CN116707581A - Method and device for transmitting physical layer protocol data unit - Google Patents

Abstract

The embodiment of the application provides a method and a device for transmitting physical layer protocol data units. The method may include: the transmitting end generates a first synchronous header field according to the first sequence; generating a second synchronous header field according to the second sequence, wherein the maximum value of the cross-correlation value between the second sequence and the first sequence is lower than a preset value; the transmitting end transmits a first physical layer protocol data unit (PPDU) and a second PPDU to the receiving end, wherein the first PPDU comprises a first synchronous header field, and the second PPDU comprises a second synchronous header field. In the application, the second sequence generated based on the first sequence can be designed so as to ensure that the periodic autocorrelation of the first sequence and the second sequence is better as much as possible and the periodic cross-correlation value between the first sequence and the second sequence is smaller. Therefore, when the transmitting end adopts the first sequence and the second sequence to transmit on the same channel, the synchronization precision of the receiving end can be improved, and the interference between the first sequence and the second sequence can be reduced.

Description

Method and device for transmitting physical layer protocol data unit

Technical Field

The embodiment of the application relates to the field of communication, and more particularly relates to a method and a device for transmitting physical layer protocol data units.

Background

Ultra Wideband (UWB) technology is a wireless carrier communication technology that uses non-sinusoidal narrow pulses at the nanosecond level to transmit data. Because the UWB technology has the advantages of strong multipath resolution capability, low power consumption, strong confidentiality and the like, the communication through the UWR technology becomes one of the hot physical layer technologies of the short-distance and high-speed wireless network.

Since UWB technology transmits data by transceiving extremely narrow pulses having nanoseconds or less, synchronization of a receiving end and a transmitting end is critical in UWB technology.

In the prior art, a transmitting end generally generates a synchronous header field by adopting a sequence with better autocorrelation characteristic, and a receiving end performs correlation detection by utilizing the better autocorrelation characteristic of the sequence so as to realize synchronization. But the prior art does not take into account the cross-correlation properties between sequences. When the transmitting end simultaneously adopts different sequences to transmit on the same channel, larger interference may occur, thereby causing transmission failure.

Disclosure of Invention

According to the method and the device for transmitting the physical layer protocol data unit, the sending end adopts different sequences to transmit, so that interference among the different sequences can be reduced, and transmission performance is improved.

In a first aspect, a method for transmitting a physical layer protocol data unit is provided, which may be performed by a communication device, or may also be performed by a component (e.g. a chip or a circuit) of the communication device, which is not limited. For convenience of description, an example will be described below as being executed by the transmitting-end apparatus.

The method may include: generating a first synchronization header field according to the first sequence; generating a second synchronous header field according to the second sequence, wherein the maximum value of the cross-correlation value between the second sequence and the first sequence is lower than a preset value; and transmitting a first physical layer protocol data unit (PPDU) and a second PPDU, wherein the first PPDU comprises a first synchronous header field, and the second PPDU comprises a second synchronous header field.

Optionally, transmitting the first PPDU and the second PPDU includes: the first PPDU and the second PPDU are transmitted on the same channel. Based on this, when the transmitting end transmits the first PPDU and the second PPDU on the same channel, the interference between the first PPDU and the second PPDU can be reduced, so as to improve the receiving performance of the receiving end (like the same receiving end, e.g. different receiving ends) for receiving the first PPDU and the second PPDU on the same channel.

Optionally, transmitting the first PPDU and the second PPDU includes: and simultaneously transmitting the first PPDU and the second PPDU. Based on this, when the transmitting end transmits the first PPDU and the second PPDU simultaneously, the interference between the first PPDU and the second PPDU can be reduced, so as to improve the receiving performance of the receiving end (like the same receiving end, e.g. different receiving ends) for receiving the first PPDU and the second PPDU simultaneously.

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

Based on the technical scheme, the maximum value of the cross correlation value between the second sequence and the first sequence is lower than a preset value, and the interference between the first sequence and the second sequence is smaller. The transmitting end generates the first synchronization header field based on the first sequence and generates the second synchronization header field based on the second sequence, so when the transmitting end simultaneously transmits the first PPDU containing the first synchronization header field and the second PPDU containing the second synchronization header field in the same channel, the interference between the first PPDU and the second PPDU is smaller because the maximum value of the cross correlation value between the second sequence and the first sequence is lower than the preset value, and the transmission performance can be improved.

In a second aspect, a method for transmitting a physical layer protocol data unit is provided, which may be performed by a communication device, or may also be performed by a component (e.g., a chip or a circuit) of the communication device, which is not limited. For convenience of description, an example will be described below as being executed by the receiving-end apparatus.

The method may include: receiving a second physical layer protocol data unit, PPDU, the second PPDU including a second synchronization header field; and carrying out correlation detection according to the second sequence and the second synchronization header field, wherein 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 a sequence corresponding to the first synchronization header field of the first PPDU.

The first sequence is a sequence corresponding to a first synchronization header field of the first PPDU, and may be expressed as follows: the first sequence is a sequence for generating a first synchronization header field included in the first PPDU.

Based on the technical scheme, the maximum value of the cross correlation value between the second sequence and the first sequence is lower than a preset value, and the interference between the first sequence and the second sequence is smaller. When the receiving end receives the second PPDU, the maximum value of the cross correlation value between the second sequence and the first sequence is lower than a preset value, so that even if the transmitting end simultaneously transmits the first PPDU and the second PPDU, the interference of the first PPDU to the second PPDU can be reduced, and the receiving performance of the receiving end for receiving the second PPDU is improved.

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

Based on the above technical scheme, 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 transmitting end simultaneously transmits the first PPDU and the second PPDU, the interference between the first PPDU and the second PPDU can be reduced, and the receiving performance of the receiving end for receiving the first PPDU and the second PPDU can be improved.

With reference to the first aspect or the second aspect, in some implementations, the second sequence is obtained by performing extension and sampling processing on the first sequence.

Based on the technical scheme, the second sequence is obtained by extending and sampling the first sequence. For example, the second sequence may be obtained by extending the first sequence and then sampling. The second sequence generated by extending and sampling the first sequence can realize that the first sequence and the second sequence have lower cross correlation, can support the concurrent transmission of multiple devices, reduce the interference among the devices and improve the throughput of the whole network. In addition, the method is simple in calculation by means of verification and sampling.

With reference to the first aspect or the second aspect, in certain implementations, the first sequence isAnd is also provided withThe second sequence is->And->The first sequence and the second sequence satisfy the following formula:

wherein i= [0, t ].

Based on the technical scheme, the second sequence generated in the mode can enable the cross-correlation value between the first sequence and the second sequence to approach the theoretical limit of Sarwate's in quality.

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

Based on the above technical solution, the side lobes of the periodic autocorrelation functions of the first sequence and the second sequence are the same, and if the side lobe of the periodic autocorrelation function of the first sequence is a constant value (e.g. 0), the side lobe of the periodic autocorrelation function of the second sequence generated based on the first sequence is also a constant value (e.g. 0). Thus, if the first sequence is a perfect sequence (e.g., the side lobe 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 implementations, a side lobe of the periodic autocorrelation function of the first sequence and/or a side lobe of the periodic autocorrelation function of the second sequence are constant values.

Based on the technical scheme, the side lobe of the periodic autocorrelation function of the first sequence and/or the side lobe of the periodic autocorrelation function of the second sequence are constant, so that the first sequence and the second sequence have better periodic correlation, and the receiving end can realize synchronization according to the correlation detection result when performing correlation detection according to the first sequence and the first synchronization header field and performing correlation detection according to the second sequence and the second synchronization header field.

With reference to 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 a base symbol, the frame start delimiter field is generated according to the base symbol and a preset sequence, and the base symbol is generated according to the first sequence.

With reference to the first aspect or the second aspect, in certain implementations, the first sequence is a binary sequence consisting of 0 and 1, or the first sequence is a binary sequence consisting 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 certain implementations, the first sequence and the second sequence have the same autocorrelation properties.

With reference to the first aspect or the second aspect, in certain 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}。

illustratively, 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}。

with reference to the first aspect or the second aspect, in certain implementations, the first sequence is: {0,0, -1,0, -1, -1, -1,1,1,0, -1,1, -1}.

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

In a third aspect, there is provided an apparatus for transmitting a physical layer protocol data unit, the apparatus being configured to perform the method provided in the first or second aspect. In particular, the apparatus may comprise means and/or modules, such as a processing unit and/or a communication unit, for performing the method provided by the first aspect or any of the above-mentioned implementations of the second aspect or second aspect.

In one implementation, the apparatus is a device (e.g., a transmitting end, as well as 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. Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.

In another implementation, the apparatus is a chip, a system-on-chip, or a circuit for use in a device (e.g., a transmitting end, and also e.g., a receiving end). When the apparatus is a chip, a system-on-chip or a circuit used in a device, the communication unit may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin, a related circuit, or the like on the chip, the system-on-chip or the circuit; the processing unit may be at least one processor, processing circuit or logic circuit, etc.

In a fourth aspect, an apparatus for transmitting a physical layer protocol data unit is provided, the apparatus comprising: a memory for storing a program; at least one processor configured to execute a computer program or instructions stored in a memory to perform the method provided by the first aspect or any one of the implementations of the second aspect or the second aspect.

In one implementation, the apparatus is a device (e.g., a transmitting end, as well as a receiving end).

In another implementation, the apparatus is a chip, a system-on-chip, or a circuit for use in a device (e.g., a transmitting end, and also e.g., a receiving end).

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

The operations such as transmitting and acquiring/receiving, etc. related to the processor may be understood as operations such as outputting and receiving, inputting, etc. by the processor, or may be understood as operations such as transmitting and receiving by the radio frequency circuit and the antenna, if not specifically stated, or if not contradicted by actual function or inherent logic in the related description, which is not limited by the present application.

In a sixth aspect, a computer readable storage medium is provided, the computer readable storage medium storing program code for execution by a device, the program code comprising instructions for performing the method provided by any one of the above-described implementations of the first aspect or the second aspect or any one of the above-described implementations of the second aspect.

In a seventh aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method provided by any one of the implementations of the first aspect or the second aspect or any one of the implementations of the second aspect or the second aspect.

An eighth aspect provides a chip comprising a processor and a communication interface, the processor reading instructions stored on a memory via the communication interface, performing the method provided by any one of the implementations of the first aspect or the second aspect or any one of the implementations of the second aspect or the second aspect.

Optionally, as an implementation manner, the chip further includes a memory, where a computer program or an instruction is stored in the memory, and the processor is configured to execute the computer program or the instruction stored in the memory, and when the computer program or the instruction is executed, the processor is configured to execute the method provided by any one of the foregoing implementation manners of the first aspect or any one of the foregoing implementation manners of the second aspect or the second aspect.

A ninth aspect provides a communication system comprising the above transmitting end and receiving end.

Drawings

Fig. 1 is a schematic diagram of two application scenarios provided by the present application.

Fig. 2 is a schematic diagram of a PPDU structure suitable for use in embodiments of the present application.

Fig. 3 is a schematic diagram of a periodic autocorrelation function of an ipatv sequence with a length of 31 according to an embodiment of the present application.

Fig. 4 is a schematic diagram of a method 400 for transmitting a physical layer protocol data unit according to an embodiment of the present application.

Fig. 5 is a schematic diagram of an apparatus 500 for transmitting a physical layer protocol data unit according to an embodiment of the present application.

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.

Fig. 7 is a schematic diagram of a chip system 700 according to an embodiment of the present application.

Detailed Description

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

The technical scheme provided by the application can be applied to wireless personal area networks (wireless personal area network, WPAN). The standard currently adopted by WPAN is the institute of electrical and electronics engineers (institute of electrical and electronics engineer, IEEE) 802.15 family. WPAN can be used for communication between digital auxiliary devices in small areas such as telephones, computers, accessory devices, etc., which are typically operated within a range of i 0 meters (m). As an example, technologies capable of supporting wireless personal area networks include, but are not limited to: bluetooth (blue), zigBee (ZigBee), ultra Wideband (UWB), infrared data standards association (infrared data association, irDA) infrared connection technology, home radio frequency (HomeRF), and the like. From a network configuration perspective, a WPAN may be located at the bottom layer of the overall network architecture, and a wireless connection between devices within a small range, i.e., a point-to-point short-range connection, may be considered a short-range wireless communication network. Depending on the application scenario, WPANs may be classified into High Rate (HR) -WPANs and Low Rate (LR) -WPANs, wherein HR-WPANs may be used to support various high rate multimedia applications including high quality audio-visual distribution, multi-megabyte music, and image document delivery, among others. LR-WPAN can be used for general business of daily life.

In WPAN, full-function devices (FFDs) and reduced-function devices (RFDs) can be classified according to communication capabilities possessed by the devices. The RFD is mainly used for simple control applications, such as switching of a lamp, a passive infrared sensor and the like, has less transmitted data volume, occupies less transmission resources and communication resources, and has lower cost. The FFDs can communicate with each other, and the FFDs can also communicate with the RFDs. Typically, the RFDs do not communicate directly with each other, but rather communicate with the FFD, or forward data out through one FFD. The FFD associated with an RFD may also be referred to as a coordinator (coordinator) of the RFD. The coordinator may also be referred to as a personal area network (personal area network, PAN) coordinator or central control node, etc. The PAN coordinator is a master control node of the whole network, and one PAN coordinator is arranged in each ad hoc network and is mainly used for membership management, link information management and packet forwarding functions. Alternatively, the device in the embodiments of the present application may be a device that supports multiple WPAN systems, such as 802.15.4a and 802.15.4z, and the current or subsequent versions.

In the embodiment of the application, the device can be a tag, a communication server, a router, a switch, a network bridge, a computer or a mobile phone, a home intelligent device, a vehicle-mounted communication device, a wearable device and the like. The wearable device can also be called as a wearable intelligent device, and is a generic name for intelligently designing daily wear by applying wearable technology and developing wearable devices, such as glasses, gloves, watches, clothes, shoes and the like. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in combination with other devices, such as smart phones, for example, various smart bracelets, smart jewelry, etc. for physical sign monitoring.

In the embodiment of the application, the device comprises a hardware layer, an operating system layer running on the hardware layer and an application layer running on 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 a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processes through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address book, word processing software, instant messaging software and the like. Further, the embodiment of the present application is not particularly limited to the specific structure of the execution body of the method provided by the embodiment of the present application, as long as the communication can be performed by the method provided according to the embodiment of the present application by running the program recorded with the code of the method provided by the embodiment of the present application, and for example, the execution body of the method provided by the embodiment of the present application may be an FFD or an RFD, or a functional module in the FFD or the RFD that can call the program and execute the program.

The above description of WPAN is merely illustrative and does not limit the scope of the embodiments of the present application.

It will be appreciated that embodiments of the present application may also be used in other communication systems, such as fifth generation (5th generation,5G) or New Radio (NR) systems, long term evolution (long term evolution, LTE) systems, LTE frequency division duplex (frequency division duplex, FDD) systems, LTE time division duplex (time division duplex, TDD) systems, and the like. The embodiment of the application can also be used for future communication systems, such as a sixth generation (6th generation,6G) mobile communication system. Embodiments of the present application may also be used for device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, machine-to-machine (machine to machine, M2M) communication, machine type communication (machine type communication, MTC), and internet of things (internet of things, ioT) communication systems or other communication systems. The above-mentioned communication system to which the present application is applied is merely illustrative, and the communication system to which the present application is applied is not limited thereto, and is generally described herein, and will not be described in detail.

First, an application scenario suitable for the present application will be briefly described with reference to fig. 1, as follows.

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

As shown in fig. 1 (a), a plurality of FFDs and a plurality of RFDs may be included in the system 101, which may form a star topology communication system. Wherein, one FFD of the FFDs is a PAN controller, and in a star topology communication system, the PAN controller can perform data transmission with one or more other devices, i.e. the plurality of devices can establish a one-to-many or many-to-one data transmission architecture.

As shown in fig. 1 (B), a plurality of FFDs and one RFD may be included in the system 102, which may form a communication system of a point-to-point topology. Wherein, one FFD of the plurality of FFDs is a PAN controller, and a many-to-many data transmission architecture can be established among a plurality of different devices in a communication system with point-to-point topology.

It should be understood that (a) of fig. 1 and (B) of fig. 1 are simplified schematic diagrams merely illustrated for easy understanding, and do not constitute a limitation on the application scenario of the present application. For example, other FFDs and/or RFDs, etc. may also be included in the system 101 and/or 102.

UWB technology can transmit data using non-sinusoidal narrow pulses on the order of nanoseconds, which occupy a wide range of frequency spectrum. Because the UWB technology adopts narrower pulse and extremely low radiation spectrum density to transmit data, the UWB technology has the advantages of strong multipath resolution capability, low power consumption, strong confidentiality and the like. Currently, UWB technology has been written in the IEEE802 series wireless standard, the WPAN standard IEEE 802.15.4a based on UWB technology has been released, and the formulation of the next generation WPAN standard 802.15.4ab of UWB technology has also been scheduled.

UWB technology transmits data by transceiving extremely narrow pulses having nanoseconds or less, and thus, synchronization of transceiving devices is critical in UWB technology. Synchronization of the transceiving equipment is understood to mean that the physical layer protocol data unit (physical layer protocol data unit, PPDU) is transmitted in the form of a pulse signal, the receiving end receives a plurality of pulse signals and determines from which of the plurality of pulse signals is the PPDU it is to receive. Currently, synchronization of the transceiving equipment is mainly achieved through a synchronization header (synchronization header, SHR) in the PPDU, specifically, the receiving end may perform correlation detection on the synchronization header, so as to determine from which of the received multiple pulse signals is the PPDU to be received.

Fig. 2 is a schematic diagram of a PPDU structure suitable for use in embodiments of the present application.

As shown in fig. 2, the PPDU includes: SHR, physical Header (PHR), and physical layer (PHY) bearer field (payload file). The SHR may be used for PPDU detection and synchronization by the receiving end, for example, the receiving end may detect whether the sending end sends the PPDU and a start position of the PPDU according to the SHR. The PHR may carry indication information of the physical layer that may be used to assist the receiving end in correctly demodulating data. As an example, the indication information may include: modulation coding information, PPDU length, a receiver of the PPDU, and the like. The PHY bearer field carries the transmitted data.

Fig. 2 also shows the structure of the SHR, which may include a Synchronization (SYNC) field and a start-of-frame delimiter (SFD) field, as shown in fig. 2. Wherein the SYNC field may include a plurality of repeated base symbols S _i The basic symbol S _i Generated from a preamble sequence, which may be a ternary sequence consisting of three values { -1,0,1}, also called an ipatv sequence. The preamble sequences defined in the current standard 802.15 have three lengths 31, 91 and 127, and tables 1, 2 and 3 are respectively a partial length of 31, 9 1 and 127.

TABLE 1 Itatov sequence with part length 31

TABLE 2 Itatov sequence with part length 91

TABLE 3 part length 127 Itatov sequence

It will be appreciated that in representing the sequence, 1 may be represented by the symbol "+" and-1 by the symbol "-" such that "1" in tables 1-3 may be replaced by the symbol "+" and "-1" in tables 1-3 may be replaced by the symbol "+".

The ipatv sequence has good auto-correlation properties and can be called a perfect sequence.

For ease of understanding, the periodic autocorrelation function and the periodic cross correlation function of the sequence are briefly described.

1) Periodic autocorrelation function

Hypothesized sequencesIs of length N and the sequence +.>Sequence->Periodic autocorrelation function of (2)Number of digitsEquation 1 can be satisfied.

/>

Wherein τ.epsilon.0, N-1]，a _n+τ ＝a _n+τ-N . When n+τ is greater than or equal to N,is a _n+τ Is a conjugate of (c).

Sequence(s)Maximum sidelobe R of the periodic autocorrelation function of (2) _Amax The method comprises the following steps: τ+.0 +.>Is a maximum value of (a). In general, R is desired in sequence design _Amax The smaller the better. When sequence->Is>When formula 2 is satisfied, the sequence->May be referred to as a perfect sequence.

Where E is the total energy of the sequence. As can be seen from equation 2, for the sequenceIf τ.noteq.0, then +.>If τ=0 then +.>

2) Periodic cross-correlation (periodic crosscorrelation) function

Hypothesized sequencesIs also N in length and the sequence +.>Sequence->And sequence->Is>Equation 3 can be satisfied.

R _Cmax Representing sequencesAnd sequence->Is +.>Maximum value of R _Cmax May also be referred to as the sequence->And sequence->Maximum side lobe of the periodic cross-correlation function of (c). In general, in sequence design, R is desired for any two sequences in a sequence set _Cmax The smaller the better. For example, for the sequence +.>And sequence->For R, R _Cmax The smaller the expression sequence +.>And sequence->The smaller the cross-correlation value of (2), the sequence +.>And sequence->The less interference between them.

For a sequence set containing M sequences of length N, the maximum sidelobe R of the periodic autocorrelation function of the sequences in the sequence set _Amax Maximum sidelobe R of sum-cycle cross-correlation function _Cmax Inequality (i.e., sarwate's inequality) needs to be satisfied as in formula 4.

The periodic autocorrelation function and the periodic cross correlation function are briefly described above, and it is to be understood that the above is merely illustrative for ease of understanding and that the embodiments of the present application are not limited thereto.

Fig. 3 is a schematic diagram of a periodic autocorrelation function of an ipatv sequence with a length of 31 according to an embodiment of the present application.

The abscissa in fig. 3 represents time shift, and the ordinate represents the periodic autocorrelation value of the sequence. As can be seen from fig. 3, the periodic autocorrelation value of the length-31 ipatv sequence is not 0 only at the origin and is 0 elsewhere, so it can be seen that the ipatv sequence satisfies the above formula 2, and thus the ipatv sequence can be referred to as a perfect sequence. According to the autocorrelation characteristic of the ipatv sequence, the receiving end may use the same sequence to correlate (correlation) with the received signal, and achieve synchronization according to the information such as the peak position of the correlation. 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, that is, the synchronization head of the PPDU is received, and the receiving end can determine the starting position of the PPDU according to the position of the peak value. The receiving end may determine the length of the PPDU and whether the data in the PPDU is the data transmitted thereto by the transmitting end according to the PHR field. If the data in the PPDU is the data transmitted to the receiving end, the receiving end can further analyze the physical layer bearing 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 the PPDU, the receiving end may not need to parse the physical layer bearer field in the PPDU.

However, the synchronization header field is generated by utilizing the better autocorrelation characteristic of the ipatv sequence, although the synchronization accuracy of the receiving end can be enhanced. But does not take into account the cross-correlation properties between sequences. When the transmitting end simultaneously adopts different sequences to transmit on the same channel, larger interference may occur, thereby causing transmission failure.

In view of this, the present application provides a method and apparatus for transmitting a physical layer protocol data unit, which can reduce interference between a first sequence and a second sequence by a maximum value of cross correlation values between the second sequence and the first sequence being lower than a preset value, and support more concurrency, thereby improving throughput of the whole system. Both the first sequence and the second sequence may be used to generate the sync header field. Thus, when the transmitting end generates the synchronization header field of one PPDU (e.g., denoted as a first PPDU) based on the first sequence and generates the synchronization header field of another PPDU (e.g., denoted as a second PPDU) based on the second sequence, the transmitting end simultaneously transmits the first PPDU and the second PPDU on the same channel, because the maximum value of the cross-correlation value between the first sequence and the second sequence is lower than the preset value, the interference between the first PPDU and the second PPDU is also smaller.

The method for transmitting the physical layer protocol data unit according to the embodiment of the present application will be described in detail with reference to the accompanying drawings. The embodiment provided by the application can be applied to the two application scenes shown in fig. 1, and is not limited.

Fig. 4 is a schematic diagram of a method 400 for transmitting a physical layer protocol data unit according to an embodiment of the present application. The method 400 may include the following steps.

S410, the transmitting end generates a first synchronous header field according to the first sequence.

S420, the transmitting end generates a second synchronous 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, the preset value is, for example:alternatively, the preset value is Z, wherein Z is greater than +.>Or equal to->Wherein q represents the number of elements in the finite field, q is an odd prime number, m is an odd number, and if 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 a preset valueThe cross-correlation between the second sequence and the first sequence can be made smaller, e.g. 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 smaller and thus the interference between the second sequence and the first sequence is smaller.

The synchronization header field, such as the SHR field shown in fig. 2, may include a SYNC field including a plurality of repeated base symbols S and an SFD field _i The SFD field may be extended according to a base symbol and a preset sequence (or a designated sequence).

Both the first sequence and the second sequence may be used to generate the sync header field. For example, S in the first Sync header field _i Generating according to the first sequence S in the second synchronization header field _i Generated from the second sequence. The first sequence and the second sequence may also be referred to as a preamble sequence.

It will be appreciated that S _i Based on sequence generation (e.g. S in the first Sync header field _i Generated from the first sequence, e.g. S in the second Sync header field _i Generated from the second sequence), may be the direct generation of S from the sequence _i The sequence may be subjected to equivalent transformation to generate S _i . As an example, the equivalent modification may be performing a cyclic shift operation on the sequence, performing an inverse sequence operation on the sequence, or performing a cyclic shift and an inverse sequence operation on the sequence to form a new sequence. By reverse order operation, it is also understood that the operation is reversed end-to-end or vice versa, e.g., the result of the reverse order operation for the sequence { a, b, c, d, e } is { e, d, c, b, a }.

It is further understood that "generating a synchronization header field from a sequence" (e.g. generating a first synchronization header field from a first sequence, and generating a second synchronization header field from a second sequence), may also be understood as generating a base symbol from a sequence, the synchronization header field comprising the base symbol; or may also be understood as generating a PPDU from the sequence, the PPDU including the synchronization header field.

In sequence ofFor example, an implementation is presented that generates a sync header field from a sequence. One possible implementation is according to the sequence +.>Generating the sync header field may include the following steps.

(1) Pair sequenceExpanding to generate a basic symbol S _i To adapt the corresponding average pulse repetition frequency (pulse repetition frequency, PRF). The pulse repetition frequency refers to the number of pulses transmitted per second and is the inverse of the pulse repetition interval (pulse repetition interval, PRI). The pulse repetition interval is the time interval between one pulse and the next.

By way of example, S is generated _i The process of (2) is expressed as follows:/>

wherein, the liquid crystal display device comprises a liquid crystal display device,represents the Cronecker product (Kronecker product), delta _L (n) is a Delta function, also known as unit pulse function, +.>N is the Delta function length.

(2) The base symbol is repeated a specified number of times K, as specified by the standard, to obtain a synchronization field SYNC. I.e. sync= { S _i ,S _i ,…,S _i }. K is a positive integer.

(3) Adding SFD field, which can be basic symbol S _i And (5) expanding by a preset sequence. As an example, the preset sequence may be 0,1,0,1,1,0,0,1}, then

Based on the above steps, the sync header field SHR may be obtained as: shr= [ SYNC, SFD]＝[S _i ,S _i ,…,S _i ,SFD]。

The steps can be referred to by the transmitting end generating the first synchronization header field according to the first sequence and generating the second synchronization header field according to the second sequence.

It will be appreciated that in step (1), according to the sequenceGenerating a base symbol S _i In this case, the sequence may be first of all +.>Performing equivalent transformation to obtain sequence->Is then generated according to the equivalent deformed sequence _i . Wherein the equivalent variant comprises the pair sequence->A cyclic shift operation and/or an inverse sequence operation is performed.

It will also be appreciated that SFDs may be of many different designs, and that step (3) is merely exemplary and embodiments of the present application are not limited.

It may be further understood that, in the embodiment of the present application, 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 by taking as an example and performing illustration, which is not limited. For example, the transmitting end may generate a first base symbol according to the first sequence, and generate (or obtain) a second base symbol according to the first base symbol, where the first base symbol is a base symbol corresponding to the first PPDU, and the second base symbol is a base symbol corresponding to the second PPDU. For another example, the transmitting end may generate a first synchronization header field according to the first sequence, and obtain a second synchronization header field according to the first synchronization header field.

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

S430, the transmitting end transmits 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. Accordingly, the receiving end receives the first PPDU and the second PPDU.

Alternatively, the first PPDU and the second PPDU may be transmitted over the same channel (e.g., denoted as a target channel). Thus, when the transmitting end transmits 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 performance of the receiving end (like the same receiving end, e.g. different receiving ends) for receiving the first PPDU and the second PPDU on the same channel is improved.

Alternatively, the first PPDU and the second PPDU may be transmitted simultaneously. Thus, when the transmitting end simultaneously transmits the first PPDU and the second PPDU, the interference between the first PPDU and the second PPDU can be reduced, and the receiving performance of the receiving end (like the same receiving end, for example, different receiving ends) for simultaneously receiving the first PPDU and the second PPDU is improved.

It can be understood that the first PPDU and the second PPDU are transmitted simultaneously, which means that the transmitting end transmits the first PPDU and the second PPDU simultaneously. The simultaneous transmissions may be transmitted at the same time or may be transmitted at the same time period (or the same time range), and the present invention is not limited thereto.

It is also understood that the first PPDU and the second PPDU may also be transmitted simultaneously over the same channel. Thus, when the transmitting end simultaneously transmits 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 performance of the receiving end (like the same receiving end, e.g. different receiving ends) for simultaneously receiving the first PPDU and the second PPDU on the same channel is improved.

The structure of the PPDU may be similar to that shown in fig. 2, including SHR field, PHR field, and PHY bearer field, and will not be described again here.

For example, in step 430, the receiving end receives a first PPDU and a 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, and the second receiving end receives the first PPDU and the second PPDU, which is not limited. For convenience of explanation, the following description will mainly take an example that a receiving end receives a first PPDU and a second PPDU as an example.

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, a transmitting end transmits a first PPDU and a second PPDU on a target channel at the same time, and a receiving end receives the first PPDU and the second PPDU on the target channel. The target channel may be a channel defined by a protocol, or may be a channel preconfigured by the transceiver device. As an example, the channel numbers are 0-15, and the target channel may be any one of the channels 0-15.

S440, the receiving end carries out correlation detection according to the first sequence and the first synchronous header field, and carries out correlation detection according to the second sequence and the second synchronous header field.

As described above, if the different receiving ends receive the first PPDU and the second PPDU, for example, the first receiving end receives the first PPDU and the second receiving end receives the second PPDU, the first receiving end performs correlation detection according to the first sequence and the first synchronization header field, and the second receiving end performs correlation detection according to the second sequence and the second synchronization header field.

According to the embodiment of the application, the maximum value of the cross-correlation value between the second sequence and the first sequence is lower than the preset value, so that the interference between the first sequence and the second sequence is smaller. The transmitting end generates the first synchronization header field based on the first sequence and generates the second synchronization header field based on the second sequence, so when the transmitting end simultaneously transmits the first PPDU containing the first synchronization header field and the second PPDU containing the second synchronization header field in the same channel, the interference between the first PPDU and the second PPDU is smaller because the maximum value of the cross correlation value between the second sequence and the first sequence is lower than the preset value, and the transmission performance can be improved.

Alternatively, the correlation detection in step S440 may be an autocorrelation detection or a cross correlation detection, and the embodiment of the present application is not limited with respect to the specific method of correlation detection. The receiving end can determine whether the PPDU is detected or not and the position of the PPDU according to the correlation detection result.

Taking the example that the receiving end carries out correlation detection according to the first sequence and the first synchronous header field. For example, the receiving end may also use the predefined first sequence and the first sequence in the received first synchronization header field for autocorrelation. When the autocorrelation result shows a periodic peak, that is, the synchronization head of the first PPDU is received, and the receiving end can determine the start pulse position of the first PPDU according to the position where the peak appears. Thus, by exploiting the periodic autocorrelation properties of the first sequence, synchronization of the transceiver devices can be achieved. The above is merely an example, and a specific method for determining synchronization according to the correlation detection result may use a technology known to those skilled in the art or newly developed, and the present application is not limited thereto. 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 is not described herein.

The manner in which the receiving end obtains the first sequence and the second sequence is not limited in the embodiments of the present application. As a possible scenario, the receiving end may use a predefined first sequence and a second sequence, e.g. the receiving end obtains the first sequence and the second sequence from the transmitting end in advance, and then, the receiving end predefines the first sequence and the second sequence according to a standard. As another possible scenario, the receiving end may use a predefined first sequence and generate a second sequence based on the first sequence, e.g. the receiving end obtains the first sequence from the transmitting end in advance, and then determines the first sequence according to a standard predefined by the receiving end.

Optionally, the method 400 further comprises: the receiving end analyzes the first PPDU and the second PPDU.

Take the receiving end to parse the first PPDU as an example. For example, when the receiving end receives the first synchronization header field, the receiving end may continue to receive the pulse, i.e. receive the PHR field and the physical layer bearer field of the first PPDU. The receiving end may parse the PHR field to determine the length of the first PPDU and whether the data in the first PPDU is data transmitted thereto by the transmitting end. When the data in the first PPDU is the data transmitted to the first PPDU, the receiving end can continuously analyze the physical layer bearing field in the first PPDU to obtain the data sent by the sending end; when the data in the first PPDU is not the data transmitted thereto, the receiving end may not need to parse the physical layer bearer field in the first PPDU. As an example, when the correlation detection result shows an aperiodic peak, the receiving end determines that the first PPDU is not received, and the receiving end continues to receive the pulse, but does not parse the received pulse. Reference is made to the present description for a specific parsing scheme, which is not limited. In addition, regarding 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 is not described herein again.

The correlation scheme of the first sequence and the second sequence is described below.

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

Alternatively, the side lobes of the periodic autocorrelation function of the first sequence and/or the second sequence are constant values, in other words, the periodic autocorrelation function has a unique peak, and the peak is greater than the constant value. For example, the constant value may be-1 or 0. Alternatively, the constant value may be another value, which is not limited by the embodiment of the present application. Taking fig. 3 as an example, the side lobes of the periodic autocorrelation function of the ipatv sequence are constant, i.e., the periodic autocorrelation function of the ipatv sequence has a unique peak, and the side lobes of the periodic autocorrelation function are all the same, i.e., all are 0.

It will be appreciated that the side lobes of the periodic autocorrelation function are constant values, or alternatively the autocorrelation values of the periodic autocorrelation function (or the autocorrelation values of the side lobes of the periodic autocorrelation function) are constant values.

In one possible scenario, the first sequence is an ipatv sequence.

Optionally, the second sequence is obtained by stretching and sampling the first sequence. For example, the second sequence may be obtained by extending the first sequence and then sampling. The second sequence generated by extending and sampling the first sequence can realize that the first sequence and the second sequence have lower cross correlation, can support the concurrent transmission of multiple devices, reduce the interference among the devices and improve the throughput of the whole network.

The extension, or extension, expansion, or the like, may be referred to as extending, expanding, or the like, so that the length of the first sequence after the extension may be increased by performing the extension processing on the first sequence. For example, assuming that the length of the first sequence is T, by performing the extension processing on the first sequence, the length of the first sequence after the extension processing is greater than T, for example, 2T. For example, the first sequence is noted asAnd is also provided withThe first sequence after the extension process of the first sequence can be expressed as

Sampling, alternatively referred to as decimating, extracting, etc., may cause the length of the second sequence to be the same as the length of the first sequence by sampling the first sequence. For example, assuming that the length of the first sequence is T and the length of the first sequence after the extension processing is 2T, the length of the sequence (i.e., the second sequence) obtained after the sampling processing is the same as the length of the first sequence by sampling the first sequence after the extension processing, which is both T.

One possible implementation, the first sequence is noted asAnd->The second sequence is marked asAnd->First sequence->And second sequence->Equation 5 may be satisfied. In other words, the second sequence +.Can be generated according to equation 5 >

/>

As can be seen from equation 5, if 2i<T, then T _i ＝s _2i The method comprises the steps of carrying out a first treatment on the surface of the If 2i>T, then T _i ＝-s _2i . A second sequence generated based on equation 5Is>The same length and the same period autocorrelation characteristics can also be used for generating SHR for synchronization or channel estimation. For example, if the first sequence +.>Is a perfect sequence, e.g. the first sequence +.>The periodic autocorrelation function of (2) satisfies equation (2), then the second sequence generated based on equation (5)>The periodic autocorrelation function of (2) also satisfies equation 2 and is also a perfect sequence.

By extending and sampling the first sequence to generate a second sequence, a smaller cross-correlation value between the first sequence and the second sequence can be realized, and even the theoretical limit of the samware's index can be approached. The second sequence is generated according to the above-mentioned method 5For example, the cross-correlation between the first sequence and the second sequence is simply verified.

Assuming the first sequenceIs composed of at least two of-1, 0 or 1, and satisfies formula 6.

From equation 6, it can be seen that if Tr (α ⁱ )＝β ^k Then s _i ＝(-1) ^i+k The method comprises the steps of carrying out a first treatment on the surface of the If Tr (. Alpha.) ⁱ ) =0, then s _i =0. Wherein Tr (x) represents GF (q) ^m ) One mapping to GF (q), and Tr (x) may satisfy equation 7.

The explanation about each parameter in the above-mentioned formulas 6 and 7 is as follows.

GF (q) represents a finite Field of q elements, where GF represents Galois Field (GF). If any element other than 0 in the finite field can be written as beta ^k Beta is an element in a finite field and k is an integer, then the element beta may be referred to as the original element (primitive element) (or original element). q is an odd prime number, m is an odd number,alpha is GF (q) ^m ) One original element on, β=α ^T Is an original element on GF (q).

Assuming the first sequenceGenerating the second sequence according to formula 5>First sequence->And second sequence->The cross-correlation of (2) is shown in equation 8.

Wherein δ=α ^τ ，In the embodiment of the application, F is used _q Representing an element on a finite field containing q elements,/->Representing non-zero elements on a finite field containing q elements. />Representative GF (q) ^m ) The number of different solutions of equation 9 above. />

/>

Let equation set 9 have the same number of solutions as equation set 10, denoted as F.

Then the first time period of the first time period,can be represented by formula 11.

Again because:

thus, (N) _1,1 +N _2,2 -N _1,2 -N _2,1 ) Can be represented by formula 12.

As can be seen from FIG. 12, (N) _1,1 +N _2,2 -N _1,2 -N _2,1 ) The values of (2) may be: 2q ^(m-1)/2 、-2q ^(m-1)/2 0, that is, the first sequenceAnd second sequence->Three mutually related values. 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 sequenceAnd second sequence->The side lobe of the periodic autocorrelation function of (a) is 0, and the first sequence +.>And second sequence->Maximum sidelobe R of a periodic cross-correlation function of (2) _Cmax Equation 13 is satisfied.

From formula 12, the first sequenceAnd second sequence->Cross-correlation value +.>Or + -q ^(m-1)/2 ，R _Cmax Representing the first sequence->And second sequence->Cross-correlation value +.>Maximum value of (2), therefore->When q increases, _A->Infinite approaching the theoretical limit q of Sarwate's inequality ^m-1 。

Based on the above deduction, the first sequence (such as the ipatv sequence) with better cycle autocorrelation is utilized to extend and sample the first sequence to obtain the second sequence (such as another ipatv sequence), so that the cross correlation between the first sequence and the second sequence is small, and the theoretical limit can be approached, thereby supporting multi-equipment concurrent transmission, reducing interference between equipment and improving throughput of the whole network.

In the above, mainly, when the second sequence is generated based on the first sequence, the cross-correlation between the first sequence and the second sequence may be small, e.g., the maximum value of the cross-correlation value between the first sequence and the second sequence may be lower than the preset value. Possible forms of the first sequence and the second sequence are given below.

As an example, the first sequence may be any one of tables 1 to 3 (as presented in tabular form of tables 1 to 3 above); alternatively, the first sequence may be another sequence, such as a perfect sequence satisfying equation 2.

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 made lower than a preset value. Wherein the second sequence may be referred to as being presented in a form similar to the first sequence (e.g., the second sequence may also be presented in a tabular form similar to tables 1-3 above).

The first sequence is given belowAnd second sequence->Is a second sequence +.>Can be obtained based on the above equation 6.

One possible form is as follows.

First sequenceThe method comprises the following steps:

{-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 sequenceThe method comprises the following steps:

{-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 will be appreciated that the first sequence listed aboveAnd second sequence->Merely an example, embodiments of the present application are not limited in this respect. As previously described, the corresponding second sequence is generated from the first sequence, which may be specified in advance in a standard, and the presentation form thereof may refer to the first sequence. For example, the second sequences of different lengths are represented by different tables, and the same table may include the second sequences corresponding to different channels, such as the shapes of tables 1 to 3 Formula (I).

It will be appreciated that the term "and/or" is merely one association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

It is also understood that the term "plurality" as used herein may include 2 or more than 2.

It will also be appreciated that in some of the embodiments described above, reference is made to "transmitting," which includes receiving and/or transmitting without particular reference. For example, transmitting the signal may include receiving the signal and/or transmitting the signal.

It will also be appreciated that in some of the embodiments described above, reference is made to "generating", such as generating a second sequence based on a first sequence. "generate" may also be replaced by: "get", or "determine", or "get", etc.

It should also be understood that the formulas involved in the various embodiments of the present application are illustrative and are not intended to limit the scope of the embodiments of the present application. In the process of calculating the above-mentioned parameters, the calculation may be performed according to the above-mentioned formula, or based on the deformation of the above-mentioned formula, or the calculation may be performed according to a formula determined by the method provided by the embodiment of the present application, or may be performed according to another manner to satisfy the result of the formula calculation.

It should also be appreciated that in some of the embodiments described above, reference is made to "predefined", which may be understood as defined in the standard.

It will be further understood that, in the embodiments of the present application, the transmitting end refers to a device that transmits a signal (e.g., transmits a PPDU), and the receiving end refers to a device that receives a signal (e.g., receives a PPDU), and the number of transmitting ends and receiving ends is not limited in the embodiments of the present application. For example, the transmitting end and the receiving end are both one, for example, one transmitting end transmits a first PPDU and a second PPDU, and one receiving end receives the first PPDU and the second PPDU. For another example, there are one transmitting end and two receiving ends, for example, one transmitting end transmits the first PPDU and the second PPDU, one receiving end receives the first PPDU, and the other receiving end receives the second PPDU.

It will also be appreciated that some optional features of the various embodiments of the application may, in some circumstances, be independent of other features or may, in some circumstances, be combined with other features, without limitation.

It is also to be understood that the aspects of the embodiments of the application may be used in any reasonable combination, and that the explanation or illustration of the various terms presented in the embodiments may be referred to or explained in the various embodiments without limitation.

It should also be understood that, in the foregoing embodiments of the methods and operations implemented by the transmitting device, the methods and operations may also be implemented by a component (such as a chip or a circuit) of the transmitting device; in addition, the methods and operations implemented by the receiving-end device may also be implemented by component parts (e.g., chips or circuits) of the receiving-end device, without limitation.

Corresponding to the methods given by the above method embodiments, the embodiments of the present application also provide corresponding apparatuses, where the apparatuses include corresponding modules for executing the above method embodiments. The module may be software, hardware, or a combination of software and hardware. It will be appreciated that the technical features described in the method embodiments described above are equally applicable to the device embodiments described below.

Fig. 5 is a schematic diagram of an apparatus 500 for transmitting a physical layer protocol data unit according to an embodiment of the present application. The apparatus 500 comprises 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 referred to as a communication interface or a communication unit. The processing unit 520 may be configured to implement a corresponding processing function, such as performing correlation detection, and generating a PPDU, for example.

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

In the first design, the apparatus 500 may be the transmitting end in the foregoing embodiment, or may be a component (such as a chip) of the transmitting end. The apparatus 500 may implement steps or processes corresponding to those performed by the transmitting end in the above method embodiment, where the transceiver unit 510 may be configured to perform operations related to the transceiver of the transmitting end in the above method embodiment, and the processing unit 520 may be configured to perform operations related to the processing of the transmitting end in the above method embodiment.

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

In a second design, the device 500 may be the receiving end in the foregoing embodiment, or may be a component (e.g., a chip) of the receiving end. The apparatus 500 may implement steps or processes corresponding to those performed by the receiving end in the above method embodiment, where the transceiver unit 510 may be configured to perform operations related to the transceiver of the receiving end in the above method embodiment, and the processing unit 520 may be configured to perform operations related to the processing of the receiving end in the above method embodiment.

In one possible implementation manner, the transceiver unit 510 is configured to receive a second physical layer protocol data unit PPDU, where the second PPDU includes a second synchronization header field; the processing unit 520 is configured to perform correlation detection according to the second sequence and the second synchronization header field, where 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 a sequence corresponding to the first synchronization header field of the first PPDU.

Optionally, the transceiver unit 510 is further configured to receive a first PPDU, where the first PPDU includes a 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 designs described above, the second sequence is illustratively derived by stretching and sampling the first sequence.

In any of the above designs, the first sequence is illustrativelyAnd->The second sequence isAnd->The first sequence and the second sequence satisfy the following formula:

wherein i= [0, t ].

In either of the designs described above, the side lobes of the periodic autocorrelation functions of the first and second sequences are illustratively identical.

In any of the designs described above, 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 illustratively constant values.

In any of the above designs, the first sync header field illustratively includes a sync field generated from a base symbol and a frame start delimiter field generated from a base symbol and a preset sequence, the base symbol generated from the first sequence.

In any of the designs described above, the first sequence is illustratively a binary sequence consisting of 0 and 1, or the first sequence is a binary sequence consisting of 1 and-1, or the first sequence is a binary sequence consisting of 0, 1, and-1.

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

It should also be appreciated that the apparatus 500 herein is embodied in the form of functional units. The term "unit" herein may refer to an application specific integrated circuit (application specific integrated circuit, ASIC), an electronic circuit, a processor (e.g., a shared, dedicated, or group processor, etc.) and memory that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that support the described functionality. In an alternative example, it will be understood by those skilled in the art that the apparatus 500 may be specifically configured as the transmitting end in the foregoing embodiments, and may be configured to perform each flow and/or step corresponding to the transmitting end in the foregoing method embodiments; alternatively, the apparatus 500 may be specifically configured as the receiving end in the foregoing embodiments, and may be configured to execute each flow and/or step corresponding to the receiving end in the foregoing method embodiments, which are not repeated herein. The transceiver unit 510 may also be a transceiver circuit (for example, may include a receiving circuit and a transmitting circuit), and the processing unit may be a processing circuit. The apparatus in fig. 5 may be the device in the foregoing embodiment, or may be a chip or a chip system, for example: system on chip (SoC). The receiving and transmitting unit can be an input and output circuit and a communication interface; the processing unit is an integrated processor or microprocessor or integrated circuit on the chip. And are not limited herein.

The apparatus 500 of each of the above embodiments has a function of implementing the corresponding steps performed by the transmitting end or the receiving end in the above method. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software comprises one or more modules corresponding to the functions; for example, the transceiver unit may be replaced by a transceiver (e.g., a transmitting unit in the transceiver unit may be replaced by a transmitter, a receiving unit in the transceiver unit may be replaced by a receiver), and other units, such as a processing unit, etc., may be replaced by a processor, to perform the transceiver operations and related processing operations in the various method embodiments, respectively.

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 apparatus 600 includes a processor 610, the processor 610 being configured to execute computer programs or instructions stored in a memory 620 or to read data/signaling stored in the memory 620 to perform the methods in the method embodiments above. Optionally, the processor 610 is one or more.

Optionally, as shown in fig. 6, the apparatus 600 further comprises a memory 620, the memory 620 being for storing computer programs or instructions and/or data. The memory 620 may be integrated with the processor 610 or may be provided separately. Optionally, the memory 620 is one or more.

Optionally, as shown in fig. 6, the apparatus 600 further comprises a transceiver 630, the transceiver 630 being used for receiving and/or transmitting signals. For example, the processor 610 is configured to control the transceiver 630 to receive and/or transmit signals.

As an aspect, the apparatus 600 is configured to implement the operations performed by the transmitting end in the above method embodiments.

For example, the processor 610 is configured to execute a computer program or instructions stored in the memory 620 to implement the relevant operations on the transmitting end in the above method embodiments. For example, the method performed by the sender in the embodiment shown in fig. 4.

Alternatively, the apparatus 600 is configured to implement the operations performed by the receiving end in the above method embodiments.

For example, the processor 610 is configured to execute a computer program or instructions stored in the memory 620 to implement the relevant operations on the receiving end in the above method embodiments. For example, the method performed by the receiving end in the embodiment shown in fig. 4.

It should be appreciated that the processors referred to in embodiments of the present application may be central processing units (central processing unit, CPU), but 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 arrays (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. 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 referred to in embodiments of the present application may be volatile memory and/or nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM). For example, RAM may be used as an external cache. By way of example, and not limitation, RAM includes the following forms: static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct memory bus RAM (DR RAM).

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

It should also be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

Fig. 7 is a schematic diagram of a chip system 700 according to an embodiment of the present application. The system-on-chip 700 (or may also be referred to as a processing system) includes logic 710 and input/output interface 720.

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

Specifically, for example, if the transmitting end installs the chip system 700, the logic circuit 710 is coupled to the input/output interface 720, and the logic circuit 710 may transmit a PPDU (e.g., a first PPDU, also referred to as a second PPDU) through the input/output interface 720, where the PPDU (e.g., the first PPDU, also referred to as the second PPDU) may be generated for the logic circuit 710. For another example, if the receiving end installs the chip system 700, the logic circuit 710 is coupled to the input/output interface 720, and the logic circuit 710 may receive a PPDU (e.g., a first PPDU, e.g., a second PPDU) through the input/output interface 720, and the logic circuit 710 parses the PPDU (e.g., the first PPDU, e.g., the second PPDU).

As an aspect, the chip system 700 is configured to implement the operations performed by the transmitting end in the above method embodiments.

For example, the logic circuit 710 is configured to implement the operations related to the processing performed by the sender in the above method embodiment, for example, the operations related to the processing performed by the sender in the embodiment shown in fig. 4; the input/output interface 720 is used to implement the operations related to transmission and/or reception performed by the transmitting end in the above method embodiment, for example, the operations related to transmission and/or reception performed by the transmitting end in the embodiment shown in fig. 4.

Alternatively, the chip system 700 is configured to implement the operations performed by the receiving end in the above method embodiments.

For example, the logic circuit 710 is configured to implement the operations related to the processing performed by the receiving end in the above method embodiment, for example, the operations related to the processing performed by the receiving end in the embodiment shown in fig. 4; the input/output interface 720 is used to implement the operations related to transmission and/or reception performed by the receiving end in the above method embodiment, for example, the operations related to transmission and/or reception performed by the receiving end in the embodiment shown in fig. 4.

The embodiments of the present application also provide a computer readable storage medium having stored thereon computer instructions for implementing the method performed by the apparatus in the method embodiments described above.

For example, the computer program when executed by a computer, enables the computer to implement the method executed by the transmitting end in the above-described method embodiments.

As another example, the computer program when executed by a computer may enable the computer to implement the method performed by the receiving end in the embodiments of the method described above.

Embodiments of the present application also provide a computer program product containing instructions that, when executed by a computer, implement a method performed by an apparatus (e.g., a transmitting end, and a receiving end) in the above method embodiments.

The embodiment of the application also provides a communication system which comprises the sending end and the receiving end.

The explanation and beneficial effects of the related content in any of the above-mentioned devices can refer to the corresponding method embodiments provided above, and are not repeated here.

In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Furthermore, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, 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 loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. For example, the computer may be a personal computer, a server, or a network device, etc. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)), or wireless (e.g., 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, data center, etc. that contains an integration of one or more available media. For example, the aforementioned usable media include, but are not limited to, U disk, removable hard disk, read-only memory (ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other various media that can store program code.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (14)

1. A method for transmitting a physical layer protocol data unit, comprising:

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

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

and transmitting a first physical layer protocol data unit (PPDU) and a second PPDU, wherein the first PPDU comprises the first synchronous header field, and the second PPDU comprises the second synchronous header field.

2. A method for transmitting a physical layer protocol data unit, comprising:

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

and performing correlation detection according to a second sequence and the second synchronous header field, wherein 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 a sequence corresponding to the first synchronous header field of the first PPDU.

3. The method according to claim 1 or 2, characterized in that the method further comprises:

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

and performing correlation detection according to the first sequence and the first synchronous header field.

4. A method according to any one of claim 1 to 3, wherein,

the second sequence is obtained by performing extension and sampling processing on the first sequence.

5. The method according to any one of claim 1 to 4, wherein,

the first sequence isAnd->The second sequence is->And->The first sequence and the second sequence satisfy the following formula:

wherein i= [0, t ].

6. The method according to any one of claim 1 to 5, wherein,

the side lobes of the periodic autocorrelation functions of the first sequence and the second sequence are identical.

7. The method according to any one of claim 1 to 6, wherein,

the side lobe of the periodic autocorrelation function of the first sequence and/or the side lobe of the periodic autocorrelation function of the second sequence are constant values.

8. The method according to any one of claims 1 to 7, wherein,

The first synchronization header field comprises a synchronization field and a frame start separator field, the synchronization field is generated according to a basic symbol, the frame start separator field is generated according to the basic symbol and a preset sequence, and the basic symbol is generated according to the first sequence.

9. The method according to any one of claims 1 to 8, wherein,

the first sequence is a binary sequence consisting of 0 and 1, or the first sequence is a binary sequence consisting of 1 and-1, or the first sequence is a binary sequence consisting of 0, 1 and-1.

10. An apparatus for transmitting physical layer protocol data units, the apparatus comprising: unit for performing the method according to any of claims 1 to 9.

11. An apparatus for transmitting physical layer protocol data units, comprising:

a processor for executing computer instructions stored in a memory to cause the apparatus to perform: the method of any one of claims 1 to 9.

12. The apparatus of claim 11, further comprising the memory.

13. The apparatus of claim 11 or 12, further comprising a communication interface coupled to the processor,

The communication interface is used for inputting and/or outputting information.

14. A computer readable storage medium storing a computer program comprising instructions for implementing the method of any one of claims 1 to 9.