CN101399590A - Feedback selection method and device in multi-user pre-coding system - Google Patents
Feedback selection method and device in multi-user pre-coding system Download PDFInfo
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Abstract
The invention discloses a feedback selection method in a multi-user precoding system. The method comprises the following steps: a receiving end is subject to channel estimation to obtain a current channel quality corresponding to various code words in a precoding codebook; the code words which are dispatched successfully before the current period are determined, and the corresponding code word with the highest current channel quality is selected as a precoding code word to be currently fed back of the receiving end. The invention also discloses a feedback selection device which comprises a storage module, a channel estimation module and a code word selection module. The feedback selection proposal of the invention can effectively improve the performance of the multi-user precoding system.
Description
Technical field
The present invention relates to multi-user wireless communication technology, space division multiplexing access (SDMA) technology and precoding technique, relate in particular to feedback system of selection and feedback choice device in multi-user pre-coding (precoding) system under a kind of SDMA pattern.
Background technology
Future mobile communications is had higher requirement to wireless communication system at aspects such as transmission rate, performance and system business capacity.Multiple-input and multiple-output (MIMO) system all adopts multi-antenna structure at transmitting terminal and receiving terminal, the power system capacity and availability of frequency spectrum linear growth exponentially not only, thereby satisfy the requirement of high transfer rate, high-transmission performance and high system business capacity, but also can utilize space diversity to improve the performance of communication system fully.
Precoding is meant at transmitting terminal carries out preliminary treatment to signal to be sent earlier, and then the signal after receiving terminal sends processing.Precoding technique is a kind of key technology that improves the mimo system performance.Usually, will adopt the mimo system of precoding technique to be called multi-user pre-coding system.
In multi-user pre-coding system, the precoding technique that is based on code book comparatively commonly used at present.Specifically, system is according to the information such as the probability distribution of channel, variation when variance is isometric, according to such as criterions such as maximum capacity, minimum error rates, pre-determine the code word that comprises in the code book, these code words can occur with the form of matrix or vector; After determining code word, also preserve at transmitting terminal and receiving terminal.In the feedback selection course, receiving terminal at first carries out channel estimating according to the pilot frequency information from transmitting terminal, and then selects optimum pre-encoding codeword according to channel estimation results.After this, receiving terminal reports transmitting terminal with codewords indexes, and transmitting terminal utilizes this pre-encoding codeword that signal to be sent is carried out precoding processing.In message transmitting procedure, transmitting terminal will send to receiving terminal through the signal to be sent of precoding, so that receiving terminal receives and detect data.
For the multi-user pre-coding system under the SDMA pattern, code word in the code book is formed several pre-coding matrixes, each vector in this matrix is a code word, each code word is only corresponding to user's a data flow, and the different vectors in the same matrix can be to the data flow of the identical or different user that should be able to carry out space division multiplexing.In the feedback selection course, the pilot frequency information that receiving terminal transmits according to transmitting terminal carries out channel estimating and obtains channel quality information, determines this self optimum code word, the i.e. the highest code word of CQI according to channel quality information.After the feedback selection course finished, receiving terminal sent to transmitting terminal with channel quality information and codewords indexes; Transmitting terminal carries out resource allocation and multi-subscriber dispatching according to the channel quality information and the codewords indexes of receiving terminal feedback, selects the receiving terminal of this message transmission, and the determined code word of these receiving terminals must be arranged in same pre-coding matrix.For example, suppose to comprise in the precoding code book two pre-coding matrix [V
0, V
1] and [V
2, V
3], suppose that the code word that obtains receiving terminal 1, receiving terminal 2 and receiving terminal 3 feedbacks as the base station of transmitting terminal is respectively: V
0, V
1And V
3, because V
0And V
1Be arranged in same matrix, receiving terminal 1 and receiving terminal 2 can carry out spatial reuse so, then transmitting terminal chooses these two receiving terminals to transmit information simultaneously, be that these two receiving terminals are successfully dispatched, the receiving terminal of successfully not dispatched 3 be merely able to wait for the message transmitting procedure of receiving terminal 1 and receiving terminal 2 finish after feedback channel quality information and pre-encoding codeword index again, and whether selected determine again by transmitting terminal.
By foregoing description as seen, when feeding back in the multi-user pre-coding system under the SDMA pattern, receiving terminal will report transmitting terminal by optimum pre-encoding codeword index for self.Like this, when number of users more after a little while, it is higher that the pre-encoding codeword of each receiving terminal feedback can't be arranged in the probability of same pre-coding matrix, promptly the user to match incomplete probability higher.Because transmitting terminal had just carried out resource allocation before user's scheduling, no matter whether receiving terminal is successfully dispatched, this receiving terminal has all taken a space resources and power resource, therefore under the user matches incomplete probability condition with higher, the wasting of resources is comparatively serious, thereby can cause the deterioration of systematic function.
In addition, the number of users of each pre-coding matrix correspondence equals the merchant of total number of users and pre-coding matrix quantity usually.Be N at total number of users, when pre-coding matrix quantity is n, on average the number of users of each pre-coding matrix is N/n.As seen, when number of users was big, probability increased though match completely on the average meaning, and the number of users of average each pre-coding matrix correspondence tails off.In multi-user pre-coding system, the number of users that participates in scheduling is big more, and systematic function is good more.Like this, though match the raising of complete probability systematic function is made moderate progress, the minimizing of the number of users of each pre-coding matrix correspondence can reduce systematic function.Therefore, when number of users is big, adopt the mode of the optimum code word of above-mentioned selection, still can make the performance of system be subjected to bigger restriction.
Summary of the invention
The invention provides the feedback system of selection in a kind of multi-user pre-coding system, improve systematic function.
In feedback system of selection of the present invention, comprising: receiving terminal is carried out channel estimating, obtain the current channel quality of each code word correspondence in the precoding code book; Determine the code word that current period was successfully dispatched before, select corresponding current channel quality soprano, as the pre-encoding codeword current to be feedback of this receiving terminal.
The present invention also provides the choice device of the feedback in a kind of multi-user pre-coding system, improves systematic function.
In feedback choice device of the present invention, comprising: memory module, channel estimation module and code word are selected module, and wherein, described memory module is preserved the precoding code book of place receiving terminal and the code word that current period was successfully dispatched before; Described channel estimation module reads precoding code book from described memory module, the place receiving terminal is carried out channel estimating, obtains the current channel quality of each code word correspondence in the precoding code book; Described code word is selected the current channel quality of module reception from each code word correspondence of channel estimation module, from memory module, read code word, from the code word that reads, select corresponding current channel quality soprano, as the pre-encoding codeword current to be feedback of this receiving terminal.
The present invention will once successfully be dispatched and be chosen as in the code word of the high channel quality of current period correspondence the pre-encoding codeword to be feedback of current period before the current period in the feedback selection course of multi-user pre-coding system.When receiving terminal is successfully dispatched, show that the employed code word of this receiving terminal can be arranged in same pre-coding matrix with the code word that other receiving terminals use simultaneously, can realize that promptly pairing is fully.The present invention is in the giving consideration to channel quality, and code word was as the basis of feedback selection completely with once matching, and the probability that makes the employed code word of each receiving terminal be arranged in same matrix improves greatly.Therefore, technical scheme of the present invention can reduce the simple wasting of resources of considering the channel quality of code word and bringing in the prior art effectively, thereby improves the performance of multi-user pre-coding system effectively.
In addition, before also will current period in the embodiments of the invention by successful scheduling but meet the code word of the selection principle that sets in advance and the code word that do not appear in the historical dispatching record also joins in the candidate codewords formation, therefore avoided omission to a great extent, can further improve and match success rate completely more excellent candidate codewords.
Description of drawings
To make clearer above-mentioned and other feature and advantage of the present invention of those of ordinary skill in the art by describe exemplary embodiment of the present invention in detail with reference to accompanying drawing below, in the accompanying drawing:
Fig. 1 is the exemplary process diagram of feedback system of selection among the present invention;
Fig. 2 is the exemplary configurations schematic diagram of feedback choice device among the present invention;
Fig. 3 is the flow chart of feedback system of selection in the embodiment of the invention 1;
Fig. 4 is the structural representation of feedback choice device in the embodiment of the invention 1;
Fig. 5 is the flow chart of feedback system of selection in the embodiment of the invention 2;
Fig. 6 is the flow chart of feedback system of selection in the embodiment of the invention 3;
Fig. 7 is the structural representation of feedback choice device in the embodiment of the invention 3;
Fig. 8 is the flow chart of feedback system of selection in the embodiment of the invention 4;
Fig. 9 is the flow chart of feedback system of selection in the embodiment of the invention 5;
Figure 10 is the structural representation of feedback choice device in the embodiment of the invention 5;
Figure 11 is the flow chart of feedback system of selection in the embodiment of the invention 6.
Embodiment
For making purpose of the present invention, technical scheme clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
When the present invention carried out the feedback selection in multi-user pre-coding system, receiving terminal was a foundation with self historical feedback information and scheduling result, will once be chosen as current pre-encoding codeword to be feedback by the code word of successfully dispatching and the respective channels quality is the highest.
Fig. 1 shows the exemplary process diagram of feedback method among the present invention, and referring to Fig. 1, this method comprises:
In step 101, receiving terminal is carried out channel estimating, obtain the current channel quality of each code word correspondence in the precoding code book;
In step 102, select corresponding current channel quality soprano the code word of before current period, once successfully being dispatched, as the pre-encoding codeword current to be feedback of this receiving terminal.
Fig. 2 shows the exemplary configurations schematic diagram of feedback device among the present invention, and referring to Fig. 2, this feedback device comprises: memory module, channel estimation module and code word are selected module.In these above-mentioned modules, memory module is preserved the precoding code book of place receiving terminal and the code word that current period was once successfully dispatched before; Channel estimation module reads precoding code book from memory module, the place receiving terminal is carried out channel estimating, obtains the current channel quality of each code word correspondence in the precoding code book, and is transferred to code word selection module; Code word is selected the current channel quality of module reception from each code word correspondence of channel estimation module, from memory module, read code word, from the code word that reads, select corresponding current channel quality soprano, as the pre-encoding codeword current to be feedback of this receiving terminal.
From above-mentioned description to Fig. 1 and Fig. 2 as seen, the present invention will once successfully be dispatched and be chosen as in the code word of the high channel quality of current period correspondence the pre-encoding codeword to be feedback of current period before the current period in the feedback selection course of multi-user pre-coding system.When receiving terminal is successfully dispatched, show that the employed code word of this receiving terminal can be arranged in same pre-coding matrix with the code word that other receiving terminals use simultaneously, can realize that promptly pairing is fully.The present invention is in the giving consideration to channel quality, and code word was as the basis of feedback selection completely with once matching, and the probability that makes the employed code word of each receiving terminal be arranged in same matrix improves greatly.Therefore, technical scheme of the present invention can reduce the simple wasting of resources of considering the channel quality of code word and bringing in the prior art effectively, thereby improves the performance of multi-user pre-coding system effectively.
The code word of successfully being dispatched before the above-mentioned current period can be recorded in the historical dispatching record, and can utilize current pre-encoding codeword to be feedback to replace and upgrade this history dispatching record.Certainly, this history dispatching record not only can be taked to put down in writing successfully the form of the code word of scheduling, can also put down in writing the code word of n cycle correspondence before the current period and whether by information such as successful scheduling, wherein n be set in advance more than or equal to 1 positive integer.Table 1 shows a kind of historical dispatching record.
| Cycle | Codewords indexes | Scheduling result |
| -1 | 0 | Not success |
| -2 | 2 | Success |
| -3 | 1 | Not success |
The historical dispatching record of table 1
What preserve in above-mentioned table 1 is the schedule information in 3 cycles before the current period, and codewords indexes 0,2,1 is corresponding code word V respectively
0, V
2And V
1
The present invention can also be on the basis that goes out flow process shown in Figure 1 candidate's scope of the current pre-encoding codeword to be feedback of expansion, promptly set up content in advance and be empty candidate codewords formation, except the code word of will successfully be dispatched before the current period joins the candidate codewords formation, also will not appear at code word in the historical dispatching record as candidate codewords yet, and according to predetermined selection principle determine in the present historical dispatching record but the code word of successfully not dispatched whether as candidate codewords.Selection principle wherein can be for random chance principle, channel quality principle, equitable proportion (PF) priority principle, random chance in conjunction with channel quality principle and random chance in conjunction with PF priority principle etc.Below by embodiment the feedback selection scheme among the present invention is described.
Embodiment 1
Make up historical dispatching record according to the form shown in the table 1 in the present embodiment, and selection principle is the random chance principle.
Fig. 3 shows the flow chart of feedback system of selection in the present embodiment, and referring to Fig. 3, this method comprises:
In step 301, receiving terminal is carried out channel estimating, obtain the current C QI of each code word correspondence in the precoding code book.
In this step, the pilot frequency information that can issue according to transmitting terminal is carried out channel estimating, obtains the pairing CQI of each code word in the precoding code book of receiving terminal, to determine each code word corresponding channel quality.
In step 302, with first code word in the precoding code book as current code word.
In step 303, judge whether current code word appears in the historical dispatching record, if then execution in step 304, otherwise, execution in step 307.
Owing to only can put down in writing finite information in the historical dispatching record in the present embodiment, and code word not appear in this history dispatching record may be owing to select for use the time gap current period of this code word longer, and this code word might be in current period corresponding channel quality best, therefore for fear of missing more excellent code word, in the present embodiment when current code word is not described in the historical dispatching record, the directly operation that current code word is added the candidate codewords formation in the execution in step 307.
In step 304～305, judge whether interior receiving terminal of corresponding cycle of current code word is successfully dispatched, if then execution in step 307; Otherwise generate a random number that is positioned between the interval [0,1], and execution in step 306.
If by the query history dispatching record determine current code word in the pairing cycle receiving terminal successfully dispatched, then show and use this code word to make receiving terminal match that possibility is higher completely, so this code word also is to select one of the candidate of the pre-encoding codeword to be feedback of current period.Otherwise, because the selection principle in the present embodiment is the random chance principle, for the current code word situation that receiving terminal is not successfully dispatched in the corresponding cycle, just need get rid of current code word according to random chance, promptly generate a random number, so that utilize this random number decision whether current code word to be included in the candidate codewords formation in the subsequent step.
In step 306, whether judge the random number that is generated greater than the random chance thresholding that sets in advance, if then execution in step 307, otherwise, execution in step 308.
Also can be in this step in random number execution in step 307 during, execution in step 308 greater than the random chance thresholding time smaller or equal to the random chance thresholding.
In step 307, current code word is added in the candidate codewords formation.
Under following three kinds of situations, current code word is joined in the candidate codewords formation in the present embodiment: the first, current code word does not appear in the historical dispatching record; The second, current code word appears in the historical dispatching record and is successfully dispatched; The 3rd, current code word appears in the historical dispatching record and is not successfully dispatched, but is kept according to the random chance thresholding.For first kind of situation,,, it is added the candidate codewords formation for fear of omission owing to can't reflect the pairing situation that current code word was once corresponding in the historical dispatching record; For second kind of situation, historical dispatching record reflects that current code word is brought and matches that probability is higher completely, therefore as candidate codewords; For the third situation, though historical dispatching record reflect that current code word is brought and match that probability is lower completely, but still be to avoid omitting more excellent code word, therefore abandon this code word according to random chance.Code word under second kind of above-mentioned situation is to improve the main completely basis of pairing, and other in addition two kinds of situations auxiliary makes and can select code word comparatively neatly in the present embodiment under many principles, thereby prevent the deterioration of systematic function.
In step 308～310, judge whether current code word is last code word, if, then from the candidate codewords formation, select the to be feedback pre-encoding codeword of the code word of CQI maximum as current period, and process ends; Otherwise, turn to the next code word in the precoding code book, and return execution in step 303.
Owing to successively whether each code word in the precoding code book is carried out judgement as candidate codewords in the present embodiment, therefore only after each code word has all been carried out above-mentioned judgement, after promptly having collected whole candidate codewords, just select according to the channel quality principle of optimality.
So far, the feedback that finishes in the present embodiment is selected flow process.
From above-mentioned flow process as seen, in the present embodiment from dwindling range of choice and preventing principles such as omission, the multiple situation that may occur has been carried out thorough consideration, make the code word that chooses to bring the complete success rate of higher pairing, can bring the good channel quality again, so that improve systematic function.
In addition, in order to guarantee that historical dispatching record can reflect the scheduling situation in each cycle that closes on current period comparatively in time, so can also be after step 309 in the present embodiment pre-encoding codeword to be feedback of selected current period be joined in the historical schedule information.Consider the shared storage resources of historical information record, can also delete record apart from current period cycle correspondence farthest.Above-mentioned adding operation and adding and deletion action all can be called is to utilize the pre-encoding codeword to be feedback of current period to upgrade historical schedule information record.
Fig. 4 shows the structural representation of feedback device in the present embodiment, and referring to Fig. 4, this device has increased the random number generation module on the basis of Fig. 2.
Specifically, the feedback device in the present embodiment comprises: memory module, channel estimation module, code word are selected module and random number generation module.
Memory module in the present embodiment is preserved precoding code book, historical dispatching record, the random chance thresholding that sets in advance and the candidate codewords formation of place receiving terminal, and the difference of this module and Fig. 2 is the preservation that has increased code word, random chance thresholding and the candidate codewords formation of successfully not dispatched before the current period.
Channel estimation module reads code book from memory module, the place receiving terminal is carried out channel estimating, obtains the current C QI of each code word correspondence in the precoding code book, and is transferred to code word selection module.
Code word is selected the current channel quality of module reception from each code word correspondence of channel estimation module, from memory module, read historical dispatching record and random chance thresholding, when the current code word that reads from memory module does not appear in the historical record or current code word appears in the historical dispatching record and receiving terminal is successfully dispatched in the corresponding cycle, this code word is joined in the candidate codewords formation; Appear in the historical record but when receiving terminal is not successfully dispatched in the corresponding cycle in current code word, notice random number generation module generates random number, reception comes from the random number of random number generation module, determines whether current code word is joined in the candidate codewords formation according to this random number and random chance thresholding; And after finishing the determining of current period candidate codewords formation, from the candidate codewords formation, select the to be feedback pre-encoding codeword of the code word of CQI maximum as current period.The random number generation module generates random number under the notice of code word selection module, and sends to code word selection module.
In addition, code word selects module also to utilize historical dispatching record in the pre-encoding codeword updated stored module to be feedback of current period.
Above-mentioned feedback selection flow process and feedback choice device are applicable at least one receiving terminal in the multi-user pre-coding system, and each receiving terminal can independently be carried out the feedback of self and select.
For the multi-user pre-coding system that comprises two receiving terminal U1 and U2 altogether, suppose to include two pre-coding matrixes, i.e. [V in the precoding code book of each receiving terminal
0, V
1] and [V
2, V
3]; And suppose that the random chance thresholding is 0.4.So, use present embodiment, the CQI that obtains four code words of receiving terminal U1 correspondence respectively is 12,8,6,2, and the CQI of four code words of receiving terminal U2 correspondence is 10,7,5,1.Each receiving terminal all can be from code word V then
0Begin to adjudicate, obtain from pre-encoding codeword to be feedback in current period.
Specifically, with the historical schedule information of the historical dispatching record shown in the table 1, wherein preserve the schedule information in 3 cycles before the current period, i.e. n=3 as receiving terminal U1.For V
0, this code word appears in the historical dispatching record and is not successfully dispatched, and therefore need get rid of this code word with random chance thresholding 0.4.For example: produce an equally distributed stochastic variable r between [0,1] at random, suppose r=0.3, then this pre-encoding codeword is got rid of outside the candidate codewords formation.For V
1, this code word appears in the historical dispatching record and is not successfully dispatched, and supposes the random number r=0.5 of generation, then this code word is joined in the candidate codewords formation.For V
2, this code word appears in the historical dispatching record and is successfully dispatched, and therefore this code word is joined in the candidate codewords formation.For V
3, this pre-encoding codeword does not appear in the historical dispatching record, therefore this code word is joined in the candidate codewords formation.After all code words in the precoding code book being carried out judgement, obtain the candidate codewords formation and be { V
1, V
2, V
3.Since in three candidate codewords, code word V
1The CQI maximum, so this code word is chosen as the to be feedback pre-encoding codeword of receiving terminal U1 at current period.
At receiving terminal U2, suppose that the historical schedule information of this receiving terminal is as shown in table 2:
| Cycle | Codewords indexes | Scheduling result |
| -1 | 0 | Success |
| -2 | 3 | Success |
| -3 | 2 | Not success |
The historical dispatching record of table 2 receiving terminal U2
Adopt the feedback selection approach identical, can obtain the candidate codewords formation and be { V with receiving terminal U1
0, V
1, V
3.Because code word V
0The CQI maximum, therefore this code word is chosen as the to be feedback pre-encoding codeword of receiving terminal U2 at current period.
Because code word V
1And V
0Be arranged in same pre-coding matrix, therefore receiving terminal U1 and U2 can carry out message transmission simultaneously under the scheduling as the base station of transmitting terminal, and this moment, the transmittability of system was the CQI sum of the pre-encoding codeword correspondence to be feedback of two receiving terminal current periods, was 8+10=18.
If select the code word of CQI maximum according to the mode of prior art, the pre-encoding codeword to be feedback of the current period selected of receiving terminal U1 and U2 all is code word V so
0, be merely able to have a receiving terminal successfully to be dispatched this moment.That suppose to be allowed to the information of transmitting is receiving terminal U1, and the transmittability of system is 12 so.As seen, less than the system transmissions ability in the present embodiment.And two receiving terminals can carry out message transmission simultaneously in the present embodiment, and with respect to the existing situation that only has a receiving terminal to carry out message transmission, present embodiment can also be avoided the waste of resource.Thus, can draw present embodiment can avoid the wasting of resources effectively and improve systematic function.
In addition, even have only the feedback of receiving terminal U1 execution present embodiment to select, and receiving terminal U2 determines pre-encoding codeword V according to the mode of prior art
0, also can improve and match probability completely.
Embodiment 2
Make up historical dispatching record according to the form shown in the table 1 in the present embodiment, and selection principle is the channel quality principle.Here can weigh channel quality by Signal Interference and Noise Ratio (SINR), signal to noise ratio (snr) or CQI.Below when determining the candidate codewords formation according to SNR, be that example describes according to CQI when selecting the pre-encoding codeword to be feedback of current period.
Fig. 5 shows the flow chart of feedback system of selection in the present embodiment, and referring to Fig. 5, this method comprises:
In step 501, receiving terminal is carried out channel estimating, obtain the current C QI and the SNR of each code word correspondence in the precoding code book.
In step 502, with first code word in the precoding code book as current code word.
In step 503, judge whether current code word appears in the historical dispatching record, if then execution in step 504, otherwise, execution in step 506.
In step 504, judge whether interior receiving terminal of corresponding cycle of current code word is successfully dispatched, if then execution in step 506; Otherwise, execution in step 505.
In step 505, whether the SNR that judges current code word smaller or equal to the SNR thresholding that sets in advance, if then execution in step 506, otherwise, execution in step 507.
As a rule, the size of the SNR of different code word correspondences depends on the matching degree of this code word and channel response and this receiving terminal user's average signal-to-noise ratio in the precoding code book, for example large scale decline etc.For the higher receiving terminal of average signal-to-noise ratio, the corresponding SNR of those code words outside the optimum code word in the precoding code book corresponding with it can be very not low yet, therefore will join in the candidate codewords formation smaller or equal to the code word of SNR thresholding in this step, promptly allow the code word of receiving terminal feedback suboptimum, the perhaps code word of time suboptimum, the flexibility of bigger scheduling will be brought, thereby systematic function can be improved effectively.
Certainly, also can be in this step in SNR execution in step 506 during, execution in step 507 smaller or equal to the SNR thresholding time greater than the SNR thresholding.
In step 506, current code word is added in the candidate codewords formation.
Under following three kinds of situations, current code word is joined in the candidate codewords formation in the present embodiment: the first, current code word does not appear in the historical dispatching record; The second, current code word appears in the historical dispatching record and is successfully dispatched; The 3rd, current code word appears in the historical dispatching record and is not successfully dispatched, but is kept according to the SNR thresholding.
In step 507～509, judge whether current code word is last code word, if, then from the candidate codewords formation, select the to be feedback pre-encoding codeword of the code word of CQI maximum as current period, and process ends; Otherwise, turn to the next code word in the precoding code book, and return execution in step 503.
So far, the feedback that finishes in the present embodiment is selected flow process.
From above-mentioned flow process as seen, in the present embodiment from dwindling range of choice and preventing principles such as omission, the multiple situation that may occur has been carried out thorough consideration, make the code word that chooses to bring the complete success rate of higher pairing, can bring the good channel quality again, so that improve systematic function.
Present embodiment also can be carried out the operation that the pre-encoding codeword to be feedback that utilizes current period upgrades historical schedule information record after step 508 as embodiment 1.
Feedback device in the present embodiment can adopt the structure among Fig. 2, comprising: memory module, channel estimation module and code word are selected module.
Memory module in the present embodiment is preserved precoding code book, historical dispatching record, the SNR thresholding that sets in advance and the candidate codewords formation of place receiving terminal, and the difference of this module and Fig. 2 is the preservation that has increased code word, SNR thresholding and the candidate codewords formation of successfully not dispatched before the current period.
Channel estimation module reads code book from memory module, the place receiving terminal is carried out channel estimating, obtains the current C QI and the SNR of each code word correspondence in the precoding code book, and is transferred to code word selection module.
Code word is selected the current channel quality of module reception from each code word correspondence of channel estimation module, historical dispatching record and SNR thresholding from memory module, when the current code word that reads from memory module does not appear in the historical record or current code word appears in the historical dispatching record and receiving terminal is successfully dispatched in the corresponding cycle, this code word is joined in the candidate codewords formation; Appear in the historical record but when receiving terminal is not successfully dispatched in the corresponding cycle in current code word, determine whether current code word is joined in the candidate codewords formation according to the SNR and the SNR thresholding of this code word; And after finishing the determining of current period candidate codewords formation, from the candidate codewords formation, select the to be feedback pre-encoding codeword of the code word of CQI maximum as current period.
In addition, code word selects module also to utilize historical dispatching record in the pre-encoding codeword updated stored module to be feedback of current period.
Above-mentioned feedback selection flow process and feedback choice device are equally applicable at least one receiving terminal in the multi-user pre-coding system, and each receiving terminal can independently be carried out the feedback of self and select.In addition, if when definite candidate codewords formation, adopt SINR or CQI weigh channel only come can set in advance SINR thresholding or CQI thresholding.In the present embodiment SINR, SNR and CQI are commonly referred to as channel quality, the thresholding of correspondence is commonly referred to as channel quality thresholds.
With receiving terminal U1 among the embodiment 1 and the historical dispatching record in the table 1 is example, supposes that the SNR thresholding is 2.So, use present embodiment, the CQI that obtains four code words is 12,8,6,2, and SNR is respectively 5,1,10,4, then from code word V
0Begin to adjudicate, obtain the to be feedback pre-encoding codeword of this receiving terminal at current period.
Specifically, for V
0, this code word appears in the historical dispatching record and is not successfully dispatched, because the SNR of this code word is 5, greater than the SNR thresholding, then this pre-encoding codeword is got rid of outside the candidate codewords formation.For V
1, this code word appears in the historical dispatching record and is not successfully dispatched, because the SNR of this code word is 1, less than the SNR thresholding, therefore this code word is joined in the candidate codewords formation.For V
3, this pre-encoding codeword does not appear in the historical dispatching record, therefore this code word is joined in the candidate codewords formation.After all code words in the precoding code book being carried out judgement, obtain the candidate codewords formation and be { V
1, V
2, V
3.Since in three candidate codewords, code word V
1The CQI maximum, so this code word is chosen as the to be feedback pre-encoding codeword of receiving terminal U1 at current period.
Present embodiment can reduce the wasting of resources equally, and improves systematic function effectively.
Embodiment 3
Make up historical dispatching record according to the form shown in the table 1 in the present embodiment, and selection principle is PF priority principle.
Fig. 6 shows the flow chart of feedback system of selection in the present embodiment, and referring to Fig. 6, this method comprises:
In step 601, receiving terminal is carried out channel estimating, obtain the current C QI of each code word correspondence in the precoding code book, and calculate the PF priority of each code word.
Can utilize the Mean Speed and/or the parameters such as signal to noise ratio and/or capacity of receiving terminal according to the maturation method of prior art in the present embodiment, calculate the PF priority of each code word.
In step 602, with first code word in the precoding code book as current code word.
In step 603, judge whether current code word appears in the historical dispatching record, if then execution in step 604, otherwise, execution in step 606.
In step 604, judge whether interior receiving terminal of corresponding cycle of current code word is successfully dispatched, if then execution in step 606; Otherwise, execution in step 605.
In step 605, whether the PF priority of judging current code word smaller or equal to the priority threshold that sets in advance, if then execution in step 606, otherwise, execution in step 607.
Certainly, also can be in this step in PF priority execution in step 606 during greater than priority threshold, execution in step 607 smaller or equal to priority threshold the time.
In step 606, current code word is added in the candidate codewords formation.
Under following three kinds of situations, current code word is joined in the candidate codewords formation in the present embodiment: the first, current code word does not appear in the historical dispatching record; The second, current code word appears in the historical dispatching record and is successfully dispatched; The 3rd, current code word appears in the historical dispatching record and is not successfully dispatched, but is kept according to priority threshold.
In step 607～609, judge whether current code word is last code word, if, then from the candidate codewords formation, select the to be feedback pre-encoding codeword of the code word of CQI maximum as current period, and process ends; Otherwise, turn to the next code word in the precoding code book, and return execution in step 603.
So far, the feedback that finishes in the present embodiment is selected flow process.
From above-mentioned flow process as seen, in the present embodiment from dwindling range of choice and preventing principles such as omission, the multiple situation that may occur has been carried out thorough consideration, make the code word that chooses to bring the complete success rate of higher pairing, can bring the good channel quality again, so that improve systematic function.
Present embodiment also can be carried out the operation that the pre-encoding codeword to be feedback that utilizes current period upgrades historical schedule information record after step 608 as embodiment 1.
In addition,, can omit the calculating in the step 601, but between step 604 and step 605, increase calculating the PF priority of current code word in order to save the calculation times of PF priority.Owing to can judge directly that the code word that joins in the candidate codewords formation need not to calculate its PF priority, therefore this way has been simplified computational process, thereby reduces the processing intensity that feedback is selected.
Fig. 7 shows the structural representation of feedback device in the present embodiment.Referring to Fig. 7, this feedback device comprises: memory module, channel estimation module, PF priority computing module and code word are selected module.
Memory module in the present embodiment is preserved precoding code book, the historical dispatching record of place receiving terminal and the priority threshold that sets in advance, and the difference of this module and Fig. 2 is to have increased the code word that current period is not successfully dispatched before and the preservation of priority threshold.
Channel estimation module reads code book from memory module, the place receiving terminal is carried out channel estimating, obtains the current C QI of each code word correspondence in the precoding code book, and is transferred to code word selection module.
Code word is selected the current channel quality of module reception from each code word correspondence of channel estimation module, from memory module, read precoding code book, historical dispatching record and priority threshold, when current code word does not appear in the historical record or current code word appears in the historical dispatching record and receiving terminal is successfully dispatched in the corresponding cycle, this code word is joined in the candidate codewords formation; Appear in the historical record but when receiving terminal is not successfully dispatched in the corresponding cycle in current code word, determine whether current code word is joined in the candidate codewords formation according to PF priority and priority threshold from this code word of PF priority computing module; And after finishing the determining of current period candidate codewords formation, from the candidate codewords formation, select the to be feedback pre-encoding codeword of the code word of CQI maximum as current period.
When adopting the mode of calculating PF priority in step 601, the priority computing module calculates the PF priority of each code word, and is transferred to code word selection module; When adopting the mode of between step 604 and 605, calculating PF priority, this PF priority computing module is receiving after needs that code word selects module to send calculate the codeword information of PF priority, calculate the PF priority of current code word, and be transferred to code word selection module.
In addition, code word selects module also to utilize historical dispatching record in the pre-encoding codeword updated stored module to be feedback of current period.
Above-mentioned feedback selection flow process and feedback choice device are equally applicable at least one receiving terminal in the multi-user pre-coding system, and each receiving terminal can independently be carried out the feedback of self and select.
Be example with receiving terminal U1 among the embodiment 1 and the historical dispatching record in the table 1 still, the suppose priorities thresholding is 2.So, use present embodiment, the CQI that obtains four code words is 12,8,6,2, and PF priority is respectively 5,1,10,4, obtains the candidate codewords formation then and is { V
1, V
2, V
3.Since in three candidate codewords, code word V
1The CQI maximum, so this code word is chosen as the to be feedback pre-encoding codeword of receiving terminal U1 at current period.
Present embodiment can reduce the wasting of resources equally, and improves systematic function effectively.
Embodiment 4
In the present embodiment still the form according to table 1 make up historical dispatching record, and selection principle is that random chance is in conjunction with the channel quality principle.The implication of the channel quality here is identical with embodiment 2.Embodying channel quality, embody channel quality with CQI when selecting the pre-encoding codeword to be feedback of current period with SNR when determining the candidate codewords formation below is that example describes.
Fig. 8 shows the flow chart of feedback system of selection in the present embodiment, and referring to Fig. 8, this method comprises:
In step 801, receiving terminal is carried out channel estimating, obtain the current C QI and the SNR of each code word correspondence in the precoding code book.
In step 802, with first code word in the precoding code book as current code word.
In step 803, judge whether current code word appears in the historical dispatching record, if then execution in step 804, otherwise, execution in step 808.
In step 804, judge whether interior receiving terminal of corresponding cycle of current code word is successfully dispatched, if then execution in step 808; Otherwise, execution in step 805.
In step 805, whether the SNR that judges current code word smaller or equal to the SNR thresholding that sets in advance, if then execution in step 808, otherwise, execution in step 806.
Also can be in this step in SNR execution in step 808 during, execution in step 806 smaller or equal to the SNR thresholding time greater than the SNR thresholding.
In step 806～807, generate a random number, and judge that whether this random number is greater than the random chance thresholding that sets in advance, if then execution in step 808; Otherwise, execution in step 809.
In step 808, current code word is added in the candidate codewords formation.
Under following three kinds of situations, current code word is joined in the candidate codewords formation in the present embodiment: the first, current code word does not appear in the historical dispatching record; The second, current code word appears in the historical dispatching record and is successfully dispatched; The 3rd, current code word appears in the historical dispatching record and is not successfully dispatched, but is kept according to SNR thresholding and random chance thresholding.
And, from above-mentioned step 805～808 as seen, when current code word does not meet the SNR principle, it directly can not got rid of outside the candidate codewords formation, but decide this code word whether can join in the candidate codewords formation according to the random chance principle again.This operation is compared with 2 with embodiment 1, avoids the better effects if of omitting.
In step 809～811, judge whether current code word is last code word, if, then from the candidate codewords formation, select the to be feedback pre-encoding codeword of the code word of CQI maximum as current period, and process ends; Otherwise, turn to the next code word in the precoding code book, and return execution in step 803.
So far, the feedback that finishes in the present embodiment is selected flow process.
From above-mentioned flow process as seen, in the present embodiment from dwindling range of choice and better preventing principles such as omission, the multiple situation that may occur has been carried out thorough consideration, make the code word that chooses to bring the complete success rate of higher pairing, can bring the good channel quality again, so that improve systematic function.
Present embodiment also can be carried out the operation that the pre-encoding codeword to be feedback that utilizes current period upgrades historical schedule information record after step 810 as embodiment 1.
Feedback device in the present embodiment also can adopt the structure among Fig. 4, comprising: memory module, channel estimation module, code word are selected module and random number generation module.
Memory module in the present embodiment is preserved precoding code book, historical dispatching record, the SNR thresholding that sets in advance of place receiving terminal and the random chance thresholding that sets in advance.
Channel estimation module reads code book from memory module, the place receiving terminal is carried out channel estimating, obtains the current C QI and the SNR of each code word correspondence in the precoding code book, and is transferred to code word selection module.
Code word is selected the current channel quality of module reception from each code word correspondence of channel estimation module, from memory module, read precoding code book, historical dispatching record, SNR thresholding and random chance thresholding, when current code word does not appear in the historical record or current code word appears in the historical dispatching record and receiving terminal is successfully dispatched in the corresponding cycle, this code word is joined in the candidate codewords formation; Appear in the historical record but when receiving terminal is not successfully dispatched in the corresponding cycle in current code word, determine whether current code word is joined in the candidate codewords formation according to SNR and SNR thresholding, the random number that comes from the random number generation module and the random chance thresholding of this code word; And after finishing the determining of current period candidate codewords formation, from the candidate codewords formation, select the to be feedback pre-encoding codeword of the code word of CQI maximum as current period.The random number generation module generates random number under the notice of code word selection module, and sends to code word selection module.
In addition, code word selects module also to utilize historical dispatching record in the pre-encoding codeword updated stored module to be feedback of current period.
Above-mentioned feedback selection flow process and feedback choice device are equally applicable at least one receiving terminal in the multi-user pre-coding system, and each receiving terminal can independently be carried out the feedback of self and select.
In addition, above-mentioned SNR thresholding can be replaced with the SNR segment threshold, promptly [S1, S2 ..., Sn] etc. the channel quality thresholds of form; Correspondingly, each interval in the SNR segment threshold be all to there being the random chance of self, promptly this moment the random chance segment threshold be [0, R1, R2 ..., Rn].As the SNR of code word during less than S1, the corresponding random probability thresholding is 0, promptly necessarily is excluded outside candidate codewords; As the SNR of code word during more than or equal to S1 and less than S2, the corresponding random probability thresholding is R1; When the SNR of code word more than or equal to S2 and less than S3, the corresponding random probability thresholding is R2; The rest may be inferred, and as the SNR of code word during more than or equal to Sn, the corresponding random probability thresholding is Rn.
In this case, the step 805 in the present embodiment～807 can replace with: the SNR that determines current code word residing interval and should interval corresponding random probability thresholding in the SNR segment threshold; Generate a random number, whether judge this random number greater than determined random chance thresholding, if then execution in step 808, otherwise, execution in step 809.Here also can be in random number execution in step 808 during smaller or equal to determined random chance thresholding, and in random number execution in step 809 during greater than determined random chance thresholding.
Under the mode of this employing segment threshold, can determine to reflect the random chance thresholding of actual conditions for the SNR of different range, thereby make the definite more accurate of candidate codewords formation, with the complete probability of pairing of further raising pre-encoding codeword selection.
Embodiment 5
Present embodiment combines embodiment 1 and embodiment 3, and the selection principle of employing is that random chance is in conjunction with PF priority principle.
Fig. 9 shows the flow chart of feedback system of selection in the present embodiment, and referring to Fig. 9, this method comprises:
In step 901, receiving terminal is carried out channel estimating, obtain the current C QI of each code word correspondence in the precoding code book, and calculate the PF priority of each code word.
In step 902, with first code word in the precoding code book as current code word.
In step 903, judge whether current code word appears in the historical dispatching record, if then execution in step 904, otherwise, execution in step 908.
In step 904, judge whether interior receiving terminal of corresponding cycle of current code word is successfully dispatched, if then execution in step 908; Otherwise, execution in step 905.
In step 905, whether the PF priority of judging current code word smaller or equal to the priority threshold that sets in advance, if then execution in step 908, otherwise, execution in step 906.
Certainly, also can be in this step in PF priority execution in step 908 during greater than priority threshold, execution in step 906 smaller or equal to priority threshold the time.
In step 906～907, generate a random number, and judge that whether this random number is greater than the random chance thresholding that sets in advance, if then execution in step 908; Otherwise, execution in step 909.
In step 908, current code word is added in the candidate codewords formation.
Under following three kinds of situations, current code word is joined in the candidate codewords formation in the present embodiment: the first, current code word does not appear in the historical dispatching record; The second, current code word appears in the historical dispatching record and is successfully dispatched; The 3rd, current code word appears in the historical dispatching record and is not successfully dispatched, but is kept according to priority threshold and random chance thresholding.
In step 909～911, judge whether current code word is last code word, if, then from the candidate codewords formation, select the to be feedback pre-encoding codeword of the code word of CQI maximum as current period, and process ends; Otherwise, turn to the next code word in the precoding code book, and return execution in step 903.
So far, the feedback that finishes in the present embodiment is selected flow process.
From above-mentioned flow process as seen, in the present embodiment from dwindling range of choice and preventing principles such as omission, the multiple situation that may occur has been carried out thorough consideration, make the code word that chooses to bring the complete success rate of higher pairing, can bring the good channel quality again, so that improve systematic function.
Present embodiment also can be carried out the operation that the pre-encoding codeword to be feedback that utilizes current period upgrades historical schedule information record after step 910 as embodiment 1.
Equally, present embodiment can in order to save the calculation times of PF priority, omit the calculating in the step 901, but increase the calculating to the PF priority of current code word between step 904 and step 905 as embodiment 3.This way has been simplified computational process, thereby reduces the processing intensity that feedback is selected.
Figure 10 shows the structural representation of feedback device in the present embodiment.Referring to Figure 10, this feedback device comprises: memory module, channel estimation module, PF priority computing module, random number generation module and code word are selected module.
Memory module in the present embodiment is preserved precoding code book, historical dispatching record, the priority threshold that sets in advance of place receiving terminal and the random chance thresholding that sets in advance.
Channel estimation module reads code book from memory module, the place receiving terminal is carried out channel estimating, obtains the current C QI of each code word correspondence in the precoding code book, and is transferred to code word selection module.
Code word is selected the current channel quality of module reception from each code word correspondence of channel estimation module, from memory module, read precoding code book, historical dispatching record, priority threshold and random chance thresholding, when current code word does not appear in the historical record or current code word appears in the historical dispatching record and receiving terminal is successfully dispatched in the corresponding cycle, this code word is joined in the candidate codewords formation; Appear in the historical record in current code word but when receiving terminal is not successfully dispatched in the corresponding cycle, determine whether current code word is joined in the candidate codewords formation according to PF priority and priority threshold, the random number that comes from the random number generation module and random chance thresholding from the priority computing module; And after finishing the determining of current period candidate codewords formation, from the candidate codewords formation, select the to be feedback pre-encoding codeword of the code word of CQI maximum as current period.
When adopting the mode of calculating PF priority in step 901, the priority computing module calculates the PF priority of each code word, and is transferred to code word selection module; When adopting the mode of calculating PF priority between step 904 and 905, this priority computing module calculates the PF priority of current code word under the indication of code word selection module, and is transferred to code word selection module.
The random number generation module generates random number under the notice of code word selection module, and sends to code word selection module.
In addition, code word selects module also to utilize historical dispatching record in the pre-encoding codeword updated stored module to be feedback of current period.
Above-mentioned feedback selection flow process and feedback choice device are equally applicable at least one receiving terminal in the multi-user pre-coding system, and each receiving terminal can independently be carried out the feedback of self and select.
In addition, above-mentioned PF priority threshold can be replaced with the priority segment threshold, promptly [P1, P2 ..., Pn] etc. the channel quality thresholds of form; Correspondingly, each interval in the priority threshold be all to there being the random chance of self, promptly this moment the random chance segment threshold be [0, R1, R2 ..., Rn].When the PF of code word priority during less than P1, the corresponding random probability thresholding is 0, promptly necessarily is excluded outside candidate codewords; When the PF of code word priority during more than or equal to P1 and less than P2, the corresponding random probability thresholding is R1; When the PF of code word priority more than or equal to P2 and less than P3, the corresponding random probability thresholding is R2; The rest may be inferred, and when the PF of code word priority during more than or equal to Pn, the corresponding random probability thresholding is Rn.
In this case, the step 905 in the present embodiment～907 can replace with: the PF priority of determining current code word residing interval and should interval corresponding random probability thresholding in the priority segment threshold; Generate a random number, whether judge this random number greater than determined random chance thresholding, if then execution in step 908, otherwise, execution in step 909.Here also can be in random number execution in step 908 during smaller or equal to determined random chance thresholding, and in random number execution in step 909 during greater than determined random chance thresholding.
Under the mode of this employing segment threshold, can determine to reflect the random chance thresholding of actual conditions for the PF priority of different range, thereby make the definite more accurate of candidate codewords formation, with the complete probability of pairing of further raising pre-encoding codeword selection.
Embodiment 6
The foregoing description 1 to 5 is selected for the feedback of carrying out under the whole code word modes in the poll code book, adopts the mode of the full detail in the historical dispatching record of poll to feed back selection in the present embodiment.
Figure 11 shows the flow chart of feedback system of selection under the historical dispatching record mode of poll, and referring to Figure 11, this method comprises:
In 1101, receiving terminal is carried out channel estimating, obtain the current C QI of each code word correspondence in the precoding code book.
In step 1102, with first code word in the precoding code book as current code word.
In step 1103～1104, judge whether interior receiving terminal of corresponding cycle of current code word is successfully dispatched, if then execution in step 1106; Otherwise generate a random number that is positioned between the interval [0,1], and execution in step 1105.
In step 1105, whether judge the random number that is generated greater than the random chance thresholding that sets in advance, if then execution in step 1106, otherwise, execution in step 1107.
Also can be in this step in random number execution in step 1106 during, execution in step 1107 greater than the random chance thresholding time smaller or equal to the random chance thresholding.
In step 1106, current code word is added in the candidate codewords formation.
In step 1107～1110, judge that whether current code word place record is the last item record in the historical dispatching record, if, the code word that then will not appear in this history dispatching record adds in the candidate codewords formation, and from the candidate codewords formation, select the to be feedback pre-encoding codeword of the code word of CQI maximum as current period, process ends; Otherwise, turn to next bar record, and return execution in step 1103.
So far, the feedback that finishes in the present embodiment is selected flow process.
The mode of the historical dispatching record of present embodiment poll can also be applied to adopt channel quality principle, PF priority principle, random chance in conjunction with channel quality principle and PF priority in conjunction with under the situations such as channel quality principle.At this moment, judge whether current code word appears at the operation in the historical dispatching record in omission the foregoing description 2 to 5; To replace with the code word in first record in the historical dispatching record as current code word as preceding code word with first code word of morals in the precoding code book; To judge that whether current code word is last code word in the precoding code book and turns to next code word to replace with to judge whether current code word place record is the last item record in the historical dispatching record and turns to next bar record, and after turning to next bar record, return to carry out and judge the operation whether current code word is successfully dispatched; In addition, also after judging the current code word place and being recorded as the last item record in the historical dispatching record, increase will not appear at code word in the historical dispatching record and will add operation in the candidate codewords formation.
The feedback device of the historical dispatching record mode of employing present embodiment poll can be identical with the structure of Fig. 2, Fig. 4, Fig. 7 or Figure 10.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (28)
1, the feedback system of selection in a kind of multi-user pre-coding system is characterized in that, this method comprises:
Receiving terminal is carried out channel estimating, obtain the current channel quality of each code word correspondence in the precoding code book;
Determine the code word that current period was successfully dispatched before, select corresponding current channel quality soprano, as the pre-encoding codeword current to be feedback of this receiving terminal.
2, the method for claim 1 is characterized in that, the described selection further comprises before the corresponding current channel quality soprano:
Determine successfully not dispatched before the current period but meet the code word of the selection principle that sets in advance.
3, method as claimed in claim 2 is characterized in that, is not successfully dispatched before described definite current period but the code word that meets the selection principle that sets in advance is:
For each code word of successfully not dispatched before the current period generates random number corresponding, when the random number that is generated is less than or equal to the random chance thresholding that sets in advance, the code word of this random number correspondence is defined as successfully not dispatched before the described current period but meets the code word of the selection principle that sets in advance.
4, method as claimed in claim 2 is characterized in that, is not successfully dispatched before described definite current period but the code word that meets the selection principle that sets in advance is:
For each code word of successfully not dispatched before the current period generates random number corresponding, when judging the random number generated, the code word of this random number correspondence is defined as successfully not dispatched before the described current period but meets the code word of the selection principle that sets in advance greater than the random chance thresholding that sets in advance.
5, method as claimed in claim 2 is characterized in that, is not successfully dispatched before described definite current period but the code word that meets the selection principle that sets in advance is:
When the code word corresponding channel quality of successfully not dispatched is less than or equal to the channel quality thresholds that sets in advance, this code word is defined as that described current period is not successfully dispatched before but the code word that meets the selection principle that sets in advance before judging current period.
6, method as claimed in claim 2 is characterized in that, is not successfully dispatched before described definite current period but the code word that meets the selection principle that sets in advance is:
The code word corresponding channel quality of successfully not dispatched before judging current period is during greater than the channel quality thresholds that sets in advance, and this code word is defined as that described current period is not successfully dispatched before but the code word that meets the selection principle that sets in advance.
7, method as claimed in claim 2, it is characterized in that, described definite current period is not successfully dispatched before but is met before the code word of the selection principle that sets in advance, and further comprises: the equitable proportion PF priority of calculating the code word correspondence of successfully not dispatched before the current period;
The code word of successfully not dispatched before described definite current period but meeting the selection principle that sets in advance is: the PF priority of the code word correspondence of successfully not dispatched before judging current period is during less than the priority threshold that sets in advance, and this code word is defined as that described current period is not successfully dispatched before but the code word that meets the selection principle that sets in advance.
8, method as claimed in claim 2, it is characterized in that, described definite current period is not successfully dispatched before but is met before the code word of the selection principle that sets in advance, and further comprises: the equitable proportion PF priority of calculating the code word correspondence of successfully not dispatched before the current period;
The code word of successfully not dispatched before described definite current period but meeting the selection principle that sets in advance is: the PF priority of the code word correspondence of successfully not dispatched before judging current period is during more than or equal to the priority threshold that sets in advance, and this code word is defined as that described current period is not successfully dispatched before but the code word that meets the selection principle that sets in advance.
9, as any described method in the claim 5 to 8, it is characterized in that, after the described judgement, further comprise:
Each code word generation random number corresponding for the result of determination correspondence, in described random number during, carry out describedly this code word is defined as successfully not dispatched before the described current period but meets the code word of the selection principle that sets in advance greater than the random chance thresholding that sets in advance.
10, as any described method in the claim 5 to 8, it is characterized in that, after the described judgement, further comprise:
Each code word generation random number corresponding for the result of determination correspondence, when described random number is less than or equal to the random chance thresholding that sets in advance, carry out describedly this code word is defined as successfully not dispatched before the described current period but meets the code word of the selection principle that sets in advance.
11, method as claimed in claim 2, it is characterized in that, each the interval corresponding random probability thresholding that sets in advance the channel quality segment threshold and form by segment threshold, successfully do not dispatched before described definite current period but the code word that meets the selection principle that sets in advance is:
Determine the residing interval of code word corresponding channel quality that current period is not successfully dispatched before, for this code word generates random number, when judging that the random number generated is less than or equal to this interval corresponding random probability thresholding, the code word of this random number correspondence is defined as successfully not dispatched before the described current period but meets the code word of the selection principle that sets in advance.
12, method as claimed in claim 2, it is characterized in that, each the interval corresponding random probability thresholding that sets in advance the channel quality segment threshold and form by segment threshold, successfully do not dispatched before described definite current period but the code word that meets the selection principle that sets in advance is:
Determine the residing interval of code word corresponding channel quality that current period is not successfully dispatched before, for this code word generates random number, when judging the random number generated, the code word of this random number correspondence is defined as successfully not dispatched before the described current period but meets the code word of the selection principle that sets in advance greater than this interval corresponding random probability thresholding.
13, method as claimed in claim 2 is characterized in that, each the interval corresponding random probability thresholding that sets in advance the priority segment threshold and formed by segment threshold;
Described definite current period is not successfully dispatched before but is met before the code word of the selection principle that sets in advance, and further comprises: the PF priority of calculating the code word correspondence of successfully not dispatched before the current period;
The code word of successfully not dispatched before described definite current period but meeting the selection principle that sets in advance is: the residing interval of PF priority of determining the code word correspondence of successfully not dispatched before the current period, for this code word generates random number, when judging the random number generated, the code word of this random number correspondence is defined as successfully not dispatched before the described current period but meets the code word of the selection principle that sets in advance less than this interval corresponding random probability thresholding.
14, method as claimed in claim 2 is characterized in that, each the interval corresponding random probability thresholding that sets in advance the priority segment threshold and formed by segment threshold;
Described definite current period is not successfully dispatched before but is met before the code word of the selection principle that sets in advance, and further comprises: the PF priority of calculating the code word correspondence of successfully not dispatched before the current period;
The code word of successfully not dispatched before described definite current period but meeting the selection principle that sets in advance is: the residing interval of PF priority of determining the code word correspondence of successfully not dispatched before the current period, for this code word generates random number, when judging that the random number generated is greater than or equal to this interval corresponding random probability thresholding, the code word of this random number correspondence is defined as successfully not dispatched before the described current period but meets the code word of the selection principle that sets in advance.
15, method as claimed in claim 2, it is characterized in that, the described selection before the corresponding current channel quality soprano, further comprise: according to successfully not dispatched before code word of successfully being dispatched before the described current period and the current period but meet the code word of described selection principle, form the candidate codewords formation;
The corresponding current channel quality soprano of described selection is: select the highest code word of current channel quality from the candidate codewords formation.
16, method as claimed in claim 15 is characterized in that, sets up historical dispatching record in advance, preserves codeword information and corresponding schedule information that current period used at least one cycle before;
The described selection from the candidate codewords formation further comprises: the code word that does not appear in the precoding code book in the described historical dispatching record is joined in the described candidate codewords formation before the highest code word of current channel quality.
17, method as claimed in claim 16 is characterized in that, this method further comprises: utilize described current pre-encoding codeword to be feedback to upgrade historical dispatching record.
18, the feedback choice device in a kind of multi-user pre-coding system is characterized in that, this device comprises: memory module, channel estimation module and code word are selected module, wherein,
Described memory module is preserved the precoding code book of place receiving terminal and the code word that current period was successfully dispatched before;
Described channel estimation module reads precoding code book from described memory module, the place receiving terminal is carried out channel estimating, obtains the current channel quality of each code word correspondence in the precoding code book;
Described code word is selected the current channel quality of module reception from each code word correspondence of channel estimation module, from memory module, read code word, from the code word that reads, select corresponding current channel quality soprano, as the pre-encoding codeword current to be feedback of this receiving terminal.
19, device as claimed in claim 18 is characterized in that, this device further comprises: the random number generation module is used for generating random number under the notice of described code word selection module, and the random number that is generated is sent to code word selection module;
Described memory module is further preserved code word, candidate codewords formation of successfully not dispatched before the current period and the random chance thresholding that sets in advance;
Described code word selects module further to read the random chance thresholding from described memory module, if the code word that reads was successfully dispatched before current period, this code word is joined in the candidate codewords formation; If the code word that reads was not successfully dispatched before current period, notice random number generation module generates random number, reception comes from the random number of random number generation module, when this random number meets the random chance threshold requirement this code word is joined in the candidate codewords formation; And after finishing the determining of current period candidate codewords formation, from the candidate codewords formation, select the highest code word of described channel quality as current pre-encoding codeword to be feedback.
20, device as claimed in claim 18 is characterized in that, described memory module is further preserved code word, candidate codewords formation of successfully not dispatched before the current period and the channel quality thresholds that sets in advance;
Described code word selects module further to read channel quality thresholds from memory module, if the code word that reads was successfully dispatched before current period, this code word is joined in the candidate codewords formation; If the code word that reads was not successfully dispatched before current period, when this code word corresponding channel quality meets the channel quality thresholds requirement that reads, this code word is joined in the candidate codewords formation; And after finishing the determining of current period candidate codewords formation, from the candidate codewords formation, select the highest code word of described channel quality as current pre-encoding codeword to be feedback.
21, device as claimed in claim 20 is characterized in that, this device further comprises: the random number generation module is used for generating random number under the notice of described code word selection module, and the random number that is generated is sent to code word selection module;
Described memory module is further preserved the random chance thresholding that sets in advance;
Described code word selects module further when this code word corresponding channel quality does not meet the channel quality thresholds requirement that reads, notify described random number generation module to generate random number, reception comes from the random number of random number generation module, when this random number meets the random chance threshold requirement this code word is joined in the candidate codewords formation.
22, device as claimed in claim 18 is characterized in that, this device further comprises: equitable proportion PF priority computing module is used for the PF priority of compute codeword, and is transferred to code word selection module;
Described memory module is further preserved code word, candidate codewords formation of successfully not dispatched before the current period and the priority threshold that sets in advance;
Described code word selects module further to read priority threshold from memory module, if the code word that reads was successfully dispatched before current period, this code word is joined in the candidate codewords formation; If the code word that reads was not successfully dispatched before current period, when the PF priority of this code word that comes from PF priority computing module meets the priority threshold requirement that reads, this code word is joined in the candidate codewords formation; And after finishing the determining of current period candidate codewords formation, from the candidate codewords formation, select the highest code word of described channel quality as current pre-encoding codeword to be feedback.
23, device as claimed in claim 22 is characterized in that, described code word selects module further to notify described PF priority block need calculate the codeword information of PF priority.
24, as claim 22 or 23 described devices, it is characterized in that this device further comprises: the random number generation module is used for generating random number under the notice of described code word selection module, and the random number that is generated is sent to code word selection module;
Described memory module is further preserved the random chance thresholding that sets in advance;
Described code word selects module further when the PF of this code word priority does not meet the priority threshold requirement that reads, notify described random number generation module to generate random number, reception comes from the random number of random number generation module, when this random number meets the random chance threshold requirement this code word is joined in the candidate codewords formation.
25, device as claimed in claim 18 is characterized in that, this device further comprises: the random number generation module is used for generating random number under the notice of described code word selection module, and the random number that is generated is sent to code word selection module;
Each interval corresponding random probability thresholding that described memory module is further preserved code word, the candidate codewords formation of successfully not dispatched before the current period and the channel quality segment threshold that sets in advance and formed by segment threshold;
Each interval corresponding random probability thresholding that described code word selects module further to read the channel quality segment threshold and formed by segment threshold from memory module, if the code word that reads was successfully dispatched before current period, this code word is joined in the candidate codewords formation; If the code word that reads was not successfully dispatched before current period, determine the residing interval of code word corresponding channel quality that current period is not successfully dispatched before, notify described random number generation module to generate random number for this code word, when judging that the random number generated meets this interval corresponding random probability threshold requirement, this code word is joined in the candidate codewords formation; And after finishing the determining of current period candidate codewords formation, from the candidate codewords formation, select the highest code word of described channel quality as current pre-encoding codeword to be feedback.
26, device as claimed in claim 18, it is characterized in that, this device further comprises: PF priority computing module and random number generation module, the PF priority of described PF priority computing module compute codeword, and be transferred to code word and select module, described random number generation module generates random number under the notice of described code word selection module, and the random number that is generated is sent to code word selection module;
Each interval corresponding random probability thresholding that described memory module is further preserved code word, the candidate codewords formation of successfully not dispatched before the current period and the priority segment threshold that sets in advance and formed by segment threshold;
Each interval corresponding random probability thresholding that described code word selects module further to read the priority segment threshold and formed by segment threshold from memory module; If the code word that reads was successfully dispatched before current period, this code word is joined in the candidate codewords formation; If the code word that reads was not successfully dispatched before current period, determine to come from the residing interval of PF priority of this code word of PF priority computing module, notify described random number generation module to generate random number for this code word, when judging that the random number generated meets this interval corresponding random probability threshold requirement, this code word is joined in the candidate codewords formation; And after finishing the determining of current period candidate codewords formation, from the candidate codewords formation, select the highest code word of described channel quality as current pre-encoding codeword to be feedback.
27, as any described device in the claim 19 to 23,25,26, it is characterized in that, comprise historical dispatching record in the described memory module, preserve the code word of successfully not dispatched before the code word of successfully being dispatched before the described current period and the current period;
Described code word selects module further to utilize described current pre-encoding codeword to be feedback to upgrade described historical dispatching record.
28, device as claimed in claim 27 is characterized in that, described code word selects module further will appear in the precoding code book but the code word that does not appear in the described historical dispatching record joins in the candidate codewords formation.
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| CNA2007101517231A CN101399590A (en) | 2007-09-27 | 2007-09-27 | Feedback selection method and device in multi-user pre-coding system |
| JP2008247418A JP2009089381A (en) | 2007-09-27 | 2008-09-26 | Method and apparatus for feedback selection in multi-user precoding system |
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| CNA2007101517231A CN101399590A (en) | 2007-09-27 | 2007-09-27 | Feedback selection method and device in multi-user pre-coding system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010118650A1 (en) * | 2009-04-17 | 2010-10-21 | 华为技术有限公司 | Channel information feedback method, terminal, base station, and multiple input multiple output (mimo) system |
| CN102098217A (en) * | 2011-01-14 | 2011-06-15 | 中国科学技术大学 | Probability-based multipriority queue scheduling method |
| WO2013113166A1 (en) * | 2012-02-03 | 2013-08-08 | Telefonaktiebolaget L M Ericsson (Publ) | User equipment, radio base station and respective methods therein for joint transmitting and receiving procedure |
| CN110120829A (en) * | 2018-02-06 | 2019-08-13 | 中兴通讯股份有限公司 | Poewr control method, equipment and storage medium |
| CN111192577A (en) * | 2018-10-25 | 2020-05-22 | 丰田自动车株式会社 | AC device and control program for AC device |
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| CN102244567A (en) * | 2010-05-13 | 2011-11-16 | 清华大学 | Communication control server, base station, terminal and joint service system and method |
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2007
- 2007-09-27 CN CNA2007101517231A patent/CN101399590A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010118650A1 (en) * | 2009-04-17 | 2010-10-21 | 华为技术有限公司 | Channel information feedback method, terminal, base station, and multiple input multiple output (mimo) system |
| US8320275B2 (en) | 2009-04-17 | 2012-11-27 | Huawei Technologies Co., Ltd. | Channel information feedback method, mobile station, base station, multi-input multi-output system |
| CN101867464B (en) * | 2009-04-17 | 2012-12-12 | 华为技术有限公司 | Channel information feedback method, terminal, base station and multiple input multiple output system |
| CN102098217A (en) * | 2011-01-14 | 2011-06-15 | 中国科学技术大学 | Probability-based multipriority queue scheduling method |
| CN102098217B (en) * | 2011-01-14 | 2013-08-07 | 中国科学技术大学 | Probability-based multipriority queue scheduling method |
| WO2013113166A1 (en) * | 2012-02-03 | 2013-08-08 | Telefonaktiebolaget L M Ericsson (Publ) | User equipment, radio base station and respective methods therein for joint transmitting and receiving procedure |
| WO2013115697A3 (en) * | 2012-02-03 | 2013-11-14 | Telefonaktiebolaget L M Ericsson (Publ) | Joint transmit and receive procedure |
| US9706548B2 (en) | 2012-02-03 | 2017-07-11 | Telefonaktiebolaget Lm Ericsson (Publ) | Joint transmit and receive procedure |
| CN110120829A (en) * | 2018-02-06 | 2019-08-13 | 中兴通讯股份有限公司 | Poewr control method, equipment and storage medium |
| CN110120829B (en) * | 2018-02-06 | 2021-06-18 | 中兴通讯股份有限公司 | Power control method, device and storage medium |
| CN111192577A (en) * | 2018-10-25 | 2020-05-22 | 丰田自动车株式会社 | AC device and control program for AC device |
| CN111192577B (en) * | 2018-10-25 | 2023-10-13 | 丰田自动车株式会社 | AC device and control program for AC device |
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