CN108259145B - Data transmission method, sending device and receiving device - Google Patents

Data transmission method, sending device and receiving device Download PDF

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CN108259145B
CN108259145B CN201611239479.XA CN201611239479A CN108259145B CN 108259145 B CN108259145 B CN 108259145B CN 201611239479 A CN201611239479 A CN 201611239479A CN 108259145 B CN108259145 B CN 108259145B
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dmrs
ptrs
antenna
channel estimation
data stream
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CN108259145A (en
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李辉
高秋彬
苏昕
陈润华
拉盖施
李传军
王蒙军
黄秋萍
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

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Abstract

The invention relates to the technical field of communication, in particular to a data transmission method, a sending device and a receiving device, which comprise: the method comprises the steps that a sending end transmits R data streams to a receiving end on M antenna groups, and S PRTS is sent to the receiving end, wherein each PTRS is transmitted from K antenna groups with the same phase noise in the M antenna groups after being precoded, and M R DMRS are sent to the receiving end, and each DMRS is transmitted from one antenna group after being precoded, wherein the phase noise of antenna ports in the same group is the same.

Description

Data transmission method, sending device and receiving device
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a data transmission method, a transmitting apparatus, and a receiving apparatus.
Background
Phase noise comes from local oscillators in the transmitting device (e.g., transmitter) and the receiving device (e.g., receiver), which will affect the transmission of the multi-carrier signal. In the high frequency band (above 6 GHz), the influence of phase noise will be more serious, and the phase noise compensation needs to be performed on the received signal to ensure the system performance. By introducing a Phase Tracking Reference Signal (PTRS) at the transmitting end, phase changes caused by phase noise can be tracked, ensuring that the receiving end can perform phase noise estimation of a link, and compensating for a received signal.
Since a Long Term Evolution (LTE) system is applied to a low frequency band, there is no corresponding phase tracking reference signal design. In the released 5G protocol, a transmission method of a phase tracking reference signal is proposed, as shown in fig. 1(a) and 1 (b).
Fig. 1(a) shows downlink transmission, where different lines of squares represent different ports, and each port of the phase tracking reference signal occupies one subcarrier and is continuously transmitted in one subframe. The base station informs the user of the port number of the phase tracking reference signal used in transmission through dynamic signaling, and can use 2 ports for transmission, 1 port for transmission or no transmission. Fig. 1(b) shows uplink transmission, p shows port numbers, and each port of the phase tracking reference signal occupies one subcarrier and transmits at intervals in one subframe. The terminal informs the base station of the number of ports of the phase noise compensation signal used in transmission through uplink dynamic signaling, and 1 port or 2 ports can be used. The PTRS is used for transmitting user data similarly to a demodulation reference signal (DMRS), and is transmitted after being precoded. Meanwhile, in the system, each user data stream corresponds to one DMRS port, and is transmitted over a complete antenna array using the same precoding.
In the above scheme, the phase tracking Reference Signal and the Demodulation Reference Signal (DMRS) corresponding to the user data experience the same channel. The phase tracking reference signal is used for calculating the phase difference between the channel estimation on the symbol where the phase tracking reference signal is located and the channel estimation on the symbol where the DMRS is located, so that the phase change caused by the phase noise is obtained and used for channel estimation compensation and data demodulation.
In a multi-antenna transmission/reception system, a transmitting end is constituted by a plurality of antenna elements or antenna ports. If the antenna units or antenna ports have the same phase noise (phase noise caused by the same phase noise source), the above scheme can correctly estimate the phase noise and compensate the influence thereof. However, if the antenna unit or the antenna port at the transmitting end has different phase noises, the channel experienced by the user data will have multiple phase changes at the same time, and the different phase changes caused by the phase noises of each part cannot be estimated by using the above scheme, and thus, the channel estimation compensation and the data demodulation cannot be correctly performed.
In summary, in the prior art, when multiple phase noises exist at an antenna port of a transmitting end, the multiple phase noises cannot be calculated, and thus a receiving end cannot accurately analyze a received data stream.
Disclosure of Invention
The invention provides a data transmission method, a transmitting device and a receiving device, which are used for calculating a plurality of phase noises of a transmitting end, so that a receiving end can correctly analyze received data streams.
In a first aspect, an embodiment of the present invention provides a data transmission method with phase noise compensation capability, including:
the method comprises the steps that a sending end transmits R data streams to a receiving end on M antenna groups, each data stream is transmitted from the M antenna groups after being precoded, phase noises of antenna ports in the same antenna group are the same, and M is a positive integer;
the sending end sends S phase tracking reference signals PTRS to the receiving end, each PTRS is transmitted from K antenna groups in M antenna groups after being precoded, and the K antenna groups have the same phase noise;
the transmitting end transmits M × R DMRSs to the receiving end, and each demodulation reference signal DMRS is transmitted from one antenna group after being precoded;
the PTRS and the DMRS with the corresponding relation are transmitted by using the same antenna group, and each data stream corresponds to M DMRS ports which are respectively transmitted on M different antenna groups.
Optionally, the method further comprises:
the sending end determines a mapping relation between the PTRS and the DMRS and sends the mapping relation to the receiving end through a high-level signaling or a dynamic control signaling; or
And the mapping relation between the PTRS and the DMRS is agreed by the transmitting terminal and the receiving terminal in advance.
Optionally, the method further comprises:
the sending end sends the mapping relation between the data stream and the DMRS to the receiving end through a high-level signaling or a dynamic control signaling; or
And the mapping relation between the data stream and the DMRS is agreed by the transmitting terminal and the receiving terminal in advance.
Optionally, the precoding used by the PTRS is composed of a partial weight in the precoding used by the data stream corresponding to the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located, where the partial weight is a weight corresponding to an antenna group used for transmitting the PTRS.
Optionally, the precoding used by the DMRS is formed by a precoding partial weight used by a data stream corresponding to the DMRS on a subcarrier where the DMRS is located, where the partial weight is a weight corresponding to an antenna group used for transmitting the DMRS.
In a second aspect, an embodiment of the present invention provides a data transmission method with phase noise compensation capability, including:
the receiving end obtains a first channel estimation value corresponding to each DMRS according to M × R DMRSs received by each antenna port and sent by the sending end, wherein the sending end comprises M antenna groups, the phase noise of the antenna ports in the same antenna group is the same, M is a positive integer, R is the number of received data streams, and each DMRS is transmitted from one antenna group after being precoded;
the receiving end obtains a second channel estimation value corresponding to each PTRS according to S PTRSs received by each antenna port and sent by the sending end, wherein each PTRS is transmitted from K antenna groups in the M antenna groups after being precoded, and the K antenna groups have the same phase noise;
the receiving end determines phase change of the antenna group of the transmitting end corresponding to each DMRS on the symbol where the PTRS is located relative to the symbol where the DMRS is located according to the first channel estimation value corresponding to the DMRS, the second channel estimation value corresponding to the PTRS and the mapping relation between the PTRS and the DMRS;
the receiving end determines a channel estimation value corresponding to each data stream in R data streams received on a symbol where the PTRS is located according to the phase change of each antenna group of the transmitting end and the mapping relation between the data streams and the DMRS;
and the receiving end analyzes each data stream according to the determined channel estimation value corresponding to each data stream.
Optionally, determining, by each antenna port of the receiving end, a phase change of the antenna group of the transmitting end corresponding to each DMRS on a symbol where the PTRS is located relative to a symbol where the DMRS is located according to the first channel estimation value corresponding to the DMRS, the second channel estimation value corresponding to the PTRS, and the mapping relationship between the PTRS and the DMRS, includes:
aiming at each PTRS, the receiving end determines a DMRS corresponding to the PTRS according to the mapping relation between the PTRS and the DMRS; determining a first channel estimation value of the DMRS corresponding to the PTRS on a subcarrier where the PTRS is located; and comparing a first channel estimation value of the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located with a second channel estimation value corresponding to the PTRS to obtain the phase change of the antenna group of the transmitting end corresponding to each DMRS on the symbol where the PTRS is located relative to the symbol where the DMRS is located.
Optionally, the receiving end receives the mapping relationship between the PTRS and the DMRS sent by the sending end through a high-level signaling or a dynamic control signaling; or
And the mapping relation between the PTRS and the DMRS is agreed by the transmitting terminal and the receiving terminal in advance.
Optionally, the receiving end receives a mapping relationship between the data stream and the DMRS sent by the sending end through a high-layer signaling or a dynamic control signaling; or
And the mapping relation between the data stream and the DMRS is agreed by the transmitting end and the receiving end in advance.
In a third aspect, an embodiment of the present invention provides a transmitting apparatus, including:
a data stream sending unit, configured to transmit R data streams to a receiving device on M antenna groups, where each data stream is transmitted from the M antenna groups after being precoded, phase noises of antenna ports in the same antenna group are the same, and M is a positive integer;
the PTRS transmitting unit is used for transmitting S PTRSs to the receiving device, each PTRS is transmitted from K antenna groups in the M antenna groups after being precoded, and the K antenna groups have the same phase noise;
and the DMRS transmitting unit is used for transmitting M × R DMRSs to the receiving device, each DMRS is transmitted from one antenna group after being precoded, one PTRS at least corresponds to one DMRS, the PTRS and the DMRS with the corresponding relation use the same antenna group for transmission, and each data stream corresponds to M DMRS ports which are respectively transmitted on M different antenna groups.
Optionally, the transmitting apparatus further includes a mapping relationship transmitting unit, configured to determine a mapping relationship between the PTRS and the DMRS, and transmit the mapping relationship to the receiving apparatus through a high layer signaling or a dynamic control signaling; or
The mapping relationship between the PTRS and the DMRS is agreed in advance by the transmitting apparatus and the receiving apparatus.
Optionally, the method further includes a mapping relation sending unit, configured to send the mapping relation between the data stream and the DMRS to the receiving apparatus through higher layer signaling or dynamic control signaling; or
The mapping relationship between the data streams and the DMRS is agreed in advance by the transmitting apparatus and the receiving apparatus.
Optionally, the precoding used by the PTRS is composed of a partial weight in the precoding used by the data stream corresponding to the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located, where the partial weight is a weight corresponding to an antenna group used for transmitting the PTRS.
Optionally, the precoding used by the DMRS is formed by a precoding partial weight used by a data stream corresponding to the DMRS on a subcarrier where the DMRS is located, where the partial weight is a weight corresponding to an antenna group used for transmitting the DMRS.
In a fourth aspect, an embodiment of the present invention provides a receiving apparatus, including:
the first channel estimation value determining unit is used for obtaining a first channel estimation value corresponding to each DMRS according to M × R DMRSs received by each antenna port and sent by a sending end, wherein the sending end comprises M antenna groups, phase noises of the antenna ports in the same antenna group are the same, M is a positive integer, R is the number of received data streams, and each DMRS is transmitted from one antenna group after being precoded;
a second channel estimation value determining unit, configured to obtain a second channel estimation value corresponding to each PTRS according to S PTRS received by each antenna port and sent by the sending end, where each PTRS is transmitted from K antenna groups of the M antenna groups after being precoded, and the K antenna groups have the same phase noise;
a phase change determining unit, configured to determine, according to the first channel estimation value corresponding to the DMRS, the second channel estimation value corresponding to the PTRS, and a mapping relationship between the PTRS and the DMRS, a phase change of the antenna group of the transmitting end corresponding to each DMRS on a symbol where the PTRS is located relative to a symbol where the DMRS is located;
a channel estimation value determining unit, configured to determine, according to the phase change of each antenna group at the sending end and the mapping relationship between the data streams and the DMRS, a channel estimation value corresponding to each data stream in R data streams received on a symbol where the PTRS is located;
and the analysis unit is used for analyzing each data stream according to the determined channel estimation value corresponding to each data stream.
Optionally, the phase change determining unit is specifically configured to:
aiming at each PTRS, determining a DMRS corresponding to the PTRS according to the mapping relation between the PTRS and the DMRS; determining a first channel estimation value of the DMRS corresponding to the PTRS on a subcarrier where the PTRS is located; and comparing a first channel estimation value of the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located with a second channel estimation value corresponding to the PTRS to obtain the phase change of the antenna group of the transmitting device corresponding to each DMRS on the symbol where the PTRS is located relative to the symbol where the DMRS is located.
Optionally, the receiving apparatus further includes a mapping relationship receiving unit, configured to receive, through a higher layer signaling or a dynamic control signaling, a mapping relationship between a PTRS and a DMRS sent by the sending apparatus; or
The mapping relationship between the PTRS and the DMRS is agreed in advance by the transmitting apparatus and the receiving apparatus.
Optionally, the receiving apparatus further includes a mapping relationship receiving unit, configured to receive, through a higher layer signaling or a dynamic control signaling, a mapping relationship between a data stream and a DMRS, where the data stream is sent by the sending apparatus; or
The mapping relationship between the data stream and the DMRS is agreed in advance by the transmitting device and the receiving device.
In the embodiment of the invention, a sending end transmits R data streams to a receiving end on M antenna groups, and transmits S PRTSs to the receiving end, wherein each PTRS is transmitted from K antenna groups with the same phase noise after being precoded, and transmits M R DMRS to the receiving end, and each DMRS is transmitted from one antenna group after being precoded, wherein the phase noise of antenna ports in the same group is the same, in the embodiment of the invention, each DMRS is transmitted on different antenna groups respectively, and simultaneously each PTRS is transmitted on the antenna groups with the same phase noise respectively, wherein the antenna ports in the same group have the same phase noise, so that the receiving end can calculate the phase noise of each antenna group of the sending end based on the information sent by the sending end, further can perform phase compensation according to the calculated phase noise so as to eliminate the influence of the phase noise, and the accurate transmission of data is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1(a) is a schematic diagram of transmission of a PTRS in a downlink direction according to an embodiment of the present invention;
fig. 1(b) is a schematic diagram of transmission of a PTRS in an uplink direction according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for data transmission according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for data transmission according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a subframe configuration of a reference signal according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a data and reference signal transmission scheme according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a transmitting apparatus according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a receiving apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the invention, a sending end is a terminal, and a receiving end is a base station; or the sending end is a base station and the receiving end is a terminal. That is, the method provided by the embodiment of the present invention is applicable to both uplink transmission and downlink transmission.
In the embodiment of the present invention, a transmitting end has N antenna ports (in practical application, one antenna port may be formed by one or more antenna units), where N is an integer greater than 1, and the N antenna ports of the transmitting end are divided into M groups according to different phase noises, where the antenna ports in the same group have the same phase noise, and the phase noises between the two groups may be the same or different.
For example, assume that the transmitting end has 6 antenna ports (N ═ 6), and the phase noise is:
antenna port 1: phase noise a;
antenna port 2: phase noise b;
antenna port 3: phase noise a;
antenna port 4: phase noise a;
antenna port 5: phase noise b;
antenna port 6: the phase noise a.
There are various ways to group the above 6 ports, which may be, for example:
group 1: { antenna port 1, antenna port 3, antenna port 4, and antenna port 6 };
group 2: { antenna port 2, antenna port 5 }.
Or may be:
group 1: { antenna port 1, antenna port 3 };
group 2: { antenna port 4, antenna port 6 };
group 3: { antenna port 2, antenna port 5 }.
Or may be:
group 1: { antenna port 1, antenna port 3 };
group 2: { antenna port 4 };
group 3: { antenna port 6 };
group 4: { antenna port 2, antenna port 5 }.
Of course, other grouping modes are also possible, as long as the phase noise of the antenna ports in the same group is ensured to be the same, and the phase noise of the antenna ports between the groups may be the same or different.
In the embodiment of the present invention, it is assumed that a sending end sends R data streams to a receiving end, where R is a positive integer.
As shown in fig. 2, a schematic diagram of a data transmission method provided in an embodiment of the present invention, where an execution main body is a sending end, and the sending end is a terminal or a base station, includes:
step 201, a sending end transmits R data streams to a receiving end on M antenna groups, each data stream is transmitted from the M antenna groups after being precoded, phase noises of antenna ports in the same antenna group are the same, and M is a positive integer.
Step 202, the sending end sends S PTRSs to the receiving end, each PTRS is transmitted from K antenna groups of M antenna groups after being precoded, and the K antenna groups have the same phase noise.
And step 203, the transmitting end transmits M × R DMRSs to the receiving end, each DMRS is transmitted from one antenna group after being precoded, wherein one PTRS at least corresponds to one DMRS, the PTRS and the DMRS with the corresponding relation use the same antenna group for transmission, and each data stream corresponds to M DMRS ports which are respectively transmitted on M different antenna groups.
In step 201, the sending end transmits R data streams to the receiving end through the M antenna groups, where each data stream is precoded and then sent to the receiving end through the M antenna groups.
In the above step 202, the transmitting end transmits S PTRSs to the receiving end, where each PTRS is transmitted from K antenna groups after being precoded, and the K antenna groups are antenna groups with the same noise, for example, taking the above example as an illustration, it is assumed that the antennas of the transmitting end are divided into:
group 1: { antenna port 1, antenna port 3 };
group 2: { antenna port 4, antenna port 6 };
group 3: { antenna port 2, antenna port 5 }.
The phase noise of the antenna ports in both group 1 and group 2 is the same, and the phase noise of the antenna ports in group 3 is different from the phase noise of the antenna ports in both group 1 and group 2, and for any of the S PTRSs, the transmission from group 1, the transmission from group 2, the transmission from group 1 and group 2, or the transmission from group 3 is possible.
Optionally, for the precoding used by the PTRS in this step, the precoding used by the data stream corresponding to the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located is composed of a partial weight in the precoding used by the data stream corresponding to the DMRS corresponding to the PTRS, where the partial weight is a weight corresponding to an antenna group used for transmitting the PTRS.
In step 203, the transmitting end transmits M × R DMRSs to the receiving end, and each DMRS is transmitted from one antenna group after being precoded.
That is, each DMRS is sent from M ports to a receiving end, and optionally, precoding used by the DMRS is composed of a precoded partial weight used by a data stream corresponding to the DMRS on a subcarrier where the DMRS is located, where the partial weight is a weight corresponding to an antenna group used for transmitting the DMRS.
The sending end sends the mapping relation between the data stream and the DMRS to the receiving end through a high-level signaling or a dynamic control signaling; or the mapping relation between the data stream and the DMRS is agreed by the sending end and the receiving end in advance; each data stream corresponds to M DMRS ports respectively transmitted on M different antenna groups.
The sending end determines the mapping relation between the PTRS and the DMRS and sends the mapping relation to the receiving end through a high-level signaling or a dynamic control signaling; or the mapping relation between the PTRS and the DMRS is agreed by the sending end and the receiving end in advance; the PTRS and the DMRS with the corresponding relation are transmitted by using the same antenna group, and each data stream corresponds to M DMRS ports which are respectively transmitted on M different antenna groups.
In the embodiment of the invention, a sending end transmits R data streams to a receiving end on M antenna groups, and transmits S PRTSs to the receiving end, wherein each PTRS is transmitted from K antenna groups with the same phase noise after being precoded, and transmits M R DMRS to the receiving end, and each DMRS is transmitted from one antenna group after being precoded, wherein the phase noise of antenna ports in the same group is the same, in the embodiment of the invention, each DMRS is transmitted on different antenna groups respectively, and simultaneously each PTRS is transmitted on the antenna groups with the same phase noise respectively, wherein the antenna ports in the same group have the same phase noise, so that the receiving end can calculate the phase noise of each antenna group of the sending end based on the information sent by the sending end, further can perform phase compensation according to the calculated phase noise so as to eliminate the influence of the phase noise, and the accurate transmission of data is ensured.
As shown in fig. 3, the method for data transmission according to the embodiment of the present invention, in which the execution main body is a receiving end, and the receiving end is a base station or a terminal, includes:
step 301, the receiving end obtains a first channel estimation value corresponding to each DMRS according to M × R DMRSs received by each antenna port and sent by the transmitting end, where the transmitting end includes M antenna groups, the phase noise of the antenna ports in the same antenna group is the same, M is a positive integer, and R is the number of received data streams, and each DMRS is transmitted from one antenna group after being precoded.
Step 302, the receiving end obtains a second channel estimation value corresponding to each PTRS according to S PTRS received by each antenna port and sent by the sending end, wherein each PTRS is transmitted from K antenna groups of the M antenna groups after being precoded, and the K antenna groups have the same phase noise.
And step 303, the receiving end determines the phase change of the antenna group of the transmitting end corresponding to each DMRS on the symbol where the PTRS is located relative to the symbol where the DMRS is located according to the first channel estimation value corresponding to the DMRS, the second channel estimation value corresponding to the PTRS and the mapping relation between the PTRS and the DMRS.
Step 304, the receiving end determines a channel estimation value corresponding to each data stream in the R data streams received on the symbol where the PTRS is located according to the phase change of each antenna group of the transmitting end and the mapping relationship between the data streams and the DMRS.
Step 305, the receiving end analyzes each data stream according to the determined channel estimation value corresponding to each data stream.
The method for transmitting data at the receiving end shown in fig. 3 corresponds to the method for transmitting data at the transmitting end shown in fig. 2, that is, the transmitting end transmits data and a reference signal to the receiving end, and the receiving end performs phase noise adjustment and data analysis according to the received data and the reference signal.
In step 303, optionally, the phase change of the antenna group of the transmitting end corresponding to each DMRS on the symbol where the PTRS is located relative to the symbol where the DMRS is located is determined in the following manner:
for each PTRS, the receiving end performs the following operations:
step 1, determining a DMRS corresponding to the PTRS according to a mapping relation between the PTRS and the DMRS;
step 2, determining a first channel estimation value of a DMRS corresponding to the PTRS on a subcarrier where the PTRS is located;
and 3, comparing the first channel estimation value of the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located with the second channel estimation value corresponding to the PTRS to obtain the phase change of the antenna group of the transmitting end corresponding to each DMRS on the symbol where the PTRS is located relative to the symbol where the DMRS is located.
The receiving end also receives the mapping relation between the PTRS and the DMRS sent by the sending end through a high-level signaling or a dynamic control signaling; or the mapping relation between the PTRS and the DMRS is agreed by the sending end and the receiving end in advance.
The receiving end receives the mapping relation between the data stream and the DMRS sent by the sending end through a high-level signaling or a dynamic control signaling; or the mapping relationship between the data stream and the DMRS is agreed by the transmitting end and the receiving end in advance.
The data transmission method provided by the present invention is explained and explained in detail below with reference to specific embodiments.
Example one
Assuming that the number R of user data streams to be transmitted is 2, the first N1 antenna ports in the antenna array at the transmitting end have the same phase noise and are grouped into one group, and the last N-N1 antenna ports have the same phase noise and are grouped into one group, that is, M is 2, and the phase noise between the two groups is different. The receiving end uses two antenna ports and has different phase noise. The transmitting end uses M × R ═ 4 DMRS ports, and S ═ 2 PTRS ports, where N is the total number of transmitting end antenna ports.
It is assumed that the subframe configuration of the reference signal is as shown in fig. 4. The DMRS is located in a third OFDM symbol, includes 4 ports, and is frequency division multiplexed within the symbol. Each PTRS reference signal occupies one subcarrier (PTRS port 1 is configured on the 8 th subcarrier, and PTRS port 2 is configured on the 7 th subcarrier), and is continuously transmitted on the 4 th to 14 th symbols. The 1 st to 2 nd OFDM signals are control channels, and the rest parts are user data.
It should be noted that, this is only described as an example, and in practical applications, how to configure the positions of the DMRS port and the PTRS port may be determined according to practical needs.
Base station side (taking base station as transmitting end as example):
taking the k-th subcarrier as an example, the precoding matrix used for user data transmission is represented as
Figure GDA0002357766620000131
Wherein the content of the first and second substances,
Figure GDA0002357766620000132
and
Figure GDA0002357766620000133
is N1A x 1 column vector corresponding to the weights used by the first N1 antenna ports in the precoding used for the first and second data streams, respectively.
Figure GDA0002357766620000134
And
Figure GDA0002357766620000135
is (N-N)1) A x 1 column vector corresponding to the weights used by the last N-N1 antenna ports in the precoding used for the first and second data streams, respectively.
As shown in fig. 5, a schematic diagram of a data and reference signal transmission method provided in an embodiment of the present invention is shown, where:
DMRS port 1 is transmitted on the first N1 antenna ports of the transmitting end, and is distributed on subcarriers d1 — 4, 8, and 12. For DMRS1 on subcarrier d1, its use
Figure GDA0002357766620000136
And carrying out precoding.
DMRS port 2 is transmitted on the last N-N1 antenna ports of the transmitting end, and is distributed on subcarriers d2 — 3, 7, and 11. For DMRS2 on subcarrier d2, its use
Figure GDA0002357766620000137
And carrying out precoding.
DMRS port 3 is transmitted on the first N1 antenna ports of the transmitting end, which are distributed on subcarriersd3 is equal to 2, 6, 10. For DMRS3 on subcarrier d3, its use
Figure GDA0002357766620000138
And carrying out precoding.
DMRS port 4 is transmitted on the last N-N1 antenna ports of the transmitting end, and is distributed on subcarriers d4 — 1, 5, 9. For DMRS4 on subcarrier d4, its use
Figure GDA0002357766620000139
And carrying out precoding.
The 2 PTRS ports are used to estimate the phase noise of the antenna ports within the two packets. Wherein PTRS Port 1 uses
Figure GDA00023577666200001310
Precoding, PTRS Port 2 usage
Figure GDA00023577666200001311
And carrying out precoding.
Fig. 5 shows a schematic diagram of transmission, wherein the first data stream is transmitted at N1 antenna ports and N-N1 antenna ports, respectively, and the second data stream is also transmitted at N1 antenna ports and N-N1 antenna ports; DMRS1, DMRS3, and PTRS1 ports transmit on N1 antenna ports, DMRS2, DMRS4, and PTRS2 ports transmit on N-N1 antenna ports.
The base station side maps the PTRS1 to the DMRS1, and the information mapped to the DMRS2 by the PTRS2 is informed to the terminal through high-layer signaling or dynamic control signaling. Meanwhile, the base station side informs the terminal through high-level signaling or dynamic control signaling, the first data stream is mapped to the DMRS port 1 and the DMRS port 2, and the second data stream is mapped to the DMRS port 3 and the DMRS port 4.
Terminal side (taking terminal as receiving end for example):
the data received at the kth subcarrier of the ith OFDM symbol is represented as:
Figure GDA0002357766620000141
further expressed as:
Figure GDA0002357766620000142
wherein a channel H is assumedk,lAnd precoding Wk,lRemain unchanged in one time unit (subframe). On the diagonal of the transmit-side phase noise matrix,
Figure GDA0002357766620000143
there are N1 elements of (a),
Figure GDA0002357766620000144
has N-N1 elements.
And the receiving end receives the DMRS reference signal at the third OFDM symbol. Taking the first receiving antenna port as an example, the DMRS port 1 estimates a composite channel and estimates the composite channel
Figure GDA0002357766620000145
Estimated by DMRS port 2
Figure GDA0002357766620000146
Estimated by DMRS port 3
Figure GDA0002357766620000147
And estimated by DMRS port 4
Figure GDA0002357766620000148
On the symbol where the DMRS is located, the channels of all subcarriers can be estimated by channel interpolation, and according to the assumption in fig. 4, k is 1, 2, …, 12.
The estimated composite channel of each DMRS port is referred to as a first channel estimation value.
The receiving end receives 2-port PTRS from the 4 th OFDM symbol and estimates a composite channel by using a PTRS port 1
Figure GDA0002357766620000149
Estimation of composite channel using PTRS port 2
Figure GDA00023577666200001410
The estimated composite channel of each PTRS port is referred to as a second channel estimation value.
The receiving end receives information that the PTRS1 and the PTRS2 are respectively mapped with the DMRS1 and the DMRS2 one by one, wherein the information is informed by the sending end through signaling. Based on this information, the channel estimation result of the PTRS1 is divided by the channel estimation result of the DMRS1 to obtain the phase change experienced by the first symbol on the first receive antenna port relative to the first group of antenna ports on the transmitting side of the 3 rd symbol, which is expressed as
Figure GDA0002357766620000151
Similarly, according to this information, the channel estimation result of PTRS2 is divided by the channel estimation result of DMRS2 to obtain the phase change experienced by the ith symbol on the first receiving antenna port relative to the second group of antenna ports on the transmitting end of the 3 rd symbol, which is expressed as the phase change
Figure GDA0002357766620000152
And the receiving end receives the information that the first data stream is mapped to the DMRS ports 1 and 2 and the second data stream is mapped to the DMRS ports 3 and 4, which are informed by the sending end through signaling. From this information, channel estimates are derived for the channels experienced by the two data streams on the kth subcarrier of the ith symbol on the first receive antenna or antenna port, denoted as
Channel estimation experienced by the first data stream:
Figure GDA0002357766620000153
channel estimation experienced by the second data stream:
Figure GDA0002357766620000154
similarly, channel estimates for the channels experienced by the two data streams at the second receive antenna port can be derived. Based on the above channel estimation results, demodulation of user data can be achieved.
Other subcarriers can be obtained in the same manner, and are not described in detail.
Example two
Fig. 4 and 5 are also applicable to this second embodiment.
A base station side:
taking the k-th subcarrier as an example, the precoding matrix used for user data transmission is represented as
Figure GDA0002357766620000155
Wherein the content of the first and second substances,
Figure GDA0002357766620000161
and
Figure GDA0002357766620000162
is N1A x 1 column vector corresponding to the weights used by the first N1 antenna ports in the precoding used for the first and second data streams, respectively.
Figure GDA0002357766620000163
And
Figure GDA0002357766620000164
is (N-N)1) A x 1 column vector corresponding to the weights used by the last N-N1 antenna ports in the precoding used for the first and second data streams, respectively.
DMRS port 1 is transmitted on the first N1 antenna ports of the transmitting end, and is distributed on subcarriers d1 — 4, 8, and 12. For DMRS1 on subcarrier d1, its use
Figure GDA0002357766620000165
And carrying out precoding.
DMRS port 2 is transmitted on the last N-N1 antenna ports of the transmitting end, and is distributed on subcarriers d2 — 3, 7, and 11. For subcarrier d2DMRS2, use thereof
Figure GDA0002357766620000166
And carrying out precoding.
DMRS port 3 is transmitted on the first N1 antenna ports of the transmitting end, which are distributed over subcarriers d3 — 2, 6, 10. For DMRS3 on subcarrier d3, its use
Figure GDA0002357766620000167
And carrying out precoding.
DMRS port 4 is transmitted on the last N-N1 antenna ports of the transmitting end, and is distributed on subcarriers d4 — 1, 5, 9. For DMRS4 on subcarrier d4, its use
Figure GDA0002357766620000168
And carrying out precoding.
2 PTRS ports are used to estimate the phase noise of the two parts. Wherein PTRS Port 1 is transmitted on the first N1 antenna ports of the transmitting end, using
Figure GDA0002357766620000169
Precoding, PTRS Port 2 transmitting on the last N-N1 antenna ports of the transmitting end, using
Figure GDA00023577666200001610
And carrying out precoding. Fig. 5 gives a schematic representation of the transmission.
The base station side informs the information of the PTRS1 mapped to the DMRS1 and the DMRS3 and the information of the PTRS2 mapped to the DMRS2 and the DMRS4 to the terminal through high-layer signaling or dynamic control signaling. Meanwhile, the base station side informs the terminal through high-layer signaling or dynamic control signaling, the first data stream is mapped to the DMRS1 and the DMRS2, and the second data stream is mapped to the DMRS3 and the DMRS 4.
A terminal side:
the data received at the kth subcarrier of the ith symbol is represented as:
Figure GDA00023577666200001611
further expressed as:
Figure GDA0002357766620000171
wherein a channel H is assumedk,lAnd precoding Wk,lRemain unchanged in one time unit (subframe). On the diagonal of the transmit-side phase noise matrix,
Figure GDA0002357766620000172
there are N1 elements of (a),
Figure GDA0002357766620000173
has N-N1 elements.
And the receiving end receives the DMRS reference signal at the third OFDM symbol. Taking the first receiving antenna port as an example, the DMRS port 1 estimates a composite channel and estimates the composite channel
Figure GDA0002357766620000174
Estimated by DMRS port 2
Figure GDA0002357766620000175
Estimated by DMRS port 3
Figure GDA0002357766620000176
And estimated by DMRS port 4
Figure GDA0002357766620000177
On the symbol where the DMRS is located, the channels of all subcarriers can be estimated by channel interpolation, and according to the assumption in fig. 4, k is 1, 2, …, 12.
The receiving end receives 2-port PTRS from the 4 th OFDM symbol and estimates the PTRS port 1
Figure GDA0002357766620000178
Estimated using PTRS port 2
Figure GDA0002357766620000179
The terminal side receives the information that the PTRS1 is mapped to the DMRS1 and the DMRS3 and the information that the PTRS2 is mapped to the DMRS2 and the DMRS4, which are informed by the base station side through signaling, and obtains the phase change experienced by the first group of antenna ports of the transmitting end of the ith symbol relative to the 3 rd symbol by adopting the following calculation, wherein the phase change is expressed as:
Figure GDA00023577666200001710
similarly, the phase change experienced by the second group of antenna ports on the transmitting end of the ith symbol relative to the 3 rd symbol is obtained and expressed as:
Figure GDA00023577666200001711
and receiving the information that the first data stream is mapped to the DMRS ports 1 and 2 and the second data stream is mapped to the DMRS ports 3 and 4, which are informed by the base station side through signaling. From this information, channel estimates of the channels experienced by the two data streams on the kth subcarrier of the ith symbol at the first receive antenna or antenna port are derived, which are respectively expressed as:
channel estimation experienced by the first data stream:
Figure GDA0002357766620000181
channel estimation experienced by the second data stream:
Figure GDA0002357766620000182
similarly, channel estimates for the channels experienced by the two data streams at the second receive antenna port can be derived. Based on the above channel estimation results, demodulation of user data can be achieved.
Other subcarriers can be obtained in the same manner, and are not described in detail.
Based on the same inventive concept, an embodiment of the present invention further provides a transmitting apparatus, as shown in fig. 6, where the transmitting apparatus may be integrated inside a terminal or integrated inside a base station, and is configured to enable the terminal or the base station to have a transmitting function, and the transmitting apparatus includes:
a data stream sending unit 601, configured to transmit R data streams to a receiving device on M antenna groups, where each data stream is transmitted from the M antenna groups after being precoded, phase noises of antenna ports in the same antenna group are the same, and M is a positive integer;
a PTRS sending unit 602, configured to send S PTRS to the receiving apparatus, where each PTRS is precoded and then transmitted from K antenna groups of the M antenna groups, where the K antenna groups have the same phase noise;
a DMRS transmitting unit 603, configured to transmit M × R DMRSs to the receiving apparatus, where each DMRS is precoded and then transmitted from one antenna group, where one PTRS at least corresponds to one DMRS, and the PTRS and the DMRS having a corresponding relationship are transmitted by using the same antenna group, and each data stream corresponds to M DMRS ports respectively transmitted on M different antenna groups.
Optionally, the sending apparatus further includes a mapping relationship sending unit 604, configured to determine a mapping relationship between the PTRS and the DMRS, and send the mapping relationship to the receiving apparatus through a higher layer signaling or a dynamic control signaling; or
The mapping relationship between the PTRS and the DMRS is agreed in advance by the transmitting apparatus and the receiving apparatus.
Optionally, the method further includes a mapping relation sending unit 604, configured to send the mapping relation between the data stream and the DMRS to the receiving apparatus through higher layer signaling or dynamic control signaling; or
The mapping relationship between the data streams and the DMRS is agreed in advance by the transmitting apparatus and the receiving apparatus.
Optionally, the precoding used by the PTRS is composed of a partial weight in the precoding used by the data stream corresponding to the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located, where the partial weight is a weight corresponding to an antenna group used for transmitting the PTRS.
Optionally, the precoding used by the DMRS is formed by a precoding partial weight used by a data stream corresponding to the DMRS on a subcarrier where the DMRS is located, where the partial weight is a weight corresponding to an antenna group used for transmitting the DMRS.
Based on the same inventive concept, an embodiment of the present invention provides a receiving apparatus, as shown in fig. 7, including:
a first channel estimation value determining unit 701, configured to obtain a first channel estimation value corresponding to each DMRS according to M × R DMRSs received by each antenna port and sent by a sending end, where the sending end includes M antenna groups, phase noises of antenna ports in the same antenna group are the same, M is a positive integer, and R is the number of received data streams, and each DMRS is transmitted from one antenna group after being precoded;
a second channel estimation value determining unit 702, configured to obtain, according to the S PTRS received by each antenna port and sent by the sending end, a second channel estimation value corresponding to each PTRS, where each PTRS is transmitted from K antenna groups of the M antenna groups after being precoded, and the K antenna groups have the same phase noise;
a phase change determining unit 703, configured to determine, according to the first channel estimation value corresponding to the DMRS, the second channel estimation value corresponding to the PTRS, and the mapping relationship between the PTRS and the DMRS, a phase change, on a symbol where the PTRS is located, of an antenna group of the transmitting end corresponding to each DMRS relative to a symbol where the DMRS is located;
a channel estimation value determining unit 704, configured to determine, according to the phase change of each antenna group of the sending end and the mapping relationship between the data stream and the DMRS, a channel estimation value corresponding to each data stream of R data streams received on a symbol where the PTRS is located;
analyzing unit 705 is configured to analyze each data stream according to the determined channel estimation value corresponding to each data stream.
Optionally, the phase change determining unit 703 is specifically configured to:
aiming at each PTRS, determining a DMRS corresponding to the PTRS according to the mapping relation between the PTRS and the DMRS; determining a first channel estimation value of the DMRS corresponding to the PTRS on a subcarrier where the PTRS is located; and comparing a first channel estimation value of the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located with a second channel estimation value corresponding to the PTRS to obtain the phase change of the antenna group of the transmitting device corresponding to each DMRS on the symbol where the PTRS is located relative to the symbol where the DMRS is located.
Optionally, the receiving apparatus further includes a mapping relation receiving unit 706, configured to receive, through a higher layer signaling or a dynamic control signaling, a mapping relation between the PTRS and the DMRS sent by the sending apparatus; or
The mapping relationship between the PTRS and the DMRS is agreed in advance by the transmitting apparatus and the receiving apparatus.
Optionally, the receiving apparatus further includes a mapping relation receiving unit 706, configured to receive, through higher layer signaling or dynamic control signaling, a mapping relation between a data stream and a DMRS sent by the sending apparatus; or
The mapping relationship between the data stream and the DMRS is agreed in advance by the transmitting device and the receiving device.
In the embodiment of the invention, a sending end transmits R data streams to a receiving end on M antenna groups, and transmits S PRTSs to the receiving end, wherein each PTRS is transmitted from K antenna groups with the same phase noise after being precoded, and transmits M R DMRS to the receiving end, and each DMRS is transmitted from one antenna group after being precoded, wherein the phase noise of antenna ports in the same group is the same, in the embodiment of the invention, each DMRS is transmitted on different antenna groups respectively, and simultaneously each PTRS is transmitted on the antenna groups with the same phase noise respectively, wherein the antenna ports in the same group have the same phase noise, so that the receiving end can calculate the phase noise of each antenna group of the sending end based on the information sent by the sending end, further can perform phase compensation according to the calculated phase noise so as to eliminate the influence of the phase noise, and the accurate transmission of data is ensured.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (18)

1. A method of data transmission, comprising:
the method comprises the steps that a sending end transmits R data streams to a receiving end on M antenna groups, each data stream is transmitted from the M antenna groups after being precoded, phase noises of antenna ports in the same antenna group are the same, and M is a positive integer;
the sending end sends S phase tracking reference signals PTRS to the receiving end, each PTRS is transmitted from K antenna groups in M antenna groups after being precoded, and the K antenna groups have the same phase noise;
the transmitting end transmits M-R demodulation reference signals DMRS to the receiving end, and each DMRS is transmitted from one antenna group after being precoded;
the PTRS and the DMRS with the corresponding relation are transmitted by using the same antenna group, and each data stream corresponds to M DMRS ports which are respectively transmitted on M different antenna groups.
2. The data transmission method of claim 1, further comprising:
the sending end determines a mapping relation between the PTRS and the DMRS and sends the mapping relation to the receiving end through a high-level signaling or a dynamic control signaling; or
And the mapping relation between the PTRS and the DMRS is agreed by the transmitting terminal and the receiving terminal in advance.
3. The data transmission method of claim 1, further comprising:
the sending end sends the mapping relation between the data stream and the DMRS to the receiving end through a high-level signaling or a dynamic control signaling; or
And the mapping relation between the data stream and the DMRS is agreed by the transmitting terminal and the receiving terminal in advance.
4. The data transmission method according to claim 1, wherein the precoding used by the PTRS is composed of a part of weights in the precoding used by the data stream corresponding to the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located, and the part of weights are weights corresponding to the antenna group used for transmitting the PTRS.
5. The data transmission method according to claim 1, wherein the precoding used by the DMRS is formed by a partial weight of the precoding used by the data stream corresponding to the DMRS on the subcarrier where the DMRS is located, and the partial weight is a weight corresponding to the antenna group used for transmitting the DMRS.
6. A method of data transmission, comprising:
the receiving end obtains a first channel estimation value corresponding to each DMRS according to M × R demodulation reference signals (DMRS) received by each antenna port and sent by the sending end, wherein the sending end comprises M antenna groups, the phase noises of the antenna ports in the same antenna group are the same, M is a positive integer, R is the number of received data streams, and each DMRS is transmitted from one antenna group after being precoded;
the receiving end obtains a second channel estimation value corresponding to each PTRS according to S phase tracking reference signals PTRS received by each antenna port and sent by the sending end, wherein each PTRS is transmitted from K antenna groups in M antenna groups after being precoded, and the K antenna groups have the same phase noise;
the receiving end determines phase change of the antenna group of the transmitting end corresponding to each DMRS on the symbol where the PTRS is located relative to the symbol where the DMRS is located according to the first channel estimation value corresponding to the DMRS, the second channel estimation value corresponding to the PTRS and the mapping relation between the PTRS and the DMRS;
the receiving end determines a channel estimation value corresponding to each data stream in R data streams received on a symbol where the PTRS is located according to the phase change of each antenna group of the transmitting end and the mapping relation between the data streams and the DMRS;
and the receiving end analyzes each data stream according to the determined channel estimation value corresponding to each data stream.
7. The data transmission method according to claim 6, wherein the determining, by the receiving end, the phase change of the antenna group of the transmitting end corresponding to each DMRS on the symbol on which the PTRS is located relative to the symbol on which the DMRS is located according to the first channel estimation value corresponding to the DMRS, the second channel estimation value corresponding to the PTRS, and the mapping relationship between the PTRS and the DMRS, comprises:
aiming at each PTRS, the receiving end determines a DMRS corresponding to the PTRS according to the mapping relation between the PTRS and the DMRS; determining a first channel estimation value of the DMRS corresponding to the PTRS on a subcarrier where the PTRS is located; and comparing a first channel estimation value of the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located with a second channel estimation value corresponding to the PTRS to obtain the phase change of the antenna group of the transmitting end corresponding to each DMRS on the symbol where the PTRS is located relative to the symbol where the DMRS is located.
8. The data transmission method according to claim 6, wherein the receiving end receives the mapping relationship between the PTRS and the DMRS transmitted by the transmitting end through a higher layer signaling or a dynamic control signaling; or
And the mapping relation between the PTRS and the DMRS is agreed by the transmitting terminal and the receiving terminal in advance.
9. The data transmission method according to claim 6, wherein the receiving end receives the mapping relationship between the data stream and the DMRS sent by the sending end through a higher layer signaling or a dynamic control signaling; or
And the mapping relation between the data stream and the DMRS is agreed by the transmitting end and the receiving end in advance.
10. A transmitting apparatus, comprising:
a data stream sending unit, configured to transmit R data streams to a receiving device on M antenna groups, where each data stream is transmitted from the M antenna groups after being precoded, phase noises of antenna ports in the same antenna group are the same, and M is a positive integer;
a phase tracking reference signal PTRS sending unit, configured to send S PTRSs to the receiving apparatus, where each PTRS is precoded and then transmitted from K antenna groups of the M antenna groups, and the K antenna groups have the same phase noise;
and the demodulation reference signal DMRS sending unit is used for sending M × R DMRSs to the receiving device, and each DMRS is transmitted from one antenna group after being precoded, wherein one PTRS at least corresponds to one DMRS, the PTRS and the DMRS with the corresponding relation are transmitted by using the same antenna group, and each data stream corresponds to M DMRS ports which are respectively transmitted on M different antenna groups.
11. The transmission apparatus according to claim 10, wherein the transmission apparatus further comprises a mapping relation transmission unit configured to determine a mapping relation between the PTRS and the DMRS, and transmit the mapping relation to the reception apparatus through higher layer signaling or dynamic control signaling; or
The mapping relationship between the PTRS and the DMRS is agreed in advance by the transmitting apparatus and the receiving apparatus.
12. The transmission apparatus according to claim 10, wherein the transmission apparatus further comprises a mapping relation transmission unit configured to transmit a mapping relation between the data stream and the DMRS to the reception apparatus through higher layer signaling or dynamic control signaling; or
The mapping relationship between the data streams and the DMRS is agreed in advance by the transmitting apparatus and the receiving apparatus.
13. The transmitter according to claim 10, wherein the precoding used by the PTRS is composed of a part of weights in the precoding used by the data stream corresponding to the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located, and the part of weights are weights corresponding to the antenna group used for transmitting the PTRS.
14. The transmitter according to claim 10, wherein the precoding used by the DMRS is formed by a partial weight of the precoding used by the data stream corresponding to the DMRS on the subcarrier where the DMRS is located, and the partial weight is a weight corresponding to an antenna group used for transmitting the DMRS.
15. A receiving apparatus, comprising:
the first channel estimation value determining unit is used for obtaining a first channel estimation value corresponding to each DMRS according to M × R demodulation reference signals (DMRS) received by each antenna port and sent by a sending end, wherein the sending end comprises M antenna groups, the phase noise of the antenna ports in the same antenna group is the same, M is a positive integer, R is the number of received data streams, and each DMRS is transmitted from one antenna group after being precoded;
a second channel estimation value determining unit, configured to obtain a second channel estimation value corresponding to each PTRS according to S phase tracking reference signals PTRS received by each antenna port and sent by the sending end, where each PTRS is transmitted from K antenna groups of M antenna groups after being precoded, and the K antenna groups have the same phase noise;
a phase change determining unit, configured to determine, according to the first channel estimation value corresponding to the DMRS, the second channel estimation value corresponding to the PTRS, and a mapping relationship between the PTRS and the DMRS, a phase change of the antenna group of the transmitting end corresponding to each DMRS on a symbol where the PTRS is located relative to a symbol where the DMRS is located;
a channel estimation value determining unit, configured to determine, according to the phase change of each antenna group at the sending end and the mapping relationship between the data streams and the DMRS, a channel estimation value corresponding to each data stream in R data streams received on a symbol where the PTRS is located;
and the analysis unit is used for analyzing each data stream according to the determined channel estimation value corresponding to each data stream.
16. The receiving apparatus according to claim 15, wherein the phase change determining unit is specifically configured to:
aiming at each PTRS, determining a DMRS corresponding to the PTRS according to the mapping relation between the PTRS and the DMRS; determining a first channel estimation value of the DMRS corresponding to the PTRS on a subcarrier where the PTRS is located; and comparing a first channel estimation value of the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located with a second channel estimation value corresponding to the PTRS to obtain the phase change of the antenna group of the transmitting end corresponding to each DMRS on the symbol where the PTRS is located relative to the symbol where the DMRS is located.
17. The receiving apparatus according to claim 15, wherein the receiving apparatus further comprises a mapping relation receiving unit, configured to receive, through higher layer signaling or dynamic control signaling, a mapping relation between the PTRS and the DMRS sent by the sending end; or
The mapping relationship between the PTRS and the DMRS is agreed by the transmitting terminal and the receiving device in advance.
18. The receiving apparatus according to claim 15, wherein the receiving apparatus further comprises a mapping relation receiving unit, configured to receive, through higher layer signaling or dynamic control signaling, a mapping relation between the data stream transmitted by the transmitting end and the DMRS; or
And the mapping relation between the data stream and the DMRS is agreed in advance by the transmitting terminal and the receiving device.
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