CN106712915B - Method, device, base station and terminal for sending demodulation reference signal - Google Patents

Method, device, base station and terminal for sending demodulation reference signal Download PDF

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CN106712915B
CN106712915B CN201510784170.8A CN201510784170A CN106712915B CN 106712915 B CN106712915 B CN 106712915B CN 201510784170 A CN201510784170 A CN 201510784170A CN 106712915 B CN106712915 B CN 106712915B
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CN106712915A (en
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金婧
吴丹
童辉
沈晓冬
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China Mobile Communications Group Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

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Abstract

The embodiment of the invention provides a method, a device, a base station and a terminal for sending a demodulation reference signal, wherein the method comprises the following steps: carrying out mapping processing on DMRSs sent to a terminal through a demodulation reference signal DMRS port7 and a DMRS port8 by using a first mapping sequence to obtain a first DMRS; performing mapping processing on the DMRS sent to the terminal through the DMRS port11 and the DMRS port13 by using a second mapping sequence to obtain a second DMRS; wherein the first mapping order and the second mapping order are opposite; the first DMRS and/or the second DMRS are/is sent to the terminal, and the embodiment of the invention can ensure backward compatibility and keep the power of orthogonal frequency division multiplexing symbols balanced under the condition of multi-user maximum 8-stream transmission.

Description

Method, device, base station and terminal for sending demodulation reference signal
Technical Field
The present invention relates to the field of wireless technologies, and in particular, to a method, an apparatus, a base station, and a terminal for transmitting a demodulation reference signal.
Background
Existing communication systems, such as Long Term Evolution (LTE), Worldwide Interoperability for Microwave Access (WiMax), and 802.11n, all use conventional 2D Multiple-input Multiple-Output (MIMO) technologies, and the basic principle is to improve transmission quality and system capacity through two-dimensional spatial freedom on a horizontal plane. With the development of antenna design architecture, in order to improve the transmission efficiency of a mobile communication system and improve user experience, the degree of freedom of a vertical space needs to be fully excavated, the conventional 2D MIMO technology is extended to the 3D MIMO technology, and the degree of freedom of a three-dimensional space is fully utilized to improve the system performance.
The antenna architecture of 2D MIMO is to obtain higher antenna gain by adopting multiple elements in the vertical dimension. And each antenna array element in the vertical dimension adopts a fixed weight so as to ensure that a required beam pattern is obtained in the vertical dimension. Thus, 2D MIMO technology has no way to perform beamforming in the vertical dimension.
In order to fully use MIMO technology in the vertical dimension, 3D MIMO can form different beams by controlling the weighting factors of antenna elements in different vertical dimensions. The vertical dimension wave beams can be effectively distinguished, so that the multi-user multiplexing of the vertical dimension is provided, and the capacity is improved. The traditional LTE system supports a maximum design of 8 antennas, and 3D MIMO expands the number of channels of an antenna, and supports a three-dimensional antenna configuration with 16, 32, 64, 128 channels.
The design of demodulation reference signals (DMRS) for Multiple users and Multiple streams (MU-MIMO, Multi-User Multiple-Input Multiple-Output) in the existing standard is as follows:
the existing standard third generation partnership project (3GPP) release 12 supports user multi-streaming as follows: a total of 4 streams (layers), i.e., 2 orthogonal DMRS ports (ports) 7, 8 occupy 12 Resource Elements (REs) with length 2 orthogonal masks (OCC) and two Scrambling codes (Scrambling ID 0, 1).
Wherein, the principle of OCC is: assuming that channels on a plurality of columns (symbols) are unchanged, DMRS sequences are simultaneously transmitted on a plurality of symbols, thereby obtaining diversity gain.
For example: in the OCC-2 design, assuming that channels of Orthogonal Frequency Division Multiplexing (OFDM) symbols #5 and #6 are not changed, DMRS port7 is used with [ +1 [ ]]Transport on symbol #5, #6, port8 utilizing [ + 1-1 [ ]]Transmitted on symbol #5, # 6. Then the OCC decodes as: the channel estimate for DMRS port7 is: s7 H(y5+y6) /2 wherein s7Representing DMRS port7 Signal, y5And y6Representing the signals received by symbol #5 and #6, respectively. The channel estimate for DMRS port8 is: s8 H(y5-y6) /2 wherein s8Indicating a DMRS port8 signal.
For example: in the design with OCC 4, assume OFDM symbols #5, #6, #12, and # 4#13 channel unchanged, DMRSport7 is utilized with [ +1 +1 +1]Transport on symbols #5, #6, #12, and #13, port8 utilizes [ + 1-1]Transport on symbols #5, #6, #12, and #13, port11 utilizes [ +1 + 1-1]Transport on symbols #5, #6, #12, and #13, port13 utilizes [ + 1-1-1 +1]Transmitted on symbols #5, #6, #12 and # 13. Then the OCC decodes as: the channel estimate for dmrport 7 is: s7 H(y5+y6+y12+y13) /2 wherein s7Representing DMRS port7 Signal, y5、y6、y12And y13Respectively, signals received by symbol #5, #6, #12, and # 13.
The resource occupation situation of the DMRS during multi-user pairing in the existing standard is shown in fig. 1, where small squares with "/" and other identifiers in orthogonal frequency division multiplexing symbols #5, #6, #12, and #13 in fig. 1 indicate occupied resources, and resource mapping of the DMRS is shown in table 1.
Figure BDA0000848336780000021
TABLE 1
In the existing standard, the DMRS design for the single-user maximum 8 streams uses OCC ═ 4, occupies 24 REs, and provides completely orthogonal 8-stream transmission, and the specific DMRS resource occupancy is shown in fig. 2, where small squares with "/" and other identifiers in orthogonal frequency division multiplexing symbols #5, #6, #12, and #13 in fig. 2 indicate the occupied resources. And at normal cycle length
Figure BDA0000848336780000022
Is shown in Table 2, wherein
Figure BDA0000848336780000023
Identifying a sequence of ports p, p representing a port, p ═ 7, 8, 9, 10, 11, 12, 13, 14,
Figure BDA0000848336780000024
to represent
Figure BDA0000848336780000025
The first code word of (a) is,
Figure BDA0000848336780000031
to represent
Figure BDA0000848336780000032
The second code word of (a) is,
Figure BDA0000848336780000033
to represent
Figure BDA0000848336780000034
The third code word of (a) is,
Figure BDA0000848336780000035
to represent
Figure BDA0000848336780000036
The fourth codeword of (1).
Figure BDA0000848336780000037
TABLE 2
In conjunction with the standardization progress, one of the DMRS configuration trends in the current standardization discussion is:
DMRSs of terminals (i.e., new terminals) after LTE release 12 use a total of 12 REs, and provide 4 orthogonal DMRS ports using an OCC with a length of 4, an additional scrambling code nSCID is 0, 1 provides quasi-orthogonal transmission of another 4 streams, and supports multi-user transmission of a total of 8 streams, and specific DMRS resource occupancy is shown in fig. 3, where cells with "/" and other identifiers in orthogonal frequency division multiplexing symbols #5, #6, #12 and #13 in fig. 3 indicate occupied resources.
The DMRS design supporting multi-user 8 stream transmission along with the OCC design using the same position in a single-user 8 stream in the existing standard is shown in table 3.
Figure BDA0000848336780000038
TABLE 3
Wherein, OCC adopts the walsh sign indicating number that length is 4 as follows:
Figure BDA0000848336780000041
considering that DMRS also undergoes precoding, assuming that 4 columns of the above walsh code are denoted by a, b, c, d, respectively, and 4 rows denote codewords of port7, 8, 11, 13, respectively, DMRS on the nth antenna is expressed as:
Figure BDA0000848336780000042
wherein wn,k(where k is 1, 2, 3, 4) is the precoding weight corresponding to k stream on the nth antenna if w isn,1＝wn,2＝wn,3＝wn,4Then, the power at OFDM symbols #5, #6, #12, #13 transmitting DMRS REs is expressed as follows:
when the multi-user orthogonal 2 stream adopts ports 7 and 8, the amplitudes on the 4 symbols are 2, 0, 2, and 0, respectively; when single-user orthogonal 8 streams adopt ports 7-14, the amplitudes on 4 symbols are 4, 0, 4 and 0 respectively. Therefore, the power imbalance among the OFDM symbols affects the power efficiency of the transmitting end.
In the existing protocol, in order to deal with the problem of power imbalance, a corresponding solution is proposed:
i.e. let the 4 codewords of the OCC be sequentially adjusted: the even rows have the order a, b, c, d, and the odd rows have the order d, c, b, a. Thus, it can be ensured that the power of 4 OFDM symbols for DMRS transmission is balanced at a granularity of 2 Physical Resource Blocks (PRBs), and the specific codeword allocation is as shown in fig. 4, and the specific amplitude is as shown in fig. 5.
Considering that 3D MIMO introduces more antenna array sub-numbers, and can provide beamforming in both vertical and horizontal dimensions, more paired users can be distinguished. However, the MU-MIMO defined in the existing standard only supports maximum 4 streams, and the DMRS design of maximum 2 streams per user cannot meet the requirement of pairing more users under 3D MIMO.
When multi-user maximum 8-stream transmission is performed, in DMRS configurations implemented by using 12RE, OCC ═ 4, and 2 scrambling code schemes, if the OCC bitmap scheme defined by the existing standard is directly used, there is a problem of power imbalance among OFDM symbols. As shown in fig. 6 to 7, if the first-used OCC bitmap approach is used, when there are 4 orthogonal data streams of multiple users, the power of OFDM symbols 5 and 13 is greater than the power of OFDM symbols 6 and 12, where the 4RE amplitudes of DMRS are 4, 0 and 0, 4, respectively.
Disclosure of Invention
Embodiments of the present invention provide a method, an apparatus, a base station, and a terminal for sending a demodulation reference signal, which can ensure backward compatibility and keep power of orthogonal frequency division multiplexing symbols balanced under the condition of multi-user 8-stream transmission.
In order to achieve the above object, an embodiment of the present invention provides a method for transmitting a demodulation reference signal, which is applied to a base station, and the method includes:
carrying out mapping processing on DMRSs sent to a terminal through a demodulation reference signal DMRS port7 and a DMRS port8 by using a first mapping sequence to obtain a first DMRS;
performing mapping processing on the DMRS sent to the terminal through the DMRS port11 and the DMRS port13 by using a second mapping sequence to obtain a second DMRS; wherein the first mapping order and the second mapping order are opposite;
and transmitting the first DMRS and/or the second DMRS to the terminal.
Before the step of mapping DMRSs transmitted to the terminal through the DMRS ports 11 and 13 using the second mapping order to obtain the second DMRS, the method further includes:
and acquiring a first orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port11, wherein the second mapping sequence is a code word mapping sequence of the first orthogonal mask sequence.
The step of acquiring a first orthogonal mask sequence for mapping a DMRS that is sent to a terminal through a DMRS port11 includes:
by the formula
Figure BDA0000848336780000051
Obtaining a first orthogonal mask sequence, wherein w11(i) Denotes the ith codeword in the first orthogonal mask sequence, i denotes the codeword sequence number, i is 0, 1, 2, 3,
Figure BDA0000848336780000052
Figure BDA0000848336780000053
m ' represents a row number of subcarriers occupied by the DMRS in each physical resource block, m ' ═ 0 represents a row 1 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 1 represents a row 6 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, n ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, and nPRBIndicating the number of physical resource blocks PRB in the whole bandwidth.
Before the step of mapping DMRSs transmitted to the terminal through the DMRS ports 11 and 13 using the second mapping order to obtain the second DMRS, the method further includes:
and acquiring a second orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port13, wherein the second mapping sequence is a code word mapping sequence of the second orthogonal mask sequence.
The step of acquiring a second orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port13 includes:
by the formula
Figure BDA0000848336780000061
Obtaining a second orthogonal mask sequence, wherein w13(i) Denotes the ith codeword in the second orthogonal mask sequence, i denotes the codeword sequence number, i is 0, 1, 2, 3,
Figure BDA0000848336780000062
Figure BDA0000848336780000063
m ' represents a row number of subcarriers occupied by the DMRS in each physical resource block, m ' ═ 0 represents a row 1 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 1 represents a row 6 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, n ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, and nPRBIndicating the number of physical resource blocks PRB in the whole bandwidth.
The embodiment of the invention also provides a device for sending the demodulation reference signal, which is applied to a base station and comprises the following components:
the first mapping module is used for mapping the DMRS which is sent to the terminal through the demodulation reference signal DMRS port7 and the DMRS port8 by using a first mapping sequence to obtain a first DMRS;
the second mapping module is used for mapping the DMRS which is sent to the terminal through the DMRS port11 and the DMRS port13 by using a second mapping sequence to obtain a second DMRS; wherein the first mapping order and the second mapping order are opposite;
and a transmitting module, configured to transmit the first DMRS and/or the second DMRS to a terminal.
Wherein, the device still includes:
the first obtaining module is configured to obtain a first orthogonal mask sequence for mapping a DMRS that is sent to a terminal through a DMRS port11, where a second mapping order is a codeword mapping order of the first orthogonal mask sequence.
Wherein, first acquisition module includes:
a first obtaining unit for obtaining the data by formula
Figure BDA0000848336780000071
Obtaining a first orthogonal mask sequence, wherein w11(i) Denotes the ith codeword in the first orthogonal mask sequence, i denotes the codeword sequence number, i is 0, 1, 2, 3,
Figure BDA0000848336780000072
Figure BDA0000848336780000073
m ' represents a row number of subcarriers occupied by the DMRS in each physical resource block, m ' ═ 0 represents a row 1 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 1 represents a row 6 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, n ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, and nPRBIndicating the number of physical resource blocks PRB in the whole bandwidth.
Wherein, the device still includes:
and a second obtaining module, configured to obtain a second orthogonal mask sequence used for mapping the DMRS sent to the terminal through the DMRS port13, where the second mapping order is a codeword mapping order of the second orthogonal mask sequence.
Wherein, the second acquisition module includes:
a second obtaining unit for obtaining the formula
Figure BDA0000848336780000074
Obtaining a second orthogonal mask sequence, wherein w13(i) Denotes the ith codeword in the second orthogonal mask sequence, i denotes the codeword sequence number, i is 0, 1, 2, 3,
Figure BDA0000848336780000075
Figure BDA0000848336780000076
m ' represents a row number of subcarriers occupied by the DMRS in each physical resource block, m ' ═ 0 represents a row 1 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 1 represents a row 6 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, n ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, and nPRBIndicating the number of physical resource blocks PRB in the whole bandwidth.
The embodiment of the invention also provides a base station which comprises the device for sending the demodulation reference signal.
The embodiment of the invention also provides a method for sending the demodulation reference signal, which is applied to a terminal and comprises the following steps:
receiving a first DMRS which is subjected to first mapping sequence mapping processing and transmitted by a demodulation reference signal DMRS port7 and a DMRS port8 by a base station, and/or receiving a second DMRS which is subjected to second mapping sequence mapping processing and transmitted by a DMRS port11 and a DMRS port13 by the base station; wherein the first mapping order and the second mapping order are opposite;
channel estimation is performed based on the first DMRS and/or the second DMRS.
The embodiment of the invention also provides a device for sending the demodulation reference signal, which is applied to a terminal and comprises the following components:
the base station comprises a receiving module and a transmitting module, wherein the receiving module is used for receiving a first DMRS which is subjected to first mapping sequence mapping processing and is transmitted through a demodulation reference signal DMRS port7 and a DMRS port8, and/or a second DMRS which is subjected to second mapping sequence mapping processing and is transmitted through a DMRS port11 and a DMRS port 13; wherein the first mapping order and the second mapping order are opposite;
and the estimation module is used for carrying out channel estimation according to the first DMRS and/or the second DMRS.
The embodiment of the invention also provides a terminal which comprises the device for sending the demodulation reference signal.
The scheme of the invention at least comprises the following beneficial effects:
in the embodiment of the invention, a first DMRS is obtained by mapping DMRS which are sent to a terminal through a DMRS port7 and a DMRS port8 by using a first mapping sequence, a second DMRS is obtained by mapping DMRS which are sent to the terminal through a DMRS port11 and a DMRS port13 by using a second mapping sequence which is opposite to the first mapping sequence, and the first DMRS and/or the second DMRS are sent to the terminal, so that the problem of unbalanced power of orthogonal frequency division multiplexing symbols under the condition of multi-user maximum 8-stream transmission is solved, and the effect of keeping the balanced power of the orthogonal frequency division multiplexing symbols while ensuring backward compatibility under the condition of multi-user maximum 8-stream transmission is achieved.
Drawings
Fig. 1 is a schematic diagram illustrating resource occupation of a DMRS when a multi-user pairing is performed by using an orthogonal mask with a length of 4 in an existing standard;
fig. 2 is a schematic diagram illustrating resource occupation of a DMRS in a single-user 8-stream transmission performed by using an orthogonal mask with a length of 4 in an existing standard;
fig. 3 is a schematic diagram illustrating resource occupation of a DMRS in multi-user 8-stream transmission using an orthogonal mask with a length of 4 in an existing standard;
fig. 4 is a schematic diagram illustrating codeword allocation in a single-user 8-stream transmission using an orthogonal mask with a length of 4 in the conventional standard;
fig. 5 is a diagram illustrating the amplitude of a single-user 8 stream transmission using a length-4 orthogonal mask in the prior art;
fig. 6 is a schematic diagram illustrating codeword allocation in a multi-user 4-stream transmission using an orthogonal mask with a length of 4 in the conventional standard;
fig. 7 is a diagram illustrating the amplitude of a multi-user 4-stream transmission using a length-4 orthogonal mask in the prior art;
fig. 8 is a flowchart of a method for transmitting a demodulation reference signal according to a first embodiment of the present invention;
fig. 9 is a schematic diagram of code word allocation when DMRS transmitted through DMRS port7 and DMRS port8 performs multi-user 4-stream transmission using an orthogonal mask with a length of 4 in the first embodiment of the present invention;
fig. 10 is a schematic diagram of code word allocation when DMRS transmitted through DMRS ports 11 and 13 performs multi-user 4-stream transmission by using an orthogonal mask with a length of 4 in the first embodiment of the present invention;
fig. 11 is a diagram illustrating the amplitude of a multi-user 4-stream transmission using a length-4 orthogonal mask according to a first embodiment of the present invention;
fig. 12 is a schematic structural diagram of an apparatus for transmitting a demodulation reference signal according to a second embodiment of the present invention;
fig. 13 is a flowchart of a method for transmitting a demodulation reference signal according to a fourth embodiment of the present invention;
fig. 14 is a schematic structural diagram of an apparatus for transmitting a demodulation reference signal according to a fifth embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
First embodiment
As shown in fig. 8, a first embodiment of the present invention provides a method for transmitting a demodulation reference signal, which is applied to a base station, and includes:
step S801 is to perform mapping processing on DMRSs sent to the terminal through the demodulation reference signal port7 and the DMRS port8 using a first mapping order, to obtain a first DMRS.
In the first embodiment of the present invention, an orthogonal mask sequence that maps DMRSs transmitted to a terminal through a demodulation reference signal (DMRS) port7 and a DMRS port8 is the same as an orthogonal mask sequence of an existing standard.
Step S802, a second mapping sequence is used for carrying out mapping processing on the DMRS which is sent to the terminal through the DMRS port11 and the DMRS port13, and a second DMRS is obtained.
Wherein, the first mapping order and the second mapping order are opposite.
In the first embodiment of the present invention, the above step S801 and step S802 have no sequence.
Step S803 is to transmit the first DMRS and/or the second DMRS to the terminal.
In the first embodiment of the present invention, in order to explain the above step S803 in more detail, the terminal is explained here. That is, in the first embodiment of the present invention, a terminal before LTE release 12 (including release 12) is referred to as a legacy terminal (UE), and a terminal after LTE release 12 is referred to as a new UE.
Correspondingly, in the multi-user maximum 8-stream transmission scene, when a new UE and a traditional UE are paired, the base station transmits the DMRS to the traditional UE through the DMRS port7 and the DMRS port8, and transmits the DMRS to the new UE through the DMRS port11 and the DMRS port 13. And the orthogonal mask sequence for mapping the DMRSs transmitted to the legacy UE through the DMRS ports 7 and 8 is the same as the orthogonal mask sequence of the existing standard, so that the power of the OFDM symbols can be kept balanced while backward compatibility is ensured.
However, when there is only pairing between new UEs in a multi-user maximum 8-stream transmission scenario, there is no need to distinguish DMRS ports transmitting DMRSs, because the new UEs can receive and identify DMRSs of DMRS port7, DMRS port8, DMRS port11, and DMRS port 13. In addition, if there is only pairing between the conventional UEs in the multiuser maximum 8-stream transmission scenario, the pairing may be performed according to the existing standard, and therefore details are not repeated here.
In the first embodiment of the present invention, a first DMRS is obtained by mapping DMRSs transmitted to a terminal through DMRS port7 and DMRS port8 using a first mapping order, and a second DMRS is obtained by mapping DMRSs transmitted to the terminal through DMRS port11 and DMRS port13 using a second mapping order that is opposite to the first mapping order, and the first DMRS and/or the second DMRS are transmitted to the terminal, thereby solving a problem that power of an orthogonal frequency division multiplexing symbol is unbalanced in a case of multi-user maximum 8-stream transmission, and achieving an effect of keeping power of the orthogonal frequency division multiplexing symbol balanced while ensuring backward compatibility in a case of multi-user maximum 8-stream transmission.
In the first embodiment of the present invention, before the step S802 is executed, the method further includes: and acquiring a first orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port11, wherein the second mapping sequence is a code word mapping sequence of the first orthogonal mask sequence. In particular, it can be represented by a formula
Figure BDA0000848336780000111
Obtaining a first orthogonal mask sequence, wherein w11(i) Representing the ith codeword in a first orthogonal mask sequence, i tableThe sequence number of the code word, i-0, 1, 2, 3,
Figure BDA0000848336780000112
Figure BDA0000848336780000113
m ' represents a row number of subcarriers occupied by the DMRS in each physical resource block, m ' ═ 0 represents a row 1 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 1 represents a row 6 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, n ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, and nPRBDenotes the number of Physical Resource Blocks (PRBs) in the entire bandwidth.
For the purpose of elaborating on the above w11(i) The expression (b) of (c) is used to assume that, in the existing standard, the codeword mapping order of the orthogonal mask sequence 1 for mapping the DMRS transmitted to the terminal through the dmrport 11 is a, b, c, d (the order is the first mapping order, a, b, c, d respectively represent the codewords of each column of the orthogonal mask sequence 1,
Figure BDA0000848336780000114
Figure BDA0000848336780000115
) Then by w above11(i) The code word mapping order of the first orthogonal mask sequence obtained by calculating the formula is d, c, b, a (the order is the second mapping order). It can be understood that when the mapping order of the code words of the orthogonal mask sequence 1 in the existing standard is d, c, b, a, the above w is passed11(i) And calculating a formula to obtain the mapping sequence of the code words of the first orthogonal mask sequence as a, b, c and d. That is, it is equivalent to exchange the rows corresponding to the code word mapping order of the orthogonal mask sequences of a, b, c, d and d, c, b, a in the conventional standard.
Similarly, before performing the step S802, the method further includes: and acquiring a second orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port13, wherein the second mapping sequence is a code word mapping sequence of the second orthogonal mask sequence. In particular, it can be represented by a formula
Figure BDA0000848336780000116
Obtaining a second orthogonal mask sequence, wherein w13(i) Denotes the ith codeword in the second orthogonal mask sequence, i denotes the codeword sequence number, i is 0, 1, 2, 3,
Figure BDA0000848336780000117
Figure BDA0000848336780000118
m ' represents a row number of subcarriers occupied by the DMRS in each physical resource block, m ' ═ 0 represents a row 1 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 1 represents a row 6 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, n ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, and nRRBDenotes the number of Physical Resource Blocks (PRBs) in the entire bandwidth.
For the purpose of elaborating on the above w13(i) The expression (2) has the function of assuming that the codeword mapping order of the orthogonal mask sequence 2 for mapping the DMRS transmitted to the terminal through the DMRS port13 in the existing standard is a, b, c, d (the order is the first mapping order, a, b, c, d represent codewords of each column of the orthogonal mask sequence 1,
Figure BDA0000848336780000121
Figure BDA0000848336780000122
) Then by w above13(i) The codeword mapping order of the second orthogonal mask sequence obtained by the calculation of the formula is d, c, b, a (this order is the second mapping order). It can be understood that when the mapping order of the code words of the orthogonal mask sequence 2 in the existing standard is d, c, b, a, the above w is passed13(i) And calculating a formula to obtain the mapping sequence of the code words of the second orthogonal mask sequence as a, b, c and d. That is to say that the first and second electrodes,the method is equivalent to exchanging the corresponding lines of the code word mapping sequence of the orthogonal mask sequences of a, b, c, d and d, c, b and a in the existing standard.
Similar to DMRS port11 and DMRS port13, the orthogonal mask sequence 3 for mapping DMRS transmitted to the terminal through DMRS port7 may be represented by formula
Figure BDA0000848336780000123
Is calculated to obtain, wherein, w7(i) Denotes the ith codeword in the orthogonal mask sequence 3, i denotes the codeword sequence number, i is 0, 1, 2, 3,
Figure BDA0000848336780000124
m ' represents a row number of subcarriers occupied by the DMRS in each physical resource block, m ' ═ 0 represents a row 1 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 1 represents a row 6 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, n ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, and nPRBDenotes the number of Physical Resource Blocks (PRBs) in the entire bandwidth.
Similarly, the orthogonal mask sequence 4 for mapping the DMRS transmitted to the terminal through the DMRS port8 may be represented by a formula
Figure BDA0000848336780000125
Is calculated to obtain, wherein, w8(i) Denotes the ith codeword in the orthogonal mask sequence 4, i denotes the codeword sequence number, i is 0, 1, 2, 3,
Figure BDA0000848336780000126
m ' represents a row number of subcarriers occupied by the DMRS in each physical resource block, m ' ═ 0 represents a row 1 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 1 represents a row 6 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, n ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, and nPRBIndicating Physical Resource Blocks (PRBs) over the entire bandwidthThe number in (1).
It should be noted that the orthogonal mask sequence 3 for mapping the DMRS transmitted to the terminal through the DMRS port7 is the same as the orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port7 in the existing standard, and the orthogonal mask sequence 4 for mapping the DMRS transmitted to the terminal through the DMRS port8 is the same as the orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port8 in the existing standard. Therefore, w is not referred to herein7(i) And w8(i) The description is made excessively.
By the above-mentioned w7(i)、w8(i)、w11(i) And w13(i) As can be seen from the formula in (1), in the first embodiment of the present invention, the DMRS transmitted to the terminal through the DMRS port7 and the DMRS port8 is mapped by using a first mapping order (the first mapping order is the same as the mapping order in the existing standard), and the DMRS transmitted to the terminal through the DMRS port11 and the DMRS port13 is mapped by using a second mapping order that is opposite to the first mapping order, so that the effect of keeping the power of the orthogonal frequency division multiplexing symbols balanced while ensuring backward compatibility in the case of multi-user 8 stream transmission is achieved.
In a first embodiment of the present invention, the above method is described as a specific example. As shown in fig. 9, DMRS transmitted to a terminal through DMRS port7 and DMRS port8 is at nPRBThe order of the code words in the 1 st row of the PRB being 1 is d, c, b, a, the order of the code words in the 6 th row is a, b, c, d, and the order of the code words in the 11 th row is d, c, b, a; and in nPRBThe order of the codewords in row 1 of the PRB of 2 is all a, b, c, d, the order of the codewords in row 6 is all d, c, b, a, and the order of the codewords in row 11 is all a, b, c, d. Similarly, as shown in fig. 10, DMRS transmitted to a terminal through DMRS port11 and DMRS port13 is at nPRBThe order of the code words in the 1 st row of the PRB being 1 is a, b, c, d, the order of the code words in the 6 th row is d, c, b, a, and the order of the code words in the 11 th row is a, b, c, d; and in nPRBThe order of the codewords in row 1 of the PRB of 2 is a, b, c, d, and the order of the codewords in row 6 is aD, c, b and a, the code words in the 11 th row are all in a, b, c and d sequence. After such transmission, the amplitudes of the OFDM symbols #5, #6, #12, #13 are made as shown in fig. 11.
Here with nPRBAs can be seen from fig. 9 to 10, the codeword of row 1 of PRB 1 is taken as an example, and n is the codewordPRBIn row 1 of the PRB equal to 1, the codeword of the orthogonal mask sequence 3 that maps the DMRS transmitted to the terminal through the DMRS port7 is: d is 1, c is 1, b is 1, a is 1, and the code word of the orthogonal mask sequence 4 for mapping the DMRS transmitted to the terminal through the DMRS port8 is: d is-1, c is 1, b is-1, and a is 1, and the codeword of the first orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port11 is: a is 1, b is 1, c is-1, and d is-1, and the codeword of the second orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port13 is: a is 1, b is 1, c is 1 and d is 1. Thus, as shown in FIG. 11, at nPRBThe amplitudes of OFDM symbols #5, #6, #12, #13 in row 1 of the PRB which is 1 are 2, -2, respectively.
Similarly, at nPRBIn the 6 th row of the PRB equal to 1, the codeword of the orthogonal mask sequence 3 that maps the DMRS transmitted to the terminal through the DMRS port7 is: a is 1, b is 1, c is 1, d is 1, and the codeword of the orthogonal mask sequence 4 for mapping the DMRS transmitted to the terminal through the DMRS port8 is: a is 1, b is-1, c is 1, d is-1, and the codeword of the first orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port11 is: d is-1, c is-1, b is 1, and a is 1, and the codeword of the second orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port13 is: d is 1, c is 1, b is 1 and a is 1. Thus, as shown in FIG. 11, at nPRBThe amplitudes of OFDM symbols #5, #6, #12, #13 in row 6 of the PRB equal to 1 are 2, -2, respectively.
Similarly, as shown in FIG. 11, at nPRBThe amplitudes of the OFDM symbols #5, #6, #12, #13 in the 11 th row of the PRB of 1 are 2, -2, respectively, and n is nPRBThe amplitudes of the OFDM symbols #5, #6, #12, #13 in row 1 of the PRB equal to 2 are 2, -2, respectively, and n is nPRBRow 6 of PRB 2The OFDM symbols #5, #6, #12, #13 have amplitudes of 2, -2, respectively, at nPRBThe amplitudes of the OFDM symbols #5, #6, #12, #13 in the 11 th row of the PRB equal to 2 are 2, -2, respectively. Therefore, the power of each OFDM symbol is balanced.
Second embodiment
As shown in fig. 12, a second embodiment of the present invention provides an apparatus for transmitting a demodulation reference signal, which is applied to a base station, and includes:
a first mapping module 1201, configured to perform mapping processing on DMRSs sent to a terminal through a demodulation reference signal DMRS port7 and a DMRS port8 by using a first mapping order, to obtain a first DMRS;
a second mapping module 1202, configured to perform mapping processing on the DMRS sent to the terminal through the DMRS port11 and the DMRS port13 by using a second mapping order, to obtain a second DMRS; wherein the first mapping order and the second mapping order are opposite;
a transmitting module 1203 is configured to transmit the first DMRS and/or the second DMRS to a terminal.
Wherein, the device still includes:
the first obtaining module is configured to obtain a first orthogonal mask sequence for mapping a DMRS that is sent to a terminal through a DMRS port11, where a second mapping order is a codeword mapping order of the first orthogonal mask sequence.
Wherein, first acquisition module includes:
a first obtaining unit for obtaining the data by formula
Figure BDA0000848336780000151
Obtaining a first orthogonal mask sequence, wherein w11(i) Denotes the ith codeword in the first orthogonal mask sequence, i denotes the codeword sequence number, i is 0, 1, 2, 3,
Figure BDA0000848336780000152
Figure BDA0000848336780000153
m ' represents a row number of subcarriers occupied by the DMRS in each physical resource block, m ' ═ 0 represents a row 1 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 1 represents a row 6 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, n ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, and nPRBIndicating the number of physical resource blocks PRB in the whole bandwidth.
Wherein, the device still includes:
and a second obtaining module, configured to obtain a second orthogonal mask sequence used for mapping the DMRS sent to the terminal through the DMRS port13, where the second mapping order is a codeword mapping order of the second orthogonal mask sequence.
Wherein, the second acquisition module includes:
a second obtaining unit for obtaining the formula
Figure BDA0000848336780000154
Obtaining a second orthogonal mask sequence, wherein w13(i) Denotes the ith codeword in the second orthogonal mask sequence, i denotes the codeword sequence number, i is 0, 1, 2, 3,
Figure BDA0000848336780000155
Figure BDA0000848336780000156
m ' represents a row number of subcarriers occupied by the DMRS in each physical resource block, m ' ═ 0 represents a row 1 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 1 represents a row 6 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, n ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, and nPRBIndicating the number of physical resource blocks PRB in the whole bandwidth.
In the second embodiment of the present invention, a base station performs mapping processing on DMRSs transmitted to a terminal through a DMRS port7 and a DMRS port8 using a first mapping order to obtain a first DMRS, performs mapping processing on DMRSs transmitted to the terminal through a DMRS port11 and a DMRS port13 using a second mapping order that is opposite to the first mapping order to obtain a second DMRS, and transmits the first DMRS and/or the second DMRS to the terminal, thereby solving a problem that power of an orthogonal frequency division multiplexing symbol is unbalanced in a case of multi-user maximum 8-stream transmission, and achieving an effect of keeping power of the orthogonal frequency division multiplexing symbol balanced while ensuring backward compatibility in a case of multi-user maximum 8-stream transmission.
It should be noted that the apparatus for transmitting a demodulation reference signal according to the second embodiment of the present invention is an apparatus to which the above method for transmitting a demodulation reference signal applied to a base station is applied, that is, all embodiments of the above method for transmitting a demodulation reference signal applied to a base station are applicable to the apparatus, and can achieve the same or similar beneficial effects.
Third embodiment
A third embodiment of the present invention provides a base station including the above apparatus for transmitting a demodulation reference signal.
It should be noted that the base station provided by the third embodiment of the present invention is a base station including the above apparatus for transmitting a demodulation reference signal applied to the base station, that is, all embodiments of the above apparatus for transmitting a demodulation reference signal applied to the base station are applicable to the base station, and can achieve the same or similar beneficial effects.
Fourth embodiment
As shown in fig. 13, a fourth embodiment of the present invention provides a method for transmitting a demodulation reference signal, which is applied to a terminal, wherein the method includes:
and step S1301, receiving a first DMRS which is subjected to first mapping sequence mapping processing and transmitted through a demodulation reference signal DMRS port7 and a DMRS port8 by the base station, and/or receiving a second DMRS which is subjected to second mapping sequence mapping processing and transmitted through a DMRS port11 and a DMRS port13 by the base station.
In a fourth embodiment of the present invention, the first mapping order and the second mapping order are opposite.
In the fourth embodiment of the present invention, in order to explain the above step S1301 in more detail, the terminal is explained here. That is, in the fourth embodiment of the present invention, a terminal before LTE release 12 (including release 12) is referred to as a legacy UE, and a terminal after LTE release 12 is referred to as a new UE. Then, in the multi-user maximum 8-stream transmission scenario, when a new UE and a legacy UE are paired, the new UE receives the DMRS transmitted by the base station through the DMRS port11 and the DMRS port13, and the legacy UE receives the DMRS transmitted by the base station through the DMRS port7 and the DMRS port 8.
However, when there is only pairing between new UEs in the multi-user maximum 8-stream transmission scenario, there is no need to distinguish DMRS ports, because the new UEs can receive and identify DMRSs of DMRS port7, DMRS port8, DMRS port11, and DMRS port 13. In addition, if there is only pairing between the conventional UEs in the multiuser maximum 8-stream transmission scenario, the pairing may be performed according to the existing standard, and therefore details are not repeated here.
And step S1302, performing channel estimation according to the first DMRS and/or the second DMRS.
In the fourth embodiment of the present invention, step S1302 means: after receiving the DMRSs (i.e., the first DMRS and/or the second DMRS), the terminal (new UE or legacy UE) performs channel estimation according to the received DMRSs.
In the fourth embodiment of the present invention, in a multi-user maximum 8-stream transmission scenario, when a new UE and a legacy UE are paired, the new UE receives a DMRS sent by a base station through a DMRS port11 and a DMRS port13, and the legacy UE receives a DMRS sent by the base station through a DMRS port7 and a DMRS port8, so that an effect of keeping power of orthogonal frequency division multiplexing symbols balanced while ensuring backward compatibility is achieved in the multi-user maximum 8-stream transmission scenario.
Fifth embodiment
As shown in fig. 14, a fifth embodiment of the present invention provides an apparatus for transmitting a demodulation reference signal, which is applied to a terminal, and includes:
a receiving module 1401, configured to receive a first DMRS that is subjected to a first mapping sequence mapping process and is transmitted through a demodulation reference signal DMRS port7 and a DMRS port8 by a base station, and/or a second DMRS that is subjected to a second mapping sequence mapping process and is transmitted through a DMRS port11 and a DMRS port13 by the base station; wherein the first mapping order and the second mapping order are opposite;
an estimating module 1402 configured to perform channel estimation according to the first DMRS and/or the second DMRS.
In the fifth embodiment of the present invention, in a multi-user maximum 8-stream transmission scenario, when a new UE and a legacy UE are paired, the new UE receives a DMRS sent by a base station through a DMRS port11 and a DMRS port13, and the legacy UE receives a DMRS sent by the base station through a DMRS port7 and a DMRS port8, so that an effect of keeping power of orthogonal frequency division multiplexing symbols balanced while ensuring backward compatibility is achieved in the multi-user maximum 8-stream transmission scenario.
It should be noted that the apparatus for transmitting a demodulation reference signal according to the fifth embodiment of the present invention is an apparatus to which the above method for transmitting a demodulation reference signal applied to a terminal is applied, that is, all embodiments of the above method for transmitting a demodulation reference signal applied to a terminal are applicable to the apparatus and can achieve the same or similar beneficial effects.
Sixth embodiment
A sixth embodiment of the present invention provides a terminal including the above apparatus for transmitting a demodulation reference signal.
It should be noted that the terminal according to the sixth embodiment of the present invention includes the terminal applied to the apparatus for transmitting a demodulation reference signal of the terminal, that is, all embodiments of the apparatus for transmitting a demodulation reference signal applied to the terminal are applicable to the terminal, and can achieve the same or similar beneficial effects.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (14)

1. A method for transmitting demodulation reference signals, applied to a base station, the method comprising:
carrying out mapping processing on DMRSs sent to a terminal through a demodulation reference signal DMRS port7 and a DMRS port8 by using a first mapping sequence to obtain a first DMRS;
performing mapping processing on the DMRS sent to the terminal through the DMRS port11 and the DMRS port13 by using a second mapping sequence to obtain a second DMRS; wherein the first mapping order and the second mapping order are opposite;
and when the new UE and the traditional UE are paired, correspondingly sending the first DMRS and the second DMRS to the traditional terminal UE and the new terminal UE.
2. The method of claim 1, wherein prior to the step of mapping DMRS transmitted to a terminal through DMRS port11 and DMRS port13 using a second mapping order to obtain a second DMRS, the method further comprises:
and acquiring a first orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port11, wherein the second mapping sequence is a code word mapping sequence of the first orthogonal mask sequence.
3. The method of claim 2, wherein the step of obtaining the first orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port11 comprises:
by the formula
Figure FDA0002359771680000011
Obtaining the first orthogonal mask sequence, wherein the w11(i) Denotes an ith codeword in the first orthogonal mask sequence, i denotes a sequence number of the codeword, i is 0, 1, 2, 3,
Figure FDA0002359771680000012
Figure FDA0002359771680000013
m' represents the row number of the subcarrier occupied by the DMRS in each physical resource block, and m ═ 0 represents the 1 st row subcarrier occupied by the DMRS in each physical resource blockWave, m ═ 1 denotes the 6 th row of subcarriers occupied by the DMRS in each physical resource block, m ═ 2 denotes the 11 th row of subcarriers occupied by the DMRS in each physical resource block, nPRBIndicating the number of physical resource blocks PRB in the whole bandwidth.
4. The method of claim 1, wherein prior to the step of mapping DMRS transmitted to a terminal through DMRS port11 and DMRS port13 using a second mapping order to obtain a second DMRS, the method further comprises:
and acquiring a second orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port13, wherein the second mapping sequence is a code word mapping sequence of the second orthogonal mask sequence.
5. The method of claim 4, wherein the step of obtaining the second orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port13 comprises:
by the formula
Figure FDA0002359771680000021
Obtaining the second orthogonal mask sequence, wherein the w13(i) Denotes an ith codeword in the second orthogonal mask sequence, i denotes a sequence number of the codeword, i is 0, 1, 2, 3,
Figure FDA0002359771680000022
Figure FDA0002359771680000023
m ' represents a row number of subcarriers occupied by the DMRS in each physical resource block, m ' ═ 0 represents a row 1 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 1 represents a row 6 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, n ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, and nPRBIndicating that a physical resource block is PRB-roundedNumber in bandwidth.
6. An apparatus for transmitting a demodulation reference signal, applied to a base station, the apparatus comprising:
the first mapping module is used for mapping the DMRS which is sent to the terminal through the demodulation reference signal DMRS port7 and the DMRS port8 by using a first mapping sequence to obtain a first DMRS;
the second mapping module is used for mapping the DMRS which is sent to the terminal through the DMRS port11 and the DMRS port13 by using a second mapping sequence to obtain a second DMRS; wherein the first mapping order and the second mapping order are opposite;
and the sending module is used for correspondingly sending the first DMRS and the second DMRS to the terminal UE and the new terminal UE when the new UE and the traditional UE are paired.
7. The apparatus of claim 6, further comprising:
a first obtaining module, configured to obtain a first orthogonal mask sequence for mapping a DMRS that is sent to a terminal through a DMRS port11, where the second mapping order is a codeword mapping order of the first orthogonal mask sequence.
8. The apparatus of claim 7, wherein the first obtaining module comprises:
a first obtaining unit for obtaining the data by formula
Figure FDA0002359771680000031
Obtaining the first orthogonal mask sequence, wherein the w11(i) Denotes an ith codeword in the first orthogonal mask sequence, i denotes a sequence number of the codeword, i is 0, 1, 2, 3,
Figure FDA0002359771680000032
Figure FDA0002359771680000033
m ' represents a row number of subcarriers occupied by the DMRS in each physical resource block, m ' ═ 0 represents a row 1 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 1 represents a row 6 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, n ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, and nPRBIndicating the number of physical resource blocks PRB in the whole bandwidth.
9. The apparatus of claim 6, further comprising:
a second obtaining module, configured to obtain a second orthogonal mask sequence for mapping the DMRS sent to the terminal through the DMRS port13, where the second mapping order is a codeword mapping order of the second orthogonal mask sequence.
10. The apparatus of claim 9, wherein the second obtaining module comprises:
a second obtaining unit for obtaining the formula
Figure FDA0002359771680000034
Obtaining the second orthogonal mask sequence, wherein the w13(i) Denotes an ith codeword in the second orthogonal mask sequence, i denotes a sequence number of the codeword, i is 0, 1, 2, 3,
Figure FDA0002359771680000035
Figure FDA0002359771680000036
m 'represents a row number of subcarriers occupied by the DMRS in each physical resource block, m' ═ 0 represents a row 1 subcarrier occupied by the DMRS in each physical resource block, m '═ 1 represents a row 6 subcarrier occupied by the DMRS in each physical resource block, m' ═ 2 represents a row 1 subcarrier occupied by the DMRS in each physical resource blockRow 1 subcarrier, nPRBIndicating the number of physical resource blocks PRB in the whole bandwidth.
11. A base station comprising the apparatus for transmitting a demodulation reference signal according to any one of claims 6 to 10.
12. A method for transmitting a demodulation reference signal, applied to a terminal, the method comprising:
receiving a first DMRS which is subjected to first mapping sequence mapping processing and transmitted by a demodulation reference signal DMRS port7 and a DMRS port8 by a base station, and/or receiving a second DMRS which is subjected to second mapping sequence mapping processing and transmitted by a DMRS port11 and a DMRS port13 by the base station; wherein the first mapping order and the second mapping order are opposite; when the new UE and the traditional UE are paired, the base station transmits DMRS to the traditional UE through the DMRS port7 and the DMRS port8, and transmits DMRS to the new UE through the DMRS port11 and the DMRS port 13;
and performing channel estimation according to the first DMRS and/or the second DMRS.
13. An apparatus for transmitting a demodulation reference signal, applied to a terminal, the apparatus comprising:
the base station comprises a receiving module and a transmitting module, wherein the receiving module is used for receiving a first DMRS which is subjected to first mapping sequence mapping processing and is transmitted through a demodulation reference signal DMRS port7 and a DMRS port8, and/or a second DMRS which is subjected to second mapping sequence mapping processing and is transmitted through a DMRS port11 and a DMRS port 13; wherein the first mapping order and the second mapping order are opposite; when the new UE and the traditional UE are paired, the base station transmits DMRS to the traditional UE through the DMRS port7 and the DMRS port8, and transmits DMRS to the new UE through the DMRS port11 and the DMRS port 13;
and the estimation module is used for carrying out channel estimation according to the first DMRS and/or the second DMRS.
14. A terminal, characterized by comprising the apparatus for transmitting a demodulation reference signal according to claim 13.
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