CN101729112A - Multi-user beamforming method and multi-user beamforming device for multi-input multi-output system - Google Patents
Multi-user beamforming method and multi-user beamforming device for multi-input multi-output system Download PDFInfo
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Abstract
The invention discloses a multi-user beamforming method and a multi-user beamforming device for a multi-input multi-output (MIMO) system. The method comprises the following steps that: a, a BS acquires the DOA of each user in the MIMO system; b, the BS groups users, namely the users satisfy a predetermined grouping condition are grouped into the same user group; and c, the BS determines a beamforming transmission weight of each user according to the DOAs of the users in each user group, and the data stream of each user is transmitted by an antenna after being multiplied by the beamforming transmission weight thereof. The device is positioned on one side of the BS and comprises a DOA acquisition module, a user grouping module, a data stream processing module and the antenna. The technical scheme of the invention realizes the multi-user beamforming on the basis of null broadening in the MIMO system.
Description
Technical field
The present invention relates to MIMO (Multiple Input and Multiple Output, multiple-input and multiple-output) system, relate in particular to a kind of multi-user beam-forming method and device of mimo system.
Background technology
Mimo system can effectively improve channel capacity, and therefore, the MIMO technology has become in the research of LTE (Long Term Evolution, 3GPP tissue is for a long-run development, the evolution plan of 3G network) the extremely technology paid close attention to of people.
Beam forming technique passes through orientation, user place and distinguishes the user, and by the direction of control wave beam and the concrete shape of beam pattern, the signal of removing between the multi-user disturbs, and the realization multi-user is multiplexing to identical time, frequency resource.Beam forming technique is particularly useful for spacious suburb scene, can obtain tangible beam energy gain, enlarges the coverage of sub-district.
At present, the mimo system multi-user beam-forming of also being unrealized, but the signal of removing between the multi-user by interference eliminated class algorithm disturbs.BS (Base Station, when the base station) adopting interference eliminated class algorithm, must at first obtain the channel matrix of user's down channel, when mimo system adopted FDD (Frequency Division Duplex, Frequency Division Duplexing (FDD)) mode, BS can only obtain the channel matrix of down channel according to user's feedback, therefore in the algorithm running, data volume is bigger, and efficient is lower, and the signal effects of jamming is not satisfactory between the removal multi-user.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of multi-user beam-forming method and device of mimo system, has realized the multi-user beam-forming based on zero sunken broadening in mimo system.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of multi-user beam-forming method of mimo system may further comprise the steps:
A, BS obtain the Bo Dajiao of each user in the mimo system;
B, described BS carry out user grouping, and the user who satisfies default branch set condition is divided into same user's group;
C, described BS reach the beam shaping emission value that each user is determined at the angle according to the ripple that each user group comprises the user, and send by antenna after each user's data stream is multiplied by its beam shaping emission value.
In the such scheme, among the described step a, when described mimo system adopted TDD (TimeDivision Duplex, time division duplex) mode, described BS obtained user's Bo Dajiao by following steps:
A11, described BS utilize channel reciprocity up and down, determine the channel matrix of user's down channel according to the channel matrix of user uplink channel;
A12, described BS obtain described user's Bo Dajiao according to the channel matrix of described user's down channel.
In the such scheme, among the described step c, described BS determines each user's beam shaping emission value by following steps:
C1, described BS organize the Bo Dajiao that comprises the user according to each user, adopt zero to fall into the beam shaping weights that the broadening algorithm generates each user;
C2, described BS make orthogonalization process to the beam shaping weights that each user's group comprises the user, obtain each user's beam shaping emission value.
In the such scheme, the wave beam of each user's beam shaping weights correspondence reaches dihedral at its ripple and becomes main lobe, reaches dihedral at other user's of its place user group ripple and becomes zero to fall into.
In the such scheme, among the described step a, when described mimo system adopted the FDD mode, described BS carried out DOA (Direction of arrival, direction of arrival) estimation to obtain described user's Bo Dajiao to described user's upward signal.
In the such scheme, among the described step a, when described mimo system adopted the FDD mode, described BS obtained user's Bo Dajiao by following steps:
A21, described user carry out DOA and estimate, determine that ripple reaches the angle;
A22, described user obtain the digital value that described ripple reaches the angle correspondence according to default quantizing rule;
A23, described user feed back to described BS with described digital value;
The corresponding relation that digital value that a24, described BS basis is default and ripple reach the angle obtains the corresponding ripple of described digital value and reaches the Bo Dajiao of angle as described user.
In the such scheme, among the described step a, when described mimo system adopted the FDD mode, described BS obtained user's Bo Dajiao by following steps:
A31, described user carry out down channel and estimate, determine the channel matrix of down channel;
A32, described user determine that according to the channel matrix of described down channel ripple reaches the angle;
A33, described user obtain the digital value that described ripple reaches the angle correspondence according to default quantizing rule;
A34, described user feed back to described BS with described digital value;
The corresponding relation that digital value that a35, described BS basis is default and ripple reach the angle obtains the corresponding ripple of described digital value and reaches the Bo Dajiao of angle as described user.
A kind of multi-user beam-forming device of mimo system, described multi-user beam-forming device is positioned at the BS side, comprising:
Ripple reaches the angle acquisition module, is used for obtaining each user's of mimo system Bo Dajiao;
User grouping module is used to carry out user grouping, and the user who satisfies default branch set condition is divided into same user's group;
The Data Stream Processing module is used for organizing the ripple that comprises the user according to each user and reaches the beam shaping emission value that each user is determined at the angle, and each user's data stream is multiplied by its beam shaping emission value;
Antenna is used for the data flow of each user after described Data Stream Processing resume module sent.
In the such scheme, described Data Stream Processing module comprises beam shaping weights determination module, beam shaping emission value determination module and weighting block;
Described beam shaping weights determination module is used for comprising according to each user's group user's Bo Dajiao, adopts zero to fall into the beam shaping weights that the broadening algorithm generates each user;
Described beam shaping emission value determination module is used for that each user is organized the beam shaping weights that comprise the user and makes orthogonalization process, obtains each user's beam shaping emission value;
Weighting block is used for each user's data stream is multiplied by its beam shaping emission value.
Beneficial effect of the present invention mainly shows: multi-user beam-forming method provided by the invention can be realized by multi-user beam-forming device provided by the invention, in this method, fall into the beam shaping weights that the broadening algorithm has been determined each user by wave beam zero, and further each user is organized the beam shaping weights that comprise the user and make orthogonalization process, obtain the beam shaping emission value that each user's group comprises the user, thereby in mimo system, realized the control of multi-user beam direction and the concrete shape of beam pattern, the signal of having removed between the multi-user disturbs, and is multiplexing with frequency when having realized the multi-user to system resource.
Description of drawings
Fig. 1 is the multi-user beam-forming flow chart of mimo system of the present invention;
Fig. 2 is the structural representation of the multi-user beam-forming device of mimo system of the present invention.
Embodiment
Multi-user of the present invention is meant the user more than 2 or 2, and the invention will be further described below in conjunction with accompanying drawing.
With reference to Fig. 1, a kind of multi-user beam-forming method of mimo system may further comprise the steps:
S101:BS obtains the Bo Dajiao of each user in the mimo system;
When mimo system adopts the TDD mode, when the ripple that BS obtains the user reaches the angle, at first utilize channel reciprocity up and down, determine the channel matrix of this user's down channel according to the channel matrix of this user uplink channel; Then, obtain this user's Bo Dajiao according to the channel matrix of this user's down channel;
When mimo system adopted the FDD mode, BS can be by a kind of Bo Dajiao that obtains the user in following three kinds of modes:
Mode one:
BS carries out the DOA estimation to obtain this user's Bo Dajiao to this user's upward signal;
Mode two:
1, this user carries out the DOA estimation, determines that ripple reaches the angle;
2, this user obtains the digital value that this ripple reaches the angle correspondence according to default quantizing rule;
3, this user feeds back to BS with this digital value;
4, the BS corresponding relation that reaches the angle according to default digital value and ripple obtains the corresponding ripple of this digital value and reaches the Bo Dajiao of angle as this user;
Mode three:
1, this user carries out the down channel estimation, determines the channel matrix of down channel;
2, this user determines that according to the channel matrix of down channel ripple reaches the angle;
3, this user obtains the digital value that this ripple reaches the angle correspondence according to default quantizing rule;
4, this user feeds back to BS with this digital value;
5, the BS corresponding relation that reaches the angle according to default digital value and ripple obtains the corresponding ripple of this digital value and reaches the Bo Dajiao of angle as this user;
S102:BS carries out user grouping, and the user who satisfies default branch set condition is divided into same user's group;
S103:BS organizes the Bo Dajiao that comprises the user according to each user, adopts zero to fall into the beam shaping weights that the broadening algorithm generates each user; Wherein, the wave beam of each user's beam shaping weights correspondence reaches dihedral at its ripple and becomes main lobe, reach dihedral at other user's of its place user group ripple and become zero to fall into, thereby the signal that has reduced between the multi-user disturbs;
S104:BS makes orthogonalization process to the beam shaping weights that each user's group comprises the user, obtains each user's beam shaping emission value;
S105:BS sends by antenna after each user's data stream is multiplied by its beam shaping emission value.So far, the multi-user beam-forming flow process of mimo system is finished, and is multiplexing with frequency when having realized the multi-user to system resource.
With reference to Fig. 2, a kind of multi-user beam-forming device of mimo system is positioned at the BS side, comprising:
Ripple reaches the angle acquisition module, is used for obtaining each user's of mimo system Bo Dajiao;
User grouping module is used to carry out user grouping, and the user who satisfies default branch set condition is divided into same user's group;
The Data Stream Processing module is used for organizing the ripple that comprises the user according to each user and reaches the beam shaping emission value that each user is determined at the angle, and each user's data stream is multiplied by its beam shaping emission value;
Antenna is used for the data flow of each user after the Data Stream Processing resume module sent.
Wherein, the Data Stream Processing module further comprises beam shaping weights determination module, beam shaping emission value determination module and weighting block;
Beam shaping weights determination module is used for comprising according to each user's group user's Bo Dajiao, adopts zero to fall into the beam shaping weights that the broadening algorithm generates each user;
Beam shaping emission value determination module is used for that each user is organized the beam shaping weights that comprise the user and makes orthogonalization process, obtains each user's beam shaping emission value;
Weighting block is used for each user's data stream is multiplied by its beam shaping emission value.
The above is embodiments of the invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (9)
1. the multi-user beam-forming method of a multi-input multi-output system is characterized in that, may further comprise the steps:
A, base station obtain the Bo Dajiao of each user in the multi-input multi-output system;
User grouping is carried out in b, described base station, and the user who satisfies default branch set condition is divided into same user's group;
C, described base station reach the beam shaping emission value that each user is determined at the angle according to the ripple that each user's group comprises the user, and send by antenna after each user's data stream is multiplied by its beam shaping emission value.
2. the multi-user beam-forming method of multi-input multi-output system as claimed in claim 1 is characterized in that, among the described step a, when described multi-input multi-output system adopted time division duplex, described base station obtained user's Bo Dajiao by following steps:
A11, described base station utilize channel reciprocity up and down, determine the channel matrix of user's down channel according to the channel matrix of user uplink channel;
A12, described base station obtain described user's Bo Dajiao according to the channel matrix of described user's down channel.
3. the multi-user beam-forming method of multi-input multi-output system as claimed in claim 2 is characterized in that, among the described step c, each user's beam shaping emission value is determined in described base station by following steps:
The Bo Dajiao that comprises the user is organized according to each user in c1, described base station, adopts zero to fall into the beam shaping weights that the broadening algorithm generates each user;
Orthogonalization process is made to the beam shaping weights that each user's group comprises the user in c2, described base station, obtains each user's beam shaping emission value.
4. the multi-user beam-forming method of multi-input multi-output system as claimed in claim 3, it is characterized in that: the wave beam of each user's beam shaping weights correspondence reaches dihedral at its ripple and becomes main lobe, reaches dihedral at other user's of its place user group ripple and becomes zero to fall into.
5. the multi-user beam-forming method of multi-input multi-output system as claimed in claim 1, it is characterized in that, among the described step a, when described multi-input multi-output system adopted the Frequency Division Duplexing (FDD) mode, the direction of arrival estimation was carried out to obtain described user's Bo Dajiao to described user's upward signal in described base station.
6. the multi-user beam-forming method of multi-input multi-output system as claimed in claim 1 is characterized in that, among the described step a, when described multi-input multi-output system adopted the Frequency Division Duplexing (FDD) mode, described base station obtained user's Bo Dajiao by following steps:
A21, described user carry out direction of arrival and estimate, determine that ripple reaches the angle;
A22, described user obtain the digital value that described ripple reaches the angle correspondence according to default quantizing rule;
A23, described user feed back to described base station with described digital value;
The corresponding relation that digital value that a24, described base station basis are preset and ripple reach the angle obtains the corresponding ripple of described digital value and reaches the Bo Dajiao of angle as described user.
7. the multi-user beam-forming method of multi-input multi-output system as claimed in claim 1 is characterized in that, among the described step a, when described multi-input multi-output system adopted the Frequency Division Duplexing (FDD) mode, described base station obtained user's Bo Dajiao by following steps:
A31, described user carry out down channel and estimate, determine the channel matrix of down channel;
A32, described user determine that according to the channel matrix of described down channel ripple reaches the angle;
A33, described user obtain the digital value that described ripple reaches the angle correspondence according to default quantizing rule;
A34, described user feed back to described base station with described digital value;
The corresponding relation that digital value that a35, described base station basis are preset and ripple reach the angle obtains the corresponding ripple of described digital value and reaches the Bo Dajiao of angle as described user.
8. the multi-user beam-forming device of a multi-input multi-output system is characterized in that, described multi-user beam-forming device is positioned at base station side, comprising:
Ripple reaches the angle acquisition module, is used for obtaining each user's of multi-input multi-output system Bo Dajiao;
User grouping module is used to carry out user grouping, and the user who satisfies default branch set condition is divided into same user's group;
The Data Stream Processing module is used for organizing the ripple that comprises the user according to each user and reaches the beam shaping emission value that each user is determined at the angle, and each user's data stream is multiplied by its beam shaping emission value;
Antenna is used for the data flow of each user after described Data Stream Processing resume module sent.
9. the multi-user beam-forming device of multi-input multi-output system as claimed in claim 8 is characterized in that:
Described Data Stream Processing module comprises beam shaping weights determination module, beam shaping emission value determination module and weighting block;
Described beam shaping weights determination module is used for comprising according to each user's group user's Bo Dajiao, adopts zero to fall into the beam shaping weights that the broadening algorithm generates each user;
Described beam shaping emission value determination module is used for that each user is organized the beam shaping weights that comprise the user and makes orthogonalization process, obtains each user's beam shaping emission value;
Weighting block is used for each user's data stream is multiplied by its beam shaping emission value.
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Application publication date: 20100609 |