CN101621321A - Closed loop constant modulus multi-user MIMO system and a control signaling processing method thereof - Google Patents

Abstract

The invention provides a closed loop constant modulus multi-user MIMO system and a control signaling processing method thereof. The system comprises an emitter and a receiver; wherein, the emitter comprises a user selection unit for selecting served users, a wave beam forming unit for receiving the selected channel quality information and composite channel vector from the feedback of the users and calculating the wave beam forming weight based on the received information, a receiver which is used as a user device of a user and a feedback unit used for back feeding the channel quality information and the composite channel vector by calculating expected interference.

Description

Closed loop constant modulus multi-user MIMO system and control signal processing method thereof

Technical field

The present invention relates to a kind of multiuser MIMO (MU-MIMO) system, multi-user MIMO system in particularly a kind of wireless communication system and control signaling thereof.

Background technology

In the past few years, the multiple-input and multiple-output (MIMO) with Limited Feedback has caused the attention of theoretical and industrial community.It has become many standards () pith for example, 3GPP Release 8, and be considered to one of main feature of following radio communication now.

For the practical MIMO system with Limited Feedback, the power imbalance by a plurality of antennas is avoided when at emission side execution precoding or beam shaping in expectation.The power imbalance faces energy loss, and this is because the power amplifier of each antenna is generally shared identical peak power output.Single User MIMO (SU-MIMO) code book of regulation is supported constant modulus property among the 3GPP Release 8, makes that power amplifier can be with balance mode work.The experiment proved that this permanent mould code book in the base station and permanent mould precoding computing work are very good, and be better than GLP (Grassmanian-Line-Packet) code book of non-permanent mould.

The MU-MIMO technology, for example, PU ²RC (Per-user-unitary Rate Control) allows a plurality of streams are sent to a plurality of users that arrange in the identical Resource Block (RB) simultaneously with ZF (ZF) beam shaping.PU ²RC carries out unitary matrix precoding or beam shaping and only quadrature is applied the user arranging restriction at NodeB.ZF (ZF) purpose is to maximize the user's interest gain, minimizes the user that other are arranged simultaneously simultaneously.

Yet the shortcoming of ZF beam shaping is: non-permanent mould causes the power imbalance by a plurality of antennas, and very large transmission codebook size causes expensive DRS (Dedicated Reference Signal) and is difficult to carry out the presence of intercell interference management.

And PU ²The shortcoming problem of RC is, because unitary matrix arrangement restriction (unitary schedulingconstraint) cause that quantizing codebook size increases, and throughput performance does not always improve.PU when the quantification codebook size is 1 bit or 2 bits ²The RC best performance.So PU ²RC is suitable for the system of very high capacity, and for the unusual system of high capacity, it is crucial reducing signaling consumption.

Summary of the invention

The object of the present invention is to provide a kind of system and signal processing method thereof of permanent mould beam shaping of the MIMO of being used for broadcast channel.

A kind of closed loop constant modulus multi-user MIMO system is provided, has comprised reflector and receiver, reflector comprises: user selection unit is used to select the user who serves; Beam shaping elements, the channel quality information and the compound channel vector of the user feedback of receive selecting, and come compute beam shaping weights based on the information that receives; Receiver comprises as user's user's set: feedback unit, the interference by calculation expectation comes feedback channel quality information and compound channel vector.

A kind of control signal processing method that is used for closed loop constant modulus multi-user MIMO system is provided, and when starting the dynamic mode switching, comprising: in up signaling control and treatment, the user feedback content is γ _k ^ZF, Δ γ _kWith

Wherein $\mathrm{\Δ}{\mathrm{\γ}}_k=\frac{2}{M}{\mathrm{\γ}}_k^{\mathrm{ZF}}-{\mathrm{\γ}}_k^{P{U}^2\mathrm{RC}}.$ If reflector is selected two user's services, then launch based on the ZF pattern, utilize feedback content γ at reflector _k ^ZFWith

Realize that ZF handles, if reflector is selected more than two users, then based on PU ²The RC pattern is launched, and in the reflector utilization $\frac{2}{M}{\mathrm{\&gamma;}}_k^{\mathrm{ZF}}-\mathrm{\&Delta;}{\mathrm{\&gamma;}}_k,{\left({\hat{h}}_{c,k}^H\right)}_{\mathrm{ZF}}\&RightArrow;{\left({\hat{h}}_{c,k}^H\right)}_{{\mathrm{<figure-callout\; id="2"\; label="PU"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">PU</figure-callout>}}^2\mathrm{RC}}$ Realize PU ²RC handles.

Description of drawings

By the description of carrying out below in conjunction with accompanying drawing, above-mentioned and other purposes of the present invention will become apparent, wherein:

Fig. 1 is the block diagram that illustrates according to the structure of the closed loop constant modulus multi-user MIMO system of the embodiment of the invention;

Fig. 2 is the diagrammatic sketch according to the structure of the feedback unit that is used to calculate CQI of the present invention;

Fig. 3 is nearly excellent permanent mould beam shaping vector f _kWith power loss LO _kThe flow chart of process.

Embodiment

System model according to mimo system of the present invention is described below.

According to mimo system of the present invention, have M transmitting antenna in the base station, Nr reception antenna be equipped with in each of K user of target sector.From the code book C of user's quantification feedback by 2 ^BSize-M * 1 unit base vector is formed:

$C\stackrel{\mathrm{\&Delta;}}{=}\{v_1,...,v_{2^B}\}.$ Wherein, B is the quantity of feedback bits.Continue on the cycle at given frame, user's subclass is arranged in the base station:

Under the Limited Feedback condition, the maximum of distributing to each user's stream is fixed as 1.Time sampling at the MU-MIMO channel of the linear predictive coding of base station applies under many sub-districts and many sectors environment is provided by following equation (1):

y＝HG(S)u+I _inter+n

Wherein, u is the vector of the independent data symbol of the parallel emission of M transmitting antenna,

Be linear predictive coding device in base station applies, and its production method depend on specific MU-MIMO pattern (for example, SDMA, ZF).

Be | the vector of the signal that the user of S| arrangement receives respectively, n～CN (0, I) be the compound Gaussian noise vector of i.i.d.I _InterInterference between expression and other sub-district and the sector.Matrix $H={[H_{c,1}^T,...,H_{c,k}^T,...H_{c,\left|s\right|}^T]}^T$ Comprise from M transmitting antenna to | S| user's channel coefficients, wherein, row vector h _{C, k}It is the composite channel of user k.h _{C, k}=w _kH _k, wherein, w _kExpression is satisfied || w _k|| ²The received beam former of=1 user k, H _kExpression from the base station to the physical channel of user k.Notice that each user's set of channel feedback only limits to one deck saving feedback, and do not consider that the quantity of the antenna that user's set is equipped with transmits the control signaling consumption, so h _{C, k}It is size 1 * M row vector.

With the N that receives _rThe signal of individual reception and w _kThe useful signal that receives at user k after the combination is provided by following equation:

Wherein, d _t ^rExpression from r base station and j light beam to distracter the cell/section of user k, and

$\mathrm{\&epsiv;}\left[d_t^r{\left(d_t^r\right)}^H\right]=1\&ForAll;r,t,\mathrm{\&epsiv;}\left[d_{t1}^{r1}{\left(d_{t2}^{r2}\right)}^H\right]=0\&ForAll;\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">t</figure-callout>}1\&NotEqual;\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">t</figure-callout>}2\mathrm{<figure-callout\; id="1"\; label="orr"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">orr</figure-callout>}1\&NotEqual;\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">r</figure-callout>}2.$ H _k ^rThe physical channel of expression from the r base station to user k.

For the ZF beam shaping, each user k quantizes " direction " of its compound channel ${\tilde{h}}_{c,k}=h_{c,k}/\left|\right|h_{c,k}\left|\right|$ Be the unit base vector of selecting from code book C

It is the compound channel vector that connection unit's benchmark of the user that selects quantizes.The ZF emission matrix is provided by following equation:

Wherein, P=[p ₁... p _K] ^TIt is the vector of power normalization coefficient that Power Limitation P is applied to the signal of emission.Equal power for the user who passes through to select is distributed,

F wherein _kThe k row of expression F.

Fig. 1 is the block diagram according to the structure of closed loop MU-MIMO of the present invention system.

With reference to Fig. 1, closed loop MU-MIMO system comprises reflector (that is base station) 10 and a plurality of receiver (that is user's set) 20.Reflector 10 comprises user selection unit 11, beam shaping elements 12 and Duo Gen TX antenna.Each of a plurality of receivers 20 comprises feedback unit 21 and Duo Gen reception antenna.

Receiver 20 is estimated channel by public guide frequency (common pilot) or DRS (Dedicated Reference Signal) (DRC), and the quantized channel state information (CQI) of quantification code book is indicated and had to the calculating channel quality.

Reflector 10 produces the beam shaping weighting by the feedback information that receives, and the user's set information of selecting to receiver 20 notices, for example UE ID, precoding vectors, modulation and encoding scheme (MCS) level etc.

In order to obtain better transmission property, need allow reflector learn channel status.In reflector, user selection unit 11 need to select the user's set (that is receiver) of feedback channel state.In receiver, feedback unit 21 needs feedback optimal channel quality information (CQI) and pre-coding matrix index (PMI).

Fig. 2 is the diagrammatic sketch according to the structure of the feedback unit 21 that is used to calculate CQI of the present invention.

Permanent mould beam shaping according to the present invention is ZF pattern and PU ²The hybrid plan of RC pattern.Therefore here feedback unit 21 feedback operation of carrying out based on ZF pattern and PU ²The RC pattern.

Feedback unit 21 comprises expectation interference calculation unit 211 in the sub-district, minizone expectation interference calculation unit 212, and the E[SINR that lower bound is carried out evaluation according to the Jensen inequality _k] lower bound computing unit 213.

Expectation interference calculation unit 211 is passed through equation in the sub-district Expectation is disturbed in the calculation plot, and minizone expectation interference calculation unit 212 is passed through equation $w_{k}E\left[\underset{r}{\mathrm{\&Sigma;}}{H}_k^r\underset{t}{\mathrm{\&Sigma;}}{g}_t^r{\left(\underset{r}{\mathrm{\&Sigma;}}{H}_k^r\underset{t}{\mathrm{\&Sigma;}}{g}_t^r\right)}^H\right]w_k^H$ Expectation is disturbed between calculation plot, and E[SINR _k] lower bound computing unit 213 calculates E[SINR under the ZF pattern by following Jeason inequality _k] lower bound:

$E\left[{\mathrm{SINR}}_k\right]\&GreaterEqual;\frac{\frac{P}{\left|S\right|}{\left|\right|h_{c,k}\left|\right|}^2{|\left({\hat{h}}_{c,k}{\hat{h}}_{c,k}^H\right)\left({\hat{h}}_{c,k}{\tilde{f}}_k\right)+e_k{\tilde{f}}_k|}^2}{1+w_{k}E\left[\underset{r}{\mathrm{\&Sigma;}}{H}_k^r\underset{t}{\mathrm{\&Sigma;}}{g}_t^r{\left(\underset{r}{\mathrm{\&Sigma;}}{H}_k^r\underset{t}{\mathrm{\&Sigma;}}{g}_t^r\right)}^H\right]w_k^H+\frac{P}{\left|S\right|}{\left|\right|h_{c,k}\left|\right|}^2{\sin }^2{\mathrm{\&theta;}}_{k}E\left[\underset{i\&Element;S\backslash \left\{k\right\}}{\mathrm{\&Sigma;}}{\left|{\tilde{e}}_k{\tilde{f}}_i\right|}^2\right]}$

$\&ap;\frac{\frac{P}{\left|S\right|}{\left|\right|h_{c,k}\left|\right|}^2{|\left({\hat{h}}_{c,k}{\hat{h}}_{c,k}^H\right)\left({\hat{h}}_{c,k}{\tilde{f}}_k\right)+e_k{\tilde{f}}_k|}^2}{1+w_k\left(\underset{j}{\mathrm{\&Sigma;}}{\left|H_k^j\right|}^2\right)w_k^H+\frac{P}{\left|S\right|}\frac{\left|S\right|-1}{M-1}{\left|\right|h_{c,k}\left|\right|}^2{\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">sin</figure-callout>}}^2{\mathrm{\&theta;}}_k}---\left(1\right)$

$\&ap;\frac{p_k{\left|\right|h_{c,k}\left|\right|}^2{\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">cos</figure-callout>}}^2{\mathrm{\&theta;}}_{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">k</figure-callout>}}}{1+w_k\left(\underset{j}{\mathrm{\&Sigma;}}{\left|H_k^j\right|}^2\right)w_k^H+\frac{P}{\left|S\right|}\frac{\left|S\right|-1}{M-1}{\left|\right|h_{c,k}\left|\right|}^2{\sin }^2{\mathrm{\&theta;}}_k}$

Wherein, H _k ^jRepresentative is from disturbing (for example, the physical antenna t of base station r, each physical antenna in the neighbor cell are the distracters to user k) physical channel to user k between the j cell/section.Here, suppose to be used for the permanent mould beam shaping Maximum Power Output always of the power amplifier of adjacent cells/sectors and each antenna, cover thereby increase.Because p _kFor user's the unknown, so the CQI of user k feedback γ _kBe defined as:

${\mathrm{\&gamma;}}_k\stackrel{\mathrm{\&Delta;}}{=}\frac{\frac{P}{\left|S\right|}{\left|\right|h_{c,k}\left|\right|}^2{\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">cos</figure-callout>}}^2{\mathrm{\&theta;}}_{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">k</figure-callout>}}}{1+w_k\left(\underset{j}{\mathrm{\&Sigma;}}{\left|H_k^j\right|}^2\right)w_k^H+\mathrm{\&alpha;}\frac{P}{\left|S\right|}\frac{\left|S\right|-1}{M-1}{\left|\right|h_{c,k}\left|\right|}^2{\sin }^2{\mathrm{\&theta;}}_k}---\left(2\right).$

Wherein, α is constant and 1≤α≤M-1.The approximate lower bound (2) of [SINR] of the expectation of user k can be rewritten as:

${\mathrm{\&gamma;}}_k=\frac{\frac{P}{\left|S\right|}{\left|w_k{H}_k{\hat{h}}_{c,k}^H\right|}^2}{1+w_k\left(\underset{j}{\mathrm{\&Sigma;}}{\left|H_k^j\right|}^2\right)w_k^H+\mathrm{\&alpha;}\frac{P}{\left|S\right|}\frac{\left|S\right|-1}{M-1}{\left|\right|w_k{H}_k-\left(w_k{H}_k{\hat{h}}_{c,k}^H\right){\hat{h}}_{c,k}\left|\right|}^2}---\left(3\right)$

After some matrixes are handled, can obtain ${\mathrm{\&gamma;}}_k=\frac{w_k{A}_k{\mathrm{<figure-callout\; id="1"\; label="w\; k\; H"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{kH}^{}}{1+w_k{B}_k{w}_k^H}---\left(4\right)$

Wherein,

$B_k=\mathrm{\&alpha;}\frac{P}{\left|S\right|}\frac{\left|S\right|-1}{M-1}\left(H_k(I-{\hat{h}}_{c,k}^H{\hat{h}}_{c,k})H_k^H\right)+\left(\underset{j}{\mathrm{\&Sigma;}}{\left|H_k^j\right|}^2\right)---\left(5\right)$

${\hat{h}}_{c,k}^H\&Element;C.$

The interference that obtains expecting by following equation (6):

According to following equation (7), the receiving combinator w of user k _kWith the compound channel vector that quantizes

Optimised.

$(w_k,{\hat{h}}_{c,k}^H)=\underset{\left|\right|w_k\left|\right|=1,{\hat{h}}_{c,k}^H\&Element;C}{\arg \max }{\mathrm{\&gamma;}}_k(w_k,{\hat{h}}_{c,k}^H)---\left(7\right)$

Replace the w in the equation (3) and (7) _k, can obtain the optimum channel quantization vector of user k by in code book C, carrying out exhaustive search ${\hat{h}}_{c,k}^H\&Element;C.$ Replace in the equation (6) Can obtain best of breed device w _kReplace in the equation (3)

And w _k, the CQI that can obtain user k feeds back γ _k

Be the pre-coding matrix index (PMI) that needs feedback.

Feedback unit 21 will obtain CQI and pre-coding matrix index sends to reflector 10.

Permanent mould beam shaping according to the present invention is ZF pattern and the PU that as above mentions ²The hybrid plan of RC pattern.ZF pattern and PU ²Switching between the RC pattern can be dynamic or semi-static.

The control signaling of multi-user MIMO system is described below.

The uplink control signaling that the control signaling is included in the downlink control signaling that carries in the physical downlink control channel (PDCCH) and carries in the line link control channel (PUCCH) physically.Permanent mould beam shaping according to the present invention is the mixing ZFPU that mentions ²RC MU-MIMO scheme.ZF pattern and PU ²Switching between the RC pattern can be dynamic or semi-static.PUCCH/PDCCH channel according to the present invention is supported respectively dynamically to switch and semi-static switching.

In order to support dynamic ZF-PU ²RC mode switch: proposed two kinds of code books that are used for permanent mould beam shaping, had the C1 of big codebook size and C2 with little codebook size.Should jointly design C1 and C2.For example code book C2 is the subclass of code book C1.By having code book C1 and parameter | the equation of S|=2 (2)-(7) obtain to be used for the CQI feedback γ of ZF pattern _k ^ZFQuantize feedback with compound channel

PU ²RC reuses the compound channel that is used for the ZF pattern and quantizes feedback.Yet, right with little code book C2

Further quantize.Will

Be mapped as

Further quantification treatment minimize based on the chordal distance of uncorrelated channel:

${\left({\hat{h}}_{c,k}^H\right)}_{{\mathrm{<figure-callout\; id="2"\; label="PU"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">PU</figure-callout>}}^2\mathrm{RC}}=\underset{\left|\right|q_i\left|\right|=1,q_i\&Element;{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">C</figure-callout>}}_2}{\arg \min }{\left|\right|{\left({\hat{h}}_{c,k}^H\right)}_{\mathrm{ZF}}{\left({\hat{h}}_{c,k}\right)}_{\mathrm{ZF}}-q_i{q}_i^H\left|\right|}_F---\left(8\right)$

Perhaps minimize

And the angle between the vector element among the code book C2 of correlated channels

${\left({\hat{h}}_{c,k}^H\right)}_{{\mathrm{<figure-callout\; id="2"\; label="PU"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">PU</figure-callout>}}^2\mathrm{RC}}=\underset{\left|\right|q_i\left|\right|=1,q_i\&Element;{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">C</figure-callout>}}_2}{\arg \max }\left|\right|{\left({\hat{h}}_{c,k}^H\right)}_{\mathrm{ZF}}{q}_i\left|\right|---\left(9\right)$

By having

And parameter | the equation of S|=M (3)-(7) obtain to be used for PU ²The user k's of RC

Feedback content in the up link is defined as γ subsequently _k ^ZF, Δ γ _kWith

Wherein, ${\mathrm{\&gamma;}}_k\stackrel{\mathrm{\&Delta;}}{=}\frac{2}{M}{\mathrm{\&gamma;}}_k^{\mathrm{ZF}}-{\mathrm{\&gamma;}}_{\mathrm{<figure-callout\; id="2"\; label="k\; PU"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">k</figure-callout>}}^{{\mathrm{PU}}^{}}$ Always on the occasion of.If base station (reflector) arranges two users simultaneously based on given standard, then transmit pattern based on ZF, and feedback content γ _k ^ZFWith

Can carry out ZF in the base station handles.If the base station arranges then to transmit based on PU more than two users simultaneously ²RC, and $\frac{2}{M}{\mathrm{\&gamma;}}_k^{\mathrm{ZF}}-\mathrm{\&Delta;}{\mathrm{\&gamma;}}_k,{\left({\hat{h}}_{c,k}^H\right)}_{\mathrm{ZF}}\&RightArrow;{\left({\hat{h}}_{c,k}^H\right)}_{{\mathrm{<figure-callout\; id="2"\; label="PU"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">PU</figure-callout>}}^2\mathrm{RC}}$ Can carry out PU in the base station ²RC handles.

In this case, when the feedback of receiver was not considered in the base station, user's set needed DRS (Dedicated Reference Signal) (DRS) to carry out the demodulation phase reference, should exist variable J (being represented by 1 bit) to indicate DRS to open in physical down link or closed.This will save the expense of DRS.

$J=\left\{\begin{array}{cc}0& \mathrm{<figure-callout\; id="1"\; label="scheduledUEshaveorthogonalFB"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">scheduledUEshaveorthogonalFB</figure-callout>}\\ 1& \mathrm{otherwise}\end{array}\right.---\left(10a\right)$

If J=1, then DRS should be opened, otherwise DRS should be closed.

In order to support semi-static ZF-PU ²The RC mode switch:

By having code book C1 and parameter | the equation of S|=2 (3)-(7) obtain to be used for the CQI feedback γ of ZF pattern _k ^ZFQuantize feedback with compound channel

Feedback content in the physical uplink link is defined as γ _k ^ZFWith

By having code book C2 and parameter | the equation of S|=M (3)-(7) obtain to be used for PU ²The CQI feedback of RC pattern

Quantize feedback with compound channel

Feedback content in the physical uplink link is defined as

With

In this case, do not consider receiver feedback and receiver needs DRS (Dedicated Reference Signal) (DRS) to carry out decode phase with reference to (this is at PU when the base station ²Can not take place in the RC pattern) time, in physical down link, should exist variable J (representing) to indicate DRS to be opened or to close by 1 bit.

$J=\left\{\begin{array}{cc}0& \mathrm{<figure-callout\; id="1"\; label="scheduledUEshaveorthogonalFB"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">scheduledUEshaveorthogonalFB</figure-callout>}\\ 1& \mathrm{otherwise}\end{array}\right.---\left(10b\right).$

If J=1, then DRS should be opened, otherwise DRS should be closed.

Beam shaping elements 12 receives after the CQI of user feedback, compute beam shaping weights.Beam shaping elements 12 is described below by the permanent mould ZF of three computation schemes beam shaping weights fk, thereby reduces the power loss that causes by the power imbalance.

At first analyze because the power loss that the power imbalance causes.

Traditional ZF sending metrix

Should be changed.

In the base station basis $E\left[{\mathrm{SINR}}_k\right]\&GreaterEqual;\frac{{\mathrm{\&gamma;}}_k}{{\left|\right|f_k\left|\right|}^2}$ Calibrate CQI feedback from user k (receiver).Yet, in the mimo system of reality, should satisfy strict more restriction $P_i\&le;\frac{P}{M}\&ForAll;i\&Element;\{1,...,M\}.$ Thereby should calibrate suitably in the base station to avoid destroying restriction from the CQI feedback of user k

$P_i\&le;\frac{P}{M}\&ForAll;i\&Element;\{1,...,M\}.$

$E\left[{\mathrm{SINR}}_k\right]\&GreaterEqual;\frac{{\mathrm{\&gamma;}}_k}{{\left|\right|f_k\left|\right|}^2{\mathrm{\&epsiv;}}_k}$

Wherein, ${\mathrm{\&epsiv;}}_k=\frac{\underset{i}{\max }{\left|f_k\left(i\right)\right|}^2}{{\left|\right|f_k\left|\right|}^2}\&CenterDot;\frac{\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="A2008102131210017H1.png"\; state="\{\{state\}\}">M</figure-callout>}}{1}$ And f _k(i) expression vector f _kThe i element.Pass through LO _k=|| f _k|| ²ε _kDefine the overall power loss of user k.If f _kBe permanent mould, then ε _k=1.If f _kNot permanent mould, then ε _k＞1

First scheme of the permanent mould ZF of calculating optimum beam shaping vector is described below.

Suppose to arrange simultaneously two user's sets (user k and user m).And, suppose ${\hat{h}}_{c,k}^H=v_i$ With ${\hat{h}}_{c,m}^H=v_j,$ V wherein _i∈ C, v _j∈ C, i ≠ j.Propose simple and progressive search procedure and made the near excellent f that is used for situation transmitting antenna M=4 _kHas given finite alphabet (N).Do not losing under the general situation, $f_k=\frac{1}{2}{\left[\begin{array}{cccc}1& e^{j{\mathrm{\&theta;}}_2}& e^{j{\mathrm{\&theta;}}_3}& e^{j{\mathrm{\&theta;}}_4}\end{array}\right]}^T,$ And suppose that each vector element among the code book C is kept by normalization $v\left(1\right)=1\&ForAll;v\&Element;C.$ Obtain nearly excellent permanent mould beam shaping vector f _kWith power loss LO _kProcess as shown in Figure 3.

At step S1, allow $v=\frac{1}{2}{\left[\begin{array}{cccc}1& e^{j{\mathrm{\&theta;}}_2}& e^{j{\mathrm{\&theta;}}_3}& e^{j{\mathrm{\&theta;}}_4}\end{array}\right]}^T,$ Wherein $v_j^H.v=0$ $v_j=\frac{1}{2}{\left[1\mathrm{\&alpha;\&beta;\&gamma;}\right]}^T.$

At step S2, order ${\mathrm{\&theta;}}_2=\frac{2\mathrm{\&pi;}}{N}.i,i=\mathrm{0,1},\mathrm{\&Lambda;},(N-1)\mathrm{loop},$

At step S3, judge

Whether equal 1, when equaling 1, at step S4, ${\mathrm{\&theta;}}_3=\frac{2\mathrm{\&pi;}}{N}.i,i=\mathrm{0,1},\mathrm{\&Lambda;},(N-1)\mathrm{loop}$ And $e^{j{\mathrm{\&theta;}}_4}=-\frac{\mathrm{\&beta;}*e^{j{\mathrm{\&theta;}}_3}}{\mathrm{\&gamma;}*}.$ Then, calculate T at step S5 ₁(θ ₂, θ ₃, θ ₄)=| v ^Hv _i|.

When

Be not equal at 1 o'clock, at step S6, $e^{j{\mathrm{\&theta;}}_4}=-\frac{\mathrm{\&alpha;}*e^{j{\mathrm{\&theta;}}_2}}{\mathrm{\&gamma;}*},$ $e^{j{\mathrm{\&theta;}}_3}=-\frac{1}{\mathrm{\&beta;}*},$ Calculate T at step S7 subsequently ₂(θ ₂, θ ₃, θ ₄)=| v ^Hv _i|.And work as

Be not equal at 1 o'clock, at step S8, $e^{j{\mathrm{\&theta;}}_3}=-\frac{\mathrm{\&alpha;}*e^{j{\mathrm{\&theta;}}_2}}{\mathrm{\&beta;}*},$ $e^{j{\mathrm{\&theta;}}_4}=-\frac{1}{\mathrm{\&gamma;}*},$ Calculate T at step S9 subsequently ₃(θ ₂, θ ₃, θ ₄)=| v ^Hv _i|.Then at step S10, (T1, T2 T3), and obtain corresponding θ to allow T=max ₂ ^Opt, θ ₃ ^Opt, θ ₄ ^Opt, $v_{\mathrm{opt}}=\frac{1}{2}{\left[\begin{array}{cccc}1& e^{j{\mathrm{\&theta;}}_2^{\mathrm{opt}}}& e^{j{\mathrm{\&theta;}}_3^{\mathrm{opt}}}& e^{j{\mathrm{\&theta;}}_4^{\mathrm{opt}}}\end{array}\right]}^T.$

The alternative plan of the permanent mould ZF of calculating according to the present invention beam shaping vector is described below.

Here, code book C is applied a restriction:

${\mathrm{\&Psi;}}_i=\left\{v_j\right|<v_j,v_i>=0,v_j\&Element;C\}\&NotEqual;\mathrm{\&Phi;}\&ForAll;v_i\&Element;C---\left(11\right)$

Suppose to arrange simultaneously user k and user m, the precoding vectors f of user k _kPrecoding vectors f with user m _mBe defined as:

$f_k=\frac{1}{|<{\hat{h}}_{c,k}^H,v_j>|}\underset{v_j\&Element;{\mathrm{\&Psi;}}_m}{\arg \max }|<{\hat{h}}_{c,k}^H,v_j>|---\left(12\right)$

$f_m=\frac{1}{|<{\hat{h}}_{c,m}^H,v_j>|}\underset{v_j\&Element;{\mathrm{\&Psi;}}_k}{\arg \max }|<{\hat{h}}_{c,m}^H,v_j>|---\left(13\right)$

Wherein,

${\mathrm{\&Psi;}}_m\stackrel{\mathrm{\&Delta;}}{=}\left\{v_j\right|<v_j,{\hat{h}}_{c,m}^H>=0,v_j\&Element;C\}---\left(14\right)$

${\mathrm{\&Psi;}}_k\stackrel{\mathrm{\&Delta;}}{=}\left\{v_j\right|<v_j,{\hat{h}}_{c,k}^H>=0,v_j\&Element;C\}---\left(15\right)$

And the power normalization coefficient that the signal of launching is applied Power Limitation P is

Wherein, | S|=2 is used to user k to distribute identical power with m.

For the alternative plan that calculates permanent mould ZF beam shaping vector, the emission code book is identical with the quantification code book.This mitigation for presence of intercell interference is helpful.

Can easily expand the alternative plan that calculates permanent mould ZF beam shaping vector and support the situation of rank＞2.Yet needing the number of nonopiate vector is 1.For example, user k, m and n are arranged (rank=3) simultaneously, and ${\hat{h}}_{c,m}^H\&perp;{\hat{h}}_{c,n}^H,$ For

With

${\hat{h}}_{c,k}^H=v_i$ It or not quadrature.So

$f_m={\hat{h}}_{c,m}^H,---\left(16\right)$

$f_n={\hat{h}}_{c,n}^H,---\left(17\right)$

$f_k=\frac{1}{|<{\hat{h}}_{c,k}^H,v_j>|}\underset{v_j\&Element;{\mathrm{\&Psi;}}_m\&cap;{\mathrm{\&Psi;}}_n}{\arg \max }|<{\hat{h}}_{c,k}^H,v_j>|---\left(18\right)$

Wherein,

${\mathrm{\&Psi;}}_m=\left\{v_j\right|<{\hat{h}}_{c,m}^H,v_j>=0\}---\left(19\right)$

${\mathrm{\&Psi;}}_n=\left\{v_j\right|<{\hat{h}}_{c,n}^H,v_j>=0\}---\left(20\right)$

The mitigation that keeps emission and the feature that quantizes shared identical code book better to carry out presence of intercell interference is very important.On the other hand, the alternative plan that calculates permanent mould ZF beam shaping vector can cause some losses of MU-MIMO link performance.Therefore, proposed ZF beam shaping, just calculated third party's case of permanent mould ZF beam shaping vector based on the two types compromise hybrid mode that is used for rank 2 emissions.

Class1: permanent mould beam shaping

$f_k=\underset{f_k}{\arg \min }\{{\mathrm{LO}}_k^{\mathrm{Alt}2-\mathrm{ZF}}\left(f_k\right),\mathrm{\&Gamma;}\&CenterDot;{\mathrm{LO}}_k^{\mathrm{Alt}1-\mathrm{ZF}}\left(f_k\right)\}---\left(21\right)$

Wherein, Γ is threshold value and Γ 〉=1.

Type 2: accurate permanent mould beam shaping

$f_k=\underset{f_k}{\arg \min }\{{\mathrm{LO}}_k^{\mathrm{Alt}2-\mathrm{ZF}}\left(f_k\right),\mathrm{\&Gamma;}\&CenterDot;{\mathrm{LO}}_k^{\mathrm{Conv}-\mathrm{ZF}}\left(f_k\right)\}---\left(22\right)$

Wherein, Γ is a threshold value, and Γ 〉=1.LO _k ^Conv-ZFThe overall loss of expression traditional Z F beam shaping.

According to closed loop multi-user MIMO system of the present invention, optimum linear combiner and CQI/ channel feedback have improved throughput performance, and the method for the permanent mould beam shaping of calculating according to the present invention vector is improved overall loss rate about 20% and is convenient to presence of intercell interference and slows down.

Although specifically shown and described the present invention with reference to exemplary embodiment, but it should be appreciated by those skilled in the art, under the situation that does not break away from the spirit and scope of the present invention that are defined by the claims, can carry out various changes on form and the details to it.

Claims (10)

1, a kind of closed loop constant modulus multi-user MIMO system comprises:

Reflector comprises:

User selection unit is used to select the user who serves;

Beam shaping elements, the channel quality information and the compound channel vector of the user feedback of receive selecting, and come compute beam shaping weights based on the information that receives;

Receiver, the user's set as the user comprises:

Feedback unit, the interference by calculation expectation comes feedback channel quality information and compound channel vector.

2, closed loop constant modulus multi-user MIMO system as claimed in claim 1 is characterized in that described feedback unit comprises:

Expectation interference calculation unit in minizone is passed through equation $w_{k}E\left[\underset{r}{\mathrm{\&Sigma;}}{H}_k^r\underset{t}{\mathrm{\&Sigma;}}{g}_t^r{\left(\underset{r}{\mathrm{\&Sigma;}}{H}_k^r\underset{t}{\mathrm{\&Sigma;}}{g}_t^r\right)}^H\right]w_k^H$ Expectation is disturbed between calculation plot;

The expectation interference calculation unit is passed through equation in the sub-district $\frac{P}{\left|S\right|}{\left|\right|h_{c,k}\left|\right|}^2{\sin }^2{\mathrm{\&theta;}}_{k}E\left[\underset{i\&Element;S\backslash \left\{k\right\}}{\mathrm{\&Sigma;}}{\left|{\tilde{e}}_k{\tilde{f}}_i\right|}^2\right]$ Calculate expectation interference in the sub-district under the ZF pattern, pass through equation $\frac{P}{|S}{\left|\right|h_{c,k}\left|\right|}^{2}E\left[\underset{i\&Element;S\backslash \left\{k\right\}}{\mathrm{\&Sigma;}}{|({\mathrm{\&alpha;}}_m{c}_m^{\left(l\right)}+\underset{n\&NotEqual;m}{\mathrm{\&Sigma;}}{\mathrm{\&alpha;}}_n{c}_n^{\left(l\right)})}^H{\tilde{f}}_i{|}^2\right]$ Calculate PU ²Expectation interference in the sub-district under the RC pattern;

E[SINR _k] the lower bound computing unit, calculate E[SINR under the ZF pattern by following formula _k] lower bound:

$E\left[\mathrm{SIN}{R}_k\right]\&GreaterEqual;\frac{\frac{P}{\left|S\right|}{\left|\right|h_{c,k}\left|\right|}^2{|\left({\hat{h}}_{c,k}{\hat{h}}_{c,k}^H\right)\left({\hat{h}}_{c,k}{\tilde{f}}_k\right)+e_k{\tilde{f}}_k|}^2}{1+w_{k}E\left[\underset{r}{\mathrm{\&Sigma;}}{H}_k^r\underset{t}{\mathrm{\&Sigma;}}{g}_t^r{\left(\underset{r}{\mathrm{\&Sigma;}}{H}_k^r\underset{t}{\mathrm{\&Sigma;}}{g}_t^r\right)}^H\right]w_k^H+\frac{P}{\left|S\right|}{\left|\right|h_{c,k}\left|\right|}^2{\sin }^2{\mathrm{\&theta;}}_{k}E\left[\underset{i\&Element;S\backslash \left\{k\right\}}{\mathrm{\&Sigma;}}{\left|{\tilde{e}}_k{\tilde{f}}_i\right|}^2\right]}$

$\&ap;\frac{\frac{P}{\left|S\right|}{\left|\right|h_{c,k}\left|\right|}^2{|\left({\hat{h}}_{c,k}{\hat{h}}_{c,k}^H\right)\left({\hat{h}}_{c,k}{\tilde{f}}_k\right)+e_k{\tilde{f}}_k|}^2}{1+w_k\left(\underset{j}{\mathrm{\&Sigma;}}{\left|H_k^j\right|}^2\right)w_k^H+\frac{P}{\left|S\right|}\frac{\left|S\right|-1}{M-1}{\left|\right|h_{c,k}\left|\right|}^2{\sin }^2{\mathrm{\&theta;}}_k},$

$\&ap;\frac{p_k{\left|\right|h_{c,k}\left|\right|}^2{\cos }^2{\mathrm{\&theta;}}_k}{1+w_k\left(\underset{j}{\mathrm{\&Sigma;}}{\left|H_k^j\right|}^2\right)w_k^H+\frac{P}{\left|S\right|}\frac{\left|S\right|-1}{M-1}{\left|\right|h_{c,k}\left|\right|}^2{\sin }^2{\mathrm{\&theta;}}_k}$

Calculate PU by following formula ²E[SINR under the RC pattern _k] lower bound:

$E\left[\mathrm{SIN}{R}_k\right]\&GreaterEqual;\frac{\frac{P}{\left|S\right|}{\left|\right|h_{c,k}\left|\right|}^2{\cos }^2{\mathrm{\&theta;}}_k}{1+w_{k}E\left[\underset{r}{\mathrm{\&Sigma;}}{H}_k^r\underset{t}{\mathrm{\&Sigma;}}{g}_t^r{\left(\underset{r}{\mathrm{\&Sigma;}}{H}_k^r\underset{t}{\mathrm{\&Sigma;}}{g}_t^r\right)}^H\right]w_k^H+\frac{P}{\left|S\right|}{\left|\right|h_{c,k}\left|\right|}^{2}E\left[\underset{i\&Element;S\backslash \left\{k\right\}}{\mathrm{\&Sigma;}}\right|{({\mathrm{\&alpha;}}_m{c}_m^{\left(l\right)}+\underset{n\&NotEqual;m}{\mathrm{\&Sigma;}}{\mathrm{\&alpha;}}_n{c}_n^{\left(l\right)})}^H{\tilde{f}}_i{|}^2]}$

$\&ap;\frac{\frac{P}{\left|S\right|}{\left|\right|h_{c,k}\left|\right|}^2{\cos }^2{\mathrm{\&theta;}}_k}{1+w_k\left(\underset{j}{\mathrm{\&Sigma;}}{\left|H_k^j\right|}^2\right)w_k^H+\frac{P}{\left|S\right|}\frac{C_{M-2}^{\left|S\right|-2}}{C_{M-1}^{\left|S\right|-1}}{\left|\right|h_{c,k}\left|\right|}^2{\sin }^2{\mathrm{\&theta;}}_k}$

$\&ap;\frac{\frac{P}{\left|S\right|}{\left|\right|h_{c,k}\left|\right|}^2{\cos }^2{\mathrm{\&theta;}}_k}{1+w_k\left(\underset{j}{\mathrm{\&Sigma;}}{\left|H_k^j\right|}^2\right)w_k^H+\frac{P}{\left|S\right|}\frac{\left|S\right|-1}{M-1}{\left|\right|h_{c,k}\left|\right|}^2{\sin }^2{\mathrm{\&theta;}}_k}.$

3, closed loop constant modulus multi-user MIMO system as claimed in claim 2 is characterized in that described feedback unit comes the calculating channel quality information by following formula:

${\mathrm{\&gamma;}}_k=\frac{\frac{P}{\left|S\right|}{\left|w_k{H}_k{\hat{h}}_{c,k}^H\right|}^2}{1+w_k\left(\underset{j}{\mathrm{\&Sigma;}}{\left|H_k^j\right|}^2\right)w_k^H+\mathrm{\&alpha;}\frac{P}{\left|S\right|}\frac{\left|S\right|-1}{M-1}{\left|\right|w_k{H}_k-\left(w_k{H}_k{\hat{h}}_{c,k}^H\right){\hat{h}}_{c,k}\left|\right|}^2}.$

4, closed loop constant modulus multi-user MIMO system as claimed in claim 3 is characterized in that described feedback unit optimizes the compound channel vector of quantification according to following formula

$(w_k,{\hat{h}}_{c,k}^H)=\underset{\left|\right|w_k\left|\right|=1,{\hat{h}}_{c,k}^H\&Element;c}{\arg \max }{\mathrm{\&gamma;}}_k(w_k,{\hat{h}}_{c,k}^H).$

5, closed loop constant modulus multi-user MIMO system as claimed in claim 1 is characterized in that having under the situation of 4 transmit antennas when reflector, and described beam shaping elements obtains the beam shaping weights by following formula:

$f_k=\frac{1}{2}{\left[\begin{array}{cccc}1& e^{j{\mathrm{\&theta;}}_2}& e^{j{\mathrm{\&theta;}}_3}& e^{j{\mathrm{\&theta;}}_4}\end{array}\right]}^T.$

6, closed loop constant modulus multi-user MIMO system as claimed in claim 1 is characterized in that described beam shaping elements applies restriction a: Ψ to code book C when user selection unit is selected two user's set services _i={ v _j|＜v _j, v _i〉=0, v _j∈ C} ≠ Φ $\&ForAll;v_i\&Element;C$ And come compute beam shaping weights by following formula:

$f_k=\frac{1}{|<{\hat{h}}_{c,k}^H,v_j>|}\underset{v_j\&Element;{\mathrm{\&Psi;}}_m}{\arg \max }|<{\hat{h}}_{c,k}^H,v_j>|$

$f_m=\frac{1}{|<{\hat{h}}_{c,m}^H,v_j>|}\underset{v_j\&Element;{\mathrm{\&Psi;}}_k}{\arg \max }|<{\hat{h}}_{c,m}^H,v_j>|$

Wherein,

${\mathrm{\&Psi;}}_m\stackrel{\mathrm{\&Delta;}}{=}\left\{v_j\right|<v_j,{\hat{h}}_{c,m}^H>=0,v_j\&Element;C\}$

${\mathrm{\&Psi;}}_k\stackrel{\mathrm{\&Delta;}}{=}\left\{v_j\right|<v_j,{\hat{h}}_{c,k}^H>=0,v_j\&Element;C\}$

And f _kThe permanent mould ZF beam shaping weights of expression user's set k, f _mThe permanent mould ZF beam shaping weights of expression user's set m.

7, closed loop constant modulus multi-user MIMO system as claimed in claim 1 is characterized in that described beam shaping elements comes compute beam shaping weights by following formula when user selection unit is selected more than two user's set services:

$f_m={\hat{h}}_{c,m}^H,$

$f_n={\hat{h}}_{c,n}^H,$

$f_k=\frac{1}{|<{\hat{h}}_{c,k}^H,v_j>|}\underset{v_j\&Element;{\mathrm{\&Psi;}}_m\&cap;{\mathrm{\&Psi;}}_n}{\arg \max }|<{\hat{h}}_{c,k}^H,v_j>|$

Wherein,

${\mathrm{\&Psi;}}_m=\left\{v_j\right|<{\hat{h}}_{c,m}^H,v_j>=0\}$

${\mathrm{\&Psi;}}_n=\left\{v_j\right|<{\hat{h}}_{c,n}^H,v_j>=0\}$

And f _mThe permanent mould ZF beam shaping weights of expression user's set m, f _nThe permanent mould ZF beam shaping weights of expression user's set n, f _kThe permanent mould ZF beam shaping weights of expression user's set k.

8, closed loop constant modulus multi-user MIMO system as claimed in claim 1 is characterized in that described beam shaping elements comes compute beam shaping weights by the equation of the following first kind and second type:

The first kind: $f_k=\underset{f_k}{\arg \min }\{{\mathrm{LO}}_k^{\mathrm{Alt}2-\mathrm{ZF}}\left(f_k\right),\mathrm{\&Gamma;}\&CenterDot;{\mathrm{LO}}_k^{\mathrm{Alt}1-\mathrm{ZF}}\left(f_k\right)\}$

Second type: $f_k=\underset{f_k}{\arg \min }\{{\mathrm{LO}}_k^{\mathrm{Alt}2-\mathrm{ZF}}\left(f_k\right),\mathrm{\&Gamma;}\&CenterDot;{\mathrm{LO}}_k^{\mathrm{Conv}-\mathrm{ZF}}\left(f_k\right)\}$

Wherein, Γ is threshold value and Γ 〉=1, LO _K ^Alt1-ZFThe power loss of the ZF beam shaping of expression during according to claim 5 compute beam shaping weights, LO _K ^Alt2-ZFThe power loss of the ZF beam shaping of expression during according to claim 6 compute beam shaping weights, LO _k ^Conv-ZFThe overall loss of expression traditional Z F beam shaping.

9, a kind of control signal processing method that is used for closed loop constant modulus multi-user MIMO system as claimed in claim 1, when starting the dynamic mode switching:

In up signaling control and treatment, the user feedback content is γ _k ^ZF, Δ γ _kWith

Wherein ${\mathrm{\&Delta;\&gamma;}}_k=\frac{2}{M}{\mathrm{\&gamma;}}_k^{\mathrm{ZF}}-{\mathrm{\&gamma;}}_k^{{\mathrm{PU}}^2\mathrm{RC}},$ If reflector is selected two user's services, then launch based on the ZF pattern, utilize feedback content γ at reflector _k ^ZFWith

Realize that ZF handles, if reflector is selected more than two users, then based on PU ²The RC pattern is launched, and in the reflector utilization

${\left({\hat{h}}_{c,k}^H\right)}_{\mathrm{ZF}}\&RightArrow;{\left({\hat{h}}_{c,k}^H\right)}_{{\mathrm{PU}}^2\mathrm{RC}}$ Realize PU ²RC handles,

Wherein, by having code book C1 and parameter | γ is calculated in following equation (1)-(3) of S|=2 _k ^ZFWith

${\mathrm{\&gamma;}}_k=\frac{w_k{A}_k{w}_k^H}{1+w_k{B}_k{w}_k^H}---\left(1\right)$

Wherein, $A_k=\frac{P}{\left|S\right|}\left(H_k{\hat{h}}_{c,k}^H{\hat{h}}_{c,k}{H}_k^H\right)$

$B_k=\mathrm{\&alpha;}\frac{P}{\left|S\right|}\frac{\left|S\right|-1}{M-1}\left(H_k(I-{\hat{h}}_{c,k}^H{\hat{h}}_{c,k})H_k^H\right)+\left(\underset{j}{\mathrm{\&Sigma;}}{\left|H_k^j\right|}^2\right){\hat{h}}_{c,k}^H\&Element;C$

$w_k^H={(I+B_k)}^{-1}\sqrt{\frac{P}{\left|S\right|}}{H}_k{\hat{h}}_{c,k}^H---\left(2\right)$

$(w_k,{\hat{h}}_{c,k}^H)=\underset{\left|\right|w_k\left|\right|=1,{\hat{h}}_{c,k}^H\&Element;c}{\arg \max }{\mathrm{\&gamma;}}_k(w_k,{\hat{h}}_{c,k}^H)---\left(3\right),$

Obtain by following equation (4) or (5) ${\left({\hat{h}}_{c,k}^H\right)}_{\mathrm{ZF}}\&RightArrow;{\left({\hat{h}}_{c,k}^H\right)}_{{\mathrm{PU}}^2\mathrm{RC}}:$

${\left({\hat{h}}_{c,k}^H\right)}_{{\mathrm{PU}}^2\mathrm{RC}}=\underset{\left|\right|q_i\left|\right|=1,q_i\&Element;C_2}{\arg \min }{\left|\right|{\left({\hat{h}}_{c,k}^H\right)}_{\mathrm{ZF}}{\left({\hat{h}}_{c,k}\right)}_{\mathrm{ZF}}-q_i{q}_i^H\left|\right|}_F---\left(4\right)$

${\left({\hat{h}}_{c,k}^H\right)}_{{\mathrm{PU}}^2\mathrm{RC}}=\underset{\left|\right|q_i\left|\right|=1,q_i\&Element;C_2}{\arg \max }\left|\right|{\left({\hat{h}}_{c,k}^H\right)}_{\mathrm{ZF}}{q}_i\left|\right|---\left(5\right),$

Simultaneously by having

And parameter | the equation of S|=M (1)-(2) obtain Wherein, code book C ₁Has the C of ratio ₂Bigger codebook size.

10, control signal processing method as claimed in claim 9 is characterized in that also comprising: in physical down link, open or close DRS (Dedicated Reference Signal) by 1 bit indicator.

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