CN102457324B - A kind of frequency division duplex system descending multi-user multipath beam form-endowing method and device - Google Patents
A kind of frequency division duplex system descending multi-user multipath beam form-endowing method and device Download PDFInfo
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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
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
- H04B7/0473—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking constraints in layer or codeword to antenna mapping into account
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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
- H04B7/0617—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 for beam forming
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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
- H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
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Abstract
The invention discloses a kind of frequency division duplex system descending multi-user multipath beam form-endowing method and device, wherein said method comprises: base station is estimated to obtain multiple footpath according to the upward signal of each user respectively, and determines that each user may be used for the footpath of transfer of data according to the decision rule preset; Described base station, according to the maximum transmitted number of plies W of each user, is selected W optimum footpath from all may be used for of all users, and is used a described W footpath to carry out transfer of data to described each user the footpath of transfer of data; Wherein, W is positive integer.By the present invention, in FDD system, realize the multipath beamforming transmission technology of multi-user, multiple data flow can be sent for multiple user simultaneously, strengthen the throughput of user and system.
Description
Technical field
The present invention relates to intelligent antenna beam shaping technical field, more specifically, relate to a kind of FDD(FrequencyDivisionDuplexing, Frequency Division Duplexing (FDD)) system descending multi-user multi-path beam form-endowing method and device.
Background technology
MIMO(MultipleInputandMultipleOutput, multiple-input and multiple-output) system becomes LTE(LongTermEvolution because it effectively can improve channel capacity, Long Term Evolution), the extremely technology paid close attention to of people in the research of LTE+.
In Single User MIMO pattern, by the weighted vector designing suitable transmitting antenna and reception antenna, multiple data flow can be transmitted by multiple layer simultaneously, and parallel transmission between the data that can make multiple layers, remove interlayer interference.
In multiuser MIMO pattern, the direction of shaped-beam can be designed by the weighted vector designing suitable transmitting antenna and reception antenna, the signal of dividing multi-user, remove inter-user interference.
The method of wave beam forming distinguishes user by orientation, user place, thus can realize multiple user multiplexing identical time, frequency resource.Miniature antenna spacing (0.5 λ) situation is conducive to controlling beam position, is more suitable for application of beam figuration (Beamforming) technology.Beamforming technique also can transmit in several directions the strongest to the signal of same user, to utilize several footpaths the strongest in multi-path channel environment simultaneously.
Beamforming technique mainly carries out work by controlling beam direction, than being more suitable for spacious suburb scene.Wave beam forming can obtain obvious beam energy gain, can expand the covering of community.Beamforming technique also may be used for complicated urban area circumstance simultaneously, utilizes the algorithm of beam direction class can utilize the direction in several footpaths that signal is the strongest, utilizes several the footpaths that the algorithm of channel matrix decomposition class can use channel capacity best.
Beamforming technique utilizes antenna array structure can obtain the wave beam of characteristic direction, therefore obvious beam energy gain can be obtained, this can improve MPS process and power system capacity, reduce system interference and increase power system capacity, improve link reliability, improve peak rate, beamforming technique effectively can improve the performance of edge user, for LTE+ system, existing single current beamforming technique can be extended to multi-flow beam forming technology, stand good in single user, thus improve the throughput of user.
For the 3GPP(ThirdGenerationPartnershipProject being about to start to formulate, third generation partner program) Rel-10 standard, base station side number of antennas will extend to more than 8, end side number of antennas will extend to more than 4, for the beamforming technique in future, control the number of plies that uses of wave beam forming and thus the abundant and reasonable problem that spatial channel resources must be utilized to become important.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of frequency division duplex system descending multi-user multipath beam form-endowing method and device, the multipath beamforming transmission technology of multi-user is realized in FDD system, multiple data flow can be sent for multiple user simultaneously, strengthen the throughput of user and system.
For solving the problems of the technologies described above, the invention provides a kind of frequency division duplex system descending multi-user multipath beam form-endowing method, comprising:
Base station is estimated to obtain multiple footpath according to the upward signal of each user respectively, and determines that each user may be used for the footpath of transfer of data according to the decision rule preset;
Described base station, according to the maximum transmitted number of plies W of each user, is selected W optimum footpath from all may be used for of all users, and is used a described W footpath to carry out transfer of data to described each user the footpath of transfer of data; Wherein, W is positive integer.
Further, described maximum transmitted number of plies W is the minimum value between base station side number of transmit antennas and described user's reception antenna number.
Further, the footpath of described optimum refers to the footpath that the gain factor of downstream signal arrival receiving terminal is maximum.
Further, described upward signal comprises: up soundingRS pilot tone (SRS pilot tone);
The described decision rule preset is: if the receiving terminal signal to noise ratio of the downlink data in described footpath is more than or equal to the threshold value preset, then judge that described footpath is by inspection.
Further, described method also comprises:
Described base station is when determining that each user may be used for the footpath of transfer of data, and the number that each user determined may be used for the footpath of transfer of data is less than or equal to the number of base station side transmitting antenna, and is less than or equal to the number of described user's reception antenna.
Further, when described base station uses a described W footpath to carry out transfer of data to described each user, select the emission value that the characteristic vector corresponding to a described W footpath uses as the data flow in described each footpath respectively.
Present invention also offers a kind of frequency division duplex system descending multi-user multipath beam size enlargement apparatus, be applied to base station, described device comprises:
Judging module, estimates to obtain multiple footpath for the upward signal respectively according to each user, and determines that each user may be used for the footpath of transfer of data according to the decision rule preset;
Multipath transmissions module, according to the maximum transmitted number of plies W of each user, selects W optimum footpath from all may be used for of all users, and uses a described W footpath to carry out transfer of data to described each user the footpath of transfer of data; Wherein, W is positive integer, and W is the minimum value between base station side number of transmit antennas and described user's reception antenna number.
Further, the footpath of the described optimum that described multipath transmissions module is selected, refers to the footpath that the gain factor of downstream signal arrival receiving terminal is maximum.
Further, described judging module is used for, estimate to obtain k footpath according to the uplink SRS pilot tone of described user, and determine that described user may be used for the footpath of transfer of data according to following decision rule: if the receiving terminal signal to noise ratio of the downlink data in described footpath is more than or equal to the threshold value preset, then judge that described footpath may be used for the footpath of transfer of data;
Wherein, k is positive integer, and k is less than or equal to the number of base station side transmitting antenna, and is less than or equal to the number of described user's reception antenna.
Further, described multipath transmissions module is used for, and when using a described W footpath to carry out transfer of data to described each user, selects the emission value that the characteristic vector corresponding to a described W footpath uses as the data flow in described each footpath respectively.
Compared with prior art, such scheme provided by the invention at least has following beneficial effect: the program can send multiple data flow for multiple user simultaneously, the DOA(DirectionofArrival of multipath signal is utilized in FDD system, direction of arrival) angle and carry out multiple data stream transmission, add the throughput of user and system.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the principle schematic of the FDD system multi-user beam shaping method according to the embodiment of the present invention;
Fig. 2 is the schematic flow sheet of the FDD system multi-user beam shaping method according to the embodiment of the present invention.
Embodiment
In FDD system, due to the frequency range that up channel is different from residing for down channel, up channel and down channel do not have reciprocity, directly descending channel information cannot be obtained by uplink channel information, namely base station side cannot obtain the information of down channel matrix, and channel matrix cannot be used to do Eigenvalues Decomposition and obtain the method for beam shaping emission value.Namely method that cannot use this optimum, that utilize channel capacity to greatest extent.
For the problems referred to above that prior art exists, a kind of descending multi-user wave beam forming strategy protocol being applicable to FDD system of proposition of the present invention, the main thought of the program is, in view of FDD system has the restriction of above-mentioned characteristic, the present invention considers the beam form-endowing method of use angle class, that is: eNB(evolvedNodeB, evolved base station) signal peak that obtains from multiple angle is estimated according to the upward signal of each user, and can be understood as the signal from multiple footpath, space from the signal of multiple angle, and according to information such as the gains in these multiple footpaths, detect that each user is applicable to carry out the footpath of transfer of data, last select from all footpaths of all users gain factor maximum needed for the footpath of number to carry out transfer of data, realize transmission multi-user being carried out to multipath wave beam forming downstream signal.
Based on above-mentioned thought, the invention provides a kind of frequency division duplex system descending multi-user multipath beam form-endowing method, the following technical scheme of concrete employing:
Base station is estimated to obtain multiple footpath according to the upward signal of each user respectively, and determines that each user may be used for the footpath of transfer of data according to the decision rule preset;
Described base station, according to the maximum transmitted number of plies W of each user, is selected W optimum footpath from all may be used for of all users, and is used a described W footpath to carry out transfer of data to described each user the footpath of transfer of data; Wherein, W is positive integer.
Wherein, described maximum transmitted number of plies W is the minimum value between base station side number of transmit antennas and described user's reception antenna number.
Wherein, the footpath of described optimum refers to the footpath that the gain factor of downstream signal arrival receiving terminal is maximum.
Further, described base station by MUSIC(MultipleSignalClassification, multiple signal classification) algorithm or CAPON algorithm estimate multiple power peaks of described upward signal, and draw corresponding multiple footpath.
Further, described upward signal comprises: up soundingRS pilot tone (SRS pilot tone).
Further, described decision rule is: if the receiving terminal signal to noise ratio after the data in certain footpath arrive receiving terminal is greater than the threshold value preset, then judge that this footpath is by inspection.
Further, when base station uses a described W footpath to carry out transfer of data to described each user, select the emission value that the characteristic vector corresponding to a described W footpath uses as the data flow in described each footpath respectively.
Following several parameter is related in such scheme of the present invention.
1) emitting side signal to noise ratio:
sNR tX , this value is the given value of transmitting terminal.
2) make to receive correct block rate (i.e. 1-BLER(Block Error Rate)) preferred value that reaches P(P is 70%) time received signal to noise ratio:
sNR rX ,
sNR rX be and receive the signal-noise ratio threshold value that Block Error Rate reaches P, this threshold value is also given value usually.
3) being estimated by upward signal that the signal in the Article 1 footpath obtained arrives the gain factor of receiving terminal is λ
1; The gain factor of the signal arrival receiving terminal in Article 2 footpath is λ
2; The gain factor of the signal arrival receiving terminal in f article of footpath is λ
f .
According to above parameter, the signal to noise ratio after the data arrival receiving terminal of layer 1 is
sNR tX * λ
1, the signal to noise ratio after the data arrival receiving terminal of layer 2 is
sNR tX * λ
2, the signal to noise ratio after the data arrival receiving terminal of layer f is
sNR tX * λ
f .
According to above scheme, adjudicating the decision rule whether certain layer (footpath) can be used in transfer of data by inspection is: whether the signal to noise ratio after the data of layer arrive receiving terminal is greater than threshold value
sNR rX , the signal to noise ratio namely after the data of certain one deck arrive receiving terminal is greater than threshold value
sNR rX time, then can think that the data of this layer can normal decoder, this one deck can transmit.Signal to noise ratio after having the data of k layer to arrive receiving terminal is greater than threshold value
sNR rX time, then total k layer transmits simultaneously.
Then, comprehensive all users determine that the data in which footpath (layer) can be transmitted.For each user, having determined k layer can transmit, but when the transmission number of plies of all users add up be greater than W time, just have data flow and be difficult to decoding, this is because the interference between user causes.
As a rule, the number of data streams sum of each user needs to be less than the minimum value between base station side number of transmit antennas and each user's reception antenna number.Suppose that base station side number of transmit antennas is N, the reception antenna number of each user is M.Then the preferred value of W is f, f=min(M, N), namely f is the minimum value of M and N.
Therefore, only need from all footpaths of all users, select the footpath of W optimum altogether for transfer of data.Preferably, transfer of data is carried out in the footpath can choosing the multiple λ of W gain maximum, and uses the emission value that the maximum characteristic vector corresponding to footpath of the multiple λ of this W gain uses as the data flow in each footpath.That is, the angle that each footpath is corresponding unique, the emission value that each angle is corresponding unique, the such as angle of+30 degree, corresponding weights are exactly [1j-1-j].
For the ease of setting forth the present invention, be described in further detail below with reference to the enforcement of drawings and the specific embodiments to technical solution of the present invention.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
Fig. 1 shows the schematic diagram of the transmitting chain involved by the present invention program, the data of W layer are through high-level scheduling, carry out the mapping between multiple user and data flow, each data flow adds respective dedicated pilot, many transmit antennas are mapped to, by arriving multiple subscriber equipment after space channel after being multiplied by emission value vector respectively again.
Fig. 2 shows the schematic flow sheet of the frequency division duplex system descending multi-user multipath beamforming scheme of the embodiment of the present invention, and its concrete implementation step is described below:
The first step: eNB can according to the DOA angle in the footpath of up soundingRS pilot tone (SRS pilot tone) estimating user, here need the angle in the multiple footpaths estimating the upward signal power peak obtained from user, and multiple angle is designated as respectively DOA1, DOA2 ... DOAf.Here MUSIC algorithm, CAPON algorithm scheduling algorithm can be used.
Second step: estimate the signal peak obtained from multiple angle, signal from multiple angle can be understood as the signal from multiple footpath, space, detect the signal strength signal intensity obtained from each footpath simultaneously, thus estimate the multiple λ of the gain after obtaining the downstream signal arrival receiving terminal in the direction in every bar footpath
1,λ
2λ
f .
3rd step: (whether the signal to noise ratio after the data arrival receiving terminal of layer is greater than threshold value to use decision rule
sNR rX ) obtain k the footpath that can be used for doing transfer of data, thus determine can carry out transfer of data k deflection DOA1, DOA2 ... DOAk.
4th step: comprehensive all users determine that the data in which footpath can be transmitted, from all footpaths of all users, selects W footpath altogether for transfer of data.
Transfer of data is carried out in the footpath can choosing the multiple λ of W gain maximum from all footpaths of all users, selects this W gain λ
f the emission value that corresponding characteristic vector uses as the data flow of this layer.
5th step: according to DOA1DOA2 ... DOAw can obtain W row emission value W1W2 respectively ... the beam direction that Ww, W1 weighted vector is corresponding is beam direction that DOA1, W2 weighted vector is corresponding be the beam direction that DOA2, Ww weighted vector is corresponding is DOAw.
6th step: to W1, W2 ... Ww carries out orthogonalization process, then is normalized, and obtains emission value W1, W2 that mutually orthogonal and modulus value is 1 ' ... Ww '.
Wherein, W2 ' ... Ww ' and W2 ... the direction of the wave beam corresponding to Ww is substantially identical, similar nature.The advantage of carrying out orthogonalization process is W1, W2 ' ... mutually orthogonal between two between Ww ', decrease the interference between two data flow, therefore use W2 ' ... Ww ' replace W2 ... Ww is weighted the 2nd data flow to W footpath.
7th step: the data flow that transmit direction is DOA1 ~ DOAw is encoded, modulated.
8th step: layer dedicated pilot separately (DedicatedReferenceSignal, referred to as DRS) corresponding to each footpath is loaded respectively to the data flow that transmit direction is DOA1 ~ DOAw.
9th step: corresponding emission value is multiplied by respectively to the data flow that transmit direction is DOA1 ~ DOAw, namely corresponding emission value W1W2 ' is multiplied by ... Ww ', thus map data into transmitting antenna, and carry out spacing wave transmission by antenna, complete beamforming process.
Tenth step: signal receiving is carried out according to dedicated pilot in each receiving terminal and subscriber equipment (UserEquipment, referred to as UE) side.
In addition, additionally provide a kind of frequency division duplex system descending multi-user multipath beam size enlargement apparatus in the embodiment of the present invention, be applied to base station, this device mainly comprises following functions module:
Judging module, estimates to obtain multiple footpath for the upward signal respectively according to each user, and determines that each user may be used for the footpath of transfer of data according to the decision rule preset;
Multipath transmissions module, according to the maximum transmitted number of plies W of each user, selects W optimum footpath from all may be used for of all users, and uses a described W footpath to carry out transfer of data to described each user the footpath of transfer of data; Wherein, W is positive integer, and W is the minimum value between base station side number of transmit antennas and described user's reception antenna number.
Further, the footpath of the described optimum that described multipath transmissions module is selected, refers to the footpath that the gain factor of downstream signal arrival receiving terminal is maximum.
Further, described judging module is used for, estimate to obtain k footpath according to the uplink SRS pilot tone of described user, and determine that described user may be used for the footpath of transfer of data according to following decision rule: if the receiving terminal signal to noise ratio of the downlink data in described footpath is more than or equal to the threshold value preset, then judge that described footpath may be used for the footpath of transfer of data;
Wherein, k is positive integer, and k is less than or equal to the number of base station side transmitting antenna, and is less than or equal to the number of described user's reception antenna.
Further, described multipath transmissions module is used for, and when using a described W footpath to carry out transfer of data to described each user, selects the emission value that the characteristic vector corresponding to a described W footpath uses as the data flow in described each footpath respectively.
These are only preferred case study on implementation of the present invention; be not limited to the present invention; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art can make various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the present invention.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
Claims (8)
1. a frequency division duplex system descending multi-user multipath beam form-endowing method, is characterized in that,
Base station is estimated to obtain multiple footpath according to the upward signal of each user respectively, and determines that each user may be used for the footpath of transfer of data according to the decision rule preset;
Described base station, according to the maximum transmitted number of plies W of each user, is selected W optimum footpath from all may be used for of all users, and is used a described W footpath to carry out transfer of data to described each user the footpath of transfer of data; Wherein, W is positive integer;
Wherein, determine that the decision rule that each user may be used for transfer of data is: whether the signal to noise ratio after the data in footpath arrive receiving terminal is greater than the threshold value preset, namely when the signal to noise ratio after the data in a certain footpath arrive receiving terminal is greater than threshold value, then think that the data in this footpath can normal decoder, this footpath may be used for transmission; When the signal to noise ratio after having the data in k footpath to arrive receiving terminal is greater than the threshold value preset, then total k footpath is transmitted simultaneously; K is positive integer, and k is less than or equal to the number of base station side transmitting antenna, and is less than or equal to the number of described user's reception antenna;
When described base station uses a described W footpath to carry out transfer of data to described each user, select the emission value that the characteristic vector corresponding to a described W footpath uses as the data flow in described each footpath respectively, and load the dedicated pilot DRS separately of layer corresponding to each footpath respectively.
2. the method for claim 1, is characterized in that,
Described maximum transmitted number of plies W is the minimum value between base station side number of transmit antennas and described user's reception antenna number.
3. the method for claim 1, is characterized in that,
The footpath of described optimum refers to the footpath that the gain factor of downstream signal arrival receiving terminal is maximum.
4. the method for claim 1, is characterized in that,
Described upward signal comprises: up soundingRS pilot tone (SRS pilot tone).
5. method as claimed in claim 1 or 2, it is characterized in that, described method also comprises:
Described base station is when determining that each user may be used for the footpath of transfer of data, and the number that each user determined may be used for the footpath of transfer of data is less than or equal to the number of base station side transmitting antenna, and is less than or equal to the number of described user's reception antenna.
6. a frequency division duplex system descending multi-user multipath beam size enlargement apparatus, is characterized in that, be applied to base station, and described device comprises:
Judging module, estimates to obtain multiple footpath for the upward signal respectively according to each user, and determines that each user may be used for the footpath of transfer of data according to the decision rule preset; According to following decision rule, described judging module determines that each user may be used for the footpath of transfer of data: whether the signal to noise ratio after the data arrival receiving terminal in footpath is greater than the threshold value preset, namely when the signal to noise ratio after the data in a certain footpath arrive receiving terminal is greater than threshold value, then think that the data in this footpath can normal decoder, this footpath may be used for transmission; When the signal to noise ratio after having the data in k footpath to arrive receiving terminal is greater than the threshold value preset, then total k footpath is transmitted simultaneously; K is positive integer, and k is less than or equal to the number of base station side transmitting antenna, and is less than or equal to the number of described user's reception antenna;
Multipath transmissions module, according to the maximum transmitted number of plies W of each user, selects W optimum footpath from all may be used for of all users, and uses a described W footpath to carry out transfer of data to described each user the footpath of transfer of data; Wherein, W is positive integer, and W is the minimum value between base station side number of transmit antennas and described user's reception antenna number; Also for when using a described W footpath to carry out transfer of data to described each user, select the emission value that the characteristic vector corresponding to a described W footpath uses as the data flow in described each footpath respectively, and load the dedicated pilot DRS separately of layer corresponding to each footpath respectively.
7. device as claimed in claim 6, is characterized in that,
The footpath of the described optimum that described multipath transmissions module is selected, refers to the footpath that the gain factor of downstream signal arrival receiving terminal is maximum.
8. device as claimed in claim 6, is characterized in that,
Described judging module is used for, and estimates to obtain k footpath according to the uplink SRS pilot tone of described user.
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| CN201010525188.3A CN102457324B (en) | 2010-10-29 | 2010-10-29 | A kind of frequency division duplex system descending multi-user multipath beam form-endowing method and device |
| PCT/CN2010/079715 WO2012055131A1 (en) | 2010-10-29 | 2010-12-13 | Downlink multi-user multipath beamforming method and apparatus for frequency division duplexing system |
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| CN201010525188.3A CN102457324B (en) | 2010-10-29 | 2010-10-29 | A kind of frequency division duplex system descending multi-user multipath beam form-endowing method and device |
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| CN102457324B true CN102457324B (en) | 2015-12-16 |
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| RU2790101C1 (en) * | 2019-07-16 | 2023-02-14 | Зте Корпорейшн | Multipath interference eliminating method and device and a machine-readable data carrier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102457320A (en) * | 2010-11-01 | 2012-05-16 | 中兴通讯股份有限公司 | Downlink single-user multipath beam forming method and device for frequency division duplex system |
| KR101995266B1 (en) * | 2012-08-17 | 2019-07-02 | 삼성전자 주식회사 | Method and apparatus for system access in system using beam forming |
| US9867192B2 (en) * | 2014-10-24 | 2018-01-09 | Futurewei Technologies, Inc. | System and method for beam selection using multiple frequencies |
| JP6472704B2 (en) * | 2015-04-24 | 2019-02-20 | 国立研究開発法人情報通信研究機構 | Wireless communication system |
| CN107231694A (en) * | 2016-03-25 | 2017-10-03 | 北京信威通信技术股份有限公司 | The method of adjustment and system of downlink transfer |
| CN112242856A (en) * | 2019-07-16 | 2021-01-19 | 中兴通讯股份有限公司 | Method and device for eliminating multipath interference and computer readable storage medium |
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| CN101729112A (en) * | 2008-10-24 | 2010-06-09 | 中兴通讯股份有限公司 | Multi-user beamforming method and multi-user beamforming device for multi-input multi-output system |
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| CN101072066B (en) * | 2006-05-08 | 2011-05-11 | 中兴通讯股份有限公司 | Intelligent antenna realizing method for CDMA communication system |
| CN101192868A (en) * | 2006-11-24 | 2008-06-04 | 中兴通讯股份有限公司 | Multi-service wave bundle shaping device for wireless communication system |
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| CN101729112A (en) * | 2008-10-24 | 2010-06-09 | 中兴通讯股份有限公司 | Multi-user beamforming method and multi-user beamforming device for multi-input multi-output system |
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| RU2790101C1 (en) * | 2019-07-16 | 2023-02-14 | Зте Корпорейшн | Multipath interference eliminating method and device and a machine-readable data carrier |
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| WO2012055131A1 (en) | 2012-05-03 |
| CN102457324A (en) | 2012-05-16 |
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