WO2011137771A1 - 一种信道估计方法、装置和系统 - Google Patents

一种信道估计方法、装置和系统 Download PDF

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Publication number
WO2011137771A1
WO2011137771A1 PCT/CN2011/074114 CN2011074114W WO2011137771A1 WO 2011137771 A1 WO2011137771 A1 WO 2011137771A1 CN 2011074114 W CN2011074114 W CN 2011074114W WO 2011137771 A1 WO2011137771 A1 WO 2011137771A1
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WIPO (PCT)
Prior art keywords
srs
band
inband
dmrs
transmitted
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PCT/CN2011/074114
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English (en)
French (fr)
Inventor
万蕾
李强
周明宇
夏媛
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP11777190.7A priority Critical patent/EP2590340B1/en
Publication of WO2011137771A1 publication Critical patent/WO2011137771A1/zh
Priority to US13/750,167 priority patent/US8908818B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/0224Channel estimation using sounding signals
    • H04L25/0226Channel estimation using sounding signals sounding signals per se
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/0204Channel estimation of multiple channels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/0224Channel estimation using sounding signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0417Feedback systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a channel estimation method, apparatus, and system. Background technique
  • DMRS Demodulation Reference Signal
  • the method for channel estimation using DMRS can be as follows:
  • the N is the number of DMRSs to be transmitted, where N k ⁇ N tx shifts the DMRSs with different cyclic shifts (CS, Cyclic Shift) TAC, on each subcarrier, to obtain a vector;?? multiplying one dimension> ⁇ precoding matrix ⁇ ⁇ dish to give a> ⁇ ⁇ dish ⁇ 1 vector dimension, and finally ⁇ ⁇ ?
  • CS Cyclic Shift
  • H is a matrix of N fa x N ra dimensions, representing complete channel information, but a white noise signal, due to? It is known, so channel estimation can be performed according to the received signal.
  • the DMRS adopts the precoding method, and the number of transmissions N ra ⁇ is less than or equal to N fa , only the HP DMSS can be estimated, and the H cannot be estimated. That is, complete channel information cannot be obtained; if it is necessary to estimate H, it is necessary to make the number of mutually orthogonal reference signals transmitted equal to the number of transmitting antenna ports.
  • SRS Sounding Reference Signal
  • an in-band measurement reference signal Inband SRS
  • the so-called in-band measurement reference signal refers to the SRS transmitted by the user on the allocated time-frequency resource; that is, the user is in the system.
  • SRS is also transmitted.
  • the existing scheme can estimate the complete channel information, the overhead is large because it is required to additionally transmit an SRS equal to the number of transmitting antenna ports N fa .
  • Embodiments of the present invention provide a channel estimation method, apparatus, and system, which can estimate complete channel information with less overhead.
  • a channel estimation method includes:
  • the number of transmit antenna ports and the number of layers of the currently transmitted DMRS are obtained;
  • a channel estimation method includes:
  • the number of the inband SRS is the difference between the number of transmitting antenna ports of the sending end device and the number of layers of the currently transmitted DMRS;
  • Channel estimation is performed based on the received inband SRS and the currently transmitted DMRS.
  • a transmitting device includes:
  • An acquiring unit configured to obtain, when determining that an inband SRS needs to be sent, the number of transmit antenna ports and the number of layers of the currently transmitted DMRS;
  • An operation unit configured to calculate a difference between the number of the transmit antenna ports acquired by the acquiring unit and the number of layers of the currently transmitted DMRS, and use the difference as the number of in-band SRSs to be sent;
  • the inband SRS is sent to the receiving end device according to the number of inband SRSs that need to be sent according to the calculation unit, so that the receiving end device performs channel estimation according to the currently transmitted DMRS and the received inband SRS.
  • a receiving device includes:
  • a receiving unit configured to receive an inband SRS sent by the sending end device, where the number of the inband SRS is a difference between the number of transmitting antenna ports of the sending end and the number of layers of the currently transmitted DMRS;
  • An estimating unit configured to receive an in-band SRS according to the currently transmitted DMRS and the receiving unit Perform channel estimation.
  • a communication system includes any of the transmitting end device provided by the embodiment of the present invention and any receiving end device provided by the embodiment.
  • the difference between the number of transmitting antenna ports N fa and the number of layers N ⁇ of the currently transmitted DMRS is used as the number of in-band SRSs to be transmitted, and the in-band SRS is sent to the receiving end, and then the in-band SRS is used at the receiving end device.
  • Channel estimation is performed in combination with DMRS.
  • N fa in -band SRSs which can reduce the overhead by reducing the number of in-band SRSs transmitted; that is, compared with the prior art, In this scheme, complete channel information can be estimated with less overhead.
  • FIG. 1 is a flowchart of a method for a channel estimation method according to Embodiment 1 of the present invention
  • FIG. 2 is a flowchart of a method for a channel estimation method according to Embodiment 2 of the present invention
  • FIG. 3 is a flowchart of a method for a channel estimation method according to Embodiment 3 of the present invention.
  • FIG. 4a is a schematic structural diagram of a device at a transmitting end according to an embodiment of the present invention.
  • 4b is another schematic structural diagram of a transmitting end device according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a receiving end device according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
  • Embodiments of the present invention provide a channel estimation method, apparatus, and system. The details are described below separately.
  • Embodiment 1
  • a transmitting device which may be a terminal, such as a mobile phone or a laptop computer, or the like, or other devices that can transmit uplink data.
  • a channel estimation method includes: when determining that an in-band SRS needs to be transmitted, acquiring a number of transmit antenna ports and a layer of a currently transmitted DMRS; calculating a difference between a number of transmit antenna ports and a layer of the currently transmitted DMRS, The difference is taken as the number of in-band SRSs to be transmitted; the in-band SRS is transmitted to the receiving end according to the number of in-band SRSs to be transmitted, so that the receiving end estimates according to the received inband SRS and the currently transmitted DMRS channel.
  • the high-level signaling configuration parameter may be used to indicate that the in-band SRS needs to be sent when some conditions are met.
  • the transmitting device (such as the terminal) sends an in-band SRS every time it is scheduled X times, and so on.
  • the physical layer downlink control signaling is first received, and the physical layer downlink control signaling is used to indicate the uplink sending parameter. Therefore, in order to save the signaling process, the physical layer may be
  • the downlink control signaling carries the indication information about whether the inband SRS needs to be sent to trigger the transmission of the inband SRS.
  • the new physical layer downlink control signaling may also indicate whether the inband SRS needs to be sent.
  • N tx - N rank the difference is taken as the number of in-band SRSs to be transmitted, N sss , ie NN - N ⁇
  • the in-band SRS is sent to the receiving end, so that the receiving end performs channel estimation according to the received in-band SRS and the currently transmitted DMRS.
  • the details can be as follows:
  • S1 Select a precoding matrix P sss from the set codebook according to the number of inband SRSs to be sent; for example, receive downlink control signaling carrying a selection rule, and then receive according to the number of inband SRSs.
  • the selection rule selects the precoding matrix P sss ;
  • the precoding matrix P may be selected according to a preset selection rule according to the number of in-band SRSs.
  • the selection rule may directly indicate which precoding matrix is selected, or may indicate a mapping rule.
  • each precoding matrix of the DMRS defines a precoding matrix of a paired SRS in advance, so that the DMRS is learned.
  • the precoding matrix P SRS of the corresponding SRS can be selected according to the mapping rule.
  • S2 selecting an SRS according to the number of in-band SRSs to be sent, and orthogonalizing the selected SRS;
  • orthogonalization for example, orthogonalization of the selected SRS by cyclic shift orthogonalization, and the like, as can be seen in the prior art.
  • cyclic shift refers to which cyclic shifts are specifically used, and the number of cyclic shifts is the same as the number of in-band SRSs, that is, the number of cyclic shifts is N SRS .
  • the determining the cyclic shift may be performed in multiple manners, for example, the manner in which the downlink control signaling is used for notification, or the manner in which the preset rule is used for calculation, or the manner specified in advance to determine the cyclic shift, etc.; as follows:
  • the manner in which the receiving end device performs notification through downlink control signaling that is, the receiving is used to indicate the following
  • the downlink control signaling of the ring shift for example, in the downlink control signaling of the subframe in which the SRS is scheduled, illustrates which cyclic shifts are used.
  • a preset manner that is, which cyclic shifts are used for transmitting N sss SRSs by high-level signaling in advance.
  • pre-coding the orthogonalized SRS by using the selected pre-coding matrix to obtain a pre-coded SRS For the specific operation of the pre-coding, refer to the prior art, and details are not described herein.
  • the pre-coded SRS may be transmitted on the SC-FDMA symbol transmitting the DMRS through each antenna port; or, the pre-coded SRS may be transmitted on the SC-FDMA symbol for transmitting data through each antenna port, for example An SC-FDMA symbol originally used to transmit data may be reserved for transmitting the pre-coded SRS.
  • steps S1 and S2 may be performed in no particular order.
  • the number of RSs to be transmitted is equal to the number of transmitting antenna ports N fa . Therefore, in this embodiment, although only N fa -N ra réelle A in -band SRSs are transmitted, it is still possible to estimate the complete Channel information.
  • the difference between the number of transmit antenna ports N tx and the tN mnk of the currently transmitted DMRS is used as the number of in-band SRSs to be transmitted, and the in-band SRS is sent to the receiving end device, and then at the receiving end device.
  • Channel estimation is performed by combining in-band SRS and DMRS.
  • a receiving end device which may be a network side device, such as a base station or a server, or the like, or other devices that can receive uplink data.
  • a network side device such as a base station or a server, or the like, or other devices that can receive uplink data.
  • a channel estimation method includes: receiving an inband SRS sent by a transmitting end, where the number of inband SRSs is a difference between a number of transmitting antenna ports of the transmitting end device and a layer of the currently transmitted DMRS; according to the received inband SRS Channel estimation is performed with the currently transmitted DMRS.
  • N N -N ⁇
  • the total number of RSs is N fa , so, in this embodiment, although only N fa -N ra réelle A in -band SRSs are received, since N ra réelle A DMRSs are also received, they can still be satisfied.
  • the number of received RSs is equal to the number of transmit antenna ports N fa , so complete channel information can be estimated.
  • the algorithm for performing channel estimation may be various.
  • the currently transmitted DMRS and the received in-band SRS may be respectively de-orthogonalized to obtain two estimation matrices, and then the two estimation matrices are combined and performed. Solve to estimate the complete channel matrix information.
  • the details can be as follows:
  • the receiving device can obtain the received signal DMRS about the DMRS (see prior art):
  • the DMRS is N ra ⁇ DMRS vector after a DMRS cyclic shift with different orthogonalization on each subcarrier obtained, P precoding matrix is 0 ⁇ 111 ⁇ 2 5 is, H is a N faX N ra-dimensional The matrix, representing the complete channel information, ⁇ is the noise.
  • RS is to orthogonalize W sss SRSs with different cyclic shifts, and on each subcarrier, the obtained SRS, P sss is a precoding matrix of SRS, and H is an N fa X N ra dimension Matrix, representing complete channel information, ⁇ is noise.
  • the sender device Since the sender device is transmitting DMRS and SRS, the DMRS vector? DMRS and SRS vectors? SRS is orthogonalized by cyclic shift. Therefore, after receiving the DMRS and SRS, the receiving device needs to de-orthogonalize the received DMRS and SRS respectively to obtain:
  • X RS - HP DM wS + ⁇ ⁇ X sss HP SSS + 2 .
  • X 5 and X sss are estimates of HP 5 and HP SSS , respectively. Since the precoding matrix of the DMRS and the precoding matrix P sss of the 811 ⁇ 2 are known to the receiving device, if the noise sum is not considered, the two matrix equations can be written as linear equations respectively. , as follows:
  • X ⁇ s represents the value of the i-th row and the j-th column of the matrix
  • ⁇ 5 ⁇ represents the value of the i-th row and the j-th column of the matrix
  • X ss represents the i-th row of the matrix H
  • / ⁇ ⁇ represents the j-th column of the matrix ⁇ ⁇ ⁇ ⁇ 5
  • the difference between the number of transmit antenna ports N fa and the tN mnk of the currently transmitted DMRS is used as the number of in-band SRSs to be transmitted, and the in-band SRS is sent to the receiving end device, and then at the receiving end device.
  • the in-band SRS is sent to the receiving end device, and then at the receiving end device.
  • the receiving device only receives the N fa - N raii in -band SRS, since the N ra noir 3 ⁇ 4 DMRS is also received, the number of RSs is still the same as the transmitting antenna port for the receiving device. The number is equal, so the solution provided by this example can estimate the complete channel information with less overhead than the prior art needs to send N fa in -band SRS.
  • the terminal When the terminal is scheduled to transmit data, the terminal first determines whether an in-band SRS needs to be sent in the subframe, and if necessary, performs step 302; otherwise, if not, the process ends.
  • the high-level signaling configuration parameter may be used in advance to indicate that the in-band SRS needs to be sent when some conditions are met, for example, the in-band SRS is sent once every time the terminal is scheduled X times, and so on.
  • the base station may send physical layer downlink control signaling to indicate whether an in-band SRS needs to be sent.
  • the terminal acquires initial information, where the initial information includes the number of transmit antenna ports N fa of the sending end device and the number of layers of the currently transmitted DMRS N rahunt 3 ⁇ 4 , and may also include a precoding matrix ⁇ ⁇ used by the currently transmitted DMRS.
  • the initial information includes the number of transmit antenna ports N fa of the sending end device and the number of layers of the currently transmitted DMRS N rahunt 3 ⁇ 4 , and may also include a precoding matrix ⁇ ⁇ used by the currently transmitted DMRS.
  • the terminal calculates parameters required to send the inband SRS, as follows:
  • N ss The number of in-band SRSs that need to be sent, N ss , that is, how many SRSs need to be sent;
  • DMRS and SRS can be combined as the RS required for channel estimation. Since N ⁇ DMRSs have been transmitted, only N fa - N raii inbands need to be sent here. SRS can satisfy the conditions required to estimate the complete channel information: The number of RSs transmitted should be equal to the number of transmitting antenna ports N fa . Therefore, the number of in-band SRSs that need to be sent N SRS _ N ix _ N rank
  • a precoding matrix V SRS is selected from the set codebook, for example, from the precoding matrix list, and the dimension of P SRS is N tx xN SRS ;
  • the selection rule may directly indicate which precoding matrix is selected, or may indicate a mapping rule.
  • each precoding matrix of the DMRS defines a precoding matrix of a paired SRS in advance, so that the DMRS is learned.
  • the precoding matrix P SRS of the corresponding SRS can be selected according to the mapping rule.
  • the terminal selects an SRS according to the number of in-band SRSs that need to be sent, that is, the terminal selects one SRS, and orthogonalizes the selected SRS.
  • the terminal selects one SRS, and orthogonalizes the selected SRS.
  • there are multiple ways of orthogonalization for example, using a cyclic shift.
  • the orthogonalization method orthogonalizes the selected SRS, and so on. For details, refer to the prior art.
  • N ss cyclic shifts are needed, and the specific N SRS cyclic shifts can be specified by the downlink control signaling. Alternatively, it may be determined by using a preset rule for calculation, or may be configured by a high-level signaling device, for example, which cyclic shift is used to transmit the SRS, and so on.
  • the terminal pre-codes the orthogonalized SRS by using the selected pre-coding matrix P ss to obtain a pre-coded SRS.
  • the specific operation of the pre-coding may be referred to the prior art, and details are not described herein again.
  • the terminal sends the pre-coded SRS to the base station in the band through each antenna port.
  • the terminal may send the pre-coded SRS to the base station on the SC-FDMA symbol of the DMRS through each antenna port;
  • the terminal may also send the pre-coded SRS to the base station on the SC-FDMA symbol for transmitting data through each antenna port.
  • an SC-FDMA symbol originally used for transmitting data may be reserved for transmission. SRS after encoding.
  • the base station After receiving the inband SRS sent by the terminal, the base station, after receiving the precoded SRS sent in step 306, combines the received inband SRS with the currently transmitted DMRS to perform channel estimation. For example, refer to the algorithm listed in the second embodiment.
  • the terminal in this embodiment adopts the number of transmitting antenna ports N fa and the current transmission.
  • the embodiment of the present invention further provides a transmitting end device.
  • the transmitting end device may include an obtaining unit 401, an operating unit 402, and a sending unit 403.
  • the number of transmit antenna ports and the number of layers of the currently transmitted DMRS are obtained;
  • the in-band SRS needs to be sent according to the set parameters, or the in-band SRS needs to be sent according to the physical layer downlink control signaling.
  • the operation unit 402 is configured to calculate a difference between the number of transmit antenna ports acquired by the obtaining unit 401 and the number of layers of the currently transmitted DMRS, and use the difference as the number of in-band SRSs to be sent; for example, if the number of transmit antenna ports For N fa , the number of layers of the currently transmitted DMRS is N raii , and the number of in-band SRSs to be transmitted is N SRS , and the number of in-band SRSs that need to be transmitted can be expressed as
  • the sending unit 403 is configured to send the inband SRS to the receiving end device according to the number of inband SRSs that need to be sent calculated by the computing unit 402, so that the receiving end device performs channel estimation according to the currently transmitted DMRS and the received inband SRS.
  • the sending unit 403 may include a selecting subunit 4031, an orthogonalizing subunit 4032, a precoding subunit 4033, and a transmitting subunit 4034, see FIG. 4b;
  • the selecting subunit 4031 is configured to select a precoding matrix from the set codebook according to the number of inband SRSs that need to be sent calculated by the computing unit 402.
  • the selecting subunit 4031 may be specifically configured to receive the carrying rule. Downlink control signaling, and then selecting a precoding matrix P ss from the set codebook according to the received selection rule according to the number of inband SRSs; or, according to the number of inband SRSs, according to the set selection rule
  • the precoding matrix P ss is selected from the codebook predefined by the protocol.
  • the orthogonalization sub-unit 4032 is configured to calculate the in-band to be transmitted according to the operation unit 402.
  • the number of SRSs is selected by SRS, and the selected SRS is orthogonalized; among them, there are many ways of orthogonalization
  • the selected SRS is orthogonalized by a cyclic shift orthogonalization method, and the like, and the related art can be specifically referred to.
  • N SRS cyclic shifts are required, and specifically, which N SRS cyclic shifts can be specified by the downlink control signaling. Alternatively, it may be determined by using a preset rule for calculation, or may be configured by a high-level signaling device, for example, which cyclic shift is used to transmit the SRS, and so on.
  • the precoding subunit 4033 is configured to precode the SRS orthogonalized by the orthogonalization subunit 4032 by using a precoding matrix selected by the selecting subunit 4031 to obtain a precoded SRS.
  • the sending sub-unit 4034 is configured to send the pre-coded sub-unit 4033 to the receiving end device by using the pre-coding sub-unit 4033 in the band.
  • the pre-coded SRS may be sent to the receiving end device on the SC-FDMA symbol transmitting the DMRS through each antenna port; or, the pre-send may be sent on the SC-FDMA symbol for transmitting data through each antenna port.
  • the encoded SRS is sent to the receiving device, for example, an SC-FDMA symbol originally used for transmitting data can be reserved for transmitting the pre-coded SRS.
  • the sender device can be a terminal, such as a mobile phone or a laptop computer, or the like, or other devices that can transmit uplink data.
  • the number of ports N tx and the number of layers of the currently transmitted DMRS N raii , and then the difference between the number of transmit antenna ports N tx and the number of layers Navi of the currently transmitted DMRS by the operation unit 402 is taken as the number of in-band SRSs to be transmitted N SRS
  • the N SRS SRSs are sent by the sending unit 403 to the base station, and then the base station combines the in-band SRS and the DMRS to perform channel estimation.
  • the embodiment of the present invention further provides a receiving end device.
  • the receiving end device includes a receiving unit 501 and an estimating unit 502.
  • the estimating unit 502 is configured to perform channel estimation according to the currently transmitted DMRS and the in-band SRS received by the receiving unit 501.
  • a de-orthogonalization unit configured to perform de-orthogonalization on the received current transmitted DMRS and the in-band SRS received by the receiving unit 501, to obtain two estimation matrices;
  • An estimation subunit for estimating complete channel matrix information from two estimation matrices obtained by the denormalization unit is an estimation subunit for estimating complete channel matrix information from two estimation matrices obtained by the denormalization unit.
  • the receiving device may be a network side device, such as a base station or a server, or the like, or may be another device that can receive uplink data.
  • the number is N fa , so in this embodiment, although only N fa -N raii in -band SRSs are transmitted, the condition that the number of transmitted RSs is equal to the number of transmitting antenna ports N tx is still satisfied, so Complete channel information can be estimated.
  • the receiving unit 501 of the receiving end device of the embodiment can receive the in-band SRS, where the number of the in-band SRS is the difference between the number of transmitting antenna ports N tx and the number of layers of the currently transmitted DMRS N raii , and then by the estimation unit 502 receives in-band SRS and DMRS combined channel estimation, in the embodiment of the present invention, while receiving only the N fa -N raii bands SRS, but because also receives the N ra "3 ⁇ 4 DMRS, so for the receiving device, the number of RSs is equal to the number of transmitting antenna ports. Therefore, the solution provided in this example can be used to send N fa in -band SRSs compared to the prior art. Small overhead estimates complete channel information.
  • the embodiment of the present invention further provides a communication system, which includes any of the sending end device provided by the embodiment of the present invention and any receiving end device provided by the embodiment;
  • the communication system includes a sender device 400 and a receiver device 500.
  • the sender device 400 is configured to acquire the number of transmit antenna ports N TX and the current transmission when it is determined that the inband SRS needs to be sent.
  • the number of layers of the DMRS, N RAII calculates the difference between the acquired number of transmit antenna ports N FA and the number of layers of the currently transmitted DMRS, N RAII , as the number of in-band SRSs to be transmitted, N SS , ?
  • N SRS N TX - N M scratch K , and then send the in-band SRS to the receiving device 500 according to the number of in-band SRSs; wherein the in-band SRS is sent to the receiving device 500 according to the number of in-band SRSs N SRS Can be as follows:
  • a precoding matrix P is selected from the precoding matrix list, and the dimension of P s « s is xN SS ;
  • the pre-coded SRS is sent to the base station in-band through each antenna port, and may be transmitted on the SC-FDMA symbol of the transmitted DMRS or may be transmitted on the reserved SC-FDMA symbol.
  • the receiving end device 500 is configured to receive the inband SRS sent by the sending end device 400, and perform channel estimation according to the currently transmitted DMRS and the received inband SRS.
  • the transmitting end device 400 of the communication system provided in this embodiment adopts the difference between the number of transmitting antenna ports N TX and the number of layers DLRS of the currently transmitted DMRS as the number of N SRS transmission bands of the in-band SRS to be transmitted.
  • the inner SRS is sent to the receiving device 500, and then the receiving device 500 combines the inband SRS with the DMRS for channel estimation.
  • the receiving device 500 since the N RA II DMRSs are also received, the number of RSs is equal to the number of transmit antenna ports for the receiving device 500. Therefore, the solution provided by this example needs to send N FA bands compared to the prior art.
  • the program may be stored in a computer readable storage medium, and the storage medium may include: Read only memory (ROM, Read Only Memory), random access memory (RAM), disk or optical disk.

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Abstract

一种信道估计方法,包括:当确定需要发送带内SRS时,获取发射天线端口数量和当前传输的DMRS的层数;计算所述发射天线端口数量与当前传输的DMRS的层数的差值,将该差值作为需要发送的带内SRS的数量;根据需要发送的带内SRS的数量发送带内SRS给接收端设备,以便接收端设备根据当前传输的DMRS以及接收到的带内SRS进行信道估计。一种信道估计方法,包括:接收发送端设备发送的带内SRS,所述带内SRS的数量为发送端设备的发射天线端口数量与当前传输的DMRS的层数的差;根据接收到的带内SRS与当前传输的DMRS进行信道估计。还提供一种发送端设备、一种接收端设备、以及一种通信系统。

Description

一种信道估计方法、 装置和系统
本申请要求于 2010年 7月 26日提交中国专利局、 申请号为 20101023939
4.8、 发明名称为 "一种信道估计方法、 装置和系统" 的中国专利申请的优先 权, 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域, 具体涉及一种信道估计方法、 装置和系统。 背景技术
解调参考信号 (DMRS, Demodulation Reference Signal )作为一种参考信 息, 是接收端和发送端都已知的信号, 通过对 DMRS的检测和计算, 可以对该 信道进行信道估计, 从而获知该信道当前的状况。
例如, 如果上行采用多天线传输技术, 发送天线端口数是 Nfa , 接收天线 端口数是 Nra , 则利用 DMRS进行信道估计的方法可以如下:
首先, 确定子帧传输的 DMRS的传输层数 Nra„ 该 N 即为需要发送的 DMRS的个数,其中, N k≤Ntx 将 个 DMRS用不同的循环移位(CS, Cyclic Shift )正交化, 在每一个子载波上, 得到向量?; 将?乘以一个维度为 >< ^ 的预编码矩阵 Ρβ皿 ,得到一个 >< 1维的向量 ΡβΧ? , 最后将 Ρβ皿 X?的每一个 分量放到一个发送天线端口上进行发送, 则此时接收端接收到的信号 可以表 示成: = HPDMSS x ? + w 。
其中, H是一个 Nfa x Nra维的矩阵, 表示完整的信道信息, 而 则是白噪声 信号, 由于?是已知的,所以可以根据接收信号 进行信道估计,但由于 DMRS 采用了预编码的方式, 而且发送的个数 Nra^小于等于 Nfa , 所以只能估计出 HPDMSS , 而无法估计出 H , 即无法得到完整的信道信息; 如果需要估计出 H , 则需要使得发送的相互正交的参考信号的个数与发射天线端口数 相等。
所以, 在现有技术中, 除了发送 DMRS之外, 还需要另外发送没有采用预 编码的测量参考信号 (SRS, Sounding Reference Signal ) , 其中, 发送的 SRS 个数与发射天线端口数 相等。 并且, 为了增加 SRS的容量, 一般会采用带内 测量参考信号(Inband SRS ); 所谓带内测量参考信号, 指的是用户在分配到 的时频资源上所传送的 SRS; 即用户在系统所分配给自己的时频资源上除了传 送数据和 DMRS之外, 还传送 SRS。
现有的方案虽然可以估计出完整的信道信息,但是由于需要另外发送与发 射天线端口数 Nfa相等个数的 SRS, 所以开销较大。
发明内容
本发明实施例提供一种信道估计方法、装置和系统, 可以用更小的开销估 计出完整的信道信息。
一种信道估计方法, 包括:
当确定需要发送带内 SRS时, 获取发射天线端口数量和当前传输的 DMRS 的层数;
计算所述发射天线端口数量与所述当前传输的 DMRS的层数的差值,将所 述差值作为需要发送的带内 SRS的数量;
根据所述需要发送的带内 SRS的数量发送带内 SRS给接收端设备, 以便所 述接收端设备根据当前传输的 DMRS以及接收到的带内 SRS进行信道估计。
一种信道估计方法, 包括:
接收发送端设备发送的带内 SRS, 所述带内 SRS的数量为所述发送端设备 发射天线端口数量与当前传输的 DMRS的层数的差;
根据接收到的带内 SRS与当前传输的 DMRS进行信道估计。
一种发送端设备, 包括:
获取单元, 用于当确定需要发送带内 SRS时, 获取发射天线端口数量和当 前传输的 DMRS的层数;
运算单元,用于计算获取单元获取到的所述发射天线端口数量与所述当前 传输的 DMRS的层数的差值, 将所述差值作为需要发送的带内 SRS的数量; 发送单元, 用于根据所述运算单元计算得到的需要发送的带内 SRS的数量 发送带内 SRS给接收端设备, 以便接收端设备根据当前传输的 DMRS以及接收 到的带内 SRS进行信道估计。
一种接收端设备, 包括:
接收单元, 用于接收发送端设备发送的带内 SRS, 所述带内 SRS的数量为 所述发送端的发射天线端口数量与当前传输的 DMRS的层数的差;
估计单元, 用于根据当前传输的 DMRS与所述接收单元接收到的带内 SRS 进行信道估计。
一种通信系统,包括本发明实施例提供的任一种发送端设备和实施例提供 的任一种接收端设备。
本发明实施例采用将发射天线端口数量 Nfa与当前传输的 DMRS 的层数 N ^的差作为需要发送的带内 SRS的数量发送带内 SRS给接收端, 然后在接 收端设备将带内 SRS与 DMRS相结合进行信道估计, 在本发明的方案中, 虽 然只发送了 Nfa - Nra^个带内 SRS , 但由于同时还发送了 N^个 DMRS, 所以对 于接收端来说, RS ( DMRS和 SRS都是 RS )的数目为 " Ntx - N k + Nmnk = Ntx " , 满足了发送的 RS个数要与发射天线端口数 Nfa相等的要求,所以可以估计出完 整的信道信息, 与此同时, 相对于现有技术需要发送 Nfa个带内 SRS而言, 该 方案由于减少了发送的带内 SRS的数量, 所以可以减少开销; 即相对于现有 技术而言, 采用该方案, 可以用更小的开销估计出完整的信道信息。
附图说明
为了更清楚地说明本发明实施例中的技术方案,下面将对实施例描述中所 需要使用的附图作筒单地介绍,显而易见地, 下面描述中的附图仅仅是本发明 的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下, 还可以根据这些附图获得其他的附图。
图 1是本发明实施例一提供的信道估计方法的方法流程图;
图 2是本发明实施例二提供的信道估计方法的方法流程图;
图 3是本发明实施例三提供的信道估计方法的方法流程图;
图 4a是本发明实施例提供的发送端设备的结构示意图;
图 4b是本发明实施例提供的发送端设备的另一结构示意图;
图 5是本发明实施例提供的接收端设备的结构示意图;
图 6是本发明实施例提供的通信系统的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清 楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是 全部的实施例。基于本发明中的实施例, 本领域普通技术人员在没有作出创造 性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范围。 本发明实施例提供一种信道估计方法、装置和系统。 以下分别进行详细说 明。 实施例一、
本发明实施例将从发送端设备的角度进行描述, 该发送端设备可以为终 端, 比如手机或笔记本电脑等等, 或者也可以为其他可以发送上行链路数据的 设备。
一种信道估计方法, 包括: 当确定需要发送带内 SRS时, 获取发射天线端 口数量和当前传输的 DMRS的层数; 计算发射天线端口数量与当前传输的 DMRS的层数的差值, 将该差值作为需要发送的带内 SRS的数量; 根据需要发 送的带内 SRS的数量发送带内 SRS给接收端, 以便接收端根据接收到的带内 SRS和当前传输的 DMRS信道估计。
如图 1所示, 具体流程可以如下:
101、 当确定需要发送带内 SRS时, 获取发射天线端口数量 和当前传输 的 DMRS的层数 NraA (传输的 DMRS的层数即传输的 DMRS的数量, 参见背景 技术;);
其中, 确定是否需要发送带内 SRS可以采用如下任一种方法:
( 1 )根据设置的参数确定需要发送带内 SRS;
例如, 可以预先通过高层信令配置参数,表示在满足一些条件的时候需要 发送带内 SRS, 比如该发送端设备(如终端)每被调度 X次, 则发送一次带内 SRS, 等等。
( 2 )根据物理层下行控制信令来确定需要发送带内 SRS。
一般而言, 发送端设备被调度之前会首先接收到一个物理层下行控制信 令, 该物理层下行控制信令用以指示上行发送的参数, 所以, 为了节省信令流 程, 可以在该物理层下行控制信令中携带关于是否需要发送带内 SRS的指示信 息来触发带内 SRS的发送, 比如, 当接收到的物理层下行控制信令中的指示信 息指示需要发送带内 SRS,则确定需要发送带内 SRS,于是执行步骤 101;反之, 当接收到的物理层下行控制信令中的指示信息指示不需要发送带内 SRS, 则确 定不需要发送带内 SRS, 于是退出流程, 不执行步骤 101。 当然, 除了在现有的物理层下行控制信令中携带指示信息之外,也可以通 过新的物理层下行控制信令对是否需要发送带内 SRS进行指示。
102、 计算发射天线端口数量 与当前传输的 DMRS的层数 N^的差值
Ntx - Nrank , 将该差 作为需要发送的带内 SRS的数量 Nsss , 即 N N - N ·
103、 根据带内 SRS的数量 Λ ^发送带内 SRS给接收端, 以便接收端根据接 收到的带内 SRS , 结合当前传输的 DMRS进行信道估计。 例如, 具体可以如下:
S1、根据需要发送的带内 SRS的数量从设定的码本中选择预编码矩阵 Psss; 比如, 可以接收携带有选择规则的下行控制信令, 然后根据带内 SRS的数 量按照接收到的选择规则选择预编码矩阵 Psss
或者, 也可以根据带内 SRS的数量, 按照预设的选择规则来选择预编码矩 阵 P 。
其中, 该选择规则可以直接指示选择哪个预编码矩阵,也可以是指示一种 映射规则, 比如, 每一个 DMRS的预编码矩阵都预先定义好一个配对的 SRS的 预编码矩阵, 这样, 在获知 DMRS使用哪一个预编码矩阵 PDMSS后, 就可以根据 映射规则选择出相应的 SRS的预编码矩阵 PSRS
S2、 根据需要发送的带内 SRS的数量选择 SRS , 并将选择的 SRS进行正交 化;
其中,正交化的方式有多种,比如,采用循环移位正交化方式将选择的 SRS 进行正交化, 等等, 具体可参见现有技术。
在采用循环移位正交化方式将选择的 SRS进行正交化时, 需要先确定循环 移位,然后根据确定的循环移位将选择的 SRS进行正交化。所谓确定循环移位, 指的是具体使用哪些循环移位, 循环移位的数量与带内 SRS的数量相同, 即循 环移位的数量为 NSRS
其中, 确定循环移位可以采用多种方式, 例如, 可以利用下行控制信令进 行通知的方式、或者利用预设规则进行计算的方式、或者事先指定的方式来确 定循环移位, 等等; 具体如下:
( 1 )接收端设备通过下行控制信令进行通知的方式: 即接收用于指示循 环移位的下行控制信令, 比如在调度 SRS的子帧的下行控制信令中进行说明使 用哪几个循环移位。
( 2 ) 利用设定的规则进行计算的方式: 根据设定的规则计算当前可以使 用的循环移位, 例如根据当前 DMRS配置的循环移位来计算 SRS使用哪几个循 环移位。
( 3 )预先设定的方式: 即事先通过高层信令配置关于发送 Nsss个 SRS时使 用哪几个循环移位。
S3、 用选择的预编码矩阵对正交化后的 SRS进行预编码, 得到预编码后 SRS; 预编码的具体操作可可参见现有技术, 在此不再赘述。
S4、 通过各个天线端口在带内发送预编码后 SRS给接收端设备。
例如, 可以通过各个天线端口, 在发送 DMRS的 SC - FDMA符号上发送预 编码后 SRS; 或者, 也可以通过各个天线端口, 在用于传送数据的 SC - FDMA 符号上发送预编码后 SRS, 比如可以将原先用于传送数据的一个 SC - FDMA符 号保留用来发送预编码后 SRS。
其中, 步骤 S1和 S2的执行可以不分先后。
由于 DMRS和 SRS都是 RS, 所以接收端设备在接收到 SRS后, 可以将接收 到的带内 SRS和 DMRS结合起来, 进行信道估计。 由于 SRS的数量 Λ ^为 Ntx -Nmnk , 而 DMRS的数量为 Nra 所以二者的和为 - ^ + ^ = , 即总 的 RS的数量为 Nfa , 可以满足 "估计出完整信道信息" 的条件: 发送的 RS个数 要与发射天线端口数 Nfa相等, 所以, 在本实施例中, 虽然只发送了 Nfa -NraA个 带内 SRS, 但仍然可以估计出完整的信道信息。
由上可知, 本实施例采用将发射天线端口数量 Ntx与当前传输的 DMRS的 tNmnk的差作为需要发送的带内 SRS的数量 NSRS发送带内 SRS给接收端设 备, 然后在接收端设备将带内 SRS与 DMRS相结合进行信道估计, 在本发明的 方案中, 虽然只发送了 Nfa -Nra^个带内 SRS , 但由于同时还发送了 Nra^个
DMRS, 所以对于接收端设备来说, RS的个数还是与发射天线端口数 相等, 所以,本实例所提供的方案相对于现有技术需要发送 Nfa个带内 SRS而言,可以 用更小的开销 (即只需发送 Nfa-Nra^个带内 SRS)估计出完整的信道信息。 实施例二、
本发明实施例将从接收端设备的角度进行描述,该接收端设备可以为网络 侧设备, 比如基站或服务器等等, 或者也可以为其他可以接收上行链路数据的 设备。
一种信道估计方法, 包括: 接收发送端发送的带内 SRS, 该带内 SRS的数 量为发送端设备的发射天线端口数量与当前传输的 DMRS的层数的差;根据接 收到的带内 SRS与当前传输的 DMRS进行信道估计。
参见图 2, 具体流程可以如下:
201、 接收发送端设备发送的带内 SRS, 其中, 带内 SRS的数量 Nsss为发送 端设备的发射天线端口数量 Nfa与当前传输的 DMRS的层数 Nmnk之差, 即
N = N -N ■,
202、 根据接收到的带内 SRS与当前传输的 DMRS进行信道估计。
由于 DMRS和 SRS都是 RS, 其中, 的数量 NSRS为 Nix-Nmnk , 而 DMRS 的数量为 Nra^, 所 、二者 ^和为 Ntx-Nmnk+Nmnk =Ntx, 即总的 RS的数量为 Nfa, 所以, 在本实施例中, 虽然只接收了 Nfa-NraA个带内 SRS, 但由于同时还接收 了 NraA个 DMRS, 所以仍可以满足接收的 RS个数要与发射天线端口数 Nfa相等 的条件, 所以可以估计出完整的信道信息。
其中, 进行信道估计的算法可以有多种, 例如, 可以对当前传输的 DMRS 和接收到的带内 SRS分别进行去正交化, 得到两个估计矩阵, 然后联立这两个 估计矩阵并进行求解, 以估计出完整的信道矩阵信息。 具体可以如下:
由于发送端设备发送了 NraA个 DMRS, 所以接收端设备可以得到关于 DMRS的接收信号 DMRS (参见现有技术):
MRS HPDM?5 X ¾MRS + · 其中, ? DMRS为将 Nra^个 DMRS用不同的循环移位正交化后, 在每一个子载 波上, 得到的 DMRS向量, P 5为0^11½的预编码矩阵, H是一个 NfaXNra维的 矩阵, 表示完整的信道信息, ^为噪声。
由于发送端设备发送了 NSRS =Nfa-NraA个 SRS,所以接收端设备上可以得到 关于 SRS的接收信号 SRS
Figure imgf000010_0001
其中, RS为将 Wsss个 SRS用不同的循环移位正交化后,在每一个子载波上, 得到的 SRS, Psss为 SRS的预编码矩阵, H是一个 Nfa XNra维的矩阵, 表示完整 的信道信息, ^为噪声。
由于发送端设备在发送 DMRS和 SRS时, DMRS向量? DMRS与 SRS向量? SRS均 采用循环移位进行了正交化, 所以接收端设备在接收到 DMRS和 SRS后, 需要 对接收到的 DMRS和 SRS分别进行去正交化, 得到:
X RS― HPDMwS + ηι Xsss =HPSSS+ 2。 这里 X 5与 Xsss分别是 HP 5与 HPSSS的估计值。 而由于对于接收端设备 来说, DMRS的预编码矩阵1^皿和81½的预编码矩阵 Psss均是已知的, 所以若 不考虑噪声 和 , 则可以将两个矩阵方程分别写作线性方程组, 如下:
X =HP 5可以写成 个方程, 这些方程可以表示为:
X s,i,j = X ^5 1,2,···,Λ^, = 1,2,···,Λ^„Α)
XSRS =HPSSS可以写成 (Ntt- „ ^个方程, 这些方程可以表示为:
Figure imgf000010_0002
X Psus (i = 1,2,···, Nrx = 1,2,..., (Ntx - Nrank)) 这里 X^s,,,表示矩阵 的第 i行第 j列的数值; Χ 表示矩阵 Xs s的第 i 行第 j列的数值; 表示矩阵 H的第 i行; /βΜ^表示矩阵 ΡβΜβ5的第 j列; 表 示矩阵 Ps s的第 j列。 由于欲估计的信道矩阵 H中包含 Nra xNfa个未知量, 而现在 共有 Nrmk X Nrx +(Nlx- Nmnk ) Nrx = Nrx x Ntx个独立方程, 故联立方程即可以求解出 所有未知量。 从而得到完整的信道估计值, 具体的求解过程在此不再赘述。
需说明的是, 以上仅仅给出了估计方法的一种算法, 除此之外, 还可以采 用其他的算法, 在此不再列举。
由上可知, 本实施例采用将发射天线端口数量 Nfa与当前传输的 DMRS的 tNmnk的差作为需要发送的带内 SRS的数量 NSRS发送带内 SRS给接收端设 备, 然后在接收端设备将带内 SRS与 DMRS相结合进行信道估计, 在本发明的 方案中, 虽然接收端设备只接收了 Nfa - Nraii个带内 SRS , 但由于同时还接收了 Nra¾个 DMRS,所以对于接收端设备来说, RS的个数还是与发射天线端口数 相等,所以,本实例所提供的方案相对于现有技术需要发送 Nfa个带内 SRS而言, 可以用更小的开销估计出完整的信道信息。 实施例三、
根据实施例一和二所描述的方法, 以下将举例作进一步详细说明。
在本实施例中,将以发送端设备为终端、接收端设备为基站为例进行说明。 参见图 3 , 具体流程可以如下:
301、 当终端被调度, 需要传输数据时, 终端首先判断在此子帧内是否需 要发送带内 SRS , 如果需要, 则执行步骤 302, 否则, 如果不需要, 则流程结 束。
例如, 可以预先通过高层信令配置参数,表示在满足一些条件的时候需要 发送带内 SRS, 比如该终端每被调度 X次, 则发送一次带内 SRS, 等等。 或者, 也可以由基站下发物理层下行控制信令来指示是否需要发送带内 SRS
302、 终端获取初始信息, 该初始信息包括该发送端设备的发射天线端口 数量 Nfa和当前传输的 DMRS的层数 Nra¾ , 还可以包括当前传输的 DMRS所使用 的预编码矩阵 Ρβ 具体的获取方式可参见现有技术, 在此不再赘述。
303、 终端计算发送带内 SRS时所需要的参数, 如下:
( 1 ) 需要发送的带内 SRS的数量 Ns s , 即需要发送多少个 SRS;
由于 DMRS和 SRS都是 RS, 所以, 可以将 DMRS和 SRS结合起来作为信道 估计时所需的 RS,因为已经发送了 N ^个 DMRS ,所以,在此只需发送 Nfa - Nraii 个带内 SRS, 就可以满足估计出完整通道信息时所需要的条件: 发送的 RS个数 要与发射天线端口数 Nfa相等。 因此, 需要发送的带内 SRS的数量 N SRS _ Nix _ Nrank
( 2 )选择发送带内 SRS的预编码矩阵;
根据发送带内 SRS的数量 Ns s , 从设定的码本中, 比如从预编码矩阵列表 中选择一个预编码矩阵 VSRS , PSRS的维度为 NtxxNSRS
比如,可以通过在基站下发的下行控制信令中携带选择规则的方式或按照 预设的选择规则的方式来进行指示, 然后根据带内 SRS的数量按照选择规则选 择预编码矩阵 Ps s ;
其中, 该选择规则可以直接指示选择哪个预编码矩阵,也可以是指示一种 映射规则, 比如, 每一个 DMRS的预编码矩阵都预先定义好一个配对的 SRS的 预编码矩阵, 这样, 在获知 DMRS使用哪一个预编码矩阵 ΡβΜβ5后, 就可以根据 映射规则选择出相应的 SRS的预编码矩阵 PSRS
304、 终端根据需要发送的带内 SRS的数量选择 SRS , 即终端选择 Λ ^个 SRS , 并将选择的 SRS进行正交化; 其中, 正交化的方式有多种, 比如, 采用 循环移位正交化方式将选择的 SRS进行正交化, 等等, 具体可参见现有技术。
如果采用循环移位正交化方式将选择的 SRS进行正交化, 则需要采用 Ns s 个循环移位, 具体使用哪 NSRS个循环移位可以由下行控制信令进行通知的方式 来指定, 或者也可以利用预设规则进行计算的方式来确定, 或者, 还可以由高 层信令事进行先配置, 比如配置在发送 Λ ^个 SRS用哪几个循环移位, 等等。
305、 终端用选择的预编码矩阵 Ps s对正交化后的 SRS进行预编码, 得到预 编码后 SRS; 预编码的具体操作可可参见现有技术, 在此不再赘述。
306、 终端通过各个天线端口在带内发送预编码后 SRS给基站。 例如
( 1 )终端可以通过各个天线端口, 在发送 DMRS的 SC - FDMA符号上发 送预编码后 SRS给基站; 或者,
( 2 )终端也可以通过各个天线端口, 在用于传送数据的 SC - FDMA符号 上发送预编码后 SRS给基站, 比如, 可以将原来用以传送数据的一个 SC - FDMA符号保留用来传送预编码后 SRS。
307、 基站在接收到终端发送的带内 SRS后, 即接收到步骤 306中发送的预 编码后 SRS后,将接收到的带内 SRS与当前传输的 DMRS相结合进行信道估计。 例如, 可参见实施例二中所列举的算法。
由上可知, 本实施例的终端采用将发射天线端口数量 Nfa与当前传输的
DMRS的层数 Nraii的差作为需要发送的带内 SRS的数量 NSRS发送带内 SRS给基 站,然后由基站将带内 SRS与 DMRS相结合进行信道估计,在本发明的方案中, 虽然终端只发送了 Ntx - Nmk个带内 SRS , 但由于同时还发送了 Nmnk个 DMRS , 所以对于基站来说, RS的个数还是与发射天线端口数 相等, 所以, 本实例 所提供的方案相对于现有技术需要发送 Nfa个带内 SRS而言,可以用更小的开销 估计出完整的信道信息。 实施例四、
为了更好地实施以上方法, 本发明实施例还相应地提供一种发送端设备, 参见图 4a, 该发送端设备可以包括获取单元 401、运算单元 402和发送单元 403; 获取单元 401 , 用于当确定需要发送带内测量参考信号 SRS时, 获取发射 天线端口数量和当前传输的 DMRS的层数;
其中, 可以根据设置的参数确定需要发送带内 SRS , 或者, 也可以根据物 理层下行控制信令来确定需要发送带内 SRS。
运算单元 402,用于计算获取单元 401获取到的发射天线端口数量与当前传 输的 DMRS的层数的差值, 将该差值作为需要发送的带内 SRS的数量; 例如, 如果发射天线端口数量为 Nfa , 当前传输的 DMRS的层数为 Nraii , 而需要发送的 带内 SRS的数量为 NSRS , 则需要发送的带内 SRS的数量可以表示为
N SRS _ Nix _ Nrank
发送单元 403 , 用于根据运算单元 402计算得到的需要发送的带内 SRS的数 量发送带内 SRS给接收端设备, 以便接收端设备根据当前传输的 DMRS和接收 到的带内 SRS进行信道估计。
其中, 发送单元 403可以包括选择子单元 4031、 正交化子单元 4032、 预编 码子单元 4033和发送子单元 4034, 参见图 4b;
选择子单元 4031 , 用于根据运算单元 402计算得到的需要发送的带内 SRS 的数量从设定的码本中选择预编码矩阵; 比如, 该选择子单元 4031具体可以用 于接收携带有选择规则的下行控制信令, 然后根据带内 SRS的数量按照接收到 的选择规则从设定的码本中选择预编码矩阵 Ps s; 或者, 也可以根据带内 SRS 的数量, 按照设定的选择规则从协议预定义的码本中选择预编码矩阵 Ps s
正交化子单元 4032 , 用于根据运算单元 402计算得到的需要发送的带内
SRS的数量选择 SRS , 并将选择的 SRS进行正交化; 其中, 正交化的方式有多 种, 比如, 采用循环移位正交化方式将选择的 SRS进行正交化, 等等, 具体可 参见现有技术。
如果采用循环移位正交化方式将选择的 SRS进行正交化, 则需要采用 NSRS 个循环移位, 具体使用哪 NSRS个循环移位可以由下行控制信令进行通知的方式 来指定, 或者也可以利用预设规则进行计算的方式来确定, 或者, 还可以由高 层信令事进行先配置, 比如配置在发送 Λ ^个 SRS用哪几个循环移位, 等等。
预编码子单元 4033 ,用于用选择子单元 4031选择的预编码矩阵对经过正交 化子单元 4032正交化后的 SRS进行预编码, 得到预编码后 SRS;
发送子单元 4034, 用于通过各个天线端口在带内发送预编码子单元 4033 预编码后 SRS给接收端设备。 例如, 可以通过各个天线端口, 在发送 DMRS的 SC - FDMA符号上发送预编码后 SRS给接收端设备; 或者, 也可以通过各个天 线端口,在用于传送数据的的 SC - FDMA符号上发送预编码后 SRS给接收端设 备,比如可以将原先用于传送数据的一个 SC - FDMA符号保留用来发送预编码 后 SRS。
以上各个单元的具体实施可参见前面实施例, 在此不再赞述。
该发送端设备可以为终端, 比如手机或笔记本电脑等等, 或者也可以为其 他可以发送上行链路数据的设备。 端口数量 Ntx与当前传输的 DMRS的层数 Nraii , 然后由运算单元 402将发射天线 端口数量 Ntx与当前传输的 DMRS的层数 Nraii的差作为需要发送的带内 SRS的 数量 NSRS , 由发送单元 403将 NSRS个 SRS发送给基站, 然后由基站将带内 SRS与 DMRS相结合进行信道估计, 在本发明的方案中, 虽然只发送了 Nfa - Nraii个带 内 SRS, 但由于同时还发送了 Nra¾个 DMRS, 所以对于基站来说, RS的个数还 是与发射天线端口数 Nfa相等, 所以, 本实例所提供的方案相对于现有技术需 要发送 Nfa个带内 SRS而言, 可以用更小的开销估计出完整的信道信息。 实施例五、
相应地, 本发明实施例还提供一种接收端设备, 参见图 5 , 该接收端设备 包括接收单元 501和估计单元 502; 接收单元 501, 用于接收发送端设备发送的带内测量参考信号 SRS, 其中, 带内 SRS的数量为发送端设备的发射天线端口数量与当前传输的解调参考信 号 DMRS的层数的差; 例如, 如果发射天线端口数量为 Nfa, 当前传输的 DMRS 的层数为 Nraii, 而需要发送的带内 SRS的数量为 Ns s , 则需要发送的带内 SRS 的数量可以表示为 NSRS = Ntx-Nmnk。 估计单元 502, 用于根据当前传输的 DMRS与接收单元 501接收到的带内 SRS进行信道估计。 去正交化单元, 用于对接收到的当前传输的 DMRS与接收单元 501接收到 的带内 SRS分别进行去正交化, 得到两个估计矩阵;
估计子单元,用于根据去正交化单元得到的两个估计矩阵估计出完整的信 道矩阵信息。
以上各个单元的具体实施可参见前面实施例。
该接收端设备具体可以为网络侧设备, 比如基站或服务器等等, 或者也可 以为其他可以接收上行链路数据的设备。
由于 DMRS和 SRS都是 RS, 其中, 的数量 NSRS为 Nix-Nmnk , 而 DMRS 的数量为 Nraii, 二者^和为 Ntx-Nmnk +Nmnk =Ntx, 即总的 RS的数量为 Nfa, 所 以, 在本实施例中, 虽然只发送了 Nfa-Nraii个带内 SRS, 但仍可满足发送的 RS 个数要与发射天线端口数 Ntx相等的条件, 所以可以估计出完整的信道信息。
由上可知, 本实施例的接收端设备的接收单元 501可以接收带内 SRS, 其 中, 该带内 SRS的数量为发射天线端口数量 Ntx与当前传输的 DMRS的层数 Nraii 的差, 然后由估计单元 502将接收到的带内 SRS与 DMRS相结合进行信道估计, 在本发明的方案中, 虽然只接收到 Nfa-Nraii个带内 SRS, 但由于同时还接收了 Nra¾个 DMRS,所以对于接收端设备来说, RS的个数还是与发射天线端口数 相等,所以,本实例所提供的方案相对于现有技术需要发送 Nfa个带内 SRS而言, 可以用更小的开销估计出完整的信道信息。 实施例六、
相应地, 本发明实施例还提供一种通信系统, 包括本发明实施例提供的任 一种发送端设备和实施例提供的任一种接收端设备;
例如, 如图 6所示, 该通信系统包括发送端设备 400和接收端设备 500; 其中, 发送端设备 400, 用于当确定需要发送带内 SRS时, 获取发射天线 端口数量 NTX和当前传输的 DMRS的层数 NRAII ,计算获取到的发射天线端口数量 NFA与当前传输的 DMRS的层数 NRAII的差值, 将该差值作为需要发送的带内 SRS 的数量 NS S , ? NSRS = NTX - NMK , 然后根据带内 SRS的数量 Λ ^发送带内 SRS给 接收端设备 500;其中,根据带内 SRS的数量 NSRS发送带内 SRS给接收端设备 500 具体可以如下:
( 1 )根据带内 SRS的数量 NS S ,从预编码矩阵列表中选择一个预编码矩阵 P , Ps«s的维度为 xNS S ;
( 2 )选择 Λ ^个 SRS , 并将选择的 SRS进行正交化;
( 3 )用选择的预编码矩阵 Ps s对正交化后的 SRS进行预编码, 得到预编码 后 SRS;
( 4 )通过各个天线端口在带内发送预编码后 SRS给基站, 发送时可以在 发送的 DMRS的 SC - FDMA符号上进行发送,也可以在预留的 SC - FDMA符号 上进行发送。
接收端设备 500, 用于接收发送端设备 400发送的带内 SRS, 并根据当前传 输的 DMRS与接收到的带内 SRS进行信道估计。
以上单元的具体实施可参见前面实施例, 在此不再赘述。
由上可知, 本实施例所提供的通信系统的发送端设备 400采用将发射天线 端口数量 NTX与当前传输的 DMRS的层数 NRAII的差作为需要发送的带内 SRS的 数量 NSRS发送带内 SRS给接收端设备 500, 然后在接收端设备 500将带内 SRS与 DMRS相结合进行信道估计, 在本发明的方案中, 虽然接收端设备 500只接收 了 - NRAII个带内 SRS, 但由于同时还接收了 NRAII个 DMRS, 所以对于接收端 设备 500来说, RS的个数还是与发射天线端口数 相等, 所以, 本实例所提供 的方案相对于现有技术需要发送 NFA个带内 SRS而言,可以用更小的开销估计出 完整的信道信息。 本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步 骤是可以通过程序来指令相关的硬件来完成,该程序可以存储于一计算机可读 存储介质中, 存储介质可以包括: 只读存储器(ROM, Read Only Memory ), 随机存取记忆体(RAM, Random Access Memory ) , 磁盘或光盘等。
以上对本发明实施例所提供的一种信道估计方法、装置和系统进行了详细 施例的说明只是用于帮助理解本发明的方法及其核心思想; 同时,对于本领域 的一般技术人员,依据本发明的思想,在具体实施方式及应用范围上均会有改 变之处, 综上所述, 本说明书内容不应理解为对本发明的限制。

Claims

权 利 要 求
1、 一种信道估计方法, 其特征在于, 包括:
当确定需要发送带内测量参考信号 SRS时, 获取发射天线端口数量和当前 传输的解调参考信号 DMRS的层数;
计算所述发射天线端口数量与所述当前传输的 DMRS的层数的差值,将所 述差值作为需要发送的带内 SRS的数量;
根据所述需要发送的带内 SRS的数量发送带内 SRS给接收端设备, 以便所 述接收端设备根据当前传输的 DMRS以及接收到的带内 SRS进行信道估计。
2、根据权利要求 1所述的方法,其特征在于,所述根据需要发送的带内 SRS 的数量发送带内 SRS给接收端设备, 包括:
根据所述需要发送的带内 SRS的数量从设定的码本中选择预编码矩阵; 根据所述需要发送的带内 SRS的数量选择 SRS , 并将选择的 SRS进行正交 化;
用所述选择的预编码矩阵对所述正交化后的 SRS进行预编码, 得到预编码 后的 SRS;
通过各个天线端口在带内发送预编码后的 SRS给接收端设备。
3、根据权利要求 2所述的方法,其特征在于,所述根据需要发送的带内 SRS 的数量选择预编码矩阵, 包括:
接收携带有选择规则的下行控制信令,根据所述需要发送的带内 SRS的数 量按照所述选择规则从设定的码本中选择预编码矩阵; 或者,
根据所述需要发送的带内 SRS的数量,按照设定的选择规则从设定的码本 中选择预编码矩阵。
4、 根据权利要求 2或 3所述的方法, 其特征在于, 所述将选择的 SRS进行 正交化包括:
采用循环移位正交化方式将选择的 SRS进行正交化。
5、 根据权利要求 4中所述的方法, 其特征在于, 所述采用循环移位正交化 方式将选择的 SRS进行正交化, 包括:
通过接收用于指示循环移位的下行控制信令、或者通过设定的规则进行计 算的方式来确定循环移位、 或者通过预先设定的方式来确定循环移位; 根据确定的循环移位将选择的 SRS进行正交化。
6、 根据权利要求 2至 5任一权利要求所述的方法, 其特征在于, 所述通过 各个天线端口在带内发送预编码后 SRS给接收端设备, 包括:
通过各个天线端口,在发送 DMRS的单载波频分复用 SC - FDMA符号上发 送预编码后 SRS; 或者,
通过各个天线端口, 在用于传送数据的 SC - FDMA符号上发送预编码后 SRS。
7、 根据权利要求 1至 6中任一项权利要求所述的方法, 其特征在于, 所述 确定需要发送带内 SRS, 包括:
根据设置的配置参数确定需要发送带内 SRS; 或者,
根据物理层下行控制信令中携带的信息来确定需要发送带内 SRS。
8、 一种信道估计方法, 其特征在于, 包括:
接收发送端设备发送的带内测量参考信号 SRS, 所述带内 SRS的数量为所 述发送端设备的发射天线端口数量与当前传输的解调参考信号 DMRS的层数 的差;
根据接收到的带内 SRS与当前传输的 DMRS进行信道估计。
9、 根据权利要求 8所述的方法, 其特征在于, 所述根据接收到的带内 SRS 与当前传输的 DMRS进行信道估计, 包括:
对当前传输的 DMRS与所述接收到的带内 SRS分别进行去正交化, 得到两 个估计矩阵;
根据所述两个估计矩阵估计出完整的信道矩阵信息。
10、 一种发送端设备, 其特征在于, 包括:
获取单元, 用于当确定需要发送带内测量参考信号 SRS时, 获取发射天线 端口数量和当前传输的解调参考信号 DMRS的层数;
运算单元,用于计算所述获取单元获取到的所述发射天线端口数量与所述 当前传输的 DMRS的层数的差值,将所述差值作为需要发送的带内 SRS的数量; 发送单元, 用于根据所述运算单元计算得到的需要发送的带内 SRS的数量 发送带内 SRS给接收端设备, 以便所述接收端设备根据所述当前传输的 DMRS 以及接收到的带内 SRS进行信道估计。
11、根据权利要求 10所述的发送端设备,其特征在于,所述发送单元包括: 选择子单元, 用于根据所述运算单元计算得到的需要发送的带内 SRS的数 量从设定的码本中选择预编码矩阵;
正交化子单元, 用于根据所述运算单元计算得到的需要发送的带内 SRS的 数量选择 SRS, 并将选择的 SRS进行正交化;
预编码子单元, 用于用所述选择子单元选择的预编码矩阵对正交化后的 SRS进行预编码, 得到预编码后 SRS;
发送子单元,用于通过各个天线端口在带内发送所述预编码子单元预编码 后 SRS给接收端设备。
12、 根据权利要求 11所述的发送端设备, 其特征在于,
所述选择子单元,具体用于接收携带有选择规则的下行控制信令,根据所 述需要发送的带内 SRS的数量按照所述选择规则从设定的码本中选择预编码 矩阵; 或者, 根据所述需要发送的带内 SRS的数量, 按照设定的选择规则从设 定的码本中选择预编码矩阵。
13、 一种接收端设备, 其特征在于, 包括:
接收单元, 用于接收发送端设备发送的带内测量参考信号 SRS, 所述带内 SRS的数量为所述发送端的发射天线端口数量与当前传输的解调参考信号 DMRS的层数的差;
估计单元, 用于根据当前传输的 DMRS与所述接收单元接收到的带内 SRS 进行信道估计。
14、根据权利要求 13所述的接收端设备,其特征在于,所述估计单元包括: 去正交化单元,用于对接收到的当前传输的 DMRS与接收单元接收到的带 内 SRS分别进行去正交化, 得到两个估计矩阵;
估计子单元,用于根据所述去正交化单元得到的两个估计矩阵估计出完整 的信道矩阵信息。
15、 一种通信系统, 其特征在于, 包括权利要求 10至 12中任一项所述的 发送端设备和权利要求 13或 14所述的接收端设备。
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