CN1841961A - Method and apparatus for selecting transmitting antenna in multi antenna wireless communication system - Google Patents
Method and apparatus for selecting transmitting antenna in multi antenna wireless communication system Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
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- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
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- H04L25/0204—Channel estimation of multiple channels
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- H—ELECTRICITY
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- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
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Abstract
The invention discloses a method for choosing sending the antenna in a multi-antenna input and output wireless system, which comprises the following steps: the receiving part dose channel estimation by the sent training sequence to obtain all the possible channel array H_e, and feedbacks the H_e to the sending part; it chooses K sending antennas from M sending antennas and first chooses I antennas, wherein I, M, K are natural number and K<M; if the rate of the corresponding condition number of the channel array of the chosen sending antenna and the candidate channel array condition is less than the pre-set threshold quantity alpha, it chooses the new chosen channel array as the candidate channel array and ascertains the chosen sending antenna as the sending antenna.
Description
Technical field
The present invention relates to a kind of method and apparatus of in many antennas input and output wireless communication system, selecting transmitting antenna.Particularly relate to the method and apparatus of selecting transmitting antenna based on the input of many antennas of linearity input and output (MIMO) detector, thereby optimize the detector false code check.
Background technology
Many antennas input and output (MIMO) technology is the important breakthrough of wireless mobile communications art.The MIMO technology is meant the transmission of data and receives and all adopted many antennas.Studies show that utilize the MIMO technology can improve the capacity of channel, the while also can be improved the reliability of channel, reduces the error rate.The heap(ed) capacity of mimo system or maximum size be linear increasing with the increase of minimum antenna number.And under similarity condition, adopting the common antenna system of many antennas or aerial array at receiving terminal or transmitting terminal, its capacity only increases with the logarithm of antenna number.Comparatively speaking, the MIMO technology has great potentiality for the capacity that improves wireless communication system, is the key technology that the third generation mobile communication system adopts.
Figure 1 shows that the mimo system structural representation of common employing.In this structure, transmitting terminal and receiving terminal adopt n respectively
TAnd n
RIndividual antenna carries out the transmission and the reception of signal.Transmitting terminal comprises serial/parallel converter unit 101 and a plurality of transmitting antenna 102.Receiving terminal comprises a plurality of reception antennas 103, channel estimating unit 104 and detector 105.For simplicity, only show among Fig. 1 and the part that is used to illustrate that its operation is relevant.
At transmitting terminal, data to be sent at first are divided into n through serial/parallel converter unit 101
TIndividual data flow, the corresponding transmitting antenna of each data flow.At receiving terminal, at first by n
RIndividual reception antenna 103 receives signal, carries out channel estimating by channel estimating unit 104 according to this received signal then, estimates current characteristic of channel matrix H.MIMO detection module 105 utilizes this characteristic of channel matrix H to detect to received signal, demodulates the information bit of making a start and sending.
For the selection of antenna, because equipment such as radio frequency are expensive, along with the increase of MIMO number of antennas, price also increases at any time, and the complexity of processing also increases thereupon.So, occurred based on the method for the sky line options of mimo system.In M antenna, only select local channel antenna preferably, so just can reduce the quantity of equipment such as radio frequency, and reduce the complexity of handling.At present, the method for day line options mainly is based on maximum capacity, mainly contains following several method:
1. based on the traversal method of maximum capacity
Suppose in M root antenna, to select K then total C
M KPlant the method for selecting, this kind method travels through this C according to capacity formula
M KPlant and select, select the H of a capacity maximum then.
2. based on the maximum capacity method of matrix reduction
The complexity of calculating based on the traversal method of maximum capacity is very high, so Gorokhov has proposed a kind of system of selection of progressively eliminating (such as select K from M root antenna).This method is according to the principle of matrix computations, and one by one minimizing from M is selected is till remaining K antenna only.The criterion of its deletion is the minimum that is reduced to of capacity.
3. based on the system of selection of norm
K norm maximum of selection from the M of the channel matrix row (or row), the pairing antenna of selected channel is selected antenna.Compare with preceding two kinds of methods, this method is the simplest but performance is also the poorest.
Summary of the invention
In view of the defective in the above-mentioned antenna selecting method, the purpose of this invention is to provide a kind of antenna selecting method and device of linear MIMO detector arrangement, can improve the performance optimization detector false code check of detector.
In order to realize purpose of the present invention, according to an aspect of the present invention, the method of selecting transmitting antenna in a kind of many antennas input and output wireless communication system is provided, comprise step: the recipient carries out channel estimating according to the training sequence that sends and obtains all possible channel matrix H _ e, and regularly H_e is fed back to transmit leg; Channel matrix H _ e according to feedback selects K transmitting antenna from the transmitting antenna that adds up to M, and at first select I root antenna, I wherein, and M and K are natural numbers, and K is less than M; If the pairing conditional number of channel matrix of the new transmitting antenna of selecting and the ratio of candidate channel matrix conditional number are less than predetermined threshold α, then select the channel matrix of the new channel matrix of selecting, and determine that selected transmitting antenna is as transmitting antenna as the candidate.
According to another aspect of the present invention, the device of selecting transmitting antenna in a kind of many antennas input and output wireless communication system is provided, comprise: channel estimating apparatus is used for estimating all possible channel matrix H _ e according to the training sequence of transmit leg, and regularly H_e is fed back to transmit leg; Antenna selection apparatus is identified for sending the transmitting antenna of data according to the channel matrix H _ e of feedback; Data processing equipment is used for data are changed, coding and demodulation, and by the treated data of selected transmitting antenna transmission; The decision-feedback checkout gear is used for recovering the data that transmit leg sends from the channel estimating apparatus estimated result.
For the general linear detector, the conditional number of its channel matrix is more little, and performance is good more.The norm of each row of channel matrix has been represented the size at the resulting transmitting terminal energy of receiving terminal, and in general, its value is big more, and performance is good more.The method according to this invention has been considered these two factors of conditional number and norm when the sky line options, improve error performance in the mimo system.
Description of drawings
By below in conjunction with description of drawings the preferred embodiments of the present invention, will make above-mentioned and other purpose of the present invention, feature and advantage clearer, wherein:
Fig. 1 is the structural representation of the mimo system of routine;
Fig. 2 is the block diagram according to an example of the mimo system of selecting based on transmitting antenna of the present invention;
Fig. 3 is the flow chart according to the transmitting antenna selection course based on linear detector of the present invention;
Fig. 4 is the method according to this invention, and when detector was ZF, the performance of different systems of selection is the schematic diagram of (16-QAM) relatively; With
Fig. 5 be according to the present invention when detector be grid when reducing (LR) detector, the performance of different systems of selection is the schematic diagram of (16-QAM) relatively.
Embodiment
With reference to the accompanying drawings embodiments of the invention are described in detail, having omitted in the description process is unnecessary details and function for the present invention, obscures to prevent that the understanding of the present invention from causing.
Fig. 2 is the block diagram according to an example of the mimo system of selecting based on transmitting antenna of the present invention.As shown in Figure 2, according to this example, the mimo system of selecting based on transmitting antenna of the present invention comprises transmit leg and recipient.For simplicity, only describe and day relevant part of line options at this.Transmit leg comprises data processing unit 201, antenna selected cell 204, a plurality of transmitting antennas 205.The recipient comprises a plurality of reception antennas, channel estimating unit 202 and decision-feedback detecting unit 206.Data processing unit 201 comprises and data is carried out serial/parallel processing, processing units such as coding, modulation.
The following describes the operation of the mimo system of selecting based on transmitting antenna.At first, recipient's channel estimating unit 202 obtains all possible channel matrix H _ e according to the training sequence of transmit leg, and regularly H_e is fed back to the antenna selected cell 204 of transmit leg by feedback channel 203.Channel matrix H _ e that antenna selected cell 204 comes according to feedback determines the antenna of transmission.Then, at transmit leg, obtain data, and data are sent by antenna 205 from data processing unit 201.The recipient detects by decision-feedback detecting unit 206 after receiving the data of transmit leg transmission.
The process of selecting based on the transmitting antenna of linear detector according to of the present invention is described below in conjunction with Fig. 3.
Suppose that the fixed number of reception antenna is N (N is a natural number), total transmitting antenna number is M (M is a natural number), select K antenna as transmitting antenna (conditional number is defined as the ratio of matrix maximum singular value and minimum singular value) from M transmitting antenna.
At first, at step S301, transmit leg obtains total channel matrix H _ e according to the recipient to the feedback of channel estimating, and the number of antennas K that obtains sending, and sets thresholding α.Initialization I=1 (promptly selecting first antenna), and initialization H is empty set and makes Hs_e=H_e that what wherein Hs_e represented is the pairing channel matrix of candidate's antenna.The pairing channel of each candidate's antenna is shown in each tabulation of Hs_e.For example, the fixed amount of reception antenna is N=2, and total number of transmit antennas is M=4, therefrom select K=2 as transmitting antenna.Suppose α=0.9.Then have:
H_e＝
-0.6545+0.2830i 0.0174+0.1978i -0.4687+0.5468i -0.1779-0.0918i
-0.0758+0.3787i -0.3209+0.7723i 0.2373+0.1131i 0.1379-0.3496
Next,, whether judge I smaller or equal to K at step S302, if I＞K then show and selected required number of transmit antennas, flow process forwards step S312 to, the channel matrix H that output is selected, with the corresponding transmitting antenna of H.Otherwise enter step S303.In this example, at this moment, I=1 (K=2), I＜K, flow process forwards step S303 to.At step S303, calculate the columns C (equaling the quantity M of all transmitting antennas) of Hs_e, and initialization J=1 (J is illustrated in and selects in the I root sky line process, the J time counting in M-I+1 selects, 1＜=J＜=M-I+1), the minimum value con_min=∞ of conditional number, and initialization Hc make that Hc is that (Hc adds the J row of candidate's antenna channel matrix H s_e to the channel matrix selected first row that add Hs_e for the pairing channel matrix of having selected of antenna.Concerning fixing I, a total possible Hc of M-I+1 kind in the possible Hc of this M-I+1, selects best one, simultaneously, has also just determined transmitting antenna.Hc=[H Hs_e (:, 1)] (Hs_e (:, 1) represent that first of Hs_e is listed as).In this example, at this moment, for example, C=4, H are that (I=1 J=1), then first of Hc=Hs_e is listed as sky
Hc＝
-0.6545+0.2830i
-0.0758+0.3787i
Hs_e＝H_e＝
-0.6545+0.2830i 0.0174+0.1978i -0.4687+0.5468i -0.1779-0.0918i
-0.0758+0.3787i -0.3209+0.7723i 0.2373+0.1131i 0.1379-0.3496
Then, at step S304, whether judge J, if flow process proceeds to step S306 less than C.If J is not less than C, flow process then proceeds to step S305.In this example, this moment J=1, C=4, flow process enters step S306.At step S306, at first make Hc=[H Hs_e (:, J)], promptly the Hc H that equaled to select adds the J row of Hs_e.And the conditional number con1 of calculating Hc, forward step S307 then to.In this example, at this moment, I=1, J=1, H are empty now, then
Hc＝
-0.6545+0.2830i
-0.0758+0.3787i
Its conditional number is 1, changes step S307 then over to.
At step S307, judged whether con1＜=con_min * α, if then forward step S308 to.Otherwise, forward step S309 to.In this example, this moment con1=1, con_min=∞, α=0.9.Therefore flow process changes step S308 over to.At step S308, make Hs=Hc, con_min=con1.Forward step S311 then to.In this example, according to step S307, con_min=con1=1 then has
Hs＝Hc＝
-0.6545+0.2830i
-0.0758+0.3787i
In step S307, when judging that con1＜=con_min * when α was false, flow process forwarded step S309 to, has judged whether | con1-con_min|＜=con_min * (1-α).If, promptly, if the absolute value of the pairing conditional number of channel matrix of the new transmitting antenna of selecting and the difference of candidate channel matrix conditional number and the ratio of candidate channel matrix conditional number are less than 1-α, corresponding transmitting antenna flow process of those row that the then norm of the row of the channel matrix of the relatively newer transmitting antenna of selecting, and selection norm is bigger then enters step S310.If not, flow process then enters step S311.At step S310, select Hs according to norm, enter step S311 then.In this example, this moment I=1, J=2 when J=1, makes
Hs＝-0.6545+0.2830i
-0.0758+0.3787i
Hs is first row of Hs_e, and the row of interpolation are exactly first row of Hs_e, and the conditional number of Hs is 1.At this moment, J=2, Hc=[H Hs_e (:, 2)]=secondary series of Hs_e, the row of interpolation are exactly the secondary series of Hs_e.
Hc＝0.0174+0.1978i
-0.3209+0.7723i
The conditional number of Hc also is 1, then passes through step S304-S306-S307-S309-S310.The norm of the row of norm of the row that add of Hs (interpolation be first row of Hs_e) and Hc interpolation (interpolation be the secondary series of Hs_e) relatively, the row that norm is big stay to add among the H and go as Hs.The norm of the secondary series of Hs_e then has greater than the norm of first row at this moment
Hs＝0.0174+0.1978i
-0.3209+0.7723i
Next, at step S311, J is increased progressively 1, even J=J+1 rotates back into step S304 then, whether J is less than C.
In said process, when when step S304 judges that J is not less than C, flow process proceeds to step S305.At step S305, make H=Hs, I=I+1 removes Hs_e selected row then and becomes new Hs_e.After this, flow process forwards step S302 to.In this example, I=1, selected row are secondary series, then have
Hs_e becomes
Hs_e＝
-0.6545+0.2830i -0.4687+0.5468i -0.1779-0.0918i
-0.0758+0.3787i 0.2373+0.1131i 0.1379-0.3496i
Below illustrate specific implementation process according to of the present invention day line options.
The fixed amount of supposing reception antenna is N=2, and the quantity of total transmitting antenna is M=4, therefrom select K=2 as transmitting antenna.Suppose α=0.9.
H_e＝
-0.6545+0.2830i 0.0174+0.1978i -0.4687+0.5468i -0.1779-0.0918i
-0.0758+0.3787i -0.3209+0.7723i 0.2373+0.1131i 0.1379-0.3496
Step S304-S311 among Fig. 3 is for selecting the process of I root antenna.During beginning, H is an empty set, and I=1 makes Hs_e=H_e.At this moment, Hc has 4 kinds of possibilities, four row of corresponding Hs_e.These four kinds of possible conditional numbers all are 1, then will relatively come to determine by the norm of step S310, have obtained during such as J=1
con_min＝1；
Hs＝
-0.6545+0.2830i
-0.0758+0.3787i
J=J+1=2 then, at this moment
Hc＝0.0174+0.1978i
-0.3209+0.7723i
The conditional number that step S306 calculates Hc also is 1, and the comparison through step S307 enters step S309, enters step S310 from step S309.
At this moment, interpolation be first row, when J=1, Hs=Hc=[H Hs_e (:, 1)],
(H is for empty) candidate's Hs is first row of Hs_e, and the row of interpolation are exactly first row of Hs_e.When J=2, Hc=[H Hs_e (:, 2)]=secondary series of Hs_e, the row of interpolation are exactly the secondary series of Hs_e.The norm of the row that present relatively Hs adds and the norm of the row that Hc adds, the row that norm is big stay to add among the H and go as Hs.The norm of the secondary series of Hs_e is greater than the norm of first row, then at this moment
Hs＝0.0174+0.1978i
-0.3209+0.7723i
Work as J=3, choose according to the method described above during J=4.When J=4, chosen first antenna, corresponding to second of transmitting antenna, S305 obtains in step
H＝0.0174+0.1978i
-0.3209+0.7723i
Hs_e removes secondary series, obtains
Hs_e＝
-0.6545+0.2830i -0.4687+0.5468i -0.1779-0.0918i
-0.0758+0.3787i 0.2373+0.1131i 0.1379-0.3496i
I=2 selects second transmit antennas then, and second transmit antennas is had 3 kinds of selections.
For the first time, J=1 makes H1=Hc=[H Hs_e (:, 1)].
For the second time, J=2 makes H2=Hc=[H Hs_e (:, 2)].
For the third time, J=3 makes H3=Hc=[H Hs_e (:, 3)].
H1＝0.0174+0.1978i?-0.6545+0.2830i
-0.3209+0.7723i?-0.0758+0.3787i
Its conditional number is 1.8060.
H2＝0.0174+0.1978i -0.4687+0.5468i
-0.3209+0.7723i 0.2373+0.1131i
Its conditional number is 1.3176.
H3＝0.0174+0.1978i -0.1779-0.0918i
-0.3209+0.7723i 0.1379-0.3496i
Its conditional number is 6.3734.
Select the process of the 2nd antenna as follows:
At first I=2 enters step S303, this moment C=3, con_min=∞.J=1, J＜=C forwards step S306 to, and at step S306 assignment Hc=H1, the conditional number that obtains Hc is con1=1.8060.Then, the judgement through step S307 enters step S308.Obtain Hs=Hc, con_min=1.8060.Make J=J+1=2 at step S311 then.Forward step S304 then to.
At step S304, judge J＜=C.Then, forward step S306 to, assignment Hc=H2, the conditional number that obtains Hc is con1=1.3176.Judgement through step S307 enters step S308 then.Obtain Hs=Hc, con_min=1.3176.Flow process enters step S311 then, makes J=J+1=3, forwards step S304 to.
Judge J＜=C at step S304, forward step S306 to.At step S306, assignment Hc=H3, the conditional number that obtains Hc is con1=6.3734.Judgement through step S307 enters step S309 then.Judgement through step S309 enters step S311.S311 makes J=J+1=4 in step, forwards step S304 to.
Judge J＞C at step S304, enter step S305.At step S305, make I=I+1=3, remove selected row
H＝Hs＝0.0174+0.1978i -0.4687+0.5468i
-0.3209+0.7723i 0.2373+0.1131i
Hs_e＝-0.6545+0.2830i -0.1779-0.0918i
-0.0758+0.3787i 0.1379-0.3496i
Forward step S302 then to.
At step S302, judge to obtain I＞K, forward step S312 to, output H, and to select antenna accordingly be the 2nd and the 4th.So far the antenna selection course finishes.
When Fig. 4 had provided detector and is ZF (ZF) detector, the performance of the method for different sky line options relatively.In emulation, modulation system adopts 16-QAM, reception antenna quantity N=2, and the quantity M=2 of total transmitting antenna selects K=2 root antenna as transmitting antenna.
" not having the ZF of selection " among Fig. 4 and refer to, do not have a day line options, is 2 transmitting antennas, the performance of 2 reception antennas." norm " expression among Fig. 4 is based on the system of selection of norm." ergodic condition is counted ZF " that shows among Fig. 4 refers to according to traversal C
M KPlant the method for selecting H, choose the method for the H of conditional number minimum at last as channel matrix." iteration ZF " among the figure refers to the antenna selecting method in the embodiment." capacity optimum " refers to the method for selecting according to the maximum capacity traversal among Fig. 4.
When Fig. 5 showed detector and is LR (grid minimizing) detector, the performance of the method for different sky line options relatively." ergodic condition is counted LR " among Fig. 5 is corresponding to the method for " ergodic condition is counted ZF " among Fig. 4; " iteration LR " is corresponding to the method for " iteration ZF " among Fig. 4.
As can be seen from Figure 4 and Figure 5, with a kind of detection method, the traversal method performance of method of the present invention and capacity optimum is very approaching, is better than other method.But complexity is much lower.Suppose K=N, then Zui You sky line options will be calculated C
M KThe determinant on inferior K rank.And the method according to this invention does not need to calculate SVD (singular value decomposition) when design conditions are counted, and minimum and maximum singular value can be obtained with power method and inverse power method, and (as matrix is the k rank, and then complexity is O (k just can to obtain conditional number
2)).
Total complexity is approximately
, O represents exponent number.
As can be seen from Figure 4 and Figure 5, with a kind of detection method, the method for iteration (specific embodiment), better than the method for " ergodic condition number ", and also complexity is low.This is because what only choose the conditional number minimum is not optimum detection method, conditional number and norm all be considered.Such as among the hypothesis matrix H_e by two row mutually orthogonal and these two row forms unitary matrice Q (conditional number is 1), if choose two transmit antennas, and suppose that the channel matrix H=Q obtain at last is optimum.With the method for conditional number, also be like this.If but suppose a certain row amplification X times (H_e is listed as accordingly and amplifies X doubly) of Q is become Q1 (conditional number is X).Suppose that H=Q1 is optimum selection.If but only select just not necessarily can access optimum selection this moment based on conditional number.This is that if each row norm of channel matrix (being proportional to the signal power that receiving terminal obtains) is the same, the method for selecting of conditional number is optimum because the norm difference of each row of channel matrix causes the variation of conditional number.If the norm of each row is different, will consider the norm of each row of channel matrix.The rule of choosing channel matrix just should be that norm of each row of channel matrix conditional number of trying one's best big the time is more little.Like this, just more little to the raising of noise the recipient with linear detector.The present invention attempts to reach this result (when in fact selecting first, being exactly the row of the norm maximum of selection) exactly.Select according to the principle of taking all factors into consideration conditional number and norm then.
Invention has been described in conjunction with the preferred embodiments above.It should be appreciated by those skilled in the art that under the situation that does not break away from the spirit and scope of the present invention, can carry out various other change, replacement and interpolations.Therefore, scope of the present invention should not be understood that to be limited to above-mentioned specific embodiment, and should be limited by claims.
Claims (10)
1. select the method for transmitting antenna in the wireless communication system of antenna input and output more than a kind, comprise step:
The recipient carries out channel estimating according to the training sequence that sends and obtains all possible channel matrix H _ e, and regularly H_e is fed back to transmit leg;
Channel matrix H _ e according to feedback selects K transmitting antenna from the transmitting antenna that adds up to M, and at first select I root antenna, I wherein, and M and K are natural numbers, and K is less than M;
If the pairing conditional number of channel matrix of the new transmitting antenna of selecting and the ratio of candidate channel matrix conditional number are less than predetermined threshold α, then select the channel matrix of the new channel matrix of selecting, and determine that selected transmitting antenna is as transmitting antenna as the candidate.
2. method according to claim 1, wherein further make to comprise that the pairing channel matrix H s_e of candidate's antenna equals the step of all possible channel matrix H _ e of H_e in the step of selecting transmitting antenna, wherein the pairing channel of each candidate's antenna is shown in each tabulation of Hs_e.
3. method according to claim 1, comprise further that wherein the pairing channel matrix of antenna that acquisition has been selected adds that the J of candidate's antenna channel matrix H s_e is listed as, to obtain M-I+1 matrix H c, calculate the conditional number of resulting M-I+1 matrix H c, the antenna of the row correspondence of the antenna channel matrix H s_e that is added among the best matrix H c of selector bar number of packages is as the step of transmitting antenna.
4. according to any one the described method in the claim 1 to 3, wherein further comprise if the ratio of the absolute value of the difference of the pairing conditional number of channel matrix of the new transmitting antenna of selecting and candidate channel matrix conditional number and candidate channel matrix conditional number less than 1-α, the corresponding transmitting antenna of those row that the then norm of the row of the channel matrix of the relatively newer transmitting antenna of selecting, and selection norm is bigger.
5. according to any one the described method in the claim 1 to 4, wherein said predetermined threshold α is little and less than 1 number greater than 0.
6. method according to claim 3, the pairing channel matrix of antenna that wherein obtains to have selected add that the step that the J of candidate's antenna channel matrix H s_e is listed as comprises each step that is listed as of selecting all channel matrix H _ e respectively.
7. according to any one the described method in the claim 1 to 6, wherein the many antennas input and output detector at receiving terminal is a linear detector.
8. method according to claim 7, wherein said linear detector are the ZF detectors.
9. method according to claim 7, wherein said linear detector are that grid reduces detector.
10. select the device of transmitting antenna in the wireless communication system of antenna input and output more than a kind, comprising:
Channel estimating apparatus is used for estimating all possible channel matrix H _ e according to the training sequence of transmit leg, and regularly H_e is fed back to transmit leg;
Antenna selection apparatus is identified for sending the transmitting antenna of data according to the channel matrix H _ e of feedback;
Data processing equipment is used for data are changed, coding and demodulation, and by the treated data of selected transmitting antenna transmission;
The decision-feedback checkout gear is used for recovering the data that transmit leg sends from the channel estimating apparatus results estimated.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CNA2005100629103A CN1841961A (en) | 2005-03-30 | 2005-03-30 | Method and apparatus for selecting transmitting antenna in multi antenna wireless communication system |
| PCT/JP2006/306525 WO2006106762A1 (en) | 2005-03-30 | 2006-03-29 | Multiantenna radio communication system, and transmission antenna selecting method |
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| CNA2005100629103A CN1841961A (en) | 2005-03-30 | 2005-03-30 | Method and apparatus for selecting transmitting antenna in multi antenna wireless communication system |
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| WO (1) | WO2006106762A1 (en) |
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