WO2015165070A1 - 信道测量方法、信道测量装置、用户设备及*** - Google Patents
信道测量方法、信道测量装置、用户设备及*** Download PDFInfo
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- WO2015165070A1 WO2015165070A1 PCT/CN2014/076591 CN2014076591W WO2015165070A1 WO 2015165070 A1 WO2015165070 A1 WO 2015165070A1 CN 2014076591 W CN2014076591 W CN 2014076591W WO 2015165070 A1 WO2015165070 A1 WO 2015165070A1
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- 238000000691 measurement method Methods 0.000 title claims abstract description 16
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- 238000012549 training Methods 0.000 claims abstract description 169
- 238000012545 processing Methods 0.000 claims abstract description 58
- 238000004891 communication Methods 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 37
- 239000011159 matrix material Substances 0.000 claims description 117
- 239000013598 vector Substances 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 8
- 238000012804 iterative process Methods 0.000 description 5
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- 238000006243 chemical reaction Methods 0.000 description 3
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
-
- 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
- H04B7/0417—Feedback systems
- H04B7/0421—Feedback systems utilizing implicit feedback, e.g. steered pilot signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- Channel measurement method Channel measurement device, user equipment and system
- the present invention relates to communication technologies, and in particular, to a channel measurement method, a channel measurement device, a user equipment, and a system. Background technique
- BS base station
- UE User Equipment
- the method of obtaining the Channel State Information at the Transmitter (CSIT) at the BS end is: First, the BS side Sending a training sequence of length T to the UE, the UE receives the channel response sequence after the training sequence passes through the channel, and recovers the channel state information from the channel response sequence by using Least Square (LS). State Information (CSI), and then the recovered CSI is fed back to the BS through the uplink feedback link.
- LS Least Square
- the present invention provides a channel measurement method, a channel measurement apparatus, a user equipment, and a system, which are used to solve the problem that the UE has a large feedback overhead when performing CSIT estimation in the prior art.
- a first aspect of the present invention provides a channel measurement method, the wireless communication system including a channel measurement apparatus and at least two user equipments, the method comprising:
- the channel measurement device sends an antenna domain training sequence to the at least two user equipments; the channel measurement device receives a channel response measurement sequence sent by the at least two user equipments, where the channel response measurement sequence is the antenna domain After the training sequence passes through the channel, it is said to a sequence received by two less user devices;
- the channel measurement apparatus performs joint processing on the received channel response measurement sequence of the at least two user equipments to obtain downlink channel state information CSIT.
- a channel measurement method is provided.
- the wireless communication system includes a channel measurement device and at least two user equipments, and the method includes:
- the user equipment Receiving, by the user equipment, an antenna domain training sequence sent by the channel measurement apparatus; the user equipment transmitting a channel response measurement sequence to the channel measurement apparatus, so that the channel measurement apparatus has a channel response to the received at least two user equipments
- the measurement sequence is jointly processed to obtain downlink channel state information CSIT, and the channel response measurement sequence is a sequence received by the user equipment after the antenna domain training sequence passes through the channel.
- a channel measurement apparatus comprising:
- a transmitting module configured to send an antenna domain training sequence to the at least two user equipments
- a receiving module configured to receive a channel response measurement sequence sent by the at least two user equipments, where the channel response measurement sequence is the antenna domain a sequence received by the at least two user equipments after the training sequence passes through the channel;
- a processing module configured to perform joint processing on the received channel response measurement sequence of the at least two user equipments to obtain downlink channel state information CSIT.
- a fourth aspect of the present invention provides a user equipment, where the wireless communication system includes a channel measurement apparatus and at least two of the user equipments, and the user equipment includes:
- a receiving module configured to receive an antenna domain training sequence sent by the channel measurement device
- a sending module configured to send a channel response measurement sequence to the channel measurement device, to enable the channel measurement device to receive at least two user equipments
- the channel response measurement sequence is jointly processed to obtain downlink channel state information CSIT, and the channel response measurement sequence is a sequence received by the user equipment after the antenna domain training sequence passes through the channel.
- a channel measurement apparatus is provided.
- the wireless communication system includes a channel measurement apparatus and at least two user equipments, and the channel measurement apparatus includes:
- a transmitter configured to send an antenna domain training sequence to the at least two user equipments
- a receiver configured to receive a channel response measurement sequence sent by the at least two user equipments, where the channel response measurement sequence is the antenna domain
- the training sequence is passed through the channel by the at least two The sequence received by the user equipment
- a processor configured to perform joint processing on the received channel response measurement sequence of the at least two user equipments to obtain downlink channel state information CSIT.
- a sixth aspect of the present invention provides a user equipment, where the wireless communication system includes a channel measurement apparatus and at least two of the user equipments, and the user equipment includes:
- a receiver configured to receive an antenna domain training sequence sent by the channel measurement device
- a transmitter configured to send a channel response measurement sequence to the channel measurement device, to enable the channel measurement device to receive at least two user equipments
- the channel response measurement sequence is jointly processed to obtain downlink channel state information CSIT, and the channel response measurement sequence is a sequence received by the user equipment after the antenna domain training sequence passes through the channel.
- a seventh aspect of the invention provides a system comprising the channel measuring device of the third aspect and the at least two user devices of the fourth aspect.
- a system comprising the channel measuring apparatus of the fifth aspect and at least two user equipments of the sixth aspect is provided.
- the wireless communication system includes a channel measurement device and at least two user equipments, the method comprising: the channel measurement device transmitting an antenna domain training sequence to at least two user equipments; the channel measurement device receiving at least two user equipments The transmitted channel response measurement sequence, the channel response measurement sequence is a sequence that is received by the at least two user equipments after the antenna domain training sequence passes through the channel; the channel measurement device performs joint processing on the received channel response measurement sequences of the at least two user equipments, The downlink channel state information CSIT is obtained.
- the technical solution provided by the embodiment of the present invention can reduce the feedback overhead of the user equipment.
- FIG. 1 is a flowchart of a channel measurement method according to an embodiment of the present invention
- FIG. 2 is a flowchart of a channel measurement method according to an embodiment of the present invention
- FIG. 3 is a flowchart of a channel measurement method according to an embodiment of the present invention
- FIG. 4 is a schematic structural diagram of a channel measurement apparatus according to an embodiment of the present invention.
- FIG. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present disclosure.
- FIG. 6 is a schematic structural diagram of a channel measurement apparatus according to an embodiment of the present invention.
- FIG. 7 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
- the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention.
- the embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
- FIG. 1 is a flowchart of a channel measurement method according to an embodiment of the present invention.
- the technical solution of the present embodiment is applied in a wireless communication system including a channel measuring device and at least two user equipments. As shown in FIG. 1, the method includes the following steps:
- Step S100 The channel measurement apparatus sends an antenna domain training sequence to at least two user equipments.
- Step S102 The channel measurement apparatus performs joint processing on the received channel response measurement sequences of the at least two user equipments to obtain downlink channel state information.
- the main body of each of the above steps is a channel measuring device.
- the channel measuring device may be a base station.
- it can be implemented in software or in hardware, or in a combination of software and hardware.
- the channel measurement apparatus may send an antenna domain training sequence to at least two user equipments, where the total number of user equipments in the wireless communication system is not limited, and the channel measurement apparatus may broadcast the antenna domain training sequence in a broadcast manner. Send to each user device.
- the antenna domain training sequence in the present invention is a time domain specific sequence of the measurement channel in the prior art, and the present invention merely shortens the sequence length without making other changes.
- the channel measuring device can receive the channel response sent by at least two user equipments Measurement sequence.
- the channel response measurement sequence is a sequence received by at least two user equipments after the antenna domain training sequence passes through the channel.
- the channel-receiving channel response measurement sequence that it receives may be fed back to the channel measurement device by the user equipment.
- the channel measurement apparatus After receiving the channel response measurement sequence of the at least two user equipments, the channel measurement apparatus carries the information of the channel in the channel response measurement sequence, and the channel between the channel measurement apparatus and the different user equipments
- the channel measurement device can perform joint processing on the channel response measurement sequence of at least two user equipments received by the channel measurement device, thereby obtaining channel state information between the channel measurement device and each user equipment, that is, the downlink CSIT.
- the channel measurement apparatus performs joint processing on the channel response measurement sequence fed back by multiple user equipments to obtain a downlink CSIT, and the antenna domain training sequence transmitted to the user equipment may be much smaller than the number of transmit antennas of the channel measurement apparatus. Therefore, compared with the prior art, the user equipment needs to feed back CSI. In this embodiment, the user equipment only needs to feed back the channel response measurement sequence to the channel measurement device, so that the feedback overhead is small.
- the wireless communication system includes a channel measurement device and at least two user equipments, and the channel measurement device sends an antenna domain training sequence to at least two user equipments, and then receives channel responses sent by at least two user equipments.
- the measurement sequence is a sequence in which the antenna domain training sequence is received by the at least two user equipments after the antenna domain training sequence passes through the channel, and the received channel response measurement sequences of the at least two user equipments are jointly processed to obtain a downlink CSIT.
- FIG. 2 is a flowchart of a channel measurement method according to an embodiment of the present invention.
- the technical solution of the present embodiment is applied in a wireless communication system including a channel measuring device and at least two user equipments. As shown in Figure 2, the method includes:
- Step S200 The user equipment receives an antenna domain training sequence sent by the channel measurement apparatus.
- Step S201 The user equipment sends a channel response measurement sequence to the channel measurement device, so that the channel measurement device performs a joint processing on the received channel response measurement sequence of the at least two user equipments to obtain a downlink CSIT, where the channel response measurement sequence is an antenna domain training sequence.
- the sequence received by the user equipment after the channel is an antenna domain training sequence.
- the execution subject of each of the above steps is a user equipment, and specifically, when implemented, software can be used.
- the implementation of the method can also be implemented by means of hardware, and can also be implemented by a combination of software and hardware.
- the user equipment can receive the antenna domain training sequence sent by the channel measurement device. Since the antenna domain training sequence is a sequence after the channel, the user equipment may send the received antenna domain training sequence, that is, the channel domain training sequence corresponding to the channel response measurement sequence, to the channel measuring device to make the channel.
- the measuring device may perform joint processing according to the channel response measurement sequence to obtain a downlink CSIT between the channel measurement device and the user.
- the user equipment needs to feed back CSI.
- the user equipment only needs to feed back the channel response measurement sequence to the channel measurement device, so that the feedback overhead is small.
- the power consumption of the user equipment can be reduced.
- the wireless communication system includes a channel measurement device and at least two user equipments, and the user equipment receives an antenna domain training sequence sent by the channel measurement device, and then sends a channel response measurement sequence to the channel measurement device, where the channel The response measurement sequence is a sequence received by at least two user equipments after the antenna domain training sequence passes through the channel.
- the technical solution provided by the embodiment of the present invention can reduce the feedback overhead of the user equipment.
- FIG. 3 is a flowchart of a channel measurement method according to an embodiment of the present invention. The technical solution of this embodiment is applied in a wireless communication system including a channel measuring device and at least two user equipments.
- the execution body of step S300 and steps S303 to S305 is a channel measurement device
- the execution body of steps S301 to S302 is a user equipment.
- the channel measurement device may be a base station.
- the wireless communication system has a channel measuring device, K user equipments.
- the number of transmitting antennas of the channel measuring device is M
- the number of receiving antennas of the user equipment is N
- the theoretical antenna domain channel state matrix from the channel measuring device to the ith user equipment is represented as H, H, G £ — , ie, H
- the theoretical antenna domain channel state matrix between the channel measuring device and the different user equipments is ⁇ 3 ⁇ 4:... ; ⁇ ⁇ ⁇
- the antenna domain channel state matrix is between the user equipment and the channel measuring device.
- the channel gain value on different physical channels which is the channel state information. As shown in FIG. 3, the method includes:
- Step S300 The channel measurement apparatus sends an antenna domain training sequence to at least two user equipments.
- the description of this step is the same as step S100, and, in practice, the length of the antenna domain training sequence can be much smaller than the number of transmitting antennas of the channel measuring device.
- Step S301 The user equipment receives an antenna domain training sequence sent by the channel measurement apparatus.
- step S200 The description of this step is the same as that of step S200, and will not be described here.
- Step S302 The user equipment sends a channel response measurement sequence to the channel measurement apparatus.
- step S201 The description of the step is the same as that of step S201, and details are not described herein again.
- Step S303 The channel measurement apparatus receives a channel response measurement sequence sent by at least two user equipments.
- step S101 The description of the step is the same as that of step S101, and details are not described herein again.
- Step S304 The channel measurement apparatus performs joint processing on the channel response measurement sequences of the at least two user equipments according to the preset sparsity set and the antenna domain training sequence, to obtain an angular domain channel state matrix of each user equipment.
- the user equipment may share some scatterers on the channel measuring device end, and therefore, is large in multiple users.
- the CSI of multiple user equipments exhibits joint sparse characteristics, that is, the CSIs of multiple user equipments may have non-zero values at a fixed angle, and are zero at other angles. Therefore, channel measurement The device may perform joint processing on the received channel response measurement sequences of at least two user equipments according to the preset sparsity set and the antenna domain training sequence to obtain an angular domain channel state matrix of each user equipment. .
- the foregoing sparsity set is a preset set of non-zero column numbers in the angular domain channel state matrix of each user equipment, where the angular domain channel state matrix is between the user equipment and the channel measuring device. Channel gain values at different angles.
- the sparsity set is statistical information of CSI sparsity in a multi-user wireless communication system, that is, information about a non-zero angle of channel gain values between multiple user equipments to channel measurement devices, which may be based on The transmission environment of the wireless communication system is preset.
- the above sparsity set s can be expressed as s ⁇ ⁇ v ⁇ i, 2 — i3 ⁇ 4 where the number of non-zero columns indicating the same index value in the angular domain state matrix of each user equipment is as follows: The number of non-zero columns of the angular domain state matrix of the first user equipment. For example, there are two user equipments in the system. The non-zero column in the angular channel state matrix of the first user equipment is ⁇ 1,3,5 ⁇ , and the angular channel state matrix of the second user equipment is non-zero. The column is ⁇ 1,4,6 ⁇ , then it is 1, and both are 3.
- the steps can be divided into the following:
- the channel measuring device converts the antenna domain training sequence to obtain an angular domain training sequence.
- the channel measurement apparatus can perform joint processing on the channel response measurement sequence fed back by each user equipment by using the joint sparse characteristic. Before this, the channel measurement apparatus can first transmit the antenna domain training sequence to each user equipment. Convert to an angular domain training sequence for the angular domain.
- the antenna domain training sequence can be converted by the angular domain conversion matrix ⁇ , for example, when the channel measuring device uses a linear array antenna (Uniform Linear Array)
- the angular transformation matrix ⁇ ⁇ can be
- a ⁇ [e (0), e 3 ⁇ 4);. ', E (i)] S of ee is a natural constant; when the channel measurement apparatus side using various other types of antennas, The 3-D linear antenna or 3-D plane When the antenna is equal, the angular conversion matrix AT has a different expression.
- the meanings of the same symbols in the following are the same as here, and will not be described later.
- the angular domain conversion matrix AT is determined to be unchanged.
- the channel measurement device processes the channel response measurement sequence of each user equipment according to the sparsity set and the range training sequence to obtain a shared channel support set and a first residual amount of each user equipment.
- the channel measurement apparatus may process the channel response measurement sequence of each user equipment according to the preset sparsity set and the range training sequence, to obtain a shared channel support set and each user equipment.
- the first residual amount represents a set of index values of the first non-zero column, where the first non-zero column is a non-zero column with the same index value in the angular channel state matrix of each user equipment, and the first residual quantity is removed.
- the shared channel supports the residual amount of the measured value component produced by the channel response in the set.
- the channel measurement device can initialize the shared channel support set and the first residual amount of each user equipment.
- the channel measurement apparatus may initialize the shared channel support set to an empty set, and initialize a first residual quantity of each user equipment according to the received channel response measurement sequence of each user equipment, for example, initialize with The first residual amount of the user equipment, where R represents the first residual amount of the first user equipment, and represents a channel response measurement sequence of the first user equipment received by the channel measurement apparatus.
- R represents the first residual amount of the first user equipment
- R represents a channel response measurement sequence of the first user equipment received by the channel measurement apparatus.
- the channel measuring device can repeatedly perform the following iterative process:
- the first is that for each user equipment, the channel measurement device estimates the first angular domain channel response of each user equipment according to the first residual amount of the user equipment, the shared channel support set, and the foregoing sparsity set, and correspondingly Selecting an index value of the non-zero column desired by the user equipment in the first angular channel channel response of the user equipment, to obtain an estimated shared channel support set of the user equipment; and second, selecting an estimated shared channel support set of each user equipment The index with the highest frequency of occurrence is added to the shared channel support set; the third is that for each user equipment, the channel measurement device obtains the user according to the channel response measurement sequence, the angular domain training sequence, and the shared channel support set of the user equipment. The first residual amount of equipment.
- the channel measurement device first supports the set and each user according to the shared channel after initialization.
- the first residual amount of the device performs the foregoing first to third, and then re-executes the first to the second according to the shared channel support set processed by the second and third frames and the first residual amount of each user equipment
- the first threshold may be a non-zero index value in the angular channel state matrix of each user equipment in the preset sparsity set. The number of columns.
- the channel measuring device can be based on
- ⁇ represents the estimated shared channel support set of the first user equipment, which is the index of the non-zero column in the angular channel state matrix estimated by the user equipment, R, Table /"
- the first residual amount of the user equipment, ( ⁇ ) ⁇ represents the first angular domain channel response of the first user equipment,
- represents the number of elements in the set ⁇ , and represents the angular channel state of the first user equipment
- the number of non-zero columns of the matrix, ⁇ represents the shared channel support set,
- represents the number of elements in the shared channel support set, df R, represents ( ⁇ ) ⁇ Frobenius
- the channel measuring device can be based on
- the highest frequency index value in the estimated shared channel support set of each user equipment is added to the shared channel support set.
- j' represents the highest frequency index value in the estimated shared channel support set of each user equipment
- ⁇ represents the shared channel support set. Subsequent expressions of the same symbols are the same as here. The set is processed to find the index of the most frequently occurring column and add it to the shared channel support set.
- the estimated shared channel support set of the first user equipment in the first ⁇ is ⁇ 1 , 3 , 5, 7 ⁇
- the estimated shared channel support set of the second user equipment is ⁇ 1 , 3 ⁇
- the ⁇ calculated by the formula (2) is ⁇ 1 , 3 ⁇ .
- the channel measuring device can be based on
- the first residual amount of the user equipment is obtained.
- / represents the identity matrix, representing the shared channel support set
- ⁇ represents the submatrix consisting of the column vectors of the shared channel support set ⁇ in the angular training sequence
- the meanings of the same symbols are the same as here, and will be described later.
- the channel measurement device obtains a channel support set of each user equipment according to the angular domain training sequence, the shared channel support set, the first residual amount of each user equipment, and the sparsity set.
- the channel measurement apparatus may obtain a channel support set for each user equipment according to the angular domain training sequence, the shared channel support set, the residual amount of each user equipment, and the sparsity set.
- the set of channel supports represents a set of index values of the second non-zero column, and the second non-zero column is a non-zero column of the angular channel state matrix of the user equipment.
- the channel measurement apparatus may initialize a channel support set of each user equipment and a second residual quantity of each user equipment, where the second residual quantity is a residual quantity after removing the measured value component generated by the channel response in the channel support set.
- the channel measurement apparatus may initialize a channel support set of each user equipment by using the shared channel support set, that is, set an initial value of a channel support set of each user equipment to a shared channel support set, and use the foregoing first residual quantity.
- the second residual amount is initialized, that is, the initial value of the second residual amount of each user equipment is set to the first residual amount.
- the channel measurement apparatus performs the following iterative process: the first is based on the second residual amount of the user equipment, by estimating the second angular domain channel response of the user equipment and from the second Selecting the non-zero expected by the user equipment in the angular domain channel response
- the index value of the column adds the index value of the non-zero column expected by the user equipment to the channel support set of the user equipment;
- the second parameter is based on the received channel response measurement sequence of the user equipment, the angular domain training sequence, and the user.
- the channel support set of the device obtains the second residual amount of the user equipment.
- the channel measurement apparatus For each user equipment, the channel measurement apparatus performs the first ⁇ and the second ⁇ according to the initialized channel support set and the second residual amount of the user equipment for the first time, and then determines whether the second residual quantity of the user equipment reaches The preset value or the number of repeated operations reaches a preset second threshold. If any of the above conditions are not met, the channel measuring device further follows the first processed channel support set and the second processed user equipment. The second residual amount re-executes the first ⁇ and the second ⁇ , and so on, until the stop condition is satisfied, the second threshold may be ⁇ , that is, the non-corner channel state matrix of the first user equipment in the preset sparsity set The number of zero columns.
- the preset value ⁇ can be set according to the noise energy value of the channel, and the noise energy average of the channel is assumed to be ⁇ 0, then ⁇ generally takes the value ⁇ « "> 1.
- a typical value method is " 2 .
- the channel measurement device can be based on
- the channel measuring device can be based on:
- a second residual amount of the user equipment is obtained.
- the channel measurement device first calculates a shared channel support set common to each user equipment, and then separately calculates a channel support set of each user equipment, thereby determining a corner channel of each user equipment.
- the index value of the non-zero column of the state matrix is the index value of the non-zero column of the state matrix.
- the channel measuring device obtains a corner domain channel state matrix of each user equipment according to a channel support set of each user equipment, an angular domain training sequence, and a received channel response measurement sequence of each user equipment.
- the channel measurement apparatus may obtain each user equipment according to a channel support set of each user equipment, a range training sequence, and a received channel response measurement sequence of each user equipment.
- the value of the non-zero column of the angular domain channel state matrix may be obtained.
- the channel measuring device can be based on:
- the channel measuring device obtains the angular domain channel state matrix of each user equipment by setting the value of the angular domain channel state matrix of each user equipment to zero unless the zero column is set according to the number of transmitting antennas.
- Step S305 The channel measurement device converts the angular domain channel state matrix of each user equipment to obtain a downlink CSIT.
- the channel measurement apparatus may perform: converting the angular domain channel state matrix of the first user equipment, and finally obtaining a downlink CSIT between the channel measurement apparatus and each user equipment.
- the channel measurement device may first group all user equipments according to the channel conditions of all user equipments in the system; and then send the antenna domain training sequence to each user equipment in the same group, and then follow steps S303 ⁇ S305.
- the described method performs joint processing on the channel response measurement sequence of each user equipment in each group, and finally obtains the downlink CSIT.
- the dimension of the channel response measurement sequence that the user equipment feeds back to the channel measurement device is N times T, because the technical solution of the embodiment is that the channel measurement device is configured for at least two user equipments.
- the channel response measurement sequence is jointly processed, so in practice, the length T of the channel measurement device transmission sequence can be much smaller than the number of its transmission antennas M.
- the channel state matrix fed back to the channel measurement device by the user equipment is N times. M, since T is much smaller than M, the solution of this embodiment can reduce the feedback overhead of the user equipment.
- the wireless communication system includes a channel measurement device and With two less user equipments, the channel measurement device sends an antenna domain training sequence to at least two user equipments, and then receives a channel response measurement sequence sent by at least two user equipments, the channel response measurement sequence being at least an antenna domain training sequence after being channeled
- the sequence received by the two user equipments performs joint processing on the received channel response measurement sequences of at least two user equipments to obtain a downlink CSIT.
- the technical solution provided by the embodiment of the present invention can reduce the feedback overhead of the user equipment.
- a component can be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer.
- an application running on a computing device and a computing device can be a component.
- One or more components may reside in a process and/or execution thread, and the components may be located on one computer and/or distributed between two or more computers.
- these components can execute from various computer readable media having various data structures stored thereon.
- a component may, for example, be based on a signal having one or more data packets (eg, data from two components interacting with another component between the local system, the distributed system, and/or the network, such as the Internet interacting with other systems) Communicate through local and/or remote processes.
- data packets eg, data from two components interacting with another component between the local system, the distributed system, and/or the network, such as the Internet interacting with other systems
- UE User Equipment
- the access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, or a Personal Digital Assistant (PDA).
- SIP Session Initiation Protocol
- WLL Wireless Local Loop
- PDA Personal Digital Assistant
- the apparatus for channel measurement may be a base station.
- Base station can be used In communication with a mobile device, the base station may be a wireless (WiFi) Access Point (AP), or a Global System of Mobile communication (GSM) or Code Division Multiple Access (Code Division Multiple Access).
- the Base Transceiver Station (BTS) in the CDMA system can also be a base station (NodeB, NB for short) in Wideband Code Division Multiple Access (WCDMA), or it can be a long-term evolution ( In the Long Term Evolution (LTE), the evolved base station (Evolutional Node B, eNB or eNodeB for short), or the relay station or access point, or the base station equipment in the future 5G network.
- LTE Long Term Evolution
- Evolutional Node B, eNB or eNodeB for short the relay station or access point, or the base station equipment in the future 5G network.
- FIG. 4 is a channel provided by an embodiment of the present invention.
- the wireless communication system includes a channel measuring device and at least two user equipments. As shown in FIG. 4, the channel measuring device 1 includes: a transmitting module 10, a receiving module 11, and a processing module 12.
- the sending module 10 is configured to send an antenna domain training sequence to at least two user equipments;
- the receiving module 11 is configured to receive a channel response measurement sequence sent by at least two user equipments, where the channel response measurement sequence is after the antenna domain training sequence passes through the channel.
- the processing module 11 is configured to perform joint processing on the received channel response measurement sequences of the at least two user equipments to obtain downlink channel state information CSIT.
- the processing module 11 is specifically configured to: perform joint processing on the channel response measurement sequences of the at least two user equipments according to the preset sparsity set and the antenna domain training sequence, to obtain a corner channel of each user equipment.
- the state matrix, the sparsity set is a preset set of non-zero column numbers in the angular domain channel state matrix of each user equipment; and the angular domain channel state matrix of each user equipment is converted to obtain a downlink CSIT.
- the processing module 11 is specifically configured to: convert the antenna domain training sequence, Obtaining an angular domain training sequence; processing a channel response measurement sequence of each user equipment according to the sparsity degree set and the angular domain training sequence, to obtain a shared channel support set and a first residual quantity of each user equipment, where the first residual quantity is Removing the residual amount after the measured value component generated by the channel response in the shared channel support set; obtaining each user equipment according to the angular domain training sequence, the shared channel support set, the first residual amount of each user equipment, and the sparsity degree set
- the channel support set is obtained according to the channel support set of each user equipment, the angular domain training sequence, and the received channel response measurement sequence of each user equipment, to obtain the angular domain channel state matrix of each user equipment.
- the processing module 11 is specifically configured to: initialize a shared channel support set and a first residual amount of each user equipment; repeatedly perform the following steps: according to the first residual amount of each user equipment, the shared channel support set, and a sparsity set, estimating a first angular domain channel response of each user equipment, and selecting an index value of the non-zero column desired by the user equipment from a first angular domain channel response of the corresponding user equipment, to obtain an estimated sharing of the user equipment Channel support set; adding the highest frequency index value in the estimated shared channel support set of each user equipment to the shared channel support set; according to the channel response measurement sequence, the angular domain training sequence, and the shared channel support set of each user equipment, Obtaining a first residual amount of the user equipment; until the number of repeated operations reaches a preset first threshold.
- the processing module 11 is specifically configured to: initialize a channel support set of each user equipment and a second residual quantity of each user equipment, where the second residual quantity is a measured value component generated by removing a channel response in the channel support set. The remaining residual amount; repeating the following steps: according to the second residual amount of the user equipment, by estimating the second angular domain channel response of the user equipment and selecting the non-zero desired by the user equipment from the second angular domain channel response The index value of the column is added to the channel support set of the user equipment by the non-zero column index value expected by the user equipment; according to the received channel response measurement sequence of the user equipment, the angular domain training sequence, and the channel support of the user equipment Collecting, obtaining a second residual amount of the user equipment, where the second residual amount is a residual amount after removing the measured value component generated by the channel response in the channel support set of the user equipment; until the residual amount of the user equipment reaches a preset value Or the number of repeated operations reaches a preset second threshold.
- the processing module 11 is specifically configured to: obtain a corner channel state matrix of each user equipment according to a channel support set of each user equipment, a range training sequence, and a received channel response measurement sequence of each user equipment.
- processing module 11 is specifically used to:
- [Omega] represents estimation of the shared channel supporting user equipment set. Representing a sub-matrix composed of column vectors belonging to the set ⁇ in the angular training sequence, the surface water
- the number of elements in the small set ⁇ , small - the number of non-zero columns of the angular channel state matrix of the user equipment, ⁇ represents the shared channel support set
- the processing module 11 is specifically used for:
- ⁇ indicates a shared channel support set, indicating a total number of at least two user equipments, ⁇ , indicating an estimated shared channel support set of the first user equipment .
- processing module 11 is specifically used to:
- the first residual of the table /"v i user equipment represents the identity matrix, ⁇ table
- shared channel support set, ⁇ indicates that the index in the angular training sequence belongs to the sub-matrix composed of the column vector of the shared channel support ⁇ : (f represents the pseudo-inverse of ⁇ , F, , indicating the channel response measurement sequence of each user equipment connected.
- processing module 11 is specifically used to:
- ⁇ represents the channel support set of the i-th user equipment
- ⁇ represents the column of the angular domain training sequence
- H R 'table-'/ represents the residual amount of the first user equipment
- H R 'table-'/ represents the residual amount of the first user equipment
- H R 'table-'/ represents the residual amount of the first user equipment
- H R 'table-'/ represents the residual amount of the first user equipment
- H R 'table-'/ represents the residual amount of the first user equipment
- H R 'table-'/ represents the residual amount of the first user equipment
- H R 'table-'/ represents the residual amount of the first user equipment
- H R 'table-'/ represents the residual amount of the first user equipment
- H R 'table-'/ represents the residual amount of the first user equipment
- H R 'table-'/ represents the residual amount of the first user equipment
- H R 'table-'/ represents the residual amount of the first user equipment
- H R 'table-'/ represents the residual amount of
- the second residual of the i-th user equipment is represented by: / represents an identity matrix, represents a channel support set of the i-th user equipment, and ⁇ represents a child formed by combining column vectors belonging to the channel support set in the angular domain training sequence.
- the matrix, the pseudo-inverse of the representation, - Y t H , Y t represents the received channel response measurement sequence for each user equipment.
- processing module 11 is specifically used to:
- the channel measuring device 1 is a base station.
- the wireless communication system includes a channel measurement device 1 and at least two user equipments, and the channel measurement device 1 sends an antenna domain training sequence to at least two user equipments, and then receives at least two user equipments. a channel response measurement sequence, wherein the channel response measurement sequence is a sequence received by at least two user equipments after the antenna domain training sequence passes through the channel, and the channel response measurement sequences of the at least two user equipments are jointly processed to obtain a downlink CSIT. .
- the technical solution provided by the embodiment of the present invention can reduce the feedback of the user equipment. Overhead.
- FIG. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
- the wireless communication system includes a channel measurement device and at least two user equipments. As shown in FIG. 5, the user equipment 2 includes: a receiving module 20 and a sending module 21.
- the receiving module 20 is configured to receive an antenna domain training sequence sent by the channel measurement device
- the sending module 21 is configured to send a channel response measurement sequence to the channel measurement device, so that the channel measurement device measures the channel response of the received at least two user equipments.
- the sequence is jointly processed to obtain downlink channel state information CSIT, and the channel response measurement sequence is a sequence received by the user equipment after the antenna domain training sequence passes through the channel.
- the wireless communication system includes a channel measurement device and at least two user equipments 2, and the user equipment 2 receives the antenna domain training sequence sent by the channel measurement device, and then sends a channel response measurement sequence to the channel measurement device.
- the channel response measurement sequence is a sequence received by at least two user equipments after the antenna domain training sequence passes through the channel.
- FIG. 6 is a schematic structural diagram of a channel measurement apparatus according to an embodiment of the present invention.
- the wireless communication system includes a channel measurement device and at least two user equipments. As shown in FIG. 6, the channel measuring device 3 includes a transmitter 30, a receiver 31, and a processor 32.
- the transmitter 30 is configured to send an antenna domain training sequence to at least two user equipments; the receiver 31 is configured to receive a channel response measurement sequence sent by at least two user equipments, where the channel response measurement sequence is after the antenna domain training sequence passes through the channel.
- the sequence received by the at least two user equipments; the processor 32 is configured to perform joint processing on the received channel response measurement sequences of the at least two user equipments to obtain downlink channel state information CSIT.
- the processor 32 is specifically configured to: perform joint processing on the channel response measurement sequences of the at least two user equipments according to the preset sparsity set and the antenna domain training sequence, to obtain a corner channel of each user equipment.
- the state matrix, the sparsity set is a preset set of non-zero column numbers in the angular domain channel state matrix of each user equipment; and the angular domain channel state matrix of each user equipment is converted to obtain a downlink CSIT.
- the processor 32 is specifically configured to: convert the antenna domain training sequence, Going to the angular domain training sequence; processing the channel response measurement sequence of each user equipment according to the sparsity degree set and the angular domain training sequence, to obtain a shared channel support set and a first residual quantity of each user equipment, the first residual quantity is Removing the residual amount after the measured value component generated by the channel response in the shared channel support set; obtaining each user equipment according to the angular domain training sequence, the shared channel support set, the first residual amount of each user equipment, and the sparsity degree set
- the channel support set is obtained according to the channel support set of each user equipment, the angular domain training sequence, and the received channel response measurement sequence of each user equipment, to obtain the angular domain channel state matrix of each user equipment.
- the processor 32 is specifically configured to: initialize a shared channel support set and a first residual amount of each user equipment; repeatedly perform the following steps: according to the first residual amount of each user equipment, the shared channel support set, and a sparsity set, estimating a first angular domain channel response of each user equipment, and selecting an index value of the non-zero column desired by the user equipment from a first angular domain channel response of the corresponding user equipment, to obtain an estimated sharing of the user equipment Channel support set; adding the highest frequency index value in the estimated shared channel support set of each user equipment to the shared channel support set; according to the channel response measurement sequence, the angular domain training sequence, and the shared channel support set of each user equipment, Obtaining a first residual amount of the user equipment; until the number of repeated operations reaches a preset first threshold.
- the processor 32 is specifically configured to: initialize a channel support set of each user equipment and a second residual quantity of each user equipment, where the second residual quantity is a measured value component generated by removing a channel response in the channel support set. The remaining residual amount; repeating the following steps: according to the second residual amount of the user equipment, by estimating the second angular domain channel response of the user equipment and selecting the non-zero desired by the user equipment from the second angular domain channel response The index value of the column is added to the channel support set of the user equipment by the non-zero column index value expected by the user equipment; according to the received channel response measurement sequence of the user equipment, the angular domain training sequence, and the channel support of the user equipment Collecting, obtaining a second residual amount of the user equipment, where the second residual amount is a residual amount after removing the measured value component generated by the channel response in the channel support set of the user equipment; until the residual amount of the user equipment reaches a preset value Or the number of repeated operations reaches a preset second threshold.
- the processor 32 is specifically configured to: obtain a corner channel state matrix of each user equipment according to a channel support set of each user equipment, a range training sequence, and a received channel response measurement sequence of each user equipment.
- processor 32 is specifically used to:
- ⁇ represents estimation of the shared channel set user equipment supports, ⁇ .
- ⁇ represents estimation of the shared channel set user equipment supports, ⁇ .
- ⁇ Representing a sub-matrix composed of column vectors belonging to the set ⁇ in the angular training sequence, the surface water
- processor 32 is specifically used to:
- ⁇ indicates a shared channel support set, indicating the total number of at least two user equipments, ⁇ , indicating the estimated shared channel support of the first user equipment set.
- processor 32 is specifically used to:
- indicating a first residual quantity of the first user equipment, / indicating an identity matrix, indicating a shared channel support set, indicating that the index in the angular domain training sequence belongs to a shared matrix support set ⁇ : a sub-matrix consisting of column vectors, indicating ⁇ 3 ⁇ 4 Pseudo-inverse, , i , represents the received channel response measurement sequence for each user equipment.
- processor 32 is specifically used to:
- ⁇ represents the channel support set of the user equipment
- w represents the column of the angular training sequence, the residual amount of the user equipment, and the second angular channel response of the first user equipment, ⁇ R
- processor 32 is specifically used to:
- the second residual amount of the first user equipment is represented, / represents an identity matrix, represents a channel support set of the i-th user equipment, and ⁇ represents a child formed by combining column vectors belonging to the channel support set in the angular domain training sequence.
- the matrix, the pseudo-inverse of the representation, - Y t H , Y t represents the received channel response measurement sequence for each user equipment.
- the channel measuring device 3 is a base station.
- the wireless communication system includes a channel measurement device 3 and at least two user equipments, and the channel measurement device 3 sends an antenna domain training sequence to at least two user equipments, and then receives at least two user equipments. a channel response measurement sequence, wherein the channel response measurement sequence is a sequence received by the antenna domain training sequence by the at least two user equipments after passing through the channel, and the channel response measurement sequences of the at least two user equipments are jointly processed to obtain a CSIT.
- the technical solution provided by the embodiment of the present invention can reduce the feedback overhead of the user equipment.
- FIG. 7 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
- the wireless communication system includes a channel measurement device and at least two user equipments. As shown in FIG. 7, the user equipment 4 includes: a receiver 40 and a transmitter 41.
- the receiver 40 is configured to receive an antenna domain training sequence sent by the channel measurement device
- the transmitter 41 is configured to send a channel response measurement sequence to the channel measurement device to enable the channel measurement device to measure channel response of the received at least two user equipments.
- the sequence is jointly processed to obtain downlink channel state information CSIT, and the channel response measurement sequence is a sequence received by the user equipment after the antenna domain training sequence passes through the channel.
- the wireless communication system includes a channel measurement device and at least two user equipments 4.
- the user equipment 4 receives the antenna domain training sequence sent by the channel measurement device, and then sends a channel response measurement sequence to the channel measurement device.
- the channel response measurement sequence is a sequence received by at least two user equipments after the antenna domain training sequence passes through the channel.
- the present invention provides a system comprising the channel measuring device 1 of Fig. 4 and at least two user devices 2 of Fig. 5.
- the present invention also provides a system comprising the channel measuring device 1 of Fig. 6 and at least two user devices 2 of Fig. 7.
- the wireless communication system includes a channel measurement device and at least two user equipments, and the channel measurement device sends an antenna domain training sequence to at least two user equipments, and then receives channel responses sent by at least two user equipments.
- the measurement sequence is a sequence in which the antenna domain training sequence is received by the at least two user equipments after the antenna domain training sequence passes through the channel, and the received channel response measurement sequences of the at least two user equipments are jointly processed to obtain a downlink CSIT.
- the technical solution provided by the embodiment of the present invention can reduce the feedback overhead of the user equipment.
- the disclosed apparatus and method may be implemented in other manners.
- the device embodiments described above are only schematic.
- the division of the unit or module is only a logical function division.
- there may be another division manner for example, multiple units or modules may be used. Combined or can be integrated into another system, or some features can be ignored, or not executed.
- the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling of devices or modules or The communication connection can be in electrical, mechanical or other form.
- the modules described as separate components may or may not be physically separate.
- the components displayed as modules may or may not be physical modules, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the objectives of the solution of the embodiment.
- the aforementioned program can be stored in a computer readable storage medium.
- the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.
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Abstract
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RU2016146917A RU2653466C1 (ru) | 2014-04-30 | 2014-04-30 | Способ измерения канала, устройство измерения канала, абонентская станция и система |
JP2016565452A JP6392893B2 (ja) | 2014-04-30 | 2014-04-30 | チャネル測定方法、チャネル測定装置、ユーザ機器およびシステム |
PCT/CN2014/076591 WO2015165070A1 (zh) | 2014-04-30 | 2014-04-30 | 信道测量方法、信道测量装置、用户设备及*** |
BR112016025486A BR112016025486A2 (pt) | 2014-04-30 | 2014-04-30 | método de medição de canal, aparelho de medição de canal, equipamento de usuário, e sistema |
EP14891015.1A EP3131339B1 (en) | 2014-04-30 | 2014-04-30 | Channel measurement method and device |
CN201480078449.8A CN106233783B (zh) | 2014-04-30 | 2014-04-30 | 信道测量方法、信道测量装置、用户设备及*** |
US15/338,141 US10057799B2 (en) | 2014-04-30 | 2016-10-28 | Channel measurement method, channel measurement apparatus, user equipment, and system |
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US10205491B2 (en) * | 2015-09-28 | 2019-02-12 | Futurewei Technologies, Inc. | System and method for large scale multiple input multiple output communications |
KR101995882B1 (ko) * | 2017-10-11 | 2019-07-04 | 서울대학교산학협력단 | 시분할 이중통신 시스템에서 상향링크 전송 방법 및 장치 |
US10693620B2 (en) | 2017-10-27 | 2020-06-23 | Ofinno, Llc | Bandwidth part configuration and operation |
CN112702288B (zh) * | 2020-12-23 | 2022-03-29 | 华中科技大学 | 一种低导频开销的水声ofdm通信***信道估计方法 |
CN113411107B (zh) * | 2021-06-23 | 2022-07-01 | 内蒙古大学 | 一种基于波束束的毫米波大规模mimo***宽带信道估计方法 |
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JP6392893B2 (ja) | 2018-09-19 |
CN106233783B (zh) | 2020-02-14 |
US20170048735A1 (en) | 2017-02-16 |
CN106233783A (zh) | 2016-12-14 |
EP3131339B1 (en) | 2020-01-08 |
RU2653466C1 (ru) | 2018-05-08 |
US10057799B2 (en) | 2018-08-21 |
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