CN107888250B - Transmission method, estimation method and communication equipment of phase noise compensation reference signal - Google Patents

Transmission method, estimation method and communication equipment of phase noise compensation reference signal Download PDF

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CN107888250B
CN107888250B CN201610873942.XA CN201610873942A CN107888250B CN 107888250 B CN107888250 B CN 107888250B CN 201610873942 A CN201610873942 A CN 201610873942A CN 107888250 B CN107888250 B CN 107888250B
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reference signal
phase noise
noise compensation
precoding matrix
transmitting
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CN107888250A (en
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李辉
高秋彬
陈润华
苏昕
塔玛拉卡·拉盖施
王蒙军
李传军
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
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/084—Equal gain combining, only phase adjustments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion

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Abstract

The invention provides a transmission method, an estimation method and communication equipment of a phase noise compensation reference signal, wherein the transmission method of the phase noise compensation reference signal comprises the following steps: determining N phase noise compensation reference signals, wherein each phase noise compensation reference signal corresponds to a reference signal port, each phase noise compensation reference signal corresponds to one or more transmitting antennas or antenna ports, and the number of the transmitting antennas or antenna ports is Nt，N≤Nt(ii) a Precoding a data stream to be transmitted and a demodulation reference signal corresponding to the data stream to obtain a precoded data stream and a demodulation reference signal, and mapping the precoded data stream and the demodulation reference signal to NtTransmitting on a single transmit antenna or antenna port, and mapping N phase noise compensated reference signals to NtTransmitting on a transmitting antenna or antenna port; and informing the receiving end of the precoding matrix information adopted by precoding. The scheme of the invention can accurately estimate the phase noise of each receiving and transmitting radio frequency channel.

Description

Transmission method, estimation method and communication equipment of phase noise compensation reference signal
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a transmission method of a phase noise compensation reference signal, a phase noise estimation method, a transmitter, a receiver, and a communication device.
Background
The phase noise comes from local oscillators in the transmitter and the 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 the phase noise compensation reference signal into the transmitting end, the receiving end can be ensured to carry out phase noise estimation of a link and compensate the received signal.
Since an LTE (Long Term Evolution) system is applied to a low frequency band, there is no corresponding phase noise compensation reference signal design. In the 5G protocol published by Verizon, a method for transmitting a phase noise compensation reference signal is proposed, as shown in fig. 1 and 2. Fig. 1 is a schematic time-Frequency position diagram of a phase noise compensation reference signal for downlink transmission, fig. 2 is a schematic time-Frequency position diagram of a phase noise compensation reference signal for uplink transmission, in fig. 1 and fig. 2, the number of the abscissa is the number of an OFDM (Orthogonal Frequency Division Multiplexing) symbol, the number of the ordinate is the number of a subcarrier, p represents a port number, and squares with different filling stripes represent different ports. As can be seen from fig. 1, in downlink transmission, each port of the phase noise compensation 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 noise compensation reference signal used in transmission through dynamic signaling, and can use 2 ports for transmission, 1 port for transmission or no transmission. As can be seen from fig. 2, each port of the phase noise compensation reference signal occupies one subcarrier and is transmitted at intervals in one subframe. The user 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 phase noise compensation Reference Signal is similar to a Demodulation Reference Signal (DMRS), and is used when user data is transmitted, and needs to be transmitted after being precoded.
In the multi-antenna transceiving system, a plurality of transceiving radio frequency channels exist at a transmitting end and a receiving end. For OFDM multi-carrier communications, in the presence of phase noise, the transmission of user data is described by:
Figure BDA0001124760640000021
where the subscripts k, l denote the kth subcarrier of the l symbol, Yk,lTo receive a signal, it is one NrX 1 column vector, NrIs the number of receive antennas;
Figure BDA0001124760640000027
is the phase noise of the receiver, which is one Nr×NrA diagonal matrix, each element representing phase noise on one receive antenna; hk,lIs one Nr×NtChannel matrix of, NtThe number of transmitting antennas;
Figure BDA0001124760640000028
is the phase noise of the transmitter, which is one Nt×NtA diagonal matrix, each element representing phase noise on one transmit antenna; wk,lIs Nt×NsOf the precoding matrix, Xk,lFor transmitting a signal, it is one NsX 1 column vector, representing NsThe data streams are transmitted in parallel. Further, the phase noise matrix may be expressed as:
Figure BDA0001124760640000022
in general, assume channel Hk,lAnd precoding Wk,lRemains unchanged in one subframe. Only the phase noise changes every symbol of the subframe. In the above scheme, the phase noise compensation reference signal is precoded Wk,lTransmitting for estimating a composite channel
Figure BDA0001124760640000023
The channel of (2) is changed. When the phase noise on each antenna is the same, i.e. at the transmitting and receiving ends
Figure BDA0001124760640000024
And is
Figure BDA0001124760640000025
Then, the scheme can accurately estimate the channel variation. If the phase noise of different antennas at the transmitting end or the receiving end is different, the phase noise is caused by the fact that
Figure BDA0001124760640000026
The elements in the channel estimation method have different phase changes, and the phase noise compensation reference signal after precoding cannot obtain the phase noise of each receiving and transmitting radio frequency channel, so that the channel change of the composite channel cannot be accurately estimated.
Disclosure of Invention
In view of the above, the present invention provides a phase noise compensation reference signal transmission method, a phase noise estimation method, a transmitter, a receiver, and a communication device, so as to solve the problem that it is difficult to accurately estimate the phase noise of each transceiving rf channel by using the existing phase noise compensation reference signal transmission method.
To solve the above technical problem, the present invention provides a method for transmitting a phase noise compensation reference signal, including:
determining N phase noise compensation reference signals, wherein each phase noise compensation reference signal corresponds to a reference signal port, each phase noise compensation reference signal corresponds to one or more transmitting antennas or antenna ports, and the number of the transmitting antennas or antenna ports is Nt，N≤NtN and NtAre all positive integers;
pre-coding a data stream to be transmitted and a demodulation reference signal corresponding to the data stream to obtain a pre-coded data stream and a demodulation reference signal, and mapping the pre-coded data stream and the demodulation reference signal to the NtTransmitting on a plurality of transmit antennas or antenna ports, and mapping the N phase noise compensated reference signals to the N phase noise compensated reference signalstTransmitting on a transmitting antenna or antenna port;
and informing the receiving end of the precoding matrix information adopted by precoding.
Preferably, the transmitting antennas with the same phase noise share the same reference signal port.
Preferably, the N phase noise compensation reference signals are mapped to the NtThe step of transmitting on each transmit antenna or antenna port comprises:
when N is equal to NtWhen the N phase noise compensation reference signals are received, mapping the N phase noise compensation reference signals to each corresponding transmitting antenna or antenna port one by one for transmission;
when N is less than NtAnd mapping the phase noise compensation reference signal of the same reference signal port shared by a plurality of transmitting antennas or antenna ports to the plurality of transmitting antennas or antenna ports for transmission.
Preferably, the precoded data stream and demodulation reference signal are mapped to said NtWhen transmission is carried out on each transmitting antenna or antenna port, N is adopted as the precoded demodulation reference signalsA reference signal port, wherein NsIs the number of data streams.
Preferably, the precoding matrix information is index information of the precoding matrix in a codebook predefined by the system, or is a numerical value of each element of the precoding matrix.
The invention also provides a phase noise estimation method, which comprises the following steps:
receiving a phase noise compensation reference signal, precoding matrix information, a precoded data stream and a demodulation reference signal which are sent by a transmitting terminal;
estimating the synthesized channel information of the symbol where the demodulation reference signal is located by using the demodulation reference signal;
estimating channel information of a symbol where the phase noise compensation reference signal is located by using the phase noise compensation reference signal, and obtaining synthetic channel information of the symbol where the phase noise compensation reference signal is located according to the channel information and precoding matrix information;
and comparing the synthesized channel information of the symbol where the phase noise compensation reference signal is located with the synthesized channel information of the symbol where the demodulation reference signal is located to obtain the phase change of the symbol where the phase noise compensation reference signal is located relative to the symbol where the demodulation reference signal is located.
Preferably, the step of obtaining the synthesized channel information of the symbol where the phase noise compensation reference signal is located according to the channel information and the precoding matrix information includes:
obtaining a precoding matrix according to the precoding matrix information;
and multiplying the channel information by the precoding matrix to obtain the synthesized channel information of the symbol where the phase noise compensation reference signal is located.
Preferably, the precoding matrix information is index information of the precoding matrix in a codebook predefined by the system, or is a numerical value of each element of the precoding matrix.
The present invention also provides a transmitter comprising:
a determining unit, configured to determine N phase noise compensation reference signals, where each phase noise compensation reference signal corresponds to a reference signal port, and each phase noise compensation reference signal corresponds to one or more transmitting antennas or antenna ports, where the number of the transmitting antennas or antenna ports is Nt，N≤NtN and NtAre all positive integers;
a transmission unit, configured to pre-code a data stream to be sent and a demodulation reference signal corresponding to the data stream to obtain a pre-coded data stream and a demodulation reference signal, and map the pre-coded data stream and the demodulation reference signal to the NtTransmitting on a plurality of transmit antennas or antenna ports, and mapping the N phase noise compensated reference signals to the N phase noise compensated reference signalstTransmitting on a transmitting antenna or antenna port;
and the informing unit is used for informing the receiving end of the precoding matrix information adopted by the precoding.
Preferably, the transmitting antennas with the same phase noise share the same reference signal port.
Preferably, the transmission unit includes:
a first mapping subunit for mapping when N is equal to NtWhen the N phase noise compensation reference signals are received, mapping the N phase noise compensation reference signals to each corresponding transmitting antenna or antenna port one by one for transmission;
a second mapping subunit for, when N is less than NtAnd mapping the phase noise compensation reference signal of the same reference signal port shared by a plurality of transmitting antennas or antenna ports to the plurality of transmitting antennas or antenna ports for transmission.
Preferably, the transmission unit maps the precoded data stream and demodulation reference signal to the NtWhen transmission is carried out on each transmitting antenna or antenna port, N is adopted as the precoded demodulation reference signalsA reference signal port, wherein NsIs the number of data streams.
Preferably, the precoding matrix information is index information of the precoding matrix in a codebook predefined by the system, or is a numerical value of each element of the precoding matrix.
The present invention also provides a receiver comprising:
the receiving unit is used for receiving the phase noise compensation reference signal, the precoding matrix information, the precoded data stream and the demodulation reference signal which are sent by the transmitting terminal;
a first estimating unit, configured to estimate, by using the demodulation reference signal, synthesized channel information of a symbol where the demodulation reference signal is located;
the second estimation unit is used for estimating the channel information of the symbol where the phase noise compensation reference signal is located by utilizing the phase noise compensation reference signal;
a third estimating unit, configured to obtain, according to the channel information and the precoding matrix information, synthesized channel information of a symbol where the phase noise compensation reference signal is located;
and the comparison unit is used for comparing the synthesized channel information of the symbol where the phase noise compensation reference signal is located with the synthesized channel information of the symbol where the demodulation reference signal is located to obtain the phase change of the symbol where the phase noise compensation reference signal is located relative to the symbol where the demodulation reference signal is located.
Preferably, the second estimation unit includes:
the first processing subunit is used for obtaining a precoding matrix according to the precoding matrix information;
and the multiplying subunit is configured to multiply the channel information by the precoding matrix to obtain synthesized channel information of a symbol where the phase noise compensation reference signal is located.
Preferably, the precoding matrix information is index information of the precoding matrix in a codebook predefined by the system, or is a numerical value of each element of the precoding matrix.
The invention also provides communication equipment comprising the transmitter.
The invention also provides communication equipment comprising the receiver.
The technical scheme of the invention has the following beneficial effects:
compared with the transmission method of the phase noise compensation reference signal in the prior art, in the embodiment of the invention, the phase noise compensation reference signal is not pre-coded, but is directly mapped to the transmitting antenna or the antenna port for transmission, and the phase noise compensation reference signal is not pre-coded, so that the phase noise compensation reference signal of each transmitting and receiving radio frequency channel can be accurately distinguished when the receiving end receives the phase noise compensation reference signal, the phase noise of each transmitting and receiving radio frequency channel can be accurately estimated, and the accurate phase noise estimation can be ensured even if the phase noise of different antennas of the transmitting end or the receiving end is different.
Drawings
Fig. 1 is a schematic time-frequency position diagram of a phase noise compensation reference signal for downlink transmission in the prior art;
FIG. 2 is a schematic diagram of the time-frequency position of a phase noise compensation reference signal for uplink transmission in the prior art;
fig. 3 is a flowchart illustrating a transmission method of a phase noise compensation reference signal according to an embodiment of the invention;
FIG. 4 is a flowchart illustrating a method for estimating phase noise according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a subframe configuration of a phase noise compensation reference signal according to an embodiment of the present invention;
fig. 6 is a block diagram of a transmitter according to an embodiment of the present invention;
fig. 7 is a block diagram of a receiver according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention will be made with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 3, an embodiment of the present invention provides a method for transmitting a phase noise compensation reference signal corresponding to a transmitting end of the phase noise compensation reference signal, where the method includes:
step 31: determining N phase noise compensation reference signals, wherein each phase noise compensation reference signal corresponds to a reference signal port, each phase noise compensation reference signal corresponds to one or more transmitting antennas or antenna ports, and the number of the transmitting antennas or antenna ports is Nt，N≤NtN and NtAre all positive integers;
wherein one antenna port corresponds to one or more transmit antennas.
Step 32: pre-coding a data stream to be transmitted and a demodulation reference signal corresponding to the data stream to obtain a pre-coded data stream and a demodulation reference signal, and mapping the pre-coded data stream and the demodulation reference signal to the NtTransmission is made over a transmit antenna or antenna port.
Step 33: mapping the N phase noise compensated reference signals to the NtTransmitting on a transmitting antenna or antenna port;
step 34: and informing the receiving end of the precoding matrix information adopted by precoding.
In the embodiment of the present invention, the execution order of step 32, step 33, and step 34 is not limited, and the execution order may be determined as needed.
Compared with the transmission method of the phase noise compensation reference signal in the prior art, in the embodiment of the invention, the phase noise compensation reference signal is not pre-coded, but is directly mapped to the transmitting antenna or the antenna port for transmission, and the phase noise compensation reference signal is not pre-coded, so that the phase noise compensation reference signal of each transmitting and receiving radio frequency channel can be accurately distinguished when the receiving end receives the phase noise compensation reference signal, the phase noise of each transmitting and receiving radio frequency channel can be accurately estimated, and the accurate phase noise estimation can be ensured even if the phase noise of different antennas of the transmitting end or the receiving end is different.
In some preferred embodiments of the present invention, the transmitting antennas or antenna ports with the same phase noise may share the same reference signal port. Of course, in some other embodiments of the present invention, multiple transmitting antennas or antenna ports with different phase noise may share the same reference signal port, for example, multiple transmitting antennas or antenna ports with close phase noise share the same reference signal port.
In the embodiment of the invention, when the phase noise of each transmitting antenna or each antenna port is different, N can be equal to NtThat is, one transmitting antenna or antenna port corresponds to one phase noise compensation reference signal, and each phase noise compensation reference signal corresponds to one reference signal port. When there are transmit antennas or antenna ports with the same phase noise, N may still be equal to NtThat is, one transmitting antenna or antenna port may also correspond to one phase noise compensation reference signal, or, when there are transmitting antennas or antenna ports with the same phase noise, the transmitting antennas or antenna ports with the same phase noise correspond to one phase noise compensation reference signal, that is, share one reference signal port, and at this time, N is smaller than Nt. In addition, N may be other values, for example, the system only needs to use 5 reference signal ports to transmit the phase noise compensation reference signal, in this case, N is equal to 5, and when the number of reference signal ports is small, the transmitting antennas or antenna ports with the same or similar phase noise may share one port.
In the embodiment of the invention, when the phase noise compensation reference signal is transmitted, N is equal to NtWhen the N phase noise compensation reference signals are received, mapping the N phase noise compensation reference signals to each corresponding transmitting antenna or antenna port one by one for transmission; when N is less than NtAnd mapping the phase noise compensation reference signal of the same reference signal port shared by a plurality of transmitting antennas or antenna ports to the plurality of transmitting antennas or antenna ports for transmission.
In some preferred embodiments of the present invention, to prevent mutual interference, the N phase noise compensation reference signals are mapped to the N phase noise compensation reference signalstEach of the reference signal ports may occupy one subcarrier or a plurality of subcarriers when transmitting on a plurality of transmit antennas or antenna ports. Of course, in some other embodiments of the present invention, a plurality of the reference signal ports may occupy one subcarrier or a plurality of subcarriers.
In an embodiment where each of the reference signal ports occupies one subcarrier, preferably, the N phase noise compensation reference signals are located on adjacent N subcarriers, and the adjacent N subcarriers may have approximately the same frequency domain channel characteristics. Of course, in some other embodiments of the present invention, the N phase noise compensation reference signals may not be adjacent, or at least partially not adjacent.
In some preferred embodiments of the present invention, the precoded data stream and demodulation reference signal are mapped to said NtWhen transmission is carried out on each transmitting antenna or antenna port, N is adopted as the precoded demodulation reference signalsA reference signal port, wherein NsIs the number of data streams.
In some embodiments of the present invention, the transmitting end may directly send the value of each element of the precoding matrix to the receiving end, and in order to reduce the transmission cost, preferably, the transmitting end may not directly transmit the value of each element of the precoding matrix, and may send the identification information of the precoding matrix to the receiving end, and the receiving end prestores the precoding matrix and the identification information corresponding to the precoding matrix, and when the receiving end receives the identification information of the precoding matrix, determines the precoding matrix according to the identification information.
In some preferred embodiments of the present invention, the precoding matrix information may be index information of a precoding matrix in a codebook predefined by the system. At this time, the receiving end prestores the precoding matrix and the index information corresponding to the precoding matrix, and when the receiving end receives the index information of the precoding matrix, the corresponding precoding matrix is found out from the codebook according to the index information.
In the embodiment of the present invention, the channel information of the symbol where the precoded data stream and the demodulation reference signal are located may be
Figure BDA0001124760640000081
The channel information of the symbol where the phase noise compensation reference signal is located may be
Figure BDA0001124760640000082
Where the subscripts k, l denote the kth subcarrier of the l-th symbol,
Figure BDA0001124760640000083
for phase noise at the receiver, Hk,lIn order to be a matrix of channels,
Figure BDA0001124760640000084
for phase noise at the transmitting end, Wk,lIs a precoding matrix.
Referring to fig. 4, an embodiment of the present invention provides a method for estimating phase noise corresponding to a receiving end of a phase noise compensation reference signal, where the method for estimating phase noise includes:
step 41: receiving a phase noise compensation reference signal, precoding matrix information, a precoded data stream and a demodulation reference signal which are sent by a transmitting terminal;
step 42: estimating the synthesized channel information of the symbol where the demodulation reference signal is located by using the demodulation reference signal;
step 43: estimating channel information of a symbol where the phase noise compensation reference signal is located by using the phase noise compensation reference signal, and obtaining synthetic channel information of the symbol where the phase noise compensation reference signal is located according to the channel information and precoding matrix information;
in this step, nxn of the symbol where the phase noise compensation reference signal is located can be obtainedrThe bars have channel information of different phase noise radio frequency channels, NrIs the number of receive antennas.
Step 44: and comparing the synthesized channel information of the symbol where the phase noise compensation reference signal is located with the synthesized channel information of the symbol where the demodulation reference signal is located to obtain the phase change of the symbol where the phase noise compensation reference signal is located relative to the symbol where the demodulation reference signal is located. The phase change is caused by phase noise.
In the embodiment of the invention, as the transmitting end does not pre-code the phase noise compensation reference signal, when the receiving end receives the phase noise compensation reference signal, the phase noise compensation reference signal of each transmitting and receiving radio frequency channel can be accurately distinguished, so that the phase noise of each transmitting and receiving radio frequency channel can be accurately estimated, and even if the phase noise of different antennas of the transmitting end or the receiving end is different, the accurate phase noise estimation can be ensured.
In the above embodiment, the execution order of step 42 and step 43 is not limited, and step 42 may be executed first, or step 43 may be executed first.
In this embodiment of the present invention, the step of obtaining the synthesized channel information of the symbol where the phase noise compensation reference signal is located according to the channel information and the precoding matrix information may include:
step 431: obtaining a precoding matrix according to the precoding matrix information;
step 432: and multiplying the channel information by the precoding matrix to obtain the synthesized channel information of the symbol where the phase noise compensation reference signal is located.
Preferably, the channel information of the symbol where the phase noise compensation reference signal is located is
Figure BDA0001124760640000091
Where the subscripts k, l denote the kth subcarrier of the l-th symbol,
Figure BDA0001124760640000092
for phase noise at the receiver, Hk,lIn order to be a matrix of channels,
Figure BDA0001124760640000093
for the phase noise of the transmitting end, the step of obtaining the synthesized channel information of the symbol where the phase noise compensation reference signal is located according to the channel information and the precoding matrix information includes: compensating the channel information of the symbol where the reference signal is located by the phase noise
Figure BDA0001124760640000101
And a precoding matrix Wk,lAnd multiplying to obtain the synthetic channel information of the kth subcarrier on the ith OFDM symbol where the phase noise compensation reference signal is located.
Preferably, the channel information of the symbol where the demodulation reference signal is located is
Figure BDA0001124760640000102
Wherein, Wk,lFor a precoding matrix, the step of comparing the synthesized channel information of the symbol where the phase noise compensation reference signal is located with the synthesized channel information of the symbol where the demodulation reference signal is located to obtain the phase change of the symbol where the phase noise compensation reference signal is located relative to the symbol where the demodulation reference signal is located includes: the elements in the composite channel information of the symbol where the phase noise compensation reference signal is located and
Figure BDA0001124760640000103
the elements in (a) are correspondingly divided and the phase is taken to obtain the phase change on each data stream.
In some embodiments of the present invention, the transmitting end may directly send the value of each element of the precoding matrix to the receiving end, and in order to reduce the transmission cost, preferably, the transmitting end may not directly transmit the value of each element of the precoding matrix, and may send the identification information of the precoding matrix to the receiving end, and the receiving end prestores the precoding matrix and the identification information corresponding to the precoding matrix, and when the receiving end receives the identification information of the precoding matrix, determines the precoding matrix according to the identification information.
In some preferred embodiments of the present invention, the precoding matrix information may be index information of a precoding matrix in a codebook predefined by the system. At this time, the receiving end prestores the precoding matrix and the index information corresponding to the precoding matrix, and when the receiving end receives the index information of the precoding matrix, the corresponding precoding matrix is found out from the codebook according to the index information.
Referring to fig. 5, fig. 5 is a schematic diagram of a subframe configuration of a phase noise compensation reference signal according to an embodiment of the present invention, in a subframe (subframe), a Demodulation reference signal (Demodulation RS) is located in a first OFDM symbol (OFDM symbol), and N is usedsOne reference signal port is transmitted and each reference signal port occupies one subcarrier (subcarrier). Phase noise compensation RSs of N reference signal ports (port #0, port #1, port #2, … … port # N-1) are located in the remaining OFDM symbols, where each reference signal port occupies one subcarrier and N Phase noise compensation RSs are located on adjacent subcarriers. The remainder being user data.
For the sending end:
1) suppose N is equal to Nt。
2) Assuming that a transmitting end determines to use a precoding matrix W according to feedback of a receiving endkUser data and demodulation reference signals are transmitted (since precoding matrices are the same in the same subframe, OFDM symbol subscripts are omitted in the embodiment of the present invention). At this time, the data stream and the demodulation reference signalThe channel passing through is
Figure BDA0001124760640000111
And the phase noise compensation reference signal passes through a channel of
Figure BDA0001124760640000112
Further can be expressed as:
Figure BDA0001124760640000113
3) the transmitting end will represent WkInforms the receiving end of the information. Preferably, the transmitting end is WkThe index information in the codebook predefined by the system is informed to the receiving end through the control channel.
For the receiving end:
4) the receiving end receives the demodulation reference signal at the first OFDM symbol and estimates the composite channel
Figure BDA0001124760640000114
Receiving phase noise compensation reference signals of N ports at the l-th OFDM symbol (l is more than or equal to 2), and estimating
Figure BDA0001124760640000115
Each element in the channel matrix (different N-port phase noise compensation reference signals in fig. 7 are located on adjacent N subcarriers and may have approximately the same frequency domain channel characteristics). Meanwhile, the receiving end receives the precoding matrix index information informed by the control channel, and finds the corresponding precoding matrix W in the codebookk. Will be estimated
Figure BDA0001124760640000116
Channel and WkMultiplying to obtain the composite channel information of the kth subcarrier on the ith OFDM
Figure BDA0001124760640000117
The elements of the channel information and the channel information
Figure BDA0001124760640000118
The element in (b) is divided correspondingly and the phase is taken, so that the phase change on each data stream can be obtained.
Referring to fig. 6, a transmission method corresponding to the phase noise compensation reference signal described above, an embodiment of the present invention further provides a transmitter, including:
a determining unit 61, configured to determine N phase noise compensation reference signals, where each phase noise compensation reference signal corresponds to a reference signal port, and each phase noise compensation reference signal corresponds to one or more transmitting antennas or antenna ports, where the number of the transmitting antennas or antenna ports is Nt，N≤NtN and NtAre all positive integers;
a transmission unit 62, configured to precode a data stream to be sent and a demodulation reference signal corresponding to the data stream to obtain a precoded data stream and a demodulation reference signal, and map the precoded data stream and the demodulation reference signal to the NtTransmitting on a plurality of transmit antennas or antenna ports, and mapping the N phase noise compensated reference signals to the N phase noise compensated reference signalstTransmitting on a transmitting antenna or antenna port;
an informing unit 63, configured to inform the receiving end of the precoding matrix information used in precoding.
Preferably, the transmitting antennas or antenna ports with the same phase noise share the same reference signal port. Of course, the transmitting antennas or antenna ports with the same phase noise may not share the same reference signal port.
Preferably, the transmission unit includes:
a first mapping subunit for mapping when N is equal to NtWhen the N phase noise compensation reference signals are received, mapping the N phase noise compensation reference signals to each corresponding transmitting antenna or antenna port one by one for transmission;
a second mapping subunit for, when N is less than NtMapping the phase noise compensated reference signal of the same reference signal port shared by multiple transmit antennas or antenna portsAnd transmitting to the plurality of transmitting antennas or antenna ports.
Preferably, the transmission unit maps the N phase noise compensation reference signals to the NtEach of the reference signal ports occupies one or more subcarriers when transmitting on multiple transmit antennas or antenna ports. Of course, in some other embodiments of the present invention, a plurality of the reference signal ports may occupy one subcarrier or a plurality of subcarriers.
Preferably, the N phase noise compensation reference signals are located on adjacent subcarriers. Of course, in some other embodiments of the present invention, the N phase noise compensation reference signals may not be adjacent, or at least partially not adjacent.
Preferably, the transmission unit maps the precoded data stream and the demodulation reference signal to the NtWhen transmission is carried out on each transmitting antenna or antenna port, N is adopted as the precoded demodulation reference signalsA reference signal port, wherein NsIs the number of data streams.
The precoding matrix information is index information of a precoding matrix in a codebook predefined by a system, or is a numerical value of each element of the precoding matrix.
Preferably, the channel information of the symbol where the precoded data stream and the demodulation reference signal are located is
Figure BDA0001124760640000121
The channel information of the symbol where the phase noise compensation reference signal is located is
Figure BDA0001124760640000122
Where the subscripts k, l denote the kth subcarrier of the l-th symbol,
Figure BDA0001124760640000123
for phase noise at the receiver, Hk,lIn order to be a matrix of channels,
Figure BDA0001124760640000124
for phase noise at the transmitting end, Wk,lIs a precoding matrix.
Referring to fig. 7, an embodiment of the present invention further provides a receiver corresponding to the method for estimating phase noise, including:
a receiving unit 71, configured to receive a phase noise compensation reference signal, precoding matrix information, a precoded data stream, and a demodulation reference signal sent by a transmitting end;
a first estimating unit 72, configured to estimate, by using the demodulation reference signal, synthesized channel information of a symbol where the demodulation reference signal is located;
a second estimating unit 73, configured to estimate channel information of a symbol where the phase noise compensation reference signal is located, by using the phase noise compensation reference signal;
a third estimating unit 74, configured to obtain, according to the channel information and the precoding matrix information, synthesized channel information of a symbol where the phase noise compensation reference signal is located;
the comparing unit 75 is configured to compare the synthesized channel information of the symbol where the phase noise compensation reference signal is located with the synthesized channel information of the symbol where the demodulation reference signal is located, so as to obtain a phase change of the symbol where the phase noise compensation reference signal is located relative to the symbol where the demodulation reference signal is located.
Preferably, the second estimating unit 73 includes:
the first processing subunit is used for obtaining a precoding matrix according to the precoding matrix information;
and the multiplying subunit is configured to multiply the channel information by the precoding matrix to obtain synthesized channel information of a symbol where the phase noise compensation reference signal is located.
Preferably, the channel information of the symbol where the phase noise compensation reference signal is located is
Figure BDA0001124760640000131
Where the subscripts k, l denote the kth subcarrier of the l-th symbol,
Figure BDA0001124760640000132
for phase noise at the receiver, Hk,lIn order to be a matrix of channels,
Figure BDA0001124760640000133
for the phase noise of the transmitting end, the phase noise is compensated by the phase multiplier subunit according to the channel information of the symbol where the reference signal is located
Figure BDA0001124760640000134
And a precoding matrix Wk,lAnd multiplying to obtain the synthetic channel information of the kth subcarrier on the ith OFDM symbol where the phase noise compensation reference signal is located.
Preferably, the channel information of the symbol where the demodulation reference signal is located is
Figure BDA0001124760640000135
Wherein, Wk,lThe comparison unit compares the elements in the composite channel information of the symbol where the phase noise compensation reference signal is located with the elements in the composite channel information of the symbol where the phase noise compensation reference signal is located
Figure BDA0001124760640000136
The elements in (a) are correspondingly divided and the phase is taken to obtain the phase change on each data stream.
The precoding matrix information is index information of a precoding matrix in a codebook predefined by a system, or is a numerical value of each element of the precoding matrix.
The embodiment of the invention also provides communication equipment comprising the transmitter.
The embodiment of the invention also provides communication equipment comprising the receiver.
An embodiment of the present invention further provides a data processing apparatus, including: a processor; and a memory connected to the processor through a bus interface, the memory being used to store programs and data used by the processor in performing operations, and when the processor calls and executes the programs and data stored in the memory, the memory including functional modules or units implementing:
a determining unit, configured to determine N phase noise compensation reference signals, where each phase noise compensation reference signal corresponds to a reference signal port, and each phase noise compensation reference signal corresponds to one or more transmitting antennas or antenna ports, where the number of the transmitting antennas or antenna ports is Nt，N≤NtN and NtAre all positive integers;
a transmission unit, configured to pre-code a data stream to be sent and a demodulation reference signal corresponding to the data stream to obtain a pre-coded data stream and a demodulation reference signal, and map the pre-coded data stream and the demodulation reference signal to the NtTransmitting on a plurality of transmit antennas or antenna ports, and mapping the N phase noise compensated reference signals to the N phase noise compensated reference signalstTransmitting on a transmitting antenna or antenna port;
and the informing unit is used for informing the receiving end of the precoding matrix information adopted by the precoding.
It should be noted that the data processing apparatus provided in the above embodiment of the present invention is an apparatus capable of correspondingly implementing the above transmission method for phase noise compensation reference signal, so that all embodiments of the transmission method for phase noise compensation reference signal provided in the above method embodiment can be correspondingly applied to the embodiment, and can achieve the same or similar beneficial effects.
An embodiment of the present invention further provides a data processing apparatus, including: a processor; and a memory connected to the processor through a bus interface, the memory being used to store programs and data used by the processor in performing operations, and when the processor calls and executes the programs and data stored in the memory, the memory including functional modules or units implementing:
the receiving unit is used for receiving the phase noise compensation reference signal, the precoding matrix information, the precoded data stream and the demodulation reference signal which are sent by the transmitting terminal;
a first estimating unit, configured to estimate, by using the demodulation reference signal, synthesized channel information of a symbol where the demodulation reference signal is located;
the second estimation unit is used for estimating the channel information of the symbol where the phase noise compensation reference signal is located by utilizing the phase noise compensation reference signal;
a third estimating unit, configured to obtain, according to the channel information and the precoding matrix information, synthesized channel information of a symbol where the phase noise compensation reference signal is located;
and the comparison unit is used for comparing the synthesized channel information of the symbol where the phase noise compensation reference signal is located with the synthesized channel information of the symbol where the demodulation reference signal is located to obtain the phase change of the symbol where the phase noise compensation reference signal is located relative to the symbol where the demodulation reference signal is located.
It should be noted that the data processing apparatus provided in the above embodiment of the present invention is an apparatus capable of implementing the above phase noise estimation method, so that all embodiments of the phase noise estimation method provided in the above method embodiment can be applied to the embodiment, and can achieve the same or similar beneficial effects.
In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the transceiving method according to various embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
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 (18)

1. A method for transmitting a phase noise compensated reference signal, comprising:
determining N phase noise compensation reference signals, wherein each phase noise compensation reference signal corresponds to a reference signal port, each phase noise compensation reference signal corresponds to one or more transmitting antennas or antenna ports, and the number of the transmitting antennas or antenna ports is Nt，N≤NtN and NtAre all positive integers;
pre-coding a data stream to be transmitted and a demodulation reference signal corresponding to the data stream to obtain a pre-coded data stream and a demodulation reference signal, and mapping the pre-coded data stream and the demodulation reference signal to the NtTransmitting on a plurality of transmit antennas or antenna ports, and mapping the N phase noise compensated reference signals to the N phase noise compensated reference signalstTransmitting on a transmitting antenna or antenna port;
and informing the receiving end of the precoding matrix information adopted by precoding.
2. The method according to claim 1, wherein the transmitting antennas with the same phase noise share the same reference signal port.
3. The method of claim 1, wherein the N phase noise compensated reference signals are mapped to the N phase noise compensated reference signalstThe step of transmitting on each transmit antenna or antenna port comprises:
when N is equal to NtWhen the N phase noise compensation reference signals are received, mapping the N phase noise compensation reference signals to each corresponding transmitting antenna or antenna port one by one for transmission;
when N is less than NtAnd mapping the phase noise compensation reference signal of the same reference signal port shared by a plurality of transmitting antennas or antenna ports to the plurality of transmitting antennas or antenna ports for transmission.
4. The method of claim 1, wherein the N is a function of mapping precoded data streams and demodulation reference signals to the NtWhen transmission is carried out on each transmitting antenna or antenna port, N is adopted as the precoded demodulation reference signalsA reference signal port, wherein NsIs the number of data streams.
5. The method for transmitting the phase noise compensation reference signal according to claim 1, wherein the precoding matrix information is index information of a precoding matrix in a codebook predefined by a system, or is a numerical value of each element of the precoding matrix.
6. A method for estimating phase noise, comprising:
receiving a phase noise compensation reference signal, precoding matrix information, a precoded data stream and a demodulation reference signal which are sent by a transmitting terminal; wherein the phase noise compensation reference signal is not precoded;
estimating the synthesized channel information of the symbol where the demodulation reference signal is located by using the demodulation reference signal;
estimating channel information of a symbol where the phase noise compensation reference signal is located by using the phase noise compensation reference signal, and obtaining synthetic channel information of the symbol where the phase noise compensation reference signal is located according to the channel information and precoding matrix information;
and comparing the synthesized channel information of the symbol where the phase noise compensation reference signal is located with the synthesized channel information of the symbol where the demodulation reference signal is located to obtain the phase change of the symbol where the phase noise compensation reference signal is located relative to the symbol where the demodulation reference signal is located.
7. The method for estimating phase noise according to claim 6, wherein the step of obtaining the synthesized channel information of the symbol where the phase noise compensation reference signal is located according to the channel information and the precoding matrix information comprises:
obtaining a precoding matrix according to the precoding matrix information;
and multiplying the channel information by the precoding matrix to obtain the synthesized channel information of the symbol where the phase noise compensation reference signal is located.
8. The method for estimating phase noise according to claim 6, wherein the precoding matrix information is index information of a precoding matrix in a codebook predefined by a system, or is a numerical value of each element of the precoding matrix.
9. A transmitter, comprising:
a determining unit for determining N phase noise compensation reference signals, wherein each phase noise compensation reference signal corresponds to a reference signal port, and each phase noise compensation reference signal corresponds to a reference signal portThe reference signal corresponds to one or more transmitting antennas or antenna ports, and the number of the transmitting antennas or antenna ports is Nt，N≤NtN and NtAre all positive integers;
a transmission unit, configured to pre-code a data stream to be sent and a demodulation reference signal corresponding to the data stream to obtain a pre-coded data stream and a demodulation reference signal, and map the pre-coded data stream and the demodulation reference signal to the NtTransmitting on a plurality of transmit antennas or antenna ports, and mapping the N phase noise compensated reference signals to the N phase noise compensated reference signalstTransmitting on a transmitting antenna or antenna port;
and the informing unit is used for informing the receiving end of the precoding matrix information adopted by the precoding.
10. The transmitter of claim 9, wherein the transmit antennas or antenna ports with the same phase noise share the same reference signal port.
11. The transmitter according to claim 9, wherein the transmission unit comprises:
a first mapping subunit for mapping when N is equal to NtWhen the N phase noise compensation reference signals are received, mapping the N phase noise compensation reference signals to each corresponding transmitting antenna or antenna port one by one for transmission;
a second mapping subunit for, when N is less than NtAnd mapping the phase noise compensation reference signal of the same reference signal port shared by a plurality of transmitting antennas or antenna ports to the plurality of transmitting antennas or antenna ports for transmission.
12. The transmitter of claim 11, wherein the transmission unit maps precoded data streams and demodulation reference signals to the NtWhen transmission is carried out on each transmitting antenna or antenna port, N is adopted as the precoded demodulation reference signalsA reference signal port, wherein NsIs a numberThe number of data streams.
13. The transmitter of claim 11, wherein the precoding matrix information is index information of a precoding matrix in a codebook predefined by a system, or a value of each element of the precoding matrix.
14. A receiver, comprising:
the receiving unit is used for receiving the phase noise compensation reference signal, the precoding matrix information, the precoded data stream and the demodulation reference signal which are sent by the transmitting terminal; wherein the phase noise compensation reference signal is not precoded;
a first estimating unit, configured to estimate, by using the demodulation reference signal, synthesized channel information of a symbol where the demodulation reference signal is located;
the second estimation unit is used for estimating the channel information of the symbol where the phase noise compensation reference signal is located by utilizing the phase noise compensation reference signal;
a third estimating unit, configured to obtain, according to the channel information and the precoding matrix information, synthesized channel information of a symbol where the phase noise compensation reference signal is located;
and the comparison unit is used for comparing the synthesized channel information of the symbol where the phase noise compensation reference signal is located with the synthesized channel information of the symbol where the demodulation reference signal is located to obtain the phase change of the symbol where the phase noise compensation reference signal is located relative to the symbol where the demodulation reference signal is located.
15. The receiver of claim 14, wherein the second estimating unit comprises:
the first processing subunit is used for obtaining a precoding matrix according to the precoding matrix information;
and the multiplying subunit is configured to multiply the channel information by the precoding matrix to obtain synthesized channel information of a symbol where the phase noise compensation reference signal is located.
16. The receiver of claim 14, wherein the precoding matrix information is index information of a precoding matrix in a codebook predefined by a system, or a numerical value of each element of the precoding matrix.
17. A communication device comprising a transmitter as claimed in any one of claims 9 to 13.
18. A communication device comprising a receiver as claimed in any one of claims 14 to 16.
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