CN106572042B

CN106572042B - Method and device for transmitting data

Info

Publication number: CN106572042B
Application number: CN201510647929.8A
Authority: CN
Inventors: 吴涛
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-10-09
Filing date: 2015-10-09
Publication date: 2020-03-31
Anticipated expiration: 2035-10-09
Also published as: WO2017059719A1; CN106572042A

Abstract

The embodiment of the invention provides a method and equipment for transmitting data in a wireless local area network, wherein the method comprises the following steps: dividing a data group in a data block BLK of an initial physical layer protocol data unit PPDU to be transmitted by adopting a single carrier into L initial sub-blocks, wherein the BLK comprises the data group and a guard interval GI; determining a phase rotation signal for each of the L initial sub-blocks; multiplying the data symbol of each initial sub-block by the phase rotation signal of each initial sub-block to obtain a target sub-block of each initial sub-block; combining the target sub-blocks of the L initial sub-blocks and the GI to obtain a target BLK, wherein the peak-to-average ratio of the frequency domain data after the target BLK is transformed to the frequency domain is smaller than the peak-to-average ratio of the frequency domain data after the BLK is transformed to the frequency domain; and generating a target PPDU according to the target BLK and transmitting the target PPDU. The embodiment of the invention can improve the accuracy of data transmission and the performance of the system.

Description

Method and device for transmitting data

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to a method and equipment for transmitting data.

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. Products that employ Wireless Fidelity (Wi-Fi) Wireless communication technology need to pass Wi-Fi alliance authentication in order to improve interoperability between Wireless network products based on the 802.11 standard, and Wireless local area networks using the 802.11 series of protocols may be referred to as Wi-Fi networks.

At present, the 802.11 standard, which is subject to various versions such as 802.11a,802.11b,802.11g,802.11n and 802.11ac, has more and more mature technical development, the transmission speed of the provided system is also more and more increased, and the 802.11ac which operates in the 5GHz band can support 1.3Gbps at most at present. On the other hand, due to its peculiar flexibility, it finds more and more applications in domestic and commercial environments.

The 802.11ad is a branch of an IEEE 802.11 (or called WLAN, wireless local area network) system, works in a 60GHz high frequency band, is mainly used for realizing transmission of wireless high-definition audio and video signals inside a home, and brings a more complete high-definition video solution for home multimedia application, also called WiGig (60GHz Wi-Fi). Compared with the current WiFi technology, the 802.11ad technology has the characteristics of high capacity, high speed (the highest transmission rate can reach 7Gbps when the PHY adopts an OFDM multi-carrier scheme, and the highest transmission rate can reach 4.6Gbps when a single-carrier modulation scheme is adopted), low delay, low power consumption and the like in the aspect of multimedia application.

The existing single carrier system respectively performs the following processing at the transmitting end and the receiving end:

at the transmitting end, the information bits to be transmitted are processed as follows: coding and modulating; dividing the data symbols after coding modulation into blocks, wherein the length of the symbols in each block is N; a cyclic prefix (cp) is added, for example, a Guard Interval (GI), and the data block to which the cp is added is transmitted.

At the receiving end, after receiving the transmission signal passing through the wireless fading channel, the specific receiving flow is as follows: partitioning the received data; deleting the cyclic prefix in each block; performing FFT (fast Fourier transform) on the data group from which the cyclic prefix is deleted, and transforming the data group to a frequency domain; carrying out frequency domain equalization processing on the data transformed to the frequency domain by using frequency domain channel information, and transforming the data subjected to the frequency domain equalization back to a time domain by IFFT; and demodulating and decoding the time domain signal.

The following problems exist in the existing single carrier frequency domain equalization processing algorithm, and a frequency domain channel has the characteristic of selective fading: the channel energy on some subcarriers is low and the channel energy on some subcarriers is high. And the signal energy of the frequency domain signals transformed to the frequency domain is low on some subcarriers and high on some subcarriers. The received signal is the result of multiplying the frequency domain channel and the frequency domain signal without considering noise. Therefore, in some special cases, a low-energy frequency-domain signal is transmitted on a subcarrier with high channel energy, or a high-energy frequency-domain signal is transmitted on a subcarrier with low channel energy. In this case, the frequency domain signal cannot be reliably recovered, thereby affecting the performance of the entire system.

Therefore, how to improve the data transmission accuracy and improve the system performance becomes an urgent problem to be solved.

Disclosure of Invention

The embodiment of the invention provides a method and equipment for transmitting data, which can improve the accuracy of data transmission and the performance of a system.

In a first aspect, a method for data transmission in a wireless local area network is provided, including: dividing a data group in a data block BLK of an initial physical layer protocol data unit PPDU to be transmitted by adopting a single carrier into L initial sub-blocks, wherein L is more than or equal to 2, and the BLK comprises the data group and a guard interval GI;

determining a phase rotation signal for each of the L initial sub-blocks;

multiplying the data symbol of each initial sub-block by the phase rotation signal of each initial sub-block to obtain a target sub-block of each initial sub-block;

combining the target sub-blocks of the L initial sub-blocks and the GI to obtain a target BLK, wherein the peak-to-average ratio of the frequency domain data of the target BLK after being transformed to the frequency domain is smaller than the peak-to-average ratio of the frequency domain data of the BLK after being transformed to the frequency domain;

and generating a target PPDU according to the target BLK, and sending the target PPDU to receiving end equipment.

With reference to the first aspect, in a first possible implementation manner, the dividing a data group in a data block BLK of an initial physical layer protocol data unit PPDU to be transmitted using a single carrier into L initial sub-blocks includes:

sequentially dividing the data group to obtain the L initial sub-blocks;

alternatively, the first and second electrodes may be,

interleaving and dividing the data group to obtain the L initial sub-blocks;

alternatively, the first and second electrodes may be,

and randomly partitioning the data group to obtain the L initial sub-blocks, wherein the data symbols contained in each initial sub-block are randomly obtained from the data group, and the data symbols contained in different initial sub-blocks are not repeated.

With reference to the first aspect or the first possible implementation manner, in a second possible implementation manner, the determining a phase rotation signal of each of the L initial sub-blocks includes:

and determining a candidate phase rotation signal group from the plurality of groups of phase rotation signals, and selecting the phase rotation signal of each initial sub-block in the L initial sub-blocks from the candidate phase rotation signal group so that the peak-to-average ratio of frequency domain data transformed into a frequency domain by data obtained by multiplying the L initial sub-blocks by the corresponding phase rotation signals is minimum.

With reference to the second possible implementation manner, in a third possible implementation manner, the multiple sets of phase rotation signals include: e.g. of the type^j*(0*π),e^j*(0.5*π),e^j*(1*π),e^j*(1.5*π)And e^j*(0.25*π),e^j*(0.75*π),e^j*(1.25*π),e^j*(1.75*π)。

With reference to the first aspect, and any one of the first to third possible implementation manners, in a fourth possible implementation manner, a pilot symbol is located at a reserved symbol position of a target sub-block of each initial sub-block, where the pilot symbol on the reserved symbol of the first target sub-block is used to estimate a phase rotation signal of the first initial sub-block, and pilot symbols of other target sub-blocks are used to estimate a phase difference between a phase rotation signal of the corresponding initial sub-block and a phase rotation signal of a previous initial sub-block, so that a receiving end estimates the phase rotation signal of each initial sub-block according to the pilot signal of the initial sub-block.

With reference to the first aspect, and any one of the first to the third possible implementation manners, in a fifth possible implementation manner, a reserved symbol position of the target sub-block of each initial sub-block has a pilot symbol, and the pilot symbol is used by the receiving end to determine a phase rotation signal of each initial sub-block.

With reference to the first aspect and any one of the first to third possible implementation manners, in a sixth possible implementation manner, a first pilot symbol is transmitted at a reserved symbol position of a first target sub-block in all target sub-blocks, where the first pilot symbol is used to estimate a phase rotation signal of the first initial sub-block, and a known transform of the first pilot symbol is transmitted at a reserved symbol position of other target sub-blocks except the first target sub-block in all target sub-blocks, and the known transform is used by a receiving end to estimate phase rotation signals of other initial sub-blocks according to the transform.

With reference to the first aspect, or any one of the first to the third possible implementation manners, in a seventh possible implementation manner, the indication information of the phase rotation signals of all the initial sub-blocks is transmitted in the transmission data in one of all the target sub-blocks, and the indication information is used by the receiving end to determine the phase rotation signals of all the initial sub-blocks.

With reference to the second or third possible implementation manner, in an eighth possible implementation manner, the data in the target BLK is a real signal or an imaginary signal, and the sets of phase rotation signals include: a set of real phase rotation signals and a set of imaginary phase rotation signals, wherein the set of candidate phase rotation signals is the set of real phase rotation signals when the data in the target BLK is a real signal, and the set of candidate phase rotation signals is the set of imaginary phase rotation signals when the data in the target BLK is an imaginary signal.

With reference to the first aspect or the first possible implementation manner, in a ninth possible implementation manner, the determining a phase rotation signal of each of the L initial sub-blocks includes:

and determining the phase rotation signals of all the initial sub-blocks to be preset fixed values.

With reference to the first aspect or the first possible implementation manner, in a tenth possible implementation manner, the determining a phase rotation signal of each of the L initial sub-blocks includes:

the phase rotation signals of all the initial sub-blocks are obtained by sequentially selecting from a preset set according to a preset rule.

With reference to the tenth possible implementation manner, in an eleventh possible implementation manner, when L is 2, the preset set includes { [ 11 ], [ 1-1 ], [1 j ], [1-j ] }.

In a second aspect, a method for transmitting data in a wireless local area network is provided, including:

receiving a target PPDU, wherein a data group in a target data block BLK of the target PPDU comprises L target sub-blocks, and L is greater than or equal to 2;

determining a phase rotation signal of an initial sub-block corresponding to each of the L target sub-blocks, wherein each target sub-block is a product of the phase rotation signals of the initial sub-block and the initial sub-block;

and multiplying the data symbol in each target sub-block in the target BLK of the target PPDU after the frequency domain equalization is completed by the conjugate signal of the corresponding initial sub-block phase rotation signal to obtain the time domain signal of the target BLK.

With reference to the second aspect, in a first possible implementation manner, the determining a phase rotation signal of an initial sub-block corresponding to each of the L target sub-blocks includes:

estimating phase rotation signals of all initial sub-blocks according to pilot signals of all target sub-blocks, wherein the phase rotation signal of a first initial sub-block is estimated according to pilot symbols of the first target sub-block; and estimating the difference value of the phase rotation signal of the corresponding initial sub-block and the phase rotation signal of the previous initial sub-block according to the pilot symbols of other target sub-blocks, and determining the phase rotation signals of other initial sub-blocks according to the difference value and the phase rotation signal of the first initial sub-block.

With reference to the second aspect, in a second possible implementation manner, the determining a phase rotation signal of an initial sub-block corresponding to each of the L target sub-blocks includes:

and estimating the phase rotation signal of the initial sub-block corresponding to each target sub-block according to the pilot symbols of each target sub-block.

With reference to the second aspect, in a third possible implementation manner, the determining a phase rotation signal of an initial sub-block corresponding to each of the L target sub-blocks includes:

estimating phase rotation signals of all initial sub-blocks according to pilot signals of all target sub-blocks, wherein the phase rotation signals of a first initial sub-block in all initial sub-blocks are estimated according to a first pilot symbol of the first target sub-block in all target sub-blocks; and estimating a transformation form of the phase rotation signal of the corresponding initial sub-block relative to the phase rotation signal of the first initial sub-block according to the pilot symbols of other target sub-blocks, and determining the phase rotation signals of other initial sub-blocks according to the transformation form and the phase rotation signal of the first initial sub-block.

With reference to the second aspect, in a fourth possible implementation manner, the determining a phase rotation signal of an initial sub-block corresponding to each of the L target sub-blocks includes:

and determining the phase rotation signals of all the initial sub-blocks according to the indication information of the phase rotation signals of all the initial sub-blocks transmitted in one of all the target sub-blocks.

With reference to the second aspect, in a fifth possible implementation manner, the determining a phase rotation signal of an initial sub-block corresponding to each of the L target sub-blocks includes:

and determining the phase rotation signal of the initial sub-block according to the type of the data in the BLK in the target PPDU, wherein when the data in the BLK in the target PPDU is a real number signal, the phase rotation signal of the initial sub-block is determined to be one of the real number phase selection signal groups, and when the data in the BLK in the target PPDU is an imaginary number signal, the phase rotation signal of the initial sub-block is determined to be one of the imaginary number phase selection signal groups.

With reference to the second aspect, in a sixth possible implementation manner, the determining a phase rotation signal of an initial sub-block corresponding to each of the L target sub-blocks includes:

and determining a preset fixed value as the phase rotation signal of the initial sub-block.

With reference to the second aspect, in a seventh possible implementation manner, the determining a phase rotation signal of an initial sub-block corresponding to any one of the L target sub-blocks includes:

and sequentially selecting the phase rotation signals of all the initial sub-blocks from a preset set according to a preset rule.

With reference to the seventh possible implementation manner of the second aspect, in an eighth possible implementation manner, when L is 2, the preset set includes { [ 11 ], [ 1-1 ], [1 j ], [1-j ] }.

In a third aspect, an apparatus for transmitting data in a wireless local area network is provided, including:

a dividing unit, configured to divide a data group in a data block BLK of an initial physical layer protocol data unit PPDU to be transmitted by a single carrier into L initial sub-blocks, where L is greater than or equal to 2, where the BLK includes the data group and a guard interval GI;

a determining unit for determining a phase rotation signal of each of the L initial sub-blocks;

an obtaining unit, configured to multiply the data symbol of each initial sub-block with the phase rotation signal of each initial sub-block to obtain a target sub-block of each initial sub-block;

a combining unit, configured to combine a target sub-block of the L initial sub-blocks and the GI to obtain a target BLK, where a peak-to-average ratio of frequency domain data after the target BLK is transformed to a frequency domain is smaller than a peak-to-average ratio of frequency domain data after the BLK is transformed to the frequency domain;

and the sending unit is used for generating the target PPDU according to the target BLK and sending the target PPDU to the receiving end equipment.

With reference to the third aspect, in a first possible implementation manner, the dividing unit sequentially divides the data group to obtain the L initial sub-blocks;

alternatively, the first and second electrodes may be,

interleaving and dividing the data group to obtain the L initial sub-blocks;

alternatively, the first and second electrodes may be,

With reference to the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner, the determining unit determines a candidate phase rotation signal group from among a plurality of sets of phase rotation signals, and selects a phase rotation signal of each of the L initial sub-blocks from among the candidate phase rotation signal group, so that a peak-to-average ratio of frequency domain data transformed into a frequency domain by data obtained by multiplying the L initial sub-blocks by corresponding phase rotation signals is minimized.

With reference to the second possible implementation manner of the third aspect, in a third possible implementation manner, the multiple sets of phase rotation signals include: e.g. of the type^j*(0*π),e^j*(0.5*π),e^j*(1*π),e^j*(1.5*π)And e^j*(0.25*π),e^j*(0.75*π),e^j*(1.25*π),e^j ^*(1.75*π)。

With reference to the third aspect and any one of the first to third possible implementation manners of the third aspect, in a fourth possible implementation manner, a pilot symbol is located at a reserved symbol position of a target sub-block of each initial sub-block, where the pilot symbol on the reserved symbol of the first target sub-block is used to estimate a phase rotation signal of the first initial sub-block, and pilot symbols of other target sub-blocks are used to estimate a phase difference value between a phase rotation signal of the corresponding initial sub-block and a phase rotation signal of a previous initial sub-block, so that a receiving end estimates the phase rotation signal of each initial sub-block according to the pilot signal of the initial sub-block.

With reference to the third aspect and any one of the first to third possible implementation manners of the third aspect, in a fifth possible implementation manner, a reserved symbol position of the target sub-block of each initial sub-block has a pilot symbol, and the pilot symbol is used by the receiving end to determine a phase rotation signal of each initial sub-block.

With reference to the third aspect and any one of the first to third possible implementation manners of the third aspect, in a sixth possible implementation manner, a first pilot symbol is transmitted at a reserved symbol position of a first target sub-block in all target sub-blocks, where the first pilot symbol is used to estimate a phase rotation signal of the first initial sub-block, and a known transform of the first pilot symbol is transmitted at a reserved symbol position of other target sub-blocks except the first target sub-block in all target sub-blocks, where the known transform is used by a receiving end to estimate phase rotation signals of other initial sub-blocks according to the transform.

With reference to the third aspect and any one of the first to third possible implementation manners of the third aspect, in a seventh possible implementation manner, indication information of phase rotation signals of all initial sub-blocks is transmitted in transmission data in one of all target sub-blocks, and the indication information is used by a receiving end to determine the phase rotation signals of all initial sub-blocks.

In an eighth possible implementation manner, in combination with the second or third possible implementation manner, the data in the target BLK is a real signal or an imaginary signal,

the plurality of sets of phase rotation signals includes: a set of real phase rotation signals and a set of imaginary phase rotation signals, wherein the set of candidate phase rotation signals is the set of real phase rotation signals when the data in the target BLK is a real signal, and the set of candidate phase rotation signals is the set of imaginary phase rotation signals when the data in the target BLK is an imaginary signal.

With reference to the third aspect or the first possible implementation manner of the third aspect, in a ninth possible implementation manner, the determining unit determines that the phase rotation signals of all initial sub-blocks are a preset fixed value.

With reference to the third aspect or the first possible implementation manner of the third aspect, in a tenth possible implementation manner, the determining unit determines that the phase rotation signals of all the initial sub-blocks are obtained by sequentially selecting from a preset set according to a preset rule.

With reference to the tenth possible implementation manner of the third aspect, in an eleventh possible implementation manner, when L is 2, the preset set includes { [ 11 ], [ 1-1 ], [1 j ], [1-j ] }.

In a fourth aspect, an apparatus for transmitting data for a wireless local area network is provided, including:

a receiving unit, configured to receive a target PPDU, where a data group in a target data block BLK of the target PPDU includes L target sub-blocks, and L is greater than or equal to 2;

a determining unit, configured to determine a phase rotation signal of an initial sub-block corresponding to each of the L target sub-blocks, where each target sub-block is a product of the phase rotation signals of the initial sub-block and the initial sub-block;

and the acquisition unit is used for multiplying the data symbol in each target sub-block in the target BLK of the target PPDU after the frequency domain equalization is completed by the conjugate signal of the corresponding initial sub-block phase rotation signal to obtain the time domain signal of the target BLK.

With reference to the fourth aspect, in a first possible implementation manner, the determining unit estimates phase rotation signals of all initial sub-blocks according to pilot signals of all target sub-blocks, wherein the phase rotation signal of a first initial sub-block is estimated according to pilot symbols of the first target sub-block; and estimating the difference value of the phase rotation signal of the corresponding initial sub-block and the phase rotation signal of the previous initial sub-block according to the pilot symbols of other target sub-blocks, and determining the phase rotation signals of other initial sub-blocks according to the difference value and the phase rotation signal of the first initial sub-block.

With reference to the fourth aspect, in a second possible implementation manner, the determining unit estimates the phase rotation signal of the initial sub-block corresponding to each target sub-block according to the pilot symbol of each target sub-block.

With reference to the fourth aspect, in a third possible implementation manner, the determining unit estimates phase rotation signals of all initial sub-blocks according to pilot signals of all target sub-blocks, wherein the phase rotation signal of a first initial sub-block of all initial sub-blocks is estimated according to a first pilot symbol of the first target sub-block of all target sub-blocks; and estimating a transformation form of the phase rotation signal of the corresponding initial sub-block relative to the phase rotation signal of the first initial sub-block according to the pilot symbols of other target sub-blocks, and determining the phase rotation signals of other initial sub-blocks according to the transformation form and the phase rotation signal of the first initial sub-block.

With reference to the fourth aspect, in a fourth possible implementation manner, the determining unit determines the phase rotation signals of all initial sub-blocks according to the indication information of the phase rotation signals of all initial sub-blocks transmitted in one of all target sub-blocks.

With reference to the fourth aspect, in a fifth possible implementation manner, the determining unit determines the phase rotation signal of the initial sub-block according to a type of data in the BLK in the target PPDU, where when the data in the BLK in the target PPDU is a real number signal, the phase rotation signal of the initial sub-block is determined to be one of a real number phase selection signal group, and when the data in the BLK in the target PPDU is an imaginary number signal, the phase rotation signal of the initial sub-block is determined to be one of an imaginary number phase selection signal group.

With reference to the fourth aspect, in a sixth possible implementation manner, the determining unit determines a preset fixed value as the phase rotation signal of the initial sub-block.

With reference to the fourth aspect, in a seventh possible implementation manner, the determining unit sequentially selects the phase rotation signals of all the initial sub-blocks from the preset set according to a preset rule.

With reference to the fourth aspect, in an eighth possible implementation manner, when L is 2, the preset set includes { [ 11 ], [ 1-1 ], [1 j ], [1-j ] }.

Based on the above technical solution, the embodiment of the present invention divides the data group into a plurality of initial sub-blocks, determines the phase rotation signal of each initial sub-block, and sends the target sub-block obtained by multiplying the data symbol of each initial sub-block and the phase rotation signal of each initial sub-block to the receiving end device. The peak-to-average ratio of the frequency domain data of the data block is reduced, so that a receiving end can reliably recover the frequency domain signal, and the accuracy of data transmission and the performance of a system are improved.

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 diagram illustrating the structure of a PPDU in a conventional 802.11 ad.

Fig. 4 is a schematic diagram of a data block BLK in a conventional 802.11 ad.

FIG. 5 is a schematic diagram of a data set structure according to one embodiment of the invention.

Fig. 6 is a schematic structural diagram of a data set according to another embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a data set according to another embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a data set according to another embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a data set according to another embodiment of the present invention.

Fig. 10 is a schematic structural diagram of a data set according to another embodiment of the present invention.

Fig. 11 is a schematic structural diagram of a data set according to another embodiment of the present invention.

Fig. 12 is a schematic structural diagram of a data set according to another embodiment of the present invention.

Fig. 13 is a schematic flow chart diagram of a method of transmitting data according to another embodiment of the present invention.

Fig. 14 is a schematic block diagram of an apparatus for data transmission according to one embodiment of the present invention.

Fig. 15 is a schematic block diagram of an apparatus for data transmission according to another embodiment of the present invention.

Fig. 16 is a schematic block diagram of an apparatus for data transmission according to another embodiment of the present invention.

Fig. 17 is a schematic block diagram of an apparatus for data transmission 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.

Fig. 2 is a schematic flow chart of a method of transmitting data for a wireless local area network according to one embodiment of the present invention. The method shown in fig. 2 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. 2 includes:

210, dividing a data group in a data block BLK of an initial physical layer protocol data unit PPDU to be transmitted by adopting a single carrier into L initial sub-blocks, wherein L is greater than or equal to 2, and the BLK comprises the data group and a guard interval GI;

220, determining a phase rotation signal for each of the L initial sub-blocks;

230, multiplying the data symbol of each initial sub-block by the phase rotation signal of each initial sub-block to obtain a target sub-block of each initial sub-block;

240, combining the target sub-blocks of the L initial sub-blocks with the GI to obtain a target BLK, wherein the peak-to-average ratio of the frequency domain data after the target BLK is transformed to the frequency domain is smaller than the peak-to-average ratio of the frequency domain data after the target BLK is transformed to the frequency domain;

and 250, generating a target PPDU according to the target BLK, and transmitting the target PPDU to the receiving end equipment.

Therefore, the embodiment of the present invention divides the data group into a plurality of initial sub-blocks, determines the phase rotation signal of each initial sub-block, and sends the target sub-block obtained by multiplying the data symbol of each initial sub-block and the phase rotation signal of each initial sub-block to the receiving end device. The peak-to-average ratio of the frequency domain data of the data block is reduced, so that a receiving end can reliably recover the frequency domain signal, and the accuracy of data transmission and the performance of a system are improved.

It should be understood that, in the embodiment of the present invention, the target sub-blocks of the L initial sub-blocks and the GI may be combined to obtain the target BLK, that is, a new target BLK may be generated again, and then the target PPDU is generated according to the target BLK, for example, the target BLK replaces the corresponding BLK in the initial PPDU to generate the target PPDU.

In the embodiment of the present invention, in the initial PPDU, the target sub-block of each initial sub-block may replace each initial sub-block to obtain the target BLK, and further obtain the target PPDU.

In other words,

steps

240 and 250 may also be described as replacing each initial sub-block with a target sub-block of each initial sub-block, obtaining a target PPDU; and transmitting the target PPDU to the receiving end equipment.

It should be understood that the physical layer Protocol Data Unit in the embodiment of the present invention, i.e., a Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU), may also be referred to as a physical layer Protocol Data Unit frame in 802.11 ad. The embodiments of the present invention are not limited thereto.

It should be understood that the PPDU in the embodiments of the present invention may meet the 802.11ad standard operating in the 60GHz band.

For example, FIG. 3 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. 3 includes: short Training Field (STF), channel estimation Field (CE), indicator signal Field (Header), Data Field (Data), etc., wherein the STF is used for synchronization, frequency offset estimation, and Automatic Gain Control (AGC) adjustment; the CE is used for channel estimation; the indication signal field is used to indicate an indication signal, and may be used to indicate a modulation scheme of the data frame, for example.

It should also be understood that the Data block in the embodiment of the present invention may be a Data block in a Header or a Data block in Data, and the embodiment of the present invention does not limit this.

For example, both the Header and Data portions of a PPDU in the 802.11ad standard are made up of several BLOCKs of Data (BLOCK, BLK). As shown in fig. 4, each BLK is composed of a DATA group (DATA) composed of 448 symbols (symbols) and a guard interval GI composed of 64 symbols (symbols).

Optionally, as another embodiment, in 210, the data group may be sequentially divided to obtain L initial sub-blocks;

or interleaving and dividing the data group to obtain L initial sub-blocks;

or, the data group is divided randomly to obtain L initial sub-blocks, wherein the data symbols contained in each initial sub-block are randomly obtained from the data group, and the data symbols contained in different initial sub-blocks are not repeated.

For example, the DATA part in a BLK is denoted as s_t(n),n＝0,1,…,N _t1, corresponding to 802.11ad, the data set consists of 448 symbols, i.e., Nt 448. Will s_t(n) is divided into L subblocks (initial subblocks), each being

The specific division method comprises three methods:

uniform segmentation, taking Nt as 448, taking two sub-blocks as an example, sequentially:

first sub-block

Second sub-block

Interleaving and dividing, similarly taking Nt as 448, taking two sub-blocks as an example, sequentially:

first sub-block

Second sub-block

And (4) random partitioning, wherein the data symbols contained in each sub-block are randomly generated, and the data symbols contained in different sub-blocks are not repeated. Similarly, take Nt as 448, which is divided into two sub-blocks, n₁,n₂Are all distributed in [0,4 ]47]A random integer in between, and n₁And n₂And is not repeated.

First sub-block

Second sub-block

It should be understood that, in the above example, each initial sub-block has the same size, but in the embodiment of the present invention, the data group may be uniformly divided into L initial sub-blocks or non-uniformly divided, in other words, the L initial sub-blocks may have the same size or different sizes, which is not limited in the embodiment of the present invention.

Further, as another embodiment, in 220, a candidate phase rotation signal group is determined from the plurality of phase rotation signals, and the phase rotation signal of each of the L initial sub-blocks is selected from the candidate phase rotation signal group, so that the peak-to-average ratio of the frequency domain data transformed from the data obtained by multiplying the L initial sub-blocks by the corresponding phase rotation signals respectively to the frequency domain is minimized.

Specifically, in the embodiment of the present invention, as shown in fig. 5, a data Block (BLK) transmitted using a single carrier is divided, wherein a data group in each BLK is divided into L initial sub-blocks, and a data symbol in each initial sub-block is multiplied by a specific phase rotation signal

The peak-to-average ratio of the frequency domain signal transformed to the frequency domain is reduced. The specific description is as follows:

multiplying the data on each sub-block by a particular phase rotation signal to obtain a target sub-block, wherein the target sub-block is determined according to the following formula,

wherein the content of the first and second substances,

indicating the L-th initial sub-block among the L initial sub-blocks,

a phase rotation signal representing the l initial sub-block,

representing a target sub-block of the L-th initial sub-block among the L initial sub-blocks.

The data (target BLK) multiplied by the phase is transformed to the frequency domain to obtain frequency domain data s of the target BLK_f(k) K is 0, …, N-1, wherein N is N_t+N_g，N_gFor the GI length, there are two specific ways:

for the sequence with the length of N

Performing an FFT transformation in which

A transmission sequence in which data on each sub-block is multiplied by a specific phase rotation signal,

is of length N_gAll 0 sequences of (a);

for the sequence with the length of N

Performing FFT transform, wherein gi is length N_gThe GI sequence of (a);

finding the optimal phase rotation signal

Let s_f(k) Wherein the peak-to-average ratio is defined as follows:

where PAPR represents a peak-to-average ratio,

representing averaging a.

Optionally, as another embodiment, the plurality of sets of phase rotation signals may include: e.g. of the type^j*(0*π),e^j*(0 _. ^5*π),e^j*(1*π),e^j*(1.5*π)And e^j*(0.25*π),e^j*(0.75*π),e^j*(1.25*π),e^j*(1.75*π)。

Specifically, to improve the phase in the phase rotation signal at the receiving end: phi is a₁,φ₂,φ₃,…,φ_LThe accuracy of the estimation can be chosen from a fixed set₁,φ₂,φ₃,…,φ_LThe value of (c). For example, the degree may be selected from the set (0, 180) degree, or may be selected from the set (0, 90, 180, 270) degree. Further, we can select the phase from 0 degree to 359 degrees by 1 degree step size, and then get the phase selection signal. In the preferred embodiment, the phase selection signal may be from set e^j*(0*π),e^j*(0 _. ^5*π),e^j*(1*π),e^j*(1.5*π)And e^j*(0.25*π),e^j*(0.75*π),e^j*(1.25*π),e^j*(1.75*π)The embodiments of the present invention are not limited thereto.

In the receiver processing, in order to eliminate the influence on the receiving processing after the phase rotation signal is introduced, the receiver side performs the following processing:

and carrying out frequency domain equalization processing on the received data in one target BLK, and multiplying the data in each target sub-block corresponding to the time domain signal in the target BLK by the conjugate signal of the corresponding rotating signal respectively so as to eliminate the influence of the phase rotating signal. Specifically, the influence of the phase rotation signal can be eliminated according to the following formula:

wherein

Is the first targetThe time domain signal after completing the frequency domain equalization corresponding to the block position,

is the conjugate of the phase rotated signal of the first initial sub-block,

the signal is a time domain signal corresponding to the ith target sub-block.

Different embodiments are provided for how to transmit and receive the phase-rotated signals of different initial sub-blocks, which are described in detail below.

Optionally, as another embodiment, a pilot symbol is located at a reserved symbol position of the target sub-block of each initial sub-block, where the pilot symbol on the reserved symbol of the first target sub-block is used to estimate the phase rotation signal of the first initial sub-block, and the pilot symbols of other target sub-blocks are used to estimate a phase difference value between the phase rotation signal of the corresponding initial sub-block and the phase rotation signal of the previous initial sub-block, so that the receiving end estimates the phase rotation signal of each initial sub-block according to the pilot signal of the initial sub-block.

For example, as shown in FIG. 6, the transmitting end divides the data group in a BLK into L initial sub-blocks, each of which is multiplied by a specific phase rotation signal

Obtaining a target sub-block, wherein the phase rotation signal of the first initial sub-block can be 1 or other known value;

transmitting M pilot symbols at reserved symbol positions in each target sub-block for the receiver to estimate the phase rotation signal corresponding to each target sub-block, e.g., the pilot symbols of the first target sub-block to the Lth target sub-block may be d₁₁d₁₂…,d_1M，…，d_L1d_L2…,d_LM。

Correspondingly, the receiving end firstly carries out frequency domain equalization to eliminate the influence of a channel;

for completing frequency domain equalizationThe phase of the processed time domain signal, the phase rotation signal corresponding to the l target sub-block is obtained as follows, wherein ∠ {. cndot. } represents the phase calculation,

representing the phase corresponding to the l target sub-block estimated by the receiving end, representing the phase rotation signal of the l initial sub-block determined by the transmitting end, representing the time domain signal corresponding to the m pilot symbol in the l sub-block after the frequency domain equalization processing is finished, and d_lmDenotes the mth pilot symbol, n, in the l sub-block_lmRepresenting the noise corresponding to the mth pilot symbol in the lth sub-block.

The data in each target sub-block is multiplied by the conjugate signal of the corresponding phase rotation signal to eliminate the influence of the phase rotation signal.

Alternatively, as another embodiment, the target sub-block of each initial sub-block has pilot symbols at the reserved symbol positions, and the pilot symbols are used by the receiving end to determine the phase rotation signal of each initial sub-block.

For example, as shown in FIG. 7, the transmitting end divides the data group in a BLK into L initial sub-blocks, each of which is multiplied by a specific phase rotation signal

for the time domain signal after the frequency domain equalization processing is completed, the phase of the phase rotation signal corresponding to the ith target sub-block is obtained as follows:

wherein ∠ {. denotes taking the phase,

l＝1,2,…,L。m＝1，2，…M，

indicating the phase corresponding to the l target sub-block estimated by the receiving end,

a phase rotation signal indicating the l-th initial sub-block determined by the transmitting end,

represents the time domain signal corresponding to the mth pilot symbol in the first sub-block after the frequency domain equalization processing is finished, d_lmDenotes the mth pilot symbol, n, in the l sub-block_lmRepresenting the noise corresponding to the mth pilot symbol in the lth sub-block.

Alternatively, as another embodiment, a first pilot symbol is transmitted at a reserved symbol position of a first target sub-block in all target sub-blocks, the first pilot symbol is used for estimating a phase rotation signal of the first initial sub-block, and a known transformation form of the first pilot symbol is transmitted at a reserved symbol position of other target sub-blocks except the first target sub-block in all target sub-blocks, and the known transformation form is used for a receiving end to estimate phase rotation signals of other initial sub-blocks according to the transformation form.

Processing of the transmitter:

for example, as shown in fig. 8, the transmitting end divides the data group in one BLK into L initial sub-blocks, each of which is multiplied by a specific phase rotation signal

To obtainA target sub-block, wherein the phase rotation signal of the first initial sub-block may be 1 or other known value;

m pilot symbols are reserved in each target sub-block for the receiver to estimate the corresponding rotation signal of each block, and the pilot symbols are obtained by performing known transformation on M symbols (e.g., the first pilot symbol) unknown to the receiver, for example, the pilot symbols of the first target sub-block to the lth target sub-block may be d respectively₁,d₂,…,d_M，

Specifically, the method comprises the following steps:

f₁(d₁,d₂,…,d_M)＝d₁,d₂,…,d_M,

…

in one of the cases, the first case is,

f₁(d₁,d₂,…,d_M)＝d₁,d₂,…,d_M，f_l(d₁,d₂,…,d_M)＝p_l1d₁,p_l2d₂,…,p_lMd_M，l＝2,…,L，[p_l1,p_l2,…,p_lM]symbols known to both the transmitter and the receiver.

In another case, f_l(d₁,d₂,…,d_M)＝d₁,d₂,…,d_ML2, …, L, i.e. the same symbol is sent on all target sub-blocks.

Correspondingly, the receiving end performs the following processing:

firstly, frequency domain equalization is carried out to eliminate the influence of a channel;

to completionThe phase of the time domain signal after the frequency domain equalization processing and the phase rotation signal corresponding to the ith target block are obtained in the following way, wherein ∠ {. cndot.) represents the phase calculation,

n is noise.

Is f_l(…) inverse transformation. M is 1, 2, … M, which represents the phase corresponding to the l target sub-block estimated by the receiving end, the phase rotation signal of the l initial sub-block determined by the transmitting end, the time domain signal corresponding to the M pilot symbol in the l sub-block after completing the frequency domain equalization processing, and d_1mDenotes the mth pilot symbol in the 1 st sub-block, denotes the mth pilot symbol in the l sub-block, n_lmRepresenting the noise corresponding to the mth pilot symbol in the lth sub-block.

In the case of the first case, it is,

f_l(d₁,d₂,…,d_M)＝p_l1d₁,p_l2d₂,…,p_lMd_M

in the case of the second case, it is,

f_l(d₁,d₂,…,d_M)＝d₁,d₂,…,d_M，

Alternatively, as another embodiment, indication information of the phase rotation signals of all the initial sub-blocks is transmitted in the transmission data in one of all the target sub-blocks, and the indication information is used by the receiving end to determine the phase rotation signals of all the initial sub-blocks.

For example, as shown in fig. 9, the transmitting end divides the data group in one BLK into L initial sub-blocks, each of which is multiplied by a specific phase rotation signal

in the embodiment of the present invention, the indication information of the phase rotation signals of all initial sub-blocks may be transmitted in the transmission data in any one of all target sub-blocks, for example, the indication information of the phase rotation signals corresponding to all initial sub-blocks may be transmitted in the data transmitted in the first target sub-block.

Correspondingly, the receiving end performs the following processing:

and when the phase rotation signal indication information corresponding to all the initial sub-blocks is transmitted in the data transmitted by the first target sub-block, demodulating the first target sub-block to acquire the phase rotation signals corresponding to all the target sub-blocks.

It should be understood that, in the embodiment of the present invention, only the target sub-block configured with the fixed phase rotation signal (indication information) is used as the first target block, and actually, any one of the target sub-blocks configured with the fixed phase rotation signal may be used, which is not limited in the embodiment of the present invention.

Alternatively, as another embodiment, in 220, the plurality of sets of phase rotated signals includes: and the candidate phase rotation signal group is a real phase rotation signal group when the data in the target BLK is a real signal, and the candidate phase rotation signal group is an imaginary phase rotation signal group when the data in the target BLK is an imaginary signal.

In the embodiment of the invention, the data in the BLK has specific requirements on the modulation mode, and is only suitable for BPSK modulation or BPSK-like modulation, such as pi/2 BPSK modulation in 802.11 ad.

BPSK modulation is implemented by assuming that the input bit signal c (N) (0 or 1), the modulated signal s (N) (2 c (N) -1, s (N)) has a value of 1 or-1, where N is the sequence number of the data symbol in BLK, and has a value of 0, …, Nt-1, where N is N_tIndicates the number of symbols of the data set, for example 448; the pi/2 BPSK modulation is implemented as follows:

for example, as shown in fig. 10, at the transmitting end, the data group in a BLK is divided into L initial sub-blocks, and the combination of L phase rotation signals can be selected from only two combinations: phi₁And phi₂Wherein phi₁The phase rotation signal in (1) or (1) (phase is 0 or pi), phi₂The phase rotation signal in (1) is j or-j (the phase is

Or

). Or phi₁The phase rotation signal in (1) is a real number, [ phi ]₂The phase rotation signal in (1) is an imaginary number.

Taking the division into two sub-blocks as an example, phi₁＝[1 1]And phi₂＝[j -j]That is, the phase rotation signal can be selected only as one of two results:

correspondingly, the receiving end performs the following processing:

firstly, frequency domain equalization is carried out to eliminate the influence of a channel and obtain a time domain signalData of

For BPSK modulation, if

The phase rotation signal employed by the transmitter is phi₁Otherwise, it is phi₂. Wherein real {. is } represents the real part of the evaluated signal, and imag {. is } represents the imaginary part of the evaluated signal. Put another way, if the energy of the I path is greater than the energy of the Q path, the phase rotation signal used by the transmitter is Φ₁Otherwise, it is phi₂. (the I path corresponds to the real part of the transmitted signal and the Q path corresponds to the imaginary part of the transmitted signal)

For pi/2 BPSK modulation, if

The phase rotation signal employed by the transmitter is phi₁Otherwise, it is phi₂。

Alternatively, as another embodiment, in 220, the phase rotation signals of all initial sub-blocks are determined to be a preset fixed value.

In particular, the embodiment of the present invention is applicable to the case where the content of the data frame is a fixed value or changes only within a limited range. In this case, a set of phase-rotated signal combinations with optimal performance can be found for the frames with constant data or the frames with data values varying in a limited range, and used for transmission and reception.

For example, as shown in FIG. 11, the transmitting end divides the data group in a BLK into L initial sub-blocks, each of which is multiplied by a fixed phase rotation signal

And obtaining the target sub-block.

Correspondingly, the receiving end performs the following processing:

since the receiver knows the phase rotation signal, no detection is required, and the data in each target sub-block is multiplied by the conjugate signal of the corresponding phase rotation signal to eliminate the influence of the phase rotation signal.

Alternatively, as another embodiment, in 220, the phase rotation signals of all the initial sub-blocks are obtained by sequentially selecting from a preset set according to a preset rule.

Further, as another embodiment, when L is 2, the preset set includes { [ 11 ], [ 1-1 ], [1 j ], [1-j ] }.

In other words, the embodiment of the present invention performs data transmission and reception by using a diversity method.

For example, as shown in fig. 12, at the transmitting end, the data groups in one BLK are divided into L initial sub-blocks, M BLKs are grouped, and the phase rotation signal of each BLK in each group is sequentially selected from a group of fixed sets in time order. The same processing method is used for the phase rotation signals between different BLK sets.

The above processing is expressed in mathematical form, where Φ is { Φ ═ Φ₁,Φ₂,…,Φ_M}，

The phase rotation signal corresponding to the first initial sub-block in the mth BLK in each group is

Examples are as follows: for example, as shown in fig. 12(a), when L is 2, i.e. 2 BLKs are grouped into one group, the data in each BLK is divided into 2 initial sub-blocks, and the phase rotation signal of each initial sub-block in each BLK is sequentially selected from the set { [ 11 ], [1 j ], [1-j ], [ 1-1 ] };

for another example, as shown in fig. 12(B), when L is 2, 2 BLKs are divided into one group, the data group in each BLK is divided into 2 initial sub-blocks, and the phase rotation signal of each initial sub-block is sequentially selected from the set { [ 11 ], [ 1-1 ] };

correspondingly, the receiving end performs the following processing:

since the receiver knows the set of phase rotation signals of the transmitted signals and the selection method, detection is not needed, and the data in each target sub-block in each target BLK is multiplied by the conjugate signal of the corresponding phase rotation signal, so as to eliminate the influence of the phase rotation signal.

The method of transmitting data of the embodiment of the present invention is described in detail above from the transmitting end side with reference to fig. 1 to 12, and the method of transmitting data of the embodiment of the present invention is described in detail below from the receiving end side with reference to fig. 13.

It should be understood that the specific processing procedure of the receiving end side corresponds to that of the transmitting end side, and some processing procedures of the receiving end side can be regarded as inverse operation of the transmitting end side, and a detailed description is appropriately omitted here to avoid redundancy.

Fig. 13 is a schematic flow chart of a method of transmitting data for a wireless local area network according to another embodiment of the present invention. The method shown in fig. 13 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. 13 includes:

1310, receiving a target PPDU, wherein a data group in a target data block BLK of the target PPDU includes L target sub-blocks, and L is greater than or equal to 2;

1320, determining a phase rotation signal of an initial sub-block corresponding to each of the L target sub-blocks, wherein each target sub-block is a product of the phase rotation signals of the initial sub-block and the initial sub-block;

1330, multiplying the data symbol in each target sub-block in the target BLK of the target PPDU after completing the frequency domain equalization with the conjugate signal of the corresponding initial sub-block phase rotation signal to obtain the time domain signal of the target BLK.

Therefore, in the embodiment of the present invention, each target sub-block is a product of the phase rotation signal of the initial sub-block and the phase rotation signal of the initial sub-block, so that the peak-to-average ratio of the data after frequency domain transformation is small, and since the data symbol in each target sub-block in the target BLK of the target PPDU after frequency domain equalization is multiplied by the conjugate signal of the phase rotation signal of the corresponding initial sub-block, the influence of the phase rotation signal is eliminated, and further, the time domain signal of the target BLK is obtained. Therefore, the peak-to-average ratio of the data block transformed to the frequency domain data can be reduced in the embodiment of the invention, so that the receiving end can reliably recover the frequency domain signal, and the accuracy of data transmission and the performance of a system can be improved.

For example, as shown in fig. 4, both the Header and Data portions in a PPDU in the 802.11ad standard are composed of several BLKs (BLOCKs). Each BLOCK is composed of a DATA group (DATA) of 448 symbols and a GI of 64 symbols.

Optionally, as another embodiment, in 1320, phase rotation signals of all initial sub-blocks are estimated according to pilot signals of all target sub-blocks, wherein the phase rotation signal of the first initial sub-block is estimated according to pilot symbols of the first target sub-block; and estimating the difference value of the phase rotation signal of the corresponding initial sub-block and the phase rotation signal of the previous initial sub-block according to the pilot symbols of other target sub-blocks, and determining the phase rotation signals of other initial sub-blocks according to the difference value and the phase rotation signal of the first initial sub-block.

For example, as shown in FIG. 6, the transmitting end divides the data set in a BLK into L initial sub-blocks, each initial sub-block is multiplied by a specific phase rotation signalNumber (C)

for the time domain signal after the frequency domain equalization processing is completed, the phase of the phase rotation signal corresponding to the l target sub-block is obtained in the following way, wherein ∠ {. is expressed as solving the phase,

Alternatively, as another embodiment, in 1320, the phase rotation signal of the initial sub-block corresponding to each target sub-block is estimated according to the pilot symbols of each target sub-block.

Obtaining a target sub-block, whichThe phase rotation signal of the first initial sub-block may be 1 or other known value;

wherein ∠ {. denotes taking the phase,

l＝1,2,…,L。m＝1，2，…M，

Alternatively, as another embodiment, in 1320, phase rotation signals of all initial sub-blocks are estimated according to pilot signals of all target sub-blocks, wherein the phase rotation signal of the first initial sub-block of all initial sub-blocks is estimated according to the first pilot symbol of the first target sub-block of all target sub-blocks; and estimating a transformation form of the phase rotation signal of the corresponding initial sub-block relative to the phase rotation signal of the first initial sub-block according to the pilot symbols of other target sub-blocks, and determining the phase rotation signals of other initial sub-blocks according to the transformation form and the phase rotation signal of the first initial sub-block.

For example, as shown in FIG. 8, the transmitting end divides the data group in a BLK into L initial sub-blocks, each of which is multiplied by a specific phase rotation signal

m pilot symbols are reserved in each target sub-block for the receiver to estimate the corresponding rotation signal of each block, and the pilot symbols are obtained by performing known transformation on M symbols (e.g., a first pilot symbol) unknown to the receiver, for example, the pilot symbols of the first target sub-block to the lth target sub-block may be respectively M pilot symbols

f₁(d₁,d₂,…,d_M)＝d₁,d₂,…,d_M,

…

In one of the cases, the first case is,

Correspondingly, the receiving end performs the following processing:

for the time domain signal after the frequency domain equalization processing is finished, the phase of the phase rotation signal corresponding to the l < th > target block is obtained in the following way, wherein ∠ {. is expressed as solving the phase,

is noise.

In the case of the first case, it is,

f_l(d₁,d₂,…,d_M)＝p_l1d₁,p_l2d₂,…,p_lMd_M

in the case of the second case, it is,

f_l(d₁,d₂,…,d_M)＝d₁,d₂,…,d_M，

Alternatively, as another embodiment, in 1320, the phase rotation signals of all initial sub-blocks are determined according to the indication information of the phase rotation signals of all initial sub-blocks transmitted in one of all target sub-blocks.

Correspondingly, the receiving end performs the following processing:

Alternatively, as another embodiment, in 1320, a phase rotation signal of the initial sub-block is determined according to a type of data in the BLK in the target PPDU, wherein the phase rotation signal of the initial sub-block is determined to be one of the real phase selection signal groups when the data in the BLK in the target PPDU is a real signal, and the phase rotation signal of the initial sub-block is determined to be one of the imaginary phase selection signal groups when the data in the BLK in the target PPDU is an imaginary signal.

Or

correspondingly, the receiving end performs the following processing:

firstly, frequency domain equalization is carried out to eliminate the influence of a channel and obtain time domain signal data

For BPSK modulation, if

For pi/2 BPSK modulation, if

Alternatively, as another embodiment, in 1320, a preset fixed value is determined as the phase rotation signal of the initial sub-block.

And obtaining the target sub-block.

Correspondingly, the receiving end performs the following processing:

Alternatively, as another embodiment, in 1320, the phase rotation signals of all the initial sub-blocks are sequentially selected from the preset set according to a preset rule.

Further, when L is 2, the preset set includes { [ 11 ], [ 1-1 ], [1 j ], [1-j ] }.

Examples are as follows: for example, when L is 2, i.e. 2 BLKs are divided into a group, the data in each BLK is divided into 2 initial sub-blocks, and the phase rotation signal of each initial sub-block in each BLK is sequentially selected from the set { [ 11 ], [1 j ], [1-j ], [ 1-1 ] };

for another example, when L is 2, 2 BLKs are divided into one group, the data group in each BLK is 2 initial sub-blocks, and the phase rotation signal of each initial sub-block is sequentially selected from the sets { [ 11 ], [ 1-1 ] };

correspondingly, the receiving end performs the following processing:

The method for transmitting data according to the embodiment of the present invention is described above in detail with reference to fig. 1 to 13, and the apparatus for transmitting data according to the embodiment of the present invention is described below in detail with reference to fig. 14 to 17.

Fig. 14 is a schematic block diagram of an apparatus for data transmission of a wireless local area network according to one embodiment of the present invention. The device 1400 shown in fig. 14 may also be referred to as 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, the receiving end device is a station; when the sending end device is a station, the receiving end device is an access point. It should be understood that the apparatus 1400 shown in fig. 14 corresponds to the method shown in fig. 2, and can implement the processes in the method embodiment of fig. 2, and the specific functions of the apparatus 1400 can be referred to the corresponding descriptions in fig. 2, and the detailed descriptions are appropriately omitted here to avoid repetition.

Specifically, the apparatus 1400 comprises: a dividing unit 1410, a determining unit 1420, an obtaining unit 1430, a combining unit 1440, and a transmitting unit 1450.

The dividing unit 1410 is configured to divide a data group in a data block BLK of an initial physical layer protocol data unit PPDU to be transmitted by using a single carrier into L initial sub-blocks, where L is greater than or equal to 2, where the BLK includes the data group and a guard interval GI; the determining unit 1420 is configured to determine a phase rotation signal for each of the L initial sub-blocks; the obtaining unit 1430 is configured to multiply the data symbol of each initial sub-block with the phase rotation signal of each initial sub-block to obtain a target sub-block of each initial sub-block; the combining unit 1440 is configured to combine the target sub-block of the L initial sub-blocks with the GI to obtain a target BLK, where a peak-to-average ratio of the frequency domain data after the target BLK is transformed to the frequency domain is smaller than a peak-to-average ratio of the frequency domain data after the BLK is transformed to the frequency domain; the sending unit 1450 is configured to generate a target PPDU according to the target BLK and send the target PPDU to the receiving end device.

Alternatively, as another embodiment, the dividing unit 1410 sequentially divides the data group to obtain L initial sub-blocks;

or interleaving and dividing the data group to obtain L initial sub-blocks;

Alternatively, as another embodiment, the determining unit 1420 determines a candidate phase rotation signal group from among the plurality of phase rotation signals, and selects the phase rotation signal of each of the L initial sub-blocks from among the candidate phase rotation signal group such that peak-to-average ratios of the frequency domain data transformed into the frequency domain by the data obtained by multiplying the L initial sub-blocks by the corresponding phase rotation signals, respectively, are minimized.

Optionally, as another embodiment, the plurality of sets of phase rotation signals includes: e.g. of the type^j*(0*π),e^j*(0.5*π),e^j*(1*π),e^j ^*(1.5*π)And e^j*(0.25*π),e^j*(0.75*π),e^j*(1.25*π),e^j*(1.75*π)。

Alternatively, as another embodiment, the data in the target BLK is a real or imaginary signal,

a plurality of sets of phase rotated signals, comprising: and the candidate phase rotation signal group is a real phase rotation signal group when the data in the target BLK is a real signal, and the candidate phase rotation signal group is an imaginary phase rotation signal group when the data in the target BLK is an imaginary signal.

Alternatively, as another embodiment, the determination unit 1420 determines the phase rotation signals of all the initial sub-blocks to be a preset fixed value.

Alternatively, as another embodiment, the determining unit 1420 determines the phase rotation signals of all the initial sub-blocks to be sequentially selected from a preset set according to a preset rule.

Fig. 15 is a schematic block diagram of an apparatus for data transmission of a wireless local area network according to one embodiment of the present invention. The device 1500 shown in fig. 15 may also be referred to as 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. It should be understood that the apparatus 1500 shown in fig. 15 corresponds to the method shown in fig. 13, and can implement the processes in the method embodiment of fig. 13, and the specific functions of the apparatus 1500 can be referred to the corresponding descriptions in fig. 13, and the detailed descriptions are appropriately omitted here to avoid repetition.

Specifically, the apparatus 1500 includes: a receiving unit 1510, a determining unit 1520, and an obtaining unit 1530.

The receiving unit 1510 is configured to receive a target PPDU, where a data group in a target data block BLK of the target PPDU includes L target sub-blocks, and L is greater than or equal to 2; the determining unit 1520 is configured to determine a phase rotation signal of an initial sub-block corresponding to each of the L target sub-blocks, where each target sub-block is a product of the phase rotation signals of the initial sub-block and the initial sub-block; the obtaining unit 1530 is configured to multiply the data symbol in each target sub-block in the target BLK of the target PPDU after the frequency domain equalization is completed by the conjugate signal of the corresponding initial sub-block phase rotation signal, so as to obtain a time domain signal of the target BLK.

Alternatively, as another embodiment, the determining unit 1520 estimates phase rotation signals of all initial sub-blocks according to pilot signals of all target sub-blocks, wherein the phase rotation signal of the first initial sub-block is estimated according to pilot symbols of the first target sub-block; and estimating the difference value of the phase rotation signal of the corresponding initial sub-block and the phase rotation signal of the previous initial sub-block according to the pilot symbols of other target sub-blocks, and determining the phase rotation signals of other initial sub-blocks according to the difference value and the phase rotation signal of the first initial sub-block.

Alternatively, as another embodiment, the determining unit 1520 estimates the phase rotation signal of the initial sub-block corresponding to each target sub-block according to the pilot symbols of each target sub-block.

Alternatively, as another embodiment, the determining unit 1520 estimates the phase rotation signals of all initial sub-blocks according to the pilot signals of all target sub-blocks, wherein the phase rotation signal of the first initial sub-block of all initial sub-blocks is estimated according to the first pilot symbol of the first target sub-block of all target sub-blocks; and estimating a transformation form of the phase rotation signal of the corresponding initial sub-block relative to the phase rotation signal of the first initial sub-block according to the pilot symbols of other target sub-blocks, and determining the phase rotation signals of other initial sub-blocks according to the transformation form and the phase rotation signal of the first initial sub-block.

Alternatively, as another embodiment, the determining unit 1520 determines the phase rotation signals of all initial sub-blocks transmitted in one of all target sub-blocks according to indication information of the phase rotation signals of all initial sub-blocks.

Alternatively, as another embodiment, the determining unit 1520 determines the phase rotation signal of the initial sub-block according to a type of data in the BLK in the target PPDU, wherein the phase rotation signal of the initial sub-block is determined to be one of the real phase selection signal groups when the data in the BLK in the target PPDU is a real signal, and the phase rotation signal of the initial sub-block is determined to be one of the imaginary phase selection signal groups when the data in the BLK in the target PPDU is an imaginary signal.

Alternatively, as another embodiment, the determination unit 1520 determines a preset fixed value as the phase rotation signal of the initial sub-block.

Alternatively, as another embodiment, the determining unit 1520 sequentially selects the phase rotation signals of all the initial sub-blocks from the preset set according to a preset rule.

Alternatively, as another embodiment, when L is 2, the preset set includes { [ 11 ], [ 1-1 ], [1 j ], [1-j ] }.

Fig. 16 is a schematic block diagram of an apparatus for data transmission of a wireless local area network according to another embodiment of the present invention. The device 1600 shown in fig. 16 may also be referred to as 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, the receiving end device is a station; when the sending end device is a station, the receiving end device is an access point. It should be understood that the apparatus 1600 shown in fig. 16 corresponds to the method shown in fig. 1, and can implement various processes in the method embodiment of fig. 1, and the specific functions of the apparatus 1600 can be referred to the corresponding description in fig. 1, and the detailed description is appropriately omitted here to avoid repetition.

The device 1600 as shown in fig. 16 includes a processor 1610, a memory 1620, a bus system 1630, and a transceiver 1640.

Specifically, processor 1610 invokes, through bus system 1630, a code stored in memory 1620, to divide a data group in a data block BLK of an initial physical layer protocol data unit PPDU to be transmitted using a single carrier into L initial sub-blocks, where L is greater than or equal to 2, where BLK includes the data group and a guard interval GI; determining a phase rotation signal for each of the L initial sub-blocks; multiplying the data symbol of each initial sub-block by the phase rotation signal of each initial sub-block to obtain a target sub-block of each initial sub-block; combining the target sub-blocks of the L initial sub-blocks and the GI to obtain a target BLK, wherein the peak-to-average ratio of the frequency domain data after the target BLK is transformed to the frequency domain is smaller than the peak-to-average ratio of the frequency domain data after the BLK is transformed to the frequency domain; the transceiver 1640 is configured to generate a target PPDU from the target BLK and transmit the target PPDU to the receiving end device.

The method disclosed in the embodiments of the present invention may be implemented in the processor 1610 or implemented by the processor 1610. Processor 1610 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 1610. The Processor 1610 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 a memory 1620, the processor 1610 reads the information in the memory 1620, and the steps of the above method are performed by combining hardware thereof, and the bus system 1630 may include a power bus, a control bus, a status signal bus, and the like, in addition to a data bus. But for purposes of clarity, the various buses are identified in the figure as bus system 1630.

Alternatively, as another embodiment, processor 1610 may sequentially divide the data group to obtain L initial sub-blocks;

or interleaving and dividing the data group to obtain L initial sub-blocks;

Alternatively, as another embodiment, the processor 1610 determines a candidate phase rotation signal group from a plurality of phase rotation signals, and selects a phase rotation signal of each of L initial sub-blocks from the candidate phase rotation signal group, so that a peak-to-average ratio of data obtained by multiplying the L initial sub-blocks by the corresponding phase rotation signals respectively and transforming the data into frequency domain data is minimized.

Alternatively, as another embodiment, the processor 1610 determines the phase rotation signals of all the initial sub-blocks to be a preset fixed value.

Alternatively, as another embodiment, the processor 1610 determines the phase rotation signals of all the initial sub-blocks to be sequentially selected from a preset set according to a preset rule.

Fig. 17 is a schematic block diagram of an apparatus for data transmission of a wireless local area network according to one embodiment of the present invention. The device 1700 shown in fig. 17 may also be referred to as 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. It should be understood that the apparatus 1700 shown in fig. 17 corresponds to the method shown in fig. 13, and can implement the processes in the method embodiment of fig. 13, and the specific functions of the apparatus 1700 can be referred to the corresponding descriptions in fig. 13, and the detailed descriptions are appropriately omitted here to avoid repetition.

The device 1700 as shown in fig. 17 includes a processor 1710, a memory 1720, a bus system 1730, and a transceiver 1740.

Specifically, the transceiver 1740 receives a target PPDU, a data group in a target data block BLK of the target PPDU including L target sub-blocks, L being greater than or equal to 2; the processor 1710 invokes code stored in the memory 1720 via the bus system 1730 to determine a phase rotation signal for an initial subblock corresponding to each of the L target subblocks, wherein each target subblock is a product of the phase rotation signals for the initial subblock and the initial subblock; and multiplying the data symbol in each target sub-block in the target BLK of the target PPDU subjected to frequency domain equalization by the conjugate signal of the corresponding initial sub-block phase rotation signal to obtain a time domain signal of the target BLK.

The method disclosed by the embodiment of the invention can be applied to the processor 1710 or implemented by the processor 1710. The processor 1710 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 1710. The Processor 1710 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, 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 1720, the processor 1710 reads the information in the memory 1720, and the bus system 1730 can include a power bus, a control bus, a status signal bus, etc. in addition to the data bus, and combines the hardware to perform the above-described method steps. But for purposes of clarity, the various buses are identified in the figure as bus system 1730.

Optionally, as another embodiment, the processor 1710 estimates phase rotation signals of all initial sub-blocks according to pilot signals of all target sub-blocks, wherein the phase rotation signal of the first initial sub-block is estimated according to pilot symbols of the first target sub-block; and estimating the difference value of the phase rotation signal of the corresponding initial sub-block and the phase rotation signal of the previous initial sub-block according to the pilot symbols of other target sub-blocks, and determining the phase rotation signals of other initial sub-blocks according to the difference value and the phase rotation signal of the first initial sub-block.

Alternatively, as another embodiment, the processor 1710 estimates the phase rotation signal of the initial sub-block corresponding to each target sub-block according to the pilot symbols of each target sub-block.

Alternatively, as another embodiment, the processor 1710 estimates the phase rotation signals of all the initial sub-blocks according to the pilot signals of all the target sub-blocks, wherein the phase rotation signal of the first initial sub-block of all the initial sub-blocks is estimated according to the first pilot symbol of the first target sub-block of all the target sub-blocks; and estimating a transformation form of the phase rotation signal of the corresponding initial sub-block relative to the phase rotation signal of the first initial sub-block according to the pilot symbols of other target sub-blocks, and determining the phase rotation signals of other initial sub-blocks according to the transformation form and the phase rotation signal of the first initial sub-block.

Alternatively, as another embodiment, the processor 1710 determines the phase rotation signals of all initial sub-blocks transmitted in one of all target sub-blocks according to the indication information of the phase rotation signals of all initial sub-blocks.

Alternatively, as another embodiment, the processor 1710 determines the phase rotation signal of the initial sub-block as one of the real phase selection signal groups according to a type of data in the BLK in the target PPDU, wherein the phase rotation signal of the initial sub-block is determined as one of the real phase selection signal groups when the data in the BLK in the target PPDU is a real signal, and the phase rotation signal of the initial sub-block is determined as one of the imaginary phase selection signal groups when the data in the BLK in the target PPDU is an imaginary signal.

Alternatively, as another embodiment, the processor 1710 determines a preset fixed value as the phase rotation signal of the initial sub-block.

Alternatively, as another embodiment, the processor 1710 sequentially selects the phase rotation signals of all the initial sub-blocks from the preset set according to a preset rule.

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 various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate 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 for a wireless local area network, comprising:

dividing a data group in a data block BLK of an initial physical layer protocol data unit PPDU to be transmitted by adopting a single carrier into L initial sub-blocks, wherein L is greater than or equal to 2, and the BLK comprises the data group and a guard interval GI;

determining a phase rotation signal for each of the L initial sub-blocks;

multiplying the data symbol of each initial sub-block with the phase rotation signal of each initial sub-block to obtain a target sub-block of each initial sub-block, wherein a pilot symbol is arranged at a reserved symbol position of the target sub-block of each initial sub-block, the pilot symbol on the reserved symbol of the first target sub-block is used for estimating the phase rotation signal of the first initial sub-block, and the pilot symbols of other target sub-blocks are used for estimating the phase difference value between the phase rotation signal of the corresponding initial sub-block and the phase rotation signal of the previous initial sub-block, so that a receiving end can estimate the phase rotation signal of each initial sub-block according to the pilot signal of the initial sub-block;

combining the target sub-blocks of the L initial sub-blocks and the GI to obtain a target BLK, wherein the peak-to-average ratio of the frequency domain data transformed to the frequency domain by the target BLK is smaller than the peak-to-average ratio of the frequency domain data transformed to the frequency domain by the BLK;

2. The method according to claim 1, wherein the dividing the data group in the data block BLK of the initial physical layer protocol data unit PPDU to be transmitted using a single carrier into L initial sub-blocks comprises:

sequentially dividing the data group to obtain the L initial sub-blocks;

alternatively, the first and second electrodes may be,

interleaving and dividing the data group to obtain the L initial sub-blocks;

alternatively, the first and second electrodes may be,

3. The method of claim 1 or 2, wherein the determining the phase rotation signal for each of the L initial sub-blocks comprises:

and determining a candidate phase rotation signal group from a plurality of groups of phase rotation signals, and selecting the phase rotation signal of each initial sub-block in the L initial sub-blocks from the candidate phase rotation signal group, so that the peak-to-average ratio of frequency domain data transformed into a frequency domain by data obtained by multiplying the L initial sub-blocks by the corresponding phase rotation signals is minimum.

4. The method of claim 3, wherein the plurality of sets of phase-rotated signals comprises: e.g. of the type^j*(0*π),e^j ^*(0.5*π),e^j*(1*π),e^j*(1.5*π)And e^j*(0.25*π),e^j*(0.75*π),e^j*(1.25*π),e^j*(1.75*π)。

5. A method for transmitting data for a wireless local area network, comprising:

determining a phase rotation signal for each of the L initial sub-blocks;

multiplying the data symbol of each initial sub-block with the phase rotation signal of each initial sub-block to obtain a target sub-block of each initial sub-block, transmitting a first pilot symbol at a reserved symbol position of a first target sub-block in all target sub-blocks, wherein the first pilot symbol is used for estimating the phase rotation signal of the first initial sub-block, transmitting a known transformation form of the first pilot symbol at the reserved symbol position of other target sub-blocks except the first target sub-block in all target sub-blocks, and the known transformation form is used for a receiving end to estimate the phase rotation signals of other initial sub-blocks according to the transformation form;

6. The method according to claim 5, wherein the dividing the data groups in the data block BLK of the initial physical layer protocol data unit PPDU to be transmitted using single carrier into L initial sub-blocks comprises:

sequentially dividing the data group to obtain the L initial sub-blocks;

alternatively, the first and second electrodes may be,

interleaving and dividing the data group to obtain the L initial sub-blocks;

alternatively, the first and second electrodes may be,

7. The method of claim 5 or 6, wherein the determining the phase rotation signal for each of the L initial sub-blocks comprises:

8. The method of claim 7, wherein the plurality of sets of phase-rotated signals comprises: e.g. of the type^j*(0*π),e^j ^*(0.5*π),e^j*(1*π),e^j*(1.5*π)And e^j*(0.25*π),e^j*(0.75*π),e^j*(1.25*π),e^j*(1.75*π)。

9. A method for transmitting data for a wireless local area network, comprising:

determining a set of candidate phase rotation signals from a plurality of sets of phase rotation signals, the phase rotation signal for each of the L initial sub-blocks being selected from the set of candidate phase rotation signals;

multiplying the data symbol of each initial sub-block with the phase rotation signal of each initial sub-block to obtain a target sub-block of each initial sub-block;

combining the target sub-blocks of the L initial sub-blocks and the GI to obtain a target BLK, wherein the peak-to-average ratio of frequency domain data after the target BLK is transformed to a frequency domain is smaller than the peak-to-average ratio of frequency domain data after the BLK is transformed to the frequency domain, the peak-to-average ratio of the frequency domain data after the L initial sub-blocks are respectively multiplied by corresponding phase rotation signals and transformed to the frequency domain is the minimum, the data in the target BLK is an imaginary number signal, the plurality of groups of phase rotation signals comprise an imaginary number phase rotation signal group, and when the data in the target BLK is the imaginary number signal, the candidate phase rotation signal group is the imaginary number phase rotation signal group;

10. The method according to claim 9, wherein the dividing the data groups in the data block BLK of the initial physical layer protocol data unit PPDU to be transmitted using a single carrier into L initial sub-blocks comprises:

sequentially dividing the data group to obtain the L initial sub-blocks;

alternatively, the first and second electrodes may be,

interleaving and dividing the data group to obtain the L initial sub-blocks;

alternatively, the first and second electrodes may be,

11. The method of claim 9 or 10, wherein the plurality of sets of phase rotated signals comprises: e.g. of the type^j ^*(0*π),e^j*(0.5*π),e^j*(1*π),e^j*(1.5*π)And e^j*(0.25*π),e^j*(0.75*π),e^j*(1.25*π),e^j*(1.75*π)。

12. A method for transmitting data for a wireless local area network, comprising:

estimating phase rotation signals of all initial sub-blocks according to pilot signals of all target sub-blocks, wherein the phase rotation signal of a first initial sub-block is estimated according to pilot symbols of the first target sub-block; estimating a difference value between a phase rotation signal of the corresponding initial sub-block and a phase rotation signal of a previous initial sub-block according to pilot symbols of other target sub-blocks, and determining the phase rotation signals of the other initial sub-blocks according to the difference value and the phase rotation signal of the first initial sub-block, wherein each target sub-block is a product of the phase rotation signals of the initial sub-blocks and the initial sub-blocks;

and multiplying the data symbol in each target sub-block in the target BLK of the target PPDU subjected to frequency domain equalization by the conjugate signal of the corresponding initial sub-block phase rotation signal to obtain the time domain signal of the target BLK.

13. A method for transmitting data for a wireless local area network, comprising:

estimating phase rotation signals of all initial sub-blocks according to pilot signals of all target sub-blocks, wherein the phase rotation signals of a first initial sub-block in all initial sub-blocks are estimated according to a first pilot symbol of the first target sub-block in all target sub-blocks; estimating a transformation form of a phase rotation signal of a corresponding initial sub-block relative to a phase rotation signal of a first initial sub-block according to pilot symbols of other target sub-blocks, and determining phase rotation signals of other initial sub-blocks according to the transformation form and the phase rotation signal of the first initial sub-block, wherein each target sub-block is a product of the phase rotation signals of the initial sub-block and the initial sub-block;

14. A method for transmitting data for a wireless local area network, comprising:

determining a phase rotation signal of an initial sub-block corresponding to each target sub-block in the L target sub-blocks according to the type of data in the BLK in the target PPDU, wherein each target sub-block is a product of the initial sub-block and the phase rotation signal of the initial sub-block, and when the data in the BLK in the target PPDU is an imaginary signal, determining the phase rotation signal of the initial sub-block to be one of the imaginary phase selection signal groups;

15. An apparatus for transmitting data for a wireless local area network, comprising:

the system comprises a dividing unit, a transmitting unit and a receiving unit, wherein the dividing unit is used for dividing a data group in a data block BLK of an initial physical layer protocol data unit PPDU to be transmitted by adopting a single carrier into L initial sub-blocks, L is more than or equal to 2, and the BLK comprises the data group and a guard interval GI;

a determining unit, configured to determine a phase rotation signal of each of the L initial sub-blocks;

an obtaining unit, configured to multiply the data symbol of each initial sub-block with the phase rotation signal of each initial sub-block to obtain a target sub-block of each initial sub-block, where a reserved symbol position of the target sub-block of each initial sub-block has a pilot symbol, where the pilot symbol on the reserved symbol of the first target sub-block is used to estimate the phase rotation signal of the first initial sub-block, and the pilot symbols of other target sub-blocks are used to estimate a phase difference between the phase rotation signal of the corresponding initial sub-block and the phase rotation signal of the previous initial sub-block, so that a receiving end estimates the phase rotation signal of each initial sub-block according to the pilot signal of the initial sub-block;

a combining unit, configured to combine a target sub-block of the L initial sub-blocks with the GI to obtain a target BLK, where a peak-to-average ratio of frequency domain data after the target BLK is transformed to a frequency domain is smaller than a peak-to-average ratio of frequency domain data after the BLK is transformed to the frequency domain;

and the sending unit is used for generating a target PPDU according to the target BLK and sending the target PPDU to receiving end equipment.

16. The apparatus of claim 15,

the dividing unit sequentially divides the data group to obtain the L initial sub-blocks;

alternatively, the first and second electrodes may be,

interleaving and dividing the data group to obtain the L initial sub-blocks;

alternatively, the first and second electrodes may be,

17. The apparatus according to claim 15 or 16,

the determining unit determines a candidate phase rotation signal group from among a plurality of phase rotation signals, and selects a phase rotation signal of each of the L initial sub-blocks from among the candidate phase rotation signal group so that a peak-to-average ratio of frequency domain data transformed into a frequency domain by data multiplied by the L initial sub-blocks respectively by the corresponding phase rotation signals is minimized.

18. The apparatus of claim 17, wherein the plurality of sets of phase-rotated signals comprises: e.g. of the type^j*(0*π),e^j*(0.5*π),e^j*(1*π),e^j*(1.5*π)And e^j*(0.25*π),e^j*(0.75*π),e^j*(1.25*π),e^j*(1.75*π)。

19. An apparatus for transmitting data for a wireless local area network, comprising:

an obtaining unit, configured to multiply the data symbol of each initial sub-block with the phase rotation signal of each initial sub-block to obtain a target sub-block of each initial sub-block, where a first pilot symbol is transmitted at a reserved symbol position of a first target sub-block in all target sub-blocks, the first pilot symbol is used to estimate the phase rotation signal of the first initial sub-block, and a known transform form of the first pilot symbol is transmitted at a reserved symbol position of other target sub-blocks except the first target sub-block in all target sub-blocks, where the known transform form is used by a receiving end to estimate phase rotation signals of other initial sub-blocks according to the transform form;

20. The apparatus of claim 19,

alternatively, the first and second electrodes may be,

interleaving and dividing the data group to obtain the L initial sub-blocks;

alternatively, the first and second electrodes may be,

21. The apparatus according to claim 19 or 20,

22. The apparatus of claim 21, wherein the plurality of sets of phase-rotated signals comprises: e.g. of the type^j*(0*π),e^j*(0.5*π),e^j*(1*π),e^j*(1.5*π)And e^j*(0.25*π),e^j*(0.75*π),e^j*(1.25*π),e^j*(1.75*π)。

23. An apparatus for transmitting data for a wireless local area network, comprising:

a determining unit configured to determine a candidate phase rotation signal group from among a plurality of groups of phase rotation signals, the phase rotation signal of each of the L initial sub-blocks being selected from among the candidate phase rotation signal group;

a combining unit, configured to combine a target sub-block of the L initial sub-blocks and the GI to obtain a target BLK, where a peak-to-average ratio of frequency domain data after the target BLK is transformed to a frequency domain is smaller than a peak-to-average ratio of frequency domain data after the BLK is transformed to the frequency domain, peak-to-average ratios of frequency domain data after the L initial sub-blocks are respectively multiplied by corresponding phase rotation signals and transformed to the frequency domain are minimum, data in the target BLK is an imaginary signal, the multiple groups of phase rotation signals include an imaginary phase rotation signal group, and when the data in the target BLK is the imaginary signal, the candidate phase rotation signal group is the imaginary phase rotation signal group;

24. The apparatus of claim 23,

alternatively, the first and second electrodes may be,

interleaving and dividing the data group to obtain the L initial sub-blocks;

alternatively, the first and second electrodes may be,

25. The apparatus of claim 23 or 24, wherein the plurality of sets of phase rotated signals comprises: e.g. of the type^j ^*(0*π),e^j*(0.5*π),e^j*(1*π),e^j*(1.5*π)And e^j*(0.25*π),e^j*(0.75*π),e^j*(1.25*π),e^j*(1.75*π)。

26. An apparatus for transmitting data for a wireless local area network, comprising:

a determining unit, configured to estimate phase rotation signals of all initial sub-blocks according to pilot signals of all target sub-blocks, wherein the phase rotation signal of a first initial sub-block is estimated according to pilot symbols of the first target sub-block; estimating a difference value between a phase rotation signal of the corresponding initial sub-block and a phase rotation signal of a previous initial sub-block according to pilot symbols of other target sub-blocks, and determining the phase rotation signals of the other initial sub-blocks according to the difference value and the phase rotation signal of the first initial sub-block, wherein each target sub-block is a product of the phase rotation signals of the initial sub-blocks and the initial sub-blocks;

27. An apparatus for transmitting data for a wireless local area network, comprising:

a determining unit, configured to estimate phase rotation signals of all initial sub-blocks according to pilot signals of all target sub-blocks, wherein the phase rotation signal of a first initial sub-block of all initial sub-blocks is estimated according to a first pilot symbol of the first target sub-block of all target sub-blocks; estimating a transformation form of a phase rotation signal of a corresponding initial sub-block relative to a phase rotation signal of the first initial sub-block according to pilot symbols of other target sub-blocks, and determining phase rotation signals of other initial sub-blocks according to the transformation form and the phase rotation signal of the first initial sub-block, wherein each target sub-block is a product of the phase rotation signals of the initial sub-block and the initial sub-block;

28. An apparatus for transmitting data for a wireless local area network, comprising:

a determining unit, configured to determine, according to a type of data in a BLK in the target PPDU, a phase rotation signal of an initial sub-block corresponding to each of the L target sub-blocks, where each target sub-block is a product of the phase rotation signals of the initial sub-block and the initial sub-block, and when the data in the BLK in the target PPDU is an imaginary signal, determine that the phase rotation signal of the initial sub-block is one of an imaginary phase selection signal group;