CN101557280B - Method and device for selecting pre-coding matrix/vector in multi-input and multi-output system - Google Patents
Method and device for selecting pre-coding matrix/vector in multi-input and multi-output system Download PDFInfo
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Abstract
The invention provides a method and a device for pre-coding matrix/vector in a multi-input and multi-output system. The method comprises the steps as follows: a data receiving terminal selects the pre-coding matrix index or the pre-coding vector index of a user by judging whether every data stream of the user transferred is retransmission data stream or not. After the condition that the user retransmission is needed or not is considered, pre-coding index information fed back by the user in a multi-input and multi-output pre-coding system is selected, thereby the throughput of the system is further enhanced.
Description
Technical field
The present invention relates to the dispatching method of a kind of effective raising multiple-input, multiple-output pre-coding system link peak rate or cell capacity, particularly relate to system of selection and the device of pre-coding matrix/vector in a kind of mimo systems.
Background technology
In the past few years, it is more and more important that wireless traffic becomes, and higher network capacity and more high performance demand constantly increased simultaneously.Several selection modes as the modulation system of more high bandwidth, optimization even code reuse system in fact to improve the potentiality of spectrum efficiency limited, the emphasis of development has been placed on MIMO (multiple-input and multiple-output, or title " multiple-input, multiple-output ") system, it,, by adopting aerial array, utilizes space multiplexing technique to improve the efficiency of institute's utilized bandwidth.
MIMO will carry out precoding before aerial array data streams, handles up in link or community that MIMO precoding technique can effectively improve under alone family or multi-user environment.The method for precoding adopting at present has unitary matrice and non-unitary matrice.In mimo system, multi-user's scheduling can adopt alone family (SU-MIMO) and multi-user (MU-MIMO) according to load.The system of selection of the PVI (the first-selected vector index of Preferred VectorIndex) that each user is corresponding is based on the maximized principle of spectrum efficiency.For example, for Single User MIMO, each user selects the matrix that makes its CQI (ChanneiQuality Indicator, channel quality information) maximum from precoding set given in advance, and the index of this matrix is fed back to base station.Then base station maximizes dispatched users according to handling up.For multiuser MIMO, each user selects to make the vector of its CQI maximum from precoding set given in advance, and the index of this vector is fed back to base station.Then match to these users base station, and from the user of pairing, select the user of power system capacity maximum is dispatched.System of selection for pre-coding matrix or vector index in alone family and multi-user MIMO system described above does not all consider whether the data that each user intends to transmit are data retransmissions, but all regards all users as biography new data.The possibility of result of PVI feedback has reduced the performance under Single User MIMO system to a certain extent like this, has limited the probability of success of the user's pairing under multi-user MIMO system simultaneously, thereby has reduced handling up of system.
Summary of the invention
The system of selection and the device that the object of this invention is to provide pre-coding matrix/vector in a kind of mimo systems, while solving prior art user feedback antenna index information, do not consider data retransmission, cause having reduced to a certain extent the technical problem of systematic function.
To achieve these goals, the invention provides the system of selection of pre-coding matrix/vector in a kind of mimo systems, wherein, comprise: by data receiver, according to each data flow of the user who is scheduled, whether be to retransmit data flow, select this user's pre-coding matrix index or precoding vectors index.
Above-mentioned method, wherein, described multiple-input, multiple-output pre-coding system is alone family multiple-input, multiple-output pre-coding system, selects in the following manner user's pre-coding matrix index: if there is data retransmission stream and non-data retransmission stream simultaneously, according to non-data retransmission stream, select; If only there is data retransmission stream or only have non-data retransmission stream, select according to existing usual manner.
Above-mentioned method, wherein, at the down direction of data, described receiving terminal is described user, described method further comprises:
Whether step 1, have data retransmission stream described in user judges in each data flow being scheduled, be to perform step two, otherwise execution step three;
Step 2, whether each data flow being scheduled described in user judges is all to retransmit data flow, is to perform step three otherwise execution step four;
Step 3, selection can make channel quality information and the maximum pre-coding matrix index in all data flow, and the described pre-coding matrix index of selecting and corresponding channel quality information feedback are arrived to base station, process ends;
Step 4, selection can make channel quality information and the maximum pre-coding matrix index on all non-data retransmission stream, and the described matrix index of selecting and corresponding channel quality information feedback are arrived to base station, process ends.
Above-mentioned method, wherein, also comprises: step 5, base station, according to the channel quality information of each user feedback and pre-coding matrix index, adopts dispatching algorithm to dispatch.
Above-mentioned method, wherein, select in the following manner user's pre-coding matrix index: if there is data retransmission stream and non-data retransmission stream simultaneously, ensureing that data retransmission can meet under the condition of the Block Error Rate of setting, and only selects according to non-data retransmission stream; If only there is data retransmission stream or only have non-data retransmission stream, ensureing that data retransmission can meet under the condition of the Block Error Rate of setting, and selects according to existing usual manner.
Above-mentioned method, wherein, described multiple-input, multiple-output pre-coding system is multi-user's multiple-input, multiple-output pre-coding systems, and described method further comprises:
Step a, judges whether each data flow that user is scheduled is to retransmit data flow, is to perform step b, otherwise execution step c;
Step b, described user selects can make the precoding vectors index of instantaneous channel quality information maximum and feed back to base station, or described user does not feed back precoding vectors index and channel quality information;
Step c, described user selects can make the precoding vectors index of channel quality information maximum and feed back to base station.
Above-mentioned method, wherein, also comprises:
Steps d, if what retransmit user feedback is the precoding vectors index that makes instantaneous channel quality information maximum, match according to the described precoding vectors index of each user feedback so described base station, scheduling makes user's combination of throughput sum maximum, if match unsuccessful, scheduling makes user's combination that the pre-coding matrix index of throughput sum maximum is corresponding, for not having the precoding vectors in pairing to distribute to the re-transmission user who makes throughput sum maximum in remaining user; If retransmit user, do not feed back precoding vectors index and channel quality information, base station, when user matches, travels through all precoding vectors for retransmitting user so, and then scheduling makes user's combination corresponding to pre-coding matrix of throughput maximum.
Above-mentioned method, wherein, at the up direction of data, described receiving terminal is described base station, described method further comprises:
Whether step 1, have data retransmission stream in each data flow being scheduled described in base station judges, is to perform step two, otherwise execution step three;
Step 2, whether each data flow being scheduled described in base station judgement be all to retransmit data flow, is to perform step three otherwise perform step four;
Step 3, base station selected channel quality information and the maximum pre-coding matrix index that can make in all data flow, and the described pre-coding matrix index of selecting is fed back to this user, process ends after this user is scheduled;
Step 4, base station selected channel quality information and the maximum pre-coding matrix index that can make on all non-data retransmission stream;
Step 5, base station, according to each user's channel quality information and pre-coding matrix index, adopts dispatching algorithm to dispatch, and the user's who is dispatched to described matrix index is fed back to this user.
Above-mentioned method, wherein, in described step 5, described dispatching algorithm adopts the dispatching algorithm of max carrier to interference algorithm or equitable proportion algorithm or other any consideration channel qualities.
A choice device for pre-coding matrix/vector in mimo systems, wherein, comprising:
Computing and judge module, for calculate channel quality information and and corresponding pre-coding matrix index or precoding vectors index, judge whether each data flow that user is scheduled is re-transmission data flow;
Whether, for each data flow of according to user being scheduled be retransmit data flow, select this user's pre-coding matrix index or precoding vectors index if selecting module.
Above-mentioned device, wherein, described multiple-input, multiple-output pre-coding system is alone family multiple-input, multiple-output pre-coding system, described selection module is selected this user's pre-coding matrix index in the following manner: if there is data retransmission stream and non-data retransmission stream simultaneously, according to non-data retransmission stream, select; If only there is data retransmission stream or only have non-data retransmission stream, select according to existing usual manner.
Above-mentioned device, wherein, described multiple-input, multiple-output pre-coding system is multi-user's multiple-input, multiple-output pre-coding systems, and comprise base station, be used for: according to the described precoding vectors index of each user feedback, match, if match unsuccessfully, dispatch the user of single throughput maximum, select the re-transmission user who retransmits user or select throughput maximum to match with the user of described single throughput maximum simultaneously at random.
Above-mentioned device, wherein, described computing and judge module comprise data flow acquisition module and PMI acquisition module; Described data flow acquisition module is used for obtaining data flow; Described PMI acquisition module comprises N bar Data Stream Processing branch road, and N equals each data flow that described user is scheduled for retransmitting or the permutation and combination number of non-data retransmission stream, every corresponding a kind of combined situation of described processing branch road.
Above-mentioned device, wherein, described computing and judge module comprise data flow acquisition module, data-flow detection unit and PMI acquisition module; Described data flow acquisition module is used for obtaining data flow; Described detecting unit is re-transmission or non-data retransmission stream for detection of each data flow; Described PMI acquisition module calculates and selects to make channel quality information and the maximum pre-coding matrix index of all non-data retransmission streams according to the testing result of described detecting unit.
Above-mentioned device, wherein, described detecting unit, by the signal to noise ratio information of described data flow and the thresholding of setting are compared, determines that described data flow is for retransmitting or non-data retransmission stream.
Above-mentioned device, wherein, described computing and judge module comprise data flow acquisition module, judge module and PMI acquisition module; Described PMI acquisition module further comprises CQI computing module and PMI computing module; Described data flow acquisition module is used for obtaining data flow; Described judge module is used for judging that whether described data flow is to retransmit data flow, and notify described PMI computing module; Described CQI computing module is used for obtaining the channel quality information of channel, and sends to described PMI computing module; Whether described PMI computing module is to retransmit pre-coding matrix index corresponding to data-flow computation, and send to described selection module according to described channel quality information and described data flow.
Technique effect of the present invention is:
The present invention, after considering that whether user retransmits, then selects the index information of user feedback in MIMO pre-coding system, can further improve handling up of system, can effectively improve multiple-input, multiple-output pre-coding system link peak rate or cell capacity.
The present invention is in multi-user's situation, unsuccessful if user matches, and the user that another one flow point dispensing need to be retransmitted has increased the probability matching like this, has improved handling up of system simultaneously.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the inventive method is applied in the 2x2 MIMO pre-coding system at alone family;
Fig. 2 is the schematic diagram that the inventive method is applied in multi-user's MIMO pre-coding system;
Fig. 3 is the structure chart of the user side of pre existing coded system;
Fig. 4 is the structure chart of the user side embodiment of pre-coding system of the present invention;
Fig. 5 is the structure chart of another embodiment of user side of pre-coding system of the present invention;
Fig. 6 is the structure chart of user side the 3rd embodiment of pre-coding system of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
The present invention is mainly that the selection for effective vector index provides a kind of method in MIMO pre-coding system, and the method is considering further to improve handling up of system after whether user retransmits.
The present invention is divided into two kinds of situations according to the difference of MIMO pre-coding system number of users, and a kind of is single user situation, and another kind is multi-user's situation, below with regard to both of these case, is elaborated.
One, single user situation.
The application of the present invention in descending Single User MIMO system is PMI (the first-selected matrix index of the Preferredmatrix Index) system of selection based on retransmitting.
For Single User MIMO system, the data of sending out on all antennas user same, if existed in the situation that new data and data retransmission coexist, when selecting PMI, the PMI that the present invention selects makes to pass CQI and the maximum in new data stream.If all data flow are all to pass new data or data retransmission, select so PMI to make CQI and the maximum in all data flow.Then the matrix index that each user feedback is chosen oneself is to base station, and base station is according to each user CQI and PMI, and scheduling makes the user of throughput of system maximum.This system of selection is to take new data stream as preferential completely, and the present invention also can make data retransmission meet under certain Block Error Rate (BLER) condition certainly, take new data stream as preferential.The 2x2 mimo system of take is below introduced the concrete steps flow process of method of the present invention as example:
As shown in Figure 1, for 2x2 MIMO pre-coding system, if two data flow of BS (base station) end are all distributed to the different data of same user concurrent.Under this environment, the PMI system of selection based on retransmitting is described below:
1) if user 1 is scheduled, and in data flow 1 and data flow 2 minute supplementary biography be new data and data retransmission, the principle of carrying out PMI selection at user side is so to make the CQI of data flow 1 maximum.
2), if be all new data or data retransmission in data flow 1 and data flow 2, the principle of carrying out PMI selection at user side is so to make that CQI's in data flow 1 and data flow 2 is maximum with value.
After user 1 PMI and corresponding CQI determine, will feed back to transmitting terminal (base station), base station will be dispatched user according to various dispatching algorithms (equitable proportion PF, max carrier to interference MaxC/I).
Two, multi-user's situation.The application of the present invention in descending multi-user mimo system is the user's matching method based on retransmitting.
As shown in Figure 2, in multi-user MIMO system, on every antenna of base station, send the data of different user.Idiographic flow of the present invention is described below:
1) each user selects according to certain principle and feeds back PVI and CQI.This principle comprises: if user sends out new data, according to maximum CQI principle, select PVI and feed back to base station, if user's data retransmission, it can be selected PVI and feed back to base station according to traditional maximum CQI principle, also can not feed back PVI and CQI.
2) BS matches according to the PVI of each user feedback.
For traditional method, unsuccessful if user matches, only have so a user to be scheduled, and only have data that spread this user.Can cause the wasting of resources like this.If the user unsuccessful but user matches, another one flow point dispensing need to retransmit, has increased the probability matching like this, improved handling up of system simultaneously.
In the present invention, if what retransmit user feedback is the precoding vectors index that makes instantaneous channel quality information maximum, match according to the described precoding vectors index of each user feedback base station so, scheduling makes user's combination of throughput sum maximum, if match unsuccessful, scheduling makes user's combination that the pre-coding matrix index of throughput sum maximum is corresponding, for not having the precoding vectors in pairing to distribute to the re-transmission user who makes throughput sum maximum in remaining user; If retransmit user, do not feed back precoding vectors index and channel quality information, base station, when user matches, travels through all precoding vectors for retransmitting user so, and then scheduling makes user's combination corresponding to pre-coding matrix of throughput maximum.
Described method of the present invention can realize in descending process from base station to user side that transmitted data by, also can in up process from user side to base station that transmitted data by, realize.
While realizing in the up process of data, receiving terminal is base station, and described method further comprises:
Whether step 1, have data retransmission stream in each data flow being scheduled described in base station judges, is to perform step two, otherwise execution step three;
Step 2, whether each data flow being scheduled described in base station judgement be all to retransmit data flow, is to perform step three otherwise perform step four;
Step 3, base station selected channel quality information and the maximum pre-coding matrix index that can make in all data flow, and the described pre-coding matrix index of selecting is fed back to this user, process ends after this user is scheduled;
Step 4, base station selected channel quality information and the maximum pre-coding matrix index that can make on all non-data retransmission stream;
Step 5, base station, according to each user's channel quality information and pre-coding matrix index, adopts dispatching algorithm to dispatch, and the user's who is dispatched to described matrix index is fed back to this user.
In the present invention, be according to each data flow of the user who is scheduled, whether to be to retransmit data flow by data receiver, select this user's pre-coding matrix index or precoding vectors index.At down direction, receiving terminal can be user, at up direction receiving terminal, can be base station, and receiving terminal is not limited to user and base station, introducing under the condition of relaying and other equipment, can be any equipment with similar functions.
Corresponding above method, the present invention also provides the choice device of user antenna index information in a kind of multiple-input, multiple-output pre-coding system, comprise: computing and judge module, for calculate channel quality information and and corresponding pre-coding matrix index or precoding vectors index, and judge whether each data flow that user is scheduled is to retransmit data flow; Whether, for each data flow of according to user being scheduled be retransmit data flow, select this user's pre-coding matrix index or precoding vectors index if selecting module.
Described choice device of the present invention can be realized in descending process from base station to user side that transmitted data by, also can in up process from user side to base station that transmitted data by, realize.
Wherein, under single user situation, described selection module is selected this user's pre-coding matrix index in the following manner: if there is data retransmission stream and non-data retransmission stream simultaneously, according to non-data retransmission stream, select; If only there is data retransmission stream or only have non-data retransmission stream, select according to existing usual manner.
In multi-user's situation, also comprise base station, for: according to the described precoding vectors index of each user feedback, match, if match unsuccessful, the user of a leaflet throughput maximum, selects to need the user that retransmits or the re-transmission user of throughput maximum to match with it simultaneously at random.
With reference to figure 3, structure chart for the user side of pre existing coded system, existing user side obtains after the data flow of channel at data flow acquisition module 301, by PMI acquisition module 302, according to preset conventional P MI selection strategy, directly calculated, namely based on the maximized principle of spectrum efficiency, choose corresponding PMI, by user feedback module 303, the PMI choosing is fed back to base station afterwards.
Fig. 4 is the structure chart of the user side embodiment of pre-coding system of the present invention; As figure, because do not know whether before PMI acquisition module 402 calculates as retransmitting, so the present invention is provided with N bar Data Stream Processing branch road, N equals each data flow that described user is scheduled for retransmitting or the permutation and combination number of non-data retransmission stream, PMI acquisition module in every described processing branch road all presets different strategies, every kind of corresponding a kind of combined situation of strategy.
For example, in the situation that user has 2 data flow, may there be four kinds of permutation and combination situations
1) complete in retransmitting data flow;
2) be entirely non-data retransmission stream;
3) data flow 1 is for retransmitting data flow, and data flow 2 is non-data retransmission stream;
4) data flow 1 is non-data retransmission stream, and data flow 2 is for retransmitting data flow.
For these four kinds of situations, in PMI acquisition module 402, be provided with respectively corresponding branch road, can be according to selection algorithm, the PMI of correspondence in the various combination situation whether calculating correctly receives in each data flow, and because user feedback module 403 is from judging that the judge module 401 whether each data flow correctly receives known whether data flow is re-transmission, so just can know that the combined situation which bar branch road is corresponding is consistent with data flow re-transmission situation, the PMI that just can obtain according to the corresponding branch road in this PMI acquisition module comes to base station feedback.
Certainly, also can, before PMI acquisition module calculates, first judge that whether data flow is re-transmission, so just can only adopt a processing branch road.Fig. 5 is the structure chart of another embodiment of user side of pre-coding system of the present invention, as figure.Between data flow acquisition module 501 and PMI acquisition module 502, added detecting unit 504, for detection of each data flow, correctly whether receive, be that each data flow is for retransmitting or non-data retransmission stream, detecting unit 504 can be by comparing the signal to noise ratio information of described data flow and the thresholding of setting, determine that described data flow is for retransmitting or non-data retransmission stream, whether PMI acquisition module 502 just can directly retransmit to calculate according to data flow like this, select afterwards corresponding PMI, then by user feedback module 503, the PMI choosing is fed back to base station.
Fig. 6 is the structure chart of user side the 3rd embodiment of pre-coding system of the present invention, and it is the improvement to Fig. 4, because every branch road of PMI acquisition module 402 all will calculate respectively PMI in Fig. 4, has produced a large amount of double countings.In Fig. 6, PMI acquisition module 602 comprises CQI, acquiring unit 6021, for obtaining the CQI of channel, and preserve, and judge module 401 has known whether data flow is, after retransmitting, directly to inform the PMI computing module 6022 in PMI acquisition module 402, like this, even if many branch roads need to be set, be also the branch road only moving wherein, it is just passable that the definite situation only whether retransmitting according to data flow is calculated a PMI.As from the foregoing, the present invention has following advantage:
1) the present invention is after considering that whether user retransmits, then selects the index information of user feedback in MIMO pre-coding system, can further improve handling up of system, can effectively improve multiple-input, multiple-output pre-coding system link peak rate or cell capacity.
2) the present invention is in multi-user's situation, unsuccessful if user matches, and the user that another one flow point dispensing need to be retransmitted has increased the probability matching like this, has improved handling up of system simultaneously.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. whether a system of selection for pre-coding matrix in mimo systems, is characterized in that, comprising: by data receiver, according to each data flow of the user who is scheduled, be to retransmit data flow, select this user's pre-coding matrix index;
Described mimo systems is alone family multiple-input, multiple-output pre-coding system,
At the down direction of data, described receiving terminal is described user, and whether described is to retransmit data flow by data receiver according to each data flow of the user who is scheduled, selects this user's pre-coding matrix index further to comprise:
Whether step 1, have data retransmission stream described in user judges in each data flow of the user who is scheduled, be to perform step two, otherwise execution step three;
Step 2, whether each data flow of the user who is scheduled described in user judges is all to retransmit data flow, is to perform step three otherwise execution step four;
Step 3, selection can make channel quality information and the maximum pre-coding matrix index in all data flow, and the described pre-coding matrix index of selecting and corresponding channel quality information feedback are arrived to base station, process ends;
Step 4, selection can make channel quality information and the maximum pre-coding matrix index on all non-data retransmission stream, and the described pre-coding matrix index of selecting and corresponding channel quality information feedback are arrived to base station, process ends.
2. method according to claim 1, is characterized in that, also comprises:
Step 5, base station, according to the channel quality information of each user feedback and pre-coding matrix index, adopts max carrier to interference algorithm or equitable proportion algorithm to dispatch.
3. whether a system of selection for precoding vectors in mimo systems, is characterized in that, comprising: by data receiver, according to each data flow of the user who is scheduled, be to retransmit data flow, select this user's precoding vectors index; Described mimo systems is multi-user's multiple-input, multiple-output pre-coding systems, and described method further comprises:
Step a, judges whether each data flow that user is scheduled is to retransmit data flow, is to perform step b, otherwise execution step c;
Step b, described user selects can make the precoding vectors index of instantaneous channel quality information maximum and feed back to base station, or described user does not feed back precoding vectors index and channel quality information;
Step c, described user selects can make the precoding vectors index of channel quality information maximum and feed back to base station.
4. method according to claim 3, is characterized in that, also comprises:
Steps d, if what retransmit user feedback is the precoding vectors index that makes instantaneous channel quality information maximum, match according to the described precoding vectors index of each user feedback so described base station, scheduling makes user's combination of throughput sum maximum, if match unsuccessful, scheduling makes user's combination that the pre-coding matrix index of throughput sum maximum is corresponding, for not having the precoding vectors in pairing to distribute to the re-transmission user who makes throughput sum maximum in remaining user; If retransmit user, do not feed back precoding vectors index and channel quality information, base station, when user matches, travels through all precoding vectors for retransmitting user so, and then scheduling makes user's combination corresponding to pre-coding matrix of throughput maximum.
5. whether a system of selection for pre-coding matrix in mimo systems, is characterized in that, comprising: by data receiver, according to each data flow of the user who is scheduled, be to retransmit data flow, select this user's pre-coding matrix index;
Described mimo systems is alone family multiple-input, multiple-output pre-coding system, and at the up direction of data, described receiving terminal is described base station, and described method further comprises:
Whether step 1, have data retransmission stream in each data flow of the user who is scheduled described in base station judges, is to perform step two, otherwise execution step three;
Step 2, whether each data flow of the user who is scheduled described in base station judgement be all to retransmit data flow, is to perform step three otherwise perform step four;
Step 3, base station selected channel quality information and the maximum pre-coding matrix index that can make in all data flow, and the described pre-coding matrix index of selecting is fed back to this user, process ends after this user is scheduled;
Step 4, base station selected channel quality information and the maximum pre-coding matrix index that can make on all non-data retransmission stream;
Step 5, base station, according to each user's channel quality information and pre-coding matrix index, adopts max carrier to interference algorithm or equitable proportion algorithm to dispatch, and the user's who is dispatched to described precoding matrix index feedback is arrived to this user.
6. a choice device for pre-coding matrix/vector in mimo systems, is characterized in that, comprising:
Computing and judge module, for calculate channel quality information and and corresponding pre-coding matrix index or precoding vectors index, judge whether each data flow that user is scheduled is re-transmission data flow;
Whether, for each data flow of according to user being scheduled be retransmit data flow, select this user's pre-coding matrix index or precoding vectors index if selecting module;
When described mimo systems is alone family multiple-input, multiple-output pre-coding system, described selection module is selected this user's pre-coding matrix index in the following manner:
If there is data retransmission stream and non-data retransmission stream simultaneously, according to non-data retransmission stream, to select, selection can make channel quality information and the maximum pre-coding matrix index on all non-data retransmission stream;
If only have data retransmission stream or only have non-data retransmission stream, the pre-coding matrix index of selecting makes channel quality in all data flow and maximum;
When described mimo systems is multi-user's multiple-input, multiple-output pre-coding system, and comprise base station, be used for: according to the described precoding vectors index of each user feedback, match, if match unsuccessful, dispatch the user of single throughput maximum, random selection simultaneously retransmits user or selects the re-transmission user of throughput maximum to match with the user of described single throughput maximum.
7. device according to claim 6, is characterized in that, described computing and judge module comprise data flow acquisition module and PMI acquisition module;
Described data flow acquisition module is used for obtaining data flow;
Described PMI acquisition module comprises N bar Data Stream Processing branch road, N equals each data flow that described user is scheduled for retransmitting or the permutation and combination number of non-data retransmission stream, and every described processing branch road is for obtaining the pre-coding matrix index under corresponding a kind of combined situation.
8. device according to claim 6, is characterized in that, described computing and judge module comprise data flow acquisition module, judge module and PMI acquisition module; Described PMI acquisition module further comprises CQI computing module and PMI computing module;
Described data flow acquisition module is used for obtaining data flow;
Described judge module is used for judging that whether described data flow is to retransmit data flow, and notify described PMI computing module;
Described CQI computing module is used for obtaining the channel quality information of channel, and sends to described PMI computing module;
Whether described PMI computing module is to retransmit pre-coding matrix index corresponding to data-flow computation, and send to described selection module according to described channel quality information and described data flow.
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| JP2009095933A JP5667749B2 (en) | 2008-04-11 | 2009-04-10 | Precoding matrix / vector selection method and apparatus in multi-input multi-output system |
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| CN102356586B (en) * | 2009-03-16 | 2015-06-03 | 马维尔国际贸易有限公司 | Multi-user multiple input multiple output (mu-mimo) receiver |
| JP5381405B2 (en) * | 2009-06-30 | 2014-01-08 | 富士通株式会社 | Wireless communication system, wireless communication device, and control device |
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| CN1832390A (en) * | 2005-03-07 | 2006-09-13 | 松下电器产业株式会社 | Retransmit method based on reliability estimation in multi-antenna adaptive transmit |
| CN1832392A (en) * | 2005-03-11 | 2006-09-13 | 松下电器产业株式会社 | Data retransmit method and equipment in multi-input, multi-output system |
| CN101146078A (en) * | 2006-12-27 | 2008-03-19 | 中兴通讯股份有限公司 | A selection method for multi-input and multi-output space multiplexing pre-coding matrix |
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| JP5667749B2 (en) | 2015-02-12 |
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