CN107566020A - A kind of marine site descending multi-user mixing method for precoding and equipment - Google Patents
A kind of marine site descending multi-user mixing method for precoding and equipment Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The present invention provides a kind of marine site descending multi-user mixing method for precoding and equipment, for solving the distant of some user and bank base station, it is difficult to estimate the channel Small-scale fading of these users, and the problem of communication quality can not be ensured.One of which marine site descending multi-user mixing method for precoding, including step：Calculate one by oneObtaining digital precode matrix isWherein,It is descending power vector,It is multiple unit vector.The present invention ensures the fairness between downlink user using precoding of starting, so that the speed of all downlink users can be higher than some normal line, realizes the broadband covering of descending multi-user.
Description
Technical field
The present invention relates to the communication technology, and in particular to a kind of marine site descending multi-user mixing method for precoding and equipment.
Background technology
China marine site wide scope, mainland coastline is long, and marine economy is very active.To meet pleasure-boat, merchant ship, fishing
The application demands such as ship, maritime patrol ship, ensure offshore sea waters navigation safety, and lifting relates to extra large personnel's quality of life, promotes marine economy to enter
One step develops, it would be highly desirable to develops marine site broadband communications technologies.Existing LTE network main surface landwards covers, and stresses solve city, suburb
The communication issue in area, technically rely on very much a wide range of intensive cloth station.It is difficult to build base station, therefore, marine site broadband connections on sea
The base station of network littoral can only be built, and so, network topology critical constraints, systematic function is difficult to ensure that.
Development marine site broadband connections can not start from scratch again, and a kind of feasible technological approaches is the current ground communication of transformation
LTE technologies., can be by the way that there is extensive antenna array in Coast deployment in order to adapt to the channel characteristics of offshore sea waters and user distribution
The overhead base station (bank base station) of row, multi-user multi-antenna (Multi-User MIMO) system is formed with marine user, so as to improve
Traffic rate and service quality.But under base station site constraint, LTE network limited coverage area, and because overhead base station is selected
Location is limited to geographical conditions, and classical LTE network is difficult to the broadband covering that continues along the coastline, under the covering of arrowband universe, allowed
Each bank base station covers a piece of marine site, and it is a kind of solution route to form a wide-band-message port.Boat enters cyber port, and in bank
Access network network, enjoyment broadband service in the coverage of base station；Other times, user can enjoy narrow band communication service, meet
Basic safe navigation demand.
There is a great difference in terms of channel estimation with GCS Ground Communication System for communication system in the marine site of above- mentioned information port.
In the communication system of this form, some user is distant with bank base station, it is difficult to the channel to these users
Small-scale fading is estimated, can not ensure communication quality.
The content of the invention
In view of the above problems, the present invention proposes the one kind for overcoming above mentioned problem or solving the above problems at least in part
Marine site descending multi-user mixing method for precoding and equipment.
For this purpose, in a first aspect, the present invention proposes a kind of marine site descending multi-user mixing method for precoding, its feature exists
In, including step：
Calculate one by oneObtaining digital precode matrix is
Wherein,It is descending power vector,It is multiple unit vector；
Calculated by following manner：
To simulate pre-coding matrix, K is number of users, channel vector table corresponding to k-th of user
It is up to formula
WhereinThe phase deviation vector of originator antenna is represented,
It is a part for channel large scale effect；dkRepresent k-th of user to the distance of base station；β is energy decay estimation；
αl,kThe Small-scale fading of channel is represented, in the communication system of marine site, due to fading channel αl,kConcrete numerical value be difficult estimation, but
It is that assume that it is the stochastic variable of obedience standard multiple Gauss distribution, and the α of different footmarksl,kBetween independently of each other.Definition the
The equivalent channel matrix A of k userkFor
IfOrderConstruct two matrix Ds and Ω；
Construction vectorFor noise vector,It is vectorial for K dimensions complete 1,It is the user power of equivalent up channel；H represents conjugate transposition symbol.
Digital precode matrix F is solved using following alternative mannerBB, wherein the variable x x in the n-th step iteration(n)Represent,
ε1、ε2For cut-off threshold, pt、qtFor temporary variable：
WhenOrWhen
Calculate
Descending power is updated, and is normalized：
Calculate
Ascending power is updated, and is normalized：
To i=1:K
Structural matrix The optimal beam forming of i-th of user of so the n-th step
VectorIt isWithGeneralized eigenvector corresponding to maximum generalized characteristic value
End loop；
D is updated according to definition(n)、Ω(n)；
Exit circulation.
Here it is I assume that allAll equal, concrete numerical value is actually the watt level of noise.Such as in this Shen
In an emulation embodiment please,Value -106dBm.
Optionally, calculating simulation pre-coding matrix FRFThe step of include：
If FtIt is the phase deviation vector by being all likely to occurThe matrix of composition, then have
FRFEach row all from FtTaken in matrix, and FRFKth row be FtIn makeMaximumI.e.
To k=1:K
Make i=argmaxdiag (Ft HAkFt)
Take
End loop.
Second aspect, the present invention provide a kind of computer-readable recording medium, are stored thereon with computer program, the program
The step of as above any methods described is realized when being executed by processor.
The third aspect, the present invention provide a kind of computer equipment, including memory, processor and are stored in the storage
On device and the computer program that can perform on the processor, it is characterised in that real during the computing device described program
Now as above any methods described the step of.
As shown from the above technical solution, the present invention proposes that a kind of descending multi-user mixing based on maximin criterion prelists
Code scheme, suitable for the application scenarios of multi-user multi-antenna marine site communication system, the purpose is in the small dimensional information of channel not
Under the precondition known, ensure the fairness between downlink user using precoding of starting, so that the speed of all downlink users
Some normal line can be higher than, realize the broadband covering of descending multi-user.
Above it is to provide the simplified summary of the understanding to some aspects of the present invention.This part neither the present invention and
The detailed statement of its various embodiment is nor the statement of exhaustion.It is both not used in identification the present invention important or key feature or
Do not limit the scope of the present invention, but the selected principle of the present invention provided with a kind of reduced form, as to it is given below more
The brief introduction specifically described.It should be appreciated that either alone or in combination using one for being set forth above or being detailed below or
Multiple features, other embodiments of the invention are also possible.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is to perform steps flow chart schematic diagram in one embodiment of the present of invention.
Embodiment
The present invention is described below in conjunction with exemplary communication system.
The present invention proposes a kind of descending multi-user mixing pre-coding scheme based on maximin criterion, suitable for multi-user
In the application scenarios of multiple antennas marine site communication system, the purpose is under the unknown precondition of the small dimensional information of channel, utilize
Precoding of starting ensures the fairness between downlink user, so that the speed of all downlink users can be higher than some standard
Line, realize the broadband covering of descending multi-user.
In the marine site communication system of one embodiment of the present of invention, number of users K=6, antenna number M=128, multipath channel
Footpath number L=3, it is assumed that the noise power of all users is -106dBm.In relatively performance, the variable of curvilinear abscissa is
Originator power P, becomes from 0dBm and turns to 50dBm, and a point is imitated every 5dBm on curve；The variable of ordinate is user's minimum speed limit
R, computational methods are, here using the SINR newly defined in this programme.In simulation process, first in the range of 1km to 100km
6 customer locations of generation at random, every footpath of each user is according to random generation angle is evenly distributed in section, so as to generate
Simulated channel.
In traditional pre-coding scheme, because channel information is completely known, the SINR of k-th of user is typically written asBut when known to channel information part,It is a random vector, therefore this hair
Bright SINR cannot be calculated with above formula.So now need to weigh SINR in the angle of statistical average, then use
Family k SINR can be write as
Above formula can be expressed as after abbreviationWherein AkExpression formula be
In one embodiment of the present of invention, a kind of marine site descending multi-user mixing method for precoding, including step：Calculate mould
Intend pre-coding matrix FRFWith calculating digital precode matrix FBB。
Calculating simulation pre-coding matrix FRFThe step of include：
If FtIt is the phase deviation vector by being all likely to occurThe matrix of composition, then have
FRFEach row all from FtTaken in matrix, and FRFKth row be FtIn makeMaximumI.e.
To k=1:K
Make i=argmaxdiag (Ft HAkFt)
Take
End loop.
The step of calculating digital precode matrix includes：
Calculate one by oneObtaining digital precode matrix is
Wherein,It is descending power vector,It is multiple unit vector；
Calculated by following manner：
To simulate pre-coding matrix, K is number of users, ifOrderConstruct two matrix Ds and Ω；
Construction vectorFor noise vector,It is vectorial for K dimensions complete 1,
It is the user power of equivalent up channel；
Digital precode matrix F is solved using following alternative mannerBB, wherein the variable x x in the n-th step iteration(n)Represent,
ε1、ε2For cut-off threshold：
WhenOrWhen
Calculate
Descending power is updated, and is normalized：
Calculate
Ascending power is updated, and is normalized：
To i=1:K
Structural matrix The optimal beam forming of i-th of user of so the n-th step
VectorIt isWithGeneralized eigenvector corresponding to maximum generalized characteristic value
End loop；
D is updated according to definition(n)、Ω(n)；
Exit circulation.
Emulation experiment is carried out for traditional pure digi-tal precoding and mixing pre-coding scheme, because channel multipath fading is joined
Number αl,kUnknown, the channel vector of each user can be expressed asTradition side in emulation experiment
Method is based on this channel and generates traditional pre-coding matrix.It can see by emulation, when known to channel information part, not
Under the conditions of same transmit power, the solution of the present invention can obtain very high gain compared to traditional pre-coding scheme.
The present invention considers the characteristics of marine site channel large scale decline is readily estimated, multipath fading information is not easy to estimate,
New Signal to Interference plus Noise Ratio expression formula is defined, the mixing pre-coding scheme based on maximin criterion is devised, makes user's lowest speed
Rate is significantly lifted under the conditions of known to channel information part compared to traditional method for precoding, realizes system
Broadband covers.
The present invention provides a kind of computer-readable recording medium, is stored thereon with computer program, the program is by processor
The step of as above any methods described is realized during execution.
The present invention provides a kind of computer equipment, including memory, processor and is stored on the memory and can
The computer program performed on the processor, it is characterised in that realize during the computing device described program and such as take up an official post
The step of one methods described.
" monitoring " used herein includes any kind of function relevant with being observed, recording or being detected with instrument,
These instruments do not have any influence to monitored element or the operation of element group or state.
" at least one " used herein, " one or more " and "and/or" are open statements, when in use
It can be united and separate.For example, " at least one in A, B and C ", " at least one in A, B or C ", " in A, B and C
One or more " and " one or more of A, B or C " refer to only A, only B, only C, A and B together, A and C together,
B and C together or A, B and C together.
"one" entity of term refers to one or more entities.Thus term "one", " one or more " and " extremely
It is few one " it is herein defined as what is be interchangeable.It should also be noted that term " comprising ", "comprising" and " having " and can be mutual
Change what is used.
Term " automatic " used herein and its modification refer to not have when performing processing or operation tangible artificial
Any processing or operation completed in the case of input.However, the execution place is used when processing or operation is performed
The substantive or immaterial artificial input received before reason or operation, the processing or operation can also be automatic.If
Input influences how the processing or operation will be carried out, then is substantive depending on the artificial input.The processing or operation are not influenceed
The artificial input carried out is not to be taken as substantive.
Term " computer-readable medium " used herein refers to participate in providing instructions to any of computing device
Tangible storage device and/or transmission medium.Computer-readable medium can be in network transmission (such as SOAP) on ip networks
The serial command collection of coding.Such medium can take many forms, and including but not limited to non-volatile media, volatibility is situated between
Matter and transmission medium.Non-volatile media includes such as NVRAM or magnetically or optically disk.Volatile media includes such as main storage
Dynamic memory (such as RAM).The common form of computer-readable medium includes such as floppy disk, flexible disk, hard disk, tape or appointed
What its magnetizing mediums, magnet-optical medium, CD-ROM, any other optical medium, punched card, paper tape, any other there is hole shape pattern
Physical medium, RAM, PROM, EPROM, FLASH-EPROM, the solid state medium of such as storage card, any other storage chip or
Any other medium that cassette, the carrier wave described below or computer can be read.The digital file attachment of Email or
Other self-contained news files or archive set are considered as the distribution medium equivalent to tangible media.Work as computer-readable medium
When being configured as database, it should be appreciated that the database can be any kind of database, such as relational database, number of levels
According to storehouse, OODB Object Oriented Data Base etc..Correspondingly, it is believed that the present invention includes tangible media or distribution medium and existing skill
Equivalent known to art and the medium of following exploitation, the software implementation of the present invention is stored in these media.
Term used herein " it is determined that ", " computing " and " calculating " and its modification be interchangeable, and including appointing
Method, processing, mathematical operation or the technology of what type.More specifically, the explanation that such term can include such as BPEL is advised
Then or rule language, wherein logic be not hard coded but in the rule file that can be read, explain, compiled and performed table
Show.
Although the various embodiments described above are described, those skilled in the art once know basic wound
The property made concept, then other change and modification can be made to these embodiments, so embodiments of the invention are the foregoing is only,
Not thereby the scope of patent protection of the present invention, every equivalent structure made using description of the invention and accompanying drawing content are limited
Or equivalent flow conversion, or other related technical areas are directly or indirectly used in, similarly it is included in the patent of the present invention
Within protection domain.
Claims (4)
1. a kind of marine site descending multi-user mixing method for precoding, it is characterised in that including step：
Calculate one by oneObtaining digital precode matrix is
Wherein,It is descending power vector,It is multiple unit vector；
Calculated by following manner：
To simulate pre-coding matrix, K is number of users, ifOrderConstruct two matrix Ds and Ω；
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Construction vectorFor noise vector,It is vectorial for K dimensions complete 1,
It is the user power of equivalent up channel；
Digital precode matrix F is solved using following alternative mannerBB, wherein the variable x x in the n-th step iteration(n)Represent, ε1、ε2
For cut-off threshold：
WhenOrWhen
Calculate
Descending power is updated, and is normalized：
Calculate
Ascending power is updated, and is normalized：
To i=1:K
Structural matrixThe optimal beam forming arrow of i-th of user of so the n-th step
AmountIt isWithGeneralized eigenvector corresponding to maximum generalized characteristic value
End loop；
D is updated according to definition(n)、Ω(n)；
Exit circulation.
2. according to the method for claim 1, it is characterised in that calculating simulation pre-coding matrix FRFThe step of include：
If FtIt is the phase deviation vector by being all likely to occurThe matrix of composition, then have
FRFEach row all from FtTaken in matrix, and FRFKth row be FtIn makeMaximumI.e.:
To k=1:K
Make i=argmaxdiag (Ft HAkFt)；
Take
End loop.
3. a kind of computer-readable recording medium, is stored thereon with computer program, it is characterised in that the program is held by processor
The step of methods described as any such as claim 1 to 2 is realized during row.
4. a kind of computer equipment, including memory, processor and it is stored on the memory and can be in the processor
The computer program of upper execution, it is characterised in that realized during the computing device described program as claim 1 to 2 is any
The step of methods described.
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| CN201710571997.XA CN107566020B (en) | 2017-07-13 | 2017-07-13 | Sea area downlink multi-user hybrid precoding method and equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710571997.XA CN107566020B (en) | 2017-07-13 | 2017-07-13 | Sea area downlink multi-user hybrid precoding method and equipment |
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| CN107566020A true CN107566020A (en) | 2018-01-09 |
| CN107566020B CN107566020B (en) | 2020-04-07 |
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| CN108923833A (en) * | 2018-06-22 | 2018-11-30 | 南京航空航天大学 | A kind of transmitting terminal wave beam method for precoding inhibited towards mutual coupling of antenna effect |
| CN110138460A (en) * | 2019-04-23 | 2019-08-16 | 华南理工大学 | Underwater sound communication system resource allocation methods and device with wireless energy capacity gauge |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923833A (en) * | 2018-06-22 | 2018-11-30 | 南京航空航天大学 | A kind of transmitting terminal wave beam method for precoding inhibited towards mutual coupling of antenna effect |
| CN108923833B (en) * | 2018-06-22 | 2021-06-29 | 南京航空航天大学 | Transmitting end beam precoding method for antenna cross coupling effect suppression |
| CN110138460A (en) * | 2019-04-23 | 2019-08-16 | 华南理工大学 | Underwater sound communication system resource allocation methods and device with wireless energy capacity gauge |
| CN110138460B (en) * | 2019-04-23 | 2020-08-18 | 华南理工大学 | Underwater acoustic communication system resource allocation method and device with energy collection capability |
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| CN107566020B (en) | 2020-04-07 |
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