CN103532607B - The selection antenna for base station of extensive mimo system and user terminal method - Google Patents
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Abstract
The selection antenna for base station of a kind of extensive mimo system and user terminal method, step one, be defined below selection pattern: described selection pattern includes: A class, first carries out user terminal selecting, then the substep carrying out antenna for base station selection selects pattern；B class, user terminal selecting selects the Combining Choice Model combined with antenna for base station；Step 2, according to the pattern of selection, utilizing instantaneous channel state information or statistical channel status information that base station obtains, or channel relevancy degree throughput-maximized according to extensive mimo system minimizes criterion and selects user terminal, maximizes criterion according to throughput of system and selects antenna for base station.The present invention effectively reduces complexity and the cost that extensive mimo system realizes, and optimizes systematic function simultaneously, improves throughput of system.
Description
Technical field
The present invention relates to selection antenna for base station and the user terminal method of extensive mimo system, belong to extensive mimo system field.
Background technology
Extensive MIMO (Very Large MIMO or Massive MIMO, MIMO refers to that multiple-input and multiple-output (Multi-input Multi-output) is a kind of model for describing multi-aerial radio communication system, the most independently transmitted signal of multiple antennas of transmitting terminal can be utilized, receive with multiple antennas at receiving terminal simultaneously and recover prime information) with its distinctive advantage: obtain the channel capacity of higher multiple, lower energy expenditure, space region indexing the most accurately, relatively inexpensive hardware realization etc., it is thus achieved that the suitable concern of wireless communication field.The base station end of extensive mimo system is configured with the antenna of a large amount of number, such as 64, or 128, when all antennas are involved in data transmission, need and the same number of radio frequency link of antenna for base station, simultaneously in extensive mimo system, along with the increase of base station end number of antennas, dependency between different user channel is increased dramatically along with the increase of number of users, causes the implementation complexity of system and cost more much higher than common mimo system.Obtain more excellent systematic function to reduce cost and complexity simultaneously, often by selecting antenna for base station to realize, i.e. select suitable antenna for base station subset to participate in transmission, close portion divided antenna.
In actual extensive mimo system, base station is difficult to obtain accurate instantaneous channel state information, and the statistical property of channel is slow relative to instantaneous channel state information change, it is believed that base station can obtain more accurate statistical channel status information relatively easily.Based on background as above, channel condition information is utilized to select antenna for base station and user terminal to become a kind of possible.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides selection antenna for base station and the user method of a kind of extensive mimo system, utilize instantaneous channel state information or statistical channel status information that base station obtains, maximize according to throughput of system or channel relevancy minimizes criterion and selects user terminal, maximize criterion according to throughput of system and select antenna for base station, achieve and utilize channel condition information to select antenna for base station and the method for user terminal, achieve and utilize channel condition information to select antenna for base station and the method for user terminal, solve extensive mimo system and realize complexity, the problem that cost is high.
For solving above-mentioned technical problem, the technical solution used in the present invention is: the selection antenna for base station of extensive mimo system and user terminal method, comprises the following steps:
Step one, extensive mimo system is defined below selection pattern；Described selection pattern includes: A class, first carries out user terminal selecting, then the substep carrying out antenna for base station selection selects pattern；B class, user terminal selecting selects the Combining Choice Model combined with antenna for base station；Wherein A class includes: A.1 pattern: first carry out user terminal selecting, then the substep carrying out antenna for base station selection selects pattern to gradually form the selection pattern that number of antennas is successively decreased；A.2 pattern: first carry out user terminal selecting, then the substep carrying out antenna for base station selection selects the selection pattern that pattern gradually forms and number of antennas is incremented by；B class includes: B.1 pattern, and user terminal selecting selects the selection pattern that the Combining Choice Model combined and number of antennas are successively decreased with antenna for base station；B.2 pattern, user terminal selecting selects the selection pattern that the Combining Choice Model combined and number of antennas are incremented by with antenna for base station；
Step 2, according to the pattern of selection, utilize instantaneous channel state information or statistical channel status information that base station obtains, or channel relevancy degree throughput-maximized according to extensive mimo system minimizes criterion and selects user terminal, selects antenna for base station according to the throughput-maximized criterion of mimo system；Described channel relevancy degree is by determining with following formula 1 and formula 2:
When utilizing instantaneous channel state information, the degree of relevancy of user terminal k and user terminal j to the channel of base station is
When utilizing statistical channel status information, the degree of relevancy of user terminal k and user terminal j to the channel of base station is
CorrI<k, j>and CorrSThe numerical value of<k, j>is the least, and dependency is the least；Wherein, HkRepresent the user terminal k channel vector to base station,Represent user terminal k to the covariance matrix of BTS channel, k={1 ..., K}, | | | |fNot Luo Beini this norm of crow of representing matrix, tr{ } representing matrix asks mark computing, and K is positive integer；
When the pattern of selection be A.1 time, antenna for base station selects to comprise the following steps with user terminal selecting:
(1) activate all antenna for base station, definition antenna for base station collection be combined into Ψ=1 ..., M}, wherein M is positive integer；
(2) in the case of all antenna for base station are involved in data transmission, utilize the instantaneous channel state information or statistical channel status information obtained, calculate throughput of system or channel relevancy degree, maximize according to throughput of system or channel relevancy minimizes criterion, select the user terminal combination U that throughput of system maximizes or channel relevancy minimizes that sends as an envoy toopt；
(3) continuous print α base station antenna is closed successively；
(4) throughput of system of antenna for base station subset S of the antenna for base station of state of activation is calculated；
(5) repeat (3) and (4), travel through all antenna for base station；
(6) maximize criterion according to throughput of system, select antenna for base station subset S during throughput of system maximum；
When the pattern of selection be A.2 time, antenna for base station selects to comprise the following steps with user terminal selecting:
(1) all antenna for base station are activated, in the case of all antenna for base station are involved in data transmission, utilize the instantaneous channel state information or statistical channel status information obtained, calculate throughput of system or channel relevancy degree, maximize according to throughput of system or channel relevancy minimizes criterion, select the user terminal combination U that throughput of system maximizes or channel relevancy minimizes that sends as an envoy toopt；
(2) all antenna for base station are closed；
(3) continuous print α base station antenna is activated successively；
(4) antenna for base station subset S of the antenna for base station of state of activation is calculatedmThroughput of system；
(5) repeat (3) and (4), travel through all antenna for base station；
(6) maximize criterion according to throughput of system, select antenna for base station subset S during throughput of system maximumm；
When the pattern of selection be B.1 time, antenna for base station selects to comprise the following steps with user terminal selecting:
(1) all antenna for base station are activated；
(2) continuous print α base station antenna is closed successively；
(3) in antenna for base station subset S of antenna for base station of state of activationmIn the case of determining, utilize the instantaneous channel state information or statistical channel status information obtained, calculate throughput of system or channel relevancy degree, maximize according to throughput of system or channel relevancy minimizes criterion, select the user terminal combination U that throughput of system maximizes or channel relevancy minimizes that sends as an envoy toopt；
(4) antenna for base station subset S is calculatedmThroughput of system；
(5) repeat (3) and (4), travel through all antenna for base station；
(6) maximize criterion according to throughput of system, select antenna for base station subset S during throughput of system maximummAnd user terminal combination Uopt；
When the pattern of selection be B.2 time, antenna for base station selects to comprise the following steps with user terminal selecting:
(1) all antenna for base station are closed；
(2) continuous print α base station antenna is activated successively；
(3) in antenna for base station subset S of antenna for base station of state of activationmIn the case of determining, utilize the instantaneous channel state information or statistical channel status information obtained, calculate throughput of system or channel relevancy degree, maximize according to throughput of system or channel relevancy minimizes criterion, select the user terminal combination U that throughput of system maximizes or channel relevancy minimizes that sends as an envoy toopt；
(4) antenna for base station subset S is calculatedmThroughput of system；
(5) repeat (3) and (4), travel through all antenna for base station；
(6) maximize criterion according to throughput of system, select antenna for base station subset S during throughput of system maximummAnd user terminal combination Uopt；α is the positive integer within 1-5.
Further, the process of the statistical channel status information that base station obtains is: feeds back to base station or base station after being added up the instantaneous channel state information in transmitting procedure by user terminal and adds up the instantaneous channel state information value of feedback in transmitting procedure；Reduce feedback overhead, reduce the complexity of extensive mimo system.
When utilizing transient channel information, need in each moment, channel status to be fed back；Statistic channel information is feedback after the Information Statistics to a transmission period, and feedback overhead is less.
The selection of four kinds of patterns is the calculating disposal ability according to system base-station equipment, according to implementation complexity and the requirement to throughput performance, and selects different selection patterns.Each pattern all can work alone, and time practical, certain base station is adapted to corresponding certain pattern work.Certainly, also it is not excluded for base station and changes certain pattern according to the situation of handling capacity or portfolio so that the work efficiency of system base-station is higher.
Beneficial effects of the present invention: 1, the present invention utilizes the instantaneous channel state information or statistical channel status information that base station obtains, maximize according to throughput of system or channel relevancy minimizes criterion and selects user terminal, maximize criterion according to throughput of system and select antenna for base station, achieve and utilize channel condition information to select antenna for base station and the method for user terminal, effectively reduce complexity and cost that extensive mimo system realizes, optimize systematic function simultaneously, improve throughput of system；2, the process of the statistical channel status information that the base station of the present invention obtains, reduces feedback overhead, reduces the complexity of extensive mimo system.Four kinds of algorithms of the present invention can bring certain selection gain, and its performance is superior to all antennas and is involved in the situation of transmission.Wherein, the complexity of Combination selection is higher than substep, and performance is more preferable；(A.1, B.1) complexity is incremented by than number of antennas that (A.2, height B.2), performance is more preferable for pattern that number of antennas is successively decreased.So, model selection can be carried out according to the disposal ability of base station and the requirement to systematic function in actual system.
Accompanying drawing explanation
Fig. 1 is the flow chart of the present invention.
Fig. 2 be the present invention select pattern be A.1 time flowchart.
Fig. 3 be the present invention select pattern be A.2 time flowchart.
Fig. 4 be the present invention select pattern be B.1 time flowchart.
Fig. 5 be the present invention select pattern be B.2 time flowchart.
Fig. 6 is the structure chart of the extensive mimo system in the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is further described.
It is illustrated in figure 1 the flow chart of the present invention, the selection antenna for base station of extensive mimo system and user terminal method, comprise the following steps:
Step one, selects different selection patterns；Described selection pattern includes: A class, first carries out user terminal selecting, then the substep carrying out antenna for base station selection selects pattern；B class, user terminal selecting selects the Combining Choice Model combined with antenna for base station；Wherein A class includes: A.1 class, the selection pattern that number of antennas is successively decreased；A.2 the selection pattern that class number of antennas is incremented by；B class includes: B.1 class, the selection pattern that number of antennas is successively decreased；B.2 the selection pattern that class number of antennas is incremented by；
Step 2, according to the pattern of selection, utilize instantaneous channel state information or statistical channel status information that base station obtains, maximize according to throughput of system or channel relevancy minimizes criterion and selects user terminal, maximize criterion according to throughput of system and select antenna for base station；Described channel relevancy degree is determined by following (formula 1) and (formula 2)
When utilizing instantaneous channel state information, the degree of relevancy of user terminal k and user terminal j to the channel of base station is
When utilizing statistical channel status information, the degree of relevancy of user terminal k and user terminal j to the channel of base station is
CorrI<k, j>and CorrSThe numerical value of<k, j>is the least, and dependency is the least；Wherein, HkRepresent the user terminal k channel vector to base station,Represent user terminal k to the covariance matrix of BTS channel, k={1 ..., K}, | | | |fNot Luo Beini this norm of crow of representing matrix, tr{ } representing matrix asks mark computing, and K is positive integer；
As shown in Figure 2: when the pattern of selection be A.1 time, antenna for base station selects to comprise the following steps with user terminal selecting:
(1) activate all antenna for base station, definition antenna for base station collection be combined into Ψ=1 ..., M}, initialize antenna for base station subset be S, S=Ψ, defines indic={1 ..., M/ α }, index=0, count=0, wherein M is positive integer, and α is the antenna for base station radical closed in (3)；α is the positive integer (lower same) between 1-5.The base station 1-5 root antenna that i.e. can simultaneously close off.α typically takes 1-2.
(2) in the case of all antenna for base station are involved in data transmission, utilize the instantaneous channel state information or statistical channel status information obtained, calculate throughput of system or channel relevancy degree, maximize according to throughput of system or channel relevancy minimizes criterion, select the user terminal combination U that throughput of system maximizes or channel relevancy minimizes that sends as an envoy toopt；
(3) closing continuous print α base station antenna [(m-1) α+1:m α] successively, wherein m is the index of traversal antenna for base station, m ∈ indic；；
(4) antenna for base station subset S of the antenna for base station of state of activation is calculatedm=S the throughput of system of { [(m-1) α+1:m α] }, update index=index ∪ m, indic=indic index, S=S Sm, count=count+1；
(5) repeat (3) and (4), until indic=Φ, travel through all antenna for base station；
(6) maximize criterion according to throughput of system, select antenna for base station subset S during throughput of system maximumm。
By above step can the pattern of selection be A.1 time, optimum base station antenna subset and user side combine: { Sopt,Uopt}=argmax{Sm,Uopt}。
As shown in Figure 3 when the pattern of selection be A.2 time, antenna for base station selects to comprise the following steps with user terminal selecting:
(1) all antenna for base station are activated, definition antenna for base station collection is combined into Ψ={ 1, ..., M}, wherein M is positive integer, in the case of all antenna for base station are involved in data transmission, utilize the instantaneous channel state information or statistical channel status information obtained, calculate throughput of system or channel relevancy degree, maximize according to throughput of system or channel relevancy minimizes criterion, select the user terminal combination U that throughput of system maximizes or channel relevancy minimizes that sends as an envoy toopt；
(2) closing all antenna for base station, initializing antenna for base station subset is S=Φ, defines indic={1 ..., M/ α }, index=0, count=0, α are the radical activating antenna for base station in (3)；
(3) activating continuous print α base station antenna [(m-1) α+1:m α] successively, wherein m is the index of traversal antenna for base station, m ∈ indic；
(4) antenna for base station subset S of the antenna for base station of state of activation is calculatedm=S the throughput of system of { [(m-1) α+1:m α] }, update index=index ∪ m, indic=indic index, S=S ∪ Sm, count=count+1；
(5) repeat (3) and (4), until indic=Φ, travel through all antenna for base station；
(6) maximize criterion according to throughput of system, select antenna for base station subset S during throughput of system maximumm.By above step can the pattern of selection be A.2 time, optimum base station antenna subset and user side combine: { Sopt,Uopt}=argmax{Sm,Uopt}。
Be referred to document: X.Gao, O.Edfors, F.Rusek, and F.Tufvesson, " Linear pre-coding performance in measured very-large MIMO channels, " in Proc.IEEE Vehicular Technology
(VTC), Conf. San Francisco, CA, US, Sept.2011, pp.1-5. have channel relevancy and quantitative analysis of handling up between user.
As shown in Figure 4 when the pattern of selection be B.1 time, antenna for base station selects to comprise the following steps with user terminal selecting:
(1) activate all antenna for base station, definition antenna for base station collection be combined into Ψ=1 ..., M}, initialize antenna for base station subset be S, S=Ψ, defines indic={1 ..., M/ α }, index=0, count=0, wherein M is positive integer, and α is the antenna for base station radical closed in (2)；
(2) closing continuous print α base station antenna [(m-1) α+1:m α] successively, wherein m is the index of traversal antenna for base station, wherein m ∈ indic；
(3) in antenna for base station subset S of antenna for base station of state of activationm=S in the case of { [(m-1) α+1:m α] } determine, utilize the instantaneous channel state information or statistical channel status information obtained, calculate throughput of system or channel relevancy degree, maximize according to throughput of system or channel relevancy minimizes criterion, select the user terminal combination U that throughput of system maximizes or channel relevancy minimizes that sends as an envoy toopt
(4) antenna for base station subset S is calculatedmThroughput of system, update index=index ∪ m, indic=indic index, S=S Sm, count=count+1；
(5) repeat (3) and (4), until indic=Φ, travel through all antenna for base station；
(6) maximize criterion according to throughput of system, select antenna for base station subset S during throughput of system maximummAnd user terminal combination Uopt。
By above step can the pattern of selection be B.1 time, optimum base station antenna subset and user side combine: { Sopt,Uopt}=argmax{Sm,Uopt}。
As shown in Figure 5 when the pattern of selection be B.2 time, antenna for base station selects to comprise the following steps with user terminal selecting:
(1) close all antenna for base station definition antenna for base station collection be combined into Ψ=1 ..., M}, initialize antenna for base station subset be S, S=Ψ, defines indic={1 ..., M/ α }, index=0, count=0, wherein M is positive integer, and α is the antenna for base station radical activated in (2)；
(2) activating continuous print α base station antenna [(m-1) α+1:m α] successively, wherein m is the index of traversal antenna for base station, wherein m ∈ indic；
(3) in antenna for base station subset S of antenna for base station of state of activationm=S in the case of { [(m-1) α+1:m α] } determine, utilize the instantaneous channel state information or statistical channel status information obtained, calculate throughput of system or channel relevancy degree, maximize according to throughput of system or channel relevancy minimizes criterion, select the user terminal combination U that throughput of system maximizes or channel relevancy minimizes that sends as an envoy toopt；
(4) antenna for base station subset S is calculatedmThroughput of system, update index=index ∪ m, indic=indic index, S=S ∪ Sm, count=count+1；
(5) repeat (3) and (4), until indic=Φ, travel through all antenna for base station；
(6) maximize criterion according to throughput of system, select antenna for base station subset S during throughput of system maximummAnd user terminal combination Uopt。
By above step can the pattern of selection be B.2 time, optimum base station antenna subset and user side combine: { Sopt,Uopt}=argmax{Sm,Uopt}。
In actual extensive mimo system, base station is difficult to obtain accurate instantaneous channel state information, and the statistical property of channel is slow relative to instantaneous channel state information change, it is believed that base station can obtain more accurate statistical channel status information relatively easily.In the process described above, the process of the statistical channel status information that base station obtains is: feeds back to base station or base station after being added up the instantaneous channel state information in transmitting procedure by user terminal and adds up the instantaneous channel state information value of feedback in transmitting procedure, effectively reduce feedback overhead, reduce the complexity of extensive mimo system.
As shown in Figure 6: extensive mimo system includes precoding module 101, N bar radio frequency link, radio frequency link handover module 102, M base station antenna, K single-antenna user terminal, user terminal selecting module 103 and base station end Antenna Selection Module 104.User terminal selecting module 103 utilizes the instantaneous channel state information or statistical channel status information that base station obtains, and maximizes according to throughput of system or channel relevancy minimizes criterion, select optimized user terminal；Base station end Antenna Selection Module 104 utilizes the instantaneous channel state information or statistical channel status information that base station obtains, and maximizes criterion according to throughput of system and selects optimum base station antenna；Radio frequency link handover module 102 is according to the result of base station end Antenna Selection Module 104, radio frequency link is switched to optimum base station antenna, the antenna for base station being connected with radio frequency link is active, participate in the transmission of data, remaining untapped antenna for base station is closed, and is not involved in the transmission of data.
The above is only the preferred embodiment of the present invention; it is noted that, for those skilled in the art; under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (2)
1. the selection antenna for base station of extensive mimo system and user terminal method, it is characterised in that: comprise the following steps:
Step one, extensive mimo system is defined below selection pattern；Described selection pattern includes: A class, first uses
Family terminal selects, then the substep carrying out antenna for base station selection selects pattern；B class, user terminal selecting is selected with antenna for base station
Select the Combining Choice Model combined；Wherein A class includes: A.1 pattern: first carries out user terminal selecting, then carries out base
The substep that station antenna selects selects pattern to gradually form the selection pattern that number of antennas is successively decreased；A.2 pattern: first carry out user
Terminal selects, then the substep carrying out antenna for base station selection selects the selection pattern that pattern gradually forms and number of antennas is incremented by；
B class includes: B.1 pattern, and user terminal selecting selects Combining Choice Model and the number of antennas combined with antenna for base station
The selection pattern successively decreased；B.2 pattern, user terminal selecting selects Combining Choice Model and the sky combined with antenna for base station
The selection pattern that line number is incremented by；
Step 2, according to the pattern of selection, utilizes instantaneous channel state information or statistical channel status information that base station obtains,
Or channel relevancy degree throughput-maximized according to extensive mimo system minimizes criterion and selects user terminal, root
Antenna for base station is selected according to the throughput-maximized criterion of mimo system；Described channel relevancy degree is by with following formula 1 and formula 2
Determine:
When utilizing instantaneous channel state information, the degree of relevancy of user terminal k and user terminal j to the channel of base station is
When utilizing statistical channel status information, the degree of relevancy of user terminal k and user terminal j to the channel of base station is
CorrI<k, j>and CorrSThe numerical value of<k, j>is the least, and dependency is the least；Wherein, HkRepresent that user terminal k is to base
The channel vector stood,Represent user terminal k to the covariance matrix of BTS channel, k={1 ..., K},
||·||fNot Luo Beini this norm of crow of representing matrix, tr{ } representing matrix asks mark computing, and K is positive integer；
When the pattern of selection be A.1 time, antenna for base station selects to comprise the following steps with user terminal selecting:
(1) activate all antenna for base station, definition antenna for base station collection be combined into Ψ=1 ..., M}, wherein M is positive integer；
(2) all antenna for base station be involved in data transmission in the case of, utilize obtain instantaneous channel state information or
Person's statistical channel status information, calculates throughput of system or channel relevancy degree, maximize according to throughput of system or
Person's channel relevancy minimizes criterion, selects user's end that throughput of system maximizes or channel relevancy minimizes of sening as an envoy to
End combination Uopt；
(3) continuous print α base station antenna is closed successively；
(4) throughput of system of antenna for base station subset S of the antenna for base station of state of activation is calculated；
(5) repeat (3) and (4), travel through all antenna for base station；
(6) maximize criterion according to throughput of system, select antenna for base station subset S during throughput of system maximum；
When the pattern of selection be A.2 time, antenna for base station selects to comprise the following steps with user terminal selecting:
(1) activate all antenna for base station, in the case of all antenna for base station are involved in data transmission, utilize acquisition
Instantaneous channel state information or statistical channel status information, calculate throughput of system or channel relevancy degree, according to
Throughput of system maximizes or channel relevancy minimizes criterion, selects send as an envoy to throughput of system maximization or channel phase
The user terminal combination U that closing property minimizesopt；
(2) all antenna for base station are closed；
(3) continuous print α base station antenna is activated successively；
(4) antenna for base station subset S of the antenna for base station of state of activation is calculatedmThroughput of system；
(5) repeat (3) and (4), travel through all antenna for base station；
(6) maximize criterion according to throughput of system, select antenna for base station subset S during throughput of system maximumm；
When the pattern of selection be B.1 time, antenna for base station selects to comprise the following steps with user terminal selecting:
(1) all antenna for base station are activated；
(2) continuous print α base station antenna is closed successively；
(3) in antenna for base station subset S of antenna for base station of state of activationmIn the case of determining, utilize the instantaneous letter obtained
Channel state information or statistical channel status information, calculate throughput of system or channel relevancy degree, gulp down according to system
The amount of telling maximizes or channel relevancy minimizes criterion, the throughput of system that selects to send as an envoy to maximize or channel relevancy
The user terminal combination U of littleizationopt；
(4) antenna for base station subset S is calculatedmThroughput of system；
(5) repeat (3) and (4), travel through all antenna for base station；
(6) maximize criterion according to throughput of system, select antenna for base station subset S during throughput of system maximummWith
And user terminal combination Uopt；
When the pattern of selection be B.2 time, antenna for base station selects to comprise the following steps with user terminal selecting:
(1) all antenna for base station are closed；
(2) continuous print α base station antenna is activated successively；
(3) in antenna for base station subset S of antenna for base station of state of activationmIn the case of determining, utilize the instantaneous letter obtained
Channel state information or statistical channel status information, calculate throughput of system or channel relevancy degree, gulp down according to system
The amount of telling maximizes or channel relevancy minimizes criterion, the throughput of system that selects to send as an envoy to maximize or channel relevancy
The user terminal combination U of littleizationopt；
(4) antenna for base station subset S is calculatedmThroughput of system；
(5) repeat (3) and (4), travel through all antenna for base station；
(6) maximize criterion according to throughput of system, select antenna for base station subset S during throughput of system maximummWith
And user terminal combination Uopt；α is the positive integer within 1-5.
The selection antenna for base station of extensive mimo system the most according to claim 1 and user terminal method, it is special
Levy and be: the process of the statistical channel status information that base station obtains is: by user terminal to the instantaneous letter in transmitting procedure
Channel state information feeds back to base station or base station to the instantaneous channel state information value of feedback in transmitting procedure after adding up
Add up.
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| US10686498B2 (en) | 2015-03-31 | 2020-06-16 | Huawei Technologies Canada Co., Ltd. | Systems and methods for massive MIMO adaptation |
| CN109274412B (en) * | 2018-12-11 | 2021-07-02 | 中南大学 | Antenna selection method of large-scale MIMO system |
| CN114978249A (en) * | 2021-02-19 | 2022-08-30 | 中兴通讯股份有限公司 | User selection method, information transmission method, communication node, and storage medium |
| CN115843121A (en) * | 2021-09-18 | 2023-03-24 | 中兴通讯股份有限公司 | User scheduling method in multi-antenna signal transmission, electronic device and storage medium |
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| US7907972B2 (en) * | 2001-05-16 | 2011-03-15 | Qualcomm Incorporated | Method and apparatus for allocating downlink resources in a multiple-input multiple-output (MIMO) communication system |
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