CN103036601A - Method and device for determining rank indication and pre-coding matrix index - Google Patents

Abstract

The invention relates to the mobile communication field and discloses a method for determining a rank indication and a pre-coding matrix index. The method includes: receiving neighborhood common reference signals coming from a base station; obtaining the rank indication (RI) with drawable values and the pre-coding matrix index (PMI) with drawable values according to an transmitting antenna configured on a base side; reconstructing the neighborhood common reference signals according to the RI with drawable values, the PMI with drawable values and the received neighborhood common reference signals; performing multiple-input-multiple-output (MIMO) signal detection for the constructed neighborhood common reference signals; and determining the RI and the PMI according to the MIMO signal detection result. The invention further discloses a device for determining the rank indication and the pre-coding matrix index. The device comprises a receiving module, an obtaining module, a construction module, a detection module and a determination module. By aid of the device and the method, the RI and the PMI can be accurately determined; and simultaneously the RI and the PMI are determined according to the MIMO signal detection result, and the influence of fast channel environment change is overcome.

Description

The method and apparatus of a kind of definite order indication and pre-coding matrix index

Technical field

The present invention relates to moving communicating field, relate in particular to the method and apparatus of a kind of definite order indication and pre-coding matrix index

Background technology

At LTE (Long Term Evolution, Long Term Evolution) and follow-up evolution system adopted MIMO (Multiple InputMultiple Output, multiple-input and multiple-output) technology increases power system capacity, and the MIMO technology mainly is that the uncorrelated characteristic according to transmission channel between a plurality of transmitting antennas improves message transmission rate.Send simultaneously after being specially PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel) the data process precoding of many antenna configurations with one or more layers that utilizes transmitting terminal.According to different channel circumstances, transmitting terminal is dynamically adjusted PDSCH and is sent the number of plies of data and pre-coding matrix to reach the purpose that power system capacity is provided.

In the MIMO precoding technique, PDSCH sends the available following formula of relation of data X, pre-coding matrix W, receive data Y and channel matrix H and briefly describes:

Y=HWX+n ₀Formula (1)

Suppose that the reception antenna number is R, number of transmit antennas is T, and the number of plies of pre-coding matrix is L; Then Y is the matrix of R * 1, and H is the matrix of R * T, and W is the matrix of T * L, and X is the matrix of L * 1, white Gaussian noise n ₀Matrix for R * 1.

In LTE and evolution system thereof, for effective use MIMO precoding is calculated, terminal need to be carried out by the downlink information that receives reporting of channel condition information RI (Rank Indicator, order indication) and PMI (Precoding Matrix Index, pre-coding matrix index).Wherein, RI is used for determining the number of plies of transmitting terminal PDSCH data, and PMI is used for determining the index of the concentrated pre-coding matrix of code book.In LTE and evolution system thereof, the channel feedback information RI that reports and PMI need to calculate in whole bandwidth, and the bandwidth of distributing to the user is limited, if only utilize the PDSCH data message of user assignment can not know channel feedback information on the whole transmission bandwidth.Therefore, need utilization to carry out the estimation of channel feedback information at the residential quarter public reference signal CCRS (Cell Common Reference Signals) that whole bandwidth is transmitted.But the residential quarter public reference signal in LTE and the evolution system thereof does not carry out the MIMO precoding, if the estimation of directly using the residential quarter public reference signal to carry out channel feedback information can not accurately reflect channel feedback information.Patent 200880102800.7 " method that is used for the blind Detecting pre-coding matrix index " directly utilizes the cell reference signals of reception and local cell reference signals to compare the pre-coding matrix that uses with in the blind check communication.The method can not be distinguished different spatial coherences, therefore must can carry out the blind check of PMI based on known RI information.Because the method directly uses the cell reference signals of reception and home cell reference signal to compare the impact that is subject to the channel circumstance variation, thereby so that the PMI accuracy of blind check is not high yet.Utilize the SINR (Signal to Interference plusNoise Ratio) of each layer of estimating to carry out the estimation of RI and PMI in the patent 200910084242.2 " determining method and the device of channel feedback information in the LTE system ".The method is not considered the portfolio effect of MIMO receiver, so that the impact that the RI that estimates and PMI are subject to channel circumstance.

Summary of the invention

The invention provides the method and apparatus of a kind of definite order indication and pre-coding matrix index, to solve the problem that to determine exactly order indication and pre-coding matrix index in the prior art.

The invention provides the method for a kind of definite order indication and pre-coding matrix index, the method comprises: receive the residential quarter public reference signal from the base station; But but obtain the order indication RI of value and the pre-coding matrix index PMI of value according to the number of transmit antennas of base station configuration; But but re-construct the residential quarter public reference signal according to the PMI of the RI value of described value and the residential quarter public reference signal of reception; Residential quarter public reference signal to described structure carries out multiple-input and multiple-output MIMO input; Determine RI and PMI according to described MIMO signal detecting result.

Preferably, described residential quarter public reference signal comprises: cell reference signals CRS or channel state information reference signals CSI-RS.

Preferably, but described number of transmit antennas according to base station configuration chooses the RI of value and but the PMI of value is specially: when the number of transmit antennas of described base station configuration is T, the span of RI be 1,2 ..., T}; When T=RI=2, the span of PMI is { 1,2}; When the number of transmit antennas of described base station configuration is other situations that T and order are designated as RI, the span of PMI be 0,1 ..., 2 ^T-1}.

Preferably, but re-construct the residential quarter public reference signal according to RI, the PMI of described value and described residential quarter public reference signal and be specially: described residential quarter public reference signal is carried out precoding merges, obtain the residential quarter public reference signal through structure.

Preferably, describedly re-construct the residential quarter public reference signal according to described RI, PMI and described residential quarter public reference signal and be specially: Wherein, CCRS_Rec _{R, t}The residential quarter public reference signal that the transmitting antenna t that expression reception antenna r receives sends; y _rThe residential quarter public reference signal of the reception antenna r that the expression structure obtains; w _tThe expression pre-coding matrix, its line number is that T, columns are RI.

Preferably, when RI=1, adopt residential quarter public reference signal identical on each transmitting antenna to construct described residential quarter public reference signal, the columns of pre-coding matrix is 1; When RI ≠ 1, adopt residential quarter public reference signals different on each transmitting antenna to construct described residential quarter public reference signal, the columns of pre-coding matrix is RI.

Preferably, when described residential quarter public reference signal was the CRS signal, identical residential quarter public reference signal referred to the CRS signal on the immediate frequency domain position of identical OFDM symbol on each transmitting antenna on described each transmitting antenna; Different residential quarter public reference signals refers to following any situation on described each transmitting antenna: the CRS signal on the different frequency domain positions of identical OFDM symbol on the CRS signal on the different frequency domain positions of different OFDM symbols or each transmitting antenna on the different locational CRS of OFDM symbol same frequency or each transmitting antenna on each transmitting antenna; When described residential quarter public reference signal was the CSI-RS signal, identical residential quarter public reference signal referred to the CSI-RS signal on the identical OFDM symbol on each transmitting antenna on described each transmitting antenna; Different residential quarter public reference signals refers to the CSI-RS signal on the different OFDM symbols on each transmitting antenna on described each transmitting antenna.

Preferably, describedly determine that according to the MIMO signal detecting result RI and PMI are specially: determine RI and PMI according to the residential quarter public reference signal estimated value that described MIMO input obtains; Or the residential quarter public reference signal estimated value that obtains according to described MIMO input and home cell public reference signal are determined RI and PMI jointly.

The present invention also provides the device of a kind of definite order indication and pre-coding matrix index, and this device comprises: receiver module is used for receiving the residential quarter public reference signal from the base station; Acquisition module, but but be used for obtaining the order indication RI of value and the pre-coding matrix index PMI of value according to the number of transmit antennas of base station configuration; Constructing module, but but be used for re-constructing the residential quarter public reference signal according to the PMI of the RI value of described value and the residential quarter public reference signal of reception; Detection module is used for the residential quarter public reference signal of described structure is carried out multiple-input and multiple-output MIMO input; Determination module is used for determining RI and PMI according to described MIMO signal detecting result

Preferably, described residential quarter public reference signal comprises: described residential quarter public reference signal comprises: cell reference signals CRS or channel state information reference signals CSI-RS.

Preferably, but re-constructing the residential quarter public reference signal according to the residential quarter public reference signal of RI, the PMI of described value and described reception is specially: the residential quarter public reference signal of described reception is carried out precoding merge, obtain the residential quarter public reference signal through structure.

Preferably, described residential quarter public reference signal according to described RI, PMI and described reception re-constructs the residential quarter public reference signal and is specially: Wherein, CCRS_Rec _{R, t}The residential quarter public reference signal that the transmitting antenna t that expression reception antenna r receives sends; y _rThe residential quarter public reference signal of the reception antenna r that the expression structure obtains; w _tThe expression pre-coding matrix, its line number is that T, columns are RI.

The method and apparatus of a kind of definite order indication provided by the invention and pre-coding matrix index, precoding sending method by simulation residential quarter public reference signal, the residential quarter public reference signal of structure has the characteristics of each RI/PMI of traversal, effectively reduce the transmission course of precoding, solved the residential quarter public reference signal is not difficult to reflect RI and PMI channel feedback information through precoding limitation problem.Simultaneously, based on to structure residential quarter public reference signal carry out the MIMO input, determine RI/PMI according to the MIMO signal detecting result, embodied the MIMO receiver and overcome the feature that channel fading changes, overcome the fast-changing impact of channel circumstance.

Description of drawings

Fig. 1 is the method flow diagram that the embodiment of the invention is determined order indication and pre-coding matrix index;

Fig. 2 is the device flow chart that the embodiment of the invention is determined order indication and pre-coding matrix index;

Fig. 3 is cell reference signals CRS mapping schematic diagram when two antennas send in the embodiment of the invention;

Fig. 4 is that two antennas send and during RI=1 in the embodiment of the invention, cell reference signals CRS organigram.

Embodiment

In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, below in conjunction with the drawings and specific embodiments the technical scheme among the present invention is further described and illustrates.

S101, receive the residential quarter public reference signal from the base station;

Wherein, described residential quarter public reference signal (Cell Common Reference Signals, CCRS) comprising: CRS signal (Cell Reference Signals, cell reference signals) and CSI-RS signal (Channel-State InformationReference Signals, channel state information reference signals), wherein the CSI-RS signal just may send when only 8 antennas send in the base station.

For cell reference signals CRS, for conventional CP (Cyclic Prefix, Cyclic Prefix), the CRS reference signal sends at the OFDM of each time slot symbol 0 and OFDM symbol 4, each RB (Resource Block, Resource Block) there are two RE (Resource Element, resource particle) to be used for the transmission of CRS on.Following features according to the CRS signal that sends in LTE and the evolution system thereof: corresponding certain antenna of the first sends the RE of CRS, and other antennas do not send any information in this RE position, as shown in Figure 3 and Figure 4; Therefore can obtain the CRS signal of each transmitting antenna of receiving on each reception antenna, it two is that the upper CRS symbol that sends of two RE identical or adjacent in the same RB of the same OFDM symbol of different antennae mouth is identical, namely can obtain the expression formula that terminal receives from the descending cell reference signals CRS of base station to be:

CRS_Rec _{R, t}=H _{R, t}CRS _t+ n ₀Formula (2)

Wherein, CRS_Rec _{R, t}The CRS signal that the transmitting antenna t that expression reception antenna r receives sends, H _{R, t}Expression transmitting antenna t is to the transmission matrix of reception antenna r, n ₀The expression white Gaussian noise.

For downlink channel condition information reference signal CSI-RS, following features according to the CSI-RS that sends in the LTE evolution system: only send a CSI-RS symbol in the same RB of the same OFDM symbol of first different antennae mouth, the identical or opposite number each other of the CSI-RS value of symbol in the same RB of the same OFDM symbol of different antennae mouth.It two is that to send the RE position of CSI-RS on continuous two the OFDM symbols of corresponding certain antenna opening identical, and an other antenna that sends CSI-RS in the same RE position CSI-RS value of symbol that first OFDM symbol that contains CSI-RS sends on CSI-RS that first OFDM symbol that contains CSI-RS sends and this antenna is identical; The CSI-RS value of symbol that an other antenna that sends CSI-RS in same RE position second OFDM symbol that contains CSI-RS on CSI-RS that second OFDM symbol that contains CSI-RS sends and this antenna sends is opposite.Therefore can obtain the CSI-RS signal of each transmitting antenna of receiving on each reception antenna.Then can obtain the expression formula that terminal receives from the descending cell reference signals CSI-RS of base station is:

CSI_Rec _{R, 1th}=H _{R, t}(1th) CSI _t+ H _{R, t+1}(1th) CSI _T+1+ n ₀Formula (3)

CSI_Rec _r，2nd＝H _r，t(2nd)·CSI _t-H _r，t+1(2nd)·CSI _t+1+n ₁

Wherein, CSI_Rec _{R, 1th}First contains the CSI-RS signal on the OFDM symbol of CSI-RS signal in the upper subframe of the transmitting antenna t that expression reception antenna r receives and transmitting antenna t+1.CSI_Rec _{R, 2nd}CSI-RS signal in the upper subframe of the transmitting antenna t that expression reception antenna r receives and transmitting antenna t+1 on second OFDM symbol that contains the CSI-RS signal; CSI _tAnd CSI _T+1Represent respectively the CSI-RS signal that sends on t and t+1 the antenna opening; H _{R, t}And H _{R, t+1}Represent that respectively t and t+1 antenna opening are to the channel matrix of reception antenna r.

Because, H _{R, t}(1th) and H _{R, t}(2nd), H _{R, t+1}(1th) and H _{R, t+1}(2nd) only have the spacing of an OFDM symbol in time domain, therefore can think H _{R, t}(1th) and H _{R, t}Identical (2nd), H _{R, t+1}(1th) and H _{R, t+1}Also be identical (2nd).Therefore formula (3) can be reduced to:

CSI_Rec _{R, 1th}=H _{R, t}CSI _t+ H _{R, t+1}CSI _T+1+ n ₀Formula (4)

CSI_Rec _r，2nd＝H _r，t·CSI _t-H _r，t+1·CSI _t+1+n ₁

Therefore, can obtain CSI-RS signal on each transmitting antenna that each reception antenna receives according to formula (4).

But S102, determine RI (Rank Indicator, order indication) and the PMI (Precoding Matrix Index, pre-coding matrix index) of value according to the number of transmit antennas of base station end configuration;

Wherein, the number of transmit antennas of base station end can be configured to 2,4 and 8 in LTE and follow-up evolution system thereof, under the different antenna configurations RI and PMI choose different.When the antenna number of base station end configuration is T, RI can value 1,2 ..., T}.When T=RI=2, pre-coding matrix PMI can value { 1,2}; Be other situations that T and order are designated as RI for number of transmit antennas, pre-coding matrix PMI can value 0,1 ..., 2 ^T-1}.

But the residential quarter public reference signal of S103, the RI according to described value, PMI and described reception re-constructs the residential quarter public reference signal;

Wherein, structure residential quarter public reference signal is specially:

Residential quarter public reference signal to described reception carries out the precoding merging, obtains the residential quarter public reference signal through structure.

Namely merge by the residential quarter public reference signal in the precoding related blocks being carried out precoding, simulate the method for precoding identical with the PDSCH data precoding, obtain the residential quarter public reference signal through structure.

Wherein, the precoding related blocks is defined as: in 2 transmitting antenna situations, the present invention defines the precoding related blocks: the running time-frequency resource that comprises CRS, take a slot length on the time domain, take the frequency band that 6 subcarrier spacings contain two CRS signals on the frequency domain, wherein part shown in the dotted line of Fig. 3 lower left corner is the precoding related blocks; In 4 transmitting antenna situations, the present invention defines the precoding related blocks and is: comprise the running time-frequency resource of CRS, take 1 slot length on the time domain, take the frequency band of a Resource Block on the frequency domain; In 8 transmitting antenna situations, the present invention defines the precoding related blocks and is: comprise the running time-frequency resource of CSI-RS, take 2 OFDM symbol lengths on the time domain, take the frequency band of a Resource Block on the frequency domain.

Wherein, the building method of residential quarter public reference signal is:

$y_r=\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\mathrm{CCRS}\_{\mathrm{Rec}}_{r,t}\·w_t$ Formula (5)

Wherein, CCRS_Rec _{R, t}The residential quarter public reference signal that the transmitting antenna t that expression reception antenna r receives sends; y _rThe residential quarter public reference signal of the reception antenna r that the expression structure obtains; w _tThe expression pre-coding matrix, line number is T, columns is the number of plies, also is RI; When the number of plies and number of transmit antennas value not simultaneously, CCRS_Rec _{R, t}And w _tSelection also different.

Wherein, when the residential quarter public reference signal that receives is CRS,

(1) RI is 1 o'clock, and the building method of cell reference signals is:

When RI is 1 number of transmit antennas when being T, suppose that pre-coding matrix is $w=\left[\begin{array}{c}{w}_0\\ {\mathrm{<figure-callout\; id="1"\; label="w"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">w</figure-callout>}}_1\\ \&CenterDot;\&CenterDot;\&CenterDot;\\ w_T\end{array}\right],$ To different PMI, the w value is different.

According to the method for precoding of PDSCH data, reception antenna n structure through the CRS signal of precoding is:

y _n=CRS_Rec _N0W ₀+ CRS_Rec _N1W ₁+ ...+CRS_Rec _NTW _TFormula (6)

Utilize the upper identical CRS of getting of CRS that sends of two adjacent on the same OFDM symbol of different antennae mouth RE ₀=CRS ₁=...=CRS _T, CRS _iBe illustrated in the cell reference signals that antenna opening i sends.Again because, CRS_Rec _N0=h _N0CRS ₀, CRS_Rec _N1=h _N0CRS ₁, CRS_Rec _NT=h _NTR _TTherefore the immediate CRS signal of frequency domain position of identical OFDM symbol on two transmitting antennas that receive on the same reception antenna being carried out precoding merges and can get y _n, y _nBe expressed as:

$y_n={\mathrm{<figure-callout\; id="0"\; label="CRS"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">CRS</figure-callout>}}_0\&CenterDot;{\mathrm{<figure-callout\; id="0"\; label="h\; n"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">h</figure-callout>}}_n\&CenterDot;{\mathrm{<figure-callout\; id="0"\; label="w"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">w</figure-callout>}}_0+{\mathrm{<figure-callout\; id="0"\; label="CRS"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">CRS</figure-callout>}}_0\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="h\; n"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">h</figure-callout>}}_n\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="w"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">w</figure-callout>}}_1+{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">n</figure-callout>}}_0$

$=\left[\begin{array}{cccc}{h}_{n0}& {\mathrm{<figure-callout\; id="1"\; label="h\; n"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">h</figure-callout>}}_n& \&CenterDot;\&CenterDot;\&CenterDot;& h_{\mathrm{nT}}\end{array}\right]\&CenterDot;\left[\begin{array}{c}{w}_0\\ {\mathrm{<figure-callout\; id="1"\; label="w"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">w</figure-callout>}}_1\\ \&CenterDot;\&CenterDot;\&CenterDot;\\ w_T\end{array}\right]\&CenterDot;{\mathrm{<figure-callout\; id="0"\; label="CRS"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">CRS</figure-callout>}}_0+{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">n</figure-callout>}}_0$ Formula (7)

Contrast (7) and formula (1) can find out that the CRS through precoding of structure has the method for precoding identical with the PDSCH data.Work as L=1, during T=2, the organigram of the CRS of the process precoding of structure as shown in Figure 4.

When (2) RI was L (L＞1), the building method of cell reference signals was:

When RI is L number of transmit antennas when being T, suppose that pre-coding matrix is $w=\left[\begin{array}{cccc}{w}_{00}& w_{01}& \&CenterDot;\&CenterDot;\&CenterDot;& w_{0L}\\ w_{10}& w_{11}& \&CenterDot;\&CenterDot;\&CenterDot;& w_{1L}\\ \&CenterDot;\&CenterDot;\&CenterDot;& \&CenterDot;\&CenterDot;\&CenterDot;& \&CenterDot;\&CenterDot;\&CenterDot;& \&CenterDot;\&CenterDot;\&CenterDot;\\ w_{T0}& {\mathrm{<figure-callout\; id="1"\; label="w\; T"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">w</figure-callout>}}_T& \&CenterDot;\&CenterDot;\&CenterDot;& w_{\mathrm{TL}}\end{array}\right],$ To different PMI, the w value is different.The method for precoding of PDSCH data can be expressed as:

$\left[\begin{array}{c}{y}_0\\ {\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">y</figure-callout>}}_1\\ \&CenterDot;\&CenterDot;\&CenterDot;\\ y_R\end{array}\right]=\mathrm{HWD}=\left[\begin{array}{cccc}{h}_{00}& h_{01}& \&CenterDot;\&CenterDot;\&CenterDot;& h_{0T}\\ h_{10}& h_{11}& \&CenterDot;\&CenterDot;\&CenterDot;& h_{1T}\\ \&CenterDot;\&CenterDot;\&CenterDot;& \&CenterDot;\&CenterDot;\&CenterDot;& \&CenterDot;\&CenterDot;\&CenterDot;& \&CenterDot;\&CenterDot;\&CenterDot;\\ h_{R0}& {\mathrm{<figure-callout\; id="1"\; label="h\; R"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">h</figure-callout>}}_R& \&CenterDot;\&CenterDot;\&CenterDot;& h_{\mathrm{RT}}\end{array}\right]\left[\begin{array}{cccc}{w}_{00}& w_{01}& \&CenterDot;\&CenterDot;\&CenterDot;& w_{0L}\\ w_{10}& w_{11}& \&CenterDot;\&CenterDot;\&CenterDot;& w_{1L}\\ \&CenterDot;\&CenterDot;\&CenterDot;& \&CenterDot;\&CenterDot;\&CenterDot;& \&CenterDot;\&CenterDot;\&CenterDot;& \&CenterDot;\&CenterDot;\&CenterDot;\\ w_{T0}& {\mathrm{<figure-callout\; id="1"\; label="w\; T"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">w</figure-callout>}}_T& \&CenterDot;\&CenterDot;\&CenterDot;& w_{\mathrm{TL}}\end{array}\right]\left[\begin{array}{c}{D}_0\\ {\mathrm{<figure-callout\; id="1"\; label="D"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">D</figure-callout>}}_1\\ \&CenterDot;\&CenterDot;\&CenterDot;\\ D_L\end{array}\right]$ Formula (8)

When T=R=L=2, formula (8) is expressed as:

$\left[\begin{array}{c}{y}_0\\ {\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">y</figure-callout>}}_1\end{array}\right]=\mathrm{HWD}=\left[\begin{array}{cc}{h}_{00}& h_{01}\\ h_{10}& h_{11}\end{array}\right]\left[\begin{array}{cc}{w}_{00}& w_{01}\\ w_{10}& w_{11}\end{array}\right]\left[\begin{array}{c}{D}_0\\ {\mathrm{<figure-callout\; id="1"\; label="D"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">D</figure-callout>}}_1\end{array}\right]$ Formula (9)

In formula (8) and the formula (9), for the PDSCH data that send, D _iThe upper data flow that sends of expression code stream i.

According to the method for precoding of formula (9) PDSCH data and the CRS signal of reception, the CRS in the precoding related blocks on two transmitting antennas that receive on the same reception antenna is carried out precoding merge the CRS that can construct, the CRS of structure is expressed as:

$\left[\begin{array}{c}{y}_0\\ {\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">y</figure-callout>}}_1\end{array}\right]=\left[\begin{array}{c}{h}_{00}\&CenterDot;w_{00}\&CenterDot;{\mathrm{<figure-callout\; id="0"\; label="CRS"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">CRS</figure-callout>}}_0+h_{01}\&CenterDot;w_{10}\&CenterDot;{\mathrm{<figure-callout\; id="0"\; label="CRS"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">CRS</figure-callout>}}_0+h_{00}\&CenterDot;w_{01}\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="CRS"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">CRS</figure-callout>}}_1+h_{01}\&CenterDot;w_{11}\&CenterDot;{\mathrm{CRS}}_1\\ h_{10}\&CenterDot;w_{00}\&CenterDot;{\mathrm{<figure-callout\; id="0"\; label="CRS"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">CRS</figure-callout>}}_0+h_{11}\&CenterDot;w_{10}\&CenterDot;{\mathrm{<figure-callout\; id="0"\; label="CRS"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">CRS</figure-callout>}}_0+h_{10}\&CenterDot;w_{01}\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="CRS"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">CRS</figure-callout>}}_1+h_{11}\&CenterDot;w_{11}\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="CRS"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">CRS</figure-callout>}}_1\end{array}\right]$ Formula (10)

$=\left[\begin{array}{c}{\mathrm{CRS}\_\mathrm{Rec}}_{00}\left(0\right)\&CenterDot;w_{00}+{\mathrm{CRS}\_\mathrm{Rec}}_{01}\left(0\right)\&CenterDot;w_{10}+\mathrm{CRS}\_{\mathrm{Rec}}_{00}\left(4\right)\&CenterDot;w_{01}+\mathrm{CRS}\_{\mathrm{Rec}}_{01}\left(4\right)\&CenterDot;w_{11}\\ {\mathrm{CRS}\_\mathrm{Rec}}_{10}\left(0\right)\&CenterDot;w_{00}+\mathrm{CRS}\_{\mathrm{Rec}}_{11}\left(0\right)\&CenterDot;w_{10}+\mathrm{CRS}\_{\mathrm{Rec}}_{10}\left(4\right)\&CenterDot;w_{01}+\mathrm{CRS}\_{\mathrm{Rec}}_{11}\left(4\right)\&CenterDot;w_{11}\end{array}\right]$

In the formula (10), for RI=2, CRS_Rec _Rt(i) cell reference signals that sends on the t root transmitting antenna that expression r root reception antenna receives, i represents the OFDM symbol logo.CRS ₀The CRS symbol that sends on the expression OFDM symbol 0, CRS ₁The CRS symbol that sends on the expression OFDM symbol 4.

Contrast (10) and formula (9) can find out that the CRS through precoding of structure has the precoding process identical with the PDSCH data.

(3) RI is 2, in order to reduce the complexity of computing, can suppose that pre-coding matrix is unit matrix, and the building method of cell reference signals is:

Namely $w=\left[\begin{array}{cc}1& 0\\ 0& 1\end{array}\right],$ According to formula (9) the identical CRS of frequency domain position on the different OFDM symbols on two transmitting antennas that receive on the same reception antenna is carried out precoding and merge the CRS that can construct, the CRS of structure is expressed as:

$\left[\begin{array}{c}{y}_0\\ {\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">y</figure-callout>}}_1\end{array}\right]=\left[\begin{array}{c}{h}_{00}\&CenterDot;{\mathrm{<figure-callout\; id="0"\; label="CRS"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">CRS</figure-callout>}}_0+h_{01}\&CenterDot;{\mathrm{CRS}}_1\\ h_{10}\&CenterDot;{\mathrm{<figure-callout\; id="0"\; label="CRS"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">CRS</figure-callout>}}_0+h_{11}\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="CRS"\; filenames="HDA0000096044900000022.png"\; state="\{\{state\}\}">CRS</figure-callout>}}_1\end{array}\right]$ Formula (11)

$=\left[\begin{array}{c}\mathrm{CRS}\_{\mathrm{Rec}}_{00}\left(0\right)+\mathrm{CRS}\_{\mathrm{Rec}}_{01}\left(4\right)\\ \mathrm{CRS}\_{\mathrm{Rec}}_{10}\left(0\right)+\mathrm{CRS}\_{\mathrm{Rec}}_{11}\left(4\right)\end{array}\right]$

The CRS through the unit matrix precoding for formula (11) structure is identical with the method for precoding of PDSCH data, but pre-coding matrix is different, but the CRS of this formula structure can embody the space characteristics of MIMO equally preferably, can effectively determine RI.

When the downlink reference signal that receives is CSI-RS, in order to reduce the complexity of computing, utilize a known pre-coding matrix to carry out the structure of CSI-RS signal, in the present embodiment, suppose that pre-coding matrix is unit matrix.

(1) RI is 1 o'clock, and the building method of CSI-RS signal is:

The building method of the CSI-RS signal during for RI=1 is identical with the building method of CRS.Suppose that pre-coding matrix is the unit matrix of T dimension, T is number of transmit antennas, then according to formula (7) CSI-RS on the identical OFDM symbol in all transmitting antenna mouth precoding related blocks that receive on the same reception antenna is carried out precoding and merge the CSI-RS that can construct, the CSI-RS of structure is expressed as:

y _r＝hr ₀(1th)·CSI ₀(1th)+h _r1(1th)·CSI ₁(1th)+...+h _rL(1th)·CSI _rL(1th)

Formula (12)

＝CSI_Rec _r0(1th)+CSI_Rec _r1(1th)+...+CSI_Rec _rT(1th)

In the formula, CSI_Rec _RtFirst that sends on the transmitting antenna t that (1th) expression reception antenna r receives contains the CSI signal on the CSI-RS symbol.

When (2) RI was L (L＞1), the building method that receives CSI-RS was:

Suppose that pre-coding matrix is the unit matrix of T dimension, T is number of transmit antennas, then according to formula (8) CSI-RS on two the OFDM symbols of all transmitting antenna mouths that receive on the same reception antenna is carried out precoding and merge the CSI-RS that can construct, the CSI-RS of structure is expressed as:

y _r＝h _r0·CSI ₀+h _r1·CSI ₁+...+h _rL·CSI _L

Formula (13)

＝CSI_Recr ₀+CSI_Rec _r1+...+CSI_Rec _rL

In the formula, CSI_Rec _RtUpper first and second CSI-RS signal sum that contains on the CSI-RS symbol that sends of the transmitting antenna t that expression reception antenna r receives.

S104, the residential quarter public reference signal of described structure is carried out MIMO (Multiple Input Multiple Output, multi-input multi-output system) input;

Wherein, the MIMO signal detection algorithm can adopt but be not limited to that ZF (Zero Force) detection algorithm, MMSE (Minimum MeanSquare Error) detection algorithm, QR decompose detection algorithm, MLD (Maxmimum Likelihood Detection) detection algorithm and based on disturbing the detection algorithm of eliminating.

Adopt in the present embodiment the MMSE algorithm to carry out the MIMO signal detection algorithm,

For each PMI under each RI, adopt the MIMO input receiver of linear MMSE algorithm can be represented by the formula:

$\mathrm{CCR}\hat{S}{[{\left(\mathrm{HW}\right)}^H\mathrm{HW}+{\mathrm{\&delta;}}^{2}I]}^{-1}{\left(\mathrm{HW}\right)}^{H}Y$ Formula (14)

In the formula, [(HW) ^HHW+ δ ²I] ^-1(HW) H is the matrix of L * R.Obtain through MIMO detection estimation

Dimension be L * 1, to different RI and PMI, all obtain one group of residential quarter public reference signal estimated value

S105, determine RI and PMI according to the MIMO signal detecting result.

In this step, determine that according to the MIMO signal detecting result RI and PMI are specially: determine RI and PMI according to the residential quarter public reference signal estimated value that described MIMO input obtains;

Or the residential quarter public reference signal estimated value that obtains according to described MIMO input and home cell public reference signal are determined RI and PMI jointly.

Algorithm can adopt but be not limited between maximum throughput, peak signal quality, minimum signal apart from principle.

Work as basis When signal is determined RI and PMI, under the different RI that step S104 is obtained and the PMI

Carry out the calculating of least cost function, be shown below:

Formula (15)

Work as basis

Signal and this locality

When signal is determined RI and PMI jointly, also comprise the information such as residential quarter ID that send according to the base station, obtain interior all sons of each OFDM in the subframe

Home cell public reference signal CCRS_Real on the carrier wave.

Under the different RI that step S104 is obtained and the PMI

The CCRS_Real that produces with this locality carries out the calculating of least cost function, is shown below:

Formula (16)

Through type (15) or formula (16) obtain RI corresponding to minimum f and PMI is final RI and the PMI that determines.

The invention also discloses the device of a kind of definite order indication and pre-coding matrix index, this device comprises: receiver module, acquisition module, constructing module, detection module and determination module, wherein,

Receiver module is used for receiving the residential quarter public reference signal from the base station;

Acquisition module, but for the RI that obtains value according to the number of transmit antennas of base station configuration (Rank Indicator, order indication) and PMI (Precoding Matrix Index, pre-coding matrix index);

Constructing module, but be used for re-constructing the residential quarter public reference signal according to RI, the PMI of described value and the residential quarter public reference signal of described reception;

Detection module is used for the residential quarter public reference signal of described structure is carried out MIMO (Multiple Input MultipleOutput, multi-input multi-output system) input;

Determination module is used for determining RI and PMI according to described MIMO signal detecting result.

Wherein, described residential quarter public reference signal comprises: CRS signal (Cell Reference Signals, cell reference signals) and CSI-RS signal (Channel-State Information Reference Signals, channel state information reference signals).

Wherein, but re-constructing the residential quarter public reference signal according to the residential quarter public reference signal of RI, the PMI of described value and described reception is specially: the residential quarter public reference signal of described reception is carried out precoding merge, structure is through the residential quarter public reference signal of precoding.

Described residential quarter public reference signal according to described RI, PMI and described reception re-constructs the residential quarter public reference signal and is specially: Wherein, CCRS_Rec _{R, t}The residential quarter public reference signal that the transmitting antenna t that expression reception antenna r receives sends; y _rThe residential quarter public reference signal of the reception antenna r that the expression structure obtains; w _tThe expression pre-coding matrix, its line number is that T, columns are RI.

The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims (12)

1. the method for a definite order indication and pre-coding matrix index is characterized in that the method comprises:

Reception is from the residential quarter public reference signal of base station;

But but obtain the order indication RI of value and the pre-coding matrix index PMI of value according to the number of transmit antennas of base station configuration;

But but re-construct the residential quarter public reference signal according to the PMI of the RI value of described value and the residential quarter public reference signal of reception;

Residential quarter public reference signal to described structure carries out multiple-input and multiple-output MIMO input;

Determine RI and PMI according to described MIMO signal detecting result.

2. method according to claim 1 is characterized in that, but described number of transmit antennas according to base station configuration chooses the RI of value and but the PMI of value is specially: when the number of transmit antennas of described base station configuration is T, the span of RI be 1,2 ..., T}; When T=RI=2, the span of PMI is { 1,2}; When the number of transmit antennas of described base station configuration is other situations that T and order are designated as RI, the span of PMI be 0,1 ..., 2 ^T-1}.

3. method according to claim 1 is characterized in that, described residential quarter public reference signal comprises: cell reference signals CRS or channel state information reference signals CSI-RS.

4. method according to claim 3, it is characterized in that, but re-constructing the residential quarter public reference signal according to the residential quarter public reference signal of RI, the PMI of described value and reception is specially: the residential quarter public reference signal of described reception is carried out precoding merge, obtain the residential quarter public reference signal through structure.

5. method according to claim 4 is characterized in that, described residential quarter public reference signal according to described RI, PMI and described reception re-constructs the residential quarter public reference signal and is specially:

Wherein, CCRS_Rec _{R, t}The residential quarter public reference signal that the transmitting antenna t that expression reception antenna r receives sends; y _rThe residential quarter public reference signal of the reception antenna r that the expression structure obtains; w _tThe expression pre-coding matrix, its line number is that T, columns are RI.

6. method according to claim 5 is characterized in that, when RI=1, adopts residential quarter public reference signal identical on each transmitting antenna to construct described residential quarter public reference signal, and the columns of pre-coding matrix is 1; When RI ≠ 1, adopt residential quarter public reference signals different on each transmitting antenna to construct described residential quarter public reference signal, the columns of pre-coding matrix is RI.

7. method according to claim 6 is characterized in that,

When described residential quarter public reference signal was the CRS signal, identical residential quarter public reference signal referred to the CRS signal on the immediate frequency domain position of identical orthogonal frequency division multiplex OFDM symbol on each transmitting antenna on described each transmitting antenna; Different residential quarter public reference signals refers to following any situation on described each transmitting antenna: the CRS signal on the different frequency domain positions of identical OFDM symbol on the CRS signal on the different frequency domain positions of different OFDM symbols or each transmitting antenna on the different locational CRS of OFDM symbol same frequency or each transmitting antenna on each transmitting antenna;

When described residential quarter public reference signal was the CSI-RS signal, identical residential quarter public reference signal referred to the CSI-RS signal on the identical OFDM symbol on each transmitting antenna on described each transmitting antenna; Different residential quarter public reference signals refers to the CSI-RS signal on the different OFDM symbols on each transmitting antenna on described each transmitting antenna.

8. method according to claim 1 is characterized in that, describedly determines that according to the MIMO signal detecting result RI and PMI are specially: determine RI and PMI according to the residential quarter public reference signal estimated value that described MIMO input obtains; Or the residential quarter public reference signal estimated value that obtains according to described MIMO input and home cell public reference signal are determined RI and PMI jointly.

9. the device of a definite order indication and pre-coding matrix index is characterized in that this device comprises:

Receiver module is used for receiving the residential quarter public reference signal from the base station;

Acquisition module, but but be used for obtaining the order indication RI of value and the pre-coding matrix index PMI of value according to the number of transmit antennas of base station configuration;

Constructing module, but but be used for re-constructing the residential quarter public reference signal according to the PMI of the RI value of described value and the residential quarter public reference signal of reception;

Detection module is used for the residential quarter public reference signal of described structure is carried out multiple-input and multiple-output MIMO input;

Determination module is used for determining RI and PMI according to described MIMO signal detecting result.

10. device according to claim 9 is characterized in that, described residential quarter public reference signal comprises: cell reference signals CRS or channel state information reference signals CSI-RS.

11. method according to claim 10, it is characterized in that, but re-constructing the residential quarter public reference signal according to the residential quarter public reference signal of RI, the PMI of described value and described reception is specially: the residential quarter public reference signal of described reception is carried out precoding merge, obtain the residential quarter public reference signal through structure.

12. device according to claim 11 is characterized in that, described residential quarter public reference signal according to described RI, PMI and described reception re-constructs the residential quarter public reference signal and is specially:

Wherein, CCRS_Rec _{R, t}The residential quarter public reference signal that the transmitting antenna t that expression reception antenna r receives sends; y _rThe residential quarter public reference signal of the reception antenna r that the expression structure obtains; w _tThe expression pre-coding matrix, its line number is that T, columns are RI.

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