WO2023160314A1 - Method and apparatus for transmitting physical layer protocol data unit - Google Patents

Abstract

Provided in the embodiments of the present application are a method and apparatus for transmitting a physical layer protocol data unit. The method can comprise: a sending end generating a first synchronization header field according to a first sequence; generating a second synchronization header field according to a second sequence, wherein the maximum value of a cross-correlation value between the second sequence and the first sequence is less than a preset value; and the sending end sending a first physical layer protocol data unit (PPDU) and a second PPDU to a receiving end, wherein the first PPDU comprises the first synchronization header field, and the second PPDU comprises the second synchronization header field. In the present application, by designing a second sequence which is generated on the basis of a first sequence, it can be ensured, to the greatest possible extent, that the periodic autocorrelation between the first sequence and the second sequence is relatively good, and a periodic cross-correlation value between the first sequence and the second sequence is relatively small. Therefore, when a sending end utilizes a first sequence and a second sequence for transmission on the same channel, not only can the synchronization precision of a receiving end be improved, but the interference between the first sequence and the second sequence can also be reduced.

Description

Method and device for transmitting physical layer protocol data unit

This application claims the priority of the Chinese patent application with the application number 202210187904.4 and the application title "Method and device for transmitting physical layer protocol data unit" submitted to the China Patent Office on February 28, 2022, the entire contents of which are incorporated by reference in In this application.

technical field

The embodiments of the present application relate to the communication field, and more specifically, relate to a method and an apparatus for transmitting a physical layer protocol data unit.

Background technique

Ultra-wideband (UWB) technology is a wireless carrier communication technology that uses nanosecond-level non-sinusoidal narrow pulses to transmit data. Because the pulses used in UWB technology to transmit data are narrow and the radiation spectral density is low, UWB technology has the advantages of strong multipath resolution, low power consumption, and strong confidentiality. Communication through UWR technology has become a short-distance, high-speed wireless network. One of the most popular physical layer technologies in the network.

Since UWB technology transmits data by sending and receiving extremely narrow pulses with nanoseconds or less, synchronization between the receiving end and the sending end is very important in UWB technology.

In the prior art, generally, the sending end uses a sequence with better autocorrelation characteristics to generate a synchronization header field, and the receiving end uses the better autocorrelation characteristics of the sequence to perform correlation detection, thereby realizing synchronization. However, the prior art does not consider the cross-correlation characteristics between the sequences. When the sending end uses different sequences to transmit on the same channel at the same time, it may generate a large amount of interference, resulting in transmission failure.

Contents of the invention

Embodiments of the present application provide a method and device for transmitting physical layer protocol data units. The transmitting end uses different sequences for transmission, which can reduce interference between the different sequences and improve transmission performance.

In a first aspect, a method for transmitting a physical layer protocol data unit is provided, and the method may be executed by a communication device, or may also be executed by a component (such as a chip or a circuit) of the communication device, which is not limited thereto. For ease of description, the execution by the sending end device is taken as an example for description below.

The method may include: generating a first synchronization header field according to the first sequence; generating a second synchronization header field according to the second sequence, where the maximum value of the cross-correlation value between the second sequence and the first sequence is lower than a preset value; sending A first physical layer protocol data unit PPDU and a second PPDU, the first PPDU includes a first synchronization header field, and the second PPDU includes a second synchronization header field.

Optionally, sending the first PPDU and the second PPDU includes: sending the first PPDU and the second PPDU on the same channel. Based on this, when the sending end sends the first PPDU and the second PPDU on the same channel, the interference between the first PPDU and the second PPDU can be reduced, and the receiving end (such as the same receiving end or different receiving ends) can improve the The receiving capability of receiving the first PPDU and the second PPDU on the same channel.

Optionally, sending the first PPDU and the second PPDU includes: sending the first PPDU and the second PPDU at the same time. Based on this, when the sending end sends the first PPDU and the second PPDU at the same time, the interference between the first PPDU and the second PPDU can be reduced, and the receiving end (such as the same receiving end, or different receiving end) can receive the first PPDU at the same time. The reception performance of the PPDU and the second PPDU.

Optionally, the second sequence is generated based on the first sequence.

Based on the above technical solution, the maximum value of the cross-correlation value between the second sequence and the first sequence is lower than the preset value, and the interference between the first sequence and the second sequence is relatively small. The sending end generates the first synchronization header field based on the first sequence, and generates the second synchronization header field based on the second sequence, then when the sending end simultaneously sends the first PPDU containing the first synchronization header field and the second synchronization header field on the same channel When the second PPDU of the header field is used, since the maximum value of the cross-correlation value between the second sequence and the first sequence is lower than the preset value, the interference between the first PPDU and the second PPDU is small, thereby improving transmission efficiency. performance.

In a second aspect, a method for transmitting a physical layer protocol data unit is provided, and the method may be executed by a communication device, or may also be executed by a component (such as a chip or a circuit) of the communication device, which is not limited thereto. For ease of description, the implementation by the receiver device is taken as an example below for description.

The method may include: receiving a second physical layer protocol data unit PPDU, where the second PPDU includes a second synchronization header field; performing correlation detection according to the second sequence and the second synchronization header field, and the correlation between the second sequence and the first sequence The maximum value of the cross-correlation value is lower than a preset value, and the first sequence is a sequence corresponding to the first synchronization header field of the first PPDU.

Wherein, the first sequence is a sequence corresponding to the first synchronization header field of the first PPDU, which may mean that: the first sequence is a sequence used to generate the first synchronization header field included in the first PPDU.

Based on the above technical solution, the maximum value of the cross-correlation value between the second sequence and the first sequence is lower than the preset value, and the interference between the first sequence and the second sequence is relatively small. When the receiving end receives the second PPDU, since the maximum value of the cross-correlation value between the second sequence and the first sequence is lower than the preset value, even if the sending end sends the first PPDU and the second PPDU at the same time, the first PPDU can be reduced. The interference of the PPDU to the second PPDU improves the receiving performance of the second PPDU at the receiving end.

With reference to the second aspect, in some implementations of the second aspect, the method further includes: receiving a first PPDU, where the first PPDU includes a first synchronization header field; and performing correlation detection according to the first sequence and the first synchronization header field.

Based on the above technical solution, since the maximum value of the cross-correlation value between the second sequence and the first sequence is lower than the preset value, even if the sender sends the first PPDU and the second PPDU at the same time, the first PPDU and the second PPDU can be reduced. The interference between the second PPDUs improves the receiving performance of the receiving end for receiving the first PPDU and the second PPDU.

With reference to the first aspect or the second aspect, in some implementation manners, the second sequence is obtained by extending and sampling the first sequence.

Based on the above technical solution, the second sequence is obtained by extending and sampling the first sequence. For example, the second sequence can be obtained by first extending the first sequence and then sampling. The second sequence generated by extending and sampling the first sequence can achieve low cross-correlation between the first sequence and the second sequence, support concurrent transmission of multiple devices, reduce interference between devices, and improve overall network performance. throughput. In addition, the calculation is simple through verification and sampling.

In combination with the first aspect or the second aspect, in some implementations, the first sequence is and The second sequence is and The first sequence and the second sequence satisfy the following formula:

where i=[0,T].

Based on the above technical solution, the second sequence generated by the above method can make the cross-correlation value between the first sequence and the second sequence approach the theoretical limit of Sarwate's inequality.

With reference to the first aspect or the second aspect, in some implementation manners, side lobes of the periodic autocorrelation functions of the first sequence and the second sequence are the same.

Based on the above technical scheme, the sidelobe of the periodic autocorrelation function of the first sequence and the second sequence is the same, if the sidelobe of the periodic autocorrelation function of the first sequence is a constant value (such as 0), then based on the first sequence The generated side lobe of the periodic autocorrelation function of the second sequence is also a constant value (for example, 0). In this way, if the first sequence is a perfect sequence (for example, the sidelobe of the periodic autocorrelation function of the first sequence is 0), then the second sequence generated based on the first sequence is also a perfect sequence.

With reference to the first aspect or the second aspect, in some implementation manners, the side lobes of the periodic autocorrelation function of the first sequence and/or the side lobes of the periodic autocorrelation function of the second sequence are constant values.

Based on the above technical scheme, the sidelobe of the periodic autocorrelation function of the first sequence and/or the sidelobe of the periodic autocorrelation function of the second sequence is a constant value, so that the first sequence and the second sequence can have a better period Correlation, when the receiving end performs correlation detection according to the first sequence and the first synchronization header field, and performs correlation detection according to the second sequence and the second synchronization header field, synchronization can be realized according to the result of the correlation detection.

In combination with the first aspect or the second aspect, in some implementations, the first synchronization header field includes a synchronization field and a frame start delimiter field, the synchronization field is generated according to the basic symbol, and the frame start delimiter field is generated according to the basic symbol and the preset sequence Generate, base symbols are generated according to the first sequence.

In combination with the first aspect or the second aspect, in some implementations, the first sequence is a binary sequence composed of 0 and 1, or the first sequence is a binary sequence composed of 1 and -1, or the first sequence is a binary sequence consisting of 0, 1, and -1.

With reference to the first aspect or the second aspect, in some implementation manners, the first sequence and the second sequence have the same autocorrelation property.

In combination with the first aspect or the second aspect, in some implementations, the first sequence is:

{-1,0,0,0,1,-1,0,0,1,0,-1,0,1,1,-1,-1,1,-1,0,1,0,0 ,-1,1,1,0,-1,0,-1,1,-1,-1,-1,0,0,1,1,-1,0,1,-1,0,- 1,1,0,-1,-1,0,1,-1,1,-1,1,0,0,0,0,1,0,0,0,1,1,0,0, 1,-1,1,0,1,0,0,1,1,1,0,1,-1,-1,1,1,0,1,0,-1,1,1,1, -1,0,-1,-1,0,-1,-1,1,-1,-1,1,0,0,1,0,1,0,1,1,1,1,1 -1,-1,-1,-1,0,1,1,1,-1,1,-1}.

Exemplarily, the second sequence is:

{-1,0,1,0,1,-1,1,-1,1,0,0,-1,1,-1,-1,-1,-1,0,1,0,- 1,-1,0,-1,1,1,1,0,0,0,0,1,0,-1,0,0,1,1,1,-1,1,1,-1 ,1,-1,-1,0,-1,-1,1,0,0,0,1,1,-1,-1,0,1,-1,-1,0,0,- 1,0,0,0,1,-1,-1,1,0,1,0,0,1,-1,0,1,-1,1,0,1,-1,0,- 1,-1,0,0,1,0,1,0,1,1,1,0,1,0,-1,1,0,0,1,1,0,-1,-1, 1,-1,0,1,1,1,1,1,-1,-1,1,1,1}.

Combining the first aspect or the second aspect, in some implementations, the first sequence is: {0,0,-1,0,-1,-1,-1,1,1,0,-1,1 ,-1}.

Exemplarily, the second sequence is: {0,-1,-1,-1,1,-1,-1,0,0,-1,1,0,1}.

In a third aspect, an apparatus for transmitting a physical layer protocol data unit is provided, and the apparatus is used to execute the method provided in the first aspect or the second aspect. Specifically, the device may include any of the above-mentioned devices for performing the first aspect or the first aspect means a unit and/or module of the method provided by an implementation manner or the second aspect or any one of the foregoing implementation manners of the second aspect, such as a processing unit and/or a communication unit.

In an implementation manner, the apparatus is a device (such as a sending end, or a receiving end). When the apparatus is a device, the communication unit may be a transceiver, or an input/output interface; the processing unit may be at least one processor. Optionally, the transceiver may be a transceiver circuit. Optionally, the input/output interface may be an input/output circuit.

In another implementation manner, the apparatus is a chip, a chip system or a circuit used in a device (such as a sending end, or a receiving end). When the device is a chip, chip system or circuit used in equipment, the communication unit may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip, chip system or circuit, etc. ; The processing unit may be at least one processor, processing circuit or logic circuit, etc.

In a fourth aspect, there is provided a device for transmitting physical layer protocol data units, the device comprising: a memory for storing programs; at least one processor for executing computer programs or instructions stored in the memory to perform the above-mentioned first aspect or The method provided by any of the above-mentioned implementation manners of the first aspect, or the second aspect or any of the above-mentioned implementation manners of the second aspect.

In an implementation manner, the apparatus is a device (such as a sending end, or a receiving end).

In another implementation manner, the apparatus is a chip, a chip system or a circuit used in a device (such as a sending end, or a receiving end).

In a fifth aspect, the present application provides a processor configured to execute the method provided in the foregoing aspects.

For the sending and obtaining/receiving operations involved in the processor, if there is no special description, or if it does not conflict with its actual function or internal logic in the relevant description, it can be understood as the processor's output and reception, input and other operations , can also be understood as the sending and receiving operations performed by the radio frequency circuit and the antenna, which is not limited in this application.

According to a sixth aspect, there is provided a computer-readable storage medium, where the computer-readable medium stores program code for execution by a device, and the program code includes a method for executing the first aspect or any one of the above-mentioned implementation methods or The method provided by the second aspect or any one of the above-mentioned implementation manners of the second aspect.

In the seventh aspect, there is provided a computer program product containing instructions, which, when the computer program product is run on a computer, causes the computer to execute the above-mentioned first aspect or any one of the above-mentioned implementations of the first aspect or the second aspect or the second aspect. The method provided by any one of the above-mentioned implementation manners of the aspect.

In an eighth aspect, a chip is provided, the chip includes a processor and a communication interface, the processor reads the instructions stored in the memory through the communication interface, and executes the first aspect or any of the above-mentioned implementation methods of the first aspect or the second aspect Or the method provided by any one of the above-mentioned implementation manners of the second aspect.

Optionally, as an implementation, the chip further includes a memory, in which computer programs or instructions are stored, and the processor is used to execute the computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, the processor is used to execute The method provided by the first aspect or any one of the above implementations of the first aspect or the second aspect or any one of the above implementations of the second aspect.

In a ninth aspect, a communication system is provided, including the above sending end and receiving end.

Description of drawings

FIG. 1 is a schematic diagram of two application scenarios provided by this application.

Fig. 2 is a schematic diagram of a PPDU structure applicable to the embodiment of the present application.

FIG. 3 is a schematic diagram of a periodic autocorrelation function of an Ipatov sequence with a length of 31 provided by an embodiment of the present application.

FIG. 4 is a schematic diagram of a method 400 for transmitting a physical layer protocol data unit provided by an embodiment of the present application.

FIG. 5 is a schematic diagram of an apparatus 500 for transmitting a physical layer protocol data unit provided in an embodiment of the present application.

FIG. 6 is a schematic diagram of an apparatus 600 for transmitting a physical layer protocol data unit provided in an embodiment of the present application.

FIG. 7 is a schematic diagram of a chip system 700 provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

The technical solution provided by this application can be applied to a wireless personal area network (wireless personal area network, WPAN). Currently, the standard adopted by WPAN is Institute of Electrical and Electronics Engineer (IEEE) 802.15 series. WPAN can be used for communication between digital auxiliary devices in a small range such as telephones, computers, and auxiliary devices, and its working range is generally within 10 meters (m). As examples, technologies capable of supporting wireless personal area networks include, but are not limited to: Bluetooth (bluetooth), ZigBee (ZigBee), ultra wideband (UWB), infrared data association (infrared data association, IrDA) infrared connection technology, Home radio frequency (HomeRF) and so on. From the perspective of network composition, WPAN can be located at the bottom of the entire network architecture, and is used for wireless connections between devices within a small range, that is, point-to-point short-distance connections, which can be regarded as short-distance wireless communication networks. According to different application scenarios, WPAN can be divided into high rate (high rate, HR)-WPAN and low rate (low rate, LR)-WPAN, among them, HR-WPAN can be used to support various high-rate multimedia applications, including high Quality audiovisual distribution, multi-megabyte music and image file transfer, and more. LR-WPAN can be used for general business in daily life.

In WPAN, according to the communication capability of the device, it can be divided into a full-function device (full-function device, FFD) and a reduced-function device (reduced-function device, RFD). RFD is mainly used for simple control applications, such as light switches, passive infrared sensors, etc. The amount of data transmitted is small, and the transmission resources and communication resources are not occupied. The cost of RFD is low. Communication between FFDs is possible, and communication between FFDs and RFDs is also possible. Usually, RFDs do not communicate directly with each other, but communicate with FFDs, or transmit data outward through an FFD. An FFD associated with an RFD may also be referred to as the RFD's coordinator. The coordinator may also be called a personal area network (personal area network, PAN) coordinator or a central control node. The PAN coordinator is the main control node of the entire network, and there is one PAN coordinator in each ad hoc network, which is mainly used for membership management, link information management, and packet forwarding functions. Optionally, the device in this embodiment of the present application may be a device supporting multiple WPAN standards such as 802.15.4a and 802.15.4z, and the currently under discussion or subsequent versions.

In the embodiment of the present application, the above-mentioned devices may be tags, communication servers, routers, switches, bridges, computers or mobile phones, home smart devices, vehicle communication devices, wearable devices, and the like. Wearable devices can also be called wearable smart devices, which is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not only a hardware device, but also achieve powerful functions through software support, data interaction, and cloud interaction. Generalized wearable smart devices include full-featured, large-sized, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application functions, and need to cooperate with other devices such as smart phones Use, such as various smart bracelets and smart jewelry for physical sign monitoring.

In the embodiment of the present application, the above-mentioned device includes a hardware layer, an operating system layer running on the hardware layer, and An application layer that runs on top of the operating system layer. The hardware layer includes hardware such as a central processing unit (central processing unit, CPU), a memory management unit (memory management unit, MMU), and memory (also called main memory). The operating system may be any one or more computer operating systems that implement business processing through processes, for example, Linux operating system, Unix operating system, Android operating system, iOS operating system, or windows operating system. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software. Moreover, the embodiment of the present application does not specifically limit the specific structure of the execution subject of the method provided by the embodiment of the present application, as long as the program that records the code of the method provided by the embodiment of the present application can be run to provide the method according to the embodiment of the present application. For example, the execution body of the method provided by the embodiment of the present application may be FFD or RFD, or a functional module in FFD or RFD that can call a program and execute the program.

The foregoing introduction about the WPAN is only an example, and does not limit the protection scope of the embodiment of the present application.

It can be understood that the embodiments of the present application can also be used in other communication systems, for example, the fifth generation (5th generation, 5G) or new radio (new radio, NR) system, long term evolution (long term evolution, LTE) system, LTE frequency Division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) system, etc. The embodiments of the present application can also be used in future communication systems, such as sixth generation (6th generation, 6G) mobile communication systems. The embodiment of this application can also be used for device to device (device to device, D2D) communication, vehicle to everything (vehicle-to-everything, V2X) communication, machine to machine (machine to machine, M2M) communication, machine type communication ( machine type communication, MTC), and the Internet of Things (Internet of Things, IoT) communication system or other communication systems. The above-mentioned communication systems applicable to the present application are only examples, and the communication systems applicable to the present application are not limited thereto, and will be described in a unified manner here, and will not be described in detail below.

Firstly, the application scenarios applicable to this application are briefly introduced in conjunction with FIG. 1 , as follows.

FIG. 1 is a schematic diagram of two application scenarios provided by this application. The system 101 shown in (A) of Fig. 1 is a communication system of a star topology (star topology), and the system 102 shown in (B) of Fig. 1 is a communication system of a peer-to-peer topology .

As shown in (A) of FIG. 1 , the system 101 may include multiple FFDs and multiple RFDs, and the multiple FFDs and multiple RFDs may form a star topology communication system. Among them, one of the multiple FFDs is a PAN controller. In a star topology communication system, the PAN controller can transmit data with one or more other devices, that is, multiple devices can establish one-to-many or multi- One-to-one data transfer architecture.

As shown in (B) of FIG. 1 , the system 102 may include multiple FFDs and one RFD, and the multiple FFDs and one RFD may form a point-to-point topology communication system. Wherein, one of the multiple FFDs is a PAN controller, and in a point-to-point topology communication system, a many-to-many data transmission architecture can be established between multiple different devices.

It should be understood that FIG. 1 (A) and FIG. 1 (B) are simplified schematic diagrams for illustration purposes only, and do not constitute limitations on the application scenarios of the present application. For example, the system 101 and/or the system 102 may further include other FFDs and/or RFDs.

UWB technology can transmit data using nanosecond-level non-sine wave narrow pulses, which occupy a wide spectrum range. Because the pulses used by UWB technology to transmit data are narrow and the radiation spectral density is extremely low, therefore, UWB technology has the advantages of strong multipath resolution capability, low power consumption, and strong confidentiality. At present, UWB technology has been written into the IEEE 802 series of wireless standards, and the WPAN standard IEEE 802.15.4a based on UWB technology has been released, as well as its evolution version IEEE 802.15.4z. It has also been put on the agenda.

UWB technology transmits data by sending and receiving extremely narrow pulses with nanoseconds or less. Therefore, the transceiver equipment Synchronization is critical in UWB technology. The so-called synchronization of the transceiver device can be understood as the physical layer protocol data unit (physical layer protocol data unit, PPDU) is sent in the form of a pulse signal, and the receiving end receives multiple pulse signals and determines which of the multiple pulse signals starts is the PPDU it wants to receive. At present, the synchronization of the transceiver device is mainly realized through the synchronization header (SHR) in the PPDU. Specifically, the receiver can perform correlation detection on the synchronization header to determine which of the multiple received pulse signals starts from is the PPDU it wants to receive.

Fig. 2 is a schematic diagram of a PPDU structure applicable to the embodiment of the present application.

As shown in Figure 2, the PPDU includes: SHR, a physical header (physical header, PHR) and a physical layer (physical layer, PHY) bearer field (payload filed). Among them, the SHR can be used by the receiving end to perform PPDU detection and synchronization. For example, the receiving end can detect whether the sending end has sent a PPDU and the starting position of the PPDU according to the SHR. The PHR can carry physical layer indication information, which can be used to help the receiving end to correctly demodulate data. As an example, the indication information may include: modulation and coding information, PPDU length, receiver of the PPDU, and the like. The PHY bearer field carries the transmitted data.

FIG. 2 also shows the structure of the SHR. As shown in FIG. 2 , the SHR may include a synchronization (synchronization, SYNC) field and a start-of-frame delimiter (start-of-frame delimiter, SFD) field. Wherein, the SYNC field may include a plurality of repeated basic symbols S _i , the basic symbols S _i are generated by a preamble sequence, and the preamble sequence may be a ternary sequence composed of three values of {–1,0,1}, Also called Ipatov sequence. The lengths of the preamble sequences defined in the current standard 802.15 are 31, 91, and 127. Table 1, Table 2, and Table 3 are Ipatov sequences with partial lengths of 31, 91, and 127, respectively.

Table 1 Ipatov sequence with a length of 31

Table 2 Ipatov sequence with a length of 91

Table 3 Ipatov sequence with a length of 127

It can be understood that when expressing a sequence, the symbol "+" can be used to represent 1, and the symbol "-" can be used to represent -1. For example, "1" in Table 1 to Table 3 can be replaced with the symbol "+". Table 1 to Table 3 The "-1" in can be replaced by the symbol "+".

Ipatov sequences have good autocorrelation properties and can be called perfect sequences.

For ease of understanding, a brief introduction to the periodic autocorrelation function and periodic cross-correlation function of the sequence is given first.

1) Periodic autocorrelation function

Hypothetical sequence The length of is N, and the sequence sequence The periodic autocorrelation function of Can Satisfy formula 1.

Wherein, τ∈[0,N-1], a _n+τ =a _n+τ-N . When n+τ≥N, is the conjugate of a _n+τ .

sequence The maximum sidelobe R _Amax of the periodic autocorrelation function is: when τ≠0, the maximum value. Generally, in sequence design, it is hoped that the smaller R _Amax is, the better. when sequence The periodic autocorrelation function of When formula 2 is satisfied, the sequence can be called a perfect sequence.

Among them, E is the total energy of the sequence. It can be seen from formula 2 that for the sequence If τ≠0, then If τ=0, then

2) Periodic crosscorrelation function

Hypothetical sequence The length of is also N, and the sequence sequence and sequence The periodic cross-correlation function of Formula 3 can be satisfied.

R _Cmax represents the sequence and sequence The magnitude of the periodic cross-correlation function The maximum value of , R _Cmax can also be called the sequence and sequence The maximum sidelobe of the periodic cross-correlation function of . Generally, in sequence design, it is hoped that the smaller the R _Cmax of any two sequences in the sequence set, the better. For example, for the sequence and sequence , the smaller the R _Cmax , the sequence and sequence The smaller the cross-correlation value of , then the sequence and sequence There will be less interference between them.

For a sequence set containing M lengths of N, the maximum sidelobe R _Amax of the periodic autocorrelation function and the maximum sidelobe R _Cmax of the periodic cross-correlation function of the sequences in the sequence set need to satisfy the inequality (that is, Sarwate's inequality), such as formula 4.

The periodic autocorrelation function and the periodic cross-correlation function are briefly introduced above, and it can be understood that the above is only an exemplary description for ease of understanding, which is not limited in this embodiment of the present application.

FIG. 3 is a schematic diagram of a periodic autocorrelation function of an Ipatov sequence with a length of 31 provided by an embodiment of the present application.

The abscissa in Fig. 3 represents the time shift, and the ordinate represents the periodic autocorrelation value of the sequence. It can be seen from Figure 3 that the periodic autocorrelation value of the Ipatov sequence with a length of 31 is not 0 only at the origin, and is 0 elsewhere. It can be seen that the Ipatov sequence satisfies the above formula 2, so the Ipatov sequence can be called for a perfect sequence. According to the autocorrelation characteristic of the Ipatov sequence, the receiving end can use the same sequence to correlate with the received signal, and realize synchronization according to information such as the correlation peak position. For example, the receiving end detects the correlation result of the predefined sequence and the received signal. When the correlation result has a periodic peak value, it means that the synchronization header of the PPDU has been received, and the receiving end can determine the starting position of the PPDU according to the position of the peak value. The receiving end can determine the length of the PPDU and whether the data in the PPDU is data transmitted to it by the sending end according to the PHR field. If the data in the PPDU is data transmitted to the receiving end, the receiving end can further analyze the physical layer bearer field in the PPDU to obtain the data sent by the sending end; if the data in the PPDU is not the data transmitted to it, Then the receiving end does not need to parse the physical layer bearer field in the PPDU.

However, using the better autocorrelation characteristics of the Ipatov sequence to generate the synchronization header field can enhance the synchronization accuracy of the receiving end. But it does not take into account the cross-correlation characteristics between the series. When the sending end uses different sequences to transmit on the same channel at the same time, it may generate a large amount of interference, resulting in transmission failure.

In view of this, the present application provides a method and device for transmitting a physical layer protocol data unit, and the maximum value of the cross-correlation value between the second sequence and the first sequence is lower than a preset value, which can reduce the first sequence and the first sequence. The interference between the second sequences supports more concurrency, thereby improving the overall throughput of the system. Both the first sequence and the second sequence can be used to generate the synchronization header field. In this way, the sending end generates a synchronization header field of a PPDU (as marked as the first PPDU) based on the first sequence, and the sending end generates a synchronization header field of another PPDU (as marked as the second PPDU) based on the second sequence, and sends When the end sends the first PPDU and the second PPDU on the same channel at the same time, since the maximum value of the cross-correlation value between the first sequence and the second sequence is lower than the preset value, the relationship between the first PPDU and the second PPDU There is also less interference.

The method for transmitting the physical layer protocol data unit provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings. The embodiments provided in this application can be applied to the above two application scenarios shown in FIG. 1 without limitation.

FIG. 4 is a schematic diagram of a method 400 for transmitting a physical layer protocol data unit provided by an embodiment of the present application. Method 400 may include the following steps.

S410. The sending end generates a first synchronization header field according to the first sequence.

S420. The sending end generates a second synchronization header field according to the second sequence, and the maximum value of the cross-correlation value between the second sequence and the first sequence is lower than a preset value.

Wherein, the preset value may be predefined, for example. As an example, preset values such as: Alternatively, the default value is Z, where Z is greater than or equal to Among them, q represents the number of elements in the finite field, q is an odd prime number, m is an odd number, assuming that the number of elements in the first sequence is T, then

By making the maximum value of the cross-correlation value between the second sequence and the first sequence lower than the preset value, the cross-correlation between the second sequence and the first sequence can be made smaller, such as as q increases, The cross-correlation value between the second sequence and the first sequence can approach The cross-correlation between the first sequence and the second sequence is small, so the interference between the second sequence and the first sequence is also small.

The synchronization header field, such as the SHR field shown in Figure 2, can include a SYNC field and an SFD field. The SYNC field includes a plurality of repeated basic symbols S _i , and the SFD field can be extended according to the basic symbol and a preset sequence (or a specified sequence) get.

Both the first sequence and the second sequence can be used to generate the synchronization header field. For example, S _i in the first synchronization header field is generated according to the first sequence, and S _i in the second synchronization header field is generated according to the second sequence. The first sequence and the second sequence may also be referred to as preamble sequences.

It can be understood that S _i is generated according to a sequence (such as S _i in the first synchronization header field is generated according to the first sequence, and for example, S _i in the second synchronization header field is generated according to the second sequence), and S can be directly generated from the sequence. _i , or equivalently deform the sequence first, and generate S _i from the deformed sequence. As an example, the above equivalent deformation may be performing a cyclic shift operation on the sequence, or performing a reverse sequence operation on the sequence, or performing a cyclic shift and reverse sequence operation on the sequence to form a new sequence. The so-called reverse order operation can also be understood as an end-to-end reverse operation or a reverse operation. For example, the result of the reverse order operation on the sequence {a,b,c,d,e} is {e,d,c,b,a}.

It can also be understood that "generating a synchronization header field according to a sequence" (such as generating a first synchronization header field according to a first sequence, or generating a second synchronization header field according to a second sequence) can also be understood as generating a basic symbol according to a sequence, which The synchronization header field includes basic symbols; or it can also be understood as generating a PPDU according to a sequence, and the PPDU includes the synchronization header field.

in sequence As an example, an implementation method of generating a synchronization header field according to a sequence is introduced. One possible implementation, according to the sequence Generating the synchronization header field may include the following steps.

(1) pair sequence To expand, the basic symbol S _i is generated to adapt to the corresponding average pulse repetition frequency (pulse repetition frequency, PRF). The pulse repetition frequency refers to the number of pulses transmitted per second, which is the reciprocal of the pulse repetition interval (PRI). The pulse repetition interval is the time interval between one pulse and the next.

As an example, the process of generating S _i is expressed mathematically as follows:

in, Represents the Kronecker product, δ _L (n) is a Delta function, which can also be called a unit impulse function, N is the length of the Delta function.

(2) According to the standard, the basic symbol is repeated for a specified number of times K to obtain the synchronization field SYNC. That is, SYNC={S _i , S _i , . . . , S _i }. K is a positive integer.

(3) Adding an SFD field, where the SFD field can be obtained by extending the basic symbol S _i through a preset sequence. As an example, the preset sequence could be {0,1,0,1,1,0,0,1}, then

Based on the above steps, the synchronization header field SHR can be obtained as: SHR=[SYNC, SFD]=[S _i , S _i , . . . , S _i , SFD].

The sending end generates the first synchronization header field according to the first sequence, and generates the second synchronization header field according to the second sequence, both of which may refer to the above steps.

It can be understood that in step (1), according to the sequence When generating the basic symbol S _i , the sequence can be carry out equivalent deformation, get the sequence The equivalent deformation sequence of , and then generate S _i according to the equivalent deformation sequence. Among them, the equivalent deformation includes the sequence Perform cyclic shift operations and/or and reverse order operations.

It can also be understood that the SFD can have many different designs, and the step (3) is only used as an example, and the embodiment of the present application does not limit it.

It can also be understood that the embodiment of the present application is mainly described by taking the sender generating the first synchronization header field according to the first sequence and generating the second synchronization header field according to the second sequence as an example, which is not limited thereto. For example, the sending end may also generate the first basic symbol according to the first sequence, and generate (or obtain) the second basic symbol according to the first basic symbol, the first basic symbol is the basic symbol corresponding to the first PPDU, and the second basic symbol is The basic symbol corresponding to the second PPDU. For another example, the sending end may also generate the first synchronization header field according to the first sequence, and obtain the second synchronization header field according to the first synchronization header field.

The possible forms and generation methods of the first sequence and the second sequence will be described in detail later.

S430. The sending end sends the first PPDU and the second PPDU.

Wherein, the first PPDU includes a first synchronization header field, and the second PPDU includes a second synchronization header field. Correspondingly, the receiving end receives the first PPDU and the second PPDU.

Optionally, the first PPDU and the second PPDU may be transmitted through the same channel (eg, denoted as a target channel). In this way, when the sending end sends the first PPDU and the second PPDU on the same channel, the interference between the first PPDU and the second PPDU can be reduced, and the receiving end (such as the same receiving end or different receiving ends) can improve the The receiving performance of receiving the first PPDU and the second PPDU on the same channel.

Optionally, the first PPDU and the second PPDU may be transmitted simultaneously. In this way, when the sending end sends the first PPDU and the second PPDU at the same time, the interference between the first PPDU and the second PPDU can be reduced, and the receiving end (such as the same receiving end or different receiving ends) can receive the first PPDU simultaneously. and the reception performance of the second PPDU.

It can be understood that the simultaneous transmission of the first PPDU and the second PPDU means that the sending end sends the first PPDU and the second PPDU at the same time. Sending at the same time may be sending at the same time, or may be sending at the same time period (or the same time range), which is not limited.

It can also be understood that the first PPDU and the second PPDU can also be transmitted simultaneously through the same channel. In this way, when the sending end sends the first PPDU and the second PPDU on the same channel at the same time, the interference between the first PPDU and the second PPDU can be reduced, and the receiving end (such as the same receiving end or different receiving ends) can be improved. The receiving capability of receiving the first PPDU and the second PPDU simultaneously on the same channel.

The structure of the PPDU may be similar to the structure shown in FIG. 2 , including the SHR field, the PHR field and the PHY bearer field, which will not be repeated here.

For example, in step 430, the receiving end receives the first PPDU and the second PPDU; or, the first receiving end receives the first PPDU, and the second receiving end receives the second PPDU; or, the first receiving end receives the first PPDU and the second PPDU, the second receiving end receives the first PPDU and the second PPDU, which is not limited. For ease of description, the following mainly takes the receiving end receiving the first PPDU and the second PPDU as an example for illustration.

Optionally, the PPDU is sent in the form of a pulse signal, and the receiving end receives the PPDU sent by the sending end on the target channel. For example, the sending end sends the first PPDU and the second PPDU on the target channel at the same time, and the receiving end receives the first PPDU and the second PPDU on the target channel. Wherein, the target channel may be a channel defined by the protocol, or a channel pre-configured by the transceiver device. As an example, the channel numbers are 0-15, and the target channel can be any one of the 0-15 channels.

S440, the receiving end performs correlation detection according to the first sequence and the first synchronization header field, and performs correlation detection according to the second sequence and the second synchronization header field.

As mentioned above, if different receivers receive the first PPDU and the second PPDU, for example, the first receiver receives the first PPDU and the second receiver receives the second PPDU, then the first receiver receives the first sequence and the first synchronization The header field performs correlation detection, and the second receiving end performs correlation detection according to the second sequence and the second synchronization header field.

Based on the embodiment of the present application, if the maximum value of the cross-correlation value between the second sequence and the first sequence is lower than a preset value, then the interference between the first sequence and the second sequence is relatively small. The sending end generates the first synchronization header field based on the first sequence, and generates the second synchronization header field based on the second sequence, then when the sending end simultaneously sends the first PPDU containing the first synchronization header field and the second synchronization header field on the same channel When the second PPDU of the header field is used, since the maximum value of the cross-correlation value between the second sequence and the first sequence is lower than the preset value, the interference between the first PPDU and the second PPDU is small, thereby improving transmission efficiency. performance.

Optionally, the correlation detection in step S440 may be auto-correlation detection or cross-correlation detection, and the specific method of correlation detection is not limited in this embodiment of the present application. According to the correlation detection result, the receiving end can determine whether the PPDU is detected and the position of the PPDU.

Take the receiving end performing correlation detection according to the first sequence and the first synchronization header field as an example. For example, the receiving end may also use the predefined first sequence to perform autocorrelation with the first sequence in the received first synchronization header field. When a periodic peak appears in the autocorrelation result, it means that the synchronization header of the first PPDU has been received, and the receiving end can determine the starting pulse position of the first PPDU according to the position where the peak occurs. In this way, by utilizing the periodic autocorrelation property of the first sequence, the synchronization of the transmitting and receiving end devices can be realized. The above is only an example, and the specific method for determining synchronization according to the correlation detection result may use a technology known or newly developed by those skilled in the art, which is not limited in this application. Regarding the manner in which the receiving end performs correlation detection according to the second sequence and the second synchronization header field, reference may be made to the manner in which the receiving end performs correlation detection according to the first sequence and the first synchronization header field, which will not be repeated here.

The embodiment of the present application does not limit the manner in which the receiving end acquires the first sequence and the second sequence. As a possible situation, the receiving end can use the predefined first sequence and the second sequence. For example, the receiving end obtains the first sequence and the second sequence from the sending end in advance, and the receiving end determines the first A sequence and a second sequence. As another possible situation, the receiving end can use a predefined first sequence and generate a second sequence based on the first sequence. The definition determines this first sequence.

Optionally, the method 400 further includes: the receiving end parses the first PPDU and the second PPDU.

Take parsing of the first PPDU at the receiving end as an example. For example, when the receiving end receives the first synchronization header field, the receiving end may continue to receive pulses, that is, receive the PHR field and the physical layer bearer field of the first PPDU. The receiving end can parse the PHR field, so as to determine the length of the first PPDU and whether the data in the first PPDU is the data transmitted to it by the sending end. When the data in the first PPDU is data transmitted to it, the receiving end can continue to analyze the physical layer bearer field in the first PPDU to obtain the data sent by the sending end; when the data in the first PPDU is not transmitted to it When transmitting data, the receiving end does not need to parse the physical layer bearer field in the first PPDU. As an example, when a non-periodic peak occurs in the correlation detection result, the receiving end determines that the first PPDU has not been received, and the receiving end will continue to receive bursts, but will not parse the received bursts. For the specific parsing method, reference may be made to the existing description, which is not limited. In addition, as for the manner in which the receiving end parses the second PPDU, reference may be made to the manner in which the receiving end parses the first PPDU, which will not be repeated here.

The related schemes of the first sequence and the second sequence are introduced below.

Optionally, the first sequence and the second sequence have the same autocorrelation property. For example, both the first sequence and the second sequence are perfect sequences.

Optionally, the sidelobe of the periodic autocorrelation function of the first sequence and/or the second sequence is a constant value, in other words, the periodic autocorrelation function has a unique peak value, and the peak value is greater than the constant value. For example, the constant value can be -1 or 0. Optionally, the constant value may also be other values, which are not limited in this embodiment of the present application. Taking Figure 3 as an example, the sidelobe of the periodic autocorrelation function of the Ipatov sequence is a constant value, that is, the periodic autocorrelation function of the Ipatov sequence has a unique peak value, and the sidelobes of the periodic autocorrelation function are the same, that is, they are all 0.

It can be understood that the sidelobe of the periodic autocorrelation function is a constant value, and may also be replaced by the autocorrelation value of the periodic autocorrelation function (or the autocorrelation value of the sidelobe of the periodic autocorrelation function) being a constant value.

In a possible situation, the first sequence is an Ipatov sequence.

Optionally, the second sequence is obtained by extending and sampling the first sequence. For example, the second sequence can be obtained by first extending the first sequence and then sampling. The second sequence generated by extending and sampling the first sequence can achieve low cross-correlation between the first sequence and the second sequence, support concurrent transmission of multiple devices, reduce interference between devices, and improve overall network performance. throughput.

Extending, or may be referred to as extending, extending, extending, etc., by extending the first sequence, the length of the extended first sequence can be made longer. For example, assuming that the length of the first sequence is T, then by performing extension processing on the first sequence, the length of the first sequence after the extension processing is greater than T, such as 2T. For example, denote the first sequence as and Then the first sequence after extending the first sequence can be expressed as

Sampling, or may be referred to as extraction, extraction, etc., can make the length of the second sequence the same as that of the first sequence by performing sampling processing on the first sequence. For example, assuming that the length of the first sequence is T, and the length of the first sequence after the first sequence is extended is 2T, then by sampling the extended first sequence, after sampling, The length of the sequence (that is, the second sequence) is the same as the length of the first sequence, both are T.

A possible implementation, the first sequence is denoted as and The second sequence is denoted as and first sequence and the second sequence Formula 5 can be satisfied. In other words, the second sequence can be generated according to Equation 5

It can be seen from formula 5 that if 2i<T, then t _i =s _2i ; if 2i>T, then t _i =-s _2i . The second sequence generated based on formula 5 with the first sequence They have the same length and have the same periodic autocorrelation characteristics, and can also be used to generate SHR for synchronization or channel estimation. For example, if the first sequence is a perfect sequence, such as the first sequence The periodic autocorrelation function of satisfies Equation 2, then the second sequence generated based on Equation 5 The periodic autocorrelation function of also satisfies Equation 2, which is also perfect sequence.

By extending and sampling the first sequence to generate the second sequence, the cross-correlation value between the first sequence and the second sequence can be small, even close to the theoretical limit of Sarwate's inequality. Below to use the above formula 5 to generate the second sequence As an example, simply verify the cross-correlation between the first series and the second series.

Assuming the first sequence Consists of at least two items of -1, 0 or 1, and satisfies Formula 6.

It can be known from formula 6 that if Tr(α ⁱ )=β ^k , then s _i =(-1) ^i+k ; if Tr(α ⁱ )=0, then s _i =0. Wherein, Tr(x) represents a mapping from GF(q _m ) to GF(q), and Tr(x) can satisfy Formula 7.

Explanations regarding the parameters in the above-mentioned formulas 6 and 7 are as follows.

GF(q) represents a finite field whose number of elements is q, where GF represents a Galois Field (Galois Field, GF). If any non-zero element in the finite field can be written as β ^k , β is an element in the finite field, and k is an integer, then the element β can be called a primitive element (or primitive element). q is an odd prime number, m is an odd number, _α is an original element on GF(q ^m ), and β=α ^T is an original element on GF(q).

Assuming the first sequence Generate the second sequence according to formula 5 first sequence and the second sequence The cross-correlation of is shown in Equation 8.

where, δ=α ^τ , In the embodiment of this application, use represents an element over a finite field containing q elements, Represents a nonzero element over a finite field containing q elements. Equation 9 on behalf of GF(q _m ) does not The number of identical solutions.

Assume that Equation 9 has the same number of solutions as Equation 10, denoted as F.

So, Can be expressed as formula 11.

also because:

Therefore, (N _1,1 +N _2,2 -N _1,2 -N _2,1 ) can be expressed as Formula 12.

It can be seen from formula 12 that the value of (N _1,1 +N _2,2 -N _1,2 -N _2,1 ) can be: 2q ^(m-1)/2 , -2q ^(m-1)/2 , 0, that is, the first sequence and the second sequence There are three mutual values of . For example, if Tr(x ⁴ -δx ² ) or Tr(x ⁴ +δx ² ) is (m-1), then (N _1,1 +N _2,2 -N _1,2 -N _2,1 ) =±2q ^(m−1)/2 , otherwise (N _1,1 +N _2,2 −N _1,2 −N _2,1 )=0.

Assuming the first sequence and the second sequence The sidelobe of the periodic autocorrelation function of is 0, according to Sarwate's inequality (ie Equation 4), we can see that the first sequence and the second sequence The maximum sidelobe R _Cmax of the periodic cross-correlation function satisfies Equation 13.

From formula 12, we can see that the first sequence and the second sequence cross-correlation value Or ±q ^(m-1)/2 , R _Cmax means the first sequence and the second sequence cross-correlation value The maximum value of , therefore, When q increases, It can be infinitely close to the theoretical limit qm-1 of Sarwate's inequality.

Based on the above derivation, it can be seen that the first sequence (such as Ipatov sequence) with better periodic autocorrelation is used to extend and sample the first sequence to obtain the second sequence (such as another Ipatov sequence), so that the first sequence The cross-correlation between the second sequence and the second sequence is very small, which can be close to the theoretical limit, thereby supporting concurrent transmission of multiple devices, reducing interference between devices, and improving the throughput of the entire network.

The above mainly introduces that when the second sequence is generated based on the first sequence, the cross-correlation between the first sequence and the second sequence can be If it is very small, for example, the maximum value of the cross-correlation value between the first sequence and the second sequence may be lower than a preset value. The possible forms of the first sequence and the second sequence are given below.

As an example, the first sequence can be any sequence in Table 1 to Table 3 (as presented in the table form of Table 1 to Table 3 above); or the first sequence can also be other sequences, such as the perfect sequence satisfying formula 2 sequence.

As an example, the second sequence may be any sequence generated based on the first sequence, as long as the maximum value of the cross-correlation value between the first sequence and the second sequence is lower than a preset value. Wherein, the second sequence may be presented in a form similar to the first sequence (for example, the second sequence may also be presented in a table form similar to Table 1 to Table 3 above).

The first sequence is given below and the second sequence The two possible forms of , the second sequence It can be obtained based on the above formula 6.

One possible form is as follows.

first sequence for:

{-1,0,0,0,1,-1,0,0,1,0,-1,0,1,1,-1,-1,1,-1,0,1,0,0 ,-1,1,1,0,-1,0,-1,1,-1,-1,-1,0,0,1,1,-1,0,1,-1,0,- 1,1,0,-1,-1,0,1,-1,1,-1,1,0,0,0,0,1,0,0,0,1,1,0,0, 1,-1,1,0,1,0,0,1,1,1,0,1,-1,-1,1,1,0,1,0,-1,1,1,1, -1,0,-1,-1,0,-1,-1,1,-1,-1,1,0,0,1,0,1,0,1,1,1,1,1 -1,-1,-1,-1,0,1,1,1,-1,1,-1}.

second sequence for:

{-1,0,1,0,1,-1,1,-1,1,0,0,-1,1,-1,-1,-1,-1,0,1,0,- 1,-1,0,-1,1,1,1,0,0,0,0,1,0,-1,0,0,1,1,1,-1,1,1,-1 ,1,-1,-1,0,-1,-1,1,0,0,0,1,1,-1,-1,0,1,-1,-1,0,0,- 1,0,0,0,1,-1,-1,1,0,1,0,0,1,-1,0,1,-1,1,0,1,-1,0,- 1,-1,0,0,1,0,1,0,1,1,1,0,1,0,-1,1,0,0,1,1,0,-1,-1, 1,-1,0,1,1,1,1,1,-1,-1,1,1,1}.

Another possible form is as follows.

The first sequence is: {0,0,-1,0,-1,-1,-1,1,1,0,-1,1,-1}. The second sequence is: {0,-1,-1,-1,1,-1,-1,0,0,-1,1,0,1}.

It can be understood that the first sequence listed above and the second sequence It is only an example, and this embodiment of the present application is not limited thereto. As mentioned above, the corresponding second sequence generated from the first sequence may be pre-specified in the standard, and its presentation form may refer to the first sequence. For example, second sequences of different lengths are represented by different tables, and the same table may include second sequences corresponding to different channels, such as referring to the forms of Table 1 to Table 3.

It can be understood that the term "and/or" in this article is only an association relationship describing associated objects, which means that there can be three relationships, for example, A and/or B, which can mean: A exists alone, and A and B exist at the same time , there are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

It can also be understood that the "plurality" herein may include two or more than two.

It can also be understood that in some of the above embodiments, "transmission" is mentioned, and in the case of no special description, transmission includes receiving and/or sending. For example, transmitting a signal may include receiving a signal and/or sending a signal.

It can also be understood that in some of the foregoing embodiments, "generation" is mentioned, such as generating the second sequence based on the first sequence. "Generate" can also be replaced with: "obtain", or "determined", or "obtain" and so on.

It can also be understood that the formulas involved in the various embodiments of the present application are illustrative descriptions, which do not limit the protection scope of the embodiments of the present application. In the process of calculating the parameters involved in the above, it can also be calculated according to the above formula, or based on the deformation of the above formula, or according to the formula determined by the method provided in the embodiment of the present application, or can also be calculated according to other methods Perform calculations to satisfy the result calculated by the formula.

It should also be understood that, in some of the foregoing embodiments, "predefined" is mentioned, which may be understood as defined in a standard.

It can also be understood that the sending end mentioned in each embodiment of the present application refers to a device that sends a signal (such as sending a PPDU), and the receiving end refers to a device that receives a signal (such as receiving a PPDU). Quantity is not limited. For example, both the sending end and the receiving end are one, for example, one sending end sends the first PPDU and the second PPDU, and one receiving end receives the first PPDU and the second PPDU. For another example, there is one sending end and two receiving ends, for example, one sending end sends the first PPDU and the second PPDU, one receiving end receives the first PPDU, and the other receiving end receives the second PPDU.

It can also be understood that some optional features in the embodiments of the present application may not depend on other features in some scenarios, or may be combined with other features in some scenarios, which is not limited.

It can also be understood that the solutions in the various embodiments of the present application can be used in a reasonable combination, and explanations or descriptions of various terms appearing in the embodiments can be referred to or interpreted in each embodiment, which is not limited.

It can also be understood that in each of the above method embodiments, the methods and operations implemented by the transmitting end device can also be implemented by components (such as chips or circuits) that can be implemented by the transmitting end device; in addition, the methods and operations implemented by the receiving end device Operations may also be implemented by components (such as chips or circuits) of the receiving end device, which are not limited.

Corresponding to the methods provided in the foregoing method embodiments, the embodiments of the present application further provide corresponding devices, and the device includes corresponding modules for executing the foregoing method embodiments. The module can be software, or hardware, or a combination of software and hardware. It can be understood that the technical features described in the above method embodiments are also applicable to the following device embodiments.

FIG. 5 is a schematic diagram of an apparatus 500 for transmitting a physical layer protocol data unit provided in an embodiment of the present application. The device 500 includes a transceiver unit 510 and a processing unit 520 . The transceiver unit 510 may be used to implement corresponding communication functions. The transceiver unit 510 may also be called a communication interface or a communication unit. The processing unit 520 may be configured to implement corresponding processing functions, such as performing correlation detection, or generating PPDUs.

Optionally, the device 500 further includes a storage unit, which can be used to store instructions and/or data, and the processing unit 520 can read the instructions and/or data in the storage unit, so that the device implements the foregoing method embodiments actions of the device.

In the first design, the apparatus 500 may be the sending end in the foregoing embodiments, or may be a component (such as a chip) of the sending end. The device 500 can implement the steps or processes corresponding to the execution of the sending end in the above method embodiments, wherein the transceiver unit 510 can be used to perform operations related to sending and receiving of the sending end in the above method embodiments, and the processing unit 520 can be used to perform the above Operations related to the processing of the sender in the text method embodiment.

In a possible implementation manner, the processing unit 520 is configured to generate the first synchronization header field according to the first sequence; the processing unit 520 is further configured to generate the second synchronization header field according to the second sequence, and the second sequence and the first sequence The maximum value of the cross-correlation value between is lower than the preset value; the transceiver unit 510 is used to send the first physical layer protocol data unit PPDU and the second PPDU, the first PPDU includes the first synchronization header field, and the second PPDU includes the second Synchronization header field.

In the second design, the apparatus 500 may be the receiving end in the foregoing embodiments, or may be a component (such as a chip) of the receiving end. The device 500 can implement the steps or procedures corresponding to the execution of the receiving end in the above method embodiments, wherein the transceiver unit 510 can be used to perform operations related to the receiving end in the above method embodiments, and the processing unit 520 can be used to perform the above Operations related to the processing of the receiving end in the text method embodiment.

In a possible implementation manner, the transceiver unit 510 is configured to receive a second physical layer protocol data unit PPDU, and the second PPDU includes a second synchronization header field; the processing unit 520 is configured to perform according to the second sequence and the second synchronization header field Correlation detection, the maximum value of the cross-correlation value between the second sequence and the first sequence is lower than the preset value, the first sequence is the first The sequence corresponding to the first synchronization header field of the PPDU.

Optionally, the transceiver unit 510 is further configured to receive the first PPDU, and the first PPDU includes the first synchronization header field; the processing unit 520 is further configured to perform correlation detection according to the first sequence and the first synchronization header field.

In any of the above designs, for example, the second sequence is obtained by extending and sampling the first sequence.

In any of the above designs, for example, the first sequence is and The second sequence is and The first sequence and the second sequence satisfy the following formula:

where i=[0,T].

In any of the above designs, for example, the side lobes of the periodic autocorrelation functions of the first sequence and the second sequence are the same.

In any of the above designs, for example, the sidelobe of the periodic autocorrelation function of the first sequence and/or the sidelobe of the periodic autocorrelation function of the second sequence are constant values.

In any of the above designs, for example, the first synchronization header field includes a synchronization field and a frame start delimiter field, the synchronization field is generated according to the basic symbol, the frame start delimiter field is generated according to the basic symbol and a preset sequence, and the basic symbol is generated according to the The first sequence is generated.

In any of the above designs, for example, the first sequence is a binary sequence composed of 0 and 1, or the first sequence is a binary sequence composed of 1 and -1, or the first sequence is a binary sequence composed of 0, 1 And a binary sequence consisting of -1.

It should be understood that the specific process of each unit performing the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, details are not repeated here.

It should also be understood that the apparatus 500 here is embodied in the form of functional units. The term "unit" here may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor for executing one or more software or firmware programs (such as a shared processor, a dedicated processor, or a group processor, etc.) and memory, incorporated logic, and/or other suitable components to support the described functionality. In an optional example, those skilled in the art can understand that the device 500 can be specifically the sending end in the above-mentioned embodiments, and can be used to execute various processes and/or steps corresponding to the sending end in the above-mentioned method embodiments; or The device 500 may specifically be the receiving end in the foregoing embodiments, and may be used to execute each process and/or step corresponding to the receiving end in the foregoing method embodiments. To avoid repetition, details are not repeated here. The above-mentioned transceiver unit 510 may also be a transceiver circuit (for example, may include a receiving circuit and a sending circuit), and the processing unit may be a processing circuit. The apparatus in FIG. 5 may be the device in the foregoing embodiments, or may be a chip or a chip system, for example, a system on chip (system on chip, SoC). Wherein, the transceiver unit may be an input-output circuit or a communication interface; the processing unit is a processor or a microprocessor or an integrated circuit integrated on the chip. It is not limited here.

The apparatus 500 in each of the above schemes has the function of implementing the corresponding steps performed by the sending end or the receiving end in the above methods. The functions described above may be implemented by hardware, or may be implemented by executing corresponding software on the hardware. The hardware or software includes one or more modules corresponding to the above functions; for example, the transceiver unit can be replaced by a transceiver (for example, the sending unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiver computer), and other units, such as a processing unit, may be replaced by a processor to respectively perform the sending and receiving operations and related processing operations in each method embodiment.

FIG. 6 is a schematic diagram of an apparatus 600 for transmitting a physical layer protocol data unit according to an embodiment of the present application. the device 600 includes a processor 610, and the processor 610 is configured to execute computer programs or instructions stored in the memory 620, or read data/signaling stored in the memory 620, so as to execute the methods in the foregoing method embodiments. Optionally, there are one or more processors 610 .

Optionally, as shown in FIG. 6 , the device 600 further includes a memory 620, and the memory 620 is used for storing computer programs or instructions and/or data. The memory 620 can be integrated with the processor 610, or can also be set separately. Optionally, there are one or more memories 620 .

Optionally, as shown in FIG. 6 , the apparatus 600 further includes a transceiver 630, and the transceiver 630 is used for receiving and/or sending signals. For example, the processor 610 is configured to control the transceiver 630 to receive and/or send signals.

As a solution, the apparatus 600 is configured to implement the operations performed by the sending end in the above method embodiments.

For example, the processor 610 is configured to execute the computer programs or instructions stored in the memory 620, so as to implement related operations of the sending end in the various method embodiments above. For example, the method executed by the sending end in the embodiment shown in FIG. 4 .

As another solution, the apparatus 600 is configured to implement the operations performed by the receiving end in each method embodiment above.

For example, the processor 610 is configured to execute computer programs or instructions stored in the memory 620, so as to implement related operations of the receiving end in the various method embodiments above. For example, the method executed by the receiving end in the embodiment shown in FIG. 4 .

It should be understood that the processor mentioned in the embodiment of the present application may be a central processing unit (central processing unit, CPU), and may also be other general purpose processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits ( application specific integrated circuit (ASIC), off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.

It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory and/or a nonvolatile memory. Among them, the non-volatile memory can be read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically programmable Erases programmable read-only memory (electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (RAM). For example, RAM can be used as an external cache. As an example and not limitation, RAM includes the following multiple forms: static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), Double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (synchlink DRAM, SLDRAM) and direct Memory bus random access memory (direct rambus RAM, DR RAM).

It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components, the memory (storage module) may be integrated in the processor.

It should also be noted that the memories described herein are intended to include, but are not limited to, these and any other suitable types of memories.

FIG. 7 is a schematic diagram of a chip system 700 provided by an embodiment of the present application. The chip system 700 (or also called a processing system) includes a logic circuit 710 and an input/output interface (input/output interface) 720 .

Wherein, the logic circuit 710 may be a processing circuit in the chip system 700 . Logic circuit 710 can be coupled to the The storage unit invokes instructions in the storage unit, so that the chip system 700 can implement the methods and functions of the various embodiments of the present application. The input/output interface 720 may be an input/output circuit in the system on chip 700, which outputs information processed by the system on chip 700, or inputs data or signaling information to be processed to the system on chip 700 for processing.

Specifically, for example, if the chip system 700 is installed at the sending end, the logic circuit 710 is coupled to the input/output interface 720, and the logic circuit 710 can send a PPDU (such as the first PPDU, or the second PPDU) through the input/output interface 720 , the PPDU (such as the first PPDU, or the second PPDU) may be generated by the logic circuit 710 . For another example, if the chip system 700 is installed at the receiving end, the logic circuit 710 is coupled to the input/output interface 720, and the logic circuit 710 can receive a PPDU (such as the first PPDU, or the second PPDU) through the input/output interface 720. The circuit 710 parses the PPDU (such as the first PPDU, or the second PPDU).

As a solution, the chip system 700 is used to implement the operations performed by the sending end in the above various method embodiments.

For example, the logic circuit 710 is used to implement the processing-related operations performed by the sending end in the above method embodiments, for example, the processing-related operations performed by the sending end in the embodiment shown in FIG. 4 ; the input/output interface 720 is used to Realize the sending and/or receiving related operations performed by the sending end in the above method embodiments, for example, the sending and/or receiving related operations performed by the sending end in the embodiment shown in FIG. 4 .

As another solution, the chip system 700 is configured to implement the operations performed by the receiving end in the foregoing method embodiments.

For example, the logic circuit 710 is used to implement the processing-related operations performed by the receiving end in the above method embodiments, such as the processing-related operations performed by the receiving end in the embodiment shown in FIG. 4; the input/output interface 720 is used to Realize the sending and/or receiving related operations performed by the receiving end in the above method embodiments, for example, the sending and/or receiving related operations performed by the receiving end in the embodiment shown in FIG. 4 .

The embodiments of the present application further provide a computer-readable storage medium, on which computer instructions for implementing the methods executed by the device in the foregoing method embodiments are stored.

For example, when the computer program is executed by a computer, the computer can implement the methods performed by the sending end in the above method embodiments.

In another example, when the computer program is executed by a computer, the computer can implement the method executed by the receiving end in each embodiment of the above method.

The embodiments of the present application also provide a computer program product, including instructions, which, when executed by a computer, implement the methods performed by the device (such as the sending end, or the receiving end) in the above method embodiments.

The embodiment of the present application also provides a communication system, including the aforementioned sending end and receiving end.

For explanations and beneficial effects of relevant content in any of the devices provided above, reference may be made to the corresponding method embodiments provided above, and details are not repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. For example, the computer may be a personal computer, a server, or a network device. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, computer, server, or data center by wired (eg, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media. The available media may be magnetic media (eg, floppy disk, hard disk, magnetic tape), optical media (eg, DVD), or semiconductor media (eg, solid state disk (solid state disk, SSD), etc. For example, the aforementioned available media include but It is not limited to: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program codes.

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims (22)

1. A method for transmitting a physical layer protocol data unit, characterized in that it comprises:

   generating a first synchronization header field according to the first sequence;

   generating a second synchronization header field according to a second sequence, where the maximum value of the cross-correlation value between the second sequence and the first sequence is lower than a preset value;

   Sending a first physical layer protocol data unit PPDU and a second PPDU, the first PPDU includes the first synchronization header field, and the second PPDU includes the second synchronization header field.
2. The method according to claim 1, characterized in that,

   The second sequence is obtained by extending and sampling the first sequence.
3. The method according to claim 1 or 2, characterized in that,

   The first sequence is and The second sequence is and The first sequence and the second sequence satisfy the following formula:
   

   where i=[0,T].
4. The method according to any one of claims 1 to 3, characterized in that,

   The sidelobes of the periodic autocorrelation functions of the first sequence and the second sequence are the same.
5. The method according to any one of claims 1 to 4, characterized in that,

   The side lobes of the periodic autocorrelation function of the first sequence and/or the side lobes of the periodic autocorrelation function of the second sequence are constant values.
6. The method according to any one of claims 1 to 5, characterized in that,

   The first synchronization header field includes a synchronization field and a frame start delimiter field, the synchronization field is generated according to a basic symbol, the frame start delimiter field is generated according to the basic symbol and a preset sequence, and the basic symbol is generated according to the Generate the first sequence described above.
7. A method according to any one of claims 1 to 6, characterized in that,

   The first sequence is a binary sequence composed of 0 and 1, or the first sequence is a binary sequence composed of 1 and -1, or the first sequence is composed of 0, 1 and -1 binary sequence.
8. A method for transmitting a physical layer protocol data unit, characterized in that it comprises:

   receiving a second physical layer protocol data unit PPDU, the second PPDU including a second synchronization header field;

   Correlation detection is performed according to the second sequence and the second synchronization header field, the maximum value of the cross-correlation value between the second sequence and the first sequence is lower than a preset value, and the first sequence is the first PPDU The sequence corresponding to the first synchronization header field.
9. The method according to claim 8, characterized in that the method further comprises:

   receiving the first PPDU, the first PPDU including the first synchronization header field;

   Perform correlation detection according to the first sequence and the first synchronization header field.
10. The method according to claim 8 or 9, characterized in that,

    The second sequence is obtained by extending and sampling the first sequence.
11. A method according to any one of claims 8 to 10, wherein

    The first sequence is and The second sequence is and The first sequence and the second sequence satisfy the following formula:
    

    where i=[0,T].
12. A method according to any one of claims 8 to 11, wherein

    The sidelobes of the periodic autocorrelation functions of the first sequence and the second sequence are the same.
13. A method according to any one of claims 8 to 12, wherein

    The side lobes of the periodic autocorrelation function of the first sequence and/or the side lobes of the periodic autocorrelation function of the second sequence are constant values.
14. A method according to any one of claims 8 to 13, wherein

    The first synchronization header field includes a synchronization field and a frame start delimiter field, the synchronization field is generated according to a basic symbol, the frame start delimiter field is generated according to the basic symbol and a preset sequence, and the basic symbol is generated according to the Generate the first sequence described above.
15. A method according to any one of claims 8 to 14, wherein

    The first sequence is a binary sequence composed of 0 and 1, or the first sequence is a binary sequence composed of 1 and -1, or the first sequence is composed of 0, 1 and -1 binary sequence.
16. A device for transmitting a physical layer protocol data unit, characterized in that the device comprises: a unit for performing the method according to any one of claims 1 to 7, or a unit for performing the method according to any one of claims 8 to 7 A unit of the method of any one of 15.
17. A device for transmitting a physical layer protocol data unit, characterized in that it comprises:

    A processor, configured to execute computer instructions stored in the memory, so that the device executes: the method according to any one of claims 1 to 7 or the method according to any one of claims 8 to 15.
18. The apparatus of claim 17, further comprising the memory.
19. The device according to claim 17 or 18, wherein the device further comprises a communication interface coupled to the processor,

    The communication interface is used for inputting and/or outputting information.
20. The device according to any one of claims 17 to 19, wherein the device is a chip.
21. A computer-readable storage medium, characterized in that it is used to store a computer program, the computer program includes instructions for implementing the method according to any one of claims 1 to 7, or the computer program includes Instructions for implementing the method as claimed in any one of claims 8 to 15.
22. A computer program product, the computer program product comprising a computer program, when the computer program is run on a computer, the computer is made to perform the method according to any one of claims 1 to 7 or the method according to any one of claims 8 to 15 any one of the methods described.