CN101997653A - User equipment pairing method in virtual multi-input multi-output (MIMO) system and base station - Google Patents

Abstract

The invention discloses a user equipment pairing method which comprises the following steps: acquiring space characteristic graphs of all users, and dividing all the users into two parts according to the amplitudes of the space characteristic graphs; generating a first paired user in the alternate mode of all users, and updating the existing paired user set; as for the candidate paired user set, selecting a new candidate paired user set by using the existing semi-orthogonal pairing method, if the new candidate paired user set is not empty and the amplitude of the first paired user is small, selecting new paired users for all users in the new candidate paired user set according to the weighting standard of the inverse selection method, updating the existing paired user set, and returning to the step of selecting a candidate paired user set until the constraint on the number of receiving antennae of the base station is satisfied or the new candidate paired user set is empty; and executing data transmission by a virtual MIMO system constituted by the users in the existing paired user set and the base station. The invention also provides a base station which is used for realizing the user equipment pairing method.

Description

Subscriber equipment matching method and base station in the virtual multiple input multiple output

Technical field

The present invention relates to multiple-input and multiple-output (MIMO) technical field of radio communication, specifically is that the Partial Inverse in a kind of virtual multiple-input and multiple-output (MIMO) system is selected semi-orthogonal subscriber equipment matching method and a kind of base station that is used to realize above-mentioned subscriber equipment matching method.

Background technology

Multiple-input and multiple-output (MIMO) technology can effectively strengthen the frequency spectrum service efficiency of Radio Link, is the support technology of new generation of wireless communication system.Yet, be limited to factors such as cost, volume and power, at the subscriber equipment end comparatively difficulty of many antennas is installed.3G (Third Generation) Moblie partner program Long Term Evolution project motion R1-0501162 (3GPP TSG-RAN1, R1-0501162, " ULvirtual MIMO transmission for E-UTRA; " San Diego, USA Oct.2005) has proposed a kind of virtual MIMO technology, and a plurality of subscriber equipmenies that will have single antenna combine, in same Resource Block, unite to base station transmission data, form virtual mimo channel with many antennas.

One of key problem of virtual MIMO technology is the subscriber equipment pairing, promptly when the system customer equipment number is many, the user device set of how effectively to select to carry out virtual MIMO communication to improve overall system throughput, is taken into account the fairness between the subscriber equipment simultaneously again.3G (Third Generation) Moblie partner program Long Term Evolution project motion R1-051422 (3GPP TSG-RAN1, R1-051422, " UL virtual MIMO system level performance evaluation for E-UTRA; " Seoul, Korea Nov.2005) has provided pairing scheme at two subscriber equipmenies.

Present user device quantity mainly contains 3G (Third Generation) Moblie partner program Long Term Evolution project motion R1-051422 (3GPP TSG-RAN1 more than 2 pairing scheme, R1-051422, " ULvirtual MIMO system level performance evaluation for E-UTRA; " Seoul, Korea, Nov.2005) random pair of Ti Chuing and T.Yoo and A.Goldsmith are at article " On the Optimality of Multiantenna Broadcast Scheduling using Zero-Forcing Beamforming " (IEEE Journal on Selected Areas in Communications, vol.24, no.3,2006, pp.528-541) the middle semi-orthogonal pairing that proposes.

The random pair method constitutes virtual MIMO system by selecting the pairing subscriber equipment at random, and realization is simple, and computation complexity is low; But when pairing subscriber equipment space characteristics figure orthogonality difference, the subscriber equipment phase mutual interference of pairing causes throughput of system low, thereby does not give full play to the potentiality of virtual MIMO technology.

The semi-orthogonal matching method with the space characteristics figure orthogonality of space characteristics figure and existing pairing subscriber equipment preferably subscriber equipment as candidate user devices, calculate each candidate user devices space characteristics figure and open into the space mould value of the component of quadrature mutually with existing pairing subscriber equipment space characteristics figure, select the subscriber equipment of this mould value maximum to match, thereby reach the purpose that improves overall system throughput; But, there is the fairness defective in this matching method: for the less subscriber equipment of space characteristics artwork value own, its quadrature component is littler, and when other subscriber equipment matched subscriber equipment as first, this subscriber equipment was difficult to be chosen as the pairing subscriber equipment and participates in communication; And when this subscriber equipment oneself matches subscriber equipment as first, because the space characteristics artwork value of the subscriber equipment of pairing is all bigger with it, thereby the interference that brings is also bigger, this subscriber equipment received signal to noise ratio is reduced, these two reasons all can cause the throughput of this subscriber equipment to descend, sometimes even also poorer, and this is difficult to accept in the virtual MIMO communication system than not participating in virtual MIMO when communication.

Summary of the invention

The present invention is based on T.Yoo and A.Goldsmith at article " On the Optimality of Multiantenna Broadcast Scheduling using Zero-Forcing Beamforming " (IEEE Journal on Selected Areas in Communications, vol.24, no.3,2006, pp.528-541) the semi-orthogonal subscriber equipment matching method that proposes in, propose a kind of Partial Inverse and selected semi-orthogonal subscriber equipment matching method, the subscriber equipment that will have single antenna is divided into two parts according to its mould value size with respect to the space characteristics figure of the base station with many antennas, the certain customers equipment big to the mould value adopts the existing semi-orthogonal subscriber equipment matching method that T.Yoo and A.Goldsmith proposed, and the Partial Inverse that the little certain customers' equipment of mould value adopts the present invention to propose is selected semi-orthogonal subscriber equipment matching method.

According to first scheme of the present invention, a kind of subscriber equipment matching method has been proposed, comprising:

In a dispatching cycle, obtain the space characteristics figure h of K subscriber equipment _i, 1≤i≤K, S ₁The mould value of representing space characteristic pattern in K the subscriber equipment || h _i|| less than the set that the sequence number of the subscriber equipment of first predetermined threshold value is formed, S ₀The existing pairing of expression user device set, T _iThe expression candidate matches user device set, order T ₁=1,2 ..., K};

At the current time slots in this dispatching cycle, the mode of taking turns according to all K subscriber equipment produces first pairing subscriber equipment π (1) at current time slots, upgrades existing pairing user device set: S ₀={ π (1) }, and get g ₍₁₎=h _{π (1)}, i=2;

Match user device set T from the candidate _I-1In, select space characteristics figure h _kSpace characteristics figure h with selected pairing subscriber equipment π (i-1) of the last time _{π (i-1)}The component g of the space phase quadrature of being opened with respect to the space characteristics figure of previous pairing subscriber equipment _(i-1)Orthogonality satisfies those subscriber equipmenies of the second predetermined threshold value α, matches user device set as new candidate, promptly

$T_i=\{k\&Element;T_{i-1},k\&NotEqual;\mathrm{\&pi;}(i-1)|\frac{\left|h_k^H{g}_{(i-1)}\right|}{\left|\right|h_k\left|\right|\left|\right|g_{(i-1)\left|\right|}}<\mathrm{\&alpha;}\};$

If

And π (1) ∈ S ₁, then the candidate is matched user device set T _iIn each subscriber equipment k ∈ T _i, according to by existing pairing user device set S ₀In each subscriber equipment j ∈ S ₀The space characteristics figure space of being opened, calculate one by one

$l_k=\frac{P_k\underset{j=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{\left|h_k^H{g}_{\left(j\right)}\right|}^2}{1+\frac{P_k}{{\mathrm{<figure-callout\; id="0"\; label="N"\; filenames="H2009101664437E0000021.png,H2009101664437E0000041.png"\; state="\{\{state\}\}">N</figure-callout>}}_0}{\left|\right|h_k\left|\right|}^2},$

Selection makes l _kMinimum subscriber equipment

As new pairing subscriber equipment, upgrade existing pairing user device set: S ₀← S ₀∪ { π (i) }, and get g _(i)=h _{π (i)}And

If

Perhaps existing pairing user device set S ₀In the number of subscriber equipment | S ₀| equal the sum M of the reception antenna of base station, then existing pairing user device set S ₀In subscriber equipment and base station form virtual multiple-input-multiple-output communication system, carry out the transfer of data of current time slots.

Preferably, described subscriber equipment matching method also comprises:

If But

Then the candidate is matched user device set T _iIn each subscriber equipment k ∈ T _i, calculate one by one with by existing pairing user device set S ₀In each subscriber equipment j ∈ S ₀The component of the space phase quadrature opened of space characteristics figure

Selection makes || g _k|| maximum subscriber equipment As new pairing subscriber equipment, upgrade existing pairing user device set: S ₀← S ₀∪ { π (i) }, and get g _(i)=g _{π (i)}

Preferably, described subscriber equipment matching method also comprises:

If existing pairing user device set S ₀In the number of subscriber equipment | S ₀| less than the sum M of the reception antenna of base station, then upgrade subscriber equipment counting i ← i+1, return the candidate and match user device set T _iChoose step.

Preferably, at upstream data communication, to existing pairing user device set S ₀In subscriber equipment carry out constant power and distribute, subscriber equipment is united to the base station and is sent data; And the base station receives the signal that each subscriber equipment sends with the linear minimum mean-squared error receiver.

Preferably, at downlink data communication, with above-mentioned existing pairing user device set S ₀In the number of subscriber equipment | S ₀| and relatively being converted between the sum M of the reception antenna of base station has pairing user device set S ₀In the number of subscriber equipment | S ₀| and the comparison between the total Q of the transmitting antenna of base station; And at downlink data communication, to sending to existing pairing user device set S ₀In the data of subscriber equipment carry out constant power and distribute; Space characteristics figure according to each subscriber equipment carries out transmit beam-forming to sending data; And will send to subscriber equipment through the data of transmit beam-forming.

Preferably, after finishing the transfer of data of current time slots, produce first pairing subscriber equipment π (1) at next time slot; And after the transfer of data of all time slots in finishing current dispatching cycle, regain the space characteristics figure h of the individual subscriber equipment of K ' _i, 1≤i≤K '.

Preferably, the space characteristics figure h of subscriber equipment _iBe to obtain by the reference signal that subscriber equipment sends.

Preferably, use the Round-Robin dispatching method, produce first pairing subscriber equipment π (1) at current time slots.

According to alternative plan of the present invention, a kind of base station has been proposed, comprising:

Space characteristics figure deriving means was used in a dispatching cycle, obtained the space characteristics figure h of K subscriber equipment _i, 1≤i≤K, S ₁The mould value of representing space characteristic pattern in K the subscriber equipment || h _i|| less than the set that the sequence number of the subscriber equipment of first predetermined threshold value is formed, S ₀The existing pairing of expression user device set, T _iThe expression candidate matches user device set, order

T ₁=1,2 ..., K};

Pairing subscriber equipment generation device is used at the current time slots in this dispatching cycle, and the mode of taking turns according to all K subscriber equipment produces first pairing subscriber equipment π (1) at current time slots, upgrades existing user device set: the S of pairing ₀={ π (1) }, and get g ₍₁₎=h _{π (1)}, i=2;

The candidate matches the user device set choice device, is used for matching user device set T from the candidate _I-1In, select space characteristics figure h _kSpace characteristics figure h with selected pairing subscriber equipment π (i-1) of the last time _{π (i-1)}The component g of the space phase quadrature of being opened with respect to the space characteristics figure of previous pairing subscriber equipment _(i-1)Orthogonality satisfies those subscriber equipmenies of the second predetermined threshold value α, matches user device set T as new candidate _i, promptly

$T_i=\{k\&Element;T_{i-1},k\&NotEqual;\mathrm{\&pi;}(i-1)|\frac{\left|h_k^H{g}_{(i-1)}\right|}{\left|\right|h_k\left|\right|\left|\right|g_{(i-1)\left|\right|}}<\mathrm{\&alpha;}\};$

Pairing subscriber equipment choice device is used for

And π (1) ∈ S ₁The time, the candidate is matched user device set T _iIn each subscriber equipment k ∈ T _i, according to by existing pairing user device set S ₀In each subscriber equipment j ∈ S ₀The space characteristics figure space of being opened, calculate one by one

$l_k=\frac{P_k\underset{j=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{\left|h_k^H{g}_{\left(j\right)}\right|}^2}{1+\frac{P_k}{{\mathrm{<figure-callout\; id="0"\; label="N"\; filenames="H2009101664437E0000021.png,H2009101664437E0000041.png"\; state="\{\{state\}\}">N</figure-callout>}}_0}{\left|\right|h_k\left|\right|}^2},$

Selection makes l _k-little subscriber equipment

As new pairing subscriber equipment, upgrade existing pairing user device set: S ₀← S ₀∪ { π (i) }, and get g _(i)=h _{π (i)}And

Data transmission device is used for Perhaps existing pairing user device set S ₀In the number of subscriber equipment | S ₀| when equaling the sum M of reception antenna of base station, with existing pairing user device set S ₀In subscriber equipment form virtual multiple-input-multiple-output communication system, carry out the transfer of data of current time slots.

Preferably, pairing subscriber equipment choice device also is used for

But

The time, the candidate is matched user device set T _iIn each subscriber equipment k ∈ T _i, calculate one by one with by existing pairing user device set S ₀In each subscriber equipment j ∈ S ₀The component of the space phase quadrature opened of space characteristics figure

Selection makes || g _k|| maximum subscriber equipment

As new pairing subscriber equipment, upgrade existing pairing user device set: S ₀← S ₀∪ { π (i) }, and get g _(i)=g _{π (i)}

Preferably, the candidate matches the user device set choice device and also is used at existing pairing user device set S ₀In the number of subscriber equipment | S ₀| during less than the sum M of the reception antenna of base station, upgrade subscriber equipment counting i ← i+1, choose new candidate and match user device set T _i

Preferably, at upstream data communication, data transmission device receives the signal that each subscriber equipment sends with the linear minimum mean-squared error receiver.

Preferably, at downlink data communication, in above-mentioned candidate matches user device set choice device and above-mentioned data transmission device, will have pairing user device set S ₀In the number of subscriber equipment | S ₀| and relatively being converted between the sum M of the reception antenna of base station has pairing user device set S ₀In the number of subscriber equipment | S ₀| and the comparison between the total Q of the transmitting antenna of base station; And at downlink data communication, data transmission device is to sending to existing pairing user device set S ₀In the data of subscriber equipment carry out constant power and distribute; Space characteristics figure according to each subscriber equipment carries out transmit beam-forming to sending data; And will send to subscriber equipment through the data of transmit beam-forming.

Preferably, after finishing the transfer of data of current time slots, pairing subscriber equipment generation device produces first pairing subscriber equipment π (1) at next time slot; And after the transfer of data of all time slots in finishing current dispatching cycle, space characteristics figure deriving means regains the space characteristics figure h of the individual subscriber equipment of K ' _i, 1≤i≤K '.

Preferably, space characteristics figure deriving means obtains the space characteristics figure h of subscriber equipment according to the reference signal of subscriber equipment transmission _i

Preferably, pairing subscriber equipment generation device uses the Round-Robin dispatching method, produces first pairing subscriber equipment π (1) at current time slots.

The invention has the advantages that:, can make its throughput in this virtual MIMO communication bigger the situation of the less subscriber equipment of space characteristics artwork value as first pairing subscriber equipment; In addition, when the less subscriber equipment of space characteristics artwork value matches subscriber equipment as first, the less subscriber equipment of other mould value has also obtained the selected combinations of pairs of more opportunity, has participated in communication, thereby improve the throughput of this part subscriber equipment, make the fairness of different user devices throughput better.

Description of drawings

Below by the accompanying drawings embodiments of the invention, with foregoing of the present invention and other purpose, the more clear statement of feature and advantage, wherein:

Figure 1 shows that the schematic diagram of virtual MIMO system.

Fig. 2 shows the flow chart that selects semi-orthogonal subscriber equipment matching method according to the Partial Inverse in virtual multiple-input and multiple-output of the present invention (MIMO) system.

Fig. 3 shows the schematic block diagram according to base station 300 of the present invention.

Figure 4 shows that in the virtual MIMO system after 10000 dispatching cycles the value (according to descending ordering) of each subscriber equipment average throughput under difference pairing scheme in average each dispatching cycle.

Figure 5 shows that the comparison of the overall system throughput of various pairing schemes in the average dispatching cycle.

Embodiment

To a preferred embodiment of the present invention will be described in detail, having omitted in the description process is unnecessary details and function for the present invention with reference to the accompanying drawings, obscures to prevent that the understanding of the present invention from causing.

At length set forth performing step of the present invention for clear, provide some specific embodiments of the invention below, be applicable to wireless MIMO communication system.Need to prove, the invention is not restricted to the application described in the embodiment, but applicable to other wireless communication systems.

According to embodiments of the invention, the Partial Inverse that is proposed selects semi-orthogonal subscriber equipment matching method specifically may further comprise the steps.

Step 1: in a dispatching cycle, the base station obtains the space characteristics figure (reference signal that sends by subscriber equipment obtains) of each subscriber equipment, and with the mould value size separated into two parts of all subscriber equipmenies according to its space characteristics figure, the existing pairing of order user device set be a sky, and it is all user device set that the candidate matches user device set;

Step 2: at the current time slots in this dispatching cycle, the mode of taking turns according to all subscriber equipmenies produces first pairing subscriber equipment at this time slot, upgrades existing pairing user device set.If first pairing subscriber equipment does not belong to the less part of mould value of space characteristics figure, then make base station configuration amount FLAG=0, otherwise, make base station configuration amount FLAG=1;

Step 3: the candidate is matched user device set, the employing existing half positive subscriber equipment mating that T.Yoo and A.Goldsmith proposed is to method, select new candidate and match user device set,, then change step 4 if described new candidate matches user device set non-NULL and FLAG=0; If described new candidate matches user device set non-NULL and FLAG=1, then change step 5; If it is empty set that described new candidate matches user device set, then change step 6;

Step 4: described new candidate is matched each subscriber equipment in the user device set, the employing existing half positive subscriber equipment mating that T.Yoo and A.Goldsmith proposed is to method, select new pairing subscriber equipment, upgrade existing pairing user device set.If the number of the subscriber equipment in the existing pairing user device set is then got back to step 3 less than the sum of the reception antenna of base station, otherwise changes step 6;

Step 5: described new candidate is matched each subscriber equipment in the user device set,, select new pairing subscriber equipment, upgrade existing pairing user device set according to the contrary weighing criteria that selects method proposed by the invention.If the number of the subscriber equipment in the existing pairing user device set is then got back to step 3 less than the sum of the reception antenna of base station, otherwise changes step 6;

Step 6: the virtual MIMO communication system is formed in subscriber equipment and base station in the existing pairing user device set, carries out the transfer of data of current time slots.After finishing the transfer of data of current time slots, return step 2, carry out subscriber equipment pairing at next time slot.

After the transfer of data of all time slots in finishing current dispatching cycle, return step 1, regain the space characteristics figure (reference signal that sends by subscriber equipment obtains) of each subscriber equipment.

Below, will above-mentioned steps further be explained in conjunction with Fig. 2 and mathematic sign.

Fig. 2 shows the flow chart that selects semi-orthogonal subscriber equipment matching method according to the Partial Inverse in virtual multiple-input and multiple-output of the present invention (MIMO) system.

Step 1: in a dispatching cycle, the base station obtains the space characteristics figure h of K subscriber equipment in the sub-district _i(1≤i≤K) (reference signal that sends by subscriber equipment obtains) used S ₁The mould value of representing space characteristic pattern in K the subscriber equipment || h _i|| (1≤i≤K) the set of the sequence number composition of less that part of subscriber equipment; The antenna number of each subscriber equipment is 1 (generally speaking, described antenna promptly is that reception antenna is again a transmitting antenna), and subscriber equipment end transmit power constraint is P _Total, the antenna number of base station is M (generally speaking, described antenna promptly is that reception antenna is again a transmitting antenna), base station end transmit power constraint is P _Total-BS, then the maximum user device quantity supported simultaneously of system also is M, the sequence number of i the pairing subscriber equipment that π (i) expression is selected, π (i) ∈ 1,2 ..., K}, 1≤i≤M.S ₀The existing pairing of expression user device set, T _iThe expression candidate matches user device set (1≤i≤M), order

T ₁=1,2 ..., K};

Step 2: at the current time slots in this dispatching cycle, use Round-Robin dispatching method generation first pairing subscriber equipment at this time slot, its sequence number is designated as π (1), upgrades existing pairing user device set: S ₀={ π (1) }, and make g ₍₁₎=h _{π (1)}, make i=2, if first pairing subscriber equipment does not belong to the less part of mould value of space characteristics figure, promptly Then make base station configuration amount FLAG=0, otherwise, base station configuration amount FLAG=1 made;

Step 3: match user device set T from the candidate _I-1In, select space characteristics figure h _kSpace characteristics figure h with selected pairing subscriber equipment π (i-1) of the last time _{π (i-1)}The component g of the space phase quadrature of being opened with respect to the space characteristics figure of previous pairing subscriber equipment _(i-1)Orthogonality is those subscriber equipmenies preferably, match user device set as new candidate, promptly

$T_i=\{k\&Element;T_{i-1},k\&NotEqual;\mathrm{\&pi;}(i-1)|\frac{\left|h_k^H{g}_{(i-1)}\right|}{\left|\right|h_k\left|\right|\left|\right|g_{(i-1)\left|\right|}}<\mathrm{\&alpha;}\};$

If T _iNon-NULL and FLAG=0 then change step 4; If T _iNon-NULL and FLAG=1 then change step 5; If T _iBe empty set, then change step 6;

Step 4: the candidate is matched each subscriber equipment k ∈ T in the user device set _i, the space that the space characteristics figure of each the subscriber equipment j in calculating it one by one and having the pairing user device set is opened is the component g of quadrature mutually _k,

$g_k=h_k-\underset{j=1}{\overset{i-1}{\mathrm{\&Sigma;}}}\frac{h_k^H{g}_{\left(j\right)}}{{\left|\right|g_{\left(j\right)}\left|\right|}^2}{g}_{\left(j\right)},$

Selection makes || g _k|| maximum subscriber equipment is as new pairing subscriber equipment, promptly

Upgrade existing pairing user device set: S ₀← S ₀∪ { π (i) }, and make g _(i)=g _{π (i)}If the number of the subscriber equipment in the existing pairing user device set is less than the sum of the reception antenna of base station, promptly | S ₀|＜M, then make i=i+1, get back to step 3, otherwise change step 6;

Step 5: the candidate is matched each subscriber equipment k ∈ T in the user device set _i,, calculate l according to the contrary weighing criteria that selects method _k,

$l_k=\frac{P_k\underset{j=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{\left|h_k^H{g}_{\left(j\right)}\right|}^2}{1+\frac{{\mathrm{<figure-callout\; id="0"\; label="P\; k\; N"\; filenames="H2009101664437E0000021.png,H2009101664437E0000041.png"\; state="\{\{state\}\}">P</figure-callout>}}_k}{N_{}}{\left|\right|h_k\left|\right|}^2},$

Selection makes l _kMinimum subscriber equipment is as new pairing subscriber equipment, promptly

Upgrade existing pairing user device set: S ₀← S ₀∪ { π (i) }, and make g _(i)=h _{π (i)}If the number of the subscriber equipment in the existing pairing user device set is less than the sum of the reception antenna of base station, promptly | S ₀|＜M, then make i=i+1, get back to step 3, otherwise change step 6;

Step 6: in up-link, (N≤M) carrying out constant power distributes, and the transmitting power of each subscriber equipment is P to N subscriber equipment in the existing pairing user device set _Total/ N forms virtual MIMO system, unites to the base station to send data.The base station receives the signal that each subscriber equipment sends with linear minimum mean-squared error (MMSE) receiver, thereby finishes a virtual MIMO communication.

Similarly, in downlink system, in step 3 and step 5, (though in this manual, the number of transmit antennas of base station is identical with the reception antenna number according to the sum M of the transmitting antenna of base station, but in actual applications, the number of transmit antennas of base station also can be different with the reception antenna number, and for example, the base station can have M root reception antenna and Q transmit antennas, M ≠ Q), determine whether to jump to step 6.Like this, in step 6, (data of N≤M) are carried out the constant power distribution, are P at the transmitting power of each subscriber equipment to sending to N subscriber equipment in the existing pairing user device set _Total-BS/ N, and carry out transmit beam-forming to sending data according to the space characteristics figure of N subscriber equipment, will send to subscriber equipment through the data of transmit beam-forming then, thereby finish a virtual MIMO communication.

After finishing the transfer of data of current time slots, return step 2, carry out subscriber equipment pairing at next time slot.

After the transfer of data of all time slots in finishing current dispatching cycle, return step 1, regain the space characteristics figure h of the individual subscriber equipment of K ' in the sub-district _i(at this moment, the user device quantity in the sub-district may change (1≤i≤K ') (reference signal that sends by subscriber equipment obtains) ).

Next, select semi-orthogonal subscriber equipment matching side ratio juris to be described in detail to the Partial Inverse in the virtual MIMO system proposed by the invention.

(1) up virtual MIMO system model

Figure 1 shows that the schematic diagram of virtual MIMO system.

As shown in Figure 1, consider the up virtual MIMO system in arrowband, a single sub-district, comprise a base station and K subscriber equipment.The base station is equipped with M root antenna, and each subscriber equipment is equipped with an antenna, supposes M≤K.Base station dispatcher is selected N subscriber equipment from this K subscriber equipment, form N jointly with the base station and send out the virtual MIMO channel that M receives.When N≤M, this N subscriber equipment can insert (SDMA) by space division multiple access and share time-frequency resources.At the base station end, the baseband receiving signals vector can be expressed as

$y\left[m\right]=\underset{i=1}{\overset{K}{\mathrm{\&Sigma;}}}{h}_i\left[m\right]\&CenterDot;\sqrt{P_i\left[m\right]}\&CenterDot;x_i\left[m\right]+w\left[m\right]---\left(1\right)$

In the formula:

Represent the transmission data of i subscriber equipment at moment m, | x _i[m] |=1; Represent the transmitting power of i subscriber equipment, do not participate in communication, then P if i subscriber equipment is chosen as the pairing subscriber equipment at moment m at moment m _i[m]=0, otherwise P _i[m]＞0, and the power of all subscriber equipmenies satisfies constraints

P wherein _TotalExpression subscriber equipment end sends gross power;

Expression base station end is at the received signal vector of moment m;

Be illustrated in the being added with property white Gaussian noise of m constantly, its average is 0, and E{w[m] (w[m]) ^H}=N ₀I, I representation unit matrix here, E{} represents mathematic expectaion, () ^HThe expression conjugate transpose, promptly mutually uncorrelated the and variance of the noise component(s) of each reception antenna is N ₀

Be the space characteristics figure of i subscriber equipment at moment m, () here ^TThe expression transposition, Be the large scale propagation power attenuation coefficient of i subscriber equipment, large scale propagation effects such as reflection path loss and shade;

The transmitting antenna that is illustrated in constantly m, an i subscriber equipment is to the small scale propagation channel attenuation coefficient between the j root reception antenna of base station, can be modeled as that independently circulation is symmetrical answers Gaussian random variable, and average is 0, and variance is 1.

Suppose to adopt linear minimum mean-squared error (MMSE) receiver at receiving terminal.Suppose that base station receiver can obtain complete channel condition information, i.e. the space characteristics figure h of all subscriber equipmenies _i[m] (i=1,2 ..., K) can both accurately be known by the base station.Suppose in virtual MIMO, to adopt substep to select the matching method of subscriber equipment, wherein first subscriber equipment adopts the Round-Robin scheduling, promptly the 1st to K subscriber equipment taken turns a circle like this and is called a dispatching cycle in turn as first pairing subscriber equipment, goes round and begins again.Further suppose all h in a dispatching cycle _i[m] (i=1,2 ..., K) remaining unchanged (hereinafter is designated as h _i), and when the new cycle begins, h _i[m] (i=1,2 ..., K) get one group of new random value.

(2) contrary apolegamy is to scheme

In step 5, the candidate is matched each subscriber equipment k ∈ T in the user device set _i, adopt the contrary weighing criteria that selects method, calculate l _k,

$l_k=\frac{P_k\underset{j=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{\left|h_k^H{g}_{\left(j\right)}\right|}^2}{1+\frac{{\mathrm{<figure-callout\; id="0"\; label="P\; k\; N"\; filenames="H2009101664437E0000021.png,H2009101664437E0000041.png"\; state="\{\{state\}\}">P</figure-callout>}}_k}{N_{}}{\left|\right|h_k\left|\right|}^2},$

Selection makes l _kMinimum subscriber equipment is as new pairing subscriber equipment, and its theoretical foundation is as follows:

Because first pairing subscriber equipment || h _{π (1)}|| less, at first still, select with existing pairing subscriber equipment orthogonality preferably subscriber equipment as candidate user devices (step 3), but next no longer, overall system throughput selects subscriber equipment so that being target to the maximum, but so that throughput of first pairing subscriber equipment is target to the maximum, this will make this subscriber equipment in the signal of receiving terminal power ratio (SINR) maximum to interference plus noise.

What system adopted is least mean-square error (MMSE) receiver." radio communication basis " (Tse D, Viswanath P.Fundamentals of Wireless Communication.Cambridge:Cambridge University Press.2005. Chinese translation: Lee's clanging or clanking sound, Zhou Jin etc. translate the radio communication basis. Beijing: People's Telecon Publishing House .2007) in detail the received beam shaping weighing vector of MMSE receiver and the output signal power ratio (SINR) to interference plus noise has been described in detail.Specifically, the weighing vector of k the pairing k level of pairing subscriber equipment linear receiver is:

${(N_0{I}_M+\underset{i=1,i\&NotEqual;k}{\overset{N}{\mathrm{\&Sigma;}}}{P}_i{g}_{\left(i\right)}{g}_{\left(i\right)}^H)}^{-1}{g}_{\left(k\right)}---\left(2\right)$

Corresponding output SINR is:

$P_k{h}_k^H{(N_0{I}_M+\underset{i=1,i\&NotEqual;k}{\overset{N}{\mathrm{\&Sigma;}}}{P}_i{g}_{\left(i\right)}{g}_{\left(i\right)}^H)}^{-1}{g}_{\left(k\right)}---\left(3\right)$

At first, the situation of two subscriber equipment pairings is analyzed.If the space characteristics figure of existing pairing subscriber equipment is g ₍₁₎, seek pairing subscriber equipment k, make the following formula maximum:

${\mathrm{<figure-callout\; id="1"\; label="SINR"\; filenames="H2009101664437E0000021.png,H2009101664437E0000042.png"\; state="\{\{state\}\}">SINR</figure-callout>}}_1=P_1{g}_{\left(1\right)}^H{(N_0{I}_M+P_k{h}_k{h}_k^H)}^{-1}{g}_{\left(1\right)}---\left(4\right)$

Utilize the Sherman-Morrison formula:

${(A+{\mathrm{xx}}^H)}^{-1}=A^{-1}-\frac{A^{-1}{\mathrm{xx}}^H{A}^{-1}}{1+x^H{A}^{-1}x}---\left(5\right)$

Can get:

${\mathrm{<figure-callout\; id="1"\; label="SINR"\; filenames="H2009101664437E0000021.png,H2009101664437E0000042.png"\; state="\{\{state\}\}">SINR</figure-callout>}}_1=P_1{g}_{\left(1\right)}^H(\frac{1}{N_0}{I}_M-\frac{\frac{1}{N_0}{I}_M\&CenterDot;\sqrt{P_k}{h}_k\&CenterDot;\sqrt{P_k}{h}_k^H\&CenterDot;\frac{1}{N_0}{I}_M}{1+\sqrt{P_k}{h}_k^H\&CenterDot;\frac{1}{N_0}{I}_M\&CenterDot;\sqrt{P_k}{h}_k})g_{\left(1\right)}---\left(6\right)$

$=\frac{P_1}{{\mathrm{<figure-callout\; id="0"\; label="N"\; filenames="H2009101664437E0000021.png,H2009101664437E0000041.png"\; state="\{\{state\}\}">N</figure-callout>}}_0}{\left|\right|g_{\left(1\right)}\left|\right|}^2-\frac{P_1{\mathrm{<figure-callout\; id="0"\; label="P\; k\; N"\; filenames="H2009101664437E0000021.png,H2009101664437E0000041.png"\; state="\{\{state\}\}">P</figure-callout>}}_k}{N_{}^{}}\&CenterDot;\frac{{\left|h_k^H{g}_{\left(1\right)}\right|}^2}{1+\frac{{\mathrm{<figure-callout\; id="0"\; label="P\; k\; N"\; filenames="H2009101664437E0000021.png,H2009101664437E0000041.png"\; state="\{\{state\}\}">P</figure-callout>}}_k}{N_{}}{\left|\right|h_k\left|\right|}^2}$

Therefore, the space characteristics figure h of selected user equipment _kShould make following formula (7) minimum:

$\frac{P_k{\left|h_k^H{g}_{\left(1\right)}\right|}^2}{1+\frac{{\mathrm{<figure-callout\; id="0"\; label="P\; k\; N"\; filenames="H2009101664437E0000021.png,H2009101664437E0000041.png"\; state="\{\{state\}\}">P</figure-callout>}}_k}{N_{}}{\left|\right|h_k\left|\right|}^2}---\left(7\right)$

From formula (7), as can be seen, work as P _kWhen determining, if || h _k|| fix, then h _kWith g ₍₁₎Included angle cosine

The smaller the better; If included angle cosine

Fixing, then formula (7) can be converted into

$\frac{P_k{\left|h_k^H{g}_{\left(1\right)}\right|}^2}{1+\frac{{\mathrm{<figure-callout\; id="0"\; label="P\; k\; N"\; filenames="H2009101664437E0000021.png,H2009101664437E0000041.png"\; state="\{\{state\}\}">P</figure-callout>}}_k}{N_{}}{\left|\right|h_k\left|\right|}^2}={\left(\frac{\left|h_k^H{g}_{\left(1\right)}\right|}{\left|\right|h_k\left|\right|\left|\right|g_{\left(1\right)}\left|\right|}\right)}^2\&CenterDot;\frac{P_k{\left|\right|g_{\left(1\right)}\left|\right|}^2}{\frac{1}{{\left|\right|h_k\left|\right|}^2}+\frac{P_k}{N_0}}---\left(8\right)$

Therefore, || h _k|| the smaller the better.From this point difference of the present invention and existing semi-orthogonal matching method as can be seen: under the certain situation of angle, existing semi-orthogonal matching method is preferentially selected the big subscriber equipment of direction in space artwork value; The little subscriber equipment of the then reverse selection direction in space of the present invention artwork value is so claim " the contrary method of selecting ".

To situation more than the pairing of two subscriber equipmenies, when seeking i pairing subscriber equipment, calculated candidate subscriber equipment h one by one _k(k ∈ T _i) and existing pairing subscriber equipment g _(j)(j=1,2 ..., the i-1) value of trying to achieve according to pairing criterion formula (7)

$\frac{P_k{\left|h_k^H{g}_{\left(j\right)}\right|}^2}{1+\frac{{\mathrm{<figure-callout\; id="0"\; label="P\; k\; N"\; filenames="H2009101664437E0000021.png,H2009101664437E0000041.png"\; state="\{\{state\}\}">P</figure-callout>}}_k}{N_{}}{\left|\right|h_k\left|\right|}^2}(j=\mathrm{1,2},...,i-1)---\left(9\right)$

Remember it and be

$l_k=\underset{j=1}{\overset{i-1}{\mathrm{\&Sigma;}}}\frac{P_k{\left|h_k^H{g}_{\left(j\right)}\right|}^2}{1+\frac{{\mathrm{<figure-callout\; id="0"\; label="P\; k\; N"\; filenames="H2009101664437E0000021.png,H2009101664437E0000041.png"\; state="\{\{state\}\}">P</figure-callout>}}_k}{N_{}}{\left|\right|h_k\left|\right|}^2}=\frac{P_k\underset{j=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{\left|h_k^H{g}_{\left(j\right)}\right|}^2}{1+\frac{{\mathrm{<figure-callout\; id="0"\; label="P\; k\; N"\; filenames="H2009101664437E0000021.png,H2009101664437E0000041.png"\; state="\{\{state\}\}">P</figure-callout>}}_k}{N_{}}{\left|\right|h_k\left|\right|}^2}---\left(10\right)$

With this as the criterion of selecting i pairing subscriber equipment: from candidate user devices, choose make formula (10) obtain minimum value subscriber equipment as i pairing subscriber equipment, so just finished against selecting method.

Therefore, selected pairing criterion is calculated exactly

Selection makes l _kMinimum subscriber equipment is as new pairing subscriber equipment.

(3) descending virtual MIMO system

For downlink system, the semi-orthogonal matching method of Partial Inverse choosing is suitable equally.According to " radio communication basis " (Tse D, Viswanath P.Fundamentals of Wireless Communication.Cambridge:Cambridge University Press.2005. Chinese translation: Lee's clanging or clanking sound, Zhou Jin etc. translate, the radio communication basis. Beijing: up link of introducing People's Telecon Publishing House .2007) and the duality between the down link need only the received beam shaping weighing vector with k the pairing k level of pairing subscriber equipment linear receiver in the up link

As the transmit beam-forming weighing vector of k pairing subscriber equipment in the down link, can obtain identical output SINR:

Therefore, the semi-orthogonal matching method of Partial Inverse choosing is equally applicable to downlink system.

Next, will the present invention is described in detail by following specific embodiment.In due course, with each step of quoting among Fig. 2.

Present embodiment adopts the virtual MIMO system of 100 subscriber equipmenies, in dispatching cycle, will own || h _i| by ordering from small to large, get preceding surely 50% that part of subscriber equipment and form the S set of selecting scheme to match with contrary ₁According to the existing semi-orthogonal subscriber equipment matching method that T.Yoo and A.Goldsmith proposed, the parameter alpha of judgement orthogonality is value in [0.2,0.4] generally, in the present embodiment, gets α=0.4.Communication plan has four kinds, comprising three kinds of pairing schemes and a kind of nothing pairing scheme.Three kinds of pairing schemes are: the Partial Inverse that the existing semi-orthogonal pairing that random pair, T.Yoo and A.Goldsmith proposed and the present invention propose is selected the semi-orthogonal pairing; Last a kind of receive diversity scheme that the pairing scheme is the transmission of subscriber equipment end single antenna, the many antennas receptions of base station end of not having is for comparing.The antenna number of each subscriber equipment is 1, and the antenna number of base station is 4, and the maximum user device quantity supported simultaneously of system is 4 as can be known.Small scale decline model is the Rayleigh flat fading; Large scale propagation power attenuation coefficient γ _iPress the dB value and between [20,0], get uniformly-spaced value, simulate the different path loss of different user devices experience and the situation of shade with this.The subscriber equipment end sends gross power P _TotalBe made as 1000 (being 30dB), and adopt constant power to distribute; Noise power N ₀Be made as 1 (being 0dB).Subscriber equipment end total emission power is 1000 (being 30dB) than noise power.The base station end sends gross power P _Total-BSBe made as 1000 (being 30dB), and adopt constant power to distribute; Noise power N ₀Be made as 1 (being 0dB).Base station end total emission power is 1000 (being 30dB) than noise power.If channel is flat fading, quasistatic, the element of channel matrix is the multiple Gaussian random variable of independent identically distributed zero-mean, unit variance, noise is that average is zero, covariance matrix is the additive white Gaussian noise of unit matrix, the channel of each subscriber equipment experience is separate, and the base station can obtain the channel condition information of all subscriber equipmenies.Suppose that channel matrix remains unchanged in a dispatching cycle, and when the new cycle began, channel matrix was got new random value.

The Partial Inverse that present embodiment uses selects semi-orthogonal subscriber equipment matching method concrete steps as follows:

The 1st step: in a dispatching cycle, the base station obtains the space characteristics figure h of 100 subscriber equipmenies in the sub-district _i(1≤i≤100) (reference signal that sends by subscriber equipment obtains), as shown in table 1.

The space characteristics figure of table 1100 subscriber equipment

The space characteristics figure of 100 subscriber equipmenies of table 1 (continuous 1)

The space characteristics figure of 100 subscriber equipmenies of table 1 (continuous 2)

|| h _i|| see the following form:

The mould value of the space characteristics figure of table 2100 subscriber equipment

i	1	2	3	4	5	6	7	8	9	10
											||h i||	2.9330	1.6770	2.2038	2.3203	2.7774	3.0849	2.1511	2.7290	1.5403	2.4130

i	31	32	33	34	35	36	37	38	39	40
											||h i||	1.1254	1.9550	1.8074	1.4054	2.0720	1.4120	1.3585	1.1884	1.5476	1.0813

i	41	42	43	44	45	46	47	48	49	50
											||h i||	1.5020	1.4485	0.7096	0.9945	1.3083	0.6903	0.9509	1.0243	0.8011	0.6496

i	51	52	53	54	55	56	57	58	59	60
											||h i||	0.7483	0.7988	0.4458	0.9749	0.8443	0.6015	1.0168	0.7416	0.8220	0.5328

i	61	62	63	64	65	66	67	68	69	70
											||h i||	0.6324	0.7870	0.4583	0.7413	0.7215	0.5093	0.2770	0.8492	0.5093	0.7671

i	71	72	73	74	75	76	77	78	79	80
											||h i||	0.6796	0.7017	0.6847	0.5638	0.5874	0.5173	0.3348	0.4852	0.5526	0.2477

i	81	82	83	84	85	86	87	88	89	90
											||h i||	0.5179	0.3904	0.3843	0.3842	0.3819	0.3187	0.3680	0.3783	0.4963	0.3070

i	91	92	93	94	95	96	97	98	99	100
											||h i||	0.4194	0.4998	0.4043	0.2623	0.3020	0.2967	0.1530	0.1749	0.3236	0.2314

In these 100 subscriber equipmenies, the mould value of space characteristics figure || h _i|| the set that the sequence number of preceding 50% subscriber equipment that (1≤i≤100) are less is formed is S ₁=43,46,49,50,51,52,53,56,58,59,60,61,62,63,64,65,66,67,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100}.The sequence number of i the pairing subscriber equipment that π (i) expression is selected, π (i) ∈ 1,2 ..., 100}, 1≤i≤4.Existing pairing user device set The candidate matches user device set T ₁=1,2 ..., 100}.

The 2nd step: use the Round-Robin dispatching method to generate first pairing subscriber equipment, its sequence number is designated as π (1), below π (1)=47 and π (1)=56 is discussed respectively.

The situation of π (1)=47 at first, is discussed.

, upgrade existing pairing user device set: S at π (1)=47 o'clock ₀=47}, and make g ₍₁₎=h _{π (1)}=[0.6157+0.1257i ,-0.4760-0.1519i, 0.0678-0.0167i, 0.5040+0.0267i] ^TMake i=2, because So make base station configuration amount FLAG=0, change step 3;

The 3rd step: match user device set T from the candidate ₁In, select space characteristics figure and the last selected pairing subscriber equipment (being subscriber equipment 47)

g ₍₁₎=[0.6157+0.1257i ,-0.4760-0.1519i, 0.0678-0.0167i, 0.5040+0.0267i] ^TOrthogonality those subscriber equipmenies is preferably matched user device set as new candidate, promptly

Result of calculation such as following table:

The orthogonality that table 3 candidate matches subscriber equipment

The orthogonality that table 3 (continuous 1) candidate matches subscriber equipment

The orthogonality that table 3 (continuous 2) candidate matches subscriber equipment

T ₂＝{1，5，6，9，10，13，14，18，21，23，28，29，30，32，33，34，37，38，44，49，53，59，60，64，70，71，78，80，81，85，86，89，91，95，97，99}。

Obvious T ₂Be not empty, and FLAG=0, so change step 4.

The 4th step: the candidate is matched each subscriber equipment k ∈ T in the user device set ₂, the space that the space characteristics figure of each subscriber equipment in calculating it one by one and having the pairing user device set is opened is the component of quadrature mutually

As shown in the table:

The quadrature component that table 4 candidate matches subscriber equipment

The quadrature component that table 4 (continuous 1) candidate matches subscriber equipment

Calculate thus || g _k||, must get

The mould value of quadrature component that table 5 candidate matches subscriber equipment

k(k∈T 2)	1	5	6	9	10	13	14	18	21	23
											||g k||	2.9255	2.6205	3.0868	1.4803	2.3271	2.0904	2.6471	1.2912	1.6950	1.3072

k(k∈T 2)	28	29	30	32	33	34	37	38	44	49
											||g k||	1.8731	1.5208	1.5198	2.2795	1.7795	1.4405	1.3728	1.1480	1.0139	0.8956

k(k∈T 2)	53	59	60	64	70	71	78	80	81	85
											||g k||	0.4383	0.7776	0.5586	0.7701	0.7625	0.6810	0.4653	0.2503	0.4959	0.3953

k(k∈T 2)	86	89	91	95	97	99
							||g k||	0.3376	0.5227	0.4080	0.3015	0.1608	0.3358

Select || g _k|| maximum subscriber equipment is as new pairing subscriber equipment, promptly

Upgrade existing pairing user device set: S ₀← S ₀∪ { 6}, i.e. S ₀=47,6}.Order

g ₍₂₎=g _{π (2)}=[0.6482+0.9489i ,-1.5294-1.0258i, 1.3716+0.3473i ,-1.4189+0.8951i] ^TBecause the subscriber equipment number in the existing pairing user device set | S ₀|=2＜4, then make i=3, get back to step 3;

The 5th step: match user device set T from the candidate ₂In, select space characteristics figure and the last selected pairing subscriber equipment (being subscriber equipment 6)

g ₍₂₎=[0.6482+0.9489i ,-1.5294-1.0258i, 1.3716+0.3473i ,-1.4189+0.8951i] ^TOrthogonality those subscriber equipmenies is preferably matched user device set as new candidate, promptly

Result of calculation such as following table:

The orthogonality that table 6 candidate matches subscriber equipment

T ₃＝{5，10，18，29，30，32，33，34，38，44，59，64，86}。

Obvious T ₃Be not empty, and FLAG=0, so change step 4.

The 6th step: the candidate is matched each subscriber equipment k ∈ T in the user device set ₃, the space that the space characteristics figure of each subscriber equipment in calculating it one by one and having the pairing user device set is opened is the component of quadrature mutually

As shown in the table:

The quadrature component that table 7 candidate matches subscriber equipment

Calculate thus | g _k|,

The mould value of quadrature component that table 8 candidate matches subscriber equipment

k(k∈T 3)	5	10	18	29	30	32	33
								||g k||	2.5548	2.3635	1.3151	1.6284	1.8625	2.3249	1.8355

k(k∈T 3)

34

38

44

59

64

89

||g k||

1.3413

1.0982

0.9826

0.7508

0.8703

0.3538

Select || g _k|| maximum subscriber equipment is as new pairing subscriber equipment, promptly

Upgrade existing pairing user device set: S ₀← S ₀∪ { 5}, i.e. S ₀=47,6,5}.Order

g ₍₃₎=g _{π (3)}=[0.9254+0.6743i, 0.8151-0.9838i ,-0.0451+0.8778i, 1.4176+0.8955i] ^TBecause the subscriber equipment number in the existing pairing user device set | S ₀|=3＜4, then make i=4, get back to step 3;

The 7th step: match user device set T from the candidate ₃In, select space characteristics figure and the last selected pairing subscriber equipment (being subscriber equipment 5)

g ₍₃₎=[0.9254+0.6743i, 0.8151-0.9838i ,-0.0451+0.8778i, 1.4176+0.8955i] ^TOrthogonality those subscriber equipmenies is preferably matched user device set as new candidate, promptly

Result of calculation such as following table:

The orthogonality that table 9 candidate matches subscriber equipment

T ₄＝{33}。

Obvious T ₄Be not empty, and FLAG=0, so change step 4.

The 8th step: the candidate is matched each subscriber equipment k ∈ T in the user device set ₄, the space that the space characteristics figure of each subscriber equipment in calculating it one by one and having the pairing user device set is opened is the component of quadrature mutually

As shown in the table:

The quadrature component that table 10 candidate matches subscriber equipment

Calculate thus || g _k||,

The mould value of quadrature component that table 11 candidate matches subscriber equipment

k(k∈T 4)	33
		||g k||	1.8208

Select || g _k|| maximum subscriber equipment is as new pairing subscriber equipment, promptly

Upgrade existing pairing user device set: S ₀← S ₀∪ { 33}, i.e. S ₀=47,6,5,33}.Order

g ₍₄₎=g _{π (4)}=[0.0327+0.0247i, 0.3360-0.6011i, 0.0548-1.5970i, 0.0845+0.5281i] ^TBecause the subscriber equipment number in the existing pairing user device set | S ₀|=4, therefore change step 6;

The 9th step: if up-line system, to existing pairing user device set S ₀={ 47,6,5,4 subscriber equipmenies among the 33} carry out constant power and distribute, and the transmitting power of each subscriber equipment end is 1000/4=250, and the transmitting antenna of these four subscriber equipment ends is with antenna for base station, form 44 virtual MIMO systems of receiving, send data to the base station from the subscriber equipment end.The base station is detected processing with the MMSE receiver with the signal that each subscriber equipment sends, thereby finishes a virtual MIMO communication.

If downlink system, to sending to existing pairing user device set S ₀={ 47,6,5, the data of 4 subscriber equipmenies among the 33} are carried out the constant power distribution, and the transmitting power of each customer equipment data is 1000/4=250, and carry out transmit beam-forming according to the space characteristics figure of 4 subscriber equipmenies to sending data, antenna for base station is with the reception antenna of these four subscriber equipment ends, form 44 virtual MIMO systems of receiving, will send to the subscriber equipment end from the base station through the data of transmit beam-forming then, thereby finish a virtual MIMO communication.

Below, discuss and use the Round-Robin dispatching method to generate the situation of first pairing subscriber equipment π (1) in the 2nd step as π (1)=56.

, upgrade existing pairing user device set: S at π (1)=56 o'clock ₀={ 56}, and order

g ₍₁₎=h _{π (1)}=[0.0487+0.1188i 0.0638+0.4048i-0.3453-0.1420i 0.1948-0.0019i] ^TMake i=2, because 56 ∈ S ₁So, make base station configuration amount FLAG=1, change step 3;

The 3rd step: match user device set T from the candidate ₁In, select space characteristics figure and the last selected pairing subscriber equipment (being subscriber equipment 56)

g ₍₁₎=[0.0487+0.1188i, 0.0638+0.4048i ,-0.3453-0.1420i, 0.1948-0.0019i] ^TOrthogonality those subscriber equipmenies is preferably matched user device set as new candidate, promptly

Result of calculation such as following table:

The orthogonality that table 12 candidate matches subscriber equipment

The orthogonality that table 12 (continuous 1) candidate matches subscriber equipment

T ₂＝{5，7，9，10，14，16，18，27，29，30，32，34，35，37，38，41，43，44，45，46，50，51，54，57，59，62，64，71，74，76，80，81，87，89，90，91，92，100}。

Obvious T ₂Be not empty, and FLAG=1, so change step 5.

The 4th step: the candidate is matched each subscriber equipment k ∈ T in the user device set ₂,, calculate according to the contrary weighing criteria that selects method

P wherein _k=P _Total/ 4=250, N ₀=1, the result is as shown in the table:

Table 13 candidate matches the contrary method measurement index that selects of subscriber equipment

k(k∈T 2)	5	7	9	10	14	16	18	27	29	30
											l k	0.0296	0.0152	0.0226	0.0327	0.0392	0.0200	0.0039	0.0483	0.0414	0.0536

k(k∈T 2)	32	34	35	37	38	41	43	44	45	46
											l k	0.0327	0.0556	0.0129	0.0056	0.0243	0.0511	0.0395	0.0047	0.0440	0.0102

k(k∈T 2)	50	51	54	57	59	62	64	71	74	76
											l k	0.0562	0.0254	0.0268	0.0165	0.0179	0.0035	0.0155	0.0483	0.0451	0.0441

k(k∈T 2)	80	81	87	89	90	91	92	100
									l k	0.0166	0.0316	0.0413	0.0443	0.0328	0.0301	0.0350	0.0208

Selection makes l _kMinimum subscriber equipment is as new pairing subscriber equipment, promptly Upgrade existing pairing user device set: S ₀← S ₀∪ { π (2) }, i.e. S ₀=56,62}.Order

g ₍₂₎=h _{π (2)}=[0.3746+0.1258i ,-0.0232+0.0994i, 0.2197+0.2547i, 0.5735+0.1038i] ^TBecause existing pairing user device set S ₀Satisfy | S ₀|=2＜4, so make i=3, get back to step 3;

The 5th step: match user device set T from the candidate ₂In, select space characteristics figure and the last selected pairing subscriber equipment (being subscriber equipment 62)

g ₍₂₎=[0.3746+0.1258i ,-0.0232+0.0994i, 0.2197+0.2547i, 0.5735+0.1038i] ^TOrthogonality those subscriber equipmenies is preferably matched user device set as new candidate, promptly

Result of calculation such as following table:

The orthogonality that table 14 candidate matches subscriber equipment

T ₃＝{9，14，29，30，34，37，43，44，51，64，74，80，89}。

Obvious T ₃Be not empty, and FLAG=1, so change step 5.

The 6th step: the candidate is matched each subscriber equipment k ∈ T in the user device set ₃,, calculate according to the contrary weighing criteria that selects method P wherein _k=P _Total/ 4=250, N ₀=1, the result is as shown in the table:

Table 15 candidate matches the contrary method measurement index that selects of subscriber equipment

k(k∈T 3)	9	14	29	30	34	37	43
								l k	0.0414	0.0531	0.0786	0.0656	0.0671	0.0290	0.1351

k(k∈T 3)	44	51	64	74	80	89
							l k	0.0338	0.0409	0.0262	0.1358	0.0480	0.0712

Selection makes l _kMinimum subscriber equipment is as new pairing subscriber equipment, promptly

Upgrade existing pairing user device set: S ₀← S ₀∪ { π (3) }, i.e. S ₀=56,62,64}.Order

g ₍₃₎=h _{π (3)}=[0.4236-0.0867i, 0.4221+0.0480i, 0.1511-0.1769i ,-0.3569-0.0246i] ^TBecause existing pairing user device set S ₀Satisfy | S ₀|=3＜4, so make i=4, get back to step 3;

The 7th step: match user device set T from the candidate ₃In, select space characteristics figure and the last selected pairing subscriber equipment (being subscriber equipment 64)

g ₍₃₎=[0.4236-0.0867i, 0.4221+0.0480i, 0.1511-0.1769i ,-0.3569-0.0246i] ^TOrthogonality those subscriber equipmenies is preferably matched user device set as new candidate, promptly

Result of calculation such as following table:

The orthogonality that table 16 candidate matches subscriber equipment

T ₄＝{9，30，43，74}。

Obvious T ₄Be not empty, and FLAG=1, so change step 5.

The 8th step: the candidate is matched each subscriber equipment k ∈ T in the user device set ₄,, calculate according to the contrary weighing criteria that selects method

P wherein _k=P _Total/ 4=250, N ₀=1, the result is as shown in the table:

Table 17 candidate matches the contrary method measurement index that selects of subscriber equipment

k(k∈T 4)	9	30	43	74
					l k	0.0886	0.1137	0.1702	0.1711

Selection makes l _kMinimum subscriber equipment is as new pairing subscriber equipment, promptly

Upgrade existing pairing user device set: S ₀← S ₀∪ { π (4) }, i.e. S ₀=56,62,64,9}.Because existing pairing this moment user device set S ₀Satisfy | S ₀|=4, therefore change step 6;

The 9th step: if up-line system, to existing pairing user device set S ₀={ 56,62,64,4 subscriber equipmenies among the 9} carry out constant power and distribute, and the transmitting power of each subscriber equipment end is 1000/4=250, and the transmitting antenna of these four subscriber equipment ends is with antenna for base station, form 44 virtual MIMO systems of receiving, send data to the base station from the subscriber equipment end.The base station is detected processing with the MMSE receiver with the signal that each subscriber equipment sends, thereby finishes a virtual MIMO communication.

If downlink system, to sending to existing pairing user device set S ₀={ 56,62,64, the data of 4 subscriber equipmenies among the 9} are carried out the constant power distribution, and the transmitting power of each customer equipment data is 1000/4=250, and carry out transmit beam-forming according to the space characteristics figure of 4 subscriber equipmenies to sending data, antenna for base station is with the reception antenna of these four subscriber equipment ends, form 44 virtual MIMO systems of receiving, will send to the subscriber equipment end from the base station through the data of transmit beam-forming then, thereby finish a virtual MIMO communication.

Fig. 3 shows the schematic block diagram according to base station 300 of the present invention.

As shown in Figure 3, base station 300 comprises: space characteristics figure deriving means 310, pairing subscriber equipment generation device 320, candidate match user device set choice device 330, pairing subscriber equipment choice device 340 and data transmission device 350.

Space characteristics figure deriving means 310 was used in a dispatching cycle, obtained the space characteristics figure h of K subscriber equipment _i(1≤i≤K) (reference signal that sends by subscriber equipment obtains), S ₁The mould value of representing space characteristic pattern in K the subscriber equipment || h _i|| less than the set that the sequence number of the subscriber equipment of first predetermined threshold value is formed, S ₀The existing pairing of expression user device set, T _iThe expression candidate matches user device set, order

T ₁=1,2 ..., K}.

Pairing subscriber equipment generation device 320 is used at the current time slots in this dispatching cycle, uses the Round-Robin dispatching method, produces first pairing subscriber equipment π (1) at current time slots, upgrades existing pairing user device set: S ₀={ π (1) }, and get g ₍₁₎=h _{π (1)}, i=2.If Then make base station configuration amount FLAG=0, otherwise, base station configuration amount FLAG=1 made.

The candidate matches user device set choice device 330 and is used for matching user device set T from the candidate _I-1In, select space characteristics figure h _kSpace characteristics figure h with selected pairing subscriber equipment π (i-1) of the last time _{π (i-1)}The component g of the space phase quadrature of being opened with respect to the space characteristics figure of previous pairing subscriber equipment _(i-1)Orthogonality is less than those subscriber equipmenies of the second predetermined threshold value α, matches user device set T as new candidate _i, promptly

$T_i=\{k\&Element;T_{i-1},k\&NotEqual;\mathrm{\&pi;}(i-1)|\frac{\left|h_k^H{g}_{(i-1)}\right|}{\left|\right|h_k\left|\right|\left|\right|g_{(i-1)}\left|\right|}<\mathrm{\&alpha;}\}.$

Pairing subscriber equipment choice device 340 is used for

And during FLAG=1, the candidate is matched user device set T _iIn each subscriber equipment k ∈ T _i, according to by existing pairing user device set S ₀In each subscriber equipment j ∈ S ₀The space characteristics figure space of being opened, calculate one by one

$l_k=\frac{P_k\underset{j=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{\left|h_k^H{g}_{\left(j\right)}\right|}^2}{1+\frac{{\mathrm{<figure-callout\; id="0"\; label="P\; k\; N"\; filenames="H2009101664437E0000021.png,H2009101664437E0000041.png"\; state="\{\{state\}\}">P</figure-callout>}}_k}{N_{}}{\left|\right|h_k\left|\right|}^2},$

Selection makes l _kMinimum subscriber equipment

As new pairing subscriber equipment; And

But during FLAG=0, the candidate is matched user device set T _iIn each subscriber equipment k ∈ T _i, calculate one by one with by existing pairing user device set S ₀In each subscriber equipment j ∈ S ₀The component of the space phase quadrature opened of space characteristics figure

$g_k=h_k-\underset{j=1}{\overset{i-1}{\mathrm{\&Sigma;}}}\frac{h_k^H{g}_{\left(j\right)}}{{\left|\right|g_{\left(j\right)}\left|\right|}^2}{g}_{\left(j\right)},$

Selection makes || g _k|| maximum subscriber equipment

As new pairing subscriber equipment; Upgrade existing pairing user device set: S ₀← S ₀∪ { π (i) }, and get g _(i)=g _{π (i)}

Data transmission device 350 is used for Perhaps existing pairing user device set S ₀In the number of subscriber equipment | S ₀| when equaling the sum M of reception antenna of base station, with existing pairing user device set S ₀In subscriber equipment form virtual multiple-input-multiple-output communication system, carry out the transfer of data of current time slots.

The candidate matches user device set choice device 330 and also is used at existing pairing user device set S ₀In the number of subscriber equipment | S ₀| during less than the sum M of the reception antenna of base station, upgrade subscriber equipment counting i ← i+1, choose new candidate and match user device set T _i

At upstream data communication, data transmission device 350 usefulness linear minimum mean-squared error (MMSE) receivers receive the signal that each subscriber equipment sends.

At downlink data communication, in the candidate matches user device set choice device 330 and data transmission device 350, will have pairing user device set S ₀In the number of subscriber equipment | S ₀| and relatively being converted between the sum M of the reception antenna of base station has pairing user device set S ₀In the number of subscriber equipment | S ₀| and the comparison between the total Q of the transmitting antenna of base station.In addition, at downlink data communication, 350 pairs of data transmission devices send to existing pairing user device set S ₀In the data of subscriber equipment carry out constant power and distribute, carry out transmit beam-forming according to the space characteristics figure of each subscriber equipment to sending data, then, will send to subscriber equipment through the data of transmit beam-forming.

After finishing the transfer of data of current time slots, pairing subscriber equipment generation device 320 produces first pairing subscriber equipment π (1) at next time slot.

After the transfer of data of all time slots in finishing current dispatching cycle, space characteristics figure deriving means 310 regains the space characteristics figure h of the individual subscriber equipment of K ' _i, (at this moment, the user device quantity in the sub-district may change 1≤i≤K '

).

Figure 4 shows that in the virtual MIMO system after 10000 dispatching cycles the value (according to descending ordering) of each subscriber equipment average throughput under difference pairing scheme in average each dispatching cycle.The system emulation parameter is: antenna for base station is counted M=4, subscriber equipment sum K=100; Small scale decline model is the Rayleigh flat fading; Large scale propagation power attenuation coefficient γ _iPress the dB value and between [20,0], get uniformly-spaced value, simulate the different path loss of different user devices experience and the situation of shade with this.The subscriber equipment end sends gross power P _TotalBe made as 1000 (being 30dB), and adopt constant power to distribute; Noise power N ₀Be made as 1 (being 0dB).In dispatching cycle, will own || h _i|| by ordering from small to large, get preceding surely 50% that part of subscriber equipment and form the S set of selecting scheme to match with contrary ₁The parameter alpha of judgement orthogonality is made as α=0.4.Communication plan has four kinds, comprising three kinds of pairing schemes and a kind of nothing pairing scheme.Three kinds of pairing schemes are: the Partial Inverse that the existing semi-orthogonal pairing that random pair, T.Yoo and A.Goldsmith proposed and the present invention propose is selected the semi-orthogonal pairing; Last a kind of receive diversity scheme that the pairing scheme is the transmission of subscriber equipment end single antenna, the many antennas receptions of base station end of not having is for comparing.

As can be seen, the existing semi-orthogonal pairing scheme fairness that T.Yoo and A.Goldsmith proposed is relatively poor, nearly 70% subscriber equipment throughput is not only arranged not as 3GPP motion R1-051422 (3GPP TSG-RAN1, R1-051422) the random pair scheme of Ti Chuing, and even also have 30% subscriber equipment less than the receive diversity scheme of not having pairing; By contrast, the Partial Inverse that the present invention proposes selects semi-orthogonal pairing scheme to guarantee that then all subscriber equipmenies all surpass the throughput under the receive diversity scheme of not having pairing, all subscriber equipmenies can both be benefited from participate in virtual MIMO communication, and to the relatively poor subscriber equipment of those channel conditions, its throughput and random pair scheme are almost suitable, and such fairness is satisfactory.

Figure 5 shows that the comparison of the overall system throughput of various pairing schemes in average each dispatching cycle under Fig. 4 simulation parameter: 1 for there not being the receive diversity of pairing; 2 is 3GPP motion R1-051422 (3GPP TSG-RAN1, R1-051422) random pair of Ti Chuing; 3 select semi-orthogonal for the Partial Inverse of the present invention's proposition matches; 4 is the existing semi-orthogonal pairing that T.Yoo and A.Goldsmith proposed.

As can be seen, Partial Inverse selects semi-orthogonal pairing scheme and existing semi-orthogonal pairing scheme all to surpass the random pair scheme on overall system throughput, and the former surpasses 49.7%, and the latter surpasses 65.4%.As seen, though the Partial Inverse that the present invention proposes selects semi-orthogonal pairing scheme compared with existing semi-orthogonal pairing scheme certain loss to be arranged on overall system throughput, but still apparently higher than the random pair scheme.

The present invention is a starting point with the throughput that improves channel condition poor user equipment, has proposed a kind of Partial Inverse and has selected semi-orthogonal subscriber equipment matching method.This method is by analyzing the SINR expression formula of MMSE receiver, and the certain customers equipment relatively poor to channel condition proposes the pairing criterion of " contrary choosing ".Computer artificial result shows that this method can effectively improve the throughput of the relatively poor subscriber equipment of channel condition under overall system throughput descends few prerequisite, thereby obtains compromise preferably between overall system throughput and subscriber equipment fairness.

Should be noted in the discussion above that in above description,, show technical scheme of the present invention, but be not intended that the invention be limited to above-mentioned steps and cellular construction only in the mode of example.Under possible situation, can adjust and accept or reject step and cellular construction as required.Therefore, some step and unit are not to implement the necessary element of overall invention thought of the present invention.Therefore, technical characterictic essential to the invention only is subject to the minimum requirements that can realize overall invention thought of the present invention, and is not subjected to the restriction of above instantiation.

So far invention has been described in conjunction with the preferred embodiments.Should be appreciated that those skilled in the art can carry out various other change, replacement and interpolations under the situation that does not break away from the spirit and scope of the present invention.Therefore, scope of the present invention is not limited to above-mentioned specific embodiment, and should be limited by claims.

Claims (16)

1. subscriber equipment matching method comprises:

In a dispatching cycle, obtain the space characteristics figure h of K subscriber equipment _i, 1≤i≤K, S ₁The mould value of representing space characteristic pattern in K the subscriber equipment || h _i|| less than the set that the sequence number of the subscriber equipment of first predetermined threshold value is formed, S ₀The existing pairing of expression user device set, T _iThe expression candidate matches user device set, order

T ₁=1,2 ..., K};

At the current time slots in this dispatching cycle, the mode of taking turns according to all K subscriber equipment produces first pairing subscriber equipment π (1) at current time slots, upgrades existing pairing user device set: S ₀={ π (1) }, and get g ₍₁₎=h _{π (1)}, i=2;

Match user device set T from the candidate _I-1In, select space characteristics figure h _kSpace characteristics figure h with selected pairing subscriber equipment π (i-1) of the last time _{π (i-1)}The component g of the space phase quadrature of being opened with respect to the space characteristics figure of previous pairing subscriber equipment _(i-1)Orthogonality satisfies those subscriber equipmenies of the second predetermined threshold value α, matches user device set as new candidate, promptly

$T_i=\{k\&Element;T_{i-1},k\&NotEqual;\mathrm{\&pi;}(i-1)|\frac{\left|h_k^H{g}_{(i-1)}\right|}{\left|\right|h_k\left|\right|\left|\right|g_{(i-1)\left|\right|}}<\mathrm{\&alpha;}\};$

If

And π (1) ∈ S ₁, then the candidate is matched user device set T _iIn each subscriber equipment k ∈ T _i, according to by existing pairing user device set S ₀In each subscriber equipment j ∈ S ₀The space characteristics figure space of being opened, calculate one by one

$l_k=\frac{P_k\underset{j=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{\left|h_k^H{g}_{\left(j\right)}\right|}^2}{1+\frac{P_k}{N_0}{\left|\right|h_k\left|\right|}^2},$

Selection makes l _kMinimum subscriber equipment

As new pairing subscriber equipment, upgrade existing pairing user device set: S ₀← S ₀∪ { π (i) }, and get g _(i)=h _{π (i)}And

If Perhaps existing pairing user device set S ₀In the number of subscriber equipment | S ₀| equal the sum M of the reception antenna of base station, then existing pairing user device set S ₀In subscriber equipment and base station form virtual multiple-input-multiple-output communication system, carry out the transfer of data of current time slots.

2. subscriber equipment matching method according to claim 1 also comprises:

If

But

Then the candidate is matched user device set T _iIn each subscriber equipment k ∈ T _i, calculate one by one with by existing pairing user device set S ₀In each subscriber equipment j ∈ S ₀The component of the space phase quadrature opened of space characteristics figure Selection makes || g _k|| maximum subscriber equipment

As new pairing subscriber equipment, upgrade existing pairing user device set: S ₀← S ₀∪ { π (i) }, and get g _(i)=g _{π (i)}

3. subscriber equipment matching method according to claim 1 and 2 also comprises:

If existing pairing user device set S ₀In the number of subscriber equipment | S ₀| less than the sum M of the reception antenna of base station, then upgrade subscriber equipment counting i ← i+1, return the candidate and match user device set T _iChoose step.

4. according to the described subscriber equipment matching method of one of claim 1～3, it is characterized in that:

At upstream data communication,

To existing pairing user device set S ₀In subscriber equipment carry out constant power and distribute, subscriber equipment is united to the base station and is sent data; And

The base station receives the signal that each subscriber equipment sends with the linear minimum mean-squared error receiver.

5. according to the described subscriber equipment matching method of one of claim 1～3, it is characterized in that:

At downlink data communication, with above-mentioned existing pairing user device set S ₀In the number of subscriber equipment | S ₀| and relatively being converted between the sum M of the reception antenna of base station has pairing user device set S ₀In the number of subscriber equipment | S ₀| and the comparison between the total Q of the transmitting antenna of base station; And

At downlink data communication,

To sending to existing pairing user device set S ₀In the data of subscriber equipment carry out constant power and distribute;

Space characteristics figure according to each subscriber equipment carries out transmit beam-forming to sending data; And

To send to subscriber equipment through the data of transmit beam-forming.

6. according to the described subscriber equipment matching method of one of claim 1～3, it is characterized in that:

After finishing the transfer of data of current time slots, produce first pairing subscriber equipment π (1) at next time slot; And

After the transfer of data of all time slots in finishing current dispatching cycle, regain the space characteristics figure h of the individual subscriber equipment of K ' _i, 1≤i≤K '.

7. according to the described subscriber equipment matching method of one of claim 1～3, it is characterized in that:

The space characteristics figure h of subscriber equipment _iBe to obtain by the reference signal that subscriber equipment sends.

8. according to the described subscriber equipment matching method of one of claim 1～3, it is characterized in that:

Use the Round-Robin dispatching method, produce first pairing subscriber equipment π (1) at current time slots.

9. base station comprises:

Space characteristics figure deriving means was used in a dispatching cycle, obtained the space characteristics figure h of K subscriber equipment _i, 1≤i≤K, S ₁The mould value of representing space characteristic pattern in K the subscriber equipment || h _i|| less than the set that the sequence number of the subscriber equipment of first predetermined threshold value is formed, S ₀The existing pairing of expression user device set, T _iThe expression candidate matches user device set, order

T ₁=1,2 ..., K};

Pairing subscriber equipment generation device is used at the current time slots in this dispatching cycle, and the mode of taking turns according to all K subscriber equipment produces first pairing subscriber equipment π (1) at current time slots, upgrades existing user device set: the S of pairing ₀={ π (1) }, and get g ₍₁₎=h _{π (1)}, i=2;

The candidate matches the user device set choice device, is used for matching user device set T from the candidate _I-1In, select space characteristics figure h _kSpace characteristics figure h with selected pairing subscriber equipment π (i-1) of the last time _{π (i-1)}The component g of the space phase quadrature of being opened with respect to the space characteristics figure of previous pairing subscriber equipment _(i-1)Orthogonality satisfies those subscriber equipmenies of the second predetermined threshold value α, matches user device set T as new candidate _i, promptly

$T_i=\{k\&Element;T_{i-1},k\&NotEqual;\mathrm{\&pi;}(i-1)|\frac{\left|h_k^H{g}_{(i-1)}\right|}{\left|\right|h_k\left|\right|\left|\right|g_{(i-1)\left|\right|}}<\mathrm{\&alpha;}\};$

Pairing subscriber equipment choice device is used for

And π (1) ∈ S ₁The time, the candidate is matched user device set T _iIn each subscriber equipment k ∈ T _i, according to by existing pairing user device set S ₀In each subscriber equipment j ∈ S ₀The space characteristics figure space of being opened, calculate one by one

$l_k=\frac{P_k\underset{j=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{\left|h_k^H{g}_{\left(j\right)}\right|}^2}{1+\frac{P_k}{N_0}{\left|\right|h_k\left|\right|}^2},$ Selection makes l _kMinimum subscriber equipment

As new pairing subscriber equipment, upgrade existing pairing user device set: S ₀← S ₀∪ { π (i) }, and get g _(i)=h _{π (i)}And

Data transmission device is used for

Perhaps existing pairing user device set S ₀In the number of subscriber equipment | S ₀| when equaling the sum M of reception antenna of base station, with existing pairing user device set S ₀In subscriber equipment form virtual multiple-input-multiple-output communication system, carry out the transfer of data of current time slots.

10. base station according to claim 9 is characterized in that:

Pairing subscriber equipment choice device also is used for

But

The time, the candidate is matched user device set T _iIn each subscriber equipment k ∈ T _i, calculate one by one with by existing pairing user device set S ₀In each subscriber equipment j ∈ S ₀The component of the space phase quadrature opened of space characteristics figure

Selection makes || g _k|| maximum subscriber equipment As new pairing subscriber equipment, upgrade existing pairing user device set: S ₀← S ₀∪ { π (i) }, and get g _(i)=g _{π (i)}

11., it is characterized in that according to claim 9 or 10 described base stations:

The candidate matches the user device set choice device and also is used at existing pairing user device set S ₀In the number of subscriber equipment | S ₀| during less than the sum M of the reception antenna of base station, upgrade subscriber equipment counting i ← i+1, choose new candidate and match user device set T _i

12., it is characterized in that according to the described base station of one of claim 9～11: at upstream data communication,

Data transmission device receives the signal that each subscriber equipment sends with the linear minimum mean-squared error receiver.

13., it is characterized in that according to the described base station of one of claim 9～11:

At downlink data communication, in above-mentioned candidate matches user device set choice device and above-mentioned data transmission device, will have pairing user device set S ₀In the number of subscriber equipment | S ₀| and relatively being converted between the sum M of the reception antenna of base station has pairing user device set S ₀In the number of subscriber equipment | S ₀| and the comparison between the total Q of the transmitting antenna of base station; And

At downlink data communication, data transmission device

To sending to existing pairing user device set S ₀In the data of subscriber equipment carry out constant power and distribute;

Space characteristics figure according to each subscriber equipment carries out transmit beam-forming to sending data; And

To send to subscriber equipment through the data of transmit beam-forming.

14., it is characterized in that according to the described base station of one of claim 9～11:

After finishing the transfer of data of current time slots, pairing subscriber equipment generation device produces first pairing subscriber equipment π (1) at next time slot; And

After the transfer of data of all time slots in finishing current dispatching cycle, space characteristics figure deriving means regains the space characteristics figure h of the individual subscriber equipment of K ' _i, 1≤i≤K '.

15., it is characterized in that according to the described base station of one of claim 9～11:

The reference signal that space characteristics figure deriving means sends according to subscriber equipment obtains the space characteristics figure h of subscriber equipment _i

16., it is characterized in that according to the described base station of one of claim 9～11:

Pairing subscriber equipment generation device uses the Round-Robin dispatching method, produces first pairing subscriber equipment π (1) at current time slots.

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