the cross correlation process determines the information that the PPDU is carried, include: that the first bit information is determined according to the result that first scramble sequence and L-SIG do cross correlation process, the second bit information is determined according to the result that second scramble sequence and L-SIG do cross correlation process.

In conjunction with second aspect and its above-mentioned implementation, in the 4th kind of possible implementation of second aspect, the characteristic sequence is the sequence of+1 and-1 composition, the characteristic sequence includes a bit subsequence or multiple bit subsequences, and the bit subsequence includes: [+1+1+1+1], [+1+1-1-1], [+1-1-1+1], [+1-1+1-1], [- 1-1-1-1], [- 1-1+1+1], [- 1+1+1-1] or [- 1+1-1+1].

In conjunction with second aspect and its above-mentioned implementation, in the 5th kind of possible implementation of second aspect, data subcarrier number is identical as data subcarrier number in L-SIG in the characteristic sequence, in the characteristic sequence data subcarrier number with data subcarrier number is identical in first OFDM symbol after L-SIG.

The third aspect, the embodiment of the invention provides a kind of data detection devices, are applied to WLAN WLAN, comprising:

Transmit-Receive Unit, for receiving physical layer protocol data unit PPDU；

Processing unit, for by the signal multiplication of corresponding position data subcarrier in first orthogonal frequency division multiplex OFDM symbol in the PPDU in legacy signaling field L-SIG after the signal of data subcarrier and the L-SIG；

The processing unit is also used to determine the information that the PPDU is carried according to the result of multiplication.

In conjunction with the third aspect, in the first possible implementation of the third aspect, the processing unit determines the information of the PPDU carrying according to the result of multiplication, comprising: the result of the multiplication is divided into two groups, each group all includes the discontinuous data subcarrier of frequency domain, according to first group of knot Fruit determines the first bit information, determines the second bit information according to second group of result.

In conjunction with the third aspect, in the second possible implementation of the third aspect, the processing unit is by the signal multiplication of corresponding position data subcarrier in first orthogonal frequency division multiplex OFDM symbol in the PPDU in legacy signaling field L-SIG after the signal of data subcarrier and the L-SIG, comprising:

Any one possible implementation in conjunction with the third aspect in the first possible implementation and second of possible implementation, in the third aspect in the third possible implementation, the first bit information and the second bit information that the PPDU is carried are used to indicate the protocol version of the PPDU ownership.

Fourth aspect, the embodiment of the invention provides a kind of data detection devices, are applied to WLAN WLAN, comprising:

Transmit-Receive Unit, for receiving physical layer protocol data unit PPDU；

Processing unit, for the signal of data subcarrier in first orthogonal frequency division multiplex OFDM symbol after legacy signaling field L-SIG in the PPDU to be multiplied with one or more features sequence；

The processing unit is also used to the signal after being multiplied and L-SIG doing cross correlation process；

The processing unit is also used to determine the information that the PPDU is carried according to the result of the cross correlation process.

In conjunction with fourth aspect, in the first possible implementation of the fourth aspect, the signal of data subcarrier in first orthogonal frequency division multiplex OFDM symbol after legacy signaling field L-SIG in the PPDU is multiplied by the processing unit with a characteristic sequence, comprising:

The signal of data subcarrier and the spy in first OFDM symbol after the L-SIG Sequence is levied to be multiplied.

In conjunction with fourth aspect, in the second possible implementation of the fourth aspect, the characteristic sequence is two, the signal of data subcarrier in first orthogonal frequency division multiplex OFDM symbol after legacy signaling field L-SIG in the PPDU is multiplied by the processing unit with two characteristic sequences, comprising:

In conjunction with second of fourth aspect possible implementation, in fourth aspect in the third possible implementation, the processing unit determines the information that the PPDU is carried according to the result of the cross correlation process, include: that the first bit information is determined according to the result that first scramble sequence and L-SIG do cross correlation process, the second bit information is determined according to the result that second scramble sequence and L-SIG do cross correlation process.

In conjunction with fourth aspect and its above-mentioned implementation, in the 4th kind of possible implementation of fourth aspect, the characteristic sequence is the sequence of+1 and-1 composition, the characteristic sequence includes a bit subsequence or multiple bit subsequences, and the bit subsequence includes: [+1+1+1+1], [+1+1-1-1], [+1-1-1+1], [+1-1+1-1], [- 1-1-1-1], [- 1-1+1+1], [- 1+1+1-1] or [- 1+1-1+1].

In conjunction with fourth aspect and its above-mentioned implementation, in the 5th kind of possible implementation of fourth aspect, data subcarrier number is identical as data subcarrier number in L-SIG in the characteristic sequence, in the characteristic sequence data subcarrier number with data subcarrier number is identical in first OFDM symbol after L-SIG.

The embodiment of the present invention is in the data detection process of WLAN, by the signal multiplication of corresponding position data subcarrier in first orthogonal frequency division multiplex OFDM symbol in the PPDU in legacy signaling field L-SIG after the signal of data subcarrier and the L-SIG, the information that the PPDU is carried is determined according to the result of multiplication, through the above way, 11ax physical layer packet can be efficiently distinguished, erroneous judgement caused by receiving periodic signal is avoided.

Detailed description of the invention

Fig. 1 is the application scenario diagram of the embodiment of the present invention.

Fig. 2 is the physical layer packet structure figure in existing wlan standard.

Fig. 3 is the planisphere that BPSK and QBPSK is modulated.

Fig. 4 is a kind of possible physical layer packet structure figure of 802.11ax.

Fig. 5 is the generating process of scrambled RL-SIG field.

Fig. 6 is the method flow diagram of the embodiment of the present invention 1.

Fig. 7 is the functional block diagram of the embodiment of the present invention 1.

Fig. 8 is the method flow diagram of the embodiment of the present invention 2.

Fig. 9 is the functional block diagram of 2 method 1 of the embodiment of the present invention.

Figure 10 is the functional block diagram of 2 method 2 of the embodiment of the present invention.

Figure 11 is the building-block of logic of 3 receiving station of the embodiment of the present invention.

Figure 12 is the building-block of logic of 4 receiving station of the embodiment of the present invention.

Figure 13 is the physical structure of 5 website of the embodiment of the present invention.

Specific embodiment

To make the object, technical solutions and advantages of the present invention clearer, the specific embodiment of the invention is described in further detail with reference to the accompanying drawing.In order to fully understand the present invention, numerous details are referred in the following detailed description.Based on the embodiments of the present invention, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, shall fall within the protection scope of the present invention.

The embodiment of the present invention can be applied to WLAN, and WLAN accepted standard is IEEE802.11 series at present.WLAN may include multiple basic service sets (English: Basic Service Set, referred to as: BSS), the network node that basic service is concentrated is website (English: Station, referred to as: STA), website includes the website (abbreviation: AP of access point class, English: Access Point) and non-access point class website (English: None Access Point Station, abbreviation: Non-AP STA).Each basic service set may include an AP and multiple Non-AP STA for being associated with the AP.

Access point class website, also referred to as wireless access points or hot spot etc..AP is the access point that mobile subscriber enters cable network, and major deployments are inside family, inside buildings and garden, allusion quotation Type covering radius is tens meters to rice up to a hundred, it is of course also possible to be deployed in open air.AP is equivalent to the bridge of connection a wired network and wireless network, and main function is to connect together each wireless network clients, then by wireless network access network based on ethernet.Specifically, AP can be terminal device or the network equipment with WiFi (English: Wireless Fidelity, Chinese: Wireless Fidelity) chip.Optionally, AP can be the equipment of support 802.11ax standard, and still optionally further, which can be the equipment of a variety of WLAN standards such as support 802.11ac, 802.11n, 802.11g, 802.11b and 802.11a.

The website (English: None Access Point Station, abbreviation: Non-AP STA) of non-access point class, can be wireless communications chips, wireless sensor or wireless communication terminal.Such as: the mobile phone for supporting WiFi communication function, the tablet computer for supporting WiFi communication function, the set-top box for supporting WiFi communication function, the smart television for supporting WiFi communication function, the intelligent wearable device for supporting WiFi communication function, the vehicular communication equipment for supporting WiFi communication function and the computer for supporting WiFi communication function.Optionally, website can support 802.11ax standard, and still optionally further, which supports a variety of WLAN standards such as 802.11ac, 802.11n, 802.11g, 802.11b and 802.11a.

Fig. 1 is the system schematic of a typical WLAN deployment scene, including AP and 3 STA, AP are communicated with STA1, STA2 and STA3 respectively.

The physical layer packet structure of 802.11ax in order to better understand, Fig. 2 shows the physical layer packet structures of 802.11a, 802.11n and 802.11ac, wherein, the part that they most start is legacy preamble (Legacy Preamble), i.e. by Legacy Short Training Field (Legacy Short Training field, abbreviation L-STF), traditional long training field (Legacy Long Training field, abbreviation L-LTF) and legacy signaling field (Legacy Signal field, abbreviation L-SIG) composition field.802.11a physical layer packet is data field after legacy preamble, and it is specifically leading to also add agreement between legacy preamble and data field for 802.11n and 802.11ac physical layer packet.Wherein, the agreement particular preamble of 802.11n physical layer packet is by high-throughput signaling field (High Throughput Signal field, abbreviation HT-SIG), high-throughput short training field (High Throughput Short Training field, abbreviation HT-STF) and high-throughput long training field (High Throughput Long Training field, abbreviation HT-LTF) composition；The agreement particular preamble of 802.11ac physical layer packet is by high throughput signaling A field (Very High Throughput Signal-A field, abbreviation VHT-SIG-A), high throughput short training field (Very High Throughput Short Training field, abbreviation VHT-STF), pole High-throughput long training field (Very High Throughput Long Training field, abbreviation VHT-LTF) and high throughput signaling B field (Very High Throughput Signal-B field, abbreviation VHT-SIG-B) composition.

In the wlan standard based on OFDM technology such as 802.11a, 802.11n, 802.11ac, the basic constitutional unit of each physical layer packet is OFDM symbol, each OFDM symbol includes cyclic prefix (Cyclic Prefix, abbreviation CP) length be 4 microseconds, typically, circulating prefix-length is 0.8 microsecond.As shown in Fig. 2, only one OFDM symbol of L-SIG, HT-SIG and VHT-SIG-A then include two OFDM symbols, each OFDM symbol includes 64 subcarriers on frequency domain, wherein, data subcarrier has 48, for carrying the modulation symbol of respective physical layers control information.

In 802.11n, the modulation symbol carried on the data subcarrier of two OFDM symbols of HT-SIG is modulated using orthogonal binary phase-shift keying (PSK) (Quadrature Binary Phase Shift Keying, abbreviation QBPSK)；Wherein, QBPSK modulation has rotated 90 degree compared to common binary phase shift keying (Binary Phase Shift Keying, abbreviation BPSK) planisphere, as shown in Figure 3.Since two OFDM symbols of the 802.11a after L-SIG will not be modulated using QBPSK, therefore, the receiver of 802.11n can according to received WLAN physical layer packet L-SIG after first OFDM symbol feature, i.e., whether the modulation symbol carried on its 48 data subcarriers is QBPSK modulation to distinguish the physical layer packet of 802.11n and 802.11a.In 802.11ac, the modulation symbol carried on the data subcarrier of second OFDM symbol of VHT-SIG-A also uses QBPSK to modulate, but the modulation symbol carried on the data subcarrier of first OFDM symbol is modulated using BPSK, therefore, the receiver of 802.11n will not be by the physical layer packet of 802.11ac as the physical layer packet of 802.11n, and the receiver of 802.11ac then can according to first OFDM symbol after received WLAN physical layer packet L-SIG 48 data subcarriers on the modulation symbol that carries whether be QBPSK modulation distinguish the physical layer packet of 802.11ac and 802.11a, and according to the received WLAN physical layer packet L-SIG of institute Whether the modulation symbol carried on 48 data subcarriers of second OFDM symbol later is BPSK modulation to distinguish the physical layer packet of 802.11ac and 802.11n.

Fig. 4 shows the physical layer packet structure of possible 802.11ax a kind of, its part most started is also legacy preamble, the field being made of L-STF, L-LTF and L-SIG, it is finally data field, leading for the specific leading i.e. HEW of 802.11ax agreement between legacy preamble and data field, HEW leading first character section is high efficiency signaling A field (High Efficiency Signal-A Field, abbreviation HE-SIG-A), HE-SIG-A is made of the OFDM symbol that at least one length is 4 microseconds, between L-SIG and HE-SIG-A, first OFDM symbol after L-SIG is the OFDM symbol that a length is 4 microseconds, and second OFDM symbol after L-SIG is first OFDM symbol of HE-SIG-A.

In order to realize the automatic detection of 802.11ax physical layer packet, the physical layer packet of 802.11ax is mistaken for the physical layer packet of 802.11n or 802.11ac by the receiver that 802.11n or 802.11ac should be avoided first, thus, first after 802.11ax physical layer packet L-SIG and second OFDM symbol are all made of BPSK modulation, as shown in Figure 4.

Simultaneously, in order to allow the reception function of 802.11ax correctly to identify the physical layer packet of 802.11ax and reduce probability of miscarriage of justice, the repetition that first OFDM symbol after L-SIG is L-SIG is proposed in standard formulation, that is first OFDM symbol after L-SIG is identical as the data information that the OFDM symbol of L-SIG is transmitted, referred to as RL-SIG (Repeated L-SIG).RL-SIG is generated by the bpsk signal of the data subcarrier in L-SIG multiplied by the characteristic sequence that some is formed by+1 or -1, and detailed process is as shown in Figure 5.The receiver of 802.11ax is after receiving RL-SIG, multiplied by this feature sequence on the data subcarrier of RL-SIG, the data of obtained data and L-SIG is then carried out repeated comparison, can correctly identify the physical layer packet of 802.11ax.However, this feature sequence not yet determines at present.

Other companies propose to utilize the scheme of RL-SIG transmission information bit, include following three kinds of technical solutions.

In the prior art one, characteristic sequence is whole+1 or all -1.Receiving end can be positive correlation or negative correlation according to the correlation of signal on RL-SIG and L-SIG data subcarrier, judgement in this way.According to the correlation, a bit information can be transmitted.But it is had certain problems in the prior art one.Firstly, the 5GHz frequency range where WLAN is unlicensed spectrum, other equipment in addition to WLAN may use the band external leakage of the frequency range or other wireless devices possibly into the frequency range, and these interference signals much have periodicity.When characteristic sequence is all+1 sequences, RL-SIG and the completely duplicate feature of L-SIG are easy to be influenced by periodic jamming signals, to increase the risk that the physical layer packet of non-802.11ax is mistaken for the physical layer packet of 802.11ax；In addition, the prior art one does not consider the support of the new version agreement later to 802.11ax, i.e. new version agreement needs to redesign a new mode to be detected automatically to the physical layer packet of new version agreement.

In the prior art two, by the way that the data subcarrier of RL-SIG is divided into two groups, on 20MHz, Preceding 10MHz points are one group, and rear 10MHz points are one group, one bit information of each group of transmission.So the first half element of characteristic sequence is complete+1 or complete -1 simultaneously in the prior art two, later half element is complete+1 or complete -1 simultaneously.In this way, receiving end is by judging that RL-SIG and the L-SIG signal correlation on the corresponding data subcarrier of the first half element judge a bit information；Equally, receiving end is by judging that RL-SIG and the L-SIG signal correlation on the corresponding data subcarrier of later half element judge another bit information.But there are problems in the prior art two, it is specific as follows: by transmitting 2 bit informations, the about 3~4dB poorer than the performance of BER of the prior art one of the prior art two；In addition, since the prior art two only chooses the corresponding data subcarrier of some bit in 10MHz, rather than chosen in 20MHz, thus the prior art two does not obtain the diversity gain of entire 20MHz.

In the prior art three, by decoding the information of L-SIG and RL-SIG, data packet length information is obtained, and the remainder whether obtained divided by 3 by the length information is 1 or 2 to indicate a bit information.It in order to distinguish the data packet of new standard and in the past the data packet of standard, the data packet length information of 802.11ax data packet transmission are not 3 integral multiples, i.e., is 1 or 2 divided by remainder after 3 in 802.11ax system.To which the remainder can be used to refer to a bit information.But it is had certain problems in the prior art three.In 802.11ax system, receiving end is needed through complicated process decoding to obtain data packet length information, and the processing time is longer.When indicating next symbol using implicit information, may have little time to be indicated

It is the statement to the prior art above, scheme proposed by the present invention will be illustrated below.

Embodiment 1

The embodiment of the present invention 1 provides a kind of data detection method applied in WLAN, and this method can be applied to website, such as: AP and STA1-STA3 in Fig. 1, the website can support next generation wlan standard, such as: 802.11ax standard.Fig. 6 is the flow chart of the data detection method, the specific steps are as follows:

Step 110: receiving physical layer protocol data unit PPDU.

Step 120: by the signal multiplication of corresponding position data subcarrier in first orthogonal frequency division multiplex OFDM symbol in the PPDU in legacy signaling field L-SIG after the signal of data subcarrier and the L-SIG.

Step 130: the information that the PPDU is carried is determined according to the result of multiplication.

It should be noted that first orthogonal frequency division multiplex OFDM symbol in the present invention after L-SIG refers to RL-SIG, the two indicates same concept.

Specifically, step 120 and step 130 include at least two processing methods in embodiment 1.

Method 1: being divided into two groups for the result of the multiplication, and each group all includes the discontinuous data subcarrier of frequency domain, determines the first bit information according to first group of result, determines the second bit information according to second group of result.

Specifically, L-SIG includes 48 data subcarriers, is illustrated by taking 48 data subcarriers as an example below.By above-mentioned 48 data subcarriers, according to frequency, sequencing numbers are subcarrier 1-48 from small to large, by the signal multiplication of data subcarrier in first OFDM symbol after the signal and L-SIG of data subcarrier in L-SIG.

Illustratively, odd subcarriers (1,3,5 ..., 47) are set as first group, even subcarriers (2,4,6 ..., 48) is set as second group, calculate separately the result of two groups of data subcarriers multiplication.If first group of result is greater than 0, then determine that the first bit information is 1, if first group of result is less than or equal to 0, then determine that the first bit information is 0, there can also be other definition for the value of the first bit information, if first group of result is greater than 0, it is determined that the first bit information is 0, if first group of result is less than or equal to 0, it is determined that the first bit information is 1.The value of second bit information is repeated no more with the first bit information.

Illustratively, by subcarrier serial number mould more than 41 and mould more than 42 (1,2,5,6 ..., 45,46) it is set as first group, it will be by subcarrier serial number mould more than 40 and mould more than 43 (3,4,7,8 ..., 47,48) it is set as second group, calculates separately the result of two groups of data subcarriers multiplication.The calculation method of first bit information and the second bit information is same as above, and is repeated no more.

Method 2: the data subcarrier in the L-SIG is divided into two groups, each group all includes the discontinuous data subcarrier of frequency domain；

By the signal multiplication of the data subcarrier of corresponding position in first OFDM symbol after the signal and L-SIG of first group of data subcarrier in L-SIG, by the signal multiplication of the data subcarrier of corresponding position in first OFDM symbol after the signal and L-SIG of second group of data subcarrier in L-SIG.

The first bit information is determined according to the result of first group of multiplication, and the second bit information is determined according to the result of second group of multiplication.

Specifically, Fig. 7 shows the information detecting method of method 2.802.11ax receiver is after the time-domain signal of first OFDM symbol after the L-SIG for receiving a WLAN physical layer packet, L-SIG and RL-SIG are removed CP respectively, pass through 64 points of Fast Fourier Transform (Fast Fourier transform again, abbreviation FFT) frequency domain is transformed to, it is corresponding that the 1st bit information is then demultiplex out Data subcarrier signals and the corresponding data subcarrier signals of the 2nd bit information.The data subcarrier signals of 1st bit corresponding in L-SIG are multiplied with the data subcarrier signals of the 1st bit corresponding in RL-SIG, that is, do correlation calculations.By multiplication the result is that positive number or negative judge first bit information.Similarly, the data subcarrier signals of the 2nd bit corresponding in L-SIG are multiplied with the data subcarrier signals of the 2nd bit corresponding in RL-SIG, multiplication the result is that positive number or negative judge second bit information.

It should be noted that the difference of method 2 and method 1 is: method 1 first allows the signal multiplication of data subcarrier, is then grouped to the result of multiplication, obtains the information of 2 bits.Method 1 is first grouped data subcarrier, then by the signal multiplication of each group of data subcarrier, according to multiplication as a result, obtaining the information of 2 bits.

Optionally, the first bit information and the second bit information that the PPDU is carried are used to indicate the protocol version of the PPDU ownership.Such as: " 00 " corresponding first wlan standard, " 01 " corresponding second wlan standard etc..

Optionally, the repeatability that RL-SIG needs not only to be L-SIG compares, while being also possible to the information of following three aspects of transmitting.Firstly, RL-SIG needs to indicate whether the HE-SIG-A after RL-SIG does repetition transmission.In different scenes, such as indoor and outdoors, the intensity of signal, the condition of environment and interference are different, and HE-SIG-A may need to do in some scenes repetition transmission, and not do repetition transmission in some scenes.This just needs the instruction information an of bit.Secondly, in terms of in view of to the support of the new version agreement after 802.11ax, an at least additional bit may be needed to be indicated that, if do not indicated, future, new version agreement may need to redesign a new mode to be detected automatically to the physical layer packet of new version agreement.In addition to above two, the fuzziness of Signal extension is indicated, it is also possible to RL-SIG be needed to carry out information transmission.In this way, in view of in terms of three above, RL-SIG can at least transmit the information of 2 bits.This section of content is applied equally to other embodiments of the invention.

Embodiment 2

The embodiment of the present invention 2 provides a kind of data detection method applied in WLAN, this method It can be applied to website, such as: AP and STA1-STA3 in Fig. 1, the website can support next generation wlan standard, such as: 802.11ax standard.Fig. 8 is the flow chart of the data detection method, the specific steps are as follows:

Step 210: receiving physical layer protocol data unit PPDU.

Step 220: the signal of data subcarrier in first orthogonal frequency division multiplex OFDM symbol after legacy signaling field L-SIG in the PPDU is multiplied with one or more features sequence.

Step 230: the signal after multiplication is done into cross correlation process with L-SIG.

Step 240: the information that the PPDU is carried is determined according to the result of the cross correlation process.

Specifically, step 220 and step 230 include at least two schemes.

Scheme 1: the signal of data subcarrier is multiplied with the characteristic sequence in first OFDM symbol after the L-SIG.

Specifically, the processing block diagram of scheme 1 is as shown in Figure 9.It is mentioned in foregoing teachings, transmitter is when generating PPDU, OFDM symbol after being scrambled after being multiplied to first OFDM symbol after L-SIG with characteristic sequence, assuming that there is no errors of transmission by the PPDU, so receiver is multiplied again to the OFDM symbol after scrambling with characteristic sequence, obtains the original contents of the OFDM symbol.The OFDM symbol and L-SIG are done into cross-correlation, if cross correlation results are greater than threshold value, receiver determines that the PPDU belongs to 802.11ax grouping, if cross correlation results are less than or equal to threshold value, which belongs to traditional WLAN grouping.

Specifically, the characteristic sequence mentioned in scheme 1 is the sequence of+1 and-1 composition, the characteristic sequence is made of bit subsequence, and the bit subsequence includes: [+1+1+1+1], [+1+1-1-1], [+1-1-1+1], [+1-1+1-1], [- 1-1-1-1], [- 1-1+1+1], [- 1+1+1-1] or [- 1+1-1+1].

It should be noted that data subcarrier number is identical as data subcarrier number in L-SIG in the characteristic sequence mentioned in the present embodiment, in the characteristic sequence data subcarrier number with data subcarrier number is identical in first OFDM symbol after L-SIG.Preferably, data subcarrier number is 48 or 52 in characteristic sequence.Statement for this feature sequence, is also applied for other embodiments of the invention.

Specifically, it is illustrated so that characteristic sequence includes 48 data subcarriers as an example.This feature sequence is made of 12 bit subsequences, and bit subsequence has 8 kinds of possibility.The sequence of complete+1 and complete -1 is removed, this feature sequence includes 8¹²- 2=68719476734 kind is possible, since the type of this feature sequence is too many, only enumerates several preferred feature sequences.

Characteristic sequence one: [+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1, + 1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1, + 1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1]

Characteristic sequence two: [- 1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1, -1 ,+1]

Odd subcarriers are+1 in characteristic sequence one, and even subcarriers are -1.Odd subcarriers are -1 in characteristic sequence two, and even subcarriers are+1.

Characteristic sequence three: [+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1, + 1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1, + 1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1]

Characteristic sequence four: [- 1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1]

Three sub-carriers serial number mould of characteristic sequence, 4 excess-three and mould more than 4 zero are+1, remaining is -1.Four sub-carriers serial number mould more than 4 one of characteristic sequence and 4 Yu Erwei -1 of mould, remaining is+1.

Characteristic sequence five: [+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1, + 1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1, + 1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1]

Characteristic sequence six: [- 1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1, -1 ,+1 ,+1, -1]

Five sub-carriers serial number mould more than 4 two of characteristic sequence and 4 excess-three of mould are -1, remaining is+1, and six sub-carriers serial number mould more than 4 two of characteristic sequence and 4 excess-three of mould are+1, remaining is -1.

Characteristic sequence seven: [- 1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1]

Characteristic sequence eight: [+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1, + 1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1, + 1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1]

Seven sub-carriers serial number mould more than 4 one, two and three of characteristic sequence is+1, remaining is -1.Feature Eight sub-carriers serial number mould more than 4 one, two and three of sequence is -1, remaining is+1.

Characteristic sequence nine: [- 1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1]

Characteristic sequence ten: [+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1, + 1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1, + 1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1]

Nine sub-carriers serial number mould more than 4 one, two and four of characteristic sequence is -1, remaining is+1.Ten sub-carriers serial number mould more than 4 one, two and four of characteristic sequence is+1, remaining is -1.

Characteristic sequence 11: [- 1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1]

Characteristic sequence 12 [+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1, + 1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1, + 1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1]

11 sub-carriers serial number mould more than 4 one, three and four of characteristic sequence is -1, remaining is+1.12 sub-carriers serial number mould more than 4 one, three and four of characteristic sequence is+1, remaining is -1.

Characteristic sequence 13: [- 1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1, -1 ,+1 ,+1 ,+1]

Characteristic sequence 14 [+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1, + 1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1, + 1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1 ,+1, -1, -1, -1]

13 sub-carriers serial number mould more than 4 two, three and four of characteristic sequence is+1, remaining is -1.14 sub-carriers serial number mould more than 4 two, three and four of characteristic sequence is -1, remaining is+1.

Characteristic sequence 15: [+1 ,+1 ,+1, -1, -1, -1 ,+1 ,+1 ,+1, -1, -1, -1 ,+1 ,+1 ,+1, -1, -1, -1 ,+1 ,+1 ,+1, -1, -1, -1 ,+1 ,+1 ,+1, -1, -1, -1 ,+1 ,+1, + 1, -1, -1, -1 ,+1 ,+1 ,+1, -1, -1, -1 ,+1 ,+1 ,+1, -1, -1, -1]

15 sub-carriers serial number of characteristic sequence, one group of every 3 data subcarriers point give+1 respectively, - 1 staggered result.

Characteristic sequence 16 [- 1, -1, -1 ,+1 ,+1 ,+1, -1, -1, -1 ,+1 ,+1 ,+1, -1, -1, -1 ,+1, + 1 ,+1, -1, -1, -1 ,+1 ,+1 ,+1, -1, -1, -1 ,+1 ,+1 ,+1, -1, -1, -1 ,+1 ,+1 ,+1, -1, -1, -1 ,+1 ,+1 ,+1, -1, -1, -1 ,+1 ,+1 ,+1]

16 sub-carriers serial number of characteristic sequence, one group of every 3 data subcarriers point give+1, -1 staggered result respectively.

Characteristic sequence 17 [+1 ,+1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, + 1 ,+1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, + 1 ,+1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1]

17 sub-carriers serial number of characteristic sequence, one group of every 4 data subcarriers point give+1, -1 staggered result respectively.

Characteristic sequence 18 [- 1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1]

18 sub-carriers serial number of characteristic sequence, one group of every 4 data subcarriers point give -1 ,+1 staggered result respectively.

Characteristic sequence 19 [+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1, + 1 ,+1, -1, -1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1]

19 sub-carriers serial number of characteristic sequence, one group of every 6 data subcarriers point give+1, -1 staggered result respectively.

Characteristic sequence 20 [- 1, -1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1 ,+1 ,+1, + 1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1]

20 sub-carriers serial number of characteristic sequence, one group of every 6 data subcarriers point give -1 ,+1 staggered result respectively.

Characteristic sequence 21: [+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1, + 1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1]

21 sub-carriers serial number of characteristic sequence is divided into 3 groups, wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment+1, and serial number is 2 to be divided into one group divided by 3 remainders, and assignment+1, serial number is removed It is 0 to be divided into one group with 3 remainders, assignment -1.

Characteristic sequence 22 [- 1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1, + 1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1]

22 sub-carriers serial number of characteristic sequence is divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment -1, serial number is 2 to be divided into one group divided by 3 remainders, assignment -1, and serial number is 0 to be divided into one group divided by 3 remainders, assignment+1.

Characteristic sequence 23 [+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1, + 1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1]

23 sub-carriers serial number of characteristic sequence is divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment+1, serial number is 2 to be divided into one group divided by 3 remainders, assignment -1, and serial number is 0 to be divided into one group divided by 3 remainders, assignment+1.

Characteristic sequence 24 [- 1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1, + 1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1]

24 sub-carriers serial number of characteristic sequence is divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment -1, serial number is 2 to be divided into one group divided by 3 remainders, assignment+1, and serial number is 0 to be divided into one group divided by 3 remainders, assignment -1.

Characteristic sequence 25 [+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1 ,+1, -1, -1]

25 sub-carriers serial number of characteristic sequence is divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment+1, serial number is 2 to be divided into one group divided by 3 remainders, assignment -1, and serial number is 0 to be divided into one group divided by 3 remainders, assignment -1.

Characteristic sequence 26 [- 1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1, + 1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1, + 1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1, -1 ,+1 ,+1]

26 sub-carriers serial number of characteristic sequence is divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment -1, serial number is 2 to be divided into one group divided by 3 remainders, assignment+1, and serial number is 0 to be divided into one group divided by 3 remainders, assignment+1.

Characteristic sequence 27 [+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1, + 1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1]

27 sub-carriers of characteristic sequence each two subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment+1, serial number are 2 to be divided into one group divided by 3 remainders, assignment+1, serial number is 0 to be divided into one group divided by 3 remainders, assignment -1.

Characteristic sequence 28 [- 1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1, + 1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1]

28 sub-carriers of characteristic sequence each two subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment -1, serial number are 2 to be divided into one group divided by 3 remainders, assignment -1, serial number is 0 to be divided into one group divided by 3 remainders, assignment+1.

Characteristic sequence 29 [+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1, + 1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1]

29 sub-carriers of characteristic sequence each two subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment+1, serial number are 2 to be divided into one group divided by 3 remainders, assignment -1, serial number is 0 to be divided into one group divided by 3 remainders, assignment+1.

Characteristic sequence 30 [- 1, -1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1, + 1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1]

30 sub-carriers of characteristic sequence each two subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment -1, serial number are 2 to be divided into one group divided by 3 remainders, assignment+1, serial number is 0 to be divided into one group divided by 3 remainders, assignment -1.

Characteristic sequence 31 [+1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1, -1, -1, -1, -1]

31 sub-carriers of characteristic sequence each two subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment+1, serial number are 2 to be divided into one group divided by 3 remainders, assignment -1, serial number is 0 to be divided into one group divided by 3 remainders, assignment -1.

Characteristic sequence 32 [- 1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, - 1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1 ,+1 ,+1 ,+1 ,+1]

32 sub-carriers of characteristic sequence each two subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment -1, serial number are 2 to be divided into one group divided by 3 remainders, assignment+1, serial number is 0 to be divided into one group divided by 3 remainders, assignment+1.

Characteristic sequence 33 [+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1, + 1 ,+1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1]

33 sub-carriers of characteristic sequence each 4 subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment+1, serial number are 2 to be divided into one group divided by 3 remainders, assignment+1, serial number is 0 to be divided into one group divided by 3 remainders, assignment -1.

Characteristic sequence 34 [- 1, -1, -1, -1, -1, -1, -1, -1 ,+1 ,+1+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1 ,+1 ,+1+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1, + 1 ,+1+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1 ,+1 ,+1+1 ,+1]

34 sub-carriers of characteristic sequence each 4 subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment -1, serial number are 2 to be divided into one group divided by 3 remainders, assignment -1, serial number is 0 to be divided into one group divided by 3 remainders, assignment+1.

Characteristic sequence 35 [+1 ,+1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, + 1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1]

35 sub-carriers of characteristic sequence each 4 subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment+1, serial number are 2 to be divided into one group divided by 3 remainders, assignment -1, serial number is 0 to be divided into one group divided by 3 remainders, assignment+1.

Characteristic sequence 36 [- 1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1, + 1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1]

36 sub-carriers of characteristic sequence each 4 subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment -1, serial number are 2 to be divided into one group divided by 3 remainders, assignment+1, serial number is 0 to be divided into one group divided by 3 remainders, assignment -1.

Characteristic sequence 37 [+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1,-1,-1,-1, +1,+1,+1,+1, -1,-1,-1,-1, -1,-1,-1,-1]

37 sub-carriers of characteristic sequence each 4 subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment+1, serial number are 2 to be divided into one group divided by 3 remainders, assignment -1, serial number is 0 to be divided into one group divided by 3 remainders, assignment -1.

Characteristic sequence 38 [- 1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, + 1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1, + 1 ,+1 ,+1 ,+1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1]

38 sub-carriers of characteristic sequence each 4 subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment -1, serial number are 2 to be divided into one group divided by 3 remainders, assignment+1, serial number is 0 to be divided into one group divided by 3 remainders, assignment+1.

Characteristic sequence 39 [+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, + 1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1]

39 sub-carriers of characteristic sequence each 8 subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment+1, serial number are 2 to be divided into one group divided by 3 remainders, assignment+1, serial number is 0 to be divided into one group divided by 3 remainders, assignment -1.

Characteristic sequence 40 [- 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 ,+1 ,+1+1 ,+1 ,+1 ,+1+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 ,+1 ,+1+1 ,+1 ,+1 ,+1+1 ,+1]

Each 8 subcarriers of 40 sub-carriers of characteristic sequence give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment -1, serial number is 2 to be divided into one group divided by 3 remainders, assignment -1, and serial number is 0 to be divided into one group divided by 3 remainders, assignment+1.

Characteristic sequence 41: [+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1, + 1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1]

41 sub-carriers of characteristic sequence each 8 subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment+1, serial number are 2 to be divided into one group divided by 3 remainders, assignment -1, serial number is 0 to be divided into one group divided by 3 remainders, assignment+1.

Characteristic sequence 42 [- 1, -1, -1, -1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + 1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1]

42 sub-carriers of characteristic sequence each 8 subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment -1, serial number are 2 to be divided into one group divided by 3 remainders, assignment+1, serial number is 0 to be divided into one group divided by 3 remainders, assignment -1.

Characteristic sequence 43: [+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1]

43 sub-carriers of characteristic sequence each 8 subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment+1, serial number are 2 to be divided into one group divided by 3 remainders, assignment -1, serial number is 0 to be divided into one group divided by 3 remainders, assignment -1.

Characteristic sequence 44 [- 1, -1, -1, -1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, + 1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1, + 1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1]

44 sub-carriers of characteristic sequence each 8 subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment -1, serial number are 2 to be divided into one group divided by 3 remainders, assignment+1, serial number is 0 to be divided into one group divided by 3 remainders, assignment+1.

Characteristic sequence 45: [+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, + 1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1]

45 sub-carriers of characteristic sequence each 16 subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment+1, serial number are 2 to be divided into one group divided by 3 remainders, assignment+1, serial number is 0 to be divided into one group divided by 3 remainders, assignment -1.

Characteristic sequence 46 [- 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 ,+1 ,+1+1 ,+1 ,+1 ,+1+1 ,+1 ,+1 ,+1+1 ,+1 ,+1 ,+1+1 ,+1]

46 sub-carriers of characteristic sequence each 16 subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment -1, serial number are 2 to be divided into one group divided by 3 remainders, assignment -1, serial number is 0 to be divided into one group divided by 3 remainders, assignment+1.

Characteristic sequence 47: [+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + 1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1]

Each 16 subcarriers of 47 sub-carriers of characteristic sequence give a serial number, are divided into 3 groups, Wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment+1, serial number is 2 to be divided into one group divided by 3 remainders, assignment -1, and serial number is 0 to be divided into one group divided by 3 remainders, assignment+1.

Characteristic sequence 48 [- 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + 1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1]

48 sub-carriers of characteristic sequence each 16 subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment -1, serial number are 2 to be divided into one group divided by 3 remainders, assignment -1, serial number is 0 to be divided into one group divided by 3 remainders, assignment+1.

Characteristic sequence 49: [+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1]

49 sub-carriers of characteristic sequence each 16 subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment+1, serial number are 2 to be divided into one group divided by 3 remainders, assignment -1, serial number is 0 to be divided into one group divided by 3 remainders, assignment -1.

Characteristic sequence 50 [- 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + 1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1, + 1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1 ,+1]

50 sub-carriers of characteristic sequence each 16 subcarriers give a serial number, are divided into 3 groups, and wherein serial number is 1 to be divided into one group divided by 3 remainders, assignment -1, serial number are 2 to be divided into one group divided by 3 remainders, assignment+1, serial number is 0 to be divided into one group divided by 3 remainders, assignment+1.

Wherein, characteristic sequence 21 arrives characteristic sequence 50, can serve to indicate that the implicit information of three bits.

Scheme 2: the signal of data subcarrier in first OFDM symbol after the L-SIG is multiplied with two characteristic sequences respectively, the first scramble sequence and the second scramble sequence are obtained, the first scramble sequence and the second scramble sequence are done into cross correlation process with L-SIG respectively.

Optionally, the first bit information is determined according to the result that first scramble sequence and L-SIG do cross correlation process, the second bit information is determined according to the result that second scramble sequence and L-SIG do cross correlation process.

Specifically, Figure 10 shows the bit information detection method of 802.11ax physical layer packet in scheme 2.802.11ax receiver removes CP after the time-domain signal of first OFDM symbol after the L-SIG for receiving a WLAN physical layer packet, L-SIG and RL-SIG respectively, then passes through 64 The Fast Fourier Transform (Fast Fourier transform, abbreviation FFT) of point transforms to frequency domain.Then the data subcarrier signals of RL-SIG respectively multiplied by characteristic sequence 1 and characteristic sequence 2, obtained result is multiplied by the data subcarrier signals of L-SIG, obtain the result of two multiplications, then multiplied result is made decisions, that biggish corresponding characteristic sequence of the absolute value of multiplied result is selected as characteristic sequence.Next, the characteristic sequence selected is the characteristic sequence of terminal decision, and can obtain 2 bit informations by this feature sequence if that biggish number of multiplied result is positive number；If that biggish number of multiplied result is negative, the characteristic sequence whole element selected is respectively the characteristic sequence of terminal decision multiplied by the characteristic sequence after -1, and 2 bit informations can be obtained by this feature sequence.

Specifically, the characteristic sequence mentioned in scheme 2 is identical as in scheme 1, repeats no more.

The embodiment of the present invention is in the data detection process of WLAN, the signal of data subcarrier in first orthogonal frequency division multiplex OFDM symbol after legacy signaling field L-SIG in the PPDU is multiplied with one or more features sequence, signal after multiplication is done into cross correlation process with L-SIG, through the above way, 11ax physical layer packet can be efficiently distinguished, erroneous judgement caused by receiving periodic signal is avoided.

Embodiment 3

Corresponding, Figure 11 is the schematic block diagram of the data detection device in the WLAN of the embodiment of the present invention 3.The data transmission device is, for example, website, either realizes the special circuit or chip of correlation function.Data transmission device 1100 shown in Figure 11 includes processing unit 1101 and Transmit-Receive Unit 1102.For example, the channel instruction device 1100 can be AP or STA1-STA3 shown in Fig. 1.Website in embodiment 3 serves as the role of receiver.

Transmit-Receive Unit 1102, for receiving physical layer protocol data unit PPDU；

Processing unit 1101, for by the signal multiplication of corresponding position data subcarrier in first orthogonal frequency division multiplex OFDM symbol in the PPDU in legacy signaling field L-SIG after the signal of data subcarrier and the L-SIG；

Processing unit 1101 is also used to determine the information that the PPDU is carried according to the result of multiplication.

Specifically, the movement executed for processing unit 1101 includes at least two schemes.

Scheme 1: the result of the multiplication is divided into two groups by processing unit 1101, and each group all includes the discontinuous data subcarrier of frequency domain, is determined the first bit information according to first group of result, is determined the second bit information according to second group of result.

Scheme 2: the data subcarrier in the L-SIG is divided into two groups, each group by processing unit It all include the discontinuous data subcarrier of frequency domain；

Processing unit determines the first bit information according to the result of first group of multiplication, determines the second bit information according to the result of second group of multiplication.

Optionally, the first bit information and the second bit information that the PPDU is carried are used to indicate the protocol version of the PPDU ownership.The information that the PPDU is carried has explaination in the aforementioned embodiment, repeats no more.

The embodiment of the present invention is in the data detection process of WLAN, processing unit is by the signal multiplication of corresponding position data subcarrier in first orthogonal frequency division multiplex OFDM symbol in the PPDU in legacy signaling field L-SIG after the signal of data subcarrier and the L-SIG, the information that the PPDU is carried is determined according to the result of multiplication, through the above way, 11ax physical layer packet can be efficiently distinguished, erroneous judgement caused by receiving periodic signal is avoided.

Embodiment 4

Corresponding, Figure 12 is the schematic block diagram of the data detection device in the WLAN of the embodiment of the present invention 4.The data transmission device is, for example, website, either realizes the special circuit or chip of correlation function.Data transmission device 1200 shown in Figure 12 includes processing unit 1201 and Transmit-Receive Unit 1202.For example, the channel instruction device 1200 can be AP or STA1-STA3 shown in Fig. 1.Website in embodiment 4 serves as the role of receiver.

Transmit-Receive Unit 1202, for receiving physical layer protocol data unit PPDU；

Processing unit 1201, for the signal of data subcarrier in first orthogonal frequency division multiplex OFDM symbol after legacy signaling field L-SIG in the PPDU to be multiplied with one or more features sequence；

The processing unit 1201 is also used to the signal after being multiplied and L-SIG doing cross correlation process；

The processing unit 1201 is also used to according to the determination of the result of the cross correlation process The information that PPDU is carried.

Specifically, the movement executed for processing unit 1201 includes at least two schemes.

Scheme 2: the signal of data subcarrier is multiplied with two characteristic sequences respectively in first OFDM symbol after the L-SIG, obtains the first scramble sequence and the second scramble sequence；

First scramble sequence and the second scramble sequence do cross correlation process with L-SIG respectively.

Further, processing unit according to the result that first scramble sequence and L-SIG do cross correlation process determines the first bit information in scheme 2, determines the second bit information according to the result that second scramble sequence and L-SIG do cross correlation process.

Specifically, the characteristic sequence is the sequence of+1 and-1 composition, the characteristic sequence includes a bit subsequence or multiple bit subsequences, and the bit subsequence includes: [+1+1+1+1], [+1+1-1-1], [+1-1-1+1], [+1-1+1-1], [- 1-1-1-1], [- 1-1+1+1], [- 1+1+1-1] or [- 1+1-1+1].

Optionally, data subcarrier number is identical as data subcarrier number in L-SIG in the characteristic sequence, in the characteristic sequence data subcarrier number with data subcarrier number is identical in first OFDM symbol after L-SIG.

The embodiment of the present invention is in the data detection process of WLAN, the signal of data subcarrier in first orthogonal frequency division multiplex OFDM symbol after legacy signaling field L-SIG in the PPDU is multiplied by processing unit with one or more features sequence, signal after multiplication is done into cross correlation process with L-SIG, through the above way, 11ax physical layer packet can be efficiently distinguished, erroneous judgement caused by receiving periodic signal is avoided.

Embodiment 5

Figure 13 is the block diagram of the data-detection apparatus of the embodiment of the present invention.The website 1300 of Figure 13 includes processor 1310, memory 1320, transceiver 1340.The operation of 1310 control site 1300 of processing unit.Memory 1320 may include read-only memory and random access memory, and provide instruction and data to processing unit 1310.The a part of of memory 1320 can also include non-volatile row random access memory (NVRAM).The various components of website 1300 are coupled by bus system 1330, and wherein bus system 1330 further includes power bus, control bus and status signal bus in addition in addition to including data/address bus.But for the sake of clear explanation, various buses are all designated as bus system 1330 in figure.

The method for the aforementioned various Data Detections of transmission that the embodiments of the present invention disclose can be applied in processor 1310, or be realized by processor 1310.During realization, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 1310 or the instruction of software form.Processor 1310 can be general processor, digital signal processor, specific integrated circuit, field programmable gate array or other programmable logic device, discrete gate, and perhaps transistor logic, discrete hardware components may be implemented or execute disclosed each method, step and logic diagram in the embodiment of the present invention.General processor can be microprocessor or any conventional processor etc..The step of method in conjunction with disclosed in the embodiment of the present invention, can be embodied directly in hardware processor and execute completion, or in processor hardware and software module combination execute completion.Software module can be located at random access memory, flash memory, read-only memory, in the storage medium of this fields such as programmable read only memory or electrically erasable programmable memory, register maturation.The step of storage medium is located at memory 1320, and processing unit 1310 reads the information in memory 1320, completes the above method in conjunction with its hardware.

Specifically, the storage of memory 1320 is so that the instruction that processing unit 1310 performs the following operations: receiving physical layer protocol data unit PPDU；By the signal multiplication of corresponding position data subcarrier in first orthogonal frequency division multiplex OFDM symbol in the PPDU in legacy signaling field L-SIG after the signal of data subcarrier and the L-SIG；The information that the PPDU is carried is determined according to the result of multiplication.

Specifically, the storage of memory 1320 is so that the instruction operated as follows can also be performed in processing unit 1310:

Receive physical layer protocol data unit PPDU；The signal of data subcarrier in first orthogonal frequency division multiplex OFDM symbol after legacy signaling field L-SIG in the PPDU is multiplied with one or more features sequence；Signal after multiplication is done into cross correlation process with L-SIG；The information that the PPDU is carried is determined according to the result of the cross correlation process.

The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although the present invention is described in detail referring to the foregoing embodiments, those skilled in the art should understand that: it is still possible to modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；And these are modified or replaceed, the range for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.

Claims

A kind of data detection method is applied to WLAN WLAN characterized by comprising

Receive physical layer protocol data unit PPDU；

By the signal multiplication of corresponding position data subcarrier in first orthogonal frequency division multiplex OFDM symbol in the PPDU in legacy signaling field L-SIG after the signal of data subcarrier and the L-SIG；

The information that the PPDU is carried is determined according to the result of multiplication.
According to the method for claim 1, it is characterized in that, the result according to multiplication determines the information that the PPDU is carried, it include: that the result of the multiplication is divided into two groups, each group all includes the discontinuous data subcarrier of frequency domain, the first bit information is determined according to first group of result, and the second bit information is determined according to second group of result.
According to the method for claim 1, it is characterized in that, the signal multiplication of corresponding position data subcarrier in first orthogonal frequency division multiplex OFDM symbol by the PPDU in legacy signaling field L-SIG after the signal of data subcarrier and the L-SIG, comprising:

Data subcarrier in the L-SIG is divided into two groups, each group all includes the discontinuous data subcarrier of frequency domain；

By the signal multiplication of the data subcarrier of corresponding position in first OFDM symbol after the signal and L-SIG of first group of data subcarrier in L-SIG, by the signal multiplication of the data subcarrier of corresponding position in first OFDM symbol after the signal and L-SIG of second group of data subcarrier in L-SIG；

The result according to multiplication determines the information that the PPDU is carried, comprising: determines the first bit information according to the result of first group of multiplication, determines the second bit information according to the result of second group of multiplication.
According to the method in claim 2 or 3, which is characterized in that the first bit information and the second bit information that the PPDU is carried are used to indicate the protocol version of the PPDU ownership.
A kind of data detection method is applied to WLAN WLAN characterized by comprising

Receive physical layer protocol data unit PPDU；

The signal of data subcarrier in first orthogonal frequency division multiplex OFDM symbol after legacy signaling field L-SIG in the PPDU is multiplied with one or more features sequence；

Signal after multiplication is done into cross correlation process with L-SIG；

The information that the PPDU is carried is determined according to the result of the cross correlation process.
According to the method described in claim 5, it is characterized in that, the signal of data subcarrier is multiplied with a characteristic sequence in first orthogonal frequency division multiplex OFDM symbol by after legacy signaling field L-SIG in the PPDU, comprising:

The signal of data subcarrier is multiplied with the characteristic sequence in first OFDM symbol after the L-SIG.
According to the method for claim 5, it is characterized in that, the characteristic sequence is two, and the signal of data subcarrier is multiplied with two characteristic sequences in first orthogonal frequency division multiplex OFDM symbol by after legacy signaling field L-SIG in the PPDU, comprising:

The signal of data subcarrier in first OFDM symbol after the L-SIG is multiplied with two characteristic sequences respectively, obtains the first scramble sequence and the second scramble sequence；

The signal by after multiplication and L-SIG do cross correlation process, comprising:

First scramble sequence and the second scramble sequence are done into cross correlation process with L-SIG respectively.
According to the method for claim 7, it is characterized in that, the result according to the cross correlation process determines the information that the PPDU is carried, include: that the first bit information is determined according to the result that first scramble sequence and L-SIG do cross correlation process, the second bit information is determined according to the result that second scramble sequence and L-SIG do cross correlation process.
According to any method of claim 5-8, it is characterized in that, the characteristic sequence is the sequence of+1 and -1 composition, the characteristic sequence includes a bit subsequence or multiple bit subsequences, and the bit subsequence includes: [+1+1+1+1], [+1+1-1-1], [+1-1-1+1], [+1-1+1-1], [- 1-1-1-1], [- 1-1+1+1], [- 1+1+1-1] or [- 1+1-1+1].
According to any method of claim 5-9, it is characterized in that, data subcarrier number is identical as data subcarrier number in L-SIG in the characteristic sequence, in the characteristic sequence data subcarrier number with data subcarrier number is identical in first OFDM symbol after L-SIG.
A kind of data detection device is applied to WLAN WLAN characterized by comprising

Transmit-Receive Unit, for receiving physical layer protocol data unit PPDU；

Processing unit, for by data subcarrier in legacy signaling field L-SIG in the PPDU The signal multiplication of signal and corresponding position data subcarrier in first orthogonal frequency division multiplex OFDM symbol after the L-SIG；

The processing unit is also used to determine the information that the PPDU is carried according to the result of multiplication.
Device according to claim 11, it is characterized in that, the processing unit determines the information that the PPDU is carried according to the result of multiplication, it include: that the result of the multiplication is divided into two groups, each group all includes the discontinuous data subcarrier of frequency domain, the first bit information is determined according to first group of result, and the second bit information is determined according to second group of result.
Device according to claim 11, it is characterized in that, the processing unit is by the signal multiplication of corresponding position data subcarrier in first orthogonal frequency division multiplex OFDM symbol in the PPDU in legacy signaling field L-SIG after the signal of data subcarrier and the L-SIG, comprising:

Data subcarrier in the L-SIG is divided into two groups, each group all includes the discontinuous data subcarrier of frequency domain；

By the signal multiplication of the data subcarrier of corresponding position in first OFDM symbol after the signal and L-SIG of first group of data subcarrier in L-SIG, by the signal multiplication of the data subcarrier of corresponding position in first OFDM symbol after the signal and L-SIG of second group of data subcarrier in L-SIG；

The result according to multiplication determines the information that the PPDU is carried, comprising: determines the first bit information according to the result of first group of multiplication, determines the second bit information according to the result of second group of multiplication.
Device according to claim 12 or 13, which is characterized in that the first bit information and the second bit information that the PPDU is carried are used to indicate the protocol version of the PPDU ownership.
A kind of data detection device is applied to WLAN WLAN characterized by comprising

Transmit-Receive Unit, for receiving physical layer protocol data unit PPDU；

Processing unit, for the signal of data subcarrier in first orthogonal frequency division multiplex OFDM symbol after legacy signaling field L-SIG in the PPDU to be multiplied with one or more features sequence；

The processing unit is also used to the signal after being multiplied and L-SIG doing cross correlation process；

The processing unit is also used to determine the information that the PPDU is carried according to the result of the cross correlation process.
Device according to claim 15, which is characterized in that the processing unit is by institute The signal for stating data subcarrier in first orthogonal frequency division multiplex OFDM symbol in PPDU after legacy signaling field L-SIG is multiplied with a characteristic sequence, comprising:

The signal of data subcarrier is multiplied with the characteristic sequence in first OFDM symbol after the L-SIG.
Device according to claim 15, it is characterized in that, the characteristic sequence is two, and the signal of data subcarrier in first orthogonal frequency division multiplex OFDM symbol after legacy signaling field L-SIG in the PPDU is multiplied by the processing unit with two characteristic sequences, comprising:

The signal of data subcarrier in first OFDM symbol after the L-SIG is multiplied with two characteristic sequences respectively, obtains the first scramble sequence and the second scramble sequence；

The signal by after multiplication and L-SIG do cross correlation process, comprising:

First scramble sequence and the second scramble sequence are done into cross correlation process with L-SIG respectively.
Device according to claim 17, it is characterized in that, the processing unit determines the information that the PPDU is carried according to the result of the cross correlation process, include: that the first bit information is determined according to the result that first scramble sequence and L-SIG do cross correlation process, the second bit information is determined according to the result that second scramble sequence and L-SIG do cross correlation process.
Any device of 5-18 according to claim 1, it is characterized in that, the characteristic sequence is the sequence of+1 and -1 composition, the characteristic sequence includes a bit subsequence or multiple bit subsequences, and the bit subsequence includes: [+1+1+1+1], [+1+1-1-1], [+1-1-1+1], [+1-1+1-1], [- 1-1-1-1], [- 1-1+1+1], [- 1+1+1-1] or [- 1+1-1+1].
Any device of 5-19 according to claim 1, it is characterized in that, data subcarrier number is identical as data subcarrier number in L-SIG in the characteristic sequence, in the characteristic sequence data subcarrier number with data subcarrier number is identical in first OFDM symbol after L-SIG.