CN101034927A - Multi-user and multi-antenna uplink transmission-receiving method for reducing the inter-cell/in-cell disturbance - Google Patents

Abstract

The invention proposes a lower district inter / multi-user interference in the multi-antenna uplink to send and receive treatment. In the border district choice by sending antenna technology, according to a certain rate under restrictive conditions so that each district's largest user channel capacity to the principle choice antenna; meanwhile, in order to make the calculation, according to the covariance matrix signal antenna constraint conditions and antenna selection. Antenna Selection send a signal to reduce the number of antenna, when the number of all is not more than a few base station antenna used antenna will provide a base station end in a multi-user detection opportunities. So the invention proposes a case-by-user serial interference delete method, the advantage is that multiple users can simultaneously use the launch information, at the same timereduce interference in the district .By joining transmitter and the receiver antenna choice of multi-user detection, it will reduce the interference between district and inter-district , so it improves the communication quality.

Description

Reduce the up transmission-method of reseptance of multi-user multi-antenna of minizone/interior interference

Technical field

The present invention relates to the wireless messages transmission field, particularly adopt the information transmission system such as WLAN (wireless local area network), fixed wireless access, mobile communication, ground digital television broadcast of multi-antenna technology (MIMO).More particularly, the present invention relates to a kind of multi-user multi-antenna (MIMO) up link transmission-method of reseptance that reduces minizone/interior interference.

Background technology

Along with the fusion gradually of wireless network, multimedia technology and internet, people are more and more higher to the requirement of the type of radio communication service and quality.For satisfying the requirement of radio multimedium and high speed data transfers, need the Development of New Generation wireless communication system, and it will extensively adopt some new technologies, as many antennas multiple-input and multiple-output (MIMO) etc.

Mimo system is meant sending and receiving terminal use multi-antenna array, does to significantly improve power system capacity and wireless transmission link quality like this.The mode of utilizing the MIMO technology to improve power system capacity and transmission quality comprises two classes: space division multiplexing and space diversity.The typical application example of space division multiplexing is the layered space-time architecture (BLAST) that Bell Laboratory proposes, and it resolves into several independent sub data flows to entire stream and sends from several antennas are parallel; During more than or equal to number of transmit antennas, channel capacity and the number of transmit antennas of BLAST are linear at the reception antenna number.Space diversity be utilize to send, the multipath transmisstion between reception antenna and improve system robustness; It comprises receive diversity and sends diversity, as space-time trellis codes and Space-Time Block Coding etc.

In the honeycomb mimo system; when user terminal transmits multimedia, visual telephone business; require low time delay and low grouping (packet) loss ratio, and the user terminal that is positioned at cell edge is subject to the influence of channel shadow fading and other subscriber signals of sub-district, the quality regular meeting reduction of transport service.Simultaneously, when the user was positioned at cell edge, the multi-antenna signal of its transmission can bring more serious co-channel interference to the neighbor cell user.Disturb for reducing in minizone and the sub-district, improve the transport service quality, the present invention proposes by transmitting terminal sky line options and receiving terminal Multiuser Detection, reaches and reduces the purpose of disturbing and improving power system capacity.

The list of references tabulation:

[1]3GPP?R1-050590，NTT?DoCoMo，Physical?channels?andmultiplexing?in?evolved?UTRA?downlink，RAN1?Ad?Hoc?on?LTE

[2]3GPP?R1-050591，NTT?DoCoMo，Physical?channels?andmultiplexing?in?evolved?UTRA?uplink，RAN1?Ad?Hoc?on?LTE

Summary of the invention

The object of the present invention is to provide a kind of multi-user multi-antenna up link transmission-receiving handling method that reduces minizone/interior interference.

In general sky line options technology, only consider the point-to-point multiaerial system of single user, reckon without the influence of presence of intercell interference in the cellular system, under the actual cellular environment, presence of intercell interference is very important.When many antennas user is positioned at cell edge, if increase the number of transmit antennas of Target cell, can improve the speed of Target cell, the cochannel that other neighbor cells are caused disturbs and increases simultaneously, causes the reduction of power system capacity; Otherwise, if reduce the Target cell number of transmit antennas, will reduce the speed of Target cell, the cochannel that other neighbor cells are caused disturbs lessly simultaneously, can increase system's average size.Therefore, need be rationally compromise between single sub-district speed and power system capacity.

Consider the relation of single sub-district speed and power system capacity, the thought of the antenna selecting method that the present invention proposes is: in inside, sub-district, do not carry out emitting antenna selecting, to guarantee transmission rate; At the cell boarder place, adopt transmitting antenna to select technology.Though emitting antenna selecting has reduced the transmission rate of unique user, reduced the co-channel interference of this user simultaneously to neighbor cell, can obtain the honeycomb system capacity gain.

When user terminal carries out emitting antenna selecting, reduced user rate, but user rate cross low then can not proper communication, so need be selected antenna number under certain user rate constraints.Therefore, the antenna selection principle that the present invention proposes is: the antenna number after the user selects can satisfy under the condition of minimum transmission rate of its requirement, makes the antenna of selecting can obtain the channel capacity maximum of each community user.Simultaneously, calculate for simplifying, channel capacity is converted into the determinant of signal calculated covariance matrix, promptly carry out emitting antenna selecting according to the covariance matrix and the antenna constraints of signal.Adopt enumerative technique to find the solution above-mentioned constrained optimization problem.

Therefore,, proposed a kind of emitting antenna selecting method, be used for reducing the minizone/interior interference of multi-user multi-aerial system, may further comprise the steps: judged whether user terminal is in cell edge according to first scheme of the present invention; When user terminal is in cell edge, according to predetermined transmission rate constraints, the antenna number of base station end, so that the mode of the subscriber channel capacity maximum of described sub-district, the transmitting antenna of selection user terminal.

Select by user terminal antenna, reduced the antenna number that is used to send signal.When the antenna sum of all user terminals is not more than base station end antenna number, provide the chance of carrying out Multiuser Detection at the base station end.At this moment, if all user terminals after day line options are regarded as antenna transmission end more than, this transmitting terminal and base station receiving terminal constitute a new MIMO communication system, then can carry out the MIMO Multiuser Detection.

Therefore, according to alternative plan of the present invention, proposed a kind of signal recovery method, be used for carrying out serial interference delete, be applied to multi-user multi-aerial system by user ground, in each sub-district of described system, the antenna number of base station said method comprising the steps of more than or equal to the antenna sum of user terminal: the user terminal selecting step, according to channel matrix, select the highest user terminal of average signal-to-noise ratio, as the current detection user terminal; It line options step judges whether the current detection user terminal has several transmitting antennas, if having several transmitting antennas, then, select the highest antenna of signal to noise ratio, as antenna to be detected according to channel matrix, if have only a width of cloth transmitting antenna, then choose this antenna, as antenna to be detected; The signal recovering step is utilized the zero setting vector corresponding with antenna to be detected, recovers the data corresponding with antenna to be detected; Step of updating, the signal on the antenna to be detected that deletion has recovered from received signal is to upgrade received signal and to delete the row corresponding with antenna to be detected to upgrade channel matrix from channel matrix; The antenna determining step judges whether whole transmitting antennas of current detection user terminal have been carried out the signal recovery, if judged result negate, then return a day line options step, select next antenna to be detected; The user terminal determining step judges whether whole user terminals to have been carried out the signal recovery, if judged result negates then to return the user terminal selecting step; Otherwise the signal of having finished whole user terminals recovers.

In addition, in conjunction with above-mentioned first and second schemes, the present invention proposes third party's case, according to this scheme, up transmission-the receiving handling method of a kind of multi-user multi-antenna has been proposed, be used for reducing the minizone/interior interference of multi-user multi-aerial system, in each sub-district of described system, the antenna number of base station is more than or equal to the antenna sum of user terminal, described method comprises: user terminal according to the present invention the described emitting antenna selecting method of first scheme carry out emitting antenna selecting, and send data-signal to the base station by selected transmitting antenna; The base station is the described signal recovery method of alternative plan according to the present invention, recovers the data-signal that is sended over by user terminal.

To being positioned at the user of cell edge in many cell mimos system, the present invention proposes to carry out emitting antenna selecting at user terminal earlier, to reduce interference and the raising mimo system capacity to neighbor cell; Simultaneously, when all the user terminal antenna sums after selecting are not more than base station end antenna number, make that carrying out Multiuser Detection at the base station end becomes possibility, and then propose a kind of by user's serial interference delete method, its advantage is to have utilized a plurality of users' emission information simultaneously, and has reduced user's interference in the sub-district.By transmitting terminal sky line options and receiving terminal Multiuser Detection, reduced simultaneously in minizone and the sub-district and disturbed, improved user communication quality.

Description of drawings

Below with reference to accompanying drawings, the preferred embodiments of the present invention are described in detail, wherein:

Fig. 1 shows the schematic diagram of the example of honeycomb mimo system;

Fig. 2 shows the example schematic diagram of many sub-districts;

Fig. 3 shows the schematic diagram of MIMO transmit-receive unit, and wherein Fig. 3 (a) is the schematic diagram of transmitting terminal, and Fig. 3 (b) is the schematic diagram of receiving terminal;

Fig. 4 is the schematic diagram that is used to explain according to the antenna selecting plan of the embodiment of the invention;

Fig. 5 shows the flow chart according to each step of the antenna selecting method of the embodiment of the invention;

The schematic diagram of the system's average size comparative result when Fig. 6 shows selection and non-selected transmitting antenna;

Fig. 7 shows the schematic diagram of multiuser MIMO sky line options;

Fig. 8 shows the schematic diagram of the multi-user being regarded as single MIMO transmitting terminal;

Fig. 9 shows the schematic diagram of the MIMO sending/receiving system that reconfigures;

Figure 10 is the schematic diagram that is used to explain according to the detection method principle of the embodiment of the invention; And

Figure 11 shows the flow chart according to each step of the MIMO multi-user test method of the embodiment of the invention.

Embodiment

Below in conjunction with accompanying drawing the present invention is specified.Be noted that described embodiment only is for illustrative purposes, rather than limitation of the scope of the invention.Described various numerical value is not to be used to limit the present invention, and these numerical value can carry out any suitable modification according to those of ordinary skills' needs.

Fig. 1 shows the schematic diagram of the example of honeycomb mimo system; Fig. 2 shows the schematic diagram of the example of many sub-districts; And Fig. 3 shows the schematic diagram of MIMO transmit-receive unit, and wherein Fig. 3 (a) is the schematic diagram of transmitting terminal, and Fig. 3 (b) is the schematic diagram of receiving terminal.

As shown in Figure 1, multiaerial system is used for cellular network, several antennas all is installed, communicate between user terminal and base station at base station BS end and user UE end.As shown in Figure 2, many cell mimos system can adopt the hexagon honeycomb shape, and six neighbor cells are arranged around each sub-district, and each base station covers a sub-district.

The taking into account system up link, each user terminal emitter is shown in Fig. 3 (a), the input bit code modulation module 302 that serial/parallel module 301 is input to each branch road of flowing through carries out chnnel coding, symbol-modulated, then emitting antenna selecting module 303 select according to certain condition wait to import the antenna that transmits after, transmit a signal to channel by these antenna.Base station receiving device is shown in Fig. 3 (b), received signal is admitted to signal detection module 304, isolate the signal of each antenna branch in this module, and these conversion of signals are serial output symbol stream, 305 pairs of symbols streams of demodulation coding module are carried out demodulation, bit stream is recovered in the decoding back.

User's transmitting terminal: carry out day line options to reduce presence of intercell interference

Adopt in the mimo system of space division multiplexing mode of operation,, make that channel matrix is that low-rank reduces its capacity owing to have mutual coupling between each bay.In conjunction with mimo channel matrix characteristic, carrying out the selection of emitting antenna selecting or reception antenna respectively is a kind of energy raising capacity and the effective technology that reduces system complexity.In the general sky line options technology, only consider the point-to-point multiaerial system of single user, reckon without the influence of presence of intercell interference in the cellular system.Under the actual cellular environment, need to consider the influence of interference, the antenna selecting method that following surface analysis carries out in considering the mimo system that disturbs between the sub-district to channel capacity.

If cellular system has K _CellIndividual sub-district, the base station end of Target cell i is installed N width of cloth antenna, and user terminal is equipped with M width of cloth antenna, is x if the user transmits _i, the channel gain matrix from user terminal to base station in the cell i is H _{I, i}If, do not consider the interference between the sub-district, then the base station termination is collected mail and number to be

y _i＝H _i，ix _i+n _i (1)

Received signal when considering to disturb between the sub-district is

$y_i=H_{i,i}{x}_i+\underset{j=1,i\≠j}{\overset{K_{\mathrm{cell}}}{\mathrm{\Σ}}}{H}_{j,i}{x}_j+n_i---\left(2\right)$

Here, x _jBe the interference signal from the user terminal in the j of sub-district, H _{J, i}Be the user terminal of sub-district j channel gain matrix to cell i base station end,

Be total interference, n _iBe noise.

The channel capacity of cell i is

$C_i={\log }_2\det (I_N+\frac{R_{i,i}}{R_{j,i}})---\left(3\right)$

In the formula, Be the covariance matrix of echo signal,

Be the poor battle array of disturbing of defencing jointly, (*) ^The pseudoinverse of representing matrix *.Whole honeycomb MIMO ofdm system average size is

$C_{\mathrm{av}}=\frac{\underset{i=1}{\overset{K_{\mathrm{cell}}}{\mathrm{\Σ}}}{C}_i}{K_{\mathrm{cell}}}---\left(4\right)$

By formula (3), (4) if increase the number of transmit antennas of Target cell, can improve the speed of Target cell as can be known, and the cochannel interference that other neighbor cells are caused simultaneously is big more, causes the reduction of power system capacity; Otherwise, if reduce the Target cell number of transmit antennas, will reduce the speed of Target cell, the cochannel that other neighbor cells are caused disturbs lessly simultaneously, can increase power system capacity.Therefore, need be rationally compromise between single sub-district speed and power system capacity.

Therefore, consider the relation of single sub-district speed and power system capacity, the present invention proposes a kind of antenna selecting method.Embodiment with reference to shown in Figure 4 carries out detailed explanation to antenna selecting method of the present invention.

Shown in Fig. 4 (a):

Inside, sub-district: adopt former multi-antenna structure.Because in inside, sub-district, the interference between the sub-district that user terminal is subjected to is lower, and a day line options can reduce transmission rate, so do not carry out emitting antenna selecting.

Cell boarder: adopt transmitting antenna to select technology.Though emitting antenna selecting has reduced the unique user transmission rate of space division multiplexing mimo system, reduced this user simultaneously the cochannel that neighbor cell causes has been disturbed, can obtain the honeycomb system capacity gain.

Here, cell boarder can utilize the signal to noise ratio E of pilot signal _c/ I _oDetermine, shown in Fig. 4 (b).User terminal measurement in the A sub-district to A district pilots signal to noise ratio be lower than rated value a1 and B district pilots signal to noise ratio is higher than rated value b1, promptly 1 (site1) locates in the position, simultaneously, user terminal measurement in the A sub-district to A district pilots signal to noise ratio be higher than rated value a2 and B district pilots signal to noise ratio is lower than rated value b2, promptly 2 (site2) locate in the position, then are the cell boarder place between the position 1～2.

During the user terminal emitting antenna selecting, reduced user rate, but user rate cross low then can not proper communication, so need under certain user rate constraints, select antenna number.To the space division multiplexing mimo system, number of transmit antennas and speed are linearly proportional, if transmitting antenna reduces half, then transmission rate reduces by one times.Thus, can be converted to antenna number constraint, the i.e. number of transmit antennas that user terminal should adopt at least to the rate constraint condition.Simultaneously,, require the selected antenna number of this user terminal to be lower than base station end antenna number for carrying out Multiuser Detection at the base station end, thus base station end antenna number as the upper bound.At last, should guarantee that also the antenna of selecting can obtain every sub-district maximum channel capacity.According to these principles, the antenna selection criterion of proposition is,

$\left\{\begin{array}{c}\max C_i\\ M_0^{\left(m\right)}\&le;M_{\mathrm{select}}^{\left(m\right)}\\ \underset{m}{\mathrm{\&Sigma;}}{M}_{\mathrm{select}}^{\left(m\right)}<M_{\mathrm{BS}}\end{array}\right.---\left(5\right)$

Here, M _Select ^(m)Be the selected antenna number of user m, M ₀ ^(m)Be the lower bound of the number of transmit antennas of user m, M _BSThe upper bound for the transmitting antenna sum.According to formula (3), (5), can be converted into channel capacity the determinant of signal calculated covariance matrix, the antenna selection criterion that obtains simplifying is:

$\left\{\begin{array}{c}(M,\underset{m}{\mathrm{\&Sigma;}}{M}_{\mathrm{select}}^{\left(m\right)})=\arg \max \det (I_n+\frac{R_{i,i}}{R_{j,j}})\\ M_0^{\left(m\right)}\&le;M_{\mathrm{select}}^{\left(m\right)}\\ s.t.\underset{m}{\mathrm{\&Sigma;}}{M}_{\mathrm{select}}^{\left(m\right)}<M_{\mathrm{BS}}\end{array}\right.---\left(6\right)$

That is,, from M width of cloth antenna, select according to the covariance matrix and the antenna constraints of signal

Width of cloth antenna.

Adopt enumerative technique to find the solution the constrained optimization problem of formula (6), to the system of arbitrary user and base station formation, implementation step such as Fig. 5 of day line options are described below,

In step 501,, choose all possible combination of antennas modes according to the total number of transmit antennas of mimo system and the upper and lower boundary of number of transmit antennas of setting

In step 502,, calculate the determinant of its covariance matrix to selected every class transmitting antenna mode

In step 503, select a kind of transmitting antenna compound mode of determinant maximum, as the user terminal antenna configuration mode.

Performance by analogue test checking proposition method has one to insert the user in the system of setting up departments, and user terminal and base station end are all installed 4 width of cloth antennas, and establishing user terminal transmitting antenna lower bound is 2 width of cloth, and then user's transmitting terminal has $\left(\begin{array}{c}2\\ 4\end{array}\right)$ The line options combination of class sky; The user is positioned at cell boarder, and the cochannel of taking into account between the sub-district disturbs, and wanted to interfering signal ratio is 5dB.Calculate the covariance matrix determinant under every class combination of antennas mode, the combination of antennas of correspondence was antenna 1 and 3 when its value was maximum, i.e. TX (1,3).Adopt system's average size such as Fig. 6 of this combination, can see, a day line options has improved system's ergodic capacity.

Base station receiving terminal: carry out the MIMO Multiuser Detection and disturb to reduce in the sub-district

After user terminal carries out day line options, be used to send the antenna amount minimizing of signal, as shown in Figure 7, user 1 antenna (U11#, U12#, U13#, U14#) after selecting, be (U11#, U12#), (U21# U22#) is (U21#) to user 2 antenna after selecting, user 3 antenna (U31#, U32#, U33# U34#) is (U32#) after selecting.Because the antenna sum of all user terminals is not more than base station end antenna number (according to bound constrained on the aforementioned antenna number (formula 5)), all users after the sky line options can be regarded as antenna transmission end more than, as the aforementioned antenna (U11# that selects, U12#, U21#, U32#) regard a new transmitting terminal as, as shown in Figure 8.Like this, transmitting terminal that rebuilds and original base station receiving terminal constitute a new MIMO communication system, as shown in Figure 9.Thus, can utilize the MIMO detection algorithm to carry out the MIMO Multiuser Detection.The advantage of MIMO Multiuser Detection is to have utilized a plurality of users' emission information simultaneously, and the detection of general Single User MIMO is regarding interference as from other users' signal.

For the mimo system of new configuration,, the present invention proposes a kind of by user's serial interference delete method for recovering subscriber signal from the base station end.The execution mode of this method as shown in figure 10, at first, detect the highest user of average signal-to-noise ratio, because these users' signal is stronger, interference to other users is also serious more, if detect the strong user of signal earlier and delete it from received signal, then this subscriber signal is less to the influence of other subscriber signals.And, because the user terminal of selecting may have the one or more transmitting antenna after the sky line options, all transmitting antenna signals of user terminal are handled simultaneously, be more convenient for to the control of subscriber signal.Then, all transmitting antenna signals to selected user, adopt general serial interference delete detection method (VBLAST), promptly recover the high antenna end signal of signal to noise ratio earlier, from received signal, delete the signal that has recovered then, detect next width of cloth antenna end signal again, carry out iteration, recover up to the signal of finishing all transmitting antennas.At last, next user that average signal-to-noise ratio is taken second place adopts above-mentioned interference delete method restoring signal.

Figure 11 shows the flow chart according to each step of MIMO multi-user test method of the present invention.

At step 111 (initialization step), user u ∈ to be detected [1, U], user number counting cu=1; The channel matrix of user terminal to base station end is

The pseudo inverse matrix of H is designated as Base station termination collection of letters y.

In step 112, the antenna number of user u $m_u\&Element;[1,M_{\mathrm{select}}^u],$ And antenna counting ca=1.In step 113, the mould ‖ (G of the every row of compute matrix G _n) _Mselect‖, the corresponding different user different antennae of the mould value of the every row of this matrix end detects the contrary of back signal to noise ratio, and the mould value is more little, and it is high more to detect the back signal to noise ratio, and the highest principle of average signal-to-noise ratio after detecting by each user terminal is determined current detection user u.

For example, under the situation of 3 user terminals, first user terminal u1 adopts the emission of 2 width of cloth antennas, and (u2 u3) adopts the emission of 1 width of cloth antenna to all the other two user terminals, and their corresponding moulds are respectively (‖ (G _n) ‖ _U1,1, ‖ (G _n) ‖ _U1,2), ‖ (G _n) ‖ _U2, ‖ (G _n) ‖ _U3Mould to first user terminal is averaged ${\left|\right|\left(G_n\right)\left|\right|}_{u1}^{\mathrm{av}}=({\left|\right|\left(G_n\right)\left|\right|}_{u\mathrm{1,1}}+{\left|\right|\left(G_n\right)\left|\right|}_{u\mathrm{1,2}})/2,$ Compare ‖ (G _n) ‖ _U1 ^Av, ‖ (G _n) ‖ _U2, ‖ (G _n) ‖ _U3Size, if ${\left|\right|\left(G_n\right)\left|\right|}_{u1}^{\mathrm{av}}<{\left|\right|\left(G_n\right)\left|\right|}_{u2}<{\left|\right|\left(G_n\right)\left|\right|}_{u3},$ Determine that then user terminal to be detected is u1.

In step 114,, judge whether it has several transmitting antennas through after the emitting antenna selecting to user terminal u to be detected.

If as the judged result of step 114,1 width of cloth transmitting antenna is only arranged, flow process forwards step 116 to; If as the judged result of step 114, several transmitting antennas are arranged, flow process is execution in step 115 then, chooses the antenna of this user terminal and the channel matrix between the base station, and calculate this matrix pseudoinverse and obtain matrix G, and the mould ‖ (G of all row of compute matrix G _n) ‖ _u, and select the corresponding antenna of the less row of mould value as antenna m to be detected _u

For example, the (‖ (G that compares two width of cloth antenna branch correspondences of user terminal 1 _n) ‖ _U1,1, ‖ (G _n) ‖ _U1,2) size, if ‖ (G _n) ‖ _U1,1＜‖ (G _n) ‖ _U1,2, then determine first width of cloth antenna of detection user terminal u1 earlier.

In step 116, get and antenna m to be detected _uThe row vector of corresponding G matrix correspondence, it as zero setting vector w _Mu

In step 117, utilize this zero setting vector zero setting to received signal: $y_{m_u}=w_{m_u}^{T}y$ (" T " represents matrix transpose operation), obtain and m through demodulation _uThe emission symbol of width of cloth antenna correspondence In step 118, upgrade received signal, i.e. the antenna m of the user terminal u that deletion has recovered from received signal _uThe signal of end:

(H) m wherein _uIt is the channel fading coefficient vector of the m width of cloth antenna of user terminal u.

In step 119, upgrade G, i.e. deletion antenna m from the H matrix _uCorresponding row (this row zero setting) obtains matrix Calculating its pseudoinverse obtains

In step 1110, upgrade the antenna counting ca=ca+1 of user u.

At determining step 1111, with ca and M _Select ^uCompare, if $\mathrm{ca}<M_{\mathrm{select}}^u,$ Flow process then forwards step 115 to, otherwise forwards step 1112 to.

In step 1112, upgrade user number counting cu=cu+1.

At determining step 1113, cu and U are compared, if cu＜U forwards step 112 to, otherwise finish.

Thus, finally realized each user's signal is recovered.

Although illustrated and described the present invention at exemplary embodiments, will be understood 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, the present invention is not limited to above-mentioned particular instance, and should be defined by the following claims.

Claims (10)

1, a kind of emitting antenna selecting method is used for reducing the minizone/interior interference of multi-user multi-aerial system, may further comprise the steps:

Judge whether user terminal is in cell edge;

When user terminal is in cell edge, according to predetermined transmission rate constraints, the antenna number of base station end, so that the mode of the subscriber channel capacity maximum of described sub-district, the transmitting antenna of selection user terminal.

2, antenna selecting method according to claim 1 is characterized in that the signal to noise ratio according to pilot signal, determines whether user terminal is in cell edge.

3, antenna selecting method according to claim 1 and 2 is characterized in that determining the lower limit of user terminal number of transmit antennas according to predetermined transmission rate constraints.

4, according to the described antenna selecting method of one of aforementioned claim, it is characterized in that determinant, determine the subscriber channel capacity of described sub-district according to the covariance matrix of selected transmitting antenna.

5, antenna selecting method according to claim 4 is characterized in that selecting the step of the transmitting antenna of user terminal to comprise:

According to the lower limit of user terminal number of transmit antennas, by the upper limit of the definite user terminal number of transmit antennas of the antenna number of base station end, choose all possible user terminal emitting antenna combination mode;

At every kind of selected emitting antenna combination mode, calculate the determinant of its covariance matrix; And

Select the emitting antenna combination mode of its determinant maximum, as the configuration mode of user terminal transmitting antenna.

6, a kind of signal recovery method is used for carrying out serial interference delete by user ground, is applied to multi-user multi-aerial system, and in each sub-district of described system, the antenna number of base station said method comprising the steps of more than or equal to the antenna sum of user terminal:

The user terminal selecting step according to channel matrix, is selected the highest user terminal of average signal-to-noise ratio, as the current detection user terminal;

It line options step judges whether the current detection user terminal has several transmitting antennas, if having several transmitting antennas, then, select the highest antenna of signal to noise ratio, as antenna to be detected according to channel matrix, if have only a width of cloth transmitting antenna, then choose this antenna, as antenna to be detected;

The signal recovering step is utilized the zero setting vector corresponding with antenna to be detected, recovers the data corresponding with antenna to be detected;

Step of updating, the signal on the antenna to be detected that deletion has recovered from received signal is to upgrade received signal and to delete the row corresponding with antenna to be detected to upgrade channel matrix from channel matrix;

The antenna determining step judges whether whole transmitting antennas of current detection user terminal have been carried out the signal recovery, if judged result negate, then return a day line options step, select next antenna to be detected;

The user terminal determining step judges whether whole user terminals to have been carried out the signal recovery, if judged result negates then to return the user terminal selecting step; Otherwise the signal of having finished whole user terminals recovers.

7, signal recovery method according to claim 6 is characterized in that described user terminal selecting step comprises:

The pseudoinverse of calculating channel matrix obtains pseudo inverse matrix, and each row of pseudo inverse matrix is corresponding to the respective antenna end of relative users terminal;

Calculate the mould value of each row of pseudo inverse matrix;

At each user terminal, calculate in the pseudo inverse matrix, with the mean value of the mould value of the corresponding row of whole transmitting antennas of this user terminal; And

Select the user terminal of the mean value minimum of mould value, as the current detection user terminal.

8, signal recovery method according to claim 6 is characterized in that described day line options step comprises:

The pseudoinverse of calculating channel matrix obtains pseudo inverse matrix, and each row of pseudo inverse matrix is corresponding to the respective antenna end of relative users terminal;

At the current detection user terminal, calculate in the pseudo inverse matrix, with the mould value of the corresponding row of whole transmitting antennas of this user terminal; And

Select the transmitting antenna of mould value minimum, as antenna to be detected.

9, signal recovery method according to claim 7 is characterized in that described day line options step comprises:

At the current detection user terminal, select in the pseudo inverse matrix, with the mould value of the corresponding row of whole transmitting antennas of this user terminal in, the transmitting antenna of mould value minimum, as antenna to be detected.

10, the up transmission-receiving handling method of a kind of multi-user multi-antenna, be used for reducing the minizone/interior interference of multi-user multi-aerial system, in each sub-district of described system, the antenna number of base station is more than or equal to the antenna sum of user terminal, and described method comprises:

User terminal carries out emitting antenna selecting according to the described emitting antenna selecting method of one of claim 1 to 5, and sends data-signal by selected transmitting antenna to the base station;

The data-signal that is sended over by user terminal is recovered according to the described signal recovery method of one of claim 6 to 9 in the base station.

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