CN102316598B - Orthogonal random beam forming (PRBF) multi-user dispatching method based on greed beam selection strategy - Google Patents

Abstract

The invention discloses an orthogonal random beam forming (PRBF) multi-user dispatching method based on a greed beam selection strategy, which comprises the following steps that: (1) each user feeds back channel sate information (CSI) to a base station; (2) the dispatching of single beam is supposed for transmitting data, and the base station selects a pair of user beam combinations for forming adispatching scheme and calculates the system speed at the time; (3) the number of the beams to be supposed to be dispatched is increased, the base station selects a pair of user beam combinations from an undispatched user set and a beam set to be added into the original dispatching scheme, and the corresponding system speed of the updated scheme is calculated; (4) the third step is repeated untilthe number of the beams to be supposed to be dispatched reaches the dispatchable beam number upper limit; and (5) the base station selects the dispatching scheme most suitable for the current channelenvironment for realizing the data transmission according to the system speed of each scheme corresponding to the number of the beams to be dispatched. The method has the advantages that the proper beams can be dispatched in a self adaptive way in the ORBF scheme in different channel environment, users can carry out data transmission, and the system performance of the ORBF scheme is greatly improved.

Description

A kind of ORBF multi-user dispatching method based on greedy beam selection strategy

Technical field

The present invention relates to the multiuser MIMO technology, relate to the Adaptive Transmission scheduling strategy of MIMO BC down channel, be specifically related to a kind of ORBF multi-user dispatching method based on greedy beam selection strategy.

Background technology

In the multiuser MIMO downlink system, orthogonal random beam forming (ORBF) advantages such as computation complexity is low owing to having, the CSI feedback quantity is few for the Sharif proposition have caused the concern of Many researchers.When number of users is many, have the progressive performance identical with the DPC algorithm; But when the user was fewer, the systematic function of ORBF algorithm can sharply descend.In addition, under the high s/n ratio environment, the ORBF system can be in " interference-limited " state, at this moment the lifting of the performance of the serious system for restricting of interference meeting between wave beam.And studies have shown that in a large number, in the ORBF transmission policy, dispatch not necessarily optimal transmission scheme of all wave beams.Therefore, in order to overcome the above-mentioned shortcoming of ORBF, a large amount of researchers have proposed the multi-subscriber dispatching strategy on the basis of traditional ORBF.

Now, the ORBF multi-user dispatching method that existing document proposes also comprises bottom-up scheduling strategy, top-down scheduling strategy and based on the multi-beam selection algorithm of look-up table, the below describes respectively except traditional ORBF strategy.

Typical traditional ORBF scheduling strategy roughly is described below.Do not have the adaptive user beam dispath during traditional ORBF strategy that Sharif proposes, so this algorithm is all dispatched all wave beams at each sending time slots and is carried out transfer of data for the best user of channel circumstance separately.But under most of environment, dispatch the not necessarily transmission plan of optimum of all wave beams, particularly under the high s/n ratio environment, system is in " interference-limited " state, and the wave beam that at this moment is more prone to dispatch still less affects systematic function to reduce inter-beam interference.So there is larger performance loss under many circumstances in traditional ORBF.

Typical bottom-up scheduling strategy roughly is described below.This algorithm is 1 o'clock at the scheduling numbers of beams first, and the user for each beam allocation performance behaves oneself best makes up as fixing user wave beam with this.Then, the user that the first step chooses (and wave beam of their correspondences) will in various scheduling numbers of beams backward, make up by all possible arrangement mode, and calculate its performance.Finally in all combinations, find the highest user wave beam combination of systematic function as the scheduling scheme of this data transfer.This algorithm is when actual optimal scheduling numbers of beams is 1, and systematic function can have greatly improved.But when the actual schedule numbers of beams was higher, the scheme that draws of this algorithm is preferred plan not necessarily, even this will not reach best systematic function so that this algorithm is dispatched correct numbers of beams yet.

Typical top-down scheduling strategy roughly is described below.Completely contradict with bottom-up algorithm, the first step of top-down algorithm is that the hypothesis numbers of beams that is scheduled is N _t, and be the user that allocation performance behaves oneself best in each wave beam, match as fixing user wave beam with this.Then, the user that the first step chooses (and wave beam of their correspondences) will in various possible numbers of beams backward, make up by all possible arrangement mode, and calculate its performance.Finally in all combinations, find the highest user wave beam combination of systematic function as the scheduling scheme of this data transfer.When this algorithm was fit to all wave beams of scheduling at current channel circumstance, top-down algorithm can reach best performance.But when the actual schedule numbers of beams reduces, because this user wave beam regular collocation best pairing of channel conditions at that time not necessarily, so performance can be lost.

Typically roughly be described below based on look-up table multi-beam selection strategy.Multi-beam selection algorithm based on look-up table can be kept at scheduling numbers of beams best under the different channels environment in the base station with form of look by analog simulation in advance.In each sending time slots, system can draw the optimal beam number according to current channel circumstance from look-up table, then to various may the user wave beam combination traversal under this numbers of beams, finds out optimum scheduling scheme under system's corresponding scheduling numbers of beams.This strategy can only provide an approximate scheduling numbers of beams reference value according to look-up table interval, current channel circumstance place.In time varying channel environment complicated and changeable, because the precision problem of searching, this strategy very easily allows the wave beam of system call number of errors carry out transfer of data, is that systematic function has larger loss.

No matter above-mentioned which kind of user's scheduling strategy all only just can make system reach best performance under specific channel circumstance, can not really make the higher performance of system's acquisition according to different channels environment self-adaption scheduling preferred plan.Therefore, be necessary that the ORBF multi-user dispatching method that proposes the various channel circumstances of a kind of self adaptation overcomes defects.

Summary of the invention

The Multi User Adaptive dispatching method that the purpose of this invention is to provide ORBF, can make base station adjustment will be dispatched according to the different channels environment self-adaption user and the wave beam of realizing the ORBF scheduling strategy, make the ORBF strategy under the different channels environment, also can improve well systematic function, particularly overcome traditional ORBF when number of users is lower or signal to noise ratio low defective of performance higher the time.

To achieve these goals, the invention provides a kind of ORBF multi-user dispatching method based on greedy beam selection strategy, comprise the steps: that (1) each user feeds back to the base station with its channel condition information CSI; (2) supposition scheduling simple beam the transmission of data, when namely dispatching numbers of beams B=1, the base station selects a pair of user wave beam to be combined to form scheduling scheme from user's set and beam set, and calculates system's speed of this moment; (3) increase the numbers of beams of supposition scheduling, the base station is selected a pair of user wave beam to make up in the user's set that is not scheduled and beam set to augment into former scheduling scheme, and calculates the corresponding system speed under the scheme after this renewal; (4) repeating step (3) can be dispatched numbers of beams upper limit N until supposition scheduling numbers of beams reaches the base station _t(5) according to system's speed of the corresponding scheme of each scheduling numbers of beams, the base station selected scheduling scheme that goes out to be best suited for current channel circumstance is realized transfer of data.

In one embodiment of the invention, the CSI of described each user feedback is the system gain between each user and all wave beams

Wherein, Be the channel gain vector between base station and k the user,

And 1≤k≤K, K are the total number of users in the residential quarter, place, base station; w _iBe i beam forming vector of base station generation,

And 1≤i≤N _t, N _tWave beam sum for antenna for base station formation.In the user feedback CSI stage, each user k must be with N _tIndividual system gain numerical value

And corresponding wave beam numbering i feeds back to the base station.K * N can be set up in the base station after accepting the CSI of all user feedbacks _tAll users of dimension and the system gain matrix G between wave beam namely can be known whole channel condition information.Wherein

1≤k≤K, 1≤i≤N _t, and

In another embodiment of the present invention, described each user realizes zero defect CSI feedback by MIMO MAC up channel.

In an again embodiment of the present invention, the best user of base station selected channel circumstance and corresponding wave beam form scheduling scheme in the described step (2).

In another embodiment of the present invention, base station selected under simple beam in the described step (2), the user that channel Signal to Interference plus Noise Ratio SINR value is maximum.

In an again embodiment of the present invention, the user wave beam that increases in the described step (3) is to all must being under current scheduling numbers of beams, based on the channel circumstance of former scheduling scheme best user and corresponding wave beam thereof, even maximum user and the corresponding wave beam thereof of the SINR value of system.

In another embodiment of the present invention, described step (3) is specially: (31) order scheduling numbers of beams B=B+1, and the user wave beam scheduling scheme the selected set of order scheduling numbers of beams when being B-1 is S; (32) base station is in non-selected user wave beam set, select a kind of user wave beam combination to augment into the scheduling scheme S set, selecteed user wave beam combination is under the current scheduling numbers of beams B, after augmenting the scheduling scheme when being B-1 into the scheduling numbers of beams, make system obtain when selecting all the other user wave beam combinations all user and the corresponding wave beam thereof of large SINR value, on this moment, the scheduling scheme after augmenting can allow the basis of the scheduling scheme S set of system before this is augmented, reach the lower the highest system speed that can reach of current scheduling numbers of beams; (33) calculate under the current scheduling numbers of beams system's speed that the scheduling scheme after augmenting reaches.

In another embodiment of the present invention, described system speed is under the multiuser MIMO environment, system is issued in the current scheduling scheme and speed (Sum-rate), then, after finished described step (2), (3), (4), system will obtain the N identical with the wave beam total quantity _tIndividual and speed, each and speed are corresponding to a kind of scheduling scheme of dispatching under numbers of beams and this numbers of beams.

In an again embodiment of the present invention, be best suited for current basis for estimation of carrying out the user wave beam scheduling scheme of transfer of data in the described step (5) and be specially: at final N _tPlant in the scheduling scheme, the maximum scheme of correspondence and speed of selecting is carried out transfer of data as the optimal scheduling scheme of current time slots for the base station.

Compared with prior art, the ORBF multi-user dispatching method that the present invention is based on greedy beam selection strategy can carry out transfer of data according to suitable user and the wave beam of different channels environment self-adaption scheduling, efficiently solve ORBF at number of users less and signal to noise ratio higher in performance be subject to the defective that seriously restricts.Overcome simultaneously bottom-up beam dispath strategy, top-down beam dispath strategy and can only under the particular channel environment, just can make system obtain the defective of significant performance improvement based on look-up table multi-beam selection strategy etc.In a word, this method can significantly be improved ORBF systematic function under the different channels environment.

By following description also by reference to the accompanying drawings, it is more clear that the present invention will become, and these accompanying drawings are used for explaining embodiments of the invention.

Description of drawings

Fig. 1 is the flow chart that the present invention is based on the ORBF multi-user dispatching method of greedy beam selection strategy.

Fig. 2 is the residing typical multiuser MIMO BC downlink broadcast channel circumstance of the ORBF multi-user dispatching method based on greedy beam selection strategy shown in Figure 1.

Fig. 3 is shown in Figure 1 based on each user feedback channel condition information schematic diagram in the ORBF multi-user dispatching method of greedy beam selection strategy.

Fig. 4 a-4d is the screening pairing process of utilizing greedy algorithm that user and wave beam are carried out in the ORBF multi-user dispatching method based on greedy beam selection strategy shown in Figure 1.

Fig. 5 is the schematic diagram that utilizes greedy algorithm dispatched users and the laggard row transfer of data of wave beam in the ORBF multi-user dispatching method based on greedy beam selection strategy shown in Figure 1.

Embodiment

With reference now to accompanying drawing, describe embodiments of the invention, similar element numbers represents similar element in the accompanying drawing.

The ORBF multi-user dispatching method that the present invention is based on greedy beam selection strategy is based under the typical multiuser MIMO down channel environment to be realized: in MIMO BC downlink broadcast channel, cell base station BS disposes N _tRoot antenna, residential quarter have K single antenna user; The wave beam that each antenna forms and the channel between each user are separate rayleigh fading channels; Each user terminal can obtain complete CSI, and can utilize MIMO MAC up channel low speed zero defect feedback CSI.

Before setting forth the ORBF multi-user dispatching method of the present embodiment based on greedy beam selection strategy, the following concept that relates in the described method is described first:

Signal to Interference plus Noise Ratio (SINR): the ratio of the signal power that receives for terminal in multiplex MIMO downlink system and noise power, interference power.In the ORBF scheduling strategy, if k the needed information of user is transmitted by wave beam i, then this user's the signal that receives is:

$r_k=h_k^T{W}_B{s}_B+n_k=h_k^T{w}_i{s}_i+\underset{j\∈B,j\≠i}{\mathrm{\Σ}}{h}_k^T{w}_j{s}_j+n_k$

Wherein,

Be the channel gain matrix between base station and k the user,

B is the current scheduling beam subset in base station, and B=card (B) is corresponding scheduling numbers of beams; W _BThe submatrix about the random beam forming matrix of scheduling beam subset B that generates for the base station, and w _i∈ W _B, i ∈ B; s _BThe transmit data set subset about scheduling beam subset B that will send for the base station, and s _i∈ s _B, i ∈ B; n _kThe additive white Gaussian noise that experiences for the channel between base station and k the user.At this moment, if the total emission power of base station be

And the base station transmitting power mean allocation is to the wave beam of each the transmission of data, and then the transmitting power of each wave beam acquisition is P/B.Can get thus, the average signal-to-noise ratio of transmission system is ρ=P/ σ ²So the Signal to Interference plus Noise Ratio SINR that we can obtain between user k and the i wave beam is:

${\mathrm{SINR}}_{k,i}=\frac{{\left|h_k^T{w}_i\right|}^2}{B/\mathrm{\ρ}+{\mathrm{\Σ}}_{j\∈B,j\≠i}{\left|h_k^T{w}_j\right|}^2}$

And speed (Sum-rate): be all channel transmission rate sums of system, and the maximum of speed just is referred to as system and capacity.So as base station scheduling N _tB in an individual wave beam wave beam carries out transfer of data, and when the power P mean allocation is used for the wave beam of emission to each, and the speed expression formula is:

$R\left(B\right)\&cong;\underset{i\&Element;B}{\mathrm{\&Sigma;}}{\log }_2(1+\underset{1\&le;k\&le;K}{\mathrm{<figure-callout\; id="1"\; label="max"\; filenames="HDA0000091984940000011.png,HDA0000091984940000021.png"\; state="\{\{state\}\}">max</figure-callout>}}{\mathrm{SINR}}_{k,i}\left(B\right))$

Wherein,

In K user, the be scheduled maximum SINR value of wave beam i of correspondence.

The below specifies the present embodiment based on the flow process of the ORBF multi-user dispatching method of greedy beam selection strategy.In conjunction with Fig. 1, Fig. 3, Fig. 4 a-4d, Fig. 5, suppose that base station BS forms altogether N _t=4 wave beam A, B, C, D, there are K=8 single antenna user a, b, c, d, e, f, g, h in the residential quarter, then said method comprising the steps of:

Step S1, base station BS allow all N that formed by antenna _tIndividual wave beam utilizes MIMO BC down channel all K user in the residential quarter to broadcast training symbol, and each user k receives the system gain that calculates behind the broadcast singal separately for each wave beam i

In the user feedback CSI stage, each user k utilizes the MIMOMAC feedback channel N separately _tIndividual system gain

I ∈ N _t, and corresponding wave beam numbering i feeds back to base station BS (such as Fig. 3), base station BS is set up system gain matrix G between current all users and wave beam according to the CSI of all user feedbacks, and the current available user of initialization gathers K ₁=1 ..., K}, current available beam set B ₁=1 ..., N _t, selection scheduling scheme

(such as Fig. 3, K ₁={ k _a, k _b, k _c, k _d, k _e, k _f, k _g, k _h, B ₁={ i _A, i _B, i _C, i _D);

Step S2, order scheduling numbers of beams B=1, base station BS are according to system gain matrix G, from selectable user set K ₁, beam set B ₁In select a pair of in simple beam transfer of data situation, the best user wave beam of channel circumstance combination (k ₁, i ₁), this user wave beam combination meets the requirements:

$({\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="HDA0000091984940000011.png,HDA0000091984940000021.png"\; state="\{\{state\}\}">k</figure-callout>}}_1,i_1)=\arg {\max }_{(k,i)}\mathrm{\&rho;}{\left|h_k^T{w}_i\right|}^2,\&ForAll;(k,i)\&Element;{\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="HDA0000091984940000011.png,HDA0000091984940000021.png"\; state="\{\{state\}\}">K</figure-callout>}}_1\&times;{\mathrm{<figure-callout\; id="1"\; label="B"\; filenames="HDA0000091984940000011.png,HDA0000091984940000021.png"\; state="\{\{state\}\}">B</figure-callout>}}_1$

Wherein, (k ₁, i ₁) being numbering corresponding to this user wave beam combination, ρ is system's average signal-to-noise ratio, and with (k ₁, i ₁) add among the scheduling scheme S, make S={ (k ₁, i ₁) (such as Fig. 4 a, S={ (k _e, i _B));

Step S3 calculated when this moment, simple beam was dispatched, system and speed during ORBF scheduling S:

${\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="HDA0000091984940000011.png,HDA0000091984940000021.png"\; state="\{\{state\}\}">R</figure-callout>}}_1=\mathrm{\&Theta;}\left(\mathrm{\&rho;}{\left|h_{k_1}^T{w}_{i_1}\right|}^2\right)$

Wherein, Θ (x)=log ₂(1+x)

Step S4, order scheduling numbers of beams B=B+1, base station BS makes selectable user set K _B=K _B-1-{ k _B-1, optional beam set B _B=B _B-1-{ i _B-1, k wherein _B-1For adding behind the scheduling scheme so that the scheduling numbers of beams becomes the user of B-1, i _B-1For adding in the scheduling scheme so that the scheduling numbers of beams becomes the wave beam of B-1;

Step S5, base station BS is according to the selectable user set K that obtains among the step S4 _BWith beam set B _BNot selected user and wave beam are carried out various combination pairings;

Step S6, base station BS therefrom is chosen under the current scheduling numbers of beams according to the various combination pairings that obtain among the step S5, and the best user of channel circumstance and corresponding wave beam thereof form user wave beam combination (k _B, i _B), this user wave beam combination meets the requirements:

$(k_B,i_B)=$

$\arg {\max }_{(k,i)}\left\{\begin{array}{c}\mathrm{\&Theta;}\left(\frac{{\left|h_k^T{w}_i\right|}^2}{B/\mathrm{\&rho;}+{\mathrm{\&Sigma;}}_{s=1}^{B-1}{\left|h_k^T{w}_{i_s}\right|}^2}\right)\\ +\underset{p=1}{\overset{B-1}{\mathrm{\&Sigma;}}}\mathrm{\&Theta;}\left(\frac{{\left|h_{k_p}^T{w}_{i_p}\right|}^2}{B/\mathrm{\&rho;}+{\left|h_{k_p}^T{w}_i\right|}^2+{\mathrm{\&Sigma;}}_{s=1,s\&NotEqual;p}^{B-1}{\left|h_{k_p}^T{w}_{i_s}\right|}^2}\right)\end{array}\right\},$

$\&ForAll;(k,i)\&Element;K_B\&times;B_B$

Wherein, (k _B, i _B) be the numbering of this user wave beam combination correspondence, Θ (x)=log ₂(1+x), this user wave beam combination (k _B, i _B) be at current selectable user beam set K _B, B _BIn, can make system on the basis of original scheduling scheme S, all user wave beam combinations of large SINR value can make system reach the lower the highest system speed that can reach of current scheduling numbers of beams when ratio was selected all the other user wave beam combinations under the acquisition current scheduling numbers of beams, should make up (k _B, i _B) be added among the scheduling scheme S i.e. S=S+{ (k _B, i _B);

Step S7 calculates when current scheduling numbers of beams B, system and speed during ORBF scheduling S:

$R_B=\underset{p=1}{\overset{B}{\mathrm{\&Sigma;}}}\mathrm{\&Theta;}\left(\frac{{\left|h_{k_p}^T{w}_{i_p}\right|}^2}{B/\mathrm{\&rho;}+{\mathrm{\&Sigma;}}_{s=1,s\&NotEqual;p}^B{\left|h_{k_p}^T{w}_{i_s}\right|}^2}\right)$

Wherein, Θ (x)=log ₂(1+x);

Step S8 judges whether scheduling numbers of beams B counts N less than main aerial _t, namely whether B meets B＜N _t, if so, turn step S4(such as Fig. 4 b-4d), if not, continue next step;

Step S9, base station BS is finally obtaining N _tPlant in the scheduling scheme and select correspondence system and speed R _B, 1≤B≤N _tA scheme S of numerical value maximum _End, S _EndMeet following requirement:

B ^*=argmax _BR _B,1≤B≤N _t

$S_{\mathrm{end}}=\{({\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="HDA0000091984940000011.png,HDA0000091984940000021.png"\; state="\{\{state\}\}">k</figure-callout>}}_1,i_1),...,(k_{B^{*}},i_{B^{*}})\}$

Wherein, B ^*For with scheduling numbers of beams corresponding to the maximum scheme of speed, S _EndCorrespond to the front B of S ^*The final scheduling scheme that individual user wave beam combination forms, base station BS is according to final scheduling numbers of beams B ^*With scheduling scheme S _EndRealize the adaptive scheduling (such as Fig. 5) of current time slots, and current system and speed are

, finish;

As seen from the above, the present embodiment can carry out transfer of data according to suitable user and the wave beam of different channels environment self-adaption scheduling based on the ORBF multi-user dispatching method of greedy beam selection strategy, this selection scheduling process is constantly evolution on existing scheduling scheme, can maximally utilise existing scheduling scheme, avoid increasing the scheduling numbers of beams and need to again screen pairing to all user wave beam.By the method, efficiently solve ORBF at number of users less and signal to noise ratio higher in systematic function be subject to the defective of serious restriction.Overcome simultaneously bottom-up beam dispath strategy, top-down beam dispath strategy and can only under the particular channel environment, just can make system obtain the defective of significant performance improvement based on look-up table multi-beam selection strategy etc., made system when implementing the ORBF scheme, under different signal to noise ratio environment, can both obtain significantly performance improvement.

Above invention has been described in conjunction with most preferred embodiment, but the present invention is not limited to the embodiment of above announcement, and should contain various modification, equivalent combinations of carrying out according to essence of the present invention.

Claims (8)

1. the ORBF multi-user dispatching method based on greedy beam selection strategy comprises the steps:

(1) each user feeds back to the base station with its channel condition information (CSI); The CSI of described each user feedback is the system gain between each user and all wave beams of base station

Wherein,

Be the channel gain vector between base station and k the user,

And 1≤k≤K, K are the total number of users in the residential quarter, place, base station, w _iBe i beam forming vector of base station generation,

And 1≤i≤N _t, N _tBe the wave beam sum of antenna for base station formation,

Then, in the user feedback CSI stage, each user k must be with N _tIndividual system gain numerical value

And corresponding wave beam numbering i feeds back to the base station,

Then, K * N can be set up in the base station behind the CSI that receives all user feedbacks _tAll users of dimension and the system gain matrix G between wave beam, thus can know whole channel condition information, wherein

1≤k≤K, 1≤i≤N _t, and

(2) supposition scheduling simple beam the transmission of data, when namely dispatching numbers of beams B=1, the base station selects a pair of user wave beam to be combined to form scheduling scheme from user's set and beam set, and calculates system's speed of this moment;

(3) increase the numbers of beams of supposition scheduling, the base station is selected a pair of user wave beam to make up in the user's set that is not scheduled and beam set to augment into former scheduling scheme, and calculates the corresponding system speed under the scheme after this renewal;

(4) repeating step (3) can be dispatched numbers of beams upper limit N until supposition scheduling numbers of beams reaches the base station _t

(5) according to system's speed of the corresponding scheme of each scheduling numbers of beams, the base station selected scheduling scheme that goes out to be best suited for current channel circumstance is realized transfer of data.

2. the ORBF multi-user dispatching method based on greedy beam selection strategy as claimed in claim 1 is characterized in that, each user realizes zero defect CSI feedback by MIMO MAC up channel.

3. the ORBF multi-user dispatching method based on greedy beam selection strategy as claimed in claim 1 is characterized in that, in the described step (2), the user that base station selected channel circumstance is best and corresponding wave beam form scheduling scheme.

4. the ORBF multi-user dispatching method based on greedy beam selection strategy as claimed in claim 1 is characterized in that, and is base station selected under simple beam in the described step (2), the user that channel Signal to Interference plus Noise Ratio SINR value is maximum.

5. such as the described ORBF multi-user dispatching method based on greedy beam selection strategy in one of claim 3 or 4, it is characterized in that, the user wave beam that increases in the described step (3) is to all must being under current scheduling numbers of beams, based on the channel circumstance of former scheduling scheme best user and corresponding wave beam thereof, even maximum user and the corresponding wave beam thereof of the SINR value of system.

6. such as the described ORBF multi-user dispatching method based on greedy beam selection strategy of one of claim 1-4, it is characterized in that, described step (3) is specially:

The user wave beam scheduling scheme of having selected set when (31) order scheduling numbers of beams B=B+1, and order scheduling numbers of beams is B-1 is S;

(32) base station is in non-selected user wave beam set, select a kind of user wave beam combination to augment into the scheduling scheme S set, selecteed user wave beam combination is under the current scheduling numbers of beams B, after augmenting the scheduling scheme when being B-1 into the scheduling numbers of beams, make system obtain when selecting all the other user wave beam combinations all user and the corresponding wave beam thereof of large SINR value, on this moment, the scheduling scheme after augmenting can allow the basis of the scheduling scheme S set of system before this is augmented, reach the lower the highest system speed that can reach of current scheduling numbers of beams;

(33) calculate under the current scheduling numbers of beams system's speed that the scheduling scheme after augmenting reaches.

7. the ORBF multi-user dispatching method based on greedy beam selection strategy as claimed in claim 6 is characterized in that, described system speed is under the multiuser MIMO environment, system is issued in the current scheduling scheme and speed (Sum-rate),

Then, after finished described step (2), (3), (4), system will obtain the N identical with the wave beam total quantity _tIndividual and speed, each and speed are corresponding to a kind of scheduling scheme of dispatching under numbers of beams and this numbers of beams.

8. the ORBF multi-user dispatching method based on greedy beam selection strategy as claimed in claim 7 is characterized in that, is best suited for current basis for estimation of carrying out the user wave beam scheduling scheme of transfer of data in the described step (5) and is specially:

At final N _tPlant in the scheduling scheme, the maximum scheme of correspondence and speed of selecting is carried out transfer of data as the optimal scheduling scheme of current time slots for the base station.

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