Communication method and communication apparatus

Abstract

The present application provides a communication method, comprising: generating and sending first symbols, wherein a plurality of first subcarriers corresponding to the first symbols are respectively used for bearing a plurality of first pilots; a plurality of second subcarriers corresponding to the first symbols are used for bearing some or all of frequency-domain signals; a Pth subcarrier block and a (P+1)th subcarrier block are spaced apart by (m-1) second subcarriers; each subcarrier block comprises at least one first subcarrier; and the frequency-domain signals are obtained by means of DFT of data signals. By means of frequency-division sending of pilots and data in a frequency domain, the data is prevented from interfering with the pilots, thereby improving the accuracy of channel estimation. In addition, the frequency-domain signals are obtained by means of performing DFT on the data signals, thereby retaining the performance of a relatively low PAPR of a single carrier.

Description

Communication method and communication apparatus

[0001] This application claims priority to the Chinese patent application No. 202410425607.8, filed on April 9, 2024, and entitled "Communication method and communication apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of communication, and more particularly, to a communication method and a communication apparatus. BACKGROUND

[0003] Single carrier has the advantage of lower peak to average power ratio (PAPR) compared to multi-carrier (such as orthogonal frequency division multiplexing (OFDM)). However, how to send the pilot of single carrier has been a widely studied problem in the industry.

[0004] OFDM pilots can be sent on subcarriers in the frequency domain, and OFDM pilots and data subcarriers are orthogonal and have no interference. The receiver can estimate the channel corresponding to each pilot subcarrier through the pilot, then obtain the channel of all subcarriers, and then equalize and demodulate the data carried on other data subcarriers. However, if the single carrier (such as discrete Fourier transform spreading OFDM (DFT-s-OFDM)) pilot is sent in the same way as the OFDM pilot, the PAPR will be increased, reducing the advantage of single carrier over OFDM.

[0005] A method for sending a pilot in a single carrier system is to time-division the pilot and the data signal in the time domain, which is equivalent to performing discrete Fourier transform (DFT) on the pilot and the data together. However, in this method, the data signal may interfere with the pilot, thereby affecting the accuracy of channel estimation. Therefore, how to improve the performance of pilot transmission in a single carrier system has become a problem to be solved. SUMMARY

[0006] The present application provides a communication method to reduce the interference of data on the pilot while maintaining the advantage of single carrier PAPR.

[0007] In a first aspect, a communication method is provided. The method can be performed by a first communication device. In the absence of specific statements, the "first communication device" in the present application can refer to the first communication device itself (for example, a network device, a terminal device), a component (for example, a processor, a chip, or a chip system) in the first communication device, or a logic module or software capable of realizing all or part of the functions of the first communication device. For ease of description, the following description takes the first communication device as an example.

[0008] The communication method includes: generating a first symbol, the first symbol corresponding to a plurality of first subcarriers respectively used to carry a plurality of first pilots, and the first symbol corresponding to a plurality of second subcarriers used to carry part or all of a frequency domain signal; and transmitting the first symbol, wherein the Pth subcarrier block and the P+1th subcarrier block are separated by m-1 second subcarriers, each of the subcarrier blocks includes at least one first subcarrier, m is an integer greater than or equal to 2, the frequency domain signal is obtained by performing discrete Fourier transform (DFT) on a data signal, and P is a positive integer.

[0009] Optionally, the first symbol described above can be a DFT-s-OFDM symbol. Alternatively, the first symbol can be other symbols with low PAPR characteristics of single carrier, which are not limited in the present application.

[0010] Based on the above technical solution, in the process of generating the first symbol, the first communication device can map the pilots on the plurality of first subcarriers, and map the frequency domain signal obtained by performing DFT on the data signal on the plurality of second subcarriers. Specifically, at least one second subcarrier is arranged between a subcarrier block and a next subcarrier block, that is, the pilots and the data are frequency division transmitted in the frequency domain, which avoids the interference of the data on the pilots and improves the accuracy of channel estimation. In addition, the frequency domain signal is obtained by performing DFT on the data signal, which retains the performance of low PAPR of single carrier.

[0011] In combination with the first aspect, in some implementations of the first aspect, if the number of the plurality of second subcarriers is N1, the generating the first symbol includes: generating N1 data signals, and performing N1-point DFT on the N1 data signals to obtain N1 frequency domain signals; and mapping the N1 frequency domain signals on the N1 second subcarriers respectively, wherein N1 is a positive integer.

[0012] Based on the above technical solution, in the case that the number of the second subcarriers is N1, the first communication device can generate data signals based on the number of subcarriers capable of carrying frequency domain signals, and perform DFT on the data signals to obtain frequency domain signals. For example, if the number of the second subcarriers is N1, the network device can generate N1 data signals. Thus, it can be ensured that the data signals obtained by DFT transformation can be mapped on the data subcarriers, thereby improving the performance of data signal transmission.

[0013] In combination with the first aspect, in some implementations of the first aspect, the generating the first symbol includes: performing DFT transformation on the N2 data signals to obtain N2 frequency domain signals; and mapping the N2 frequency domain signals on N2 third subcarriers, the N2 third subcarriers being part of or all of the plurality of second subcarriers and the Pth third subcarrier and the P+1th third subcarrier being spaced by P1 subcarriers, wherein N2, P, and P1 are positive integers.

[0014] Based on the above technical solution, if the number of data subcarriers corresponding to the first symbol is relatively large and capable of carrying more frequency domain signals, part or all of the data subcarriers can be used to carry the frequency domain signals, thereby avoiding data signal loss and ensuring data transmission performance.

[0015] In combination with the first aspect, in some implementations of the first aspect, if the number of the plurality of second subcarriers is N1 and the number of the plurality of first subcarriers is M, the generating the first symbol includes: generating N1+M data signals and performing N1+M-point DFT transformation on the N1+M data signals to obtain N1+M frequency domain signals; if a first frequency domain signal corresponds to the first subcarrier, the first frequency domain signal is not mapped; or if the first frequency domain signal corresponds to the second subcarrier, the first frequency domain signal is mapped, wherein N1 and M are positive integers, and the first frequency domain signal is any one of the N1+M frequency domain signals.

[0016] Based on the above technical solution, in the process of mapping the frequency domain signals to the subcarriers, no mapping is performed on the pilot subcarriers, thereby possibly causing loss of part of the frequency domain signals. For a low code rate scenario (for example, in the case that m is greater than a certain threshold), part of the signals is allowed to be lost, and the data transmission overhead can be reduced without affecting data analysis.

[0017] In combination with the first aspect, in some implementations of the first aspect, the method further includes: sending first indication information, the first indication information being used to indicate a pattern of the plurality of first subcarriers.

[0018] Based on the technical solution, the first communication device can indicate the pattern of the first subcarriers to the second communication device through the first indication information, so that the first communication device and the second communication device reach a consensus on the positions of the subcarriers capable of carrying pilots, and support the second communication device to correctly parse the received first symbol.

[0019] With reference to the first aspect, in some implementations of the first aspect, the first indication information is used to indicate the position of the first first subcarrier in the frequency domain resource (such as a resource block (RB)) and at least one of the following information: the number of the first subcarriers included in the subcarrier block, 1 / m, m, or m-1.

[0020] Based on the technical solution, the first indication information can achieve the purpose of indicating the pattern of the first subcarriers by indicating different information, thereby improving the flexibility of the scheme.

[0021] With reference to the first aspect, in some implementations of the first aspect, the position of the first first subcarrier in the frequency domain resource is associated with at least one of the following parameters: an identifier of a terminal device, an identifier of a cell, an index of the first symbol, an index of a slot, an index of a subframe, an index of a frame, or an identifier of a partial bandwidth BWP.

[0022] With reference to the first aspect, in some implementations of the first aspect, a first carrier set in the plurality of first subcarriers corresponds to a first antenna port, and a second carrier set in the plurality of first subcarriers corresponds to a second antenna port, wherein the first carrier set includes at least one of the first subcarriers, the second carrier set includes at least one of the first subcarriers, and there is no intersection between the first carrier set and the second carrier set.

[0023] Based on the technical solution, the pilots corresponding to different antenna ports occupy different frequency domain resources (such as different first subcarriers), so that different antenna ports are orthogonally distributed on a plurality of pilot subcarriers in a frequency division manner, thereby avoiding mutual interference.

[0024] With reference to the first aspect, in some implementations of the first aspect, the Pth first subcarrier in the first carrier set and the P+1th first subcarrier are spaced apart by P2 subcarriers, and the Pth first subcarrier in the second carrier set and the P+1th first subcarrier are spaced apart by P3 subcarriers, wherein P, P2, and P3 are positive integers.

[0025] Based on the above technical solution, different antenna ports occupy different subcarriers, and different antenna ports can be uniformly distributed on the frequency resource, which makes different antenna ports orthogonally distributed on multiple pilot subcarriers in a frequency division manner while maintaining the single carrier PAPR advantage.

[0026] In combination with the first aspect, in some implementations of the first aspect, the multiple first subcarriers constitute a first code division multiplexing (CDM) block, and the multiple first subcarriers correspond to multiple antenna ports.

[0027] Based on the above technical solution, the pilots corresponding to different antenna ports occupy the same time-frequency resource and are distinguished by different code domain resources, so that different antenna ports are orthogonally distributed on multiple pilot subcarriers in a code division manner, avoiding mutual interference.

[0028] In combination with the first aspect, in some implementations of the first aspect, a first carrier set in the multiple first subcarriers constitutes a first code division multiplexing (CDM) block, and a second carrier set in the multiple first subcarriers constitutes a second CDM block, wherein the first CDM block corresponds to multiple first antenna ports, the second CDM block corresponds to multiple second antenna ports, the first carrier set includes at least one first subcarrier, the second carrier set includes at least one first subcarrier, and the first carrier set and the second carrier set have no intersection.

[0029] Based on the above technical solution, the pilots corresponding to different antenna ports occupy the same time-frequency resource and are distinguished by different code domain resources, and the pilots corresponding to different antenna ports in different CDM blocks occupy different frequency domain resources (such as different first subcarriers), so that different antenna ports are orthogonally distributed on multiple pilot subcarriers in a frequency division and code division manner, avoiding mutual interference.

[0030] In combination with the first aspect, in some implementations of the first aspect, the method further includes: sending second indication information, the second indication information indicating one of multiple pilot patterns, and in each pilot pattern, the multiple first subcarriers correspond to corresponding antenna ports.

[0031] Based on the above technical solution, the pilot pattern can be used to indicate the corresponding antenna ports of the multiple first subcarriers, reducing the indication overhead.

[0032] In some implementations of the first aspect, the method further includes: transmitting a second symbol, a plurality of fourth subcarriers of the second symbol being used to carry a plurality of second pilots respectively, and a plurality of fifth subcarriers of the second symbol being used to carry part or all of a frequency domain signal; wherein a Pth fourth subcarrier block and a P+1th fourth subcarrier block are separated by m-1 fifth subcarriers, each of the subcarrier blocks includes at least one fourth subcarrier, m is an integer greater than or equal to 2, the frequency domain signal is obtained by DFT transformation of a data signal, and P is a positive integer.

[0033] Based on the above technical solutions, the second symbol can be transmitted on the premise that the first symbol is transmitted, and in the case of multiple symbols, time division can be implemented, that is, RSs corresponding to different antenna ports occupy different time domain resources, thereby avoiding mutual interference.

[0034] In some implementations of the first aspect, at least one of the first subcarriers and at least one of the fourth subcarriers constitute a third code division multiplexing (CDM) block.

[0035] Based on the above technical solutions, the pilots corresponding to the antenna ports of the first symbol and the pilots corresponding to the antenna ports of the second symbol occupy different time-frequency resources and are distinguished by different code domain resources, so that different antenna ports are orthogonally distributed on the multiple pilot subcarriers in a time division and code division manner, thereby avoiding mutual interference.

[0036] In some implementations of the first aspect, the method further includes: transmitting third indication information, the third indication information being used to indicate a pilot pattern on multiple symbols.

[0037] Based on the above technical solutions, the first communication device can indicate the pattern of the pilot subcarriers corresponding to the multiple symbols to the second communication device through the third indication information, so that the first communication device and the second communication device reach a consensus on the positions of the subcarriers that can carry the pilots, thereby supporting the second communication device to correctly parse the received multiple symbols.

[0038] In some implementations of the first aspect, the third indication information is used to indicate the position of a first one of the first subcarriers on a resource block frequency domain resource, and / or the position of a first one of the fourth subcarriers on a frequency domain resource (such as an RB), and at least one of the following information: 1 / m, a / m, or a, wherein a indicates the number of symbols used to carry the pilots, 1 / m indicates the density of the pilots carried on each symbol, and a / m indicates the density of the pilots carried on a symbol.

[0039] Based on the technical scheme, the first indication information can indicate the patterns of the pilot subcarriers corresponding to the plurality of symbols by indicating different information, thereby improving the flexibility of the scheme.

[0040] In a second aspect, a communication method is provided. The method can be performed by a second communication device. In the absence of special description, the "second communication device" in the present application can refer to the second communication device itself (for example, a network device or a terminal device), a component (for example, a processor, a chip, or a chip system) in the second communication device, or a logic module or software capable of realizing all or part of the functions of the second communication device. For ease of description, the following description takes the second communication device as an example.

[0041] The communication method includes: receiving a first symbol, a plurality of first subcarriers corresponding to the first symbol are used to carry a plurality of first pilots, and a plurality of second subcarriers corresponding to the first symbol are used to carry part or all of a frequency domain signal; and analyzing the first symbol, wherein a Pth subcarrier block and a P+1th subcarrier block are separated by m-1 second subcarriers, each of the subcarrier blocks includes at least one first subcarrier, m is an integer greater than or equal to 2, the frequency domain signal is obtained by performing discrete Fourier transform (DFT) on a data signal, and P is a positive integer.

[0042] With reference to the second aspect, in some implementations of the second aspect, N1 frequency domain signals are carried on N1 second subcarriers of the first symbol, and the analyzing the first symbol includes: performing N1-point inverse fast Fourier transform (IFFT) on the N1 frequency domain signals to obtain N1 data signals, where N1 is a positive integer.

[0043] With reference to the second aspect, in some implementations of the second aspect, N2 frequency domain signals are carried on N2 third subcarriers of the first symbol, and the analyzing the first symbol includes: performing inverse fast Fourier transform (IFFT) on N2 frequency domain signal groups to obtain N2 data signals, the N2 third subcarriers are part or all of the plurality of second subcarriers, and a Pth third subcarrier and a P+1th third subcarrier are separated by P1 subcarriers, where N2, P, and P1 are positive integers.

[0044] With reference to the second aspect, in some implementations of the second aspect, the method further includes: receiving first indication information, the first indication information being used to indicate a pattern of the plurality of first subcarriers.

[0045] In some implementations of the second aspect, in combination with the second aspect, the first indication information is used to indicate a location of a first first subcarrier in the frequency domain resource and at least one of the following: a number of the first subcarriers included in the subcarrier block, 1 / m, m, or m-1.

[0046] In some implementations of the second aspect, in combination with the second aspect, the location of the first first subcarrier in the frequency domain resource is associated with at least one of the following: an identifier of a terminal device, an identifier of a cell, an index of the first symbol, an index of a slot, an index of a subframe, an index of a frame, or an identifier of a partial bandwidth BWP.

[0047] In some implementations of the second aspect, in combination with the second aspect, a first set of carriers in the plurality of first subcarriers corresponds to a first antenna port, and a second set of carriers in the plurality of first subcarriers corresponds to a second antenna port,

[0048] wherein the first set of carriers includes at least one of the first subcarriers, the second set of carriers includes at least one of the first subcarriers, and the first set of carriers and the second set of carriers have no intersection.

[0049] In some implementations of the second aspect, in combination with the second aspect, a Pth first subcarrier and a (P+1)th first subcarrier in the first set of carriers are spaced apart by P2 subcarriers, and a Pth first subcarrier and a (P+1)th first subcarrier in the second set of carriers are spaced apart by P3 subcarriers, where P, P2, and P3 are positive integers.

[0050] In some implementations of the second aspect, in combination with the second aspect, the plurality of first subcarriers form a first code division multiplexing (CDM) block, and the plurality of first subcarriers jointly correspond to a plurality of antenna ports.

[0051] In some implementations of the second aspect, in combination with the second aspect, a first set of carriers in the plurality of first subcarriers forms a first code division multiplexing (CDM) block, and a second set of carriers in the plurality of first subcarriers forms a second CDM block,

[0052] wherein the first CDM block corresponds to a plurality of first antenna ports, the second CDM block corresponds to a plurality of second antenna ports, the first set of carriers includes at least one of the first subcarriers, the second set of carriers includes at least one of the first subcarriers, and the first set of carriers and the second set of carriers have no intersection.

[0053] With reference to the second aspect, in some implementations of the second aspect, the method further includes receiving second indication information, the second indication information indicating one of a plurality of pilot patterns, each of the pilot patterns having the plurality of first subcarriers corresponding to a respective antenna port.

[0054] With reference to the second aspect, in some implementations of the second aspect, the method further includes receiving a second symbol, a plurality of fourth subcarriers of the second symbol being used to carry a plurality of second pilots respectively, and a plurality of fifth subcarriers of the second symbol being used to carry part or all of a frequency domain signal; wherein a Pth fourth subcarrier block and a P+1th fourth subcarrier block are separated by m-1 fifth subcarriers, each of the fourth subcarrier blocks includes at least one fourth subcarrier, m is an integer greater than or equal to 2, the frequency domain signal is obtained by DFT transforming a data signal, and P is a positive integer.

[0055] With reference to the second aspect, in some implementations of the second aspect, at least one of the first subcarriers and at least one of the fourth subcarriers form a third code division multiplexing (CDM) block.

[0056] With reference to the second aspect, in some implementations of the second aspect

[0057] With reference to the second aspect, in some implementations of the second aspect, the method further includes receiving third indication information, the third indication information being used to indicate a pilot pattern on a plurality of symbols.

[0058] With reference to the second aspect, in some implementations of the second aspect, the third indication information is used to indicate a position of a first one of the first subcarriers in a frequency domain resource, and / or a position of a first one of the fourth subcarriers in the frequency domain resource, and at least one of 1 / m, a / m, or a, wherein a indicates a number of symbols used to carry pilots, 1 / m indicates a density of pilots carried on each symbol, and a / m indicates a density of pilots carried on a symbol.

[0059] With reference to the second aspect, in some implementations of the second aspect, the method further includes obtaining fourth indication information, the fourth indication information being used to indicate at least one of the following: the first symbol supports transmitting N3 first pilots on N3 first subcarriers of the plurality of first subcarriers, the N3 first subcarriers being part of the plurality of first subcarriers; or the first symbol supports equally spacing the plurality of first pilots in a frequency domain; or if m0 is less than a first threshold, 1 / m is greater than or equal to 1 / m0; or if m0 is greater than a second threshold, 1 / m is greater than or equal to 1 / m0.

[0060] The technical effects of the method shown in the second aspect and possible designs thereof can refer to the technical effects in the first aspect and possible designs thereof.

[0061] In a third aspect, a communication apparatus is provided. The communication apparatus is configured to perform the method in the first aspect and any of the possible implementations of the first aspect. Specifically, the communication apparatus includes a processor and a memory storing a computer program. The processor is configured to invoke and run the computer program from the memory, so that the communication apparatus performs the method in the first aspect and any of the possible implementations of the first aspect.

[0062] In an implementation form, the communication apparatus is a network device. When the communication apparatus is a network device, the transceiver unit can be a transceiver, or the input / output interface. The processing unit can be at least one processor. Optionally, the transceiver can be a transceiver circuit. Optionally, the input / output interface can be an input / output circuit.

[0063] In another implementation form, the communication apparatus can be a chip, a chip system or a circuit in the network device. In this case, the transceiver unit can be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin or related circuit on the chip, the chip system or the circuit; and the processing unit can be at least one processor, a processing circuit or a logic circuit.

[0064] In a fourth aspect, a communication apparatus is provided. The communication apparatus is configured to perform the method in the second aspect and any of the possible implementations of the second aspect. Specifically, the communication apparatus includes a processor and a memory storing a computer program. The processor is configured to invoke and run the computer program from the memory, so that the network device performs the method in the second aspect and any of the possible implementations of the second aspect.

[0065] In an implementation form, the communication apparatus is a terminal device. When the communication apparatus is a terminal device, the transceiver unit can be a transceiver, or the input / output interface. The processing unit can be at least one processor. Optionally, the transceiver can be a transceiver circuit. Optionally, the input / output interface can be an input / output circuit.

[0066] In another implementation form, the communication apparatus can be a chip, a chip system or a circuit in the terminal device. In this case, the transceiver unit can be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin or related circuit on the chip, the chip system or the circuit; and the processing unit can be at least one processor, a processing circuit or a logic circuit.

[0067] In a fifth aspect, a computer readable storage medium is provided. The computer readable storage medium stores a computer program which, when executed, causes the method in any of the possible implementations of the first aspect and the second aspect to be performed.

[0068] In a sixth aspect, a computer program product is provided. The computer program product, when executed, causes any of the methods provided by the first aspect and the second aspect to be performed.

[0069] In a seventh aspect, a chip is provided. The chip includes a processor and a communication interface. The processor reads instructions through the communication interface and executes any of the methods provided by the first aspect and the second aspect.

[0070] Optionally, as an implementation form, the chip further includes a memory. The memory stores a computer program or instructions. The processor is configured to execute the computer program or instructions stored in the memory. When the computer program or instructions are executed, the processor is configured to execute any of the methods provided by the first aspect and the second aspect.

[0071] In an eighth aspect, a communication system is provided. The communication system includes the communication device of the third aspect and the communication device of the fourth aspect.

[0072] In a ninth aspect, a computer program is provided. The computer program, when executed, causes any of the methods provided by the first aspect and the second aspect to be performed. BRIEF DESCRIPTION OF DRAWINGS

[0073] FIG. 1 is a schematic diagram of a communication system suitable for use with the present application.

[0074] FIG. 2 is a schematic diagram of transmitting DFT-s-OFDM.

[0075] FIG. 3 is a schematic diagram of transmitting DMRS and data signals.

[0076] FIG. 4 is a schematic flowchart of a communication method provided by an embodiment of the present application.

[0077] FIG. 5(a) to (d) are schematic diagrams of a pilot subcarrier distribution provided by an embodiment of the present application.

[0078] FIG. 6(a) and (b) are schematic diagrams of another pilot subcarrier distribution provided by an embodiment of the present application.

[0079] FIG. 7 is a schematic diagram of yet another pilot subcarrier distribution provided by an embodiment of the present application.

[0080] FIG. 8 is a schematic diagram of yet another pilot subcarrier distribution provided by an embodiment of the present application.

[0081] FIG. 9(a) and (b) are schematic diagrams of a pilot pattern provided by an embodiment of the present application.

[0082] FIG. 10(a)-(c) are schematic diagrams of another pilot subcarrier distribution according to an embodiment of the present application.

[0083] FIG. 11 is a schematic diagram of another pilot subcarrier distribution according to an embodiment of the present application.

[0084] FIG. 12 is a schematic diagram of another pilot subcarrier distribution according to an embodiment of the present application.

[0085] FIG. 13 is a schematic flowchart of a communication method according to an embodiment of the present application.

[0086] FIG. 14 is a schematic block diagram of a communication apparatus according to an embodiment of the present application.

[0087] FIG. 15 is a schematic diagram of another communication apparatus according to an embodiment of the present application.

[0088] FIG. 16 is a schematic diagram of a chip system according to an embodiment of the present application. DETAILED DESCRIPTION

[0089] In order to facilitate understanding of the embodiments of the present application, the following points are first explained.

[0090] First, in the present application, "for indicating" can include for directly indicating and for indirectly indicating. When describing that certain indication information is for indicating A, it can include that the indication information directly indicates A or indirectly indicates A, and does not mean that A must be carried in the indication information.

[0091] The information indicated by the indication information is referred to as to-be-indicated information. In the implementation process, there are many ways to indicate the to-be-indicated information, for example, but not limited to, the to-be-indicated information can be directly indicated, such as the to-be-indicated information itself or an index of the to-be-indicated information. The to-be-indicated information can also be indirectly indicated by indicating other information, where the other information and the to-be-indicated information have an association relationship. The to-be-indicated information can also be only indicated in part, and the other part of the to-be-indicated information is known or agreed in advance. For example, the indication of a specific information can also be achieved by means of the arrangement order of each information agreed in advance (for example, a protocol stipulates), thereby reducing the indication overhead to a certain extent. Meanwhile, the common part of each information can be identified and uniformly indicated, so as to reduce the indication overhead caused by separately indicating the same information.

[0092] Second, "at least one" in the present application means one or more, and "more than one" means two or more (including two). In addition, in the embodiments of the present application, "first", "second", and various numerical numbers (for example, "#1", "#2", and the like) are only used for the convenience of description and do not limit the scope of the embodiments of the present application. The size of the serial number of each process below does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. It should be understood that the objects thus described can be interchanged under appropriate circumstances, so as to be able to describe solutions other than the embodiments of the present application. In addition, in the embodiments of the present application, "S410" and the like are only used for the convenience of description and do not limit the order of execution steps.

[0093] Third, in the embodiments of the present application, "exemplary" or "for example" and the like are used to represent an example, illustration or description. Any embodiment or design scheme described as "exemplary" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of "exemplary" or "for example" and the like is intended to present the relevant concept in a specific manner.

[0094] Fourth, in the embodiments of the present application, "saving" can mean saving in one or more memories. The one or more memories can be separately arranged or integrated in the encoder or decoder, processor, or communication device. The one or more memories can be partially separately arranged and partially integrated in the decoder, processor, or communication device. The type of memory can be any form of storage medium, which is not limited in the present application.

[0095] Fifth, in the embodiments of the present application, "protocol" can refer to a standard protocol in the communication field, which can include NR protocol and related protocols applied to future communication systems, which is not limited in the present application.

[0096] Sixth, in the embodiments of the present application, "of", "corresponding", "corresponding" and "associated" can be used interchangeably at times, and it should be pointed out that when the distinction is not emphasized, the meanings expressed are consistent.

[0097] Seventh, in the embodiments of the present application, "in the case of", "when", "if" can be used interchangeably at times, and it should be pointed out that when the distinction is not emphasized, the meanings expressed are consistent.

[0098] Eighth, the term "and / or" in this document is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent three cases of A alone, A and B together, and B alone. In addition, the character " / " in this document generally represents that the front and rear associated objects are in an "or" relationship.

[0099] Ninth, "message", "information", or "information element (IE)" and the like can be used interchangeably in this document, and the name of the message or information is not limited in any way as long as the corresponding function can be realized.

[0100] In this application, "sending" and "receiving" represent the direction of signal transmission. For example, "sending information to XX" can be understood as the destination of the information being XX, and "sending information" can include direct sending or indirect sending through other units or modules. "Receiving information from YY" can be understood as the source of the information being YY, and "receiving information" can include direct reception from YY or indirect reception from YY through other units or modules. In addition, "sending" can also be understood as the "output" of the chip interface, and "receiving" can also be understood as the "input" of the chip interface. In other words, "sending" or "receiving" can be carried out between devices, for example, between network devices and terminal devices through the air interface, and "sending" or "receiving" can also be carried out within the device, for example, between components, modules, chips, software modules or hardware modules within the device through the bus, wire or interface.

[0101] The technical solutions in this application will be described below with reference to the accompanying drawings.

[0102] The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD), a universal mobile communication system (UMTS), a worldwide interoperability for microwave access (WiMAX) communication system, a 5th generation (5G) system or new radio (NR), and future communication systems, vehicle-to-X (V2X), which can include vehicle to network (V2N), vehicle to vehicle (V2V), vehicle to infrastructure (V2I), vehicle to pedestrian (V2P), etc., LTE-V, Internet of Vehicles, machine type communication (MTC), Internet of Things (IoT), LTE-M, machine to machine (M2M), etc.

[0103] FIG. 1 is a schematic diagram of a communication system suitable for use with the present application. As shown in FIG. 1, the communication system 100 includes at least one network device, such as network device 111, network device 112, network device 113 shown in FIG. 1. The wireless communication system can also include at least one terminal device, such as terminal device 121, terminal device 122, terminal device 123, terminal device 124, terminal device 125, terminal device 126, terminal device 127 shown in FIG. 1.

[0104] Exemplarily, communications can be conducted between network devices and terminal devices, including but not limited to: multi-site transmission, enhanced mobile broadband (eMBB) transmission, etc., wherein network device 112 and network device 113 as shown in FIG. 1 can conduct multi-site transmission with terminal device 124, and network device 112 as shown in FIG. 1 can conduct eMBB transmission with terminal device 121, terminal device 122 and terminal device 123.

[0105] Exemplarily, communications can also be conducted between network devices, including but not limited to: backhaul, wherein network device 111 and network device 112 as shown in FIG. 1 can conduct communication through backhaul, and network device 111 and network device 113 can also conduct communication through backhaul, wherein network device 112 and network device 113 can play the role of relay nodes in the system.

[0106] Exemplarily, communications can also be conducted between terminal devices, including but not limited to: device-to-device (D2D) transmission, wherein terminal device 122 as shown in FIG. 1 can conduct communication with terminal device 125 through D2D transmission.

[0107] A network device is a network-side device with wireless transceiving function. The network device can be an apparatus in a radio access network (RAN) that provides wireless communication function for terminal devices. The network device can be a 3rd generation partnership project (3GPP)-related cellular system, such as a 5G mobile communication system, or a future-oriented evolved system (such as a 6G mobile communication system). The network device can also be an open radio access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (WiFi) system. For example, the network device can be a base station, an evolved NodeB (eNodeB), a next generation NodeB (gNB) in a 5G mobile communication system, a base station in a subsequent evolution of 3GPP, a transmission reception point (TRP), an access node in a WiFi system, a wireless relay node, a wireless backhaul node, etc. In a communication system employing different radio access technologies (RATs), the name of the device with base station function can be different. For example, in an LTE system, it can be referred to as an eNB or eNodeB, and in a 5G system or NR system, it can be referred to as a gNB. The specific name of the base station is not limited in the present application. The network device can contain one or more co-sited or non-co-sited transmission reception points. For another example, the network device can include at least one of the following: one or more central units (CUs), one or more distributed units (DUs), and one or more radio units (RUs).

[0108] In different systems, the CU (or CU-CP and CU-UP), DU or RU can also have different names, but those skilled in the art can understand their meanings. For example, in an open RAN (ORAN) system, the CU can also be referred to as an O-CU (open CU), the DU can also be referred to as an O-DU (open DU), the CU-CP can also be referred to as an O-CU-CP, the CU-UP can also be referred to as an O-CU-UP, and the RU can also be referred to as an O-RU. Any of the CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module. Exemplarily, the functions of the CU can be implemented by one entity or different entities. For example, the functions of the CU are further divided, i.e., the control plane and the user plane are separated and implemented by different entities, which are a control plane CU entity (i.e., a CU-CP entity) and a user plane CU entity (i.e., a CU-UP entity), respectively. The CU-CP entity and the CU-UP entity can be coupled with the DU to jointly complete the functions of the access network device. For example, the CU is responsible for processing non-real-time protocols and services, implementing radio resource control (RRC), and the functions of the packet data convergence protocol (PDCP) layer. The DU is responsible for processing physical layer protocols and real-time services, implementing the functions of the radio link control (RLC) layer, the media access control (MAC) layer and the physical (PHY) layer. In this way, part of the functions of the wireless access network device can be implemented by multiple network function entities. These network function entities can be network elements in a hardware device, or software functions running on a dedicated hardware, or virtualized functions instantiated on a platform (e.g., a cloud platform). The network device can also include an active antenna unit (AAU). The AAU implements part of the physical layer processing functions, radio frequency processing and related functions of the active antenna. Since the information of the RRC layer will eventually become the information of the PHY layer, or be converted from the information of the PHY layer, in this architecture, high-layer signaling, such as RRC layer signaling, can also be considered as being sent by the DU, or by the DU+AAU. It can be understood that the network device can be a device including one or more of the CU node, the DU node and the AAU node. In addition, the CU can be divided into a network device in a radio access network (RAN), or the CU can be divided into a network device in a core network (CN), which is not limited in this application.For another example, in vehicle to everything (V2X) technology, the access network device can be a road side unit (RSU). A plurality of access network devices in a communication system can be base stations of the same type or base stations of different types. A base station can communicate with a terminal device directly or through a relay station. In embodiments of the present application, the device for implementing the function of a network device can be the network device itself or a device capable of supporting the network device to implement the function, such as a chip system or a combination device or component capable of implementing the function of an access network device, which can be installed in the network device. In embodiments of the present application, the chip system can be composed of a chip or can include a chip and other discrete devices.

[0109] The terminal device is a user-side device with wireless transceiver function, which can be a fixed device, a mobile device, a handheld device (such as a mobile phone), a wearable device, a vehicle-mounted device, or a wireless device (such as a communication module, a modem, or a chip system) built into the above devices. The terminal device is used to connect people, things, machines, etc., and can be widely used in various scenarios, such as cellular communication, device-to-device (D2D) communication, V2X communication, machine-to-machine / machine-type communications (M2M / MTC) communication, Internet of Things, virtual reality (VR), augmented reality (AR), industrial control, self-driving, remote medical, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, unmanned aerial vehicle, robot, etc. For example, the terminal device can be a handheld terminal in cellular communication, a communication device in D2D, an Internet of Things device in MTC, a monitoring camera in smart transportation and smart city, or a communication device on an unmanned aerial vehicle, etc. The terminal device can also be referred to as user equipment (UE), user terminal, user device, user unit, user station, terminal, access terminal, access station, UE station, remote station, mobile device, or wireless communication device, etc. The terminal device can also be a terminal device in an IoT system. IoT is an important part of future information technology development, and its main technical feature is to connect objects through communication technology and network, so as to realize the intelligent network of man-machine interconnection and object-object interconnection. In the embodiments of the present application, IoT technology can achieve massive connection, deep coverage, and terminal power saving through, for example, narrow band (NB) technology. In the embodiments of the present application, the device for realizing the function of the terminal device can be a terminal device, or a device capable of supporting the terminal device to realize the function, such as a chip system or a combination device or component that can realize the function of the terminal device, which can be installed in the terminal device.

[0110] The network device and the terminal device can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; can also be deployed on the water surface; and can also be deployed on airplanes, balloons and satellites in the air. The scenarios in which the network device and the terminal device are located are not limited in the embodiments of the present application.

[0111] Exemplarily, the communication system 100 can further include an application function (AF) network element, which is a control plane network function provided by an operator network, and is used to provide application layer information; and the communication system 100 can further include a session management function (SMF) network element, which is a control plane network function provided by an operator network. In the embodiment of the present application, in the case where the AF network element and the SMF network element are included in the communication system 100, the AF can send service-related information to the network device through the SMF.

[0112] In order to facilitate understanding of the embodiments of the present application, first, the basic concepts involved in the present application are described.

[0113] 1. Peak to average power ratio (PAPR): Wireless signals are observed from the time domain as sinusoidal waves with varying amplitudes, and the amplitudes are not constant. The peak value of the signal amplitude in a period is not the same as the peak value of the amplitude in other periods, so the average power of each period is not the same as the peak power. In a long period of time, the peak power is the maximum transient power that occurs with a certain probability, and the probability is usually 0.01% (i.e. 10^-4). The ratio of the peak power at this probability to the total average power of the system is the PAPR.

[0114] PAPR is defined as the ratio of the maximum power of the signal envelope (P peak ) to the average power (P avg ), expressed in decibels (dB), that is

[0115] PAPR is a value that measures the degree of fluctuation of the envelope. The larger the PAPR, the greater the degree of fluctuation of the envelope.

[0116] 2. Harm of excessively high PAPR: Wireless communication system signals need to be transmitted to a long distance and need to be power amplified. Due to the limitation of technology and equipment cost, a power amplifier is usually linearly amplified within a certain range, and if the range is exceeded, the signal will be distorted. Signal distortion can cause the receiving end of the received signal to be unable to correctly parse the signal. In order to ensure that the peak value of the signal is still within the linear range of the power amplifier that can normally amplify the power, it is necessary to reduce the average power of the transmitted signal. This way will result in low efficiency of the power amplifier, or equivalent to a smaller coverage range.

[0117] 3. OFDM: a sequence S m with N d symbols (equal to s m) mapped to corresponding subcarriers, through weighting (that is, precoding, frequency domain windowing, power control, etc.), and then inverse Fourier transform to obtain the time domain signal x m . Optionally, a cyclic prefix is added. Since the signal on a certain carrier of OFDM is represented as a sinc function, there will be a tail on the left and right sides. The tails of multiple carriers may, under certain probabilities, superimpose to form a point with very high peak power at a distance, that is, the use of OFDM waveform is prone to cause the problem of excessively high PAPR.

[0118] Therefore, in order to meet the coverage requirement, a signal generation technology with low PAPR needs to be selected.

[0119] 4. Single carrier: In order to reduce the PAPR of the OFDM waveform, a single carrier waveform can be used to transmit data. A single carrier can be understood as follows: a sequence S d with N m symbols is subjected to N d point Fourier transform to obtain a frequency domain signal S m , which is mapped to corresponding subcarriers, through weighting (that is, precoding, frequency domain windowing, power control, etc.), inverse Fourier transform, to obtain a time domain signal X m . Finally, a cyclic prefix is optionally added. The single carrier includes but is not limited to the following waveforms:

[0120] Single carrier-quadrature amplitude modulation (SC-QAM) waveform, single carrier-offset quadrature amplitude modulation (SC-OQAM) waveform, DFT-s-OFDM waveform, etc. In the embodiments of the present application, the network device and the terminal device can use the single carrier introduced above to communicate.

[0121] In the present application, the DFT-s-OFDM waveform is mainly involved, and the DFT-s-OFDM technology is introduced below.

[0122] 5、DFT-s-OFDM: is a single-carrier technology based on OFDM waveform. Under the same power amplifier, DFT-s-OFDM waveform can provide greater output power and higher power amplifier efficiency than the above-mentioned OFDM waveform, thereby improving coverage and reducing energy consumption. In some embodiments, the DFT-s-OFDM signal is at least one of the following signals: DFT-s-OFDM with FDSS (frequency-domain spectral shaping), DFT-s-OFDM signal carrying real and imaginary part separation, DFT-s-OFDM signal carrying pulse amplitude modulation (PAM) constellation, DFT-s-OFDM signal carrying real and imaginary part separation with additive filter, DFT-s-OFDM signal carrying PAM constellation with additive filter, and SC-OQAM signal.

[0123] The DFT-s-OFDM waveform can be applied to uplink transmission, but in high-frequency communication, due to the limitation of device capability, the PAPR problem is more serious, so the DFT-s-OFDM waveform can also be applied to downlink transmission. The frequency band of high-frequency communication can be 24250MHz to 52600MHz in the NR system, can also be a frequency band higher than 52600MHz supported by the subsequent evolution of the NR system, or can also be a higher frequency band of the next generation communication system, such as a terahertz (THz) frequency band.

[0124] The DFT-s-OFDM technology has a discrete Fourier transform (DFT) process before the OFDM processing process, so the DFT-s-OFDM technology can also be called linear precoding OFDM technology. In order to facilitate understanding, the DFT-s-OFDM technology is briefly introduced in combination with FIG. 2.

[0125] FIG. 2 is a processing flow diagram of a DFT-s-OFDM technology.

[0126] The sending end sequentially performs serial-to-parallel conversion, N-point discrete Fourier transformation (DFT), subcarrier mapping, M-point inverse discrete Fourier transformation (IDFT), parallel-to-serial conversion, cyclic prefix (CP) addition, digital-to-analog conversion (DAC), and the like on the time-domain discrete sequence, and then sends the signal through an antenna port and a channel.

[0127] The receiving end sequentially performs analog-to-digital conversion (ADC), cyclic prefix removal, serial-to-parallel conversion, M-point DFT, subcarrier unmapping, N-point IDFT, and parallel-to-serial conversion on the signal received through the channel and the antenna to obtain a time-domain discrete sequence.

[0128] The sending end can obtain a frequency-domain sequence of the time-domain discrete sequence through N-point DFT. The frequency-domain sequence is input into IDFT after subcarrier mapping, and M-point IDFT is performed, where N < M. Because the length of IDFT is greater than that of DFT, the part of IDFT that is not input is padded with zeros. After IDFT, cyclic prefix addition can avoid symbol interference.

[0129] DFT-s-OFDM has a lower PAPR than general OFDM, which can improve the power transmission efficiency of a mobile terminal, prolong the use time of a battery, and reduce the cost of a terminal.

[0130] 5. Pilot: also referred to as a reference signal, the pilot involved in the present application includes but is not limited to the following reference signals:

[0131] Demodulation reference signals (DMRS), channel state information-reference signals (CSI-RS), tracking reference signals (TRS), sounding reference signals (SRS), phase tracking reference signals (PT-RS), positioning reference signals (PRS), sensing reference signals (SeRS), etc.

[0132] It should be understood that the pilot in the present application can also be a signal capable of being carried on OFDM or single carrier other than the above-mentioned enumerated reference signals, which will not be enumerated one by one here.

[0133] 6. OFDM pilot: OFDM pilot can be directly transmitted on each subcarrier in the frequency domain, and the OFDM pilot and the data subcarrier are orthogonal without interference. The receiver can estimate the channel corresponding to each OFDM pilot subcarrier, and then obtain the channel of the entire frequency band, that is, all subcarriers, and then equalize (remove the channel influence) and demodulate the data carried on other data subcarriers.

[0134] 7. Antenna port: Antenna port is a logical concept, and one antenna port can correspond to one physical transmitting antenna or multiple physical transmitting antennas. In these two cases, the receiver of the terminal does not decompose the signal from the same antenna port. Because from the perspective of the terminal, whether the channel is formed by a single physical transmitting antenna or combined by multiple physical transmitting antennas, the reference signal corresponding to the antenna port defines the antenna port, for example, the DMRS port corresponding to the demodulation reference signal (DMRS), and the terminal can obtain the channel estimation of the antenna port according to the reference signal. Each antenna port corresponds to a time / frequency resource grid, and has its own reference signal. One antenna port is one channel, and the terminal performs channel estimation and data demodulation according to the reference signal corresponding to the antenna port.

[0135] 8、Pilot time, frequency, code division: Time division means that RS corresponding to different antenna ports occupies different time domain resources (such as different OFDM symbols). Frequency division means that reference signals corresponding to different antenna ports occupy different frequency domain resources (such as different subcarriers). Code division means that reference signals corresponding to different antenna ports occupy the same time-frequency resource, and are distinguished by different code domain resources. An example of code division is that 2 antenna ports occupy the same 2 resource elements (REs), and the 2 antenna ports apply orthogonal codes [1, 1], [1, -1] on the 2 resource elements to distinguish them. The time-frequency resources corresponding to the different antenna ports in the above code division form a CDM block, which can also be referred to as a CDM group.

[0136] The above briefly introduces the scenario to which the communication method provided by the embodiments of the present application can be applied in combination with FIG. 1, and introduces the basic concepts that can be involved in the embodiments of the present application, and introduces the concepts of single carrier and pilot in the basic concepts. A DMRS and data signal transmission mode of a single DFT-s-OFDM symbol is shown in FIG. 3. As can be seen from FIG. 3, the DMRS and data signal are time-divisioned in the time domain, which is equivalent to performing DFT on the DMRS and data together, and then mapping to the corresponding subcarriers, and then converting to a time domain signal through IFFT (or IDFT) and sending out. The receiver directly estimates the channel through the DMRS, and then equalizes the data through the estimated channel (for example, removes the influence of the channel), and then demodulates the data.

[0137] The DMRS and data signal transmission mode shown in FIG. 3 above will cause interference of data to DMRS when estimating the channel through DMRS. In turn, it affects the accuracy of channel estimation. If the interference of data to DMRS is reduced, a guard interval (GI) needs to be added between the two, but adding a GI will reduce the spectral efficiency of the system.

[0138] In order to solve the problems existing in the above DMRS and data signal transmission, the present application provides a communication method to realize DMRS and data signal transmission while ensuring the spectral efficiency of the system, so as to improve the performance of pilot transmission in a single carrier system.

[0139] It should be understood that the communication method provided by the embodiments of the present application can be applied to a system that communicates through multiple antenna technology, for example, the communication system 100 shown in FIG. 1. The communication system can include at least one network device and at least one terminal device.

[0140] It should also be understood that the embodiments shown below do not particularly limit the specific structure of the subject performing the method provided by the embodiments of the present application, as long as the subject can communicate according to the method provided by the embodiments of the present application by running a program in which the code of the method provided by the embodiments of the present application is recorded. For example, the method provided by the embodiments of the present application can be performed by a first communication device, and in the absence of a special description, the "first communication device" in the present application can refer to the first communication device itself (for example, a network device, a terminal device), a component (for example, a processor, a chip, or a chip system, etc.) in the first communication device, or a logic module or software capable of realizing all or part of the functions of the first communication device. For another example, the method provided by the embodiments of the present application can be performed by a second communication device, and in the absence of a special description, the "second communication device" in the present application can refer to the second communication device itself (for example, a network device, a terminal device), a component (for example, a processor, a chip, or a chip system, etc.) in the second communication device, or a logic module or software capable of realizing all or part of the functions of the second communication device.

[0141] FIG. 4 is a schematic flowchart of a communication method provided by an embodiment of the present application, including the following steps:

[0142] S410, a first communication device generates a first symbol.

[0143] Exemplarily, in this embodiment, the first communication device is a device for generating and sending the first symbol, which can be a terminal device or a network device. For example, the first communication device is a network device, and the second communication device is a terminal device; or the first communication device and the second communication device can be other functional entities, which can realize corresponding functions, and the present application does not make any limitation in this regard.

[0144] Specifically, the plurality of first subcarriers corresponding to the first symbol are respectively used to carry a plurality of first pilots, and the plurality of second subcarriers corresponding to the first symbol are used to carry part or all of a frequency domain signal obtained by DFT transformation of a data signal. Wherein, the Pth subcarrier block and the P+1th subcarrier block are separated by m-1 second subcarriers, each subcarrier block includes at least one first subcarrier, m is an integer greater than or equal to 2, and P is a positive integer.

[0145] Optionally, the first pilot in this embodiment can be a pilot signal obtained without DFT transformation, for example, the pilot signal is directly mapped on the first subcarrier; or the first pilot can also be a pilot signal obtained by DFT transformation.

[0146] It should be understood that the symbol in the present application can be understood as a time domain resource, and the symbol is one time domain unit in the time domain. The time domain unit can also be referred to as other names. The name of the time domain unit in the present application is not limited in any way, and the name meets the requirements in the embodiment. For the convenience of description, the symbol is taken as an example for description. For example, the symbol involved in the embodiment can be a DFT-s-OFDM symbol or other specific symbols with low PAPR of single carrier.

[0147] Exemplarily, the interval of m-1 second subcarriers between the Pth subcarrier block and the P+1th subcarrier block can be understood as: the interval of m-1 second subcarriers between a certain subcarrier block #1 and the next subcarrier block of the subcarrier block #1.

[0148] Exemplarily, the first subcarrier in the embodiment can also be referred to as a pilot subcarrier, that is, a subcarrier for carrying a pilot signal. The first communication device can map and send the pilot on the first subcarrier. The second subcarrier can also be referred to as a data subcarrier, that is, a subcarrier for carrying a frequency domain signal obtained by DFT of a data signal. The first communication device can map and send the frequency domain signal on the second subcarrier.

[0149] The plurality of first subcarriers corresponding to the first symbol can be understood as: the plurality of first subcarriers in the first symbol, that is, the plurality of first subcarriers within the time domain range of the first symbol. Similarly, the plurality of second subcarriers corresponding to the first symbol can be understood as: the plurality of second subcarriers in the first symbol, that is, the plurality of second subcarriers within the time domain range of the first symbol.

[0150] The subcarrier block described above can be a subcarrier set including at least one first subcarrier. The interval of m-1 second subcarriers between the Pth subcarrier block and the P+1th subcarrier block includes but is not limited to the following possible implementation manners:

[0151] As a possible implementation manner, each subcarrier block in the embodiment can include one first subcarrier, and the interval of m-1 second subcarriers between the Pth first subcarrier and the P+1th first subcarrier, m is an integer greater than or equal to 2, which can be understood as the density of the first subcarrier being 1 / m. The interval of m-1 second subcarriers between the Pth first subcarrier and the P+1th first subcarrier can be understood as: in the embodiment, the plurality of first subcarriers corresponding to the first symbol are discontinuous in the frequency domain.

[0152] For the convenience of understanding, the possible forms of the first subcarrier pattern corresponding to the first symbol in this implementation manner are briefly introduced in (a) to (c) of FIG. 5.

[0153] As shown in (a) of FIG. 5, m=2, that is, there is one pilot subcarrier every 1 data subcarrier in the subcarriers corresponding to one symbol, which can be understood as the density of the pilot subcarriers being 1 / 2.

[0154] As shown in (c) of FIG. 5, m=3, that is, there is one pilot subcarrier every 2 data subcarriers in the subcarriers corresponding to one symbol, which can be understood as the density of the pilot subcarriers being 1 / 3.

[0155] As shown in (c) of FIG. 5, m=4, that is, there is one pilot subcarrier every 3 data subcarriers in the subcarriers corresponding to one symbol, which can be understood as the density of the pilot subcarriers being 1 / 4.

[0156] As another possible implementation, each subcarrier block in the embodiment can include a plurality of first subcarriers, and the Pth subcarrier block and the (P+1)th subcarrier block are separated by m-1 second subcarriers, m being an integer greater than or equal to 2, which can be understood as the density of the subcarrier blocks being 1 / m.

[0157] Optionally, the plurality of first subcarriers included in each subcarrier are continuous in the frequency domain. Among them, the Pth subcarrier block and the (P+1)th subcarrier block are discontinuous in the frequency domain.

[0158] For ease of understanding, the possible forms of the first subcarrier pattern corresponding to the first symbol in this implementation are briefly introduced in conjunction with (d) of FIG. 5.

[0159] As shown in (d) of FIG. 5, m=2, that is, there is one subcarrier block every 1 data subcarrier in the subcarriers corresponding to one symbol, which can be understood as the density of the subcarrier blocks being 1 / 2.

[0160] In this implementation, compared with the first subcarrier pattern in which the Pth first subcarrier and the (P+1)th first subcarrier are separated by m-1 second subcarriers (as shown in (a) to (c) of FIG. 5), the PAPR is slightly larger.

[0161] It should be understood that (a) to (d) of FIG. 5 above are only examples and do not constitute any limitation on the protection scope of the present application. There are many ways of uniformly dispersing the pilot subcarriers in the embodiment, which will not be illustrated one by one here.

[0162] Further, in the embodiment, the plurality of second subcarriers corresponding to the first symbol are used to carry the frequency domain signal generated by DFT of the data signal.

[0163] Exemplarily, in the embodiment, the first communication device, in the process of generating the first symbol, mapping the frequency domain signal on the second subcarriers includes but is not limited to the following possible implementation ways:

[0164] As a possible implementation, all the single-carrier data signals can be transformed into frequency domain signals by DFT, and mapped onto data subcarriers.

[0165] In this implementation, the number of the second subcarriers corresponding to the first symbol is N1, and the first communication device generates the first symbol, including:

[0166] N1 data signals are generated, and N1-point DFT is performed on the N1 data signals to obtain N1 frequency domain signals. Further, the N1 frequency domain signals are respectively mapped onto N1 second subcarriers, where N1 is a positive integer.

[0167] For example, in this implementation, the mapping of the N1 frequency domain signals onto the N1 second subcarriers is shown in (a) of FIG. 6.

[0168] It should be understood that in this implementation, the first communication device can generate data signals based on the number of second subcarriers corresponding to the first symbol. For example, if the number of second subcarriers corresponding to the first symbol is N1, the network device can generate N1 data signals. Thus, it can be ensured that the frequency domain signals obtained by DFT of the data signals can be mapped on data subcarriers, thereby improving the performance of data signal transmission.

[0169] As another possible implementation, the frequency domain signals obtained by DFT of the data signals are mapped on part or all of the second subcarriers, where the second subcarriers on which the frequency domain signals are mapped are referred to as third subcarriers, and the third subcarriers are uniformly distributed.

[0170] In this implementation, the first communication device generates the first symbol, including:

[0171] N2 data signals are subjected to DFT (e.g., N2-point DFT) to obtain N2 frequency domain signals, and the N2 frequency domain signals are mapped onto N2 third subcarriers, where the N2 third subcarriers are part or all of the second subcarriers, and the interval between the Pth third subcarrier and the (P+1)th third subcarrier is P1 subcarriers, where N2, P, and P1 are positive integers.

[0172] For example, the interval of P1 subcarriers between the Pth third subcarrier and the (P+1)th third subcarrier can be understood as that the interval between a certain third subcarrier and the next third subcarrier of the certain third subcarrier is P1 subcarriers, and the P1 subcarriers between the two third subcarriers can include the first subcarriers and / or the second subcarriers.

[0173] Exemplarily, in this implementation, the mapping of the N2 frequency domain signals is onto N2 third subcarriers, the N2 third subcarriers are part of the plurality of second subcarriers as shown in (b) of FIG. 6, the N2 frequency domain signals are the frequency domain signals in group #1, and the frequency domain signals in group #2 can be mapped onto other second subcarriers.

[0174] Optionally, in this implementation, the first communication device can indicate the pattern of the N2 third subcarriers by indication information #1, so that the first communication device and the second communication device reach a consensus on the positions of the N2 third subcarriers in the first symbol. For example, the indication information #1 indicates the density of the N2 third subcarriers and / or the starting position of the N2 third subcarriers in the frequency domain.

[0175] Optionally, in this implementation, the pattern of the N2 third subcarriers is pre-defined by a protocol, for example, the protocol pre-defines the density of the N2 third subcarriers and / or the starting position of the N2 third subcarriers in the frequency domain.

[0176] It should be understood that, in this implementation, the above-mentioned N2 data signals can form a plurality of data signal groups, for example, the first communication device divides the single-carrier data signal into a plurality of data signal groups, each data signal group is subjected to DFT, and then is uniformly inserted into subcarriers, and one of the plurality of data signal groups includes part of the above-mentioned N2 data signals. Each data signal group can be understood as a single-carrier signal. Therefore, the finally transmitted signal is a superposition of a plurality of single-carrier signals, which ensures that the finally transmitted signal still has a relatively low PAPR, especially when the number of transmission groups is small. In addition, in the scenario where the number of data subcarriers corresponding to a symbol is relatively large, more frequency domain signals can be carried, so that part or all of the data subcarriers carry frequency domain signals, which can avoid data signal loss and ensure data transmission performance.

[0177] As another possible implementation, all single-carrier data signals can be subjected to DFT to obtain frequency domain signals, and then are continuously mapped onto all subcarriers corresponding to the first symbol, but if a subcarrier is a pilot subcarrier, the frequency domain signal of this data signal is not mapped.

[0178] In this implementation, the number of the plurality of second subcarriers corresponding to the first symbol is N1, and the number of the plurality of third subcarriers is M, and the first communication device generates the first symbol, including:

[0179] N1+M data signals are generated, and N1+M-point DFT transformation is performed on the N1+M data signals to obtain N1+M frequency domain signals, if a first frequency domain signal corresponds to the first subcarrier, the first frequency domain signal is not mapped; or if the first frequency domain signal corresponds to the second subcarrier, the first frequency domain signal is mapped, wherein N1 and M are positive integers, and the first frequency domain signal is any one of the N1+M frequency domain signals.

[0180] Exemplarily, in this implementation, mapping of N1 frequency domain signals in the N1+M frequency domain signals to N1 second subcarriers is shown in (a) of FIG. 6.

[0181] It should be understood that in this implementation, no mapping is performed on the pilot subcarriers in the process of mapping the frequency domain signals to the subcarriers, which may cause loss of part of the frequency domain signals. For a low code rate scenario, part of the signal loss is allowed, and data parsing is not affected.

[0182] The above-mentioned several data signal mapping schemes to all or part of the data subcarriers through DFT to generate frequency domain signals only serve as examples and do not constitute any limitation on the protection scope of the present application. Mapping of the frequency domain signals can also be implemented through other manners, which will not be illustrated one by one here.

[0183] Further, in this embodiment, the first communication device can send the first symbol to the second communication device after generating the first symbol, and the method flow shown in FIG. 4 further includes:

[0184] S420, the first communication device sends the first symbol to the second communication device, and correspondingly, the second communication device receives the first symbol from the first communication device.

[0185] It should be understood that in this embodiment, the generation and parsing of the symbol are mainly studied, and the transmission of the symbol is not limited. For example, the first communication device can send the symbol to the second communication device through a wireless transmission manner, or other transmission manners, which will not be described here, and the transmission manner of the symbol in the existing or future communication system can be referred to.

[0186] S430, the second communication device parses the first symbol.

[0187] Corresponding to the above-mentioned generation manner of the first symbol, after receiving the first symbol, the terminal device in this embodiment can parse the first symbol based on the positions of the pilot subcarriers and the data subcarriers in the frequency domain in the first symbol.

[0188] Specifically, the second communication device can perform channel estimation based on the plurality of first pilots carried on the pilot subcarriers.

[0189] Exemplarily, if the N1 frequency domain signals are carried on the N1 second subcarriers of the first symbol, the parsing the first symbol comprises: performing N1-point IFFT transformation on the N1 frequency domain signals to obtain N1 data signals, where N1 is a positive integer.

[0190] Exemplarily, if the N2 frequency domain signals are carried on the N2 third subcarriers of the first symbol, the parsing the first symbol comprises: performing IFFT transformation (for example, N2-point IFFT transformation) on the N2 frequency domain signal groups to obtain N2 data signals, the N2 third subcarriers are part or all of the second subcarriers, and a Pth third subcarrier and a (P+1)th third subcarrier are spaced by P1 subcarriers, where N2, P and P1 are positive integers.

[0191] Exemplarily, in order to enable the second communication device to correctly parse the first symbol after receiving the first symbol, the first communication device and the second communication device reach a consensus on the positions of the pilot subcarriers in the first symbol, the method flow shown in FIG. 4 can further comprise:

[0192] S411, the first communication device sends first indication information to the second communication device, and correspondingly, the second communication device receives the first indication information from the first communication device.

[0193] Specifically, the first indication information is used to indicate the pattern of the plurality of first subcarriers, that is, the first indication information indicates the positions of the pilot subcarriers in the first symbol. Exemplarily, the plurality of first subcarriers carry a plurality of first pilots, and the first indication information can also indicate the pattern of the plurality of first pilots, that is, the first subcarriers below can be replaced by the first pilots.

[0194] Optionally, the first indication information can indicate the density of the pilot subcarriers in the first symbol, and / or indicate the starting position of the pilot subcarriers in the first symbol.

[0195] The density of the pilot subcarriers in the first symbol, and / or the starting position of the pilot subcarriers in the first symbol can be pre-defined by a protocol.

[0196] For example, the density of the pilot subcarriers can be configured by a network device, or pre-configured in a protocol, for example, the density of the pilot subcarriers can be configured as 1 / 2, 1 / 3, 1 / 4, 1 / 6, or 1 / 12, that is, can be an integer multiple of 1 / 12, to ensure that there is at least one in one RB, and the pilot subcarriers are uniformly distributed in the RB.

[0197] If the density of the pilot subcarriers in the first symbol is predefined by the protocol, the first indication information indicates the starting position of the pilot subcarriers in the first symbol; or if the starting position of the pilot subcarriers in the first symbol is predefined by the protocol, the first indication information indicates the density of the pilot subcarriers in the first symbol; or if both the density of the pilot subcarriers in the first symbol and the starting position of the pilot subcarriers in the first symbol are predefined by the protocol, the first indication information can not be transmitted.

[0198] Exemplarily, the first indication information indicates the density of the pilot subcarriers in the first symbol by indicating at least one of the following information:

[0199] The number Q of the first subcarriers included in the subcarrier block, 1 / m, m, or m-1. Wherein, Q is an integer greater than 1.

[0200] As a possible implementation, each of the above-mentioned subcarrier blocks includes one first subcarrier.

[0201] In this implementation, the first indication information can indicate the following information to achieve the purpose of indicating the density of the first subcarriers corresponding to the first symbol:

[0202] 1 / m, m, or m-1.

[0203] For example, in the case where the first indication information indicates 1 / m, the density of the first subcarriers corresponding to the first symbol can be known based on the first indication information.

[0204] For another example, in the case where the first indication information indicates m, it can be known based on the first indication information that every m subcarriers in the subcarriers corresponding to the first symbol include one first subcarrier, and the density of the first subcarriers can be indirectly determined as 1 / m based on m.

[0205] For yet another example, in the case where the first indication information indicates m-1, it can be known based on the first indication information that the first P first subcarriers and the first P+1 first subcarriers corresponding to the first symbol are separated by m-1 second subcarriers, and the density of the first subcarriers can be indirectly determined as 1 / m based on m-1.

[0206] As another possible implementation, each of the above-mentioned subcarrier blocks includes a plurality of first subcarriers.

[0207] In this implementation, the first indication information can indicate the following information to achieve the purpose of indicating the pattern of the first subcarriers corresponding to the first symbol:

[0208] 1 / m and the number Q of the first subcarriers included in the subcarrier block, wherein Q is an integer greater than 1.

[0209] For example, in the case that the first indication information indicates 1 / m and Q, the density of the subcarrier block corresponding to the first symbol can be learned based on the first indication information, and the number Q of the first subcarriers included in each subcarrier block can be learned.

[0210] For example, the first indication information indicates the position of the first first subcarrier in the frequency domain resource, so as to achieve the purpose of indicating the position of the pilot subcarrier in the first symbol. The frequency domain resource can be a resource in the frequency domain, such as an RB or an RE.

[0211] For example, the starting position of the pilot subcarrier in the frequency domain resource (or the starting position of the pilot in the frequency domain resource) can be associated with at least one of the following parameters:

[0212] The identity of the terminal device (UE ID), the identity of the cell (Cell ID), the index of the first symbol, the index of the slot, the index of the subframe, the index of the frame, or the identity of the bandwidth part (BWP), etc. For example, the starting position of the pilot subcarrier in the frequency domain resource is related to mod(X, m). Where m represents the density 1 / m of the pilot subcarrier. X is a combination of one or more of the above parameters, such as the sum of multiple parameters. In this way, the interference between users and between cells can be reduced, and the pilot can be allocated to the same subcarrier.

[0213] Optionally, the multiple first pilots in the first symbol can correspond to multiple antenna ports. Different antenna ports can be orthogonally distributed on multiple pilot subcarriers through frequency division, code division, or frequency division and code division. The relationship between the multiple first subcarriers and the antenna ports (or the relationship between the multiple first pilots and the antenna ports, i.e., the first subcarriers below can be replaced by the first pilots) is described below.

[0214] As a possible implementation, a first set of first subcarriers in the multiple first subcarriers corresponds to a first antenna port, and a second set of first subcarriers in the multiple first subcarriers corresponds to a second antenna port, wherein the first set of first subcarriers includes at least one first subcarrier, the second set of first subcarriers includes at least one first subcarrier, and the first set of first subcarriers and the second set of first subcarriers have no intersection.

[0215] In this implementation, different antenna ports can be orthogonally distributed on multiple pilot subcarriers through frequency division, and different antenna ports occupy different subcarriers.

[0216] As an example but not limitation, in this implementation, different antenna ports occupy different subcarriers, and different antenna ports can be evenly distributed on frequency resources. For example, the Pth and P+1th first subcarriers in the first carrier set are spaced by P2 subcarriers, and the Pth and P+1th first subcarriers in the second carrier set are spaced by P3 subcarriers, where P, P2, and P3 are positive integers. P2 and P3 can be the same or different, as shown in FIG. 7. Different antenna ports occupy different pilot subcarriers in sequence.

[0217] As another possible implementation, the plurality of first subcarriers constitute a first CDM block, and the plurality of first subcarriers correspond to the plurality of antenna ports.

[0218] In this implementation, different antenna ports can be orthogonally distributed on a plurality of pilot subcarriers in a code division manner, the plurality of pilot subcarriers constitute a CDM block, the CDM block is associated with N antenna ports, and then one CDM block has N pilot subcarriers, and then an orthogonal cover code (OCC) or different phase offsets (such as where C is a constant, β i is a real number, and k is a subcarrier index) are orthogonal.

[0219] For example, in an OCC-orthogonal CDM block, port 1 transmits [+1, +1]xC respectively, and port 2 transmits [+1, -1]xC respectively. Then the two ports are code-division orthogonal. One CDM block is a contiguous pilot subcarrier.

[0220] As another possible implementation, a first carrier set in the plurality of first subcarriers constitutes a first CDM block, a second carrier set in the plurality of first subcarriers constitutes a second CDM block, the first CDM block corresponds to a plurality of first antenna ports, the second CDM block corresponds to a plurality of second antenna ports, the first carrier set includes at least one first subcarrier, the second carrier set includes at least one first subcarrier, and the first carrier set and the second carrier set have no intersection.

[0221] In this implementation, different antenna ports can be orthogonally distributed on a plurality of pilot subcarriers in a frequency division and code division manner. In this way, more ports can be supported. For example, different CDMs can correspond to different antenna ports. As shown in FIG. 8, CDM block 1 corresponds to port 0 and port 1, and CDM block 2 corresponds to port 2 and port 3.

[0222] It should be understood that the correspondence between the antenna port and the pilot subcarrier can be obtained in the above-mentioned manner, i.e., the pilot subcarriers are distributed on the multiple pilot subcarriers in a frequency division, code division, or frequency division and code division manner, and the correspondence between the antenna port and the pilot subcarrier can also be obtained in another possible implementation manner. For example, the pilot pattern can be fixed in the protocol. In the specific pilot pattern, the antenna port number corresponds to the pilot subcarrier position one by one, and the pilot pattern or the antenna port number is notified by the first communication device, and then the transmitted pilot subcarrier can be obtained.

[0223] Optionally, in this implementation manner, the method flow shown in FIG. 4 can further include the following steps.

[0224] S412, the first communication device sends second indication information to the second communication device, and correspondingly, the second communication device receives the second indication information from the first communication device.

[0225] Specifically, the second indication information indicates one of the multiple pilot patterns, and in each pilot pattern, the multiple first subcarriers correspond to the corresponding antenna port.

[0226] Optionally, the corresponding antenna port of the multiple first subcarriers can constitute multiple CDM blocks. Optionally, the CDM block can correspond to the continuous first subcarrier or the corresponding discrete first subcarrier.

[0227] By way of example but not limitation, the second indication information indicates the identification of the pilot pattern and / or the antenna port number. For example, the multiple antenna port numbers in the pilot pattern can be notified. Optionally, the multiple antenna port numbers can be assigned with the same port attribute, and then one antenna port can use more pilot subcarriers for transmission.

[0228] As shown in FIG. 9(a) and (b). As shown in FIG. 9(a), mode one: ports 0, 1 are a CDM block, and ports 2, 3 are a CDM block, and one CDM block occupies discrete subcarriers. As shown in FIG. 9(b), in mode two, ports 0, 1 are a CDM block, and ports 2, 3 are a CDM block, and one CDM block occupies continuous subcarriers.

[0229] Further, in this embodiment, the pilot of the multiple antenna ports can be distributed in multiple symbols, for example, the method flow shown in FIG. 4 further includes the following steps.

[0230] S413, the first communication device sends second symbols to the second communication device, and correspondingly, the second communication device receives the second symbols from the first communication device.

[0231] Specifically, the second symbol is similar to the first symbol, and the second symbol corresponds to a plurality of fourth subcarriers, each of which is used to carry a plurality of second pilots. The second symbol corresponds to a plurality of fifth subcarriers, which are used to carry part or all of the frequency domain signals. The interval between the Pth fourth subcarrier block and the P+1th fourth subcarrier block in the second symbol is m-1 fifth subcarriers, and each fourth subcarrier block includes at least one fourth subcarrier. The antenna ports corresponding to the first symbol and the second symbol can be the same or different.

[0232] Optionally, the first symbol and the second symbol are two adjacent symbols; or the first symbol and the second symbol can be two symbols with an interval of X1 symbols, and X1 is a positive integer less than a threshold #1.

[0233] If the pilots of the plurality of antenna ports can be distributed in a plurality of symbols, the pilots corresponding to different antenna ports can occupy different time domain resources (such as symbols), that is, different antenna ports can be orthogonally distributed on a plurality of pilot subcarriers in a time division manner.

[0234] As a possible implementation, the antenna ports corresponding to the plurality of first subcarriers and the antenna ports corresponding to the plurality of fourth subcarriers are different.

[0235] In this implementation, different antenna ports can be orthogonally distributed on a plurality of pilot subcarriers in a time division manner, and each symbol transmits different pilots.

[0236] As another possible implementation, at least one of the plurality of first subcarriers and at least one of the plurality of fourth subcarriers constitute a third code division multiplexing (CDM) block.

[0237] In this implementation, different antenna ports can be orthogonally distributed on a plurality of pilot subcarriers in a time division and code division manner, a CDM block contains a plurality of symbols, and a plurality of pilot subcarriers on a plurality of OFDM. As shown in (a) to (c) of FIG. 10. Wherein, the CDM can contain frequency adjacent pilot subcarriers (as shown in (b) of FIG. 10), or frequency non-adjacent pilot subcarriers (as shown in (c) of FIG. 10). Optionally, the OCC code of 4 ports can be: port 1: [1, 1, 1, 1], port 2: [1, 1, -1, -1], port 3: [1, -1, 1, -1], and port 4: [1, -1, -1, 1].

[0238] Exemplarily, under a plurality of OFDM symbols, in order to make the PAPR of each symbol about the same, the pilots of the same antenna port can be allocated on each symbol. A plurality of symbols together make up a pilot density of 1 / m.

[0239] Optionally, the position of pilot subcarriers of each symbol in the frequency domain can be staggered, so as to ensure that each antenna port can transmit pilots on more pilot subcarriers as possible, and improve the channel estimation quality. For example, as shown in FIG. 11, the pilot density of two symbols is 1 / 4, and the joint pilot density of two symbols is 1 / 2.

[0240] In the case where the first communication device transmits a plurality of symbols to the second communication device, the first communication device can indicate the pilot pattern on the plurality of symbols to the second communication device through the third indication information, and the method flow shown in FIG. 4 further includes:

[0241] S414, the first communication device sends the third indication information to the second communication device, and correspondingly, the second communication device receives the third indication information from the first communication device.

[0242] Specifically, the third indication information is used to indicate the position of the first first subcarrier in the frequency domain resource, and / or the position of the first fourth subcarrier in the frequency domain resource, and at least one of the following information: 1 / m, a / m, or a, wherein a indicates the number of symbols used to carry pilots, 1 / m indicates the density of pilots carried on each symbol, and a / m indicates the density of pilots carried on a symbols. Wherein, the frequency domain resource can be a resource in the frequency domain, such as RB or RE, and the like.

[0243] Optionally, the third indication information can indicate the density of pilot subcarriers in the plurality of symbols, and / or indicate the starting position of pilot subcarriers in the plurality of symbols.

[0244] The density of pilot subcarriers in the plurality of symbols, and / or the starting position of pilot subcarriers in the plurality of symbols can be pre-defined by a protocol.

[0245] If the density of pilot subcarriers in the plurality of symbols is pre-defined by a protocol, the third indication information can only indicate the starting position of pilot subcarriers in the plurality of symbols; or, if the starting position of pilot subcarriers in the plurality of symbols is pre-defined by a protocol, the third indication information can only indicate the density of pilot subcarriers in the plurality of symbols; or, if the density of pilot subcarriers in the plurality of symbols and the starting position of pilot subcarriers in the plurality of symbols are both pre-defined, the third indication information can not be sent.

[0246] Exemplarily, the third indication information indicates the density of pilot subcarriers in the plurality of symbols by indicating at least one of the following information:

[0247] 1 / m, a / m, or a. Wherein, the first communication device can configure the pilot density of each symbol and / or the joint pilot density of multiple symbols. For example, the first communication device configures the pilot density of a single symbol as 1 / m, and further configures the number of symbols containing pilots as a, then the joint pilot density of multiple symbols is a / m. Also for example, the first communication device configures the pilot density of multiple symbols as a / m, and further configures the number of symbols containing pilots as a, then the joint pilot density of a single symbol is 1 / m.

[0248] It should be understood that the pilot density of each symbol and / or the joint pilot density of multiple symbols can be predefined by a protocol.

[0249] Optionally, one CDM block can span symbols. As shown in FIG. 12, the pilot subcarriers in different symbols and different frequency domain locations form one CDM block, which is effective when using one or part of the multiple antenna ports of the CDM block. This ensures that each antenna port transmits on as many pilot subcarriers as possible, and can also estimate more pilot subcarriers, thereby improving the quality of channel estimation. Alternatively, the pilot subcarriers in different symbols and same frequency domain locations form one CDM block as shown in FIG. 10 (a) to (c), and the same pilot subcarriers carry the CDM block, which can provide better orthogonality performance because the channel variation of the pilot subcarriers in the same frequency domain location is smaller than that of the pilot subcarriers in different frequency domain locations.

[0250] In addition, in this application, in order to make the PAPR of the symbol in which the pilot subcarriers and the data subcarriers are frequency-divided low enough, the mode of frequency-dividing the pilot subcarriers and the data subcarriers can be constrained so that the terminal device supports certain specific modes. How to constrain the mode supported by the terminal device will be described in detail below in combination with FIG. 13:

[0251] FIG. 13 is a schematic flowchart of another communication method provided by an embodiment of the present application, including the following steps:

[0252] S1310, the terminal device acquires fourth indication information.

[0253] Specifically, the fourth indication information indicates the pilot subcarrier and data subcarrier frequency division mode supported by the terminal device.

[0254] Optionally, the fourth indication information is used to indicate that the terminal device supports transmitting pilots on part of the multiple pilot subcarriers in a certain symbol (such as the first symbol described above). For example, the terminal device supports transmitting pilots on M2 pilot subcarriers in M1 pilot subcarriers corresponding to one symbol, such as M2=1, because the larger M2 is, the worse the PAPR is.

[0255] Optionally, the fourth indication information is used to indicate that the terminal device supports multiple pilots to be transmitted with equal intervals in the frequency domain within a symbol (e.g., the first symbol described above), i.e., one symbol supports pilots with equal intervals in frequency. For example, the terminal device supports the mode one shown in (a) of FIG. 9, because the PAPR is worse for the pilots with unequal intervals (the mode two shown in (b) of FIG. 9).

[0256] Optionally, the fourth indication information is used to indicate that, in the case that m0 is less than the first threshold, the terminal device supports a density (e.g., 1 / m) of pilots corresponding to a symbol to be greater than or equal to 1 / m0. For example, m0=2, the greater m0 is, the worse the PAPR is when m0 is relatively small with respect to the first threshold.

[0257] Optionally, the fourth indication information is used to indicate that, in the case that m0 is greater than the second threshold (e.g., m0=6, the greater m0 is when m0 is relatively large with respect to the second threshold), the terminal device supports a density (e.g., 1 / m) of pilots corresponding to a symbol to be less than or equal to 1 / m0. For example, m0=6, the smaller m0 is, the worse the PAPR is when m0 is relatively large with respect to the second threshold.

[0258] Exemplarily, the fourth indication information is predefined by a protocol, or the fourth indication information is configured by the network device.

[0259] In S1320, the terminal device determines the supported frequency division mode according to the fourth information.

[0260] Specifically, the terminal device determines the supported pilot subcarrier and data subcarrier frequency division mode according to the fourth information described above.

[0261] It should be understood that the size of the serial number of the above processes does not mean the order of execution, and the execution order of the processes should be determined according to their functions and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0262] It should also be understood that in various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be mutually referred to if there is no special description and no logical conflict, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship. For example, the communication method shown in FIG. 4 can be combined with the communication method shown in FIG. 13, i.e., the symbol can be generated and sent by the communication method shown in FIG. 4, and the specific valid mode supported by the terminal device is learned by the communication method shown in FIG. 13, if the received symbol is not generated based on the specific mode supported by the terminal device, the terminal device considers it as an invalid mode and does not perform parsing.

[0263] It should also be understood that in some embodiments described above, the devices in the existing network architecture are mainly exemplarily described (such as the first communication device, the second communication device, and the like), and it should be understood that the specific form of the device is not limited in the embodiments of the present application. For example, devices that can realize the same functions in the future are also applicable to the embodiments of the present application.

[0264] It can be understood that in each of the above method embodiments, the method and operation implemented by the device (such as the first communication device, the second communication device) can also be implemented by a component (for example, a chip or a circuit) of the device.

[0265] The above describes the communication method provided by the embodiments of the present application in detail in combination with FIGS. 4 to 13. The above communication method is mainly introduced from the perspective of the interaction between the terminal device and the network device. It can be understood that the terminal device and the network device contain the corresponding hardware structure and / or software module for executing each function in order to realize the above functions.

[0266] Those skilled in the art should realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in the form of hardware or a combination of hardware and computer software. Whether a certain function is realized in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0267] The communication apparatus provided by the embodiments of the present application is described in detail below in combination with FIGS. 14 to 16. It should be understood that the description of the apparatus embodiments corresponds to the description of the method embodiments. Therefore, the content not described in detail can be referred to the above method embodiments, and part of the content will not be described again for the sake of brevity.

[0268] The embodiments of the present application can divide the functional modules of the transmitting end device or the receiving end device according to the above method examples, for example, each functional module can be divided according to each function, or two or more functions can be integrated in one processing module. The above integrated module can be realized in the form of hardware or in the form of a software functional module. The division of the modules in the embodiments of the present application is illustrative, and is only a logical function division. When actually implemented, there can be another division manner. The following takes the example of dividing each functional module according to each function.

[0269] FIG. 14 is a schematic block diagram of the communication apparatus 10 according to an embodiment of the present application. The apparatus 10 can include a transceiver module 11 and a processing module 12. The transceiver module 11 can be configured to implement corresponding communication functions, and the processing module 12 can be configured to perform data processing. In other words, the transceiver module 11 can be configured to perform operations related to receiving and transmitting, and the processing module 12 can be configured to perform operations other than receiving and transmitting. The transceiver module 11 can also be referred to as a communication interface or a communication unit.

[0270] Optionally, the apparatus 10 can further include a storage module 13, which can be configured to store instructions and / or data. The processing module 12 can read the instructions and / or data stored in the storage module 13, so that the apparatus implements the actions of the devices in the foregoing method embodiments.

[0271] In one design, the apparatus 10 can correspond to the second communication device in the method embodiments described above, or be a component (e.g., a chip) of the second communication device.

[0272] The apparatus 10 can implement the steps or procedures performed by the second communication device in the method embodiments described above. In particular, the transceiver module 11 can be configured to perform operations related to receiving and transmitting of the second communication device in the method embodiments described above, and the processing module 12 can be configured to perform operations related to processing of the second communication device in the method embodiments described above.

[0273] In one possible implementation, the transceiver module 11 can be configured to receive a first symbol, where a plurality of first subcarriers corresponding to the first symbol are respectively used to carry a plurality of first pilots, and a plurality of second subcarriers corresponding to the first symbol are used to carry part or all of a frequency domain signal. The processing module 12 can be configured to parse the first symbol, where a Pth subcarrier block and a P+1th subcarrier block are separated by m-1 second subcarriers, each of the subcarrier blocks includes at least one first subcarrier, m is an integer greater than or equal to 2, the frequency domain signal is obtained by performing a discrete Fourier transform (DFT) on a data signal, and P is a positive integer.

[0274] When the apparatus 10 is configured to perform the method in FIG. 4, the transceiver module 11 can be configured to perform the steps of receiving and transmitting information in the method, such as steps S420, S411, S412, S413, and S414, and the processing module 12 can be configured to perform the processing steps in the method, such as step S430.

[0275] When the apparatus 14 is configured to perform the method in FIG. 13, the transceiver module 11 can be configured to perform the steps of receiving and transmitting information in the method, and the processing module 12 can be configured to perform the processing steps in the method, such as steps S13100 and S1320.

[0276] It should be understood that the specific process of each unit performing the corresponding steps described above has been described in detail in the method embodiments described above, and will not be repeated here for brevity.

[0277] In another design, the apparatus 10 can correspond to, or be a component (e.g., a chip) of, the first communication device in the method embodiments described above.

[0278] The apparatus 10 can implement the steps or procedures performed by the first communication device in the method embodiments described above, where the transceiver module 11 can be configured to perform the transceiving-related operations of the first communication device in the method embodiments described above, and the processing module 12 can be configured to perform the processing-related operations of the first communication device in the method embodiments described above.

[0279] In one possible implementation, the processing module 12 is configured to generate a first symbol, where a plurality of first subcarriers corresponding to the first symbol are used to carry a plurality of first pilots, and a plurality of second subcarriers corresponding to the first symbol are used to carry part or all of a frequency domain signal. The transceiver module 11 is configured to send the first symbol, where a Pth subcarrier block and a P+1th subcarrier block are separated by m-1 second subcarriers, each of the subcarrier blocks includes at least one first subcarrier, m is an integer greater than or equal to 2, the frequency domain signal is obtained by performing discrete Fourier transform (DFT) on a data signal, and P is a positive integer.

[0280] When the apparatus 10 is used to perform the method in FIG. 4, the transceiver module 11 can be configured to perform the steps of transmitting and receiving information in the method, such as steps S420, S411, S412, S413, and S414, and the processing module 12 can be configured to perform the processing steps in the method, such as step S410.

[0281] It should be understood that the specific process of each unit performing the corresponding steps described above has been described in detail in the method embodiments described above, and will not be repeated here for brevity.

[0282] It should also be understood that the apparatus 10 herein is embodied in the form of a functional block diagram. The term "module" herein can refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (shared, dedicated or group) and memory that execute one or more software or firmware programs, a combinational logic circuit, and / or other suitable components that provide the described functionality. In one optional example, those skilled in the art can understand that the apparatus 10 can be embodied in the form of the mobile management network element in the above-mentioned embodiments, and can be used to execute the processes and / or steps corresponding to the mobile management network element in the above-mentioned method embodiments. Alternatively, the apparatus 10 can be embodied in the form of the terminal device in the above-mentioned embodiments, and can be used to execute the processes and / or steps corresponding to the terminal device in the above-mentioned method embodiments. To avoid repetition, details are not described herein.

[0283] The apparatus 10 of each of the above-mentioned schemes has the function of implementing the corresponding steps performed by the device (such as the first communication device and the second communication device) in the above-mentioned methods. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions; for example, the transceiver module can be replaced by a transceiver (for example, the sending unit in the transceiver module can be replaced by a transmitter, and the receiving unit in the transceiver module can be replaced by a receiver), and other units, such as the processing module, can be replaced by a processor, which respectively performs the transceiving operations and related processing operations in each of the method embodiments.

[0284] In addition, the above-mentioned transceiver module 11 can also be a transceiver circuit (for example, which can include a receiving circuit and a sending circuit), and the processing module can be a processing circuit.

[0285] FIG. 15 is a schematic diagram of another communication apparatus 20 provided by the embodiments of the present application. The apparatus 20 includes a processor 21, which is configured to execute computer programs or instructions stored in a memory 22, or read data / signaling stored in the memory 22, to perform the methods in the above-mentioned method embodiments. Optionally, the processor 21 is one or more.

[0286] Optionally, as shown in FIG. 15, the apparatus 20 further includes the memory 22, which is configured to store computer programs or instructions and / or data. The memory 22 can be integrated with the processor 21, or can be separately arranged. Optionally, the memory 22 is one or more.

[0287] Optionally, as shown in FIG. 15, the apparatus 20 further includes a transceiver 23, which is configured to receive and / or send signals. For example, the processor 21 is configured to control the transceiver 23 to receive and / or send signals.

[0288] As one aspect, the apparatus 20 is configured to perform operations for the methods described above.

[0289] As another aspect, the apparatus 20 is configured to perform operations for the methods described above.

[0290] It should be understood that the processor as mentioned in the embodiments of the present application can be a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can be any conventional processor.

[0291] It should also be understood that the memory as mentioned in the embodiments of the present application can be a volatile memory or a non-volatile memory. The non-volatile memory can be a read-only memory (ROM), a programmable ROM (PROM), an erasable PROM (EPROM), an electrically EPROM (EEPROM) or a flash memory. The volatile memory can be a random access memory (RAM). For example, the RAM can be used as an external cache. By way of example and not limitation, the RAM includes a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM) and direct rambus RAM (DR RAM).

[0292] When the processor is a general processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) can be integrated in the processor.

[0293] The memory described herein is intended to include, but not limited to, these and any other suitable type of memory.

[0294] FIG. 16 is a schematic diagram of a chip system 30 according to an embodiment of the present application. The chip system 30 (or also referred to as a processing system) includes a logic circuit 31 and an input / output interface 32.

[0295] The logic circuit 31 can be a processing circuit in the chip system 30. The logic circuit 31 can be coupled to a storage unit, and invoke instructions in the storage unit, so that the chip system 30 can implement the methods and functions of the embodiments of the present application. The input / output interface 32 can be an input / output circuit in the chip system 30, and output information processed by the chip system 30, or input data or signaling information to be processed by the chip system 30.

[0296] As an option, the chip system 30 is configured to implement the operations performed by the first communication device or the second communication device in the above method embodiments.

[0297] For example, the logic circuit 31 is configured to implement the processing-related operations performed by the first communication device or the second communication device in the above method embodiments; and the input / output interface 32 is configured to implement the sending and / or receiving-related operations performed by the first communication device or the second communication device in the above method embodiments.

[0298] The embodiments of the present application also provide a computer readable storage medium, which has stored thereon computer instructions for implementing the method performed by the first communication device or the second communication device in the above method embodiments.

[0299] For example, the computer program, when executed by a computer, enables the computer to implement the method performed by the first communication device or the second communication device in the above method embodiments.

[0300] The embodiments of the present application also provide a computer program product, which includes instructions, and the instructions, when executed by a computer, implement the method performed by the first communication device or the second communication device in the above method embodiments.

[0301] The embodiments of the present application also provide a communication system, which includes the first communication device and the second communication device described above.

[0302] The explanations and beneficial effects of the related content in any one of the above provided devices can refer to the corresponding method embodiments provided above, and will not be repeated here.

[0303] Those skilled in the art can clearly understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0304] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0305] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the above-described device embodiments are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0306] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. According to actual needs, part or all of the units can be selected to achieve the purpose of the embodiment.

[0307] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0308] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the parts that contribute to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and various media that can store program codes.

Claims

1. A communication method, characterized in that: include: Generate a first symbol, where multiple first subcarriers corresponding to the first symbol are respectively used to carry multiple first pilots, and multiple second subcarriers corresponding to the first symbol are used to carry part or all of a frequency domain signal, where the frequency domain signal is obtained by performing a discrete Fourier transform (DFT) on the data signal; Sending the first symbol, There are m-1 second subcarriers between the P-th subcarrier block and the P+1-th subcarrier block, each of the subcarrier blocks includes at least one first subcarrier, m is an integer greater than or equal to 2, and P is a positive integer.

2. The method according to claim 1, characterized in that The number of the plurality of second subcarriers is N1, and the generating of the first symbol includes: Generate N1 data signals, and perform N1-point DFT transform on the N1 data signals to obtain N1 frequency domain signals; Mapping the N1 frequency domain signals to N1 second subcarriers respectively, Wherein, N1 is a positive integer.

3. The method according to claim 1, characterized in that Generating the first symbol includes: Performing DFT transformation on the N2 data signals to obtain N2 frequency domain signals; Mapping the N2 frequency domain signals to N2 third subcarriers, where the N2 third subcarriers are part or all of the multiple second subcarriers, and an interval of P1 subcarriers between the Pth third subcarrier and the P+1th third subcarrier is P1 subcarriers, Wherein, N2, P, and P1 are positive integers.

4. The method according to claim 1, wherein If the number of the plurality of second subcarriers is N1 and the number of the plurality of first subcarriers is M, generating the first symbol includes: Generate N1+M data signals, and perform N1+M-point DFT transformation on the N1+M data signals to obtain N1+M frequency domain signals; If the subcarrier corresponding to the first frequency domain signal is the first subcarrier, the first frequency domain signal is not mapped; or, If the subcarrier corresponding to the first frequency domain signal is the second subcarrier, the first frequency domain signal is mapped, Wherein, N1 and M are positive integers, and the first frequency domain signal is any one of the N1+M frequency domain signals.

5. The method according to any one of claims 1 to 4, characterized in that The method further comprises: First indication information is sent, where the first indication information is used to indicate a pattern of the multiple first subcarriers.

6. The method according to claim 5, characterized in that The first indication information is used to indicate a position of a first first subcarrier among the multiple first subcarriers on the frequency domain resource and at least one of the following information: The number of the first subcarriers included in the subcarrier block, 1 / m, m, or m-1.

7. The method according to any one of claims 1 to 6, characterized in that The position of the first subcarrier on the frequency domain resource is associated with at least one of the following parameters: The identifier of the terminal device, the identifier of the cell, the index of the first symbol, the index of the time slot, the index of the subframe, the index of the frame, or the identifier of the partial bandwidth BWP.

8. The method according to any one of claims 1 to 7, characterized in that A first subcarrier set in the plurality of first subcarriers corresponds to a first antenna port, and a second subcarrier set in the plurality of first subcarriers corresponds to a second antenna port. The first subcarrier set includes at least one of the first subcarriers, the second subcarrier set includes at least one of the first subcarriers, and there is no intersection between the first subcarrier set and the second subcarrier set.

9. The method according to claim 8, characterized in that There is a P2 subcarrier interval between the Pth first subcarrier and the P+1th first subcarrier in the first carrier set, and a P3 subcarrier interval between the Pth first subcarrier and the P+1th first subcarrier in the second carrier set, where P, P2, and P3 are positive integers.

10. The method according to any one of claims 1 to 9, characterized in that The multiple first subcarriers constitute a first code division multiplexing (CDM) block, and the multiple first subcarriers correspond to multiple antenna ports.

11. The method according to any one of claims 1 to 10, characterized in that A first carrier set in the plurality of first subcarriers constitutes a first code division multiplexing (CDM) block, and a second carrier set in the plurality of first subcarriers constitutes a second CDM block. The first CDM block corresponds to multiple first antenna ports, the second CDM block corresponds to multiple second antenna ports, the first carrier set includes at least one first subcarrier, the second carrier set includes at least one first subcarrier, and there is no intersection between the first carrier set and the second carrier set.

12. The method according to any one of claims 1 to 11, characterized in that The method further comprises: Second indication information is sent, where the second indication information indicates one of a plurality of pilot modes, and in each of the pilot modes, corresponding antenna ports corresponding to the plurality of first subcarriers.

13. The method according to any one of claims 1 to 12, characterized in that The method further comprises: Sending a second symbol, where multiple fourth subcarriers corresponding to the second symbol are respectively used to carry multiple second pilots, and multiple fifth subcarriers of the second symbol are used to carry part or all of the frequency domain signal; The Pth fourth subcarrier block and the P+1th fourth subcarrier block are separated by m-1 fifth subcarriers, each subcarrier block includes at least one fourth subcarrier, m is an integer greater than or equal to 2, the frequency domain signal is obtained by DFT transforming the data signal, and P is a positive integer.

14. The method according to claim 13, wherein: At least one first subcarrier among the plurality of first subcarriers and at least one fourth subcarrier among the plurality of fourth subcarriers constitute a third code division multiplexing (CDM) block.

15. The method according to claim 13 or 14, characterized in that The method further comprises: Third indication information is sent, where the third indication information is used to indicate a pilot pattern on a plurality of symbols.

16. The method according to claim 15, characterized in that The third indication information is used to indicate a position of the first first subcarrier on the frequency domain resources of the resource block, and / or a position of the first fourth subcarrier on the frequency domain resources, and at least one of the following information: 1 / m, a / m, or a, Here, a indicates the number of symbols used to carry pilots, 1 / m indicates the density of pilots carried on each symbol, and a / m indicates the density of pilots carried on a symbols.

17. A communication method, characterized in that: include: receiving a first symbol, where a plurality of first subcarriers corresponding to the first symbol are respectively used to carry a plurality of first pilots, and a plurality of second subcarriers corresponding to the first symbol are used to carry part or all of a frequency domain signal; Parsing the first symbol, There are m-1 second subcarriers between the P-th subcarrier block and the P+1-th subcarrier block, each subcarrier block includes at least one first subcarrier, m is an integer greater than or equal to 2, the frequency domain signal is obtained by transforming the data signal through discrete Fourier transform DFT, and P is a positive integer.

18. The method according to claim 17, characterized in that The N1 second subcarriers of the first symbol carry N1 frequency domain signals, and the parsing the first symbol includes: Performing N1-point inverse fast Fourier transform (IFFT) on the N1 frequency domain signals to obtain N1 data signals. Wherein, N1 is a positive integer.

19. The method according to claim 17, wherein The N2 third subcarriers of the first symbol carry N2 frequency domain signals, and parsing the first symbol includes: Performing an inverse fast Fourier transform (IFFT) on the N2 frequency domain signal groups to obtain N2 data signals, where the N2 third subcarriers are part or all of the multiple second subcarriers, and the Pth third subcarrier and the P+1th third subcarrier are separated by P1 subcarriers. Wherein, N2, P, and P1 are positive integers.

20. The method according to any one of claims 17 to 19, characterized in that The method further comprises: First indication information is received, where the first indication information is used to indicate a pattern of the plurality of first subcarriers.

21. The method according to claim 20, characterized in that The first indication information is used to indicate a position of a first first subcarrier among the multiple first subcarriers on the frequency domain resource and at least one of the following information: The number of the first subcarriers included in the subcarrier block, 1 / m, m, or m-1.

22. The method according to any one of claims 17 to 21, characterized in that The position of the first subcarrier on the frequency domain resource is associated with at least one of the following parameters: The identifier of the terminal device, the identifier of the cell, the index of the first symbol, the index of the time slot, the index of the subframe, the index of the frame, or the identifier of the partial bandwidth BWP.

23. The method according to any one of claims 17 to 22, characterized in that A first carrier set in the plurality of first subcarriers corresponds to a first antenna port, and a second carrier set in the plurality of first subcarriers corresponds to a second antenna port. The first carrier set includes at least one of the first subcarriers, the second carrier set includes at least one of the first subcarriers, and there is no intersection between the first carrier set and the second carrier set.

24. The method according to claim 23, wherein There is a P2 subcarrier interval between the Pth first subcarrier and the P+1th first subcarrier in the first carrier set, and a P3 subcarrier interval between the Pth first subcarrier and the P+1th first subcarrier in the second carrier set, where P, P2, and P3 are positive integers.

25. The method according to any one of claims 17 to 24, characterized in that The multiple first subcarriers constitute a first code division multiplexing (CDM) block, and the multiple first subcarriers correspond to multiple antenna ports.

26. The method according to any one of claims 17 to 25, characterized in that A first carrier set in the plurality of first subcarriers constitutes a first code division multiplexing (CDM) block, and a second carrier set in the plurality of first subcarriers constitutes a second CDM block. The first CDM block corresponds to multiple first antenna ports, the second CDM block corresponds to multiple second antenna ports, the first carrier set includes at least one first subcarrier, the second carrier set includes at least one first subcarrier, and there is no intersection between the first carrier set and the second carrier set.

27. The method according to any one of claims 17 to 26, characterized in that The method further comprises: Second indication information is received, where the second indication information indicates one of a plurality of pilot patterns, and in each of the pilot patterns, corresponding antenna ports corresponding to the plurality of first subcarriers.

28. The method according to any one of claims 17 to 27, characterized in that The method further comprises: receiving a second symbol, where multiple fourth subcarriers of the second symbol are used to carry multiple second pilots respectively, and multiple fifth subcarriers of the second symbol are used to carry part or all of the frequency domain signal; The Pth fourth subcarrier block and the P+1th fourth subcarrier block are separated by m-1 fifth subcarriers, each of the fourth subcarrier blocks includes at least one fourth subcarrier, m is an integer greater than or equal to 2, the frequency domain signal is obtained by DFT transforming the data signal, and P is a positive integer.

29. The method according to claim 28, characterized in that At least one first subcarrier among the plurality of first subcarriers and at least one fourth subcarrier among the plurality of fourth subcarriers constitute a third code division multiplexing (CDM) block.

30. The method according to claim 28 or 29, characterized in that The method further comprises: Third indication information is received, where the third indication information is used to indicate a pilot pattern on a plurality of symbols.

31. The method according to claim 30, wherein The third indication information is used to indicate a position of the first first subcarrier on the frequency domain resource, and / or a position of the first fourth subcarrier on the frequency domain resource, and at least one of the following information: 1 / m, a / m, or a, Here, a indicates the number of symbols used to carry pilots, 1 / m indicates the density of pilots carried on each symbol, and a / m indicates the density of pilots carried on a symbols.

32. The method according to any one of claims 17 to 31, characterized in that The method further comprises: Obtain fourth indication information, where the fourth indication information is used to indicate at least one of the following: The first symbol supports transmission of N3 first pilots on N3 first subcarriers among a plurality of first subcarriers, where the N3 first subcarriers are part of the plurality of first subcarriers; or, The first symbol supports the sending of the multiple first pilots at equal intervals in the frequency domain; or, If m0 is less than the first threshold, then 1 / m is greater than or equal to 1 / m0; or; If m0 is greater than the second threshold, 1 / m is less than or equal to 1 / m0.

33. A communication device, characterized in that: The device comprises a processor configured to execute a computer program or instruction, so that the communication device executes the method according to any one of claims 1 to 16, or the communication device executes the method according to any one of claims 17 to 32.

34. The communication device according to claim 33, wherein: Also included is a memory for storing the computer program or instructions.

35. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program or instructions, and when the computer program or instructions are executed on a computer, the computer is caused to perform the method according to any one of claims 1 to 32.

36. A chip system, characterized in that: It comprises: a processor, configured to call and run a computer program from a memory, so that a communication device equipped with the chip system executes the method according to any one of claims 1 to 32.

37. A computer program product, characterized in that When the computer program product is run on a computer, the computer is caused to perform the method according to any one of claims 1 to 32.

38. A communication device, characterized in that: Comprising means for performing the method of any one of claims 1 to 32.

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