CN101944979B - Multi-user multi-input multi-output feedback method and equipment - Google Patents

Abstract

The embodiment of the invention provides multi-user multi-input multi-output feedback method and equipment, which relates to the field of communication and can be suitable for a bilayer communication mode and further improve the multi-user multi-input multi-output transmission performance. The method comprises the following steps of: acquiring a precoding matrix index PMI of a maximum rank 1 of channel quality information CQI in a precoding matrix of all ranks 1, wherein the PMI is the precoding matrix index of the first precoding matrix; acquiring a second precoding matrix according to the PMI; acquiring CQI2 transmitted by the second precoding matrix according to the PMI; feeding the PMI and the CQI2 back to network equipment. The embodiment of the invention is used for multi-user multi-input multi-output transmission.

Description

Feedback method in multi-user's multiple-input, multiple-output and equipment

Technical field

The present invention relates to the communications field, relate in particular to feedback method and equipment in a kind of multi-user's multiple-input, multiple-output.

Background technology

Multiple-input, multiple-output (Multiple Input Multiple Output, MIMO) are to utilize many antennas to suppress channel fading.Multiuser MIMO (Multi User MIMO, MU-MIMO) improves power system capacity by multiplexing a plurality of users on same running time-frequency resource.In the prior art, the design of MIMO is mainly the performance of optimizing Single User MIMO (Single User MIMO, SU-MIMO), does not consider the optimization of multiuser MIMO is more.So, in prior art, only used a simple MU-MIMO mechanism, its key property is as follows:

1, use is based on the precoding of alone family code book;

2, each MU-MIMO user only uses the transmission of order 1 (rank1);

3, the calculating of CQI (Channel Quality Information, channel quality information) is based on that the hypothesis of Single User MIMO obtains.

In existing MU-MIMO, each user is to the base station feedback PMI of order 1 (Precoding MatrixIndex, precoding vector index), CQI separately.Dispatch according to PMI, the CQI of user feedback the base station, selects the user of pairing.At last, the transmission of MU-MIMO is carried out in the base station to the pairing user who chooses.

State in realization in the process of MU-MIMO, the inventor finds that in prior art, there are the following problems at least:

At present, in prior art, the feedback model of MU-MIMO is based on SU-MIMO, and the user of each MU-MIMO can only support the transmission of individual layer, and the feedback of CQI is also to feed back according to the mode of SU-MIMO.So that the performance of MU-MIMO is very low.

Summary of the invention

Embodiments of the invention provide feedback method and the equipment in a kind of multi-user's multiple-input, multiple-output, can adapt to the mode of two-layer transmission, and then can improve the transmission performance of multi-user's multiple-input, multiple-output.

For achieving the above object, embodiments of the invention adopt following technical scheme:

Feedback method in a kind of multi-user's multiple-input, multiple-output when using order 2 pre-coding matrixes to transmit, comprising:

In the pre-coding matrix of whole orders 1, obtain the pre-coding matrix index PMI of the order 1 of channel quality information CQI maximum, described PMI is the pre-coding matrix index of the first pre-coding matrix;

Obtain the second pre-coding matrix according to described PMI;

Obtain the CQI2 of the second pre-coding matrix transmission according to described PMI;

Described PMI, CQI2 are fed back to the network equipment.

A kind of feedback receiver method comprises:

Reception is from PMI, CQI1 and the CQI2 of subscriber equipment;

If CQI1＞CQI2, the pre-coding matrix of the order 1 of the corresponding CQI1 of definite described PMI; If CQI2＞CQI1, the pre-coding matrix of the order 1 of the corresponding described CQI2 of definite described PMI.

A kind of subscriber equipment when using order 2 pre-coding matrixes to transmit, comprising:

The PMI acquiring unit is used for the pre-coding matrix in whole orders 1, obtains the PMI of the order 1 of CQI maximum, and described PMI is the pre-coding matrix index of the first pre-coding matrix;

The second pre-coding matrix acquiring unit is used for obtaining the second pre-coding matrix according to described PMI;

The CQI2 acquiring unit is used for obtaining according to described PMI the CQI2 that the second pre-coding matrix transmits;

Feedback unit is used for described PMI, CQI2 are fed back to the network equipment.

A kind of network equipment comprises:

Receiving element is used for receiving PMI, CQI1 and CQI2 from subscriber equipment;

If judging unit is CQI1＞CQI2, the pre-coding matrix of the order 1 of the corresponding CQI1 of definite described PMI; If CQI2＞CQI1, the pre-coding matrix of the order 1 of the corresponding described CQI2 of definite described PMI.

Feedback method and equipment in multi-user's multiple-input, multiple-output that the embodiment of the present invention provides, when using order 2 pre-coding matrixes to transmit, in the pre-coding matrix of whole orders 1, obtain the pre-coding matrix index PMI of the order 1 of channel quality information CQI maximum, then obtain the second pre-coding matrix according to PMI, and obtain the CQI2 of the second pre-coding matrix transmission; Then PMI and CQI2 are fed back to the network equipment.Change the pattern of only supporting one deck transmission in prior art, can support two-layer transmission, concerning MU-MIMO, provide the report manner of a kind of CQI of rank adaptation flexibly, scheduling to MU-MIMO provides better flexibility, has improved the performance of MU-MIMO.

Description of drawings

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

The FB(flow block) of the feedback method in the MU-MIMO that Fig. 1 provides for the embodiment of the present invention 1;

The FB(flow block) of the feedback method in the MU-MIMO that Fig. 2 provides for the embodiment of the present invention 2;

The schematic diagram of the pre-coding matrix of the order 2 in the feedback method in the MU-MIMO that Fig. 3 provides for the embodiment of the present invention 2;

Use a code word to be mapped to two schematic diagrames on layer in feedback method in the MU-MIMO that Fig. 4 provides for the embodiment of the present invention 2;

Use two code words to be mapped to two schematic diagrames on layer in feedback method in the MU-MIMO that Fig. 5 provides for the embodiment of the present invention 2;

The FB(flow block) of the feedback method in the MU-MIMO that Fig. 6 provides for the embodiment of the present invention 3;

The schematic diagram of the pre-coding matrix of the order 2 in the feedback method in the MU-MIMO that Fig. 7 provides for the embodiment of the present invention 3;

Use a code word to be mapped to two schematic diagrames on layer in feedback method in the MU-MIMO that Fig. 8 provides for the embodiment of the present invention 3;

Use two code words to be mapped to two schematic diagrames on layer in feedback method in the MU-MIMO that Fig. 9 provides for the embodiment of the present invention 3;

The structured flowchart of the subscriber equipment that Figure 10 provides for the embodiment of the present invention 4;

The FB(flow block) of the feedback receiver method that Figure 11 provides for the embodiment of the present invention 5;

The structured flowchart of the network equipment that Figure 12 provides for the embodiment of the present invention 6.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.

Embodiment 1:

Feedback method in multi-user's multiple-input, multiple-output that the embodiment of the present invention provides, take in LTE-A (the senior evolution of LTE) as example explanation, the transmitting antenna of base station can have at most 8, can be configured to dual-polarized mode.Namely 4 transmitting antennas are one group, are configured to a kind of polarization mode; Another 4 antennas are another group, are configured to another kind of polarization mode.In LTE-A, the dual polarization configuration mode of 8 transmitting antennas in base station for each user, provides the possibility of supporting two-layer transmission, and namely each polarization mode is supported one deck.

When using order 2 pre-coding matrixes to transmit, as shown in Figure 1, the method step comprises:

S101, in the pre-coding matrix of whole orders 1, obtain the pre-coding matrix index PMI of the order 1 of channel quality information CQI maximum, this PMI is the pre-coding matrix index of the first pre-coding matrix;

S102, obtain the second pre-coding matrix according to PMI;

S103, obtain the CQI2 of the second pre-coding matrix transmission according to PMI;

S104, PMI, CQI2 are fed back to the network equipment.

Concrete, in step S101, obtaining maximum CQI method can be as follows:

Suppose that there is M root transmitting antenna the base station, UE has N root reception antenna, sends K data flow, and the model that receives is (falt fading channel):

$y=\mathrm{HVs}+n=\tilde{H}s+n---\left(1\right)$

In (1), y is the reception vector of N * 1, and H is the channel matrix of N * M, and V is the precoding matrix of transmitting terminal, is the vector of M * 1, the symbolic vector of s for sending, and n is the noise vector of N * 1, when noise was zero-mean, n was that variance is σ ²White Gaussian noise vector.In (1), $\tilde{H}=\mathrm{HV}$ Be equivalent channel.

Code book { the C that it is B that the precoding vector of supposing order 1 is taken from a number of sets ₁, C ₂..., C _B, when the precoding matrix is C _iThe time, the reception model is:

y＝HC _is+n (2)

Then UE is by H, C _i, σ ²Calculate the weighting matrix G of receiving terminal _i(1 * N), obtain:

z＝G _iy＝G _iHC _is+G _in＝T _is+G _in (3)

In (3), T _i=G _iHC _iAt receiving terminal, when using C _iWhen carrying out the precoding of order 1, signal to noise ratio snr _iComputing formula be:

${\mathrm{SNR}}_i=\frac{{\left|\right|T_i\left|\right|}^2}{{\left|\right|G_i\left|\right|}^2}\frac{E\left(\right|s^2\left|\right)}{{\mathrm{\σ}}^2}=\frac{{\left|\right|T_i\left|\right|}^2}{{\left|\right|G_i\left|\right|}^2}\frac{P}{{\mathrm{\σ}}^2}---\left(4\right)$

In (4), the average of E (x) expression x, P=E (| s ²|) be signal power.

Afterwards, according to SNR _i, obtain CQI by tabling look-up _i

At last, in B CQI, select maximum CQI, and obtain corresponding order 1 pre-coding matrix C.

Feedback method in multi-user's multiple-input, multiple-output that the embodiment of the present invention provides, when using order 2 pre-coding matrixes to transmit, in the pre-coding matrix of whole orders 1, obtain the pre-coding matrix index PMI of the order 1 of channel quality information CQI maximum, then obtain the second pre-coding matrix according to PMI, and obtain the CQI2 of the second pre-coding matrix transmission; Then PMI and CQI2 are fed back to the network equipment.Change the pattern of only supporting one deck transmission in the prior art, concerning MU-MIMO, provide the report manner of a kind of CQI of rank adaptation flexibly, provide better flexibility to the scheduling of MU-MIMO, improved the performance of MU-MIMO.

Embodiment 2:

Feedback method in multi-user's multiple-input, multiple-output that the embodiment of the present invention provides, suppose code word mapping mode and the corresponding CQI report manner of a two-layer transmission of User support, when using a code word or two code words to be mapped on two layers, and when the pre-coding matrix that uses order 2 transmits, as shown in Figure 2, the method step comprises:

S201, in the pre-coding matrix of whole orders 1, obtain the pre-coding matrix index PMI of the order 1 of CQI maximum, this PMI is the pre-coding matrix index of the first pre-coding matrix.At this, the method for obtaining the CQI maximum can be with reference to the acquisition methods in embodiment 1.

S202, obtain the CQI1 of the first pre-coding matrix transmission of corresponding order 1 according to this PMI.

S203, obtain the CQI2 of the second pre-coding matrix transmission of order 2 according to this PMI.Wherein, the first pre-coding matrix of the nested above-mentioned order 1 of the second pre-coding matrix of order 2.The codebook matrix that is precoding has nested property, and the pre-coding matrix of low-rank can be obtained by the pre-coding matrix of high order.For example, shown in Figure 3 is the pre-coding matrix of an order 2, comprises two column vectors.The present embodiment is assumed to be first the first pre-coding matrix of classifying order 1 as.

S204, obtain the CQI2 of the second pre-coding matrix transmission of order 2 according to this PMI, as shown in Figure 3.

S205, PMI, CQI1, CQI2 are fed back to the network equipment.

Concrete, when hypothesis used a code word to be mapped on two layers, as shown in Figure 4, use one deck that CQI1 represents carried out the CQI that data send; CQI2 represents is to use the two-layer CQI of data when sending that carry out.At this moment, can only report PMI and CQI2.

When hypothesis used two code words to be mapped on two layers, as shown in Figure 5, use one deck that CQI1 represents carried out the CQI of the code word 1 of data transmission; CQI2 represents is to use the two-layer CQI that carries out the code word 2 of data when sending.

Feedback method in multi-user's multiple-input, multiple-output that the embodiment of the present invention provides, when using order 2 pre-coding matrixes to transmit, in the pre-coding matrix of whole orders 1, obtain the pre-coding matrix index PMI of the order 1 of channel quality information CQI maximum, obtain the CQI1 of the first pre-coding matrix transmission of corresponding order 1 according to this PMI, then obtain the second pre-coding matrix of order 2 according to PMI, and obtain the CQI2 of the second pre-coding matrix transmission of order 2; Then PMI, CQI1, CQI2 are fed back to the network equipment.Changed the pattern of only supporting one deck transmission in the prior art, can support two-layer transmission, concerning MU-MIMO, provide the report manner of a kind of CQI of rank adaptation flexibly, scheduling to MU-MIMO provides better flexibility, has improved the performance of MU-MIMO.

Embodiment 3:

Feedback method in multi-user's multiple-input, multiple-output that the embodiment of the present invention provides, suppose code word mapping mode and the corresponding CQI report manner of a two-layer transmission of User support, when using a code word or two code words to be mapped on two layers, and when using order 2 pre-coding matrixes to transmit, as shown in Figure 6, the method step comprises:

S601, in the pre-coding matrix of whole orders 1, obtain the pre-coding matrix index PMI of the order 1 of CQI maximum, this PMI is the pre-coding matrix index of the first pre-coding matrix.Concrete, as shown in Figure 7, be the pre-coding matrix of an order 2, comprise two column vectors.Suppose that the pre-encoding codeword number that the codebook matrix of precoding comprises is K, the transmitting antenna number is Nt.Namely concerning order 2 pre-coding matrixes, a total K pre-coding matrix, each pre-coding matrix are the matrixes of Nt * 2 dimensions.Each row of each matrix are vectors of Nt * 1.The vector of such one total 2K Nt * 1.In the vector of this 2K Nt * 1, select the PMI of order 1 according to the criterion of the CQI maximum that makes order 1, in the present embodiment, suppose that PMI is the pre-coding matrix index of the first row of these order 2 pre-coding matrixes, namely the first pre-coding matrix of order 1 is the first row of order 2 pre-coding matrixes.At this, the method for obtaining the CQI maximum can be with reference to the acquisition methods in embodiment 1.

S602, obtain the CQI1 of the first pre-coding matrix transmission of corresponding order 1 according to this PMI.

S603, obtain the second pre-coding matrix of order 1 according to this PMI, wherein, the second pre-coding matrix of order 1 and the first pre-coding matrix of order 1 are respectively two row of the pre-coding matrix of described order 2.As shown in Figure 7, because the first precoding square of hypothesis order 1 in step S601 is the first row of the pre-coding matrix of order 2, in this step S603, the second pre-coding matrix of order 1 is the secondary series of the pre-coding matrix of order 2 so.Need to prove, the first row that is the pre-coding matrix of order 2 at the first pre-coding matrix of this indication order 1 just illustrates, and actually is not restricted to this.

S604, obtain the CQI2 of the second pre-coding matrix transmission of order 1 according to this PMI, as shown in Figure 7, the second pre-coding matrix of the present embodiment hypothesis order 1 is the secondary series of the pre-coding matrix of order 2.

S605, PMI, CQI1, CQI2 are fed back to the network equipment.

Further, after the user feeds back to the network equipment with above-mentioned PMI, CQI1, CQI2, the network equipment (in this enforcement for base station) is if what determine that this user uses is order 1 transmission, and so, the size that can compare CQI1 and CQI2 is determined the pre-coding matrix of the order 1 that this user expects.If i.e. CQI1＞CQI2 determines the pre-coding matrix of the corresponding order 1 of PMI, i.e. the first row of order 2 matrixes; If CQI2＞CQI1, the pre-coding matrix of corresponding another order 1 of definite PMI, the i.e. secondary series of order 2 matrixes.

Concrete, when supposing to use a code word to be mapped on two layers, as shown in Figure 8, what CQI1 represented is only to use layer 1 to carry out the CQI that data send; CQI2 represents is only to use layer 2 to carry out the CQI of data when sending.

When supposing to use two code words to be mapped on two layers, as shown in Figure 9, what CQI1 represented is only to use layer 1 to carry out the CQI of the code word 1 of data transmission; That CQI2 represents is the CQI of the code word 2 when only using layer 2 to carry out the data transmission.

Feedback method in multi-user's multiple-input, multiple-output that the embodiment of the present invention provides, when using order 2 pre-coding matrixes to transmit, in the pre-coding matrix of whole orders 1, obtain the pre-coding matrix index PMI of the order 1 of channel quality information CQI maximum, obtain the CQI1 of the first pre-coding matrix transmission of corresponding order 1 according to this PMI, then obtain the second pre-coding matrix of order 1 according to PMI, and obtain the CQI2 of the second pre-coding matrix transmission of order 1; Then PMI, CQI1, CQI2 are fed back to the network equipment.Changed the pattern of only supporting one deck transmission in the prior art, can support two-layer transmission, concerning MU-MIMO, provide the report manner of a kind of CQI of rank adaptation flexibly, scheduling to MU-MIMO provides better flexibility, has improved the performance of MU-MIMO.

In addition, this enforcement has also improved the performance of order 1 transmission because the number that is equivalent to the precoding vector that uses order 1 doubles.

Embodiment 4:

The subscriber equipment that the embodiment of the present invention provides, suppose code word mapping mode and the corresponding CQI report manner of a two-layer transmission of User support, when using a code word or two code words to be mapped on two layers, and use the pre-coding matrix of order 2, in the present embodiment, the pre-coding matrix of this order 2 comprises two column vectors, when transmitting, as shown in figure 10, this equipment comprises:

PMI acquiring unit 1001 is used for the pre-coding matrix in whole orders 1, obtains the PMI of the order 1 of CQI maximum, and this PMI is the pre-coding matrix index of the first pre-coding matrix;

For obtaining maximum CQI, this PMI acquiring unit 1001 may further include snr computation module, CQI _iAcquisition module and selection module.

Concrete, the snr computation module is used for calculating received signal to noise ratio SNR _i, calculate signal to noise ratio snr in its concrete steps and above-described embodiment 1 _iMethod identical, do not repeat them here.

CQI _iAcquisition module is used for according to signal to noise ratio snr _i, obtain CQI by tabling look-up _i

Select module, from the CQI that obtains _iIn select maximum CQI.

The second pre-coding matrix acquiring unit 1002 is used for obtaining the second pre-coding matrix according to this PMI;

CQI2 acquiring unit 1003 is used for obtaining according to this PMI the CQI2 that the second pre-coding matrix transmits;

Feedback unit 1004 is used for PMI, CQI2 are fed back to the network equipment.

Further, this subscriber equipment also comprises:

CQI1 acquiring unit 1005 is for the CQI1 of the first pre-coding matrix transmission that obtains corresponding order 1 according to this PMI.

Correspondingly, described feedback unit 1004 just feeds back to the network equipment with described PMI, CQI1, CQI2.

When using a code word or two code words to be mapped on two layers, described the second pre-coding matrix acquiring unit 1002, according to the second pre-coding matrix of PMI acquisition order 2, wherein, the first pre-coding matrix of the second nested order 1 of pre-coding matrix of order 2.

Accordingly, described CQI2 acquiring unit 1003 just obtains the CQI2 of the second pre-coding matrix transmission of order 2 according to PMI.

Like this, when using order 2 pre-coding matrixes to transmit, in the pre-coding matrix of whole orders 1, the PMI acquiring unit obtains the pre-coding matrix index PMI of the order 1 of channel quality information CQI maximum, the CQI1 acquiring unit obtains the CQI1 of the first pre-coding matrix transmission of corresponding order 1 according to this PMI, then the second pre-coding matrix acquiring unit obtains the second pre-coding matrix of order 2 according to PMI, and the CQI2 acquiring unit obtains the CQI2 of the second pre-coding matrix transmission of order 2; Then feedback unit feeds back to the network equipment with PMI, CQI1, CQI2.Changed the pattern of only supporting one deck transmission in the prior art, can support two-layer transmission, concerning MU-MIMO, provide the report manner of a kind of CQI of rank adaptation flexibly, scheduling to MU-MIMO provides better flexibility, has improved the performance of MU-MIMO.

When using a code word or two code words to be mapped on two layers, described the second pre-coding matrix acquiring unit 1002, obtain the second pre-coding matrix of order 1 according to PMI, wherein, the second pre-coding matrix of order 1 and the first pre-coding matrix of order 1 are respectively two row of the pre-coding matrix of order 2.

Accordingly, described CQI2 acquiring unit 1003 just obtains the CQI2 of the second pre-coding matrix transmission of order 1 according to PMI.

Like this, when using order 2 pre-coding matrixes to transmit, in the pre-coding matrix of whole orders 1, the PMI acquiring unit obtains the pre-coding matrix index PMI of the order 1 of channel quality information CQI maximum, the CQI1 acquiring unit obtains the CQI1 of the first pre-coding matrix transmission of corresponding order 1 according to this PMI, then the second pre-coding matrix acquiring unit obtains the second pre-coding matrix of order 1 according to PMI, and the CQI2 acquiring unit obtains the CQI2 of the second pre-coding matrix transmission of order 1; Then feedback unit feeds back to the network equipment with PMI, CQI1, CQI2.Changed the pattern of only supporting one deck transmission in the prior art, can support two-layer transmission, concerning MU-MIMO, provide the report manner of a kind of CQI of rank adaptation flexibly, scheduling to MU-MIMO provides better flexibility, has improved the performance of MU-MIMO.

In addition, this enforcement has also improved the performance of order 1 transmission because the number that is equivalent to the precoding vector that uses order 1 doubles.

Embodiment 5:

For embodiment 3, the embodiment of the present invention provides a kind of feedback receiver method, and as shown in figure 11, the method comprises:

S1101, receive PMI, CQI1 and CQI2 from subscriber equipment;

If S1102 is CQI1＞CQI2, determine the pre-coding matrix of the order 1 of the corresponding CQI1 of PMI, i.e. the first row of the pre-coding matrix of order 2 in embodiment 3;

If CQI2＞CQI1, the pre-coding matrix of the order 1 of the corresponding described CQI2 of definite PMI, the i.e. secondary series of the pre-coding matrix of order 2 in embodiment 3.

Like this, in the pre-coding matrix of order 2, the network equipment just can find the pre-coding matrix of the order 1 of CQI maximum, thereby carries out order 1 precoding, improves the quality of individual layer transmission.

Embodiment 6:

For embodiment 5, the embodiment of the present invention provides a kind of network equipment, and as shown in figure 12, this equipment comprises:

Receiving element 1201 is used for receiving PMI, CQI1 and CQI2 from subscriber equipment;

If judging unit 1202 is CQI1＞CQI2, the pre-coding matrix of the order 1 of the corresponding CQI1 of definite described PMI; If CQI2＞CQI1, the pre-coding matrix of the order 1 of the corresponding described CQI2 of definite described PMI.

Like this, in the pre-coding matrix of order 2, the network equipment just can find the pre-coding matrix of the order 1 of CQI maximum, thereby carries out order 1 precoding, improves the quality of individual layer transmission.

The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by described protection range with claim.

Claims (14)

1. the feedback method in multi-user's multiple-input, multiple-output, is characterized in that, when using order 2 pre-coding matrixes to transmit, comprising:

In the pre-coding matrix of whole orders 1, obtain the pre-coding matrix index PMI of the order 1 of channel quality information CQI maximum, described PMI is the pre-coding matrix index of the first pre-coding matrix;

Obtain the second pre-coding matrix according to described PMI;

Obtain the CQI2 of the second pre-coding matrix transmission according to described PMI;

Described PMI, CQI2 are fed back to the network equipment.

2. method according to claim 1, is characterized in that, described method also comprises:

Obtain the CQI1 of the first pre-coding matrix transmission of corresponding order 1 according to described PMI;

Described CQI1 is also fed back to the network equipment.

3. method according to claim 1, is characterized in that, and is described according to described PMI acquisition the second pre-coding matrix when using a code word or two code words to be mapped on two layers, comprising:

Obtain the second pre-coding matrix of order 2 according to described PMI, wherein, the first pre-coding matrix of the nested described order 1 of the second pre-coding matrix of described order 2.

4. method according to claim 3, is characterized in that, the described CQI 2 that obtains the second pre-coding matrix transmission according to described PMI comprises:

Obtain the CQI2 of the second pre-coding matrix transmission of order 2 according to described PMI.

5. method according to claim 1, is characterized in that, and is described according to described PMI acquisition the second pre-coding matrix when using a code word or two code words to be mapped on two layers, comprising:

Obtain the second pre-coding matrix of order 1 according to described PMI, wherein, the second pre-coding matrix of described order 1 and the first pre-coding matrix of described order 1 are respectively two row of the pre-coding matrix of described order 2.

6. method according to claim 5, is characterized in that, the described CQI2 that obtains the second pre-coding matrix transmission according to described PMI comprises:

Obtain the CQI2 of the second pre-coding matrix transmission of order 1 according to described PMI.

7. a feedback receiver method, is characterized in that, comprising:

Reception is from pre-coding matrix index PMI, channel quality information CQI1 and the channel quality information CQI2 of subscriber equipment;

If CQI1＞CQI2, the pre-coding matrix of the order 1 of the corresponding CQI1 of definite described PMI;

If CQI2＞CQI1, the pre-coding matrix of the order 1 of the corresponding described CQI2 of definite described PMI;

Wherein, described PMI, CQI1 and CQI2 are described subscriber equipment when using order 2 pre-coding matrixes to transmit, and in the pre-coding matrix of whole orders 1, obtain the PMI of the order 1 of CQI maximum, and described PMI is the pre-coding matrix index of the first pre-coding matrix; Obtain the second pre-coding matrix according to described PMI; Obtain the CQI2 of the second pre-coding matrix transmission according to described PMI; Obtain the CQI1 of the first pre-coding matrix transmission of corresponding order 1 according to described PMI.

8. a subscriber equipment, is characterized in that, when using order 2 pre-coding matrixes to transmit, comprising:

The PMI acquiring unit is used for the pre-coding matrix in whole orders 1, obtains the pre-coding matrix index PMI of the order 1 of channel quality information CQI maximum, and described PMI is the pre-coding matrix index of the first pre-coding matrix;

The second pre-coding matrix acquiring unit is used for obtaining the second pre-coding matrix according to described PMI;

The CQI2 acquiring unit is used for obtaining according to described PMI the CQI2 that the second pre-coding matrix transmits;

Feedback unit is used for described PMI, CQI2 are fed back to the network equipment.

9. subscriber equipment according to claim 8, is characterized in that, described subscriber equipment also comprises:

The CQI1 acquiring unit is for the CQI1 of the first pre-coding matrix transmission that obtains corresponding order 1 according to described PMI;

Described feedback unit also is used for described CQI1 is also fed back to the network equipment.

10. subscriber equipment according to claim 8, is characterized in that, when using a code word or two code words to be mapped on two layers,

Described the second pre-coding matrix acquiring unit, concrete the second pre-coding matrix that is used for obtaining according to described PMI order 2, wherein, the first pre-coding matrix of the nested described order 1 of the second pre-coding matrix of described order 2.

11. subscriber equipment according to claim 10 is characterized in that,

Described CQI2 acquiring unit, the concrete CQI2 that is used for obtaining according to described PMI the second pre-coding matrix transmission of order 2.

12. subscriber equipment according to claim 8 is characterized in that, when using a code word or two code words to be mapped on two layers,

Described the second pre-coding matrix acquiring unit, concrete for described the second pre-coding matrix that obtains order 1 according to described PMI, wherein, the first pre-coding matrix of the second pre-coding matrix of described order 1 and described order 1 is respectively two row of the pre-coding matrix of described order 2.

13. subscriber equipment according to claim 12 is characterized in that,

Described CQI2 acquiring unit, the concrete CQI2 that is used for obtaining according to described PMI the second pre-coding matrix transmission of order 1.

14. a network equipment is characterized in that, comprising:

Receiving element is used for receiving pre-coding matrix index PMI, channel quality information CQI1 and channel quality information CQI2 from subscriber equipment;

If judging unit is CQI1＞CQI2, the pre-coding matrix of the order 1 of the corresponding CQI1 of definite described PMI; If CQI2＞CQI1, the pre-coding matrix of the order 1 of the corresponding described CQI2 of definite described PMI;

Wherein, described PMI, CQI1 and CQI2 are described subscriber equipment when using order 2 pre-coding matrixes to transmit, and in the pre-coding matrix of whole orders 1, obtain the PMI of the order 1 of CQI maximum, and described PMI is the pre-coding matrix index of the first pre-coding matrix; Obtain the second pre-coding matrix according to described PMI; Obtain the CQI2 of the second pre-coding matrix transmission according to described PMI; Obtain the CQI1 of the first pre-coding matrix transmission of corresponding order 1 according to described PMI.

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