CN102201849B - Channel information acquisition and feedback methods, systems and devices - Google Patents

Abstract

The invention discloses a channel information acquisition method, a channel information acquisition system, a channel information acquisition device, a channel information feedback method, a channel information feedback system and a channel information feedback device, which relate to a communication technology. Under the condition of not performing antenna correction among a plurality of transmission points, a receiver feeds a small amount of channel information back, and simultaneously, joint channels of the plurality of transmission points are determined by utilizing channel reciprocity and the received channel information. A reciprocal relationship between downlink channels and uplink channels of each transmission point are determined according to the fed back information, and the downlink channels are determined according to the reciprocal relationship, thereby improving the accuracy of the downlink channels obtained by a transmitter.

Description

A kind of channel information acquisition and feedback method, system and device

Technical field

The present invention relates to the communication technology, relate in particular to a kind of channel information acquisition and feedback method, system and device.

Background technology

LTE-A(Long Term Evolution Advanced, follow-up Long Term Evolution) adopt identical networking, when increasing substantially the availability of frequency spectrum, also can cause the subscriber signal decline of cell edge serious, be subject to the higher interference from other communities simultaneously, if signal fadeout and interference problem are not processed, will have a strong impact on the experience of edge customer.Multipoint cooperative (CoMP, Coordinated Multi-Point Transmission/Reception, coordinate multipoint sending/receiving) technology is by introducing information interaction and the joint transmission between many communities, not only can improve signal quality and also can reduce presence of intercell interference, thereby can increase substantially the data transmission performance of Cell Edge User.

In order to improve, the covering of hot zones is saved to network cost simultaneously, many operators and equipment vendor wish to introduce distributed RRH(Remote Radio Head, and far-end is without the end of a thread).It is inner that RRH is dispersed in Yi Ge community, and a RRH can have oneself independently cell identifier (Identification, ID), also can be subordinated to same community with other RRH or macro base station.Because the distance apart from terminal use is less, can provide the communication service that quality is higher to terminal.Because the data of all RRH in Yi Ge community are all focused on by baseband processing unit, this just give efficient collaboration, both between RRH brought may, therefore distributed RRH is also the important scenes of CoMP technology application.

No matter each community in Shi Duo community, an or RRH in distributed RRH scene, can regard a transfer point in CoMP transmission as.Realize the CoMP transmission of Combined Treatment, all need to know that each cooperation transmission puts user's combined channel.

At TDD(Time Division Duplex, time division duplex) in system, can pass through SRS(Sounding Reference Signal, detection reference signal) measure up channel, and utilize channel reciprocity, obtain down channel.So not only save the feedback overhead to down channel, also avoided quantification and the feedback error in feedback procedure.

Concrete, desirable calibration between each transfer point internal antenna of TDD system, and the situation Xia， base station end of ideal antenna calibration between each transfer point can utilize channel reciprocity and measure descending channel information by uplink SRS.

As shown in Figure 1, realize the CoMP transmission of transfer point 1 and transfer point 2, need to know that transfer point 1 and transfer point 2 are to user's combined channel $\left[\begin{array}{cc}{H}_1^{\mathrm{DL}}& H_2^{\mathrm{DL}}\end{array}\right].$ If calibrated between each transfer point internal antenna, the transfer point 1 obtaining by out-hole run pilot tone and the up channel between user

with down channel between only exist a mould value to be approximately 1 plural difference, same, the transfer point 2 obtaining by out-hole run pilot tone and the up channel between user

with down channel

between be also only to exist a mould value to be approximately 1 plural difference, that is,

if also realize ideal antenna calibration, α between each transfer point ₁=α ₂=α, the resulting combined channel of out-hole run $\left[\begin{array}{cc}{H}_1^{\mathrm{UL}}& H_2^{\mathrm{UL}}\end{array}\right]$ With descending combined channel $\left[\begin{array}{cc}{H}_1^{\mathrm{DL}}& H_2^{\mathrm{DL}}\end{array}\right]$ Only there is a plural difference, that is: $\left[\begin{array}{cc}{H}_1^{\mathrm{UL}}& H_2^{\mathrm{UL}}\end{array}\right]=\mathrm{\α}\left[\begin{array}{cc}{H}_1^{\mathrm{DL}}& H_2^{\mathrm{DL}}\end{array}\right].$ Now, channel reciprocity is set up, even if α is unknown, also can obtain descending combined channel by out-hole run.

But if the antenna of radiating circuit and receiving circuit is not calibrated, not mating of transmission circuit can cause up-downgoing channel reciprocity strictly not set up.Thereby it is inaccurate to cause down channel to be estimated.

And in real system, the calibration between each transfer point internal antenna can realize by methods such as self calibrations, the antenna calibration between each transfer point needs Signalling exchange and/or standardization, and the method that there is no is at present supported the antenna calibration between transfer point, so α ₁≠ α ₂.If directly utilize the combined channel of out-hole run $\left[\begin{array}{cc}{H}_1^{\mathrm{UL}}& H_2^{\mathrm{UL}}\end{array}\right]$ Estimate descending combined channel $\left[\begin{array}{cc}{H}_1^{\mathrm{DL}}& H_2^{\mathrm{DL}}\end{array}\right],$ Due to $\left[\begin{array}{cc}{H}_1^{\mathrm{UL}}& H_2^{\mathrm{UL}}\end{array}\right]=\left[\begin{array}{cc}{\mathrm{\α}}_1{H}_1^{\mathrm{DL}}& {\mathrm{\α}}_2{H}_2^{\mathrm{DL}}\end{array}\right],$ Channel heterogeneite is false, if do not consider the difference between each α, can cause the misjudgment of channel information, thereby affects CoMP performance.

Summary of the invention

The embodiment of the present invention provides a kind of channel information acquisition and feedback method, system and device, to improve the accuracy of the down channel that transmitting terminal obtains.

, comprising:

Obtain receiving terminal to the channel parameter of the up channel of each transfer point, determine that receiving terminal arrives the up channel matrix of each transfer point;

According to the down channel of the up channel matrix of each transfer point and definite each transfer point and the reciprocal relation between up channel, determine the associating down channel matrix of each transfer point, the down channel of described each transfer point and the reciprocal relation between up channel are determined according to the descending channel information of the up channel parameter of each transfer point and receiving terminal feedback;

The descending channel information of described receiving terminal feedback, is specially:

Each transfer point of correspondence of receiving terminal feedback, at least one channel ratio of determining or at least one definite channel ratio and at least one element in should the down channel matrix of transfer point, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point; Or

The correspondence of receiving terminal feedback is except each transfer point of setting transfer point, at least one channel ratio of determining, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point.

, comprising:

Determine down channel matrix or the associating down channel matrix of each transfer point;

According to the down channel matrix of described each transfer point or associating down channel matrix, feedback of down channel information is specially described in feedback of down channel information:

Corresponding each transfer point of feedback, at least one channel ratio of determining or at least one definite channel ratio and at least one element in should the down channel matrix of transfer point, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point; Or

Corresponding each transfer point except setting transfer point of feedback, at least one channel ratio of determining, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point.

A device, comprising:

Obtain unit, for obtaining receiving terminal to the channel parameter of the up channel of each transfer point, determine that receiving terminal arrives the up channel matrix of each transfer point;

Channel information acquisition unit, for according to the down channel of the up channel matrix of each transfer point and definite each transfer point and the reciprocal relation between up channel, determine the associating down channel matrix of each transfer point, the down channel of described each transfer point and the reciprocal relation between up channel are determined according to the descending channel information of the up channel parameter of each transfer point and receiving terminal feedback;

The descending channel information of described receiving terminal feedback, be specially: each transfer point of correspondence of receiving terminal feedback, at least one channel ratio of determining or at least one definite channel ratio and at least one element in should the down channel matrix of transfer point, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point; Or the correspondence of receiving terminal feedback is except each transfer point of setting transfer point, at least one channel ratio of determining, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point.

A device, comprising:

Determining unit, for determining down channel matrix or the associating down channel matrix of each transfer point;

Feedback unit, for according to the down channel matrix of described each transfer point or associating down channel matrix, feedback of down channel information;

Described feedback of down channel information is specially:

Corresponding each transfer point of feedback, at least one channel ratio of determining or at least one definite channel ratio and at least one element in should the down channel matrix of transfer point, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point; Or

Corresponding each transfer point except setting transfer point of feedback, at least one channel ratio of determining, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point.

The invention provides a kind of channel information acquisition and feedback method, system and device, in the situation that not carrying out antenna calibration between a plurality of transfer points, by receiving terminal, feed back a small amount of channel information, utilize channel reciprocity and received channel information to determine the combined channel of a plurality of transfer points simultaneously, owing to having determined the down channel of each transfer point and the reciprocal relation between up channel according to institute's feedack, according to this reciprocal relation, determine down channel again, thereby improved the accuracy of the down channel that transmitting terminal obtains.

Accompanying drawing explanation

Fig. 1 is the many transfer points channel schematic diagram in the embodiment of the present invention;

The channel information acquisition method flow chart that Fig. 2 provides for the embodiment of the present invention;

The channel information feedback method flow chart that Fig. 3 provides for the embodiment of the present invention;

The channel information acquisition system configuration schematic diagram that Fig. 4 provides for the embodiment of the present invention;

The channel information acquisition apparatus structure schematic diagram that Fig. 5 provides for the embodiment of the present invention;

The feedback of channel information apparatus structure schematic diagram that Fig. 6 provides for the embodiment of the present invention.

Embodiment

The invention provides a kind of channel information acquisition and feedback method, system and device, in the situation that not carrying out antenna calibration between a plurality of transfer points, by receiving terminal, feed back a small amount of channel information, utilize channel reciprocity and received channel information to determine the combined channel of a plurality of transfer points simultaneously, owing to having determined the down channel of each transfer point and the reciprocal relation between up channel according to institute's feedack, according to this reciprocal relation, determine down channel again, thereby improved the accuracy of the down channel that transmitting terminal obtains.

As shown in Figure 2, the channel information acquisition method that the embodiment of the present invention provides comprises:

Step S201, acquisition receiving terminal arrive the channel parameter of the up channel of each transfer point, determine that receiving terminal arrives the up channel matrix of each transfer point;

Step S202, according to the down channel of the up channel matrix of each transfer point and definite each transfer point and the reciprocal relation between up channel, determine the associating down channel matrix of each transfer point, wherein, the down channel of each transfer point and the reciprocal relation between up channel are determined according to the descending channel information of the up channel parameter of each transfer point and receiving terminal feedback.

Owing to only needing receiving terminal feedback, can determine the down channel of each transfer point and a small amount of descending channel information of the reciprocal relation between up channel, so can not bring excessive burden to system, simultaneously, due to the reciprocal relation having known between down channel and up channel, the associating down channel matrix that can determine each transfer point according to the up channel matrix of each transfer point and reciprocal relation, so improved the accuracy of the down channel that transmitting terminal obtains.

In the situation that the reciprocal relation between down channel and up channel knows, due to reciprocal relation between down channel and up channel change less, so carry out that device that channel obtains can determine each transfer point according to the up channel matrix of the reciprocal relation between the down channel having known and up channel and each transfer point combine down channel matrix.

Conventionally, the device that carries out channel information acquisition can be one of transfer point, and predefined central transmission point, can be also eNB(e-NodeB, base station) other node such as, as long as can more conveniently carry out data interaction between this node and each transfer point.

Carry out the device of channel information acquisition, be that transmitting terminal is before determining the down channel and the reciprocal relation between up channel of each transfer point, need to first determine descending channel information and the up channel matrix of each transfer point or the associating up channel matrix of each transfer point of receiving terminal feedback, and then according to up channel matrix and the reciprocal relation of each transfer point, determine the associating down channel matrix of each transfer point.

Concrete, when channel information acquisition device is predefined central transmission point, predefined central transmission point need to be determined descending channel information and the up channel matrix of each transfer point or the associating up channel matrix of each transfer point of receiving terminal feedback.Wherein, the associating up channel matrix of the up channel matrix of each transfer point or each transfer point can send to this predefined central transmission point by up channel matrix separately by other each transfer point, and the descending channel information of receiving terminal feedback can directly feed back to all descending channel informations this predefined central transmission point by receiving terminal, also can the descending channel information of corresponding each transfer point be fed back to respectively to this predefined central transmission point and other transfer point by receiving terminal, other transfer point is after receiving the descending channel information of receiving terminal feedback, again the descending channel information of receiving terminal feedback is transmitted to predefined central transmission point.

When channel information acquisition device is predefined non-transfer point node, predefined non-transfer point node need to be determined descending channel information and the up channel matrix of each transfer point or the associating up channel matrix of each transfer point of receiving terminal feedback.Wherein, the associating up channel matrix of the up channel matrix of each transfer point or each transfer point can send to this predefined non-transfer point node by up channel matrix separately by each transfer point, and the descending channel information of receiving terminal feedback can directly feed back to all descending channel informations a transfer point by receiving terminal, by this transfer point, be transmitted to predefined non-transfer point node again, also can the descending channel information of corresponding each transfer point be fed back to respectively to a plurality of transfer points by receiving terminal, these transfer points are after receiving the descending channel information of receiving terminal feedback, again the descending channel information of receiving terminal feedback is transmitted to predefined non-transfer point node, certainly, in the situation that allowing, can also directly all descending channel informations be fed back to this predefined non-transfer point node by receiving terminal.

During receiving terminal feedback of down channel information, can initiatively regularly feed back, also can under the triggering of transmitting terminal, feed back.

As long as the descending channel information of receiving terminal feedback can make transmitting terminal determine the reciprocal relation between down channel and up channel, can be corresponding each transfer point determine at least one element in should the down channel matrix of transfer point, also can be corresponding at least one channel ratio of determining except each transfer point of setting transfer point, wherein, the corresponding definite channel ratio of transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point, can also be for part transfer point feedback to channel ratio that should transfer point, for other transfer point, feed back at least one element in the down channel matrix of this transfer point.

Concrete, corresponding each transfer point of receiving terminal feedback determine at least one element in should the down channel matrix of transfer point time, transmitting terminal by this at least N element determine the reciprocal relation between down channel and up channel.

Suppose that receiving terminal has NR root reception antenna, need to measure altogether the combined channel of N transfer point, n transfer point has NTn root transmitting antenna, and receiving terminal, according to descending pilot frequency, can measure descending combined channel so, and descending combined channel can be expressed as

the complex matrix H of dimension ^dL,

$H^{\mathrm{DL}}=\left[\begin{array}{cccc}{H}_1^{\mathrm{DL}}& H_2^{\mathrm{DL}}& ...& H_N^{\mathrm{DL}}\end{array}\right]$

Wherein, for dimension complex matrix is that n transfer point is to the down channel matrix of this receiving terminal. $h_{i,j}^{\mathrm{DL},n},n=1,...,N,i=1,...,N_R,j=1,...,N_T^n,$ Represent

the capable j column element of i.

Transmitting terminal utilizes ascending pilot frequency, can measure receiving terminal to the up channel of each transfer point, is expressed as

for

dimension complex matrix, $h_{i,j}^{\mathrm{UL},n},n=1,...,N,i=1,...,N_R,j=1,...,N_T^n,$ Represent

the capable j column element of i.Because each antenna in transfer point has completed calibration, down channel

and up channel

between approximate meet following relation:

$H_n^{\mathrm{UL}}={\mathrm{\α}}_n{H}_n^{\mathrm{DL}},n=1,...,N$

Wherein, α _nfor plural number, and it is constant.Due to the antenna calibration not completing between each transfer point, when n gets different value, α _n, n=1 ..., in N, each is unequal for element.Therefore cannot directly obtain associating down channel matrix by up channel matrix.

So, as long as the descending channel information of receiving terminal feedback can make transmitting terminal know α _n, n=1 ..., the proportionate relationship between each element of N, has determined the down channel of each transfer point and the reciprocal relation between up channel, transmitting terminal just can basis like this ${\mathrm{\α}}_1{H}^{\mathrm{DL}}=\left[\begin{array}{cccc}{H}_1^{\mathrm{UL}}& \frac{{\mathrm{\α}}_1}{{\mathrm{\α}}_2}\·H_2^{\mathrm{UL}}& ...& \frac{{\mathrm{\α}}_1}{{\mathrm{\α}}_N}\·H_N^{\mathrm{UL}}\end{array}\right]$ Determine associating down channel.

If receiving terminal, to each down channel matrix, all at least feeds back an element

while feeding back altogether at least N channel element, transmitting terminal can be determined:

${\mathrm{\α}}_m{H}^{\mathrm{DL}}=\left[\begin{array}{cccccc}\frac{h_{k_m,l_m}^{\mathrm{UL},m}}{h_{k_1,l_1}^{\mathrm{UL},1}}\·\frac{h_{k_1,l_1}^{\mathrm{DL},1}}{h_{k_m,l_m}^{\mathrm{DL},m}}{H}_1^{\mathrm{UL}}& \frac{h_{k_m,l_m}^{\mathrm{UL},m}}{h_{k_2,l_2}^{\mathrm{UL},2}}\·\frac{h_{k_2,l_2}^{\mathrm{DL},2}}{h_{k_m,l_m}^{\mathrm{DL},m}}\·H_2^{\mathrm{UL}}& ...& H_m^{\mathrm{UL}}& ...& \frac{h_{k_m,l_m}^{\mathrm{UL},m}}{h_{k_N,l_N}^{\mathrm{UL},N}}\·\frac{h_{k_N,l_N}^{\mathrm{DL},N}}{h_{k_m,l_m}^{\mathrm{DL},m}}\·H_N^{\mathrm{UL}}\end{array}\right]$

Wherein, m is the arbitrary integer in 1～N, take the up channel matrix of m transfer point and down channel matrix to determine the reciprocal relation between each up channel matrix and down channel matrix as ratio benchmark.

When m is 1, while using the 1st transfer point for benchmark, transmitting terminal can be determined:

${\mathrm{\α}}_1{H}^{\mathrm{DL}}=\left[\begin{array}{cccc}{H}_1^{\mathrm{UL}}& \frac{h_{k_1,l_1}^{\mathrm{UL},1}}{h_{k_2,l_2}^{\mathrm{UL},2}}\·\frac{h_{k_2,l_2}^{\mathrm{DL},2}}{h_{k_1,l_1}^{\mathrm{DL},1}}\·H_2^{\mathrm{UL}}& ...& \frac{h_{k_1,l_1}^{\mathrm{UL},1}}{h_{k_N,l_N}^{\mathrm{UL},N}}\·\frac{h_{k_N,l_N}^{\mathrm{DL},N}}{h_{k_1,l_1}^{\mathrm{DL},1}}\·H_N^{\mathrm{UL}}\end{array}\right]$

Due to α _mfor constant, so as the coefficient of combining down channel matrix, do not affect the characteristic that transmitting terminal is determined this associating down channel.

Corresponding during except at least one channel ratio that each transfer point of setting transfer point is determined when receiving terminal feedback, transmitting terminal is determined the reciprocal relation between down channel and up channel by each channel ratio.

As a same reason, as long as the descending channel information of receiving terminal feedback can make transmitting terminal know α _n, n=1 ..., the proportionate relationship between each element of N, transmitting terminal just can basis like this ${\mathrm{\α}}_1{H}^{\mathrm{DL}}=\left[\begin{array}{cccc}{H}_1^{\mathrm{UL}}& \frac{{\mathrm{\α}}_1}{{\mathrm{\α}}_2}\·H_2^{\mathrm{UL}}& ...& \frac{{\mathrm{\α}}_1}{{\mathrm{\α}}_N}\·H_N^{\mathrm{UL}}\end{array}\right]$ Determine associating down channel.

If receiving terminal correspondence is determined at least one channel ratio feedback except each transfer point of setting transfer point, feed back altogether at least N-1 channel ratio, the channel ratio of transmitting terminal feedback is:

${\mathrm{\δ}}_n=\frac{h_{k_n,l_n}^{\mathrm{DL},n}}{h_{k_m,l_m}^{\mathrm{DL},m}},n=1,...,N,$ And n ≠ m

Wherein, k _n∈ 1 ..., N _r, k _m∈ 1 ..., N _r,

the k of each transmission value point _nvalue l _nvalue is all pre-set, conventionally, and for convenience of calculation, need to preset m, if do not set m value, when choosing m value, need to make m directly or indirectly not determine the transfer point numbering of ratio relation, the validity of the channel ratio being fed back to guarantee with transfer point n.

For example, if there are 4 transfer points, while determining the channel ratio of the 1st transfer point, use the 3rd transfer point to set up ratio relation, n=1 now, m=3, when determining the channel ratio of the 2nd transfer point, use the 1st transfer point to set up ratio relation, n=2 now, m=1, when determining the channel ratio of 3 transfer points, owing to determining the ratio relation of the 1st transfer point and the 3rd transfer point, do not re-use the 1st transfer point and set up ratio relation, and, owing to can determining the ratio relation between the 2nd transfer point and the 3rd transfer point according to the channel ratio of the channel ratio of the 1st transfer point and the 2nd transfer point, so do not re-use the 2nd transfer point, do not set up ratio relation yet, while being n=3, m ≠ 1, m ≠ 2.

Due to $H_n^{\mathrm{UL}}={\mathrm{\α}}_n{H}_n^{\mathrm{DL}},n=1,...,N,$ So can determine:

$\frac{h_{k_n,l_n}^{\mathrm{UL},n}}{h_{k_m,l_m}^{\mathrm{UL},m}}=\frac{{\mathrm{\α}}_n}{{\mathrm{\α}}_m}\frac{h_{k_n,l_n}^{\mathrm{DL},n}}{h_{k_m,l_m}^{\mathrm{DL},m}}=\frac{{\mathrm{\α}}_n}{{\mathrm{\α}}_m}\·{\mathrm{\δ}}_n$

If m is fixed value, n gets respectively the value of other except m in 1～N, and then can obtain by this formula

value, determined the reciprocal relation between down channel and up channel.

When m value is predefined fixed value, can determine according to following formula the associating down channel matrix H of each transfer point ^dL:

${\mathrm{\α}}_m{H}^{\mathrm{DL}}=\left[\begin{array}{cccccc}\frac{h_{k_m,l_m}^{\mathrm{UL},m}}{h_{k_1,l_1}^{\mathrm{UL},1}}\·{\mathrm{\δ}}_1{H}_1^{\mathrm{UL}}& \frac{h_{k_m,l_m}^{\mathrm{UL},m}}{h_{k_2,l_2}^{\mathrm{UL},2}}\·{\mathrm{\δ}}_2\·H_2^{\mathrm{UL}}& ...& H_m^{\mathrm{UL}}& ...& \frac{h_{k_m,l_m}^{\mathrm{UL},m}}{h_{k_N,l_N}^{\mathrm{UL},N}}\·{\mathrm{\δ}}_N\·H_N^{\mathrm{UL}}\end{array}\right]$

Wherein,

be the up channel matrix of n transfer point, α _mfor constant, represent the difference of m transfer point up-downgoing channel.

Concrete, when m is set as 1, the channel ratio that fed back is:

${\mathrm{\δ}}_n=\frac{h_{k_n,l_n}^{\mathrm{DL},n}}{h_{k_1,l_1}^{\mathrm{DL},1}},n=2,...,N$

And then can determine: $\frac{h_{k_n,l_n}^{\mathrm{UL},n}}{h_{k_1,l_1}^{\mathrm{UL},1}}=\frac{{\mathrm{\α}}_n}{{\mathrm{\α}}_1}\frac{h_{k_n,l_n}^{\mathrm{DL},n}}{h_{k_1,l_1}^{\mathrm{DL},1}}=\frac{{\mathrm{\α}}_n}{{\mathrm{\α}}_1}\·{\mathrm{\δ}}_n,n=2,...,N$

Therefore can obtain: $\frac{{\mathrm{\α}}_1}{{\mathrm{\α}}_n}=\frac{h_{k_1,l_1}^{\mathrm{UL},1}}{h_{k_n,l_n}^{\mathrm{UL},n}}\·{\mathrm{\δ}}_n,n=2,...,N$

Can utilize as follows up channel to obtain down channel:

${\mathrm{\α}}_1{H}^{\mathrm{DL}}=\left[\begin{array}{cccc}{H}_1^{\mathrm{UL}}& \frac{h_{k_1,l_1}^{\mathrm{UL},1}}{h_{k_2,l_2}^{\mathrm{UL},2}}\·{\mathrm{\δ}}_2\·H_2^{\mathrm{UL}}& ...& \frac{h_{k_1,l_1}^{\mathrm{UL},1}}{h_{k_N,l_N}^{\mathrm{UL},N}}\·{\mathrm{\δ}}_N\·H_N^{\mathrm{UL}}\end{array}\right]$

Certainly, receiving terminal also can be for part transfer point feedback channel ratio, and to the element in another part transfer point feedback of down channel matrix, institute's feedback information can make transmitting terminal obtain α in a word _n, n=1 ..., ratio between any two in N, can utilize up channel matrix to obtain associating down channel matrix according to the following formula:

${\mathrm{\α}}_1{H}^{\mathrm{DL}}=\left[\begin{array}{cccc}{H}_1^{\mathrm{UL}}& \frac{{\mathrm{\α}}_1}{{\mathrm{\α}}_2}\·H_2^{\mathrm{UL}}& ...& \frac{{\mathrm{\α}}_1}{{\mathrm{\α}}_N}\·H_N^{\mathrm{UL}}\end{array}\right]$

As long as the descending channel information feeding back is enough and effectively, the method that those skilled in the art can provide by the embodiment of the present invention, passes through the element acquisition α in channel ratio and/or down channel matrix by mathematical computations _n, n=1 ..., ratio between any two in N, and then determine associating down channel matrix.

For example, the descending channel information of feedback comprise at least one element in the down channel matrix of described corresponding transfer point and/or comprise setting element in the down channel matrix of corresponding transfer point and the down channel matrix of non-setting transfer point in the ratio of setting element time, can determine in the following way the associating down channel matrix of each transfer point:

First according at least one element in the down channel matrix of corresponding transfer point and/or according to the ratio of the setting element in the down channel matrix of the setting element in the down channel matrix of each corresponding transfer point and non-setting transfer point, determine each transfer point and the channel ratio of setting transfer point:

${\mathrm{\δ}}_n=\frac{h_{k_n,l_n}^{\mathrm{DL},n}}{h_{k_m,l_m}^{\mathrm{DL},m}},n=1,...,N$ And n ≠ m

Like this, add the directly channel ratio of feedback of receiving terminal, transmitting terminal has just been known at least N-1 effective channel ratio, can determine according to following formula the associating down channel matrix H of each transfer point ^dL:

${\mathrm{\α}}_m{H}^{\mathrm{DL}}=\left[\begin{array}{cccccc}\frac{h_{k_m,l_m}^{\mathrm{UL},m}}{h_{k_1,l_1}^{\mathrm{UL},1}}\·{\mathrm{\δ}}_1{H}_1^{\mathrm{UL}}& \frac{h_{k_m,l_m}^{\mathrm{UL},m}}{h_{k_2,l_2}^{\mathrm{UL},2}}\·{\mathrm{\δ}}_2\·H_2^{\mathrm{UL}}& ...& H_m^{\mathrm{UL}}& ...& \frac{h_{k_m,l_m}^{\mathrm{UL},m}}{h_{k_N,l_N}^{\mathrm{UL},N}}\·{\mathrm{\δ}}_N\·H_N^{\mathrm{UL}}\end{array}\right]$

Wherein, the quantity that N is transfer point,

for receiving terminal is to n transfer point

dimension up channel matrix, N _rfor the number of antennas of receiving terminal,

for the number of antennas of n transfer point in N transfer point, represent down channel matrix

in k _nrow l _ncolumn element, k _nand l _nfor predefined value, and k _n∈ 1 ..., N _r,

m is the numbering of setting transfer point, and m ∈ 1 ..., N}, α _mfor constant, represent the difference of m transfer point up-downgoing channel.

The channel feedback of processing for single community receiver, the channel information acquisition method that can use the embodiment of the present invention to provide equally, for example: the Serving cell that transfer point 1 is this user, based on down channel

the receiving matrix that calculates this user is L * N _rdimension matrix

wherein L represents data fluxion, () ^hrepresent conjugate transpose, descending equivalent channel is: $H_{\mathrm{eq}}^{\mathrm{DL}}=U_1^{\mathrm{DLH}}{H}^{\mathrm{DL}},H_{\mathrm{eq}}^{\mathrm{DL}}=\left[\begin{array}{cccc}{H}_{\mathrm{eq},1}^{\mathrm{DL}}& H_{\mathrm{eq},2}^{\mathrm{DL}}& ...& H_{\mathrm{eq},N}^{\mathrm{DL}}\end{array}\right],H_{\mathrm{eq},n}^{\mathrm{DL}},n=1,...,N$ For each cell downlink equivalent channel; Based on up channel

the receiving matrix that calculates this user is L * N _rdimension matrix

the equivalent channel being obtained by up channel is $H_{\mathrm{eq}}^{\mathrm{UL}}=U_1^{\mathrm{ULH}}{H}^{\mathrm{UL}},H_{\mathrm{eq}}^{\mathrm{UL}}=\left[\begin{array}{cccc}{H}_{\mathrm{eq},1}^{\mathrm{UL}}& H_{\mathrm{eq},2}^{\mathrm{UL}}& ...& H_{\mathrm{eq},N}^{\mathrm{UL}}\end{array}\right],$

for each cell uplink equivalent channel.Between up-downgoing equivalent channel, meet:

therefore,, after the reciprocal relation of having known between up-downgoing equivalent channel, can determine descending equivalent channel matrix by the reciprocal relation between up equivalent channel matrix and up-downgoing equivalent channel.

At receiving terminal feedback element value

or feedback channel ratio ${\mathrm{\δ}}_n=\frac{h_{k_n,l_n}^{\mathrm{DL},n}}{h_{k_m,l_m}^{\mathrm{DL},m}},n=1,...,N$ And during n ≠ m, k wherein _n, l _nbe all pre-set, set too the setting element of each transfer point at transmitting terminal, like this, terminal, when the feedback element value of corresponding transfer point or channel ratio, as long as order is fed back one group of numerical value, does not need to feed back k _nand l _n, wherein, k _nand l _ncan pass through standard setting, also can set by high-level signaling.

Receiving terminal, when feedback element value or feedback channel ratio, can quantize element value or channel ratio, and the value after feedback quantization, so that channel information is fed back, has further reduced the burden that feedback channel information causes system simultaneously.

Certainly, for each transfer point, receiving terminal feeds back at least one element value, feed back at least N element value, or for other transfer point except setting transfer point, receiving terminal feeds back at least one channel ratio, feed back at least N-1 channel ratio, when receiving terminal only feeds back N element value or N-1 channel ratio, just can determine the reciprocal relation between down channel and up channel, in the situation that system condition allows, receiving terminal can feed back several element values or channel ratio more, thereby can be so that transmitting terminal be determined the reciprocal relation between down channel and up channel more accurately, and then further improve the accuracy of the down channel that transmitting terminal obtains.

The embodiment of the present invention also provides a kind of channel information feedback method accordingly, as shown in Figure 3, comprising:

Step S301, the down channel matrix of determining each transfer point or associating down channel matrix;

Step S302, according to the down channel matrix of each transfer point or associating down channel matrix, feedback of down channel information.

In step S301, receiving terminal can obtain by descending pilot frequency down channel matrix or the associating down channel matrix of each transfer point.

Receiving terminal is feedback of down channel information initiatively regularly, also can be after the triggering that obtains transmitting terminal feedback of down channel information, thereby further reduce the feedback quantity of receiving terminal, the burden of mitigation system.

Receiving terminal can feed back to the descending channel information of feedback a predefined central transmission point, also the descending channel information of corresponding each transfer point can be fed back to respectively to each transfer point, when carrying out obtaining of channel information by predefined non-transfer point node, receiving terminal also can directly feed back to the descending channel information of feedback predefined non-transfer point node.So, in step S302, to transfer point feedback of down channel information, be specially:

To predefined central transmission point feedback of down channel information; Or

To each transfer point feedback to descending channel information that should transfer point; Or

To predefined non-transfer point node, feed back described descending channel information.

Receiving terminal is to receiving terminal feedback of down channel information, can be to corresponding each transfer point of transfer point feedback, at least one channel ratio of determining and/or at least one element in should the down channel matrix of transfer point, also can be to corresponding each transfer point except setting transfer point of transfer point feedback, at least one channel ratio of determining, wherein, the corresponding definite channel ratio of transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point.

; receiving terminal can be at least one element in the down channel matrix of corresponding each transfer point of transfer point feedback; N element value at least, also can feed back corresponding each transfer point except setting transfer point, at least one definite channel ratio; i.e. N-1 channel ratio at least; certainly, also can feed back at least one element in its down channel matrix to a part of transfer point, another part transfer point is fed back at least one channel ratio; now, also need at least to feed back N value.

Concrete, the channel ratio feeding back is specially:

${\mathrm{\δ}}_n=\frac{h_{k_n,l_n}^{\mathrm{DL},n}}{h_{k_m,l_m}^{\mathrm{DL},l}},n=1,...,N,$ And n ≠ m

Wherein, the quantity that N is transfer point,

represent down channel matrix

in k _nrow l _ncolumn element, k _nand l _nfor predefined value, and k _n∈ 1 ..., N _r,

be that n transfer point arrives receiving terminal

dimension down channel matrix, N _rfor the number of antennas of receiving terminal,

for the number of antennas of n transfer point in N transfer point, m is predefined value, and m ∈ 1 ..., N}.

Accordingly, the embodiment of the present invention also provides a kind of channel information acquisition system, as shown in Figure 4, comprising:

Receiving terminal 401, for determining down channel matrix or the associating down channel matrix of each transfer point; And according to the down channel matrix of each transfer point or associating down channel matrix, feedback of down channel information.

Centroid 402, for obtaining receiving terminal to the channel parameter of the up channel of each transfer point, determines that receiving terminal arrives the up channel matrix of each transfer point; According to the down channel of the up channel matrix of each transfer point and definite each transfer point and the reciprocal relation between up channel, determine the associating down channel matrix of each transfer point, wherein, the down channel of each transfer point and the reciprocal relation between up channel are determined according to the descending channel information of the up channel parameter of each transfer point and receiving terminal feedback.

When Centroid 402 need to upgrade the down channel of each transfer point and the reciprocal relation between up channel, Centroid 402 also for, obtain the descending channel information of receiving terminal feedback, and determine the down channel of each transfer point and the reciprocal relation between up channel according to the descending channel information of the up channel parameter of each transfer point and receiving terminal feedback.

Wherein, Centroid 402 can be specially:

Predefined central transmission point or predefined non-transfer point node.

When Centroid 402 is predefined central transmission point, time, this predefined central transmission point also for: receive the channel parameter of the up channel that other transfer point sends, determine the up channel matrix of each transfer point; Now, other transfer point also for, the channel parameter of up channel is sent to predefined transfer point.

When receiving terminal is during to transfer point feedback of down channel information, be when the descending channel information of corresponding each transfer point is fed back to respectively to each transfer point, predefined central transmission point is also for the descending channel information that receives the receiving terminal feedback that other transfer point sends; Now, other transfer point also for, after receiving the descending channel information of receiving terminal feedback, the descending channel information of receiving terminal feedback is transmitted to predefined transfer point.Thereby the descending channel information of receiving terminal feedback is focused in predefined central transmission point, by predefined central transmission point, determined the associating down channel matrix of each transfer point.

When Centroid 402 is specially predefined non-transfer point node, and while the up channel matrix of each transfer point not being set in predefined non-transfer point node, this predefined non-transfer point node also for:

Receive the channel parameter of the up channel of each transfer point transmission, determine the up channel matrix of each transfer point; Now, each transfer point is used for, and the channel parameter of up channel is sent to predefined non-transfer point node.

If receiving terminal does not directly feed back to descending channel information predefined non-transfer point node, but feed back to transfer point, need to this descending channel information be transmitted to predefined non-transfer point node by the transfer point that receives descending channel information, now, this predefined non-transfer point node also for:

Receive the descending channel information of the receiving terminal feedback of each transfer point transmission;

Transfer point also for, after receiving the descending channel information of receiving terminal feedback, the descending channel information of receiving terminal feedback is transmitted to predefined non-transfer point node.

The embodiment of the present invention is also corresponding provides a kind of channel information acquisition device, and this device can be specially predefined central transmission point, or the predefined non-transfer point node such as base station, and as shown in Figure 5, this device comprises:

Obtain unit 501, for obtaining receiving terminal to the channel parameter of the up channel of each transfer point, determine that receiving terminal arrives the up channel matrix of each transfer point;

Channel information acquisition unit 502, for according to the down channel of the up channel matrix of each transfer point and definite each transfer point and the reciprocal relation between up channel, determine the associating down channel matrix of each transfer point, wherein, the down channel of each transfer point and the reciprocal relation between up channel are determined according to the descending channel information of the up channel parameter of each transfer point and receiving terminal feedback.

When needing channel information acquisition device to upgrade the down channel of each transfer point and the reciprocal relation between up channel, obtain unit 501 also for:

Obtain the descending channel information of receiving terminal feedback, and determine the down channel of each transfer point and the reciprocal relation between up channel according to the descending channel information of the up channel parameter of each transfer point and receiving terminal feedback.

When this device is specially predefined central transmission point, obtain unit 501 specifically for:

Receive the channel parameter of the up channel of other transfer point transmission, determine that receiving terminal arrives the up channel matrix of each transfer point.

When receiving terminal is during to transfer point feedback of down channel information, be when the descending channel information of corresponding each transfer point is fed back to respectively to each transfer point, in predefined central transmission point, obtain unit 501 also for:

Receive the descending channel information of the receiving terminal feedback of other transfer point transmission.

When this device is specially predefined non-transfer point node, obtain unit 501 specifically for:

Receive the channel parameter of the up channel of each transfer point transmission, determine that each receiving terminal is to the up channel matrix of transfer point.

When receiving terminal is during to transfer point feedback of down channel information, be that descending channel information is fed back to transfer point, rather than feed back to predefined non-transfer point node, now, in predefined non-transfer point node, obtain unit 501 also for:

Receive the descending channel information of the receiving terminal feedback of each transfer point transmission.

The embodiment of the present invention is also corresponding provides a kind of feedback of channel information device, and this device can be specially the receiving terminals such as user terminal, can be also other receiving terminal node, and as shown in Figure 6, this device comprises:

Determining unit 601, for determining down channel matrix or the associating down channel matrix of each transfer point;

Feedback unit 602, for according to the down channel matrix of each transfer point or associating down channel matrix, feedback of down channel information.

The invention provides a kind of channel information acquisition and feedback method, system and device, in the situation that not carrying out antenna calibration between a plurality of transfer points, by receiving terminal, feed back a small amount of channel information, utilize channel reciprocity and received channel information to determine the combined channel of a plurality of transfer points simultaneously, owing to having determined the down channel of each transfer point and the reciprocal relation between up channel according to institute's feedack, according to this reciprocal relation, determine down channel again, thereby improved the accuracy of the down channel that transmitting terminal obtains.

Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.

Claims (14)

1. a channel information acquisition method, is characterized in that, comprising:

Obtain receiving terminal to the channel parameter of the up channel of each transfer point, determine that receiving terminal arrives the up channel matrix of each transfer point;

According to the down channel of the up channel matrix of each transfer point and definite each transfer point and the reciprocal relation between up channel, determine the associating down channel matrix of each transfer point, the down channel of described each transfer point and the reciprocal relation between up channel are determined according to the descending channel information of the up channel parameter of each transfer point and receiving terminal feedback;

The descending channel information of described receiving terminal feedback, is specially:

Each transfer point of correspondence of receiving terminal feedback, at least one channel ratio of determining or at least one definite channel ratio and at least one element in should the down channel matrix of transfer point, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point; Or

The correspondence of receiving terminal feedback is except each transfer point of setting transfer point, at least one channel ratio of determining, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point.

2. the method for claim 1, it is characterized in that, described, according to the down channel of the up channel matrix of each transfer point and definite each transfer point and the reciprocal relation between up channel, before determining the associating down channel matrix of each transfer point, also comprise:

Obtain the descending channel information of receiving terminal feedback, and determine the down channel of each transfer point and the reciprocal relation between up channel according to the descending channel information of the up channel parameter of each transfer point and receiving terminal feedback.

3. method as claimed in claim 1 or 2, is characterized in that, described channel ratio is specially: the ratio of the setting element in the down channel matrix of the setting element in the down channel matrix of this transfer point and setting transfer point.

4. method as claimed in claim 3, it is characterized in that, setting element in the down channel matrix that the definite channel ratio of a described corresponding transfer point is this transfer point is when presetting the ratio of the setting element in the down channel matrix of transfer point, described to each transfer point except predefined transfer point, at least one channel ratio of receiving terminal feedback, is specially:

, and n ≠ m

Wherein, the quantity that N is transfer point, represent down channel matrix

in k _nrow l _ncolumn element, k _nand l _nfor predefined value, and k _n∈ 1 ..., N _r,

be that n transfer point arrives receiving terminal

dimension down channel matrix, N _rfor the number of antennas of receiving terminal,

for the number of antennas of n transfer point in N transfer point, m is the numbering of described setting transfer point, and m ∈ 1 ..., N}.

5. method as claimed in claim 4, it is characterized in that, described according to the down channel of the up channel matrix of each transfer point and definite each transfer point and the reciprocal relation between up channel, determine the associating down channel matrix of each transfer point, specifically comprise:

According to following formula, determine the associating down channel matrix H of each transfer point ^dL:

Wherein,

for receiving terminal is to n transfer point dimension up channel matrix, N _rfor the number of antennas of receiving terminal,

for the number of antennas of n transfer point in N transfer point, m is the numbering of described setting transfer point, and m ∈ 1 ..., N}, α _mfor constant, represent the difference of m transfer point up-downgoing channel.

6. method as claimed in claim 1 or 2, it is characterized in that, when the descending channel information of described receiving terminal feedback comprise the ratio of the setting element in the down channel matrix of setting element in the down channel matrix of corresponding transfer point and non-setting transfer point or comprise at least one element in the down channel matrix of described corresponding transfer point and the down channel matrix of corresponding transfer point in setting element and during the ratio of the setting element in the down channel matrix of non-setting transfer point, described according to the down channel of the up channel matrix of each transfer point and definite each transfer point and the reciprocal relation between up channel, determine the associating down channel matrix of each transfer point, specifically comprise:

According at least one element in the down channel matrix of corresponding transfer point and/or according to the ratio of the setting element in the down channel matrix of the setting element in the down channel matrix of each corresponding transfer point and non-setting transfer point, determine each transfer point and the channel ratio of setting transfer point:

and n ≠ m

According to following formula, determine the associating down channel matrix H of each transfer point ^dL:

Wherein, the quantity that N is transfer point, for receiving terminal is to n transfer point dimension up channel matrix, N _rfor the number of antennas of receiving terminal,

for the number of antennas of n transfer point in N transfer point,

represent down channel matrix

in k _nrow l _ncolumn element, k _nand l _nfor predefined value, and k _n∈ 1 ..., N _r,

m is the numbering of described setting transfer point, and m ∈ 1 ..., N}, α _mfor constant, represent the difference of m transfer point up-downgoing channel.

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

Determine down channel matrix or the associating down channel matrix of each transfer point;

According to the down channel matrix of described each transfer point or associating down channel matrix, feedback of down channel information;

Described feedback of down channel information is specially:

Corresponding each transfer point of feedback, at least one channel ratio of determining or at least one definite channel ratio and at least one element in should the down channel matrix of transfer point, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point; Or

Corresponding each transfer point except setting transfer point of feedback, at least one channel ratio of determining, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point.

8. method as claimed in claim 7, is characterized in that, described channel ratio is specially:

and n ≠ m

Wherein, the quantity that N is transfer point,

represent down channel matrix

in k _nrow l _ncolumn element, k _nand l _nfor predefined value, and k _n∈ 1 ..., NR},

be that n transfer point arrives receiving terminal

dimension down channel matrix, N _rfor the number of antennas of receiving terminal,

for the number of antennas of n transfer point in N transfer point, m is predefined value, and m ∈ 1 ..., N}.

9. method as claimed in claim 7 or 8, is characterized in that, described feedback of down channel information is specially:

To predefined central transmission point, feed back described descending channel information; Or

To each transfer point feedback to descending channel information that should transfer point; Or

To predefined non-transfer point node, feed back described descending channel information.

10. a channel information acquisition system, is characterized in that, comprising:

Receiving terminal, for determining down channel matrix or the associating down channel matrix of each transfer point; And according to the down channel matrix of described each transfer point or associating down channel matrix, feedback of down channel information; Described descending channel information, be specially: corresponding each transfer point, at least one channel ratio of determining or at least one definite channel ratio and at least one element in should the down channel matrix of transfer point, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point; Or corresponding each transfer point except setting transfer point, at least one channel ratio of determining, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point;

Centroid, for obtaining receiving terminal to the channel parameter of the up channel of each transfer point, determines that receiving terminal arrives the up channel matrix of each transfer point; According to the down channel of the up channel matrix of each transfer point and definite each transfer point and the reciprocal relation between up channel, determine the associating down channel matrix of each transfer point, the down channel of described each transfer point and the reciprocal relation between up channel are determined according to the descending channel information of the up channel parameter of each transfer point and receiving terminal feedback.

11. systems as claimed in claim 10, is characterized in that, described Centroid also for:

Obtain the descending channel information of receiving terminal feedback, and determine the down channel of each transfer point and the reciprocal relation between up channel according to the descending channel information of the up channel parameter of each transfer point and receiving terminal feedback.

12. 1 kinds of channel information acquisition devices, is characterized in that, comprising:

Obtain unit, for obtaining receiving terminal to the channel parameter of the up channel of each transfer point, determine that receiving terminal arrives the up channel matrix of each transfer point;

Channel information acquisition unit, for according to the down channel of the up channel matrix of each transfer point and definite each transfer point and the reciprocal relation between up channel, determine the associating down channel matrix of each transfer point, the down channel of described each transfer point and the reciprocal relation between up channel are determined according to the descending channel information of the up channel parameter of each transfer point and receiving terminal feedback;

The descending channel information of described receiving terminal feedback, be specially: each transfer point of correspondence of receiving terminal feedback, at least one channel ratio of determining or at least one definite channel ratio and at least one element in should the down channel matrix of transfer point, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point; Or the correspondence of receiving terminal feedback is except each transfer point of setting transfer point, at least one channel ratio of determining, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point.

13. devices as claimed in claim 12, is characterized in that, described acquisition unit also for:

Obtain the descending channel information of receiving terminal feedback, and determine the down channel of each transfer point and the reciprocal relation between up channel according to the descending channel information of the up channel parameter of each transfer point and receiving terminal feedback.

14. 1 kinds of feedback of channel information devices, is characterized in that, comprising:

Determining unit, for determining down channel matrix or the associating down channel matrix of each transfer point;

Feedback unit, for according to the down channel matrix of described each transfer point or associating down channel matrix, feedback of down channel information;

Described feedback of down channel information is specially:

Corresponding each transfer point of feedback, at least one channel ratio of determining or at least one definite channel ratio and at least one element in should the down channel matrix of transfer point, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point; Or

Corresponding each transfer point except setting transfer point of feedback, at least one channel ratio of determining, the definite channel ratio of a described corresponding transfer point is: the setting element in the down channel matrix of this transfer point with directly or indirectly do not determine the ratio of the setting element in the down channel matrix of transfer point of ratio relation with this transfer point.

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