CN107409432B

CN107409432B - Data transmission method, receiving end equipment and sending end equipment

Info

Publication number: CN107409432B
Application number: CN201580078596.XA
Authority: CN
Inventors: 颜敏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-05-13
Filing date: 2015-05-13
Publication date: 2020-10-09
Anticipated expiration: 2035-05-13
Also published as: CN107409432A; WO2016179807A1

Abstract

The embodiment of the invention provides a data transmission method, receiving end equipment and sending end equipment, which are applied to a Wireless Local Area Network (WLAN) of a 60GHz frequency band, and the method comprises the following steps: receiving a physical layer protocol data unit (PPDU), wherein the PPDU comprises a short training field, and the standard of the PPDU is a first standard or a second standard, wherein the short training field sequentially comprises 16 Gray sequences a and 1 Gray sequence-a when the standard of the PPDU is the first standard, or the short training field sequentially comprises the Gray sequences-a, 16 Gray sequences a and 1 Gray sequence-a when the standard of the PPDU is the second standard; performing cross correlation on the short training field and a preset Gray sequence to obtain a cross correlation result; and determining the PPDU as the PPDU of the first standard or the second standard according to the cross-correlation result. The embodiment of the invention can determine the standard of the physical frame according to the cross-correlation result and realize the automatic identification of the standard.

Description

Data transmission method, receiving end equipment and sending end equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a receiving end device and a sending end device for a data transmission method.

Background

The standardization of the 802.11 family of standards for Wireless Local Area Networks (WLANs) has resulted in significant cost reductions for WLAN technology. Wi-Fi (Wireless Fidelity, Wi-Fi) is a brand of Wireless network communication technology held by the Wi-Fi alliance for the purpose of improving interoperability between Wireless network products based on the 802.11 standards, and Wireless local area networks using the 802.11 family of protocols may be referred to as Wi-Fi networks.

Currently, versions of the 802.11 standard have evolved from 802.11a/b to 802.11g, 802.11n, 802.11ac, and so on. In order to guarantee backward compatibility and interoperability between products of different 802.11 standard versions, starting from 802.11n, a Mixed Format (MF) preamble (hereinafter referred to as preamble) is defined. The legacy field portion of the preamble is the same as the preamble field of 802.11a, and includes a legacy short training field, a legacy long training field, and a legacy signaling field. The preamble after 802.11n includes a non-legacy field portion, in addition to a legacy field portion, specifically including a non-legacy signaling field, a non-legacy short training field, a non-legacy long training field, and the like. The non-legacy field portion of 802.11n is named High Throughput (HT), i.e., the non-legacy field portion includes a High Throughput signaling field, a High Throughput short training field, and a High Throughput long training field. The non-legacy field portion of 802.11ac is named Very High Throughput (VHT), i.e., the non-legacy field portion includes a Very high throughput signaling field a, a Very high throughput short training field, a Very high throughput long training field, and a Very high throughput signaling field B. In several versions of the existing 802.11 standard, for example, 802.11a/b, 802.11g, 802.11n, and 802.11ac, the distinction of different protocol versions and the automatic detection of the receiving end can be realized by the modulation mode of the symbol after the preamble legacy field.

Whereas for existing 60GHz high frequency Wi-Fi, the existing standard is mainly 802.11 ad. The highest rate supported by the standard is 6.7Gbps, and in order to meet the requirement of higher rate, new technology and standard need to be introduced: the Next Generation 60GHz band (Next Generation 60G frequency band, NG60) standard. Since the introduction of new standards requires the requirement of backward compatibility and interoperability, how to distinguish NG60 frames (also called physical frames, physical layer packets, or physical layer Protocol Data units (PPDUs)) from 802.11ad frames in the NG60 Protocol becomes an urgent problem to be solved.

Disclosure of Invention

The embodiment of the invention provides a data transmission method, receiving end equipment and sending end equipment, which can distinguish NG60 frames from 802.11ad frames.

In a first aspect, a method for transmitting data is provided, which is applied to a wireless local area network WLAN in a 60GHz band, and includes: receiving a physical layer protocol data unit (PPDU), wherein the PPDU comprises a short training field, and the standard of the PPDU is a first standard or a second standard, wherein the short training field sequentially comprises 16 Gray sequences a and 1 Gray sequence-a when the standard of the PPDU is the first standard, or the short training field sequentially comprises 1 Gray sequence-a, 16 Gray sequences a and 1 Gray sequence-a when the standard of the PPDU is the second standard; performing cross correlation on the short training field and a preset Gray sequence to obtain a cross correlation result; and determining the PPDU as the PPDU of the first standard or the second standard according to the cross-correlation result.

With reference to the first aspect, in a first implementation manner, the determining, according to the cross-correlation result, that a PPDU of the PPDU is the first standard or the second standard includes: and determining the PPDU as the PPDU of the second standard when the cross-correlation result comprises that a negative peak exists before the coarse synchronization position of the real part of the cross-correlated signal, or determining the PPDU as the PPDU of the first standard when the cross-correlation result comprises that a negative peak does not exist before the coarse synchronization position of the real part of the cross-correlated signal.

With reference to the first possible implementation manner, in a second implementation manner, when the PPDU is a PPDU of the second standard, the result of the cross-correlation further includes that a second negative peak exists after a coarse synchronization position in a real part of the cross-correlated signal, and the method further includes: synchronizing the PPDU according to the second negative peak.

With reference to the first aspect and any one of the first to the second possible implementation manners, in a third possible implementation manner, the first standard is 802.11ad, and the second standard is a next-generation 60GHz band NG60 standard.

In a second aspect, a method for transmitting data is provided, and is applied to a wireless local area network WLAN in a 60GHz band, and includes: receiving a PPDU, wherein the PPDU comprises a short training field, and the standard of the PPDU is a first standard or a second standard, wherein the short training field sequentially comprises 48 Gray sequences b, 1 Gray sequence-b and 1 Gray sequence-a when the standard of the PPDU is the first standard, or the short training field sequentially comprises 1 Gray sequence-b, 48 Gray sequences b, 1 Gray sequence-b and 1 Gray sequence-a when the standard of the PPDU is the second standard; performing cross correlation on the short training field and a preset Gray sequence to obtain a cross correlation result; and determining the PPDU as the PPDU of the first standard or the second standard according to the cross-correlation result.

With reference to the second aspect, in a first implementation manner, the determining, according to the cross-correlation result, that the PPDU is the PPDU of the first standard or the second standard includes: and determining the PPDU as the PPDU of the second standard when the cross-correlation result comprises that a negative peak exists before the coarse synchronization position of the real part of the cross-correlated signal, or determining the PPDU as the PPDU of the first standard when the cross-correlation result comprises that a negative peak does not exist before the coarse synchronization position of the real part of the cross-correlated signal.

With reference to the first possible implementation manner of the second aspect, in a second implementation manner, when the PPDU is a PPDU of the second standard, the result of the cross-correlation further includes that a second negative peak exists after a coarse synchronization position in a real part of the cross-correlated signal, and the method further includes: synchronizing the PPDU according to the second negative peak.

With reference to the second aspect and any one possible implementation manner of the first to second possible implementation manners of the second aspect, in a third possible implementation manner, the first standard is 802.11ad, and the second standard is a next-generation 60GHz band NG60 standard.

In a third aspect, a method for transmitting data is provided, which is applied to a wireless local area network WLAN in a 60GHz band, and includes: generating a PPDU, wherein the PPDU comprises a short training field, and the standard of the PPDU is a first standard or a second standard, wherein when the standard of the PPDU is the first standard, the short training field sequentially comprises 16 Gray sequences a and 1 Gray sequence-a, or when the standard of the PPDU is the second standard, the short training field sequentially comprises 16 Gray sequences-a, 16 Gray sequences a and 1 Gray sequence-a; the PPDU is transmitted.

With reference to the third aspect, in a first implementation, the first standard is 802.11ad and the second standard is the NG60 standard.

In a fourth aspect, a method for transmitting data is provided, which is applied to a wireless local area network WLAN in a 60GHz band, and includes: generating a PPDU, wherein the PPDU comprises a short training field, and the standard of the PPDU is a first standard or a second standard, wherein the short training field sequentially comprises 48 Gray sequences b, 1 Gray sequence-b and 1 Gray sequence-a when the standard of the PPDU is the first standard, or the short training field sequentially comprises 1 Gray sequence-b, 48 Gray sequences b, 1 Gray sequence-b and 1 Gray sequence-a when the standard of the PPDU is the second standard; the PPDU is transmitted.

With reference to the fourth aspect, in a first implementation, the first standard is 802.11ad and the second standard is NG60 standard.

In a fifth aspect, a receiving end device is provided, which is applied to a wireless local area network WLAN in a 60GHz band, and includes: a receiving unit, configured to receive a PPDU, where the PPDU includes a short training field and a standard of the PPDU is a first standard or a second standard, where the short training field sequentially includes 16 golay sequences a and 1 golay sequence-a when the standard of the PPDU is the first standard, or the short training field sequentially includes golay sequences-a, 16 golay sequences a and 1 golay sequence-a when the standard of the PPDU is the second standard; the cross-correlation unit is used for cross-correlating the short training field with a preset Gray sequence to obtain a cross-correlation result; a determining unit, configured to determine that the PPDU is a PPDU of the first standard or the second standard according to the cross-correlation result.

With reference to the first possible implementation manner of the fifth aspect, in a second implementation manner, the determining unit is specifically configured to determine that the PPDU is a PPDU of the second standard when the cross-correlation result includes that a negative peak exists in a real part of the cross-correlated signal before a coarse synchronization position, or determine that the PPDU is a PPDU of the first standard when the cross-correlation result includes that a negative peak does not exist in a real part of the cross-correlated signal before a coarse synchronization position.

With reference to the first possible implementation manner of the fifth aspect, in a second implementation manner, when the PPDU is a PPDU of the second standard, the result of the cross-correlation further includes that a second negative peak exists after a coarse synchronization position of a real part of the cross-correlated signal, and the receiving end device further includes: a synchronization unit for performing synchronization of the PPDU according to the second negative peak.

With reference to the fifth aspect and any one possible implementation manner of the first to second possible implementation manners of the fifth aspect, in a third possible implementation manner, the first standard is 802.11ad, and the second standard is a next-generation 60GHz band NG60 standard.

In a sixth aspect, a receiving end device is provided, which is applied to a wireless local area network WLAN in a 60GHz band, and includes: a receiving unit, configured to receive a PPDU, where the PPDU includes a short training field and a standard of the PPDU is a first standard or a second standard, where the short training field sequentially includes 48 golay sequences b, 1 golay sequence-b and 1 golay sequence-a when the standard of the PPDU is the first standard, or the short training field sequentially includes 1 golay sequence-b, 48 golay sequences b, 1 golay sequence-b and 1 golay sequence-a when the standard of the PPDU is the second standard; the cross-correlation unit is used for cross-correlating the short training field with a preset Gray sequence to obtain a cross-correlation result; a determining unit, configured to determine that the PPDU is a PPDU of the first standard or the second standard according to the cross-correlation result.

With reference to the first possible implementation manner of the sixth aspect, in a second implementation manner, the determining unit is specifically configured to determine that the PPDU is a PPDU of the second standard when the cross-correlation result includes that a negative peak exists in a real part of the cross-correlated signal before a coarse synchronization position, or determine that the PPDU is a PPDU of the first standard when the cross-correlation result includes that a negative peak does not exist in a real part of the cross-correlated signal before a coarse synchronization position.

With reference to the first possible implementation manner of the sixth aspect, in a second implementation manner, when the PPDU is a PPDU of the second standard, the result of the cross-correlation further includes that a second negative peak exists after a coarse synchronization position of a real part of the cross-correlated signal, and the receiving end device further includes: a synchronization unit for performing synchronization of the PPDU according to the second negative peak.

With reference to the sixth aspect and any one possible implementation manner of the first to the second possible implementation manners of the sixth aspect, in a third possible implementation manner, the first standard is 802.11ad, and the second standard is a next-generation 60GHz band NG60 standard.

A seventh aspect provides a sending end device, which is applied to a wireless local area network WLAN in a 60GHz band, and includes: a generating unit, configured to generate a PPDU, where the PPDU includes a short training field and a standard of the PPDU is a first standard or a second standard, where the short training field sequentially includes 16 golay sequences a and 1 golay sequence-a when the standard of the PPDU is the first standard, or the short training field sequentially includes golay sequences-a, 16 golay sequences a and 1 golay sequence-a when the standard of the PPDU is the second standard; a sending unit, configured to send the PPDU.

With reference to the seventh aspect, in a first implementation, the first standard is 802.11ad, and the second standard is NG60 standard.

In an eighth aspect, a sending end device is provided, which is applied to a wireless local area network WLAN with a 60GHz band, and includes: a generating unit, configured to generate a PPDU, where the PPDU includes a short training field, and a standard of the PPDU is a first standard or a second standard, where the short training field sequentially includes 48 golay sequences b, 1 golay sequence-b, and 1 golay sequence-a when the standard of the PPDU is the first standard, or the short training field sequentially includes 1 golay sequence-b, 48 golay sequences b, 1 golay sequence-b, and 1 golay sequence-a when the standard of the PPDU is the second standard; a sending unit, configured to send the PPDU.

With reference to the eighth aspect, in a first implementation, the first standard is 802.11ad and the second standard is NG60 standard.

Based on the technical scheme, the short training field and the preset Golay sequence are subjected to cross correlation to obtain a cross correlation result; and determining the PPDU to be a PPDU of the first standard (e.g., 802.11ad) or the second standard (e.g., NG60) according to the cross-correlation result. The embodiment of the invention can determine the standard of the PPDU according to the cross-correlation result, and realize the recognition of NG60 frames and 802.11ad frames.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic diagram of a scenario of transmitting data to which an embodiment of the present invention is applicable.

Fig. 2 is a schematic flow chart diagram of a method of transmitting data in accordance with one embodiment of the present invention.

Fig. 3 is a schematic flow chart of a method of transmitting data according to another embodiment of the present invention.

Fig. 4 is a schematic block diagram of a PPDU of the 802.11ad standard in accordance with one embodiment of the present invention.

Fig. 5 is a schematic block diagram of a short training field in accordance with one embodiment of the present invention.

FIG. 6 is a schematic block diagram of a short training field in accordance with one embodiment of the present invention.

FIG. 7 is a schematic block diagram of signals after a correlation operation according to one embodiment of the present invention.

Fig. 8 is a schematic block diagram of signals after a correlation operation according to another embodiment of the present invention.

Fig. 9 is a schematic block diagram of signals after a correlation operation according to another embodiment of the present invention.

Fig. 10 is a schematic flow chart diagram of a method of transmitting data according to another embodiment of the present invention.

Fig. 11 is a schematic flow chart diagram of a method of transmitting data according to another embodiment of the present invention.

Fig. 12 is a schematic block diagram of a receiving-end device according to an embodiment of the present invention.

Fig. 13 is a schematic block diagram of a transmitting-end device according to an embodiment of the present invention.

Fig. 14 is a schematic block diagram of a receiving-end apparatus according to another embodiment of the present invention.

Fig. 15 is a schematic block diagram of a transmitting-end device according to another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

The technical scheme of the invention can be applied to an Orthogonal Frequency Division Multiplexing (OFDM) system, such as a WLAN system, in particular to Wireless Fidelity (WiFi) and the like; the technical method of the invention can also be applied to a Single Carrier (SC) system. Of course, the method of the embodiment of the present invention may also be applied to other types of OFDM systems, and the embodiment of the present invention is not limited herein.

Correspondingly, the sending end device and the receiving end device may be a Station (STA) in the WLAN, and the Station may also be referred to as a system, a subscriber unit, an access terminal, a mobile Station, a remote terminal, a mobile device, a User terminal, a wireless communication device, a User agent, a User Equipment, or a User Equipment (UE). The STA may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device having Wireless Local area network (e.g., Wi-Fi) communication capabilities, a computing device, or other processing device connected to a Wireless modem.

In addition, the sending end device and the receiving end device may also be Access Points (APs) in the WLAN, and the APs may be configured to communicate with the Access terminal through a wireless local area network, and transmit data of the Access terminal to the network side, or transmit data from the network side to the Access terminal.

The receiving end device may be a correspondent end corresponding to the sending end device.

For convenience of understanding and explanation, the following description is given by way of example and not limitation to the implementation and actions of the method and apparatus for transmitting data in a Wi-Fi system.

Fig. 1 is a schematic diagram of a scenario of transmitting data to which an embodiment of the present invention is applicable. The scenario system shown in fig. 1 may be a WLAN system, and the system in fig. 1 includes one or more access points AP101 and one or more stations STA102, where fig. 1 takes one access point and two stations as an example. Wireless communication between access point 101 and station 102 may be via various standards. The access point 101 and the station 102 may perform wireless communication by using a Multi-User Multiple-Input Multiple-Output (MU-MIMO) technology.

Fig. 2 is a schematic flow chart diagram of a method of transmitting data in accordance with one embodiment of the present invention. The method shown in fig. 2 is executed by a receiving end device, where the receiving end device may be a station or an access point, and when the sending end device is an access point, the receiving end device is a station; when the sending end device is a station, the receiving end device is an access point. Specifically, the method shown in fig. 2 is applied to a wireless local area network WLAN in a 60GHz band, and includes:

210, receiving a physical layer protocol data unit (PPDU), wherein the PPDU comprises a short training field, and the standard of the PPDU is a first standard or a second standard, wherein the short training field sequentially comprises 16 Gray sequences a (Ga128) and 1 Gray sequence-a (-Ga128) when the standard of the PPDU is the first standard, or the short training field sequentially comprises 1 Gray sequence-a, 16 Gray sequences a and 1 Gray sequence-a when the standard of the PPDU is the second standard;

and 220, performing cross-correlation on the short training field and a preset Gray sequence to obtain a cross-correlation result.

And 230, determining the PPDU as the PPDU of the first standard or the PPDU of the second standard according to the cross-correlation result.

Therefore, the embodiment of the invention cross-correlates the short training field with the preset Golay sequence to obtain a cross-correlation result; and determines the PPDU to be a PPDU of a first standard (e.g., 802.11ad) or a second standard (e.g., NG60) according to the cross-correlation result. The embodiment of the invention can determine the standard of the PPDU according to the cross-correlation result and realize the recognition of the NG60 frame and the 802.11ad frame.

Specifically, in a wireless local area network WLAN in a 60GHz band, in order to distinguish a PPDU of a first standard from a PPDU of a second standard, according to a difference between short training fields of two protocol versions, specifically, when the PPDU is single-carrier or multi-carrier transmission, a gray sequence-a is added to the short training field in the PPDU of the second standard more than the short training field of the first standard.

It should also be understood that the preset gray (golay) sequence may also be referred to as a local gray sequence, which may be a known sequence that is set in advance at the receiving end. The preset golay sequence may be a golay sequence a.

Fig. 3 is a schematic flow chart of a method of transmitting data according to another embodiment of the present invention. The method shown in fig. 3 is executed by a receiving end device, where the receiving end device may be a station or an access point, and when the sending end device is an access point, the receiving end device is a station; when the sending end device is a station, the receiving end device is an access point. Specifically, the method shown in fig. 3 is applied to a wireless local area network WLAN in a 60GHz band, and includes:

310, receiving a PPDU, the PPDU comprising a short training field, the standard of the PPDU being a first standard or a second standard, wherein, when the standard of the PPDU is the first standard, the short training field sequentially comprises 48 golay sequences b (Gb128), 1 golay sequence-b (-Gb128), and 1 golay sequence-a, or, when the standard of the PPDU is the second standard, the short training field sequentially comprises 1 golay sequence-b, 48 golay sequences b, 1 golay sequence-b, and 1 golay sequence-a;

and 320, performing cross correlation on the short training field and a preset Gray sequence to obtain a cross correlation result.

And 330, determining the PPDU as the PPDU of the first standard or the PPDU of the second standard according to the cross-correlation result.

Specifically, in a wireless local area network WLAN in a 60GHz band, in order to distinguish a PPDU of a first standard from a PPDU of a second standard, an embodiment of the present invention, according to a difference between short training fields of two protocol versions, specifically, when the PPDU is a control physical layer (PHY) transmission, a short training field in the PPDU of the second standard is 1 more gray sequence-b than a short training field of the first standard, and further, the embodiment of the present invention determines that the PPDU is the PPDU of the first standard or the second standard according to a result of cross-correlation between the short training field of the PPDU and a preset gray sequence, which can solve a problem in the prior art that it is difficult to distinguish the PPDUs of the first standard from the PPDU of the second standard.

It should also be understood that the preset golay sequence may also be referred to as a local golay sequence, and may be a known sequence that is set in advance at the receiving end. The preset golay sequence may be a golay sequence b.

It will be appreciated that the embodiments of figures 2 and 3 differ in that: the PPDU in the embodiment of fig. 2 is a PPDU applied to single carrier or multi-carrier transmission, the PPDU in the embodiment of fig. 3 is a PPDU applied to control physical layer transmission, and short training fields of the PPDU and the PPDU are different under the same standard, but the short training fields and preset golay sequences are cross-correlated in the same manner in both embodiments of fig. 2 and fig. 3 to obtain a cross-correlation result; and determining that the PPDU is a PPDU of the first standard or the second standard according to the cross-correlation result. Therefore, the following is described in detail mainly in the implementation of fig. 2, and the corresponding method process of the embodiment of fig. 3 can refer to the corresponding content of the embodiment of fig. 2, and the detailed description is omitted appropriately to avoid repetition.

Optionally, as another embodiment, the first standard is 802.11ad, and the second standard is a next generation 60GHz band NG60 standard.

For example, FIG. 4 is a diagram of a PPDU of the 802.11ad standard in accordance with one embodiment of the present invention. The PPDU shown in fig. 4 includes: short Training Field (STF), channel estimation Field (CE), indicator signal Field (Header), data Field (data), automatic gain control Field (AGC), and adjustment Field (TRN-R/T), wherein the STF is used for synchronization, frequency offset estimation, and AGC adjustment; the CE is used for channel estimation; the indication signal field is used for indicating an indication signal, for example, may be used for indicating a modulation scheme of the data frame; AGC denotes automatic gain control; the TRN-R/T indicates fine adjustment of a beam at a receiving or transmitting end.

In the embodiment of the present invention, in order to distinguish different PPDUs (802.11ad frame and NG60 frame) and consider compatibility, the STF structure of the NG60 frame is configured by repeating the last gray sequence once at the very front end of the STF of the existing frame structure in 11 ad.

For example, as shown in fig. 5, when the PPDU is single-carrier or multi-carrier transmission, the short training field of the PPDU of the first standard (8021.11ad) may include 16 golay sequences a and 1 golay sequence-a, and the short training field of the PPDU of the second standard (NG60) may include 1 golay sequence-a, 16 golay sequences a and 1 golay sequence-a.

As shown in fig. 6, in case of PPDU for control physical layer (PHY) transmission, the short training field of the PPDU of the first standard (8021.11ad) may include 48 golay sequences b, 1 golay sequence-b and 1 golay sequence-a, and the short training field of the PPDU of the second standard (NG60) may include 1 golay sequence-b, 48 golay sequences b, 1 golay sequence-b and 1 golay sequence-a;

it should be understood that the STF sequence can be used for the operations of synchronization and AGC adjustment, and the STF is used for synchronization, mainly using correlation operations, including autocorrelation and cross-correlation operations, and signals of the correlation operations are shown in fig. 7, wherein a dotted line in fig. 7 represents a signal amplitude diagram after autocorrelation and can be used for coarse synchronization, and a solid line represents a signal amplitude diagram after cross-correlation with a local gray sequence and uses a negative peak thereof for fine synchronization.

It should be noted that the preset golay sequence may be Ga128 when the PPDU is single-carrier or multi-carrier transmission, and Gb128 when the PPDU is control physical layer transmission.

Optionally, as another embodiment, in 230, when the cross-correlation result includes that a negative peak exists before the coarse synchronization position in the real part of the cross-correlated signal, determining the PPDU to be a PPDU of the second standard; or, when the cross-correlation result includes that the real part of the cross-correlated signal has no negative peak before the coarse synchronization position, determining the PPDU as the PPDU of the first standard.

For example, as shown in fig. 7, the cross-correlation result does not have a negative peak before the coarse synchronization position, so it can be determined that the signal amplitude diagram shown in fig. 7 corresponds to an 802.11ad frame.

Optionally, as another embodiment, when the PPDU is a PPDU of a second standard, the result of the cross-correlation further includes that a second negative peak exists after the coarse synchronization position in the real part of the cross-correlated signal,

the method of the embodiment of the invention also comprises the following steps: the PPDU synchronization is performed according to the second negative peak.

According to the embodiment of the invention, the first negative peak is used for judging the frame type (judging whether the negative peak appears before the coarse synchronization position), and the second negative peak is used for carrying out the frame synchronization operation. Meanwhile, one more negative Gray sequence exists in the NG60 frame than in the 802.11ad frame, so that the statistic is increased, and the AGC precision is improved.

Specifically, in the case of high and low Signal-to-Noise ratios (SNRs) respectively in an Additive White Gaussian Noise (AWGN) channel, signals generated when the cross-correlation operation is performed are as shown in fig. 8 and 9, where fig. 8 is a schematic diagram of a real part of a Signal in the case of a high SNR and fig. 9 is a schematic diagram of a real part of a Signal in the case of a low SNR. Where the dashed line in fig. 8 represents the real part of the signal after autocorrelation and the solid line represents the real part of the signal after cross-correlation with the local golay sequence. As can be seen from fig. 8 and fig. 9, no matter in low SNR or high SNR, two negative peaks, namely a first negative peak and a second negative peak, appear in the cross-correlation signal, wherein in the embodiment of the present invention, the first negative peak (the negative peak appearing before the coarse synchronization position)) may be used to perform the frame type determination, specifically, when the first negative peak exists, the PPDU may be determined to be an NG60 frame, and when the first negative peak does not exist, the PPDU may be determined to be an 802.11ad frame; the second negative peak for frame synchronization operation. Because the NG60 frame has more negative Gray sequences than the 802.11ad frame, the normal AGC adjustment is not influenced, and the AGC precision is improved due to the increase of the Gray sequence statistic. From the presence of the first negative peak in both fig. 8 and 9, it can be determined that the signals shown in fig. 8 and 9 correspond to NG60 frames.

While the method for transmitting data according to the embodiment of the present invention is described above from the perspective of the receiving end device with reference to fig. 1 to 9, the method for transmitting data according to the embodiment of the present invention will be described below from the perspective of the transmitting end device with reference to fig. 10 and 11.

In particular, fig. 10 is a schematic flow chart of a method of transmitting data according to another embodiment of the present invention. The method shown in fig. 10 is executed by a sending end device, where the sending end device may be a station or an access point, and when the sending end device is an access point, a receiving end device is a station; when the sending end device is a station, the receiving end device is an access point. Specifically, the method shown in fig. 10 is applied to a wireless local area network WLAN in a 60GHz band, and includes:

1010, generating a PPDU, wherein the PPDU comprises a short training field, and a standard of the PPDU is a first standard or a second standard, wherein the short training field sequentially comprises 16 gray sequences a and 1 gray sequence-a when the standard of the PPDU is the first standard, or the short training field sequentially comprises the gray sequences-a, 16 gray sequences a and 1 gray sequence-a when the standard of the PPDU is the second standard;

1020, transmitting the PPDU.

In other words, the PPDU is transmitted to the receiving-end device so that the receiving-end device determines the standard of the PPDU according to the short training field.

Therefore, the embodiment of the invention generates the PPDU and sends the PPDU to the receiving end equipment, so that the receiving end equipment can perform cross-correlation on the short training field and the preset Gray sequence to obtain a cross-correlation result; and determines the PPDU to be a PPDU of a first standard (e.g., 802.11ad) or a second standard (e.g., NG60) according to the cross-correlation result. The embodiment of the invention can determine the standard of the PPDU according to the cross-correlation result and realize the recognition of the NG60 frame and the 802.11ad frame.

Fig. 11 is a schematic flow chart diagram of a method of transmitting data according to another embodiment of the present invention. The method shown in fig. 11 is executed by a sending end device, where the sending end device may be a station or an access point, and when the sending end device is an access point, a receiving end device is a station; when the sending end device is a station, the receiving end device is an access point. Specifically, the method shown in fig. 11 is applied to a wireless local area network WLAN in a 60GHz band, and includes:

1110, generating a PPDU, where the PPDU includes a short training field, and a standard of the PPDU is a first standard or a second standard, where the short training field sequentially includes 48 golay sequences b, 1 golay sequence-b, and 1 golay sequence-a when the standard of the PPDU is the first standard, or the short training field sequentially includes 1 golay sequence-b, 48 golay sequences b, 1 golay sequence-b, and 1 golay sequence-a when the standard of the PPDU is the second standard;

1120, transmitting the PPDU.

It will be appreciated that the embodiments of figures 10 and 11 differ in that: the PPDU in the embodiment of fig. 10 is a PPDU applied to single carrier or multi-carrier transmission, and the PPDU in the embodiment of fig. 11 is a PPDU applied to control physical layer transmission, where short training fields of the PPDU and the PPDU are different under the same standard, but both embodiments of fig. 10 and 11 similarly transmit the PPDU, so that a receiving end performs cross-correlation on the short training field and a preset golay sequence to obtain a cross-correlation result; and determining that the PPDU is a PPDU of the first standard or the second standard according to the cross-correlation result. Therefore, the following is mainly described in detail with the implementation of fig. 10, and the corresponding method process of the embodiment of fig. 11 can be referred to the corresponding content of the embodiment of fig. 10, and the detailed description is omitted appropriately to avoid repetition.

It should be noted that the embodiment shown in fig. 10 corresponds to the embodiment shown in fig. 2, and the difference between the embodiments shown in the two embodiments is that the sending end device shown in fig. 10 is an opposite end device of the receiving end device shown in fig. 2, and the exchange process between the sending end device and the receiving end device in fig. 10 may refer to the embodiment shown in fig. 2, and is not described again here.

It should be further noted that the embodiment shown in fig. 11 corresponds to the embodiment shown in fig. 3, and the difference between the embodiments shown in the two embodiments is that the sending end device shown in fig. 11 is an opposite end device of the receiving end device shown in fig. 3, and the exchange process between the sending end device and the receiving end device in fig. 11 may refer to the embodiment shown in fig. 3, and is not described again here.

The method for transmitting data according to the embodiment of the present invention is described above with reference to fig. 1 to 11, and the apparatus for transmitting data according to the embodiment of the present invention is described below with reference to fig. 12 to 15.

Fig. 12 is a schematic block diagram of a receiving-end device according to an embodiment of the present invention. The method is applied to the WLAN with the frequency band of 60GHz, the receiving end equipment can be a station or an access point, and when the sending end equipment is the access point, the receiving end equipment is the station; when the sending end device is a station, the receiving end device is an access point. The receiving-end apparatus 1200 shown in fig. 12 includes: a receiving unit 1210, a cross-correlating unit 1220 and a determining unit 1230.

It should be understood that the receiving end apparatus 1200 shown in fig. 12 can implement the respective processes related to the receiving end apparatus in the method embodiments shown in fig. 1 to 11, and specific functions of the receiving end apparatus 1200 shown in fig. 12 may refer to the respective processes performed by the receiving end apparatus in fig. 1 to 11, and a detailed description is appropriately omitted here to avoid redundancy.

Specifically, when fig. 12 corresponds to the embodiment of fig. 2, the receiving unit 1210 is configured to receive a PPDU, where the PPDU includes a short training field and the standard of the PPDU is a first standard or a second standard, where the short training field sequentially includes 16 gray sequences a and 1 gray sequence-a when the standard of the PPDU is the first standard, or sequentially includes the gray sequences-a, 16 gray sequences a and 1 gray sequence-a when the standard of the PPDU is the second standard;

the cross-correlation unit 1220 is configured to perform cross-correlation between the short training field and a preset golay sequence to obtain a cross-correlation result;

the determining unit 1230 is configured to determine the PPDU as a PPDU of the first standard or the second standard according to the cross-correlation result.

When fig. 12 corresponds to the embodiment of fig. 3, the receiving unit 1310 is configured to receive a PPDU, where the PPDU includes a short training field, and the standard of the PPDU is a first standard or a second standard, where the short training field sequentially includes 48 golay sequences b, 1 golay sequence-b, and 1 golay sequence-a when the standard of the PPDU is the first standard, or sequentially includes 1 golay sequence-b, 48 golay sequences b, 1 golay sequence-b, and 1 golay sequence-a when the standard of the PPDU is the second standard;

Alternatively, as another embodiment, the determining unit 1230 is specifically configured to determine that the PPDU is a PPDU of the second standard when the cross-correlation result includes that a negative peak exists in a real part of the cross-correlated signal before the coarse synchronization position,

alternatively, the determining unit 1230 is specifically configured to determine that the PPDU is a PPDU of the first standard when the cross-correlation result includes that the real part of the cross-correlated signal has no negative peak before the coarse synchronization position.

the receiving end device further includes: and the synchronization unit is used for carrying out PPDU synchronization according to the second negative peak.

Fig. 13 is a schematic block diagram of a transmitting-end device according to an embodiment of the present invention. The method is applied to the WLAN with the frequency band of 60GHz, the sending end equipment can be a station or an access point, and when the sending end equipment is the access point, the receiving end equipment is the station; when the sending end device is a station, the receiving end device is an access point. The transmitting-end apparatus 1300 shown in fig. 13 includes: a generating unit 1310 and a transmitting unit 1320.

It should be understood that the sending-end device 1300 shown in fig. 13 can implement the respective processes related to the sending-end device in the method embodiment shown in fig. 1 to 11, and specific functions of the receiving-end device 1300 shown in fig. 13 may refer to the respective processes performed by the sending-end device in fig. 1 to 11, and a detailed description is appropriately omitted here to avoid redundancy.

Specifically, when fig. 13 corresponds to the embodiment of fig. 10, the generating unit 1310 is configured to generate a PPDU, where the PPDU includes a short training field, and a standard of the PPDU is a first standard or a second standard, where the short training field sequentially includes 16 gray sequences a and 1 gray sequence-a when the standard of the PPDU is the first standard, or sequentially includes gray sequences-a, 16 gray sequences a and 1 gray sequence-a when the standard of the PPDU is the second standard;

the transmission unit 1320 is configured to transmit PPDU.

When fig. 13 corresponds to the embodiment of fig. 11, the generating unit 1310 is configured to generate a PPDU, where the PPDU includes a short training field, and the standard of the PPDU is a first standard or a second standard, where the short training field sequentially includes 48 golay sequences b, 1 golay sequence-b, and 1 golay sequence-a when the standard of the PPDU is the first standard, or sequentially includes 1 golay sequence-b, 48 golay sequences b, 1 golay sequence-b, and 1 golay sequence-a when the standard of the PPDU is the second standard;

the transmission unit 1320 is configured to transmit PPDU.

Alternatively, as another embodiment, the first standard is 802.11ad and the second standard is NG60 standard.

Fig. 14 is a schematic block diagram of a receiving-end apparatus according to another embodiment of the present invention. The method is applied to the WLAN with the frequency band of 60GHz, the receiving end equipment can be a station or an access point, and when the sending end equipment is the access point, the receiving end equipment is the station; when the sending end device is a station, the receiving end device is an access point. The receiving-end apparatus 1400 shown in fig. 14 includes: a processor 1410, a memory 1420, a bus system 1430, and a transceiver 1440.

It should be understood that the receiving end device 1400 shown in fig. 14 corresponds to the receiving end device shown in fig. 12, and can implement the respective processes related to the receiving end device in the method embodiments shown in fig. 1 to 11, and specific functions of the receiving end device 1400 shown in fig. 14 may refer to the respective processes performed by the receiving end device in fig. 1 to 11, and a detailed description is appropriately omitted here to avoid redundancy.

Specifically, when fig. 14 corresponds to the embodiment of fig. 2, the transceiver 1440 receives a PPDU sent by a sending end device, where the PPDU includes a short training field and a standard of the PPDU is a first standard or a second standard, where the short training field sequentially includes 16 golay sequences a and 1 golay sequence-a when the standard of the PPDU is the first standard, or sequentially includes 1 golay sequence-a, 16 golay sequences a and 1 golay sequence-a when the standard of the PPDU is the second standard; the processor 1410 is configured to invoke a code stored in the memory 1420 through the bus system 1430, and perform cross-correlation between the short training field and a preset golay sequence to obtain a cross-correlation result; and determining the PPDU as the PPDU of the first standard or the second standard according to the cross-correlation result.

When fig. 14 corresponds to the embodiment of fig. 3, the transceiver 1440 receives a PPDU sent by a sending end device, where a standard of the PPDU is a first standard or a second standard, where, when the standard of the PPDU is the first standard, the short training field sequentially includes 48 golay sequences b, 1 golay sequence-b and 1 golay sequence-a, or, when the standard of the PPDU is the second standard, the short training field sequentially includes 1 golay sequence-b, 48 golay sequences b, 1 golay sequence-b and 1 golay sequence-a; the processor 1410 is configured to invoke a code stored in the memory 1420 through the bus system 1430, and perform cross-correlation between the short training field and a preset golay sequence to obtain a cross-correlation result; and determining the PPDU as the PPDU of the first standard or the second standard according to the cross-correlation result.

The method disclosed in the above embodiments of the present invention may be applied to the processor 1410, or implemented by the processor 1410. Processor 1410 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 1410. The Processor 1410 may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable Gate Array (FPGA) or other programmable logic device, discrete Gate or transistor logic device, discrete hardware component. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in a Random Access Memory (RAM), a flash Memory, a Read-Only Memory (ROM), a programmable ROM, an electrically erasable programmable Memory, a register, or other storage media that are well known in the art. The storage medium is located in a memory 1420, the processor 1410 reads the information in the memory 1420 and in combination with its hardware performs the steps of the method described above, and the bus system 1430 may include a power bus, a control bus, a status signal bus, etc. in addition to the data bus. For clarity of illustration, however, the various buses are designated in the figure as bus system 1430.

Alternatively, as another embodiment, the processor 1410 is specifically configured to determine that the PPDU is a PPDU of the second standard when the cross-correlation result includes that a negative peak exists in a real part of the cross-correlated signal before the coarse synchronization position,

alternatively, the processor 1410 is specifically configured to determine the PPDU to be a PPDU of the first standard when the cross-correlation result includes that the real part of the cross-correlated signal has no negative peak before the coarse synchronization position.

processor 1410 is also configured to synchronize the PPDU according to the second negative peak.

Fig. 15 is a schematic block diagram of a transmitting-end device according to another embodiment of the present invention. The method is applied to the WLAN with the frequency band of 60GHz, the sending end equipment can be a station or an access point, and when the sending end equipment is the access point, the receiving end equipment is the station; when the sending end device is a station, the receiving end device is an access point. The transmitting-end apparatus 1500 shown in fig. 15 includes: a processor 1510, a memory 1520, a bus system 1530, and a transceiver 1540.

It should be understood that the sending end device 1500 shown in fig. 15 corresponds to the sending end device shown in fig. 11, and can implement the respective processes related to the sending end device in the method embodiments shown in fig. 1 to 9, and specific functions of the receiving end device 1500 shown in fig. 15 may refer to the respective processes performed by the sending end device in fig. 1 to 9, and a detailed description is appropriately omitted here to avoid redundancy.

Specifically, when fig. 15 corresponds to the embodiment of fig. 10, the processor 1510 is configured to invoke a code stored in the memory 1520 through the bus system 1530 to generate a PPDU, where the PPDU includes a short training field, and the standard of the PPDU is a first standard or a second standard, where the short training field sequentially includes 16 gray sequences a and 1 gray sequence-a when the standard of the PPDU is the first standard, or sequentially includes 1 gray sequence-a, 16 gray sequences a and 1 gray sequence-a when the standard of the PPDU is the second standard;

the transceiver 1540 transmits the PPDU to the receiving-end device so that the receiving-end device determines the standard of the PPDU according to the short training field.

When fig. 15 corresponds to the embodiment of fig. 11, processor 1510 is configured to invoke code stored in memory 1520 via bus system 1530 to generate a PPDU whose standard is the first standard or the second standard, wherein the short training field sequentially includes 48 gray sequences b, 1 gray sequence-b, and 1 gray sequence-a when the standard of the PPDU is the first standard, or 1 gray sequence-b, 48 gray sequences b, 1 gray sequence-b, and 1 gray sequence-a when the standard of the PPDU is the second standard;

The method disclosed in the above embodiments of the present invention may be applied to the processor 1510 or implemented by the processor 1510. The processor 1510 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by instructions in the form of hardware, integrated logic circuits, or software in the processor 1510. The Processor 1510 may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable Gate Array (FPGA) or other programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in a Random Access Memory (RAM), a flash Memory, a Read-Only Memory (ROM), a programmable ROM, an electrically erasable programmable Memory, a register, or other storage media that are well known in the art. The storage medium is located in the memory 1520, the processor 1510 reads the information in the memory 1520, and the steps of the above method are completed in combination with the hardware thereof, and the bus system 1530 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus. For clarity of illustration, however, the various buses are designated in the figure as the bus system 1530.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

Additionally, the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be understood that in the present embodiment, "B corresponding to a" means that B is associated with a, from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.

Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by hardware, firmware, or a combination thereof. When implemented in software, the functions described above may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. Taking this as an example but not limiting: computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Furthermore, the method is simple. Any connection is properly termed a computer-readable medium. For example, if software is transmitted from a website, a server, or other remote source using a coaxial cable, a fiber optic cable, a twisted pair, a Digital Subscriber Line (DSL), or a wireless technology such as infrared, radio, and microwave, the coaxial cable, the fiber optic cable, the twisted pair, the DSL, or the wireless technology such as infrared, radio, and microwave are included in the fixation of the medium. Disk and disc, as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy Disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

In short, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for transmitting data, which is applied to a Wireless Local Area Network (WLAN) with a 60GHz frequency band, comprises the following steps:

receiving a physical layer protocol data unit (PPDU), wherein the PPDU comprises a short training field, and the standard of the PPDU is a first standard or a second standard, wherein when the standard of the PPDU is the first standard, the short training field sequentially comprises 16 Gray sequences a and 1 Gray sequence-a, and when the standard of the PPDU is the second standard, the short training field sequentially comprises 1 Gray sequence-a, 16 Gray sequences a and 1 Gray sequence-a;

performing cross correlation on the short training field and a preset Gray sequence to obtain a cross correlation result;

and determining the PPDU as the PPDU of the first standard or the second standard according to the cross-correlation result.

2. The method of claim 1,

the determining, according to the cross-correlation result, that the PPDU is a PPDU of the first standard or the second standard includes:

determining the PPDU as the PPDU of the second standard when the cross-correlation result comprises that a negative peak exists before a coarse synchronization position of a real part of the cross-correlated signal,

or, when the cross-correlation result includes that the real part of the cross-correlated signal has no negative peak before the coarse synchronization position, determining that the PPDU is the PPDU of the first standard.

3. The method of claim 2,

when the PPDU is the PPDU of the second standard, the result of the cross-correlation further comprises that a second negative peak exists after the coarse synchronization position of the real part of the cross-correlated signal,

the method further comprises the following steps: and synchronizing the PPDU according to the second negative peak.

4. The method of any of claims 1 to 3, wherein the first standard is 802.11ad and the second standard is a next generation 60GHz band NG60 standard.

5. A method for transmitting data is applied to a wireless local area network WLAN with 60GHz frequency band, and comprises

Receiving a PPDU, wherein the PPDU comprises a short training field, the standard of the PPDU is a first standard or a second standard, the short training field sequentially comprises 48 Gray sequences b, 1 Gray sequence-b and 1 Gray sequence-a when the standard of the PPDU is the first standard, and the short training field sequentially comprises 1 Gray sequence-b, 48 Gray sequences b, 1 Gray sequence-b and 1 Gray sequence-a when the standard of the PPDU is the second standard;

6. The method of claim 5,

7. The method of claim 6,

8. The method according to any of claims 5 to 7, wherein the first standard is 802.11ad and the second standard is a next generation 60GHz band NG60 standard.

9. A method for transmitting data, which is applied to a Wireless Local Area Network (WLAN) with a 60GHz frequency band, comprises the following steps:

generating a PPDU (PPDU), wherein the PPDU comprises a short training field, and the standard of the PPDU is a first standard or a second standard, the standard of the PPDU is determined according to a cross-correlation result of the short training field and a preset Gray sequence, when the standard of the PPDU is the first standard, the short training field sequentially comprises 16 Gray sequences a and 1 Gray sequence-a, and when the standard of the PPDU is the second standard, the short training field sequentially comprises 1 Gray sequence-a, 16 Gray sequences a and 1 Gray sequence-a;

and sending the PPDU.

10. The method of claim 9,

the first standard is 802.11ad and the second standard is NG60 standard.

11. A method for transmitting data, which is applied to a Wireless Local Area Network (WLAN) with a 60GHz frequency band, comprises the following steps:

generating a PPDU (PPDU), wherein the PPDU comprises a short training field, the standard of the PPDU is a first standard or a second standard, the standard of the PPDU is determined according to a cross-correlation result of the short training field and a preset Gray sequence, the short training field sequentially comprises 48 Gray sequences b, 1 Gray sequence-b and 1 Gray sequence-a when the standard of the PPDU is the first standard, and the short training field sequentially comprises 1 Gray sequence-b, 48 Gray sequences b, 1 Gray sequence-b and 1 Gray sequence-a when the standard of the PPDU is the second standard;

and sending the PPDU.

12. The method of claim 11,

the first standard is 802.11ad and the second standard is NG60 standard.

13. A receiving end device is applied to a Wireless Local Area Network (WLAN) of a 60GHz frequency band, and comprises the following components:

a receiving unit, configured to receive a PPDU, where the PPDU includes a short training field and a standard of the PPDU is a first standard or a second standard, where the short training field sequentially includes 16 golay sequences a and 1 golay sequence-a when the standard of the PPDU is the first standard, and the short training field sequentially includes 1 golay sequence-a, 16 golay sequences a and 1 golay sequence-a when the standard of the PPDU is the second standard;

the cross-correlation unit is used for cross-correlating the short training field with a preset Gray sequence to obtain a cross-correlation result;

a determining unit, configured to determine that the PPDU is a PPDU of the first standard or the second standard according to the cross-correlation result.

14. The receiving-end device according to claim 13,

the determining unit is specifically configured to determine that the PPDU is a PPDU of the second standard when the cross-correlation result includes that a negative peak exists in a real part of the cross-correlated signal before a coarse synchronization position,

or, the determining unit is specifically configured to determine that the PPDU is the PPDU of the first standard when the cross-correlation result includes that a negative peak does not exist before a coarse synchronization position of a real part of the cross-correlated signal.

15. The receiving-end device according to claim 14,

the receiving end device further includes:

a synchronization unit, configured to perform synchronization of the PPDU according to the second negative peak.

16. The receiving-end device according to any of claims 13 to 15, wherein the first standard is 802.11ad and the second standard is a next generation 60GHz band NG60 standard.

17. A receiving end device is applied to a Wireless Local Area Network (WLAN) of a 60GHz frequency band, and comprises the following components:

a receiving unit, configured to receive a PPDU, where the PPDU includes a short training field and a standard of the PPDU is a first standard or a second standard, where the short training field sequentially includes 48 golay sequences b, 1 golay sequence-b and 1 golay sequence-a when the standard of the PPDU is the first standard, and the short training field sequentially includes 1 golay sequence-b, 48 golay sequences b, 1 golay sequence-b and 1 golay sequence-a when the standard of the PPDU is the second standard;

18. The receiving-end device according to claim 17,

19. The receiving-end device of claim 18,

the receiving end device further includes:

20. The receiving-end device according to any of claims 17 to 19, wherein the first standard is 802.11ad, and the second standard is a next generation 60GHz band NG60 standard.

21. A sending end device is applied to a Wireless Local Area Network (WLAN) of a 60GHz frequency band, and comprises:

a generating unit, configured to generate a PPDU, where the PPDU includes a short training field and a standard of the PPDU is a first standard or a second standard, where the standard of the PPDU is determined according to a cross-correlation result of the short training field and a preset gray sequence, and when the standard of the PPDU is the first standard, the short training field sequentially includes 16 gray sequences a and 1 gray sequence-a, and when the standard of the PPDU is the second standard, the short training field sequentially includes 1 gray sequence-a, 16 gray sequences a and 1 gray sequence-a;

a sending unit, configured to send the PPDU.

22. The sender device of claim 21,

the first standard is 802.11ad and the second standard is NG60 standard.

23. A sending end device is applied to a Wireless Local Area Network (WLAN) of a 60GHz frequency band, and comprises:

a generating unit, configured to generate a PPDU, where the PPDU includes a short training field and a standard of the PPDU is a first standard or a second standard, where the standard of the PPDU is determined according to a cross-correlation result of the short training field and a preset gray sequence, and when the standard of the PPDU is the first standard, the short training field sequentially includes 48 gray sequences b, 1 gray sequence-b, and 1 gray sequence-a, and when the standard of the PPDU is the second standard, the short training field sequentially includes 1 gray sequence-b, 48 gray sequences b, 1 gray sequence-b, and 1 gray sequence-a;

a sending unit, configured to send the PPDU.

24. The sender device of claim 23,

the first standard is 802.11ad and the second standard is NG60 standard.