TW201724788A - Method and apparatus for processing DRMS signals in a wireless communication system - Google Patents

Abstract

The present invention relates to a method and apparatus for processing DMRS signal in a LTE protocol-based base station and an user equipment. According to one aspect of the present invention, the method comprises a method for processing DMRS signal in a LTE protocol-based base station, wherein before performing OFDMA modulation, the method further comprises: - performing pattern rotation processing with OCCs on subcarriers corresponding to available DMRS antenna ports so as to reduce power imbalance between OFDM symbols generated subsequently. The solution according to the present invention may eliminate or reduce the imbalance issue between OFDM symbols of the DMRS enhancement technology in the existing LTE protocol.

Description

Method and apparatus for processing demodulation reference signals in a wireless communication system

The present invention relates to wireless communication technologies, and more particularly to a method and apparatus for processing a Demodulation Reference Signal (DMRS) signal in a Long Term Evolution (LTE) based wireless communication system.

In the LTE R13 agreement, the 3rd Generation Partnership Project (3GPP) organization has decided to consider using DMRS enhancement technology to better support downlink multi-user multiple input multiple output (MU-MIMO). In this regard, some alternatives have been proposed in Technical Report TR36.897 to support extended downlink DMRS for reducing mutual interference between DMRSs. In the alternative 1 proposed by the current 3GPP, an orthogonal cover code (OCC)=4 and 12 resource elements (REs) are used in each physical resource block (PRB), that is, Enhancements based on existing antennas 、 7, 8, 11, 13 have several advantages, such as a minimum of reference signal (RS) additions, no additional RE puncturing, and are invisible to MU operations. Therefore, it is very likely to be supported by 3GPP. However, the current DMRS pattern would cause Option 1 to have a power jitter problem between the OFDM symbols in which the DMRS is located. This is the so-called power imbalance problem, which needs to be avoided when using reference signal design. In order to solve this problem, the present invention proposes a solution to solve this problem based on the use of a new OCC type scheme for extended DMRS. In the current LTE agreement, there are two OCC types as follows: Where p is the antenna apostrophe; in the alternative 1 of TR 36.897 above, the two OCC patterns are alternately cycled over the DMRS subcarriers corresponding to the seventh, eighth, eleventh, and thirteenth antennas. The sequence used by each 定义 is defined by the following Walsh transform code: If rewritten as walsh matrix Round transformation and Can be expressed as and . Assuming that there are four multi-user layers (MU layers), the associated precoding weights of the nth transmission antenna on the eNB side can be expressed as . Then, as shown in FIG. 1, the transmission power of the nth transmission antenna on the four DMRS OFDM symbols in one subframe are respectively: Due to precoding vector Depending on the channel conditions, the DMRS transmission power for the above four symbols is different. Worst case versus One of the sequences matches. For example, if ,then And This can result in power jitter between OFDM symbols, resulting in a power imbalance between OFDM symbols.

The purpose of the present invention is to solve the problem of OFDM inter-symbol imbalance existing under the DMRS enhancement technology in the existing LTE protocol. According to a first aspect of the present invention, a method for processing a DMRS signal in a base station based on an LTE protocol is provided, wherein the method further comprises: - performing on the subcarrier corresponding to the available DMRS antenna 进行 before performing the OFDMA modulation The OCC performs a pattern rounding process to reduce the power imbalance between the subsequently generated OFDM symbols. According to a second aspect of the present invention, a method for processing a DMRS signal in an LTE-based user equipment is provided, comprising: on a subcarrier corresponding to an available DMRS antenna 中 in an OFDM demodulated data block The OCC performs a reverse process from the pattern rotation process in the method according to the first aspect of the present invention. According to a third aspect of the present invention, there is provided an apparatus for processing a DMRS signal in a base station based on an LTE protocol, wherein before performing OFDMA modulation, the apparatus further comprises: a pattern rotation processing apparatus for The OCC on the corresponding subcarrier of the DMRS antenna performs a pattern rotation process to reduce the power imbalance between the subsequently generated OFDM symbols. According to a fourth aspect of the present invention, there is provided an apparatus for processing a DMRS signal in an LTE-based user equipment, comprising: a pattern rotation inverse processing apparatus, configured to perform OFDM-demodulated data blocks The processing of the OCC on the subcarrier corresponding to the DMRS antenna 可用 can be reversed from the above-described pattern rotation processing in the base station according to the third aspect of the present invention. According to the solution of the present invention, the problem of imbalance between OFDM symbols existing under the DMRS enhancement technology in the existing LTE protocol can be eliminated or reduced.

While the invention may be susceptible to various modifications and alternative forms, It should be understood, however, that the invention is not intended to be The same reference numbers will be used throughout the description of the drawings. It should be mentioned before discussing the exemplary embodiments in more detail that some exemplary embodiments are described as a process or method depicted as a flowchart. Although the flowcharts describe various operations as a sequential process, many of the operations can be implemented in parallel, concurrently, or concurrently. In addition, the order of operations can be rearranged. The process may be terminated when its operation is completed, but may have additional steps not included in the drawings. This processing may correspond to methods, functions, procedures, subroutines, subroutines, and the like. The term "wireless device" or "device" as used herein may be considered synonymous with the following and may sometimes be referred to as the following: client, user device, mobile station, mobile user, Mobile terminals, users, users, remote stations, access terminals, receivers, mobile units, etc., and can describe remote users of wireless resources in a wireless communication network. Similarly, the term "base station" as used herein may be considered synonymous with the following and may sometimes be referred to as the following: Node B, evolved Node B, eNodeB, transceiver base station ( BTS), RNC, etc., and may describe a transceiver that communicates with and provides wireless resources to a mobile terminal that can span multiple technical generations. In addition to the ability to implement the methods discussed herein, the base stations discussed herein can have all of the functionality associated with conventional well-known base stations. The methods discussed below, some of which are illustrated by flowcharts, can be implemented by hardware, software, firmware, mediation software, microcode, hardware description language, or any combination thereof. When implemented in software, firmware, mediation software or microcode, the code or code segments used to carry out the necessary tasks can be stored in a machine or computer readable medium (such as a storage medium). The processor(s) can perform the necessary tasks. The specific structural and functional details disclosed herein are merely representative and are for the purpose of describing exemplary embodiments of the invention. The present invention may, however, be embodied in many alternative forms and should not be construed as being limited only to the embodiments set forth herein. It will be understood that, although the terms "first", "second", and the like may be used herein to describe the various elements, such elements should not be limited by the terms. The use of such terms is only intended to distinguish one unit from another. For example, a first unit could be termed a second unit without departing from the scope of the exemplary embodiments, and similarly the second unit could be termed a first unit. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items. It will be understood that when a unit is referred to as "connected" or "coupled" to another unit, it can be directly connected or coupled to the other unit, or an intermediate unit can be present. In contrast, when a unit is referred to as "directly connected" or "directly coupled" to another unit, there is no intermediate unit. Other words used to describe the relationship between units should be interpreted in a similar manner (eg "between" and "directly between" and "close to" compared to "directly with" Proximity, etc.). The terminology used herein is for the purpose of describing the particular embodiments, The singular forms "a", "an", and <RTIgt; It is also to be understood that the terms "comprises" and / or "comprising" are used to mean the existence of the recited features, integers, steps, operations, units and/or components, and do not exclude the presence or addition of one or more Other features, integers, steps, operations, units, components, and/or combinations thereof. It should also be noted that, in some alternative implementations, the functions/acts noted may occur in a different order than that illustrated in the drawings. For example, two figures shown in succession may in fact be executed substantially concurrently or sometimes in the reverse order, depending on the function/acts involved. All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art, unless otherwise defined. It should also be understood that, unless explicitly defined herein, such terms as defined in the commonly used dictionary should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be idealized. Or too formal meaning to explain. Portions of the exemplary embodiments and corresponding detailed description are given by software or algorithms within the computer memory and symbolic representations of operations on the data bits. These descriptions and representations are used to convey a description and representation of the substance of the work to others skilled in the art. As is commonly used, the term "algorithm" as used herein is conceived to be a self-consistent sequence of steps to achieve the desired result. These steps are those steps that require physical manipulation of the number of entities. Usually, but not necessarily, such quantities are in the form of optical, electrical, or magnetic signals that can be stored, transferred, combined, compared, and otherwise manipulated. It has proven convenient at times, principally for reasons of common usage, to refer to such signals as bits, values, elements, symbols, characters, terms, digits, and so forth. In the following description, illustrative embodiments are described with reference to the acts of the program modules or functional processes and the symbolic representation of the operations, such as in the form of a flowchart, which includes implementation specific Tasks or implementations of routines, programs, objects, components, data structures, etc. of a particular abstract data type, and can be implemented using existing hardware at existing network elements. Such existing hardware may include one or more central processing units (CPUs), digital signal processors (DSPs), special application integrated circuits, field programmable gate array (FPGA) computers, and the like. It should be recognized, however, that all such and similar terms should be associated with the appropriate number of entities and are applied only to the number of convenience labels. Terms such as "processing", "calculating", "determining" or "displaying" refer to the actions and processing of computer systems or similar electronic computing devices, unless explicitly stated otherwise or apparent from the discussion. Manipulating the data of the physical and electronic quantities of the scratchpad and memory in the computer system and converting it into similarly represented as computer memory or scratchpad or other such information storage, Transfer or display additional information about the number of entities in the device. It should also be noted that the software implementation aspects of the exemplary embodiments are typically encoded on some form of program storage medium or implemented by some type of transmission medium. The program storage medium can be a magnetic (eg, floppy or hard drive) or optical (eg, compact disc-read only memory or "CD ROM") storage medium and can be a read-only or random access storage medium. Similarly, the transmission medium can be twisted pair, coaxial cable, fiber optics, or some other suitable transmission medium known in the art. The exemplary embodiments are not limited by the scope of any given implementation. The processor and memory can operate together to run device functions. For example, the memory can store code segments for device functionality. The code segment can also be executed by a processor. In addition, the memory can store processing variables and constants for use by the processor. 4 shows a method for processing a DMRS signal in a base station based on an LTE protocol in accordance with an aspect of the present invention. Wherein, as shown in FIG. 4: in step S401, the base station performs pattern rotation processing on the OCC on the subcarrier corresponding to the available DMRS antenna , to reduce the power imbalance between the subsequently generated OFDM symbols; then in step S402 The base station performs OFDM modulation on the data block including the type rotation processing on the OCC to generate an OFDM symbol. That is, in order to solve the problem of power imbalance between OFDM symbols existing in the DMRS enhancement technology of the existing LTE protocol, the base station according to the present invention performs pattern rotation by using the OCC pattern on the subcarrier corresponding to the available DMRS antenna 埠Processing, and then performing OFDM modulation on the data block including the pattern rotation processing on the OCC to generate an OFDM symbol. Specifically, the above-described pattern rotation process includes, but is not limited to, a certain degree of transformation of the OCC wheel transformation sample used by the DMRS in the pattern, for example, based on column permutation and frequency dependent code transformation. Two implementations based on column permutation and frequency dependent code conversion are given below. Based on the column permutation scheme: in step S401, the step of performing the type rotation processing on the OCC on the subcarrier corresponding to the available DMRS antenna 包含 includes: - using the following formula for the subcarrier corresponding to the available DMRS antenna 埠M=4 DMRS OCC round transformation samples: (1) Among them, a 4×4 permutation matrix, ie Each of the columns is different and is selected from the following collections: , and the following conditions are met: (2). The following is based on the four antennas 埠7/8/11/13 specified in the current LTE protocol for DMRS enhancement. Two examples are used to further illustrate the above scheme based on column permutation: Example 1 : for: Obviously, To satisfy the conditions of the above formula (2), as shown in Figure 2, the OCC rotation pattern is: . Here, as shown in the following formula, it can be easily verified that the transmission power between the DMRS symbols after column replacement in this example is the same. If the number of PRBs is an integer multiple of 4, the rotated DMRS OCC pattern (hereinafter referred to as "OCC pattern") based on this example eliminates the power jitter problem between different symbols. Substituting the above rotated OCC pattern into the original walsh matrix, it can be seen in this example that 埠7/8 still maintains the same rotation pattern as R12. , DM11/13 on the DMRS OCC type is transformed into: . As a preferred solution, since the OCC pattern on the 埠7/8 is unchanged, this example can be compatible with the R12 and earlier user devices in the DMRS enhancement technique. In general, in addition to the example 1, in order to support R12 and earlier user devices in the DMRS enhancement technology, Another limitation of the choice is to ensure that the OCC round transformation of the 埠7/8 is the same as the OCC version specified in the R12 Agreement. Examples 2: In this example, for: Similarly, The condition of formula (2) is also satisfied. The OCC round transformation is: . It can be seen that the above OCC rotation pattern is in the form of a cyclic displacement, and it can be easily verified that the OCC wheel transition sample based on this example also eliminates the power jitter problem between different symbols, and does not change the 埠7/8 defined in R12. The transformation of the round. Since the DMRS enhancement technique has one PRB per OFDM symbol In the case of REs, the method of column permutation can only achieve power equalization in a PRB with an integer multiple of four. This also requires a certain limitation on the channel frequency selectivity, that is, the channel frequency selection characteristic is required to be substantially identical among the four PRBs. In order to solve this problem, another frequency-dependent code-based solution is proposed, which can alleviate the channel frequency selectivity requirement of the above-mentioned column-based replacement scheme. The scheme based on the frequency correlation code: In the present solution, in step S401, the step of performing the type rotation processing on the OCC on the subcarrier corresponding to the available DMRS antenna 包含 includes: - the subcarrier corresponding to the available DMRS antenna 埠M DMRS OCC rotation patterns using the following formula: among them, Representation vector a diagonal matrix of diagonal elements, , Satisfy ,among them . To further elaborate this scheme, first give a current OCC round transformation sample. and The expression is as follows. (3) Among them, , . The above expression can represent the round transformation used by the current R12 version. For each transmission layer on the antenna, there are different frequency correlation codes. E.g, For the antenna 埠7/13, Corresponds to antenna 埠 8/11. Thus, the transmission power of the first OFDM symbol can be expressed as: (4) Among them, . Investigate the following conditions (5) Obviously, if No special assumptions, Dependent on vector . If the above formula (5) can be satisfied, ie The columns of the matrix are orthogonal to each other, and the use The constant elementality of the element = ,that is, OCC code that does not depend on the time domain . This result is for , and The same is true. In other words, when When there are the same transmission power between the four DMRS symbols in one subframe. The OCC type of this scheme is shown in Figure 3, in order to make Valid, M should be greater than or equal to 4. The following two examples are used to further illustrate the scheme: Example 3 : Preferably, in order to be compatible with the prior user equipment, the OCC pattern on the subcarrier corresponding to 埠7/8 must be consistent with the current R12 type. . Therefore, the first two columns of matrix F must be: . For example, when M=6, the F matrix is set to: . among them, . Using the above F matrix, since the first two columns of the F matrix are identical to the OCC version of the existing R12 version, it can be compatible with the R12 and earlier user devices in the DMRS enhancement technology, and eliminate the OFDM symbol between the DMRSs. Power imbalance problem. Example 4 : When M=9, the F matrix is set to: . among them, . Since only the first column of the above F matrix is the same as the OCC version of the existing R12 version, it can only be compatible with the user equipment of R12 and earlier in the DMRS enhancement technology on the antenna 埠7. 5 shows a method of processing signals in an LTE-based user equipment in accordance with another aspect of the present invention. As shown in FIG. 5, in step S501, the user equipment performs demodulation processing on the OFDM symbols from the base station to obtain the OFDM-demodulated data block; subsequently, in step S502, the user equipment The OCC on the subcarrier corresponding to the available DMRS antenna 中 in the OFDM demodulated data block is inversely processed from the above-described LTE-based base station in the base station according to FIG. That is, in order to solve the power imbalance problem between OFDM symbols existing in the DMRS enhancement technology of the existing LTE protocol, the base station according to the present invention performs type rotation processing on the OCC pattern on the subcarrier corresponding to the available DMRS antenna 埠Then, the data block including the type-rotation processing of the OCC is OFDM-modulated to generate an OFDM symbol for transmission. Correspondingly, the user equipment according to the present invention needs to perform OCC on the subcarrier corresponding to the available DMRS antenna 中 in the OFDM demodulated data block from the base station, and the LTE-based method described above with reference to FIG. The reverse processing of the type rotation in the base station of the agreement can restore the original OCC on the subcarrier corresponding to the available DMRS antenna. Because, for those skilled in the art, it is easy to derive a reverse processing in a known process, so it will not be described here. 6 shows an apparatus for processing a DMRS signal in a base station based on an LTE protocol according to an aspect of the present invention, wherein, as shown in FIG. 4, the method includes: a pattern rotation processing apparatus 601 for using an available DMRS antenna. The OCC on the corresponding subcarrier performs a pattern rotation process to reduce the power imbalance between the OFDM symbols that are subsequently generated; the OFDM modulation device 602 is configured to perform the data block after the type rotation processing of the OCC OFDM modulation is performed to generate OFDM symbols. That is, in order to solve the power imbalance problem between OFDM symbols existing in the DMRS enhancement technology of the existing LTE protocol, the base station according to the present invention performs type rotation processing on the OCC pattern on the subcarrier corresponding to the available DMRS antenna 埠And then performing OFDM modulation on the data block including the pattern rotation processing on the OCC to generate an OFDM symbol. Specifically, the above-described pattern rotation process includes, but is not limited to, a certain degree of transformation of the OCC wheel transformation sample used by the DMRS in the pattern, for example, based on column permutation and frequency dependent code transformation. Two implementations based on column permutation and frequency dependent code conversion are given below. Scheme based on column permutation: In the present scheme, the pattern rotation processing device 601 is specifically configured to: - use M=4 DMRS OCC round transformation samples on the subcarriers corresponding to the available DMRS antennas using the following formula: (1) Among them, a 4×4 permutation matrix, ie Each of the columns is different and is selected from the following collections: , and the following conditions are met: (2). The following is based on the four antennas 埠7/8/11/13 specified in the current LTE protocol for DMRS enhancement. Two examples are used to further illustrate the above scheme based on column permutation: Example 1 : for: Obviously, To satisfy the conditions of the above formula (2), as shown in Fig. 2, the rotation pattern of the OCC is: . Here, as shown in the following formula, it can be easily verified that the transmission power between the DMRS symbols after column replacement in this example is the same. If the number of PRBs is an integer multiple of 4, the rotated DMRS OCC pattern (hereinafter referred to as "OCC pattern") based on this example eliminates the power jitter problem between different symbols. Substituting the above rotated OCC pattern into the original walsh matrix, it can be seen in this example that the 旋转7/8 still maintains the same rotation pattern as the R12 version. , OCC type on 埠11/13 is transformed into: As a preferred solution, since the OCC pattern on the 埠7/8 is unchanged, this example can be compatible with the R12 and earlier user devices in the DMRS enhancement technique. In general, in addition to the example 1, in order to support R12 and earlier user devices in the DMRS enhancement technology, Another limitation of the choice is to ensure that the OCC round transformation of the 埠7/8 is the same as the OCC version specified in the R12 Agreement. Example 2 : In this example, for: Similarly, The condition of formula (2) is also satisfied. The OCC round transformation is: . It can be seen that the above OCC rotation pattern is in the form of a cyclic displacement, and it can be easily verified that the OCC wheel transition sample based on this example also eliminates the power jitter problem between different symbols, and does not change the 埠7/8 defined in R12. The transformation of the round. Since the DMRS enhancement technique has one PRB per OFDM symbol In the case of REs, the method of column permutation can only achieve power equalization in a PRB with an integer multiple of four. This also requires a certain limitation on the channel frequency selectivity, that is, the channel frequency selection characteristic is required to be substantially identical among the four PRBs. In order to solve this problem, another frequency-dependent code-based solution is proposed, which can alleviate the channel frequency selectivity requirement of the above-mentioned column-based replacement scheme. Scheme based on frequency correlation code: In this scheme, the pattern rotation processing 601 is specifically used for: - M DMRS OCC rotation patterns of the following formula will be used on the subcarriers corresponding to the available DMRS antennas: , among them, Representation vector a diagonal matrix of diagonal elements, , Satisfy ,among them . To further elaborate this scheme, first give a current OCC round transformation sample. and The expression is as follows: (3) Among them, , . The above expression can represent the current round of transformations used by R12. There are different frequency correlation codes for the transmission layers on each antenna. E.g, For the antenna 埠7/13, Corresponds to antenna 埠 8/11. Thus, the transmission power of the first OFDM symbol can be expressed as: (4) Among them, . Investigate the following conditions (5) Obviously, if No special assumptions, Dependent on vector . If the above formula (5) can be satisfied, ie The columns of the matrix are orthogonal to each other, and the use The constant elementality of the element = ,that is, OCC code that does not depend on the time domain . This result is for , and The same is true. In other words, when The same transmission power is available between the four DMRS symbols in one subframe. The OCC type of this scheme is shown in Figure 3, in order to make Valid, M should be greater than or equal to 4. The following two examples are used to further illustrate the scheme: Example 3 : Preferably, in order to be compatible with the prior user equipment, the OCC pattern on the subcarrier corresponding to 埠7/8 must be consistent with the current R12 type. . Therefore the first two columns of matrix F must be: . For example, when M=6, the F matrix is set to: , among them, . Using the above F matrix, since the first two columns of the F matrix are the same as the existing DMRS OCC of the R12, it can be compatible with the user equipment of the R12 and earlier versions in the DMRS enhancement technology, and eliminate the OFDM symbol between the DMRSs. Power imbalance problem. Example 4 : When M=9, the F matrix is set to: . among them, . Since only the first column of the above F matrix is the same as the OCC of the existing R12, it can only be compatible with the user equipment of R12 and earlier in the DMRS enhancement technology on the antenna 埠7. 7 shows an apparatus for processing a signal in an LTE-based user equipment according to another aspect of the present invention, wherein, as shown in FIG. 5, an OFDM demodulation apparatus 701 is configured to perform OFDM symbols from a base station. Demodulation processing to obtain an OFDM demodulated data block; a pattern rotation inverse processing device 702, configured to perform OCC on the subcarrier corresponding to the available DMRS antenna 资料 in the OFDM demodulated data block The processing reversed from the pattern rotation processing in the base station based on the LTE protocol described above with reference to FIG. That is, in order to solve the power imbalance problem between OFDM symbols existing in the DMRS enhancement technology of the existing LTE protocol, the base station according to the present invention performs type rotation processing on the OCC pattern on the subcarrier corresponding to the available DMRS antenna 埠Then, the data block including the type-rotation processing of the OCC is OFDM-modulated to generate an OFDM symbol for transmission. Correspondingly, the user equipment according to the present invention needs to perform OCC on the subcarrier corresponding to the available DMRS antenna 中 in the OFDM demodulated data block from the base station, and the LTE-based method described above with reference to FIG. The reverse processing of the type rotation in the base station of the agreement can restore the original OCC on the subcarrier corresponding to the available DMRS antenna. Because, for those skilled in the art, it is easy to derive a reverse processing in a known process, so it will not be described here. It should be noted that the present invention can be implemented in a combination of software and/or software and hardware. For example, each device of the present invention can be implemented by using an application specific integrated circuit (ASIC) or any other similar hardware device. . In one embodiment, the software program of the present invention may be executed by a processor to implement the steps or functions described above. Similarly, the software program of the present invention (including related data structures) can be stored in a computer readable recording medium such as a RAM memory, a disk drive or a CD player or a floppy disk and the like. In addition, some of the steps or functions of the present invention may be implemented in hardware, for example, as a circuit that cooperates with a processor to perform various steps or functions. It is apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be considered as illustrative and not restrictive, and the scope of the invention is defined by the scope of the appended claims rather than the description All changes in the meaning and scope of the equivalents of the scope of the claims are included in the invention. Any reference in the request shall not be considered as a request for limitation. In addition, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. The plurality of units or devices recited in the system claim can also be implemented by a unit or device by software or hardware. The words first, second, etc. are used to denote names and do not denote any particular order. While the exemplifying embodiments have been shown and described, it will be understood by those skilled in the art that the form and details may be varied without departing from the spirit and scope of the invention. The protection sought here is set forth in the scope of the appended claims.

601‧‧‧Model Rotary Treatment Unit
602‧‧‧OFDM modulation device
S401‧‧‧Steps
S402‧‧‧Steps
S501‧‧‧ steps
S502‧‧‧Steps

The invention will be more fully understood from the following detailed description and the appended claims. And in the drawings: FIG. 1 shows an OCC round transition sample in a current scheme according to the LTE R12 protocol; FIG. 2 shows an OCC round transition sample obtained by processing a DMRS signal based on column permutation according to an embodiment of the present invention; 3 shows an OCC round transition sample obtained by processing a DMRS based on a frequency correlation code according to another embodiment of the present invention; FIG. 4 is a flowchart showing a method for processing a DMRS signal in an LTE-based base station according to an aspect of the present invention; Figure 5 shows a flow chart of a method for processing DMRS signals in an LTE-based user equipment according to another aspect of the present invention; Figure 6 shows a device for processing DMRS signals in an LTE-based base station according to an aspect of the present invention; Figure 7 shows a block diagram of a device for processing DMRS signals in an LTE-based user equipment in accordance with another aspect of the present invention; it should be mentioned that such The figures are intended to illustrate the general characteristics of the methods, structures, and/or materials utilized in certain exemplary embodiments, and to supplement the written description provided below. The drawings are not to scale and may not accurately reflect the precise structure or performance characteristics of any given embodiments, and should not be construed as limiting or limiting the scope of the values or attributes covered by the exemplary embodiments. . The use of similar or identical reference numerals in the various figures is intended to indicate the presence of similar or identical elements or features.

S401‧‧‧Steps

S402‧‧‧Steps

Claims (15)

A method for processing a DMRS signal in a base station based on an LTE protocol, wherein the method further comprises: performing a round robin processing on an OCC on a subcarrier corresponding to the available DMRS antenna to perform subsequent OFDMA modulation to reduce subsequent generation The power imbalance between the OFDM symbols. For the method of claim 1, the step of performing the type rotation processing on the OCC on the subcarrier corresponding to the available DMRS antenna includes: M=4 DMRSs are given on the subcarriers corresponding to the available DMRS antennas using the following formula: OCC round transformation sample: Where W is the Walsh matrix a 4×4 permutation matrix, ie Each of the columns is different and is selected from the following collections: , and the following conditions are met: . The method of claim 1, wherein the step of performing the type rotation processing on the OCC on the subcarrier corresponding to the available DMRS antenna comprises: using the M DMRS OCC rotation type of the following formula on the subcarrier corresponding to the available DMRS antenna kind: among them Representation vector a diagonal matrix of diagonal elements; where W is a Walsh matrix: , Satisfy ,among them . The method of any one of claims 1 to 3, wherein the available DMRS antenna 埠 comprises 埠 7, 8, 11 and 13. A method for processing a DMRS signal in an LTE-based user equipment, comprising: performing an OCC on a subcarrier corresponding to an available DMRS antenna 资料 in an OFDM demodulated data block and as in claims 1 to 4 The processing of any type of rotation is reversed. An apparatus for processing a DMRS signal in a base station based on an LTE protocol, wherein before performing OFDMA modulation, the apparatus further includes: a pattern rotation processing apparatus, configured to perform OCC on a subcarrier corresponding to the available DMRS antenna Pattern rotation processing to reduce power imbalance between OFDM symbols that are subsequently generated. The device of claim 6, wherein the pattern rotation processing device is specifically configured to: use the following formula to obtain M=4 DMRS OCC round transition samples on the corresponding subcarriers of the available DMRS antennas: Where W is the Walsh matrix: a 4×4 permutation matrix, ie Each of the columns is different and is selected from the following collections: , and the following conditions are met: . The device of claim 7, wherein for: . The device of claim 7, wherein for: . The device of claim 6, wherein the pattern rotation processing device is specifically configured to: use the M DMRS OCC rotation patterns of the following formula on the subcarriers corresponding to the available DMRS antennas: among them Representation vector a diagonal matrix of diagonal elements; where W is a Walsh matrix: , Satisfy ,among them . The device of claim 10, wherein F satisfies the following conditions: 2 before F is: . The device of claim 10, wherein M is 6, and F satisfies the following conditions: , among them . The device of claim 10, wherein M is 9, and F satisfies the following conditions: , among them . The apparatus of any one of claims 6 to 13, wherein the available DMRS antennas 埠 comprise 埠 7, 8, 11, and 13. An apparatus for processing a DMRS signal in an LTE-based user equipment, comprising: a pattern rotation inverse processing apparatus, configured to perform OCC on a subcarrier corresponding to an available DMRS antenna in an OFDM demodulated data block The processing reversed from the pattern rotation processing according to any one of claims 6 to 14 is performed.