CN106961401B - Channel estimation method and device - Google Patents

Channel estimation method and device Download PDF

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Publication number
CN106961401B
CN106961401B CN201610018689.XA CN201610018689A CN106961401B CN 106961401 B CN106961401 B CN 106961401B CN 201610018689 A CN201610018689 A CN 201610018689A CN 106961401 B CN106961401 B CN 106961401B
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antenna
grouping
end device
sub
sending end
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CN106961401A (en
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吴晔
刘瑾
毕晓艳
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention discloses a channel estimation method and a channel estimation device, relates to the technical field of communication, and can provide a notification mode applied to antenna array grouping. The method of the embodiment of the invention comprises the following steps: a sending end device receives an antenna grouping indication sent by a receiving end device, wherein the antenna grouping indication is used for indicating the sending end device to divide an antenna array of the sending end device into a plurality of antenna sub-arrays according to an antenna grouping pattern; the transmitting end device divides the antenna array into the plurality of antenna sub-arrays according to the antenna grouping pattern. The invention is suitable for a network communication system.

Description

Channel estimation method and device
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a channel estimation method and apparatus.
Background
With the development of communication technology, in order to implement spatial multiplexing, generally, after receiving a pilot frequency sent by a sending end device of data such as a base station, a receiving end device of data such as a terminal performs CSI (Channel state information) measurement, obtains a precoding vector through calculation, quantizes the precoding vector, obtains a PMI (precoding matrix indicator) and an RI (rank indicator) corresponding to a precoding codebook, and sends an RMI and an RI to the sending end device, so as to ensure that the sending end device obtains the CSI and implement concurrence of multi-stream data. In the process of generating precoding, the receiving end device usually needs to perform eigenvalue decomposition on a channel matrix or an autocorrelation matrix of a channel, and the complexity of performing eigenvalue decomposition is approximately 3 times of the number of antenna ports.
With the subsequent Evolution of LTE/LTE-a (Long Term Evolution/Long Term Evolution-Advanced, 3GPP Long Term Evolution/3 GPP subsequent Long Term Evolution), the number of antennas of the transmitting end device is also in a rapidly increasing state. Therefore, when the method is used to generate precoding, the calculation amount of the eigenvalue decomposition process is often large due to the existence of a large number of antenna ports in the sending end device, so that the complexity of the eigenvalue decomposition process is increased, and the difficulty of implementing spatial multiplexing is increased. Therefore, the application date is 2015, 5, month and 29, the international application number is "PCT/CN 2015/079290", the invention name is "channel information feedback method and apparatus of antenna array", and a technical solution for reducing the computational complexity of the transmitting end device by grouping antenna arrays is proposed. Although the technical scheme can effectively solve the problem of high difficulty in realizing spatial multiplexing caused by high complexity in the process of decomposing the characteristic values, the current process of reporting the grouping information of the antenna array is not flexible enough, and therefore a notification mode applied to antenna array grouping is needed to be provided.
Disclosure of Invention
The embodiment of the invention provides a channel estimation method and a channel estimation device, which can provide a notification mode applied to antenna array grouping.
In order to achieve the purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a channel estimation method, including:
a sending end device receives an antenna grouping indication sent by a receiving end device, wherein the antenna grouping indication is used for indicating the sending end device to divide an antenna array of the sending end device into a plurality of antenna sub-arrays according to an antenna grouping pattern;
the transmitting end device divides the antenna array into the plurality of antenna sub-arrays according to the antenna grouping pattern.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the method further includes:
the sending end equipment sends a channel estimation instruction to the receiving end equipment;
the sending end equipment receives channel information fed back by the receiving end equipment based on the channel estimation indication, wherein the channel information comprises sub-channel information of each antenna sub-array in the plurality of antenna sub-arrays;
and the sending end equipment calculates the channel information corresponding to the antenna array based on the channel information fed back by the receiving end equipment.
With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, before the sending end device receives an antenna packet indication sent by a receiving end device, the method further includes:
and the sending end equipment sends an antenna grouping command to the receiving end equipment, wherein the antenna grouping command is used for indicating the receiving end equipment to send the antenna grouping indication.
In a second aspect, an embodiment of the present invention provides a channel estimation method, including:
the receiving end equipment determines an antenna grouping pattern;
and the receiving end equipment sends an antenna grouping instruction to the sending end equipment, wherein the antenna grouping instruction is used for indicating the sending end equipment to divide the antenna array of the sending end equipment into a plurality of antenna sub-arrays according to the antenna grouping pattern.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the method further includes:
the receiving end equipment receives a channel estimation indication sent by the sending end equipment;
the receiving end device feeds back channel information based on the channel estimation indication, so that the sending end device calculates channel information corresponding to the antenna array based on the channel information fed back by the receiving end device, and the fed back channel information includes sub-channel information of each antenna sub-array in the multiple antenna sub-arrays.
With reference to the second aspect, or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, before the receiving end device determines the antenna grouping pattern, the method further includes:
the receiving end equipment receives an antenna grouping command sent by the sending end equipment;
the receiving end device determines the antenna grouping pattern, including:
the receiving end device determines the antenna grouping pattern based on the antenna grouping command.
In a third aspect, an embodiment of the present invention provides a channel estimation apparatus, including:
the receiving module is used for receiving an antenna grouping instruction sent by receiving end equipment, wherein the antenna grouping instruction is used for instructing the sending end equipment to divide an antenna array of the sending end equipment into a plurality of antenna sub-arrays according to an antenna grouping pattern;
a processing module for dividing the antenna array into the plurality of antenna sub-arrays according to the antenna grouping pattern.
With reference to the third aspect, in a first possible implementation manner of the third aspect, the apparatus further includes:
a sending module, configured to send a channel estimation indication to the receiving end device;
the receiving module is further configured to receive channel information fed back by the receiving end device based on the channel estimation indication, where the channel information includes sub-channel information of each antenna sub-array in the multiple antenna sub-arrays;
the processing module is further configured to calculate channel information corresponding to the antenna array based on the channel information fed back by the receiving end device.
With reference to the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the sending module is further configured to send, by the sending end device, an antenna grouping command to the receiving end device, where the antenna grouping command is used to instruct the receiving end device to send the antenna grouping instruction.
In a fourth aspect, an embodiment of the present invention provides a channel estimation apparatus, including:
a processing module for determining an antenna grouping pattern;
and the transmitting module is used for transmitting an antenna grouping instruction to transmitting end equipment, wherein the antenna grouping instruction is used for instructing the transmitting end equipment to divide the antenna array of the transmitting end equipment into a plurality of antenna sub-arrays according to the antenna grouping pattern.
With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the apparatus further includes:
a receiving module, configured to receive a channel estimation indication sent by the sending end device;
the sending module is further configured to feed back channel information based on the channel estimation indication, so that the sending end device calculates channel information corresponding to the antenna array based on the channel information fed back by the receiving end device, where the fed back channel information includes sub-channel information of each antenna sub-array in the multiple antenna sub-arrays.
With reference to the fourth aspect or the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the receiving module is further configured to receive an antenna grouping command sent by the sending end device;
the processing module is specifically configured to determine the antenna grouping pattern based on the antenna grouping command.
In the channel estimation method and apparatus provided in the embodiments of the present invention, the receiving end device determines an antenna grouping pattern and sends an antenna grouping instruction to the sending end device, and the sending end device receives the antenna grouping instruction sent by the receiving end device and divides the antenna array into a plurality of antenna sub-arrays according to the antenna grouping pattern. The antenna grouping indication is used for indicating the sending end equipment to divide an antenna array of the sending end equipment into a plurality of antenna sub-arrays according to an antenna grouping pattern. Compared with the prior art that the sending end equipment determines the CSI by acquiring the PMIs and the RIs corresponding to the precodes which are generated by the receiving end equipment and used for representing all the antenna ports, the method can divide the antenna ports into a plurality of antenna sub-arrays by grouping the antenna ports which form the antenna array, so that the receiving end equipment generates the precodes for each antenna sub-array, feeds back the PMIs and the RIs corresponding to the precodes of each antenna sub-array to the sending end equipment, and then determines the CSI corresponding to each antenna sub-array after the sending end equipment receives the PMIs and the RIs corresponding to each antenna sub-array, thereby obtaining the CSI corresponding to all the antenna sub-arrays. In addition, in the process of precoding generation, the antenna ports forming the antenna array are divided into antenna sub-arrays. Along with the great increase of the number of the antennas, the complexity of the characteristic value decomposition is approximate to the sum of 3 power of the number of the antenna ports of each antenna subarray and is far less than the 3 power of the number of all the antenna ports, so that the problem of high difficulty in realizing spatial multiplexing caused by high complexity of the characteristic value decomposition process is solved, and meanwhile, a notification mode applied to antenna array grouping is provided, so that the grouping information of the antenna array is more flexible in the reporting process.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a channel estimation method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an antenna array grouping according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another antenna array grouping provided by the embodiment of the present invention;
fig. 4 is a schematic diagram of an antenna array according to an embodiment of the present invention;
fig. 5 is a schematic diagram of another antenna array grouping provided by the embodiment of the present invention;
fig. 6 is a schematic performance diagram of an antenna port according to an embodiment of the present invention under both grouping and non-grouping conditions;
fig. 7 is a flowchart of another channel estimation method according to an embodiment of the present invention;
fig. 8 is a flowchart of another channel estimation method according to an embodiment of the present invention;
fig. 9 is a signaling interaction diagram of a channel estimation method according to an embodiment of the present invention;
fig. 10 is a signaling interaction diagram of another channel estimation method according to an embodiment of the present invention;
fig. 11 is a flowchart of another channel estimation method according to an embodiment of the present invention;
fig. 12 is a flowchart of another channel estimation method according to an embodiment of the present invention;
fig. 13 is a flowchart of another channel estimation method according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of a channel estimation device according to an embodiment of the present invention;
fig. 15 is a schematic structural diagram of another channel estimation apparatus according to an embodiment of the present invention;
fig. 16 is a schematic structural diagram of a sending-end device according to an embodiment of the present invention;
fig. 17 is a schematic structural diagram of a receiving end device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention can be used for a network communication system, and the network communication system is provided with a sending end device of data such as a base station and a receiving end device of data such as a terminal. The sending end device may send a downlink signaling to the terminal to trigger the receiving end device to send an Antenna Grouping indication to the sending end device periodically or aperiodically, where the Antenna Grouping indication may specifically carry an Antenna Grouping pattern identifier, and the Antenna Grouping pattern identifier may specifically include GN (Antenna Port Grouping Number, the Number of Antenna Port groups) + GPI (Antenna Port Grouping pattern Index, an identifier of a Grouping mode of an Antenna Port). And under the precondition of GN and GPI determination, according to the divided antenna sub-arrays, the receiving end equipment sends the sub-channel information of each sub-array to the sending end equipment so that the sending end equipment can obtain CSI and realize spatial multiplexing according to the CSI, wherein the sub-channel information can specifically carry PMI and RI.
An embodiment of the present invention provides a channel estimation method, as shown in fig. 1, where the method is executed by a sending end device, and the method includes:
101. the sending end equipment receives the antenna grouping indication sent by the receiving end equipment.
The antenna grouping indication is used for indicating the sending end equipment to divide an antenna array of the sending end equipment into a plurality of antenna sub-arrays according to an antenna grouping pattern.
The antenna grouping indication may specifically carry an antenna grouping pattern identifier, where the antenna grouping pattern identifier may specifically include GN + GPI, where GN is the number of antenna arrays, which are divided into antenna sub-arrays, corresponding to the antenna grouping pattern, and the antenna arrays are composed of a plurality of antenna ports. It should be noted that, the antenna ports constituting the antenna array may be divided into several ways, for example: firstly, determining to divide the antenna array into 4 antenna sub-arrays, wherein the number of antenna ports included in each antenna sub-array is the same, and then determining GPIs corresponding to each division mode for dividing the antenna array into 4 antenna sub-arrays. That is, after the number of divided antenna sub-arrays is determined, since the antenna array may have multiple possible division modes, in the embodiment of the present invention, when GN is equal to P, the antenna array may have Q division modes, and GPI sent by the receiving end device to the sending end device may be specifically X. Wherein Q is usually an integer of 0 or more, and X is any of 0 to Q-1. That is to say, the receiving end device feeds back specific values of GN and GPI to the sending end device by feeding back P + X to the sending end device, that is, feeds back the antenna grouping pattern identifier to the sending end device.
In order to ensure that the sending end device can determine the grouping condition of the antenna ports forming the antenna array according to GN + GPI fed back by the receiving end device, in an implementation manner of the embodiment of the present invention, the sending end device may preset a grouping mode, that is, preset a specific grouping mode of the antenna ports under the condition that GN + GPI is determined. The grouping mode comprises the corresponding relation between all antenna sub-arrays and the antenna ports, and the number of all antenna sub-arrays is the same as GN.
For example: as shown in fig. 2, the antenna ports of 64 non-grouped transmitting end devices are labeled with reference numerals 0 to 63, respectively. When GN is 4, the sending end device may preset packet modes of 4 antenna ports, which are GPI ═ 0, GPI ═ 1, GPI ═ 2, and GPI ═ 3, respectively. When GPI is 0, the antenna array may be specifically divided into: antenna subarray 1 corresponds to antenna ports 0 to 7 and antenna ports 16 to 23, antenna subarray 2 corresponds to antenna ports 8 to 15 and antenna ports 24 to 31, antenna subarray 3 corresponds to antenna ports 32 to 39 and antenna ports 48 to 55, and antenna subarray 4 corresponds to antenna ports 40 to 47 and antenna ports 56 to 63; when GPI is 1, the antenna array can be specifically divided into: antenna sub-array 1 corresponds to antenna ports 0 to 7, antenna ports 16 to 19, antenna ports 32 to 35, and antenna ports 48 to 51, antenna sub-array 2 corresponds to antenna ports 8 to 11, antenna ports 24 to 27, antenna ports 40 to 43, and antenna ports 56 to 59, antenna sub-array 3 corresponds to antenna ports 4 to 7, antenna ports 20 to 23, antenna ports 36 to 39, and antenna ports 52 to 55, and antenna sub-array 4 corresponds to antenna ports 12 to 15, antenna ports 28 to 31, antenna ports 44 to 47, and antenna ports 60 to 63; when GPI is 2, as shown in fig. 3; when GPI is 3, this is shown in fig. 4. It should be noted that, the grouping mode corresponding to the antenna ports is not limited to the above manner, and the specific grouping mode is not specifically limited in the embodiment of the present invention, and the number of the antenna ports included in each antenna sub-array may be the same, partially different, or completely different.
It should be noted that the grouping mode of the antenna ports, i.e., the manner of dividing the antenna array formed by the antenna ports into antenna sub-arrays, is transparent to the receiving end device, that is, the receiving end device does not need to care about the specific inclusion relationship between the antenna array and the antenna sub-arrays. In order to ensure that the CSI acquired by the transmitting end device is accurate and error-free, it is required to ensure that no repeated antenna elements exist between each antenna subarray, and after the antenna array is divided into a plurality of antenna subarrays, no antenna elements which are not divided do not exist. Wherein each antenna element may be composed of two antennas. In the embodiment of the present invention, since the GN may be preset by the sending end device, and the GPI may also be preset by the sending end device after the GN is determined, in order to simplify the process of acquiring the CSI, the number of antenna ports in each antenna sub-array is generally the same.
It should be noted that GN + GPI may be fed back to the sending end device by the terminal at the same time, or may be carried on different uplink signaling and fed back to the sending end device at different times. If the receiving end device only feeds back the GPI to the sending end device, the sending end device may determine the grouping condition of the antenna port according to the GN received last time and the GPI fed back by the receiving end device this time, so as to determine the amount of subchannel information that the receiving end device should report, that is, the amount of PMI + RI that the receiving end device needs to report. GN + GPI may correspond not only to all antenna ports but also to a part of the antenna ports. That is, the grouping process of the antenna ports is only implemented on the used antenna ports, and the grouping is not performed on the unused antenna ports.
102. The transmitting end device divides the antenna array into a plurality of antenna sub-arrays according to the antenna grouping pattern.
It should be noted that one antenna port corresponds to at least one physical antenna. When an antenna port corresponds to a physical antenna, the antenna port is directly connected with an antenna array, and when the antenna port corresponds to at least two physical antennas, the antenna port is indirectly connected with the at least two antenna arrays through a TXRU (Tranceiver Unit), wherein the physical antennas correspond to the antenna arrays one to one.
For example: as shown in fig. 5, when GN is 4, the antenna array composed of the antenna ports may be divided into 4 antenna sub-arrays, respectively, antenna sub-array 1, antenna sub-array 2, antenna sub-array 3, and antenna sub-array 4. CSI-RS (channel state Information-Reference Signal) port, i.e., antenna port. The antenna subarray 1 corresponds to a CSI-RS port 0, a CSI-RS port 1, a CSI-RS port 8 and a CSI-RS port 9, the antenna subarray 2 corresponds to a CSI-RS port 2, a CSI-RS port 3, a CSI-RS port 10 and a CSI-RS port 11, the antenna subarray 3 corresponds to a CSI-RS port 4, a CSI-RS port 5, a CSI-RS port 12 and a CSI-RS port 13, and the antenna subarray 4 corresponds to a CSI-RS port 6, a CSI-RS port 7, a CSI-RS port 14 and a CSI-RS port 15. It should be noted that although the TXRU has an independent mapping relationship with the antenna element column and the TXRU and the CSI-RS port, each TXRU corresponds to a different antenna element, that is, each antenna sub-array also corresponds to a different antenna element.
Fig. 6 is a diagram showing the performance of the antenna port in both the grouped and ungrouped states. The horizontal axis represents SNR (Signal Noise Ratio) and the vertical axis represents SER (Symbol Error Rate). Since the complexity of SVD (Singular Value Decomposition) is O when the number of antenna ports constituting the antenna array is O3That is, when O reaches the order of tens, the complexity of SVD can reach 90% or even higher of the overall computational complexity. Such as: when O is 64, the calculation is carried out by adopting the method in the prior art, so that the calculation complexity of the terminal is 643After the method provided by the embodiment of the present invention is adopted, that is, the antenna ports constituting the antenna array are divided into 4 antenna sub-arrays, each antenna sub-array includes 16 antenna ports, and the terminal computation complexity is 4 × 163I.e., 1/16, the complexity of the computation performed by the prior art method, the complexity reduction of SVD is likely to reduce the complexity of the whole receiving device in the computation process by 5%.
In the channel estimation method provided by the embodiment of the present invention, the sending end device receives an antenna grouping indication sent by the receiving end device, and divides the antenna array into a plurality of antenna sub-arrays according to an antenna grouping pattern. The antenna grouping indication is used for indicating the sending end equipment to divide an antenna array of the sending end equipment into a plurality of antenna sub-arrays according to an antenna grouping pattern. Compared with the prior art that the sending end equipment determines the CSI by acquiring the PMIs and the RIs corresponding to the precodes which are generated by the receiving end equipment and used for representing all the antenna ports, the method can divide the antenna ports into a plurality of antenna sub-arrays by grouping the antenna ports which form the antenna array, so that the receiving end equipment generates the precodes for each antenna sub-array, feeds back the PMIs and the RIs corresponding to the precodes of each antenna sub-array to the sending end equipment, and then determines the CSI corresponding to each antenna sub-array after the sending end equipment receives the PMIs and the RIs corresponding to each antenna sub-array, thereby obtaining the CSI corresponding to all the antenna sub-arrays. In addition, in the process of precoding generation, the antenna ports forming the antenna array are divided into antenna sub-arrays. Along with the great increase of the number of the antennas, the complexity of the characteristic value decomposition is approximate to the sum of 3 power of the number of the antenna ports of each antenna subarray and is far less than the 3 power of the number of all the antenna ports, so that the problem of high difficulty in realizing spatial multiplexing caused by high complexity of the characteristic value decomposition process is solved, and meanwhile, a notification mode applied to antenna array grouping is provided, so that the grouping information of the antenna array is more flexible in the reporting process.
In order to ensure that the sending end device can successfully acquire the sub-channel information of each antenna sub-array, in an implementation manner of the embodiment of the present invention, the sending end device may trigger the receiving end device to feed back information including the sub-channel information of each antenna sub-array to the sending end device by sending a channel estimation indication to the receiving end device. Therefore, as shown in fig. 7, the method further includes steps 103 to 105:
103. the sending end equipment sends a channel estimation indication to the receiving end equipment.
104. And the sending end equipment receives the channel information fed back by the receiving end equipment based on the channel estimation indication.
The channel information includes subchannel information of each antenna sub-array in the multiple antenna sub-arrays, and the subchannel information may specifically be PMI and RI.
In the embodiment of the present invention, the sending end device may respectively determine CSI corresponding to each antenna sub-array according to PMIs and RIs corresponding to all antenna sub-arrays, so that the sending end device can implement spatial multiplexing according to CSI corresponding to all antenna sub-arrays.
It should be noted that, because the PMI and the RI can play a certain role after the GN and the GPI are determined, the PMI and the RI may be fed back to the transmitting end by using the same uplink signaling as the GN and the GPI, that is, the uplink signaling not only carries the antenna grouping pattern but also carries the channel estimation indication, or, after the GN and the GPI are fed back to the transmitting end by the terminal first, the PMI and the RI corresponding to all the antenna sub-arrays are fed back to the transmitting end by the terminal, that is, one uplink signaling carries the antenna grouping pattern, and the other uplink signaling carries the channel estimation indication, and the two uplink signaling are respectively sent to the transmitting end device, so that the transmitting end device obtains the antenna grouping pattern and the channel estimation indication.
105. And the sending end equipment calculates the channel information corresponding to the antenna array based on the channel information fed back by the receiving end equipment.
The application date is 2015, 5, month and 29, the international application number is PCT/CN2015/079290, and the invention name is "method and device for feeding back channel information of antenna array" provides a technical scheme for reducing the computational complexity of transmitting-end equipment by grouping antenna arrays. The specific method for calculating the channel information corresponding to the antenna array by the sending end device based on the channel information fed back by the receiving end device is provided.
The channel information of the nxm subchannels between the antenna array of the first network device and the antenna array of the second network device includes RI and PMI, or is precoding. The second network device may acquire channel information of the N × M subchannels in response to a Reference Signal (RS) from the first network device, or may acquire channel information of the N × M subchannels based on channel reciprocity. It should be noted that, in the embodiment of the present invention, the first network device may specifically be a sending end device, and the second network device may specifically be a receiving end device.
In the embodiment of the present invention, assuming that K is N × M, the channel information of K subchannels is obtained according to the following steps:
an autocorrelation matrix of a channel matrix of K subchannels is obtained. Specifically, the channel between the first network device and the second network device may be grouped according to predetermined subarray configuration information to obtain K subchannels:
H＝(H1,H2,…,Hk,…HK)
wherein HkDimension of
Figure BDA0000904524070000091
MkThe number of antenna ports of the k-th antenna group.
Obtaining RI of K sub-channels according to autocorrelation matrix of channel matrix of K sub-channelskAnd PMIk. Wherein, the step of obtaining RI and PMI of K sub-channels comprises:
the second network equipment acquires the autocorrelation matrix of the K sub-channels according to the K sub-channels;
performing Eigenvalue decomposition (EVD) or singular value decomposition on the autocorrelation matrix corresponding to the K subchannels to obtain corresponding precoding Uk。
The second network device may pre-code the K sub-channels with the corresponding UkAnd feeding back to the first network equipment. Or further, to UkQuantizing the corresponding codebook to respectively obtain RI of K sub-channelskAnd PMIkAnd feeds back to the first network device. Specifically, the dimension of each codeword in the precoding codebook used by the first network device and the second network device is Mk× r, wherein MkIs the number of antenna ports of the kth antenna group, and r is the number of streams.
It can be seen that the complexity of the SVD or EVD is higher when the number of antennas of the first network device is larger. By grouping the antenna arrays between the first network device and the second network device, the complexity of SVD or EVD is greatly reduced.
And then, the first network device generates channel information of a channel between the antenna array of the first network device and the antenna array of the second network device according to the channel information of the N multiplied by M sub-channels between the antenna array of the first network device and the antenna array of the second network device from the second network device.
When the channel information of the N × M sub-channels received by the first network equipment is pre-coded UkThen, the first network equipment precodes U according to K subchannelskObtaining a precoding U of a channel between an antenna array of a first network device and an antenna array of a second network device, specifically according to the following expression:
Figure BDA0000904524070000101
the first network equipment quantizes the precoding U to obtain RI and PMI of a channel between the antenna array of the first network equipment and the antenna array of the second network equipment, and when the channel information of the N × M sub-channels received by the first network equipment is the rank index RIkPMI with precoding indicationkRank indicator RI for K sub-channelskPMI with precoding indicationkCombining is performed, or the RI and PMI of the channel between the antenna array of the first network device and the antenna array of the second network device are obtained through a capacity maximization algorithm or other algorithms.
In the channel estimation method provided by the embodiment of the present invention, the sending end device sends a channel estimation indication to the receiving end device, receives channel information fed back by the receiving end device based on the channel estimation indication, and then calculates channel information corresponding to the antenna array based on the channel information fed back by the receiving end device. Wherein the channel information fed back based on the channel estimation indication comprises sub-channel information of each antenna sub-array of the plurality of antenna sub-arrays. Compared with the prior art that the sending end equipment determines the CSI by acquiring the PMIs and the RIs corresponding to the precodes which are generated by the receiving end equipment and used for representing all the antenna ports, the method can divide the antenna ports into a plurality of antenna sub-arrays by grouping the antenna ports which form the antenna array, so that the receiving end equipment generates the precodes for each antenna sub-array, feeds back the PMIs and the RIs corresponding to the precodes of each antenna sub-array to the sending end equipment, and then determines the CSI corresponding to each antenna sub-array after the sending end equipment receives the PMIs and the RIs corresponding to each antenna sub-array, thereby obtaining the CSI corresponding to all the antenna sub-arrays. In addition, in the process of precoding generation, the antenna ports forming the antenna array are divided into antenna sub-arrays. Along with the great increase of the number of the antennas, the complexity of the characteristic value decomposition is approximate to the sum of 3 power of the number of the antenna ports of each antenna subarray and is far less than the 3 power of the number of all the antenna ports, so that the problem of high difficulty in realizing spatial multiplexing caused by high complexity of the characteristic value decomposition process is solved, and meanwhile, a notification mode applied to antenna array grouping is provided, so that the grouping information of the antenna array is more flexible in the reporting process. It should be noted that the sending end device may trigger the receiving end device to feed back information including sub-channel information of each antenna sub-array to the sending end device by sending a channel estimation indication to the receiving end device, so that the sending end device calculates channel information corresponding to the antenna array based on the channel information fed back by the receiving end device.
In an implementation manner of the embodiment of the present invention, the sending end device may trigger the receiving end device to feed back the antenna grouping indication to the sending end device by sending the antenna grouping command to the receiving end device. On the basis of the implementation shown in fig. 1, the implementation shown in fig. 8 can also be realized. Before the sending end device receives the antenna grouping indication sent by the receiving end device in step 101, step 106 may also be executed:
106. the transmitting end device transmits an antenna grouping command to the receiving end device.
Wherein the antenna grouping command is used for instructing the receiving end device to transmit the antenna grouping indication.
In order to reduce the number of times that the sending end device sends the downlink signaling, that is, to avoid that the sending end device needs to send the downlink signaling to the terminal when needing to acquire GN and GPI of the antenna port each time, the antenna grouping command may further carry a first feedback period and a second feedback period, so that the receiving end device feeds back the antenna grouping command to the sending end device according to the feedback period and self-believes the information. The first feedback period is a feedback period of GN, the second feedback period is a feedback period of GPI, and the first feedback period and the second feedback period can be the same or different. It should be noted that the first feedback period and the second feedback period may be preset fixed and unchangeable parameters, or may be variable parameters set according to the requirement of the sending-end device to acquire GN and GPI.
As shown in fig. 9, a signaling interaction flow that needs to be performed between the sending end device and the receiving end device is performed when the sending end device needs to obtain GN and GPI from the receiving end device each time. That is, when the sending end device needs to acquire GN and GPI for the first time and needs to acquire GN and GPI for the second time, the sending end device needs to send an antenna grouping command to the receiving end device, where the antenna grouping command triggers the receiving end device to feed back GN and GPI to the sending end device. It should be noted that, at this time, the antenna grouping command sent by the sending end device does not carry the first feedback period and the second feedback period.
In the embodiment of the present invention, if the antenna grouping command sent by the sending end device does not carry the first feedback period and the second feedback period, when the first feedback period is different from the second feedback period, and the sending end device receives the GPI fed back by the receiving end device, the grouping condition of the current antenna array may be determined according to the GN fed back by the receiving end device last time and the GPI fed back by the receiving end device this time. When the first feedback period is the same as the second feedback period, the receiving end device may simultaneously feed back GN and GPI to the sending end device according to the feedback period by using the same uplink signaling carrying the antenna grouping indication, as shown in fig. 10. Or, the receiving end device may respectively feed back GN and GPI to the sending end device at the same time by using different uplink signaling that respectively carries part of the antenna grouping indication.
It should be noted that the type of the downlink signaling carrying the antenna grouping command and sent by the sending end device to the receiving end device is not limited to at least one of the UE specific signaling, the UE group specific signaling, and the cellspeicic signaling, and may also be other antenna grouping commands carrying GNs and GPIs that trigger the receiving end device to send to the sending end device.
In the channel estimation method provided by the embodiment of the present invention, the sending end device sends an antenna grouping command to the receiving end device, and then the sending end device receives an antenna grouping instruction sent by the receiving end device, and divides the antenna array into a plurality of antenna sub-arrays according to an antenna grouping pattern. The antenna grouping indication is used for indicating the sending end equipment to divide an antenna array of the sending end equipment into a plurality of antenna sub-arrays according to an antenna grouping pattern. Compared with the prior art that the sending end equipment determines the CSI by acquiring the PMIs and the RIs corresponding to the precodes which are generated by the receiving end equipment and used for representing all the antenna ports, the method can divide the antenna ports into a plurality of antenna sub-arrays by grouping the antenna ports which form the antenna array, so that the receiving end equipment generates the precodes for each antenna sub-array, feeds back the PMIs and the RIs corresponding to the precodes of each antenna sub-array to the sending end equipment, and then determines the CSI corresponding to each antenna sub-array after the sending end equipment receives the PMIs and the RIs corresponding to each antenna sub-array, thereby obtaining the CSI corresponding to all the antenna sub-arrays. In addition, in the process of precoding generation, the antenna ports forming the antenna array are divided into antenna sub-arrays. Along with the great increase of the number of the antennas, the complexity of the characteristic value decomposition is approximate to the sum of 3 power of the number of the antenna ports of each antenna subarray and is far less than the 3 power of the number of all the antenna ports, so that the problem of high difficulty in realizing spatial multiplexing caused by high complexity of the characteristic value decomposition process is solved, and meanwhile, a notification mode applied to antenna array grouping is provided, so that the grouping information of the antenna array is more flexible in the reporting process. It should be noted that the sending end device may trigger the receiving end device to feed back the antenna grouping indication to the sending end device by sending the antenna grouping command to the receiving end device.
An embodiment of the present invention provides a channel estimation method, as shown in fig. 11, where the method is executed by a receiving end device, and the method includes:
201. the receiving end device determines an antenna grouping pattern.
Because the grouping number of the antenna ports not only affects the calculation complexity of the receiving end equipment in the precoding process, but also affects the performance of the data transmission process between the sending end equipment and the receiving end equipment, namely, affects the error rate in the communication process, the antenna grouping pattern can be determined according to the actual requirement in the current communication process. It should be noted that, the greater the number of packets divided into antenna ports constituting the antenna array, the higher the error rate in the communication process, but this may greatly reduce the complexity of calculation performed by the receiving end device. In the embodiment of the present invention, the determination manner of the antenna grouping pattern is not particularly limited.
202. The receiving end device sends an antenna grouping indication to the sending end device.
The antenna grouping indication is used for indicating the sending end equipment to divide an antenna array of the sending end equipment into a plurality of antenna sub-arrays according to an antenna grouping pattern.
In order to ensure that GN and GPI fed back to the sending end device by the receiving end device can meet the requirements of the sending end device, in an implementation manner of the embodiment of the present invention, the downlink signaling may carry not only an antenna grouping indication but also a feedback mode, where the feedback mode may include a bandwidth mode or a subband mode. The receiving end device may determine whether to use the bandwidth mode for feedback of GN and GPI or use the subband mode for feedback of GN and GPI according to a feedback mode carried in the downlink signaling. The feedback of GN and GPI is carried out by adopting a bandwidth mode, so that data content carried by uplink signaling can be effectively reduced, and resources consumed in the signaling interaction process are reduced; the feedback of GN and GPI is carried out by adopting the sub-band mode, the precision of GN and GPI can be improved, and GN and GPI can be more accurately fed back to the transmitting terminal.
In the embodiment of the present invention, the sending end device may determine, according to the requirement of the CSI to be currently determined, that the receiving end device feeds back the uplink signaling to the sending end according to the bandwidth mode or the subband mode. That is, the downlink signaling sent from the sending end device to the receiving end device carries information for indicating the feedback mode, as shown in table one, the information is different meanings indicated by different bits for a field indicating the feedback mode in the downlink signaling.
Watch 1
Bits 00 01 10
Means of N/A Feedback mode 1 Feedback mode 2
When the field is 00, the meaning is N/a (Not Applicable); when the field is 01, the meaning indicated is Feedback mode 1 (Feedback mode 1); when the field is 01, the meaning indicated is Feedback mode 2 (Feedback mode 2). In the embodiment of the present invention, the feedback mode 1 may specifically be a bandwidth mode, and the feedback mode 2 may specifically be a subband mode, as shown in table two.
Watch two
Figure BDA0000904524070000141
Note that, the contents shown in table two are types corresponding to the feedback modes and information that needs to be fed back when the feedback modes are feedback mode 1 and feedback mode 2. In the embodiment of the present invention, the receiving end device may also perform feedback on GN and GPI by using the same feedback mode and different uplink signaling methods.
In the channel estimation method provided by the embodiment of the present invention, the receiving end device determines an antenna grouping pattern and sends an antenna grouping indication to the sending end device, so that the sending end device receives the antenna grouping indication sent by the receiving end device, and divides the antenna array into a plurality of antenna sub-arrays according to the antenna grouping pattern. The antenna grouping indication is used for indicating the sending end equipment to divide an antenna array of the sending end equipment into a plurality of antenna sub-arrays according to an antenna grouping pattern. Compared with the prior art that the sending end equipment determines the CSI by acquiring the PMIs and the RIs corresponding to the precodes which are generated by the receiving end equipment and used for representing all the antenna ports, the method can divide the antenna ports into a plurality of antenna sub-arrays by grouping the antenna ports which form the antenna array, so that the receiving end equipment generates the precodes for each antenna sub-array, feeds back the PMIs and the RIs corresponding to the precodes of each antenna sub-array to the sending end equipment, and then determines the CSI corresponding to each antenna sub-array after the sending end equipment receives the PMIs and the RIs corresponding to each antenna sub-array, thereby obtaining the CSI corresponding to all the antenna sub-arrays. In addition, in the process of precoding generation, the antenna ports forming the antenna array are divided into antenna sub-arrays. Along with the great increase of the number of the antennas, the complexity of the characteristic value decomposition is approximate to the sum of 3 power of the number of the antenna ports of each antenna subarray and is far less than the 3 power of the number of all the antenna ports, so that the problem of high difficulty in realizing spatial multiplexing caused by high complexity of the characteristic value decomposition process is solved, and meanwhile, a notification mode applied to antenna array grouping is provided, so that the grouping information of the antenna array is more flexible in the reporting process.
In order to ensure that the sending end device can successfully acquire the sub-channel information of each antenna sub-array, in an implementation manner of the embodiment of the present invention, the receiving end device may feed back information including the sub-channel information of each antenna sub-array to the sending end device by receiving a channel estimation indication sent by the sending end device. Therefore, as shown in fig. 12, the method may further include steps 203 and 204:
203. and the receiving end equipment receives the channel estimation indication sent by the sending end equipment.
204. The receiving end equipment feeds back the channel information based on the channel estimation indication, so that the sending end equipment calculates the channel information corresponding to the antenna array based on the channel information fed back by the receiving end equipment.
Wherein the channel information comprises sub-channel information for each of the plurality of antenna sub-arrays.
In the channel estimation method provided by the embodiment of the present invention, the receiving end device receives the channel estimation indication sent by the sending end device, and feeds back the channel information based on the channel estimation indication, so that the sending end device calculates the channel information corresponding to the antenna array based on the channel information fed back by the receiving end device. Wherein the channel information comprises sub-channel information for each of the plurality of antenna sub-arrays. Compared with the prior art that the sending end equipment determines the CSI by acquiring the PMIs and the RIs corresponding to the precodes which are generated by the receiving end equipment and used for representing all the antenna ports, the method can divide the antenna ports into a plurality of antenna sub-arrays by grouping the antenna ports which form the antenna array, so that the receiving end equipment generates the precodes for each antenna sub-array, feeds back the PMIs and the RIs corresponding to the precodes of each antenna sub-array to the sending end equipment, and then determines the CSI corresponding to each antenna sub-array after the sending end equipment receives the PMIs and the RIs corresponding to each antenna sub-array, thereby obtaining the CSI corresponding to all the antenna sub-arrays. In addition, in the process of precoding generation, the antenna ports forming the antenna array are divided into antenna sub-arrays. Along with the great increase of the number of the antennas, the complexity of the eigenvalue decomposition is approximate to the sum of the powers of 3 of the number of the antenna ports of each antenna subarray and is far less than the powers of 3 of the number of all the antenna ports, so that the problem of high difficulty in realizing the spatial multiplexing caused by high complexity of the eigenvalue decomposition process is solved. It should be noted that the receiving end device may feed back information including sub-channel information of each antenna sub-array to the sending end device by receiving a channel estimation indication sent by the sending end device, so that the sending end device calculates channel information corresponding to the antenna array based on the channel information fed back by the receiving end device.
In order to ensure that the receiving end device can accurately send the antenna grouping pattern to the sending end device, in an implementation manner of the embodiment of the present invention, the receiving end device may determine the antenna grouping pattern that needs to be sent to the sending end device according to an antenna grouping command sent by the sending end device. Therefore, on the basis of the implementation shown in fig. 11, the implementation shown in fig. 13 may also be implemented, before the receiving end device determines the antenna grouping pattern in step 201, step 205 may also be performed, and step 201 may specifically be performed as step 2011:
205. the receiving end equipment receives the antenna grouping command sent by the sending end equipment.
2011. The receiving end device determines an antenna grouping pattern based on the antenna grouping command.
In this embodiment of the present invention, the antenna array of the sending end device may include M sub-arrays, the antenna array of the receiving end device may include N sub-arrays, a channel between the antenna array of the sending end device and the antenna array of the receiving end device includes N × M sub-channels, M and N are positive integers and are not 1 at the same time, and the M sub-arrays and the N sub-arrays include at least two antennas.
The sending end equipment receives the channel information of the NxM sub-channels sent by the receiving end equipment, and generates the channel information of the channel between the antenna array of the sending end equipment and the antenna array of the receiving end equipment according to the channel information of the NxM sub-channels from the receiving end equipment.
It should be noted that the channel information of the nxm sub-channels may include RI and PMI, each sub-channel in the nxm sub-channels corresponds to one sub-channel matrix, and the channel information of the nxm sub-channels is obtained as follows: and obtaining an autocorrelation matrix of a subchannel matrix corresponding to the N multiplied by M subchannels, and then obtaining the RI and PMI of the N multiplied by M subchannels according to the autocorrelation matrix of the channel matrix of the N multiplied by M subchannels.
In addition, the channel information of the nxm subchannels may further include precoding, each subchannel in the nxm subchannels corresponds to one subchannel matrix, and the channel information of the nxm subchannels is obtained in the following manner: and acquiring an autocorrelation matrix of a subchannel matrix corresponding to the N multiplied by M subchannels, and then acquiring precoding of the N multiplied by M subchannels according to the autocorrelation matrix of the channel matrix of the N multiplied by M subchannels.
In this embodiment of the present invention, the sending end device may further send subarray configuration information to the receiving end device, where the subarray configuration information is used to divide an antenna array of the sending end device into M subarrays, where M is a positive integer greater than or equal to 2.
It should be noted that the subarray configuration information includes at least one pattern, and M subarrays are determined according to the at least one pattern; the subarray configuration information may include a starting port number of each subarray, and each subarray of the M subarrays is determined according to the starting port number; the subarray configuration information may be sent through a physical downlink common control channel PDCCH, radio link layer control protocol RLC signaling, or a physical broadcast channel PBCH.
In the channel estimation method provided by the embodiment of the present invention, the receiving end device receives an antenna grouping command sent by the sending end device, determines an antenna grouping pattern based on the antenna grouping command, and then sends an antenna grouping indication to the sending end device, so that the sending end device receives the antenna grouping indication sent by the receiving end device, and divides the antenna array into a plurality of antenna sub-arrays according to the antenna grouping pattern. The antenna grouping indication is used for indicating the sending end equipment to divide an antenna array of the sending end equipment into a plurality of antenna sub-arrays according to an antenna grouping pattern. Compared with the prior art that the sending end equipment determines the CSI by acquiring the PMIs and the RIs corresponding to the precodes which are generated by the receiving end equipment and used for representing all the antenna ports, the method can divide the antenna ports into a plurality of antenna sub-arrays by grouping the antenna ports which form the antenna array, so that the receiving end equipment generates the precodes for each antenna sub-array, feeds back the PMIs and the RIs corresponding to the precodes of each antenna sub-array to the sending end equipment, and then determines the CSI corresponding to each antenna sub-array after the sending end equipment receives the PMIs and the RIs corresponding to each antenna sub-array, thereby obtaining the CSI corresponding to all the antenna sub-arrays. In addition, in the process of precoding generation, the antenna ports forming the antenna array are divided into antenna sub-arrays. Along with the great increase of the number of the antennas, the complexity of the characteristic value decomposition is approximate to the sum of 3 power of the number of the antenna ports of each antenna subarray and is far less than the 3 power of the number of all the antenna ports, so that the problem of high difficulty in realizing spatial multiplexing caused by high complexity of the characteristic value decomposition process is solved, and meanwhile, a notification mode applied to antenna array grouping is provided, so that the grouping information of the antenna array is more flexible in the reporting process. It should be noted that the receiving end device may determine the antenna grouping pattern that needs to be sent to the sending end device according to the antenna grouping command sent by the sending end device.
An embodiment of the present invention provides a channel estimation apparatus 30, as shown in fig. 14, where the apparatus 30 is configured to execute the method flows shown in fig. 1, fig. 7, or fig. 8, and the apparatus 30 includes:
the receiving module 31 is configured to receive an antenna grouping instruction sent by the receiving end device, where the antenna grouping instruction is used to instruct the sending end device to divide an antenna array of the sending end device into a plurality of antenna sub-arrays according to an antenna grouping pattern.
A processing module 32 for dividing the antenna array into a plurality of antenna sub-arrays according to an antenna grouping pattern.
In one implementation manner of the embodiment of the present invention, the apparatus 30 further includes:
a sending module 33, configured to send a channel estimation indication to the receiving end device.
The receiving module 31 is further configured to receive channel information fed back by the receiving end device based on the channel estimation indication, where the channel information includes sub-channel information of each antenna sub-array in the multiple antenna sub-arrays.
The processing module 32 is further configured to calculate channel information corresponding to the antenna array based on the channel information fed back by the receiving end device.
In an implementation manner of the embodiment of the present invention, the sending module 33 is further configured to send an antenna grouping command to the receiving end device by the sending end device, where the antenna grouping command is used to instruct the receiving end device to send an antenna grouping instruction.
In the channel estimation apparatus provided in the embodiment of the present invention, the sending end device receives an antenna grouping indication sent by the receiving end device, and divides the antenna array into a plurality of antenna sub-arrays according to an antenna grouping pattern. The antenna grouping indication is used for indicating the sending end equipment to divide an antenna array of the sending end equipment into a plurality of antenna sub-arrays according to an antenna grouping pattern. Compared with the prior art that the sending end equipment determines the CSI by acquiring the PMIs and the RIs corresponding to the precodes which are generated by the receiving end equipment and used for representing all the antenna ports, the method can divide the antenna ports into a plurality of antenna sub-arrays by grouping the antenna ports which form the antenna array, so that the receiving end equipment generates the precodes for each antenna sub-array, feeds back the PMIs and the RIs corresponding to the precodes of each antenna sub-array to the sending end equipment, and then determines the CSI corresponding to each antenna sub-array after the sending end equipment receives the PMIs and the RIs corresponding to each antenna sub-array, thereby obtaining the CSI corresponding to all the antenna sub-arrays. In addition, in the process of precoding generation, the antenna ports forming the antenna array are divided into antenna sub-arrays. Along with the great increase of the number of the antennas, the complexity of the characteristic value decomposition is approximate to the sum of 3 power of the number of the antenna ports of each antenna subarray and is far less than the 3 power of the number of all the antenna ports, so that the problem of high difficulty in realizing spatial multiplexing caused by high complexity of the characteristic value decomposition process is solved, and meanwhile, a notification mode applied to antenna array grouping is provided, so that the grouping information of the antenna array is more flexible in the reporting process.
An embodiment of the present invention provides a channel estimation apparatus 40, as shown in fig. 15, where the apparatus 40 is configured to execute the method flow shown in any one of fig. 11 to 13, and the apparatus 40 includes:
a processing module 41 for determining an antenna grouping pattern.
A sending module 42, configured to send an antenna grouping instruction to the sending end device, where the antenna grouping instruction is used to instruct the sending end device to divide an antenna array of the sending end device into multiple antenna sub-arrays according to an antenna grouping pattern.
In one implementation manner of the embodiment of the present invention, the apparatus 40 further includes:
a receiving module 43, configured to receive the channel estimation indication sent by the sending end device.
The sending module 42 is further configured to feed back channel information based on the channel estimation indication, so that the sending end device calculates channel information corresponding to the antenna array based on the channel information fed back by the receiving end device, where the fed back channel information includes sub-channel information of each antenna sub-array in the multiple antenna sub-arrays.
In an implementation manner of the embodiment of the present invention, the receiving module 43 is further configured to receive an antenna grouping command sent by the sending end device.
The processing module 41 is specifically configured to determine an antenna grouping pattern based on the antenna grouping command.
In the channel estimation apparatus provided in the embodiment of the present invention, the receiving end device determines an antenna grouping pattern and sends an antenna grouping indication to the sending end device, so that the sending end device receives the antenna grouping indication sent by the receiving end device, and divides the antenna array into a plurality of antenna sub-arrays according to the antenna grouping pattern. The antenna grouping indication is used for indicating the sending end equipment to divide an antenna array of the sending end equipment into a plurality of antenna sub-arrays according to an antenna grouping pattern. Compared with the prior art that the sending end equipment determines the CSI by acquiring the PMIs and the RIs corresponding to the precodes which are generated by the receiving end equipment and used for representing all the antenna ports, the method can divide the antenna ports into a plurality of antenna sub-arrays by grouping the antenna ports which form the antenna array, so that the receiving end equipment generates the precodes for each antenna sub-array, feeds back the PMIs and the RIs corresponding to the precodes of each antenna sub-array to the sending end equipment, and then determines the CSI corresponding to each antenna sub-array after the sending end equipment receives the PMIs and the RIs corresponding to each antenna sub-array, thereby obtaining the CSI corresponding to all the antenna sub-arrays. In addition, in the process of precoding generation, the antenna ports forming the antenna array are divided into antenna sub-arrays. Along with the great increase of the number of the antennas, the complexity of the characteristic value decomposition is approximate to the sum of 3 power of the number of the antenna ports of each antenna subarray and is far less than the 3 power of the number of all the antenna ports, so that the problem of high difficulty in realizing spatial multiplexing caused by high complexity of the characteristic value decomposition process is solved, and meanwhile, a notification mode applied to antenna array grouping is provided, so that the grouping information of the antenna array is more flexible in the reporting process.
An embodiment of the present invention provides a sending-end device 50, as shown in fig. 16, where the sending-end device 50 is configured to execute a method flow shown in fig. 1, fig. 7, or fig. 8. The sender device 50 comprises a processor 51 and an interface circuit 52, and further comprises a memory 53 and a bus 54, wherein the processor 51, the interface circuit 52 and the memory 53 are connected via the bus 54 and perform communication with each other.
It should be noted that the processor 51 may be a single processing element or may be a general term for multiple processing elements. For example, the Processing element may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention, such as: one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs).
The memory 53 may be a storage device or a combination of storage elements, and is used for storing executable program codes or parameters, data, etc. required by the operation of the access network management device. And the memory 53 may include a Random Access Memory (RAM) or a non-volatile memory (non-volatile memory), such as a magnetic disk memory, Flash memory (Flash), etc.
The bus 54 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus 54 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 16, but this is not intended to represent only one bus or type of bus.
The initiator device 50 may also include input/output devices coupled to the bus 54 for coupling to other components, such as the processor 51, via the bus 54.
Wherein the processor 51 calls the program code in the memory 53 for performing the operations performed by the sending end device 50 in the above method embodiments. For example, it includes:
the interface circuit 52 is configured to receive an antenna grouping indication sent by the receiving end device, where the antenna grouping indication is used to instruct the sending end device to divide an antenna array of the sending end device into a plurality of antenna sub-arrays according to an antenna grouping pattern.
A processor 51 for dividing the antenna array into a plurality of antenna sub-arrays according to an antenna grouping pattern.
In one implementation manner of the embodiment of the present invention, the interface circuit 52 is further configured to send a channel estimation indication to the receiving end device.
The interface circuit 52 is further configured to receive channel information fed back by the receiving-end device based on the channel estimation indication, where the channel information includes sub-channel information of each antenna sub-array in the multiple antenna sub-arrays.
The processor 51 is further configured to calculate channel information corresponding to the antenna array based on the channel information fed back by the receiving end device.
In one implementation manner of the embodiment of the present invention, before the interface circuit 52 receives the antenna grouping instruction sent by the receiving end device, the interface circuit 52 is further configured to send an antenna grouping command to the receiving end device, where the antenna grouping command is used to instruct the receiving end device to send the antenna grouping instruction.
In the transmitting end device provided in the embodiment of the present invention, the transmitting end device receives an antenna grouping indication sent by the receiving end device, and divides an antenna array into a plurality of antenna sub-arrays according to an antenna grouping pattern. The antenna grouping indication is used for indicating the sending end equipment to divide an antenna array of the sending end equipment into a plurality of antenna sub-arrays according to an antenna grouping pattern. Compared with the prior art that the sending end equipment determines the CSI by acquiring the PMIs and the RIs corresponding to the precodes which are generated by the receiving end equipment and used for representing all the antenna ports, the method can divide the antenna ports into a plurality of antenna sub-arrays by grouping the antenna ports which form the antenna array, so that the receiving end equipment generates the precodes for each antenna sub-array, feeds back the PMIs and the RIs corresponding to the precodes of each antenna sub-array to the sending end equipment, and then determines the CSI corresponding to each antenna sub-array after the sending end equipment receives the PMIs and the RIs corresponding to each antenna sub-array, thereby obtaining the CSI corresponding to all the antenna sub-arrays. In addition, in the process of precoding generation, the antenna ports forming the antenna array are divided into antenna sub-arrays. Along with the great increase of the number of the antennas, the complexity of the characteristic value decomposition is approximate to the sum of 3 power of the number of the antenna ports of each antenna subarray and is far less than the 3 power of the number of all the antenna ports, so that the problem of high difficulty in realizing spatial multiplexing caused by high complexity of the characteristic value decomposition process is solved, and meanwhile, a notification mode applied to antenna array grouping is provided, so that the grouping information of the antenna array is more flexible in the reporting process.
An embodiment of the present invention provides a sink device 60, as shown in fig. 17, where the sink device 60 is configured to execute the method flow shown in any one of fig. 11 to 13,
the sink device 60 comprises a processor 61 and an interface circuit 62, and a memory 63 and a bus 64 are shown, wherein the processor 61, the interface circuit 62 and the memory 63 are connected via the bus 64 and communicate with each other.
It should be noted that the processor 61 may be a single processing element or may be a general term for multiple processing elements. For example, the Processing element may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention, such as: one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs).
The memory 63 may be a storage device or a combination of storage elements, and is used for storing executable program codes or parameters, data, etc. required by the operation of the access network management device. And the memory 63 may include a Random Access Memory (RAM) or a non-volatile memory (non-volatile memory), such as a magnetic disk memory, Flash memory (Flash), etc.
The bus 64 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus 64 may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 17, but this does not mean only one bus or one type of bus.
The sink device 60 may further include an input/output device connected to the bus 64 to connect with the processor 61 and other parts via the bus 64.
Wherein the processor 61 calls the program code in the memory 63 for executing the operations performed by the receiving end device 60 in the above method embodiments. For example, it includes:
a processor 61 for determining an antenna grouping pattern.
The interface circuit 62 is configured to send an antenna grouping instruction to the sending end device, where the antenna grouping instruction is used to instruct the sending end device to divide an antenna array of the sending end device into a plurality of antenna sub-arrays according to an antenna grouping pattern.
In an implementation manner of the embodiment of the present invention, the interface circuit 62 is further configured to receive a channel estimation indication sent by the sending end device.
The processor 61 is further configured to feed back channel information based on the channel estimation indicator, so that the sending end device calculates channel information corresponding to the antenna array based on the channel information fed back by the receiving end device, where the fed back channel information includes sub-channel information of each antenna sub-array in the multiple antenna sub-arrays.
In one implementation manner of the embodiment of the present invention, before the receiving-end device determines the antenna grouping pattern, the interface circuit 62 is further configured to receive an antenna grouping command sent by the sending-end device.
The processor 61 is specifically configured to determine an antenna grouping pattern based on the antenna grouping command.
In the receiving end device provided in the embodiment of the present invention, the receiving end device determines an antenna grouping pattern and sends an antenna grouping indication to the sending end device, so that the sending end device receives the antenna grouping indication sent by the receiving end device, and divides an antenna array into a plurality of antenna sub-arrays according to the antenna grouping pattern. The antenna grouping indication is used for indicating the sending end equipment to divide an antenna array of the sending end equipment into a plurality of antenna sub-arrays according to an antenna grouping pattern. Compared with the prior art that the sending end equipment determines the CSI by acquiring the PMIs and the RIs corresponding to the precodes which are generated by the receiving end equipment and used for representing all the antenna ports, the method can divide the antenna ports into a plurality of antenna sub-arrays by grouping the antenna ports which form the antenna array, so that the receiving end equipment generates the precodes for each antenna sub-array, feeds back the PMIs and the RIs corresponding to the precodes of each antenna sub-array to the sending end equipment, and then determines the CSI corresponding to each antenna sub-array after the sending end equipment receives the PMIs and the RIs corresponding to each antenna sub-array, thereby obtaining the CSI corresponding to all the antenna sub-arrays. In addition, in the process of precoding generation, the antenna ports forming the antenna array are divided into antenna sub-arrays. Along with the great increase of the number of the antennas, the complexity of the characteristic value decomposition is approximate to the sum of 3 power of the number of the antenna ports of each antenna subarray and is far less than the 3 power of the number of all the antenna ports, so that the problem of high difficulty in realizing spatial multiplexing caused by high complexity of the characteristic value decomposition process is solved, and meanwhile, a notification mode applied to antenna array grouping is provided, so that the grouping information of the antenna array is more flexible in the reporting process.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (12)

1. A method of channel estimation, comprising:
the method comprises the steps that a sending end device receives an antenna grouping indication sent by a receiving end device, wherein the antenna grouping indication comprises an antenna grouping pattern, the antenna grouping indication is used for indicating the sending end device to divide an antenna array of the sending end device into a plurality of antenna sub-arrays according to the antenna grouping pattern, and the antenna grouping pattern comprises the grouping number of antenna ports and the grouping mode of the antenna ports;
the transmitting end equipment divides the antenna array into a plurality of antenna sub-arrays according to the antenna grouping pattern;
the sending end device calculates channel information corresponding to the antenna array based on the channel information fed back by the receiving end device, wherein the channel information comprises sub-channel information of each antenna sub-array in the plurality of antenna sub-arrays.
2. The method of claim 1, further comprising:
the sending end equipment sends a channel estimation instruction to the receiving end equipment;
and the sending end equipment receives the channel information fed back by the receiving end equipment based on the channel estimation indication.
3. The method according to claim 1 or 2, wherein before the sending end device receives the antenna packet indication sent by the receiving end device, the method further comprises:
and the sending end equipment sends an antenna grouping command to the receiving end equipment, wherein the antenna grouping command is used for indicating the receiving end equipment to send the antenna grouping indication.
4. A method of channel estimation, comprising:
the receiving end equipment determines an antenna grouping pattern, wherein the antenna grouping pattern comprises the grouping number of antenna ports and the grouping mode of the antenna ports;
the receiving end equipment sends an antenna grouping indication to sending end equipment, the antenna grouping indication comprises the antenna grouping pattern, and the antenna grouping indication is used for indicating the sending end equipment to divide an antenna array of the sending end equipment into a plurality of antenna sub-arrays according to the antenna grouping pattern;
the receiving end device feeds back channel information so that the sending end device can calculate channel information corresponding to the antenna array based on the channel information fed back by the receiving end device, wherein the channel information comprises sub-channel information of each antenna sub-array in the multiple antenna sub-arrays.
5. The method of claim 4, further comprising:
the receiving end equipment receives a channel estimation indication sent by the sending end equipment;
the receiving end device indicates feedback channel information based on the channel estimation.
6. The method according to claim 4 or 5, wherein before the receiving end device determines the antenna grouping pattern, the method further comprises:
the receiving end equipment receives an antenna grouping command sent by the sending end equipment;
the receiving end device determines the antenna grouping pattern, including:
the receiving end device determines the antenna grouping pattern based on the antenna grouping command.
7. A channel estimation device, comprising:
the receiving module is used for receiving an antenna grouping instruction sent by receiving end equipment, wherein the antenna grouping instruction comprises an antenna grouping pattern, the antenna grouping instruction is used for instructing the sending end equipment to divide an antenna array of the sending end equipment into a plurality of antenna sub-arrays according to the antenna grouping pattern, and the antenna grouping pattern comprises the grouping number of antenna ports and the grouping mode of the antenna ports;
a processing module for dividing the antenna array into the plurality of antenna sub-arrays according to the antenna grouping pattern;
the processing module is further configured to calculate channel information corresponding to the antenna array based on channel information fed back by the receiving end device, where the channel information includes sub-channel information of each antenna sub-array in the multiple antenna sub-arrays.
8. The apparatus of claim 7, further comprising:
a sending module, configured to send a channel estimation indication to the receiving end device;
the receiving module is further configured to receive channel information fed back by the receiving end device based on the channel estimation indication.
9. The apparatus according to claim 7 or 8, wherein the sending module is further configured to send, by the sending end device, an antenna grouping command to the receiving end device, where the antenna grouping command is used to instruct the receiving end device to send the antenna grouping indication.
10. A channel estimation device, comprising:
a processing module for determining an antenna grouping pattern, the antenna grouping pattern including a grouping number of antenna ports, a grouping mode of antenna ports;
a sending module, configured to send an antenna grouping indication to sending end equipment, where the antenna grouping indication includes the antenna grouping pattern, and the antenna grouping indication is used to indicate the sending end equipment to divide an antenna array of the sending end equipment into a plurality of antenna sub-arrays according to the antenna grouping pattern;
the sending module is further configured to feed back channel information, so that the sending end device calculates channel information corresponding to the antenna array based on the channel information fed back by the sending module, where the fed back channel information includes sub-channel information of each of the plurality of antenna sub-arrays.
11. The apparatus of claim 10, further comprising:
a receiving module, configured to receive a channel estimation indication sent by the sending end device;
the sending module is further configured to feed back channel information based on the channel estimation indication.
12. The apparatus according to claim 10 or 11, wherein the receiving module is further configured to receive an antenna grouping command sent by the sending end device;
the processing module is specifically configured to determine the antenna grouping pattern based on the antenna grouping command.
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Publication number Priority date Publication date Assignee Title
CN109842435A (en) 2017-11-24 2019-06-04 上海诺基亚贝尔股份有限公司 A kind of method and apparatus for executing precoding
CN112054831B (en) * 2019-06-06 2022-04-12 华为技术有限公司 Feedback method and device of channel state information
CN112751590B (en) * 2019-10-31 2023-03-31 中国移动通信有限公司研究院 Method and device for feeding back channel information

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101606339A (en) * 2006-01-13 2009-12-16 Lg电子株式会社 Use realizes the method and apparatus of transmit diversity and spatial reuse based on the sky line options of feedback information
CN101674122A (en) * 2008-09-11 2010-03-17 大唐移动通信设备有限公司 Method and device for acquiring uplink complete channel matrix in TDD system
CN102111204A (en) * 2009-12-29 2011-06-29 中兴通讯股份有限公司 Method and system for reporting terminal space angle of arrival
CN103199905A (en) * 2012-01-09 2013-07-10 光宝电子(广州)有限公司 Antenna array control method and communication device using same
CN103858359A (en) * 2013-12-27 2014-06-11 华为技术有限公司 Antenna array, signal mapping method and base station
WO2015008992A1 (en) * 2013-07-14 2015-01-22 엘지전자 주식회사 Method for transceiving data symbol using antenna correlation in wireless access system which supports massive antenna

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE338388T1 (en) * 2002-04-30 2006-09-15 Motorola Inc WIRELESS COMMUNICATION USING MULTIPLE TRANSMIT AND RECEIVE ANTENNA ARRANGEMENT
CN104662811B (en) * 2012-09-18 2018-05-01 Lg电子株式会社 The method and its equipment of effective Feedback are sent in multi-aerial radio communication system
US9178583B2 (en) * 2013-01-08 2015-11-03 Samsung Electronics Co., Ltd. Channel state information feedback design in advanced wireless communication systems
CN105471487B (en) * 2014-07-01 2020-07-24 索尼公司 Communication apparatus, base station, and communication method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101606339A (en) * 2006-01-13 2009-12-16 Lg电子株式会社 Use realizes the method and apparatus of transmit diversity and spatial reuse based on the sky line options of feedback information
CN101674122A (en) * 2008-09-11 2010-03-17 大唐移动通信设备有限公司 Method and device for acquiring uplink complete channel matrix in TDD system
CN102111204A (en) * 2009-12-29 2011-06-29 中兴通讯股份有限公司 Method and system for reporting terminal space angle of arrival
CN103199905A (en) * 2012-01-09 2013-07-10 光宝电子(广州)有限公司 Antenna array control method and communication device using same
WO2015008992A1 (en) * 2013-07-14 2015-01-22 엘지전자 주식회사 Method for transceiving data symbol using antenna correlation in wireless access system which supports massive antenna
CN103858359A (en) * 2013-12-27 2014-06-11 华为技术有限公司 Antenna array, signal mapping method and base station

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