CN107342802A - Random antenna system of selection, device and extensive mimo system - Google Patents
Random antenna system of selection, device and extensive mimo system Download PDFInfo
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- CN107342802A CN107342802A CN201710501879.1A CN201710501879A CN107342802A CN 107342802 A CN107342802 A CN 107342802A CN 201710501879 A CN201710501879 A CN 201710501879A CN 107342802 A CN107342802 A CN 107342802A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
- H04B7/0608—Antenna selection according to transmission parameters
- H04B7/061—Antenna selection according to transmission parameters using feedback from receiving side
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
Abstract
The present invention relates to random antenna system of selection, device and extensive mimo system, the channel condition information of mimo system is obtained by channel estimation, multigroup antenna set is randomly selected from all transmission antenna set, every group of antenna set is updated according to channel capacity maximum principle, multigroup antenna set after renewal is contrasted, using one group of maximum set of channel capacity as optimal antenna set.The present invention considers the channel condition information of system, antenna set is constantly updated using sequential iteration process, therefrom select the maximum antenna set of channel capacity, preferable systematic function is realized with low complex degree, is that extensive MIMO provides certain technical support in the standardization of 5G systems with practical.
Description
Technical field
The invention belongs to broadband wireless communication technique field, and in particular to random antenna system of selection, device with it is extensive
Mimo system.
Background technology
The key technology that extensive MIMO communicates as 5G, receive the extensive concern of domestic and foreign scholars.Extensive MIMO
By configuring tens or even hundreds of antennas in base station, spatial degrees of freedom is taken full advantage of, improves the frequency spectrum effect of communication system
Rate and message transmission rate.But as environmental problem caused by global warming is constantly aggravated, people are to green communications
Cry is also surging all the more.Although extensive MIMO can utilize a large amount of antennas to improve power system capacity, corresponding hardware cost
Also increase with signal transacting complexity with the increase of antenna.Therefore, finding one not only reduces cost but also can play big rule
The effective ways of mould mimo system advantage are most important.
Antenna Selection Technology, be according to certain criterion from transmitting several optimal antennas composition hairs are selected in reception antenna
She reception antenna subsets, make in antenna element number of packages of the rf chain way of transmitting terminal or receiving terminal less than configuration, and these are penetrated
Frequency link is adaptively transformed into transmitting or reception signal on antenna subset, can efficiently reduce system cost, improves big rule
The performance of mould mimo system.
Mimo system includes emitter, receiver, the radio frequency link configured respectively on transmitter and receiver, Yi Jixin
Number process chip, the transmitting terminal of emitter and the receiving terminal of receiver are mounted on antenna element, the configuration of traditional mimo system
Rf chain way be equal to antenna element number of packages, and use the mimo system of Antenna Selection Technology, the rf chain way that it is configured is small
In antenna element number of packages, the technology reduces the complexity and cost of mimo system.
The principle of existing random antenna system of selection is random in all transmission antennas to select desired antenna
Number, realize that step is as follows：
(1) channel condition information is obtained by channel estimation；
(2) row for selecting desired number random from channel matrix, it is alternatively that after channel matrix.
The advantages of this method is that computation complexity is extremely low, and shortcoming is not account for channel condition information, can cause performance
Decline.
Exhaust algorithm is the search for being possible to carry out limit in candidate subset in transmission antenna, is therefrom found out with most
The antenna subset of big power system capacity, this method can improve systematic function to greatest extent, but for the antenna with up to a hundred
Extensive mimo system, the calculating speed of this method are very slow.
The content of the invention
It is an object of the invention to provide a kind of random antenna system of selection, device and extensive mimo system, for solving
Certainly existing random antenna selection technique does not account for channel condition information, the problem of causing hydraulic performance decline.
In order to solve the above technical problems, the present invention proposes a kind of random antenna system of selection, comprise the following steps：
1) signal model of mimo system is established, the channel condition information of the MIMO systems is obtained by channel estimation；
2) S1 group antenna sets are randomly selected, S1 >=2, every group of antenna set are carried out more according to channel capacity maximum principle
Newly；The mode of every group of antenna set renewal includes updating each element in antenna set successively, and repeats the mode of this renewal
Until reach setting number S2, or the antenna set after renewal no longer changes；
3) the S1 group antenna sets after renewal are contrasted, using one group of maximum antenna set of channel capacity as optimal
Antenna set.
Further, the mode of every group of antenna set renewal specifically includes following steps：
A. will be needed in step 2) every group of antenna set updating as initial sets p=p (1), p (2) ..., p
(Q) Q element, each piece antenna of element representation }, are provided with initial sets p；
B. each element p (k) in initial sets p, wherein k=1 ..., Q are updated successively；By remaining unselected day
Line set and k-th element and each element of concentration replace k-th of element in initial sets p successively, and obtain new group
Into each antenna set corresponding to channel capacity, with wherein have maximum channel capacity antenna set update set p, so
After update next element, when whole Q elements renewal after the completion of, obtain newest antenna set；
C. using the newest antenna set as initial sets, repeat step B, until reach setting number S2, or
Antenna set after renewal no longer changes, and the antenna set now obtained is the antenna set of final updated.
In order to solve the above technical problems, the present invention also proposes a kind of random antenna system of selection, comprise the following steps：
(1) signal model of mimo system is established, the channel status that the MIMO systems are obtained by channel estimation is believed
Breath；
(2) one group of antenna set is randomly selected from all transmission antennas, according to channel capacity maximum principle to the group day
Line set is updated, and the mode of renewal includes updating each element in one group of antenna set successively, and repeats this more
New paragon until reach setting number S3 or renewal after antenna combination no longer change, using the antenna set after renewal as
First optimal antenna set；
(3) one group of antenna set is randomly selected again from all transmission antennas, to selecting again in the way of the renewal
The antenna set taken is updated, and the antenna set after renewal and the first optimal antenna set is contrasted, by channel
One group of maximum antenna set of capacity is as the second optimal antenna set；
(4) next optimal antenna set is selected again, and the number until randomly selecting antenna set reaches setting number S4
When, using current optimal antenna set as final optimal antenna set.
Further, the mode that every group of antenna set randomly selected is updated specifically includes following steps：
A. using the one group of antenna set randomly selected in step (2) as initial sets p=p (1), p (2) ..., p
(Q) Q element, each piece antenna of element representation }, are provided with initial sets p；
B. each element p (k) in initial sets p, wherein k=1 ..., Q are updated successively；By remaining unselected day
Line set and k-th element and each element of concentration replace k-th of element in initial sets p successively, and obtain new group
Into each antenna set corresponding to channel capacity, with wherein have maximum channel capacity antenna set update set p, so
After update next element, when whole Q elements renewal after the completion of, obtain newest antenna set；
C. using the newest antenna set as initial sets, repeat step B, until reach setting number S3, or
Antenna set after renewal no longer changes, and the antenna set now obtained is the antenna set after final updated.
In order to solve the above technical problems, the present invention also proposes a kind of extensive mimo system, including emitter, receiver,
The radio frequency link configured respectively on transmitter and receiver, and for selecting the processor of antenna set, the processor
For performing to give an order：
1) signal model of mimo system is established, the channel condition information of the MIMO systems is obtained by channel estimation；
2) S1 group antenna sets are randomly selected, S1 >=2, every group of antenna set are carried out more according to channel capacity maximum principle
Newly；The mode of every group of antenna set renewal includes updating each element in antenna set successively, and repeats the mode of this renewal
Until reach setting number S2, or the antenna set after renewal no longer changes；
3) the S1 group antenna sets after renewal are contrasted, using one group of maximum antenna set of channel capacity as optimal
Antenna set.
Further, the processor is additionally operable to perform to give an order：
A. will be needed in step 2) every group of antenna set updating as initial sets p=p (1), p (2) ..., p
(Q) Q element, each piece antenna of element representation }, are provided with initial sets p；
B. each element p (k) in initial sets p, wherein k=1 ..., Q are updated successively；By remaining unselected day
Line set and k-th element and each element of concentration replace k-th of element in initial sets p successively, and obtain new group
Into each antenna set corresponding to channel capacity, with wherein have maximum channel capacity antenna set update set p, so
After update next element, when whole Q elements renewal after the completion of, obtain newest antenna set；
C. using the newest antenna set as initial sets, repeat step B, until reach setting number S2, or
Antenna set after renewal no longer changes, and the antenna set now obtained is the antenna set of final updated.
In order to solve the above technical problems, the present invention also proposes a kind of extensive mimo system, including emitter, receiver,
The radio frequency link configured respectively on transmitter and receiver, and for selecting the processor of antenna set, the processor
For performing to give an order：
(1) signal model of mimo system is established, the channel status that the MIMO systems are obtained by channel estimation is believed
Breath；
(2) one group of antenna set is randomly selected from all transmission antennas, according to channel capacity maximum principle to the group day
Line set is updated, and the mode of renewal includes updating each element in one group of antenna set successively, and repeats this more
New paragon until reach setting number S3 or renewal after antenna combination no longer change, using the antenna set after renewal as
First optimal antenna set；
(3) one group of antenna set is randomly selected again from all transmission antennas, to selecting again in the way of the renewal
The antenna set taken is updated, and the antenna set after renewal and the first optimal antenna set is contrasted, by channel
One group of maximum antenna set of capacity is as the second optimal antenna set；
(4) next optimal antenna set is selected again, and the number until randomly selecting antenna set reaches setting number S4
When, using current optimal antenna set as final optimal antenna set.
Further, the processor is additionally operable to perform to give an order：
A. using the one group of antenna set randomly selected in step (2) as initial sets p=p (1), p (2) ..., p
(Q) Q element, each piece antenna of element representation }, are provided with initial sets p；
B. each element p (k) in initial sets p, wherein k=1 ..., Q are updated successively；By remaining unselected day
Line set and k-th element and each element of concentration replace k-th of element in initial sets p successively, and obtain new group
Into each antenna set corresponding to channel capacity, with wherein have maximum channel capacity antenna set update set p, so
After update next element, when whole Q elements renewal after the completion of, obtain newest antenna set；
C. using the newest antenna set as initial sets, repeat step B, until reach setting number S3, or
Antenna set after renewal no longer changes, and the antenna set now obtained is the antenna set after final updated.
In order to solve the above technical problems, the present invention also proposes a kind of antenna selection apparatus, including for selecting antenna set
Processor, the processor is used to perform to give an order：
1) signal model of mimo system is established, the channel condition information of the MIMO systems is obtained by channel estimation；
2) S1 group antenna sets are randomly selected, S1 >=2, every group of antenna set are carried out more according to channel capacity maximum principle
Newly；The mode of every group of antenna set renewal includes updating each element in antenna set successively, and repeats the mode of this renewal
Until reach setting number S2, or the antenna set after renewal no longer changes；
3) the S1 group antenna sets after renewal are contrasted, using one group of maximum antenna set of channel capacity as optimal
Antenna set.
Further, the processor is additionally operable to perform to give an order：
A. will be needed in step 2) every group of antenna set updating as initial sets p=p (1), p (2) ..., p
(Q) Q element, each piece antenna of element representation }, are provided with initial sets p；
B. each element p (k) in initial sets p, wherein k=1 ..., Q are updated successively；By remaining unselected day
Line set and k-th element and each element of concentration replace k-th of element in initial sets p successively, and obtain new group
Into each antenna set corresponding to channel capacity, with wherein have maximum channel capacity antenna set update set p, so
After update next element, when whole Q elements renewal after the completion of, obtain newest antenna set；
C. using the newest antenna set as initial sets, repeat step B, until reach setting number S2, or
Antenna set after renewal no longer changes, and the antenna set now obtained is the antenna set of final updated.
In order to solve the above technical problems, the present invention also proposes a kind of antenna selection apparatus, including for selecting antenna set
Processor, the processor is used to perform to give an order：
(1) signal model of mimo system is established, the channel status that the MIMO systems are obtained by channel estimation is believed
Breath；
(2) one group of antenna set is randomly selected from all transmission antennas, according to channel capacity maximum principle to the group day
Line set is updated, and the mode of renewal includes updating each element in one group of antenna set successively, and repeats this more
New paragon until reach setting number S3 or renewal after antenna combination no longer change, using the antenna set after renewal as
First optimal antenna set；
(3) one group of antenna set is randomly selected again from all transmission antennas, to selecting again in the way of the renewal
The antenna set taken is updated, and the antenna set after renewal and the first optimal antenna set is contrasted, by channel
One group of maximum antenna set of capacity is as the second optimal antenna set；
(4) next optimal antenna set is selected again, and the number until randomly selecting antenna set reaches setting number S4
When, using current optimal antenna set as final optimal antenna set.
Further, the processor is additionally operable to perform to give an order：
A. using the one group of antenna set randomly selected in step (2) as initial sets p=p (1), p (2) ..., p
(Q) Q element, each piece antenna of element representation }, are provided with initial sets p；
B. each element p (k) in initial sets p, wherein k=1 ..., Q are updated successively；By remaining unselected day
Line set and k-th element and each element of concentration replace k-th of element in initial sets p successively, and obtain new group
Into each antenna set corresponding to channel capacity, with wherein have maximum channel capacity antenna set update set p, so
After update next element, when whole Q elements renewal after the completion of, obtain newest antenna set；
C. using the newest antenna set as initial sets, repeat step B, until reach setting number S3, or
Antenna set after renewal no longer changes, and the antenna set now obtained is the antenna set after final updated.
The beneficial effects of the invention are as follows：
The signal model of extensive mimo system is established, the channel condition information of MIMO systems is obtained by channel estimation,
And S1 group antenna sets are randomly selected from all transmission antenna set, according to channel capacity maximum principle to every group of antenna set
It is updated, the S1 group antenna sets after renewal is contrasted, using one group of maximum set of channel capacity as optimal antenna
Set.The present invention considers the channel condition information of system, constantly updates antenna set using sequential iteration process, therefrom selects
The maximum antenna set of channel capacity, the systematic function realized with low complex degree, it is marks of the extensive MIMO in 5G systems
Standardization provides certain technical support with practical.
The signal model of extensive mimo system is established, the channel condition information of MIMO systems is obtained by channel estimation,
One group of antenna set is randomly selected from all transmission antenna set, this group of antenna set is entered according to channel capacity maximum principle
Row renewal, selects the first optimal antenna set, then chooses one group of antenna set again, and this group of antenna set is updated, will be updated
Antenna set afterwards is contrasted with the first optimal antenna set, selects the second optimal antenna set, then is selected next optimal
Antenna set, when reaching setting number, using current optimal antenna set as final optimal antenna set.The present invention
The channel condition information of mimo system is considered, antenna set is constantly updated using sequential iteration process, therefrom selects channel to hold
Measure maximum antenna set, the systematic function realized with low complex degree is extensive MIMO 5G systems standardization with
It is practical that certain technical support is provided.
Brief description of the drawings
Fig. 1 is extensive mimo system schematic diagram；
Fig. 2 is Receiving antenna selection system schematic；
Fig. 3 is flow chart of the method for the present invention；
Fig. 4 is channel capacity and the relation schematic diagram of signal to noise ratio.
Embodiment
The embodiment of the present invention is further described below in conjunction with the accompanying drawings.
Embodiment one：
The signal model of extensive mimo system is established, including transmitting terminal can obtain the channel status letter of receiving terminal feedback
Breath.All transmission antenna set are set to Γ={ 1 ..., M }, and S1 group antenna sets are randomly selected from all M roots transmission antennas
Close, S1 >=2, every group of antenna set there are Q root antennas, according to channel capacity maximum principle, in accordance with the following methods to every group of antenna set
Conjunction is updated：
Using randomly select first group of antenna set as the first initial sets, the first initial sets of setting are p1={ p1
(1), p1 (2) ..., p1 (Q) }, updating each element p (k) (k=1 ..., Q), update mode in initial sets p1 successively is：
Assuming that k-th of element in renewal p1, then by the union of k-th of element in remaining unselected antenna set and p1 { Γ p1 }
Element in ∪ p1 (k) is obtained corresponding to each antenna set newly formed successively as k-th of element in set p1
Channel capacity, the antenna set for wherein having maximum channel capacity is updated to new initial sets p1.When by whole Q elements
After the completion of renewal, antenna set p1 renewals finish.Wherein, represent collection exclude.Using the antenna set p1 updated as initial set
Close, repeat said process, until stopping when reaching the number S2 or the identical adjacent antenna set that updates twice of setting, now
Obtained set is the antenna set after first group of antenna set renewal.
Using second group of antenna set of selection as the second initial sets, the second initial sets of setting be p2=p2 (1),
P2 (2) ..., p2 (Q) }, updating each element p2 (k) (k=1 ..., Q), update mode in initial sets p2 successively is：It is false
If k-th of element in renewal p2, then by the union of k-th of element in remaining unselected antenna set and p2 { Γ p2 } ∪
Element in p2 (k) obtains the letter corresponding to each antenna set newly formed successively as k-th of element in set p2
Road capacity, the antenna set for wherein having maximum channel capacity is updated to new initial sets p2.When by whole Q elements more
After the completion of new, newest set p2 is generated.Wherein, represent collection exclude.Using the antenna set p2 updated as initial sets,
Said process is repeated, until stopping when reaching the number S2 or the adjacent p2 that obtains twice identical of setting, the collection now obtained
It is the antenna set after second group of antenna set renewal to close p2.
Antenna set after S1 groups are updated is contrasted, and optimal antenna collection is elected in the set with maximum channel capacity as
Close.
The method that above-mentioned antenna selecting method updates antenna set using the parallel computation of S1 group antenna sets, calculate speed
Degree is fast, obtains the result efficiency high of optimal antenna set, but the requirement to hardware is also higher, in order to save hardware cost,
The method that serial computing renewal antenna set can be used, this method comprise the following steps：
One group of antenna set is randomly selected from all transmission antenna set, according to channel capacity maximum principle to the group day
Line set is updated, and the mode of renewal is：
A. all transmission antenna set are set to Γ={ 1 ..., M }, and the antenna set that one group is randomly selected is as initial
Set p={ p (1), p (2) ..., p (Q) }, wherein Q are required antenna number (Q<M).
B. updating each element p (k) (k=1 ..., Q), update mode in initial sets p successively is：Assuming that the in renewal p
K element, then by the element in the union of k-th of element in remaining unselected antenna set and p { Γ p } ∪ p (k) according to
K-th of element in the secondary p as set, and the channel capacity corresponding to each antenna set newly formed is obtained, will wherein have
The antenna set for having maximum channel capacity is updated to new initial sets p.Completed when said process updates whole Q elements
Afterwards, newest set p is generated；Above-mentioned and Ji Zhong represents that collection excludes.
C. newly as initial sets, repeat step B, number S3 or phase will be set until reaching by caused antenna set p
The identical stoppings of set p that neighbour generates twice, the set p now obtained are the antenna set after initial sets renewal, will be updated
Antenna set afterwards is as the first optimal antenna set.
One group of antenna set is randomly selected again from all transmission antenna set, to selecting again in the way of above-mentioned renewal
The antenna set taken is updated, and the antenna set after renewal and the first optimal antenna set is contrasted, by channel capacity
One group of maximum antenna set is as the second optimal antenna set.
Next optimal antenna set is selected again, will when the number until randomly selecting antenna set reaches setting number S4
Current optimal antenna set is as final optimal antenna set.
The present invention considers the channel condition information of antenna, constantly updates antenna set using sequential iteration process, therefrom
The maximum antenna set of channel capacity is selected, the systematic function realized with low complex degree is extensive MIMO in 5G systems
Standardization and practical provide certain technical support.
The invention also provides a kind of antenna selection apparatus, including for selecting the processor of antenna set, processor is used
In performing to give an order：
1) signal model of extensive mimo system is established, the channel shape of the mimo system is obtained by channel estimation
State information；
2) S1 group antenna sets are randomly selected, S1 >=2, every group of antenna set are carried out more according to channel capacity maximum principle
Newly；The mode of every group of antenna set renewal includes updating each element in antenna set successively, and repeats the mode of this renewal
Until reach setting number S2, or the antenna set after renewal no longer changes；
3) the S1 group antenna sets after renewal are contrasted, using one group of maximum antenna set of channel capacity as optimal
Antenna set.
The present invention also proposes another antenna selection apparatus, including for selecting the processor of antenna set, processor is used
In performing to give an order：
(1) signal model of extensive mimo system is established, the channel shape of the mimo system is obtained by channel estimation
State information；
(2) one group of antenna set is randomly selected from all transmission antennas, according to channel capacity maximum principle to the group day
Line set is updated, and the mode of renewal includes updating each element in one group of antenna set successively, and repeats this more
New paragon until reach setting number S3 or renewal after antenna combination no longer change, using the antenna set after renewal as
First optimal antenna set；
(3) one group of antenna set is randomly selected again from all transmission antennas, to selecting again in the way of the renewal
The antenna set taken is updated, and the antenna set after renewal and the first optimal antenna set is contrasted, by channel
One group of maximum antenna set of capacity is as the second optimal antenna set；
(4) next optimal antenna set is selected again, and the number until randomly selecting antenna set reaches setting number S4
When, using current optimal antenna set as final optimal antenna set.
The processor of two kinds of antenna selection apparatus of the proposition of the present invention, the instruction of execution correspond to above two day respectively
Line selection selection method, due to the introduction to above two antenna selecting method, sufficiently clear is complete, therefore no longer processor is held
Capable instruction is described in detail.
Embodiment two：
Extensive mimo system as shown in Figure 1, including emitter, receiver, match somebody with somebody on transmitter and receiver respectively
The radio frequency link put, and for selecting the processor of antenna set (being not drawn into figure), wherein, radio frequency link includes low frequency
Noise amplifier, link switch, analog-digital converter etc..The operation principle of mimo system is：Emitter utilizes anti-from receiver
The channel condition information that feedback comes, carried out according to the antenna of a certain performance indications selected section superior performance from all transmission antennas
Send.Part parallel data flow is sent simultaneously to Multi-Input-Multi-Output Fading Channel, and the data flow after decline, which reaches, receives day
Line, radio frequency link converter selected section antenna from all reception antennas are received, and data are flowed through at several radio frequency links
After reason, decoded, the data so sent are resumed out.
Above-mentioned processor is used to perform following steps：
Assuming that shown in Fig. 1 be one outfit M root transmitting antennas, the point-to-point extensive mimo system of N root reception antennas,
Wherein transmitting terminal has Q radio frequency link Q<M.Assuming that carrying out day line options in transmitting terminal, receiving terminal is used to connect using whole antennas
The collection of letters number.Emitter can obtain channel condition information by the feedback of receiver, and the power distribution of all selection antennas is
Uniformly.From M root transmitting antennas select Q root optimal antennas communicated, then respective channel capacity can using mathematical notation as：
In formula, ρ represents total transmitting signal to noise ratio, INRepresent N × N unit matrix, HaltRepresent N × Q selection antenna sets
Into channel matrix,Representing matrix HaltConjugate transposition, det () represent seek determinant of a matrix.
The present invention carries out day line options using random antenna selection algorithm, and the algorithm includes interior circulation and outer circulation two
Point：
Outer circulation：In each outer circulation, an antenna set is generated at random, and the antenna set is arranged to p={ p (1), p
(2) ..., p (Q) }, its corresponding optimization antenna set is then obtained by interior loop optimization, S1 is obtained by S1 outer circulation
Individual antenna set, therefrom selection have the antenna set of maximum channel capacity selection result the most final.
Interior circulation：In interior circulation every time, each member in initial sets p is updated successively according to channel capacity maximum principle
Element, concretely comprise the following steps：
(1) first element in set p is updated：By remaining antenna set { 1,2 ..., M } each element in p replace successively
First element changed in p, and the channel capacity corresponding to replacement aft antenna set every time is obtained, therefrom find out with maximum letter
The antenna set of road capacity merges to be contrasted with initial sets p, using the antenna set p1 of wherein larger channel capacity as renewal second
The initial sets of individual element.
(2) second element in p1 is updated：By remaining antenna set { 1,2 ..., M } each element in p1 replace successively
Second element in p1, and the channel capacity corresponding to replacement aft antenna set every time is obtained, therefrom find out with maximum letter
The antenna set of road capacity contrasts with set p1 channel capacity, using the antenna set p2 of wherein larger channel capacity as more
The initial sets of new 3rd element.
(3) by that analogy, Q element has all been updated, has obtained newest antenna set pQ, then this time inner cyclic process is complete
Finish.
Initial sets using above-mentioned gained antenna set pQ as interior circulation next time, continuous repeat step (1)-step
(3), until reach antenna set in setting obtained by cycle-index S2 or adjacent circulation interior twice it is identical when, terminate in follow
Ring process.
With reference to lifting of the analysis of simulation experiment present invention to traditional random antenna method performance, emulate soft in matlab
Carried out under part environment, emulation major parameter is shown in Table 1.
Table 1
| Major parameter | Numerical value |
| Transmission antenna number M | 128 |
| Reception antenna number N | 4 |
| Transmitting terminal rf chain way Q | 1~30 |
| Channel | Flat fading channel |
Be not difficult to find out by Fig. 4, channel capacity performance of the invention apparently higher than traditional random antenna system of selection, and
It is essentially the same with the performance of exhaustive method.Meanwhile as the increase of selection antenna number, advantage of the invention are also obvious all the more.
The antenna of number, does not account for channel status needed for traditional random antenna system of selection only randomly chooses
Information, the present invention compensate for the deficiency of traditional random antenna system of selection, it is contemplated that the channel condition information of system, utilize order
Iterative process constantly updates antenna set, therefrom selects the maximum antenna set of channel capacity, substantially increases the performance of system,
The performance close to exhaust algorithm is realized, and much smaller than the computation complexity of the method for exhaustion.
The invention also provides another mimo system, including emitter, receiver, respectively on transmitter and receiver
The radio frequency link of configuration, and for selecting the processor of antenna set, processor is used to perform to give an order：
The signal model of mimo system is established, the channel condition information in the mimo system is obtained by channel estimation.
One group of antenna set is randomly selected from all transmission antennas, according to channel capacity maximum principle to this group of antenna set
Conjunction is updated, and the mode of renewal includes each element in renewal set successively, and repeats this update mode and set until reaching
Determine to stop when number S3 or identical adjacent set caused twice, using the antenna set after renewal as the first optimal antenna collection
Close.
Randomly select one group of antenna set, the antenna in the way of renewal to choosing again again from all transmission antennas
Set is updated, and the antenna set after renewal and the first optimal antenna set are contrasted, by the one of channel capacity maximum
Group antenna set is as the second optimal antenna set.
Next optimal antenna set is selected again, when the number until randomly selecting antenna set reaches setting number S4,
Using current optimal antenna set as final optimal antenna set.
The difference of two mimo systems of the present invention is, the antenna selection instruction of the processor operation of mimo system
Difference, a kind of method that antenna set is updated using parallel computation, calculating speed is fast, effect is high, and another kind uses serial computing
The method of antenna set is updated, calculating speed is relatively slow, but less demanding to processor hardware.
Because the instruction that the processor of above-mentioned mimo system uses is corresponding with the method for serial computing renewal antenna set, because
No longer the instruction of computing device is described in detail for this.
Extensive mimo system proposed by the present invention utilizes the maximum antenna set of the method search channel capacity of sequential iteration
Close, using channel capacity as evaluation index, computation complexity is well below exhaustive method, but performance is very close to exhaustive method.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for those skilled in the art
For member, the present invention can have various modifications and variations.Any modification within the spirit and principles of the invention, being made,
Equivalent substitution, improvement etc., should be included within scope of the presently claimed invention.
Claims (10)
1. a kind of random antenna system of selection, it is characterised in that comprise the following steps：
1) signal model of mimo system is established, the channel condition information of the mimo system is obtained by channel estimation；
2) S1 group antenna sets are randomly selected, S1 >=2, every group of antenna set are updated according to channel capacity maximum principle；
The mode of every group of antenna set renewal includes updating each element in antenna set successively, and repeat the mode of this renewal until
Reach the antenna set after setting number S2, or renewal no longer to change；
3) the S1 group antenna sets after renewal are contrasted, using one group of maximum antenna set of channel capacity as optimal antenna
Set.
2. random antenna system of selection according to claim 1, it is characterised in that the side of every group of antenna set renewal
Formula specifically includes following steps：
A. every group of antenna set updating will be needed in step 2) as initial sets p={ p (1), p (2) ..., p (Q) }, just
Initial set closes in p and is provided with Q element, each piece antenna of element representation；
B. each element p (k) in initial sets p, wherein k=1 ..., Q are updated successively；By remaining unselected antenna set
Close and k-th element and each element of concentration replace k-th of element in initial sets p successively, and obtain what is newly formed
Channel capacity corresponding to each antenna set, update set p, Ran Hougeng with the antenna set wherein with maximum channel capacity
New next element, after the completion of the renewal of whole Q elements, obtain newest antenna set；
C. using the newest antenna set as initial sets, repeat step B, until reach setting number S2, or renewal
Antenna set afterwards no longer changes, and the antenna set now obtained is the antenna set of final updated.
3. a kind of random antenna system of selection, it is characterised in that comprise the following steps：
(1) signal model of mimo system is established, the channel condition information of the mimo system is obtained by channel estimation；
(2) one group of antenna set is randomly selected from all transmission antennas, according to channel capacity maximum principle to this group of antenna set
Conjunction is updated, and the mode of renewal includes updating each element in one group of antenna set successively, and repeats this renewal side
Formula until reach setting number S3 or renewal after antenna combination no longer change, using the antenna set after renewal as first most
Excellent antenna set；
(3) one group of antenna set is randomly selected again from all transmission antennas, to choosing again in the way of the renewal
Antenna set is updated, and the antenna set after renewal and the first optimal antenna set is contrasted, by channel capacity
One group of maximum antenna set is as the second optimal antenna set；
(4) next optimal antenna set is selected again, will when the number until randomly selecting antenna set reaches setting number S4
Current optimal antenna set is as final optimal antenna set.
4. random antenna system of selection according to claim 3, it is characterised in that every group of antenna set randomly selected enters
The mode of row renewal specifically includes following steps：
A. using the one group of antenna set randomly selected in step (2) as initial sets p={ p (1), p (2) ..., p (Q) }, just
Initial set closes in p and is provided with Q element, each piece antenna of element representation；
B. each element p (k) in initial sets p, wherein k=1 ..., Q are updated successively；By remaining unselected antenna set
Close and k-th element and each element of concentration replace k-th of element in initial sets p successively, and obtain what is newly formed
Channel capacity corresponding to each antenna set, update set p, Ran Hougeng with the antenna set wherein with maximum channel capacity
New next element, after the completion of the renewal of whole Q elements, obtain newest antenna set；
C. using the newest antenna set as initial sets, repeat step B, until reach setting number S3, or renewal
Antenna set afterwards no longer changes, and the antenna set now obtained is the antenna set after final updated.
5. a kind of mimo system, including emitter, receiver, the radio frequency link configured respectively on transmitter and receiver, with
And for selecting the processor of antenna set, it is characterised in that the processor is used to perform to give an order：
1) signal model of mimo system is established, the channel condition information of the mimo system is obtained by channel estimation；
2) S1 group antenna sets are randomly selected, S1 >=2, every group of antenna set are updated according to channel capacity maximum principle；
The mode of every group of antenna set renewal includes updating each element in antenna set successively, and repeat the mode of this renewal until
Reach the antenna set after setting number S2, or renewal no longer to change；
3) the S1 group antenna sets after renewal are contrasted, using one group of maximum antenna set of channel capacity as optimal antenna
Set.
6. a kind of mimo system, including emitter, receiver, the radio frequency link configured respectively on transmitter and receiver, with
And for selecting the processor of antenna set, it is characterised in that the processor is used to perform to give an order：
(1) signal model of mimo system is established, the channel condition information of the mimo system is obtained by channel estimation；
(2) one group of antenna set is randomly selected from all transmission antennas, according to channel capacity maximum principle to this group of antenna set
Conjunction is updated, and the mode of renewal includes updating each element in one group of antenna set successively, and repeats this renewal side
Formula until reach setting number S3 or renewal after antenna combination no longer change, using the antenna set after renewal as first most
Excellent antenna set；
(3) one group of antenna set is randomly selected again from all transmission antennas, to choosing again in the way of the renewal
Antenna set is updated, and the antenna set after renewal and the first optimal antenna set is contrasted, by channel capacity
One group of maximum antenna set is as the second optimal antenna set；
(4) next optimal antenna set is selected again, will when the number until randomly selecting antenna set reaches setting number S4
Current optimal antenna set is as final optimal antenna set.
7. a kind of antenna selection apparatus, including for selecting the processor of antenna set, it is characterised in that the processor is used for
Perform to give an order：
1) signal model of mimo system is established, the channel condition information of the mimo system is obtained by channel estimation；
2) S1 group antenna sets are randomly selected, S1 >=2, every group of antenna set are updated according to channel capacity maximum principle；
The mode of every group of antenna set renewal includes updating each element in antenna set successively, and repeat the mode of this renewal until
Reach the antenna set after setting number S2, or renewal no longer to change；
3) the S1 group antenna sets after renewal are contrasted, using one group of maximum antenna set of channel capacity as optimal antenna
Set.
8. antenna selection apparatus according to claim 7, it is characterised in that the processor is additionally operable to perform following finger
Order：
A. every group of antenna set updating will be needed in step 2) as initial sets p={ p (1), p (2) ..., p (Q) }, just
Initial set closes in p and is provided with Q element, each piece antenna of element representation；
B. each element p (k) in initial sets p, wherein k=1 ..., Q are updated successively；By remaining unselected antenna set
Close and k-th element and each element of concentration replace k-th of element in initial sets p successively, and obtain what is newly formed
Channel capacity corresponding to each antenna set, update set p, Ran Hougeng with the antenna set wherein with maximum channel capacity
New next element, after the completion of the renewal of whole Q elements, obtain newest antenna set；
C. using the newest antenna set as initial sets, repeat step B, until reach setting number S2, or renewal
Antenna set afterwards no longer changes, and the antenna set now obtained is the antenna set of final updated.
9. a kind of antenna selection apparatus, including for selecting the processor of antenna set, it is characterised in that the processor is used for
Perform to give an order：
(1) signal model of mimo system is established, the channel condition information of the mimo system is obtained by channel estimation；
(2) one group of antenna set is randomly selected from all transmission antennas, according to channel capacity maximum principle to this group of antenna set
Conjunction is updated, and the mode of renewal includes updating each element in one group of antenna set successively, and repeats this renewal side
Formula until reach setting number S3 or renewal after antenna combination no longer change, using the antenna set after renewal as first most
Excellent antenna set；
(3) one group of antenna set is randomly selected again from all transmission antennas, to choosing again in the way of the renewal
Antenna set is updated, and the antenna set after renewal and the first optimal antenna set is contrasted, by channel capacity
One group of maximum antenna set is as the second optimal antenna set；
(4) next optimal antenna set is selected again, will when the number until randomly selecting antenna set reaches setting number S4
Current optimal antenna set is as final optimal antenna set.
10. antenna selection apparatus according to claim 9, it is characterised in that the processor is additionally operable to perform following finger
Order：
A. using the one group of antenna set randomly selected in step (2) as initial sets p={ p (1), p (2) ..., p (Q) }, just
Initial set closes in p and is provided with Q element, each piece antenna of element representation；
B. each element p (k) in initial sets p, wherein k=1 ..., Q are updated successively；By remaining unselected antenna set
Close and k-th element and each element of concentration replace k-th of element in initial sets p successively, and obtain what is newly formed
Channel capacity corresponding to each antenna set, update set p, Ran Hougeng with the antenna set wherein with maximum channel capacity
New next element, after the completion of the renewal of whole Q elements, obtain newest antenna set；
C. using the newest antenna set as initial sets, repeat step B, until reach setting number S3, or renewal
Antenna set afterwards no longer changes, and the antenna set now obtained is the antenna set after final updated.
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