CN102237950B - A kind of subscriber equipment, base station and channel information feedback method - Google Patents

Abstract

The present invention provides a kind of subscriber equipment, base station and channel information feedback method, and this subscriber equipment includes: the first wireless communication module; First extraction module, is used for extracting little yardstick channel condition information; Weighting block, processes for utilizing the weighted factor relevant to planisphere and little yardstick channel condition information that little yardstick channel condition information is weighted, obtains the little yardstick channel condition information after weighting; First quantization modules, is used for utilizing planisphere, each element of the little yardstick channel condition information after weighting is carried out quantification treatment, obtains CDI; Second extraction module, is used for extracting large scale channel condition information; Second quantization modules, obtains channel condition information CQI for the product of large scale channel condition information Yu weighter factor is carried out quantization; Feedback module, is used for utilizing the first wireless communication module to base station feedback CDI and CQI, for base station reconfiguration channel, to carry out downlink transfer process. The present invention improves the data rate of user.

Description

A kind of subscriber equipment, base station and channel information feedback method

Technical field

The present invention relates to wireless mobile communications field, particularly a kind of subscriber equipment, base station and channel information feedback method.

Background technology

In FDD multiplex system (FDD), user needs with the form of CDI (channel direction information) and CQI (channel quality information), channel condition information is fed back to base station end, base station end utilizes CDI and the CQI of feedback to reconstruct channel, carries out the methods such as precoding further according to the channel reconstructed and carries out downlink transfer.

In multiple-antenna MIMO system, user needs the channel condition information of one base station of feedback; Wherein each status information includes large scale channel condition information and little yardstick channel condition information. Large scale channel condition information is mainly determined by the relative position of user with base station, and little yardstick channel condition information then characterizes the fading status between base station and the antenna of user, and it is 0 that each element therein meets average, and variance is the multiple Gaussian random variable of 1. And in coordinate multipoint (CoMP) system, user needs to feed back multiple channel condition informations of multiple base station.

A kind of channel information feedback method of prior art utilizes planisphere to realize,

Fig. 1 show the schematic diagram of 4bits planisphere.

Shown in Fig. 1, utilize planisphere to carry out the feedback of channel information each little yardstick element mainly by planisphere quantized channel status information as shown in Figure 1.

It is 0 that each element of little yardstick channel condition information meets average, and variance is the multiple Gaussian random variable of 1. Planisphere is utilized to quantify little yardstick channel condition information element.

As in figure 2 it is shown, the method handling process includes:

Step 21, subscriber equipment extracts little yardstick channel condition information;

Step 22, subscriber equipment utilizes planisphere that each little yardstick channel condition information element is carried out quantization to obtain CDI;

Step 23, subscriber equipment extracts large scale channel condition information;

Step 24, large scale channel condition information is quantified to obtain CQI by subscriber equipment.

Step 25, subscriber equipment feedback CQI and CDI, utilize CQI and the CDI of feedback to reconstruct channel for base station, to carry out downlink transfer process.

But, inventor finds in the process realize the embodiment of the present invention, and at least there are the following problems for prior art:

Although it is 0 that each element of little yardstick channel condition information meets average from the statistical significance, variance is the multiple Gaussian random variable of 1, but the little yardstick channel condition information every time randomly generated has bigger undulatory property. In this case, utilize planisphere to carry out quantization and can produce higher quantization error, cause that systematic function declines.

Summary of the invention

It is an object of the invention to provide a kind of subscriber equipment, base station and channel information feedback method, improve system throughput performance.

To achieve these goals, embodiments provide a kind of subscriber equipment, including:

First wireless communication module;

First extraction module, is used for extracting little yardstick channel condition information;

Weighting block, processes for utilizing the weighted factor relevant to planisphere and little yardstick channel condition information that little yardstick channel condition information is weighted, obtains the little yardstick channel condition information after weighting;

First quantization modules, is used for utilizing planisphere, each element of the little yardstick channel condition information after weighting is carried out quantification treatment, obtains channel direction information CDI;

Second extraction module, is used for extracting large scale channel condition information;

Second quantization modules, obtains channel quality information CQI for the product of large scale channel condition information Yu weighter factor is carried out quantization;

Feedback module, is used for utilizing described first wireless communication module to base station feedback channel direction information CDI and channel quality information CQI, for base station reconfiguration channel, to carry out downlink transfer process.

To achieve these goals, the embodiment of the present invention additionally provides a kind of subscriber equipment, including:

First wireless communication module;

First extraction module, is used for extracting little yardstick channel condition information.

Weighting block, processes for utilizing the weighted factor relevant to planisphere and little yardstick channel condition information that little yardstick channel condition information is weighted, obtains the little yardstick channel condition information after weighting;

First quantization modules, is used for utilizing planisphere, each element of the little yardstick channel condition information after weighting is carried out quantification treatment, obtains channel direction information CDI;

Second extraction module, is used for extracting large scale channel condition information;

3rd quantization modules, obtains channel quality information CQI for the product of large scale channel condition information Yu the mould of little yardstick channel condition information is carried out quantization;

Feedback module, is used for utilizing described first wireless communication module to base station feedback channel direction information and channel quality information, for base station reconfiguration channel, to carry out downlink transfer process;

The channel of base station reconfiguration is

Wherein:

$\stackrel{\‾}{\mathrm{CDI}}={\hat{H}}^{\′}/\left|{\hat{H}}^{\′}\right|$

DescribedDescribed CDI reconstruct is utilized to obtain.

To achieve these goals, the embodiment of the present invention additionally provides a kind of base station, including:

Second wireless communication module;

Receiver module, for receiving CDI and the CQI of subscriber equipment feedback by the second wireless communication module;

Reconstructed module, is used for reconstructing channel:

$\hat{H}=\mathrm{CQI}\·\stackrel{\‾}{\mathrm{CDI}}$

Wherein:

$\stackrel{\‾}{\mathrm{CDI}}={\hat{H}}^{\′}/\left|{\hat{H}}^{\′}\right|$

DescribedThe matrix obtained for utilizing described CDI to reconstruct;

Described CDI is that subscriber equipment utilizes planisphere, the element of the channel condition information after each weighting being carried out quantification treatment obtain, the channel condition information after described weighting is that subscriber equipment utilizes weighter factor that little yardstick channel condition information is weighted process to obtain;

Described CQI is that the product to large scale channel condition information Yu the mould of little yardstick channel condition information carries out quantization and obtains.

To achieve these goals, the embodiment of the present invention additionally provides a kind of channel information feedback method, including:

Subscriber equipment extracts little yardstick channel condition information.

Subscriber equipment utilizes the weighted factor relevant to planisphere and little yardstick channel condition information to be weighted little yardstick channel condition information processing, and obtains the little yardstick channel condition information after weighting;

Subscriber equipment utilizes planisphere, each element of the little yardstick channel condition information after weighting is carried out quantification treatment, obtains channel direction information CDI;

Subscriber equipment extracts large scale channel condition information;

The product of large scale channel condition information Yu weighter factor is carried out quantization and obtains channel quality information CQI by subscriber equipment;

Subscriber equipment utilizes described first wireless communication module to base station feedback channel direction information CDI and channel quality information CQI, for base station reconfiguration channel, to carry out downlink transfer process.

To achieve these goals, the embodiment of the present invention additionally provides a kind of channel information feedback method, including:

Subscriber equipment extracts little yardstick channel condition information.

Utilize the weighted factor relevant to planisphere and little yardstick channel condition information to be weighted little yardstick channel condition information processing, obtain the little yardstick channel condition information after weighting;

Subscriber equipment utilizes planisphere, each element of the little yardstick channel condition information after weighting is carried out quantification treatment, obtains channel direction information CDI;

Subscriber equipment extracts large scale channel condition information;

The product of large scale channel condition information Yu the mould of little yardstick channel condition information is carried out quantization and obtains channel quality information CQI by subscriber equipment;

Subscriber equipment utilizes described first wireless communication module to base station feedback channel direction information and channel quality information, for base station reconfiguration channel, to carry out downlink transfer process;

The channel of base station reconfiguration is

Wherein:

$\stackrel{\‾}{\mathrm{CDI}}={\hat{H}}^{\′}/\left|{\hat{H}}^{\′}\right|$

DescribedDescribed CDI reconstruct is utilized to obtain.

Described weighter factor is:

$\left|H^{\′}\right|\·\sqrt{N}/\sqrt{\left(\underset{n=1}{\overset{N}{\mathrm{\Σ}}}{r}_n^2\right)\·N_R\·N_T};$ Or

$\left|H^{\′}\right|\·N/[\left(\underset{n=1}{\overset{N}{\mathrm{\Σ}}}{r}_n\right)\·\sqrt{N_R\·N_T}]$

Wherein:

N_TFor the number of base station transmission antenna, N_RNumber for subscriber equipment reception antenna;

h_ij', i=1 ..., N_R, j=1 ..., N_TRepresent from jth transmission antenna to the channel condition information of i-th reception antenna, r_nFor constellation radius of graph, N is the radius number of the constellation point of planisphere.

When the Average Element energy of described planisphere is 1, the first weighter factor can be reduced to as follows:

$\left|H^{\′}\right|/\sqrt{N_R\·N_T}.$

The embodiment of the present invention has following beneficial effect:

The present invention, by the little yardstick channel condition information after quantization weighting, reduces error channel element quantified based on planisphere, improves the data rate of user.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of 4bits planisphere;

Fig. 2 existing utilizes planisphere to carry out the schematic flow sheet of feedback of channel information;

Fig. 3 is the schematic flow sheet of the method for first embodiment of the invention;

Fig. 4 is the schematic flow sheet of the method for second embodiment of the invention.

Detailed description of the invention

Before the embodiment of the present invention is described in detail, first some parameters and concept to may relate to are defined, in order to be better understood from the present invention.

Assuming certain base station channel condition information H=lH ' to user, wherein l represents that the large-scale channel information of user is arrived in base station, including path loss, shadow fading and antenna gain.

And little yardstick channel condition information is as follows:

Wherein, N_TFor the number of base station transmission antenna, N_RFor the number of subscriber equipment reception antenna, h_ij', i=1 ..., N_R, j=1 ..., N_TRepresent from jth transmission antenna to the channel condition information of i-th reception antenna.

The method of first embodiment of the invention is as it is shown on figure 3, include:

Step 31, subscriber equipment extracts little yardstick channel condition information H '.

Step 32, subscriber equipment utilizes the weighted factor relevant to planisphere and little yardstick channel condition information to be weighted little yardstick channel condition information processing, and obtains the little yardstick channel condition information after weighting.

Step 33, subscriber equipment utilizes planisphere, each element to the little yardstick channel condition information after weightingCarry out quantification treatment, obtain CDI.

Step 34, subscriber equipment extracts large scale channel condition information l.

Step 35, l �� is carried out quantization and obtains CQI by subscriber equipment.

Step 36, subscriber equipment feedback CQI and CDI, for base station reconfiguration channel, to carry out downlink transfer process.

Utilize cordless communication network to base station feedback CQI and CDI, for base station reconfiguration channel, to carry out downlink transfer process.

The user equipment (UE) of first embodiment of the invention includes:

First wireless communication module;

First extraction module, is used for extracting little yardstick channel condition information H '.

Weighting block, processes for utilizing the weighted factor relevant to planisphere and little yardstick channel condition information that little yardstick channel condition information is weighted, obtains the little yardstick channel condition information after weighting.

First quantization modules, is used for utilizing planisphere, each element to the little yardstick channel condition information after weightingCarry out quantification treatment, obtain CDI.

Second extraction module, is used for extracting large scale channel condition information l.

Second quantization modules, obtains CQI for l �� is carried out quantization.

Feedback module, is used for utilizing described first wireless communication module to base station feedback CQI and CDI, for base station reconfiguration channel, to carry out downlink transfer process.

In the first embodiment of the present invention, this weighter factor is detailed further below.

<mode one>

${\mathrm{\&alpha;}}_1=f_1(H^{\&prime;},r_n)=|H^{\&prime;}|\&CenterDot;\sqrt{N}/\sqrt{\left(\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}{r}_n^2\right)\&CenterDot;N_R\&CenterDot;N_T}$

Wherein, r_nFor constellation radius of graph, n=1,2 ..., N, N are the radius number of the constellation point of planisphere, as it is shown in figure 1, this planisphere includes 2 radiuses, so N=2, and for the planisphere of 4bits, the radius number of its constellation point is 4, then N=4.

For this weighter factor, the little yardstick channel condition information after weightingAs follows:

$\stackrel{\&OverBar;}{H}=H^{\&prime;}/{\mathrm{\&alpha;}}_1$

For the planisphere that Average Element energy is 1, above-mentioned weighting processes and is equivalent to normalized, the little yardstick channel condition information after normalization channelAverage Element energy be 1.

For the planisphere that Average Element energy is 1, following equation is set up:

$N=\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}{r}_n^2$

So, above-mentioned weighter factor can be reduced to:

${\mathrm{\&alpha;}}_1=\left|H^{\&prime;}\right|/\sqrt{N_R\&CenterDot;N_T}$

<mode two>

${\mathrm{\&alpha;}}_2=f_2(H^{\&prime;},r_n)=\left|H^{\&prime;}\right|\&CenterDot;N/[\left(\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}{r}_n\right)\&CenterDot;\sqrt{N_R\&CenterDot;N_T}]$

Wherein, r_nFor constellation radius of graph, n=1,2 ..., N, N are the radius number of the constellation point of planisphere, as it is shown in figure 1, this planisphere includes 2 radiuses, so N=2, and for the planisphere of 4bits, the radius number of its constellation point is 4, then N=4.

For the weighter factor under the second way, the little yardstick channel condition information after weightingAs follows:

$\stackrel{\&OverBar;}{H}=H^{\&prime;}/{\mathrm{\&alpha;}}_2$

Little yardstick channel condition information after above-mentioned weighting processes, after weighting processThe energy of the element average amplitude that Average Element energy is planisphere.

Above-mentioned only list weighting scheme two kinds possible, but it is to be understood that, other can reduce, based on planisphere, the weighting scheme of the error that channel element quantifies be can be used for the embodiment of the present invention, numerous to list herein.

The method of second embodiment of the invention as shown in Figure 4, including:

Step 41, subscriber equipment extracts little yardstick channel condition information H '.

Step 42, subscriber equipment utilizes the weighted factor relevant to planisphere and little yardstick channel condition information to be weighted little yardstick channel condition information processing, and obtains the little yardstick channel condition information after weighting.

Step 43, subscriber equipment utilizes planisphere, each element to the little yardstick channel condition information after weightingCarry out quantification treatment, obtain CDI.

Step 44, subscriber equipment extracts large scale channel condition information l.

Step 45, l | H ' | is carried out quantization and obtains CQI by subscriber equipment.

Step 46, subscriber equipment feedback CQI and CDI, for base station reconfiguration channel, to carry out downlink transfer process, and the channel information that base station reconfiguration obtains is:

$\hat{H}=\mathrm{CQI}\&CenterDot;\stackrel{\&OverBar;}{\mathrm{CDI}}$

Wherein:

$\stackrel{\&OverBar;}{\mathrm{CDI}}={\hat{H}}^{\&prime;}/\left|{\hat{H}}^{\&prime;}\right|$

DescribedThe matrix obtained for utilizing described CDI to reconstruct.

The user equipment (UE) of second embodiment of the invention includes:

First wireless communication module;

First extraction module, is used for extracting little yardstick channel condition information H '.

Weighting block, processes for utilizing the weighted factor relevant to planisphere and little yardstick channel condition information that little yardstick channel condition information is weighted, obtains the little yardstick channel condition information after weighting.

First quantization modules, is used for utilizing planisphere, each element to the little yardstick channel condition information after weightingCarry out quantification treatment, obtain CDI.

Second extraction module, is used for extracting large scale channel condition information l.

3rd quantization modules, obtains CQI for l | H ' | is carried out quantization.

Feedback module, is used for utilizing described first wireless communication module to base station feedback CQI and CDI, as follows for base station reconfiguration channel:

$\hat{H}=\mathrm{CQI}\&CenterDot;\stackrel{\&OverBar;}{\mathrm{CDI}}$

Wherein:

$\stackrel{\&OverBar;}{\mathrm{CDI}}={\hat{H}}^{\&prime;}/\left|{\hat{H}}^{\&prime;}\right|$

DescribedThe matrix obtained for utilizing described CDI to reconstruct.

The base station of the embodiment of the present invention includes:

Second wireless communication module;

Receiver module, for receiving CDI and the CQI of subscriber equipment feedback by the second wireless communication module;

Reconstructed module, is used for reconstructing channel as follows:

$\hat{H}=\mathrm{CQI}\&CenterDot;\stackrel{\&OverBar;}{\mathrm{CDI}}$

Wherein:

$\stackrel{\&OverBar;}{\mathrm{CDI}}={\hat{H}}^{\&prime;}/\left|{\hat{H}}^{\&prime;}\right|$

DescribedThe matrix obtained for utilizing described CDI to reconstruct;

Communications Processor Module, utilizes reconstruct channel downstream transmission process.

In the first embodiment of the present invention, this weighter factor is detailed further below.

<mode one>

${\mathrm{\&alpha;}}_1=f_1(H^{\&prime;},r_n)=\left|H^{\&prime;}\right|\&CenterDot;\sqrt{N}/\sqrt{\left(\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}{r}_n^2\right)\&CenterDot;N_R\&CenterDot;N_T}$

Wherein, r_nFor constellation radius of graph, n=1,2 ..., N, N are the radius number of the constellation point of planisphere, as it is shown in figure 1, this planisphere includes 2 radiuses, so N=2, and for the planisphere of 4bits, the radius number of its constellation point is 4, then N=4.

For this weighter factor, the little yardstick channel condition information after weightingAs follows:

$\stackrel{\&OverBar;}{H}=H^{\&prime;}/{\mathrm{\&alpha;}}_1$

For the planisphere that Average Element energy is 1, above-mentioned weighting processes and is equivalent to normalized, the little yardstick channel condition information after normalization channelAverage Element energy be 1.

For the planisphere that Average Element energy is 1, following equation is set up:

$N=\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}{r}_n^2$

So, above-mentioned weighter factor can be reduced to:

${\mathrm{\&alpha;}}_1=\left|H^{\&prime;}\right|/\sqrt{N_R\&CenterDot;N_T}$

<mode two>

${\mathrm{\&alpha;}}_2=f_2(H^{\&prime;},r_n)=\left|H^{\&prime;}\right|\&CenterDot;N/[\left(\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}{r}_n\right)\&CenterDot;\sqrt{N_R\&CenterDot;N_T}]$

Wherein, r_nFor constellation radius of graph, n=1,2 ..., N, N are the radius number of the constellation point of planisphere, as it is shown in figure 1, this planisphere includes 2 radiuses, so N=2, and for the planisphere of 4bits, the radius number of its constellation point is 4, then N=4.

For the weighter factor under the second way, the little yardstick channel condition information after weightingAs follows:

$\stackrel{\&OverBar;}{H}=H^{\&prime;}/{\mathrm{\&alpha;}}_2$

Little yardstick channel condition information after above-mentioned weighting processes, after weighting processThe energy of the element average amplitude that Average Element energy is planisphere.

It should be appreciated that said method may be used for the MIMO transmission between single-user equipment and single base station, it is also possible to for CoMP transmission, namely multi-base station cooperative provides the situation of communication service for subscriber equipment.

And the channel condition information H of user both can be the channel condition information of carrier wave, it is also possible to be the channel condition information of Resource Block RB, it is also possible to be the channel condition information of subband.

The present invention, by little yardstick channel condition information is weighted process, reduces error channel element quantified based on planisphere, improves the data rate of user. In order to verify the gain that user performance is improved, the scheme of existing scheme and the embodiment of the present invention is emulated and analyzed, wherein:

${\mathrm{\&alpha;}}_1=f_1(H^{\&prime;},r_n)=\left|H^{\&prime;}\right|\&CenterDot;\sqrt{N}/\sqrt{\left(\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}{r}_n^2\right)\&CenterDot;N_R\&CenterDot;N_T}$

Planisphere Average Element energy is 1.

Other emulation are provided that hypothesis user carries out cooperative multipoint transmission, and cooperative base station number is 3, and other simulation parameter is as follows.

Carrier frequency: 2GHz

Cell layout: 19 hexagonal cell, sector, every community 3

Antenna for base station: 70 degree, sector beam angle of inclination is 15 degree

Base station spacing: 500m

The relevant path loss of distance: 128.1+37.6log10 (r) dB

Penetration loss: 20dB

Shadow fading standard deviation: 8dB

Shade degree of association: minizone is be 1.0 in 0.5/ community

Spatial correlation between antenna: uncorrelated

Base station/user equipment antenna number: 4/1

CQI feedback: desirable

Modulation and Coding Scheme collection: QPSK (R=1/8,1/6,1/5,1/4,1/3,1/2,3/5,2/3,3/4,5/6) 16QAM (R=1/2,3/5,2/3,3/4,5/6) 64QAM (R=3/5,2/3,3/4,4/5)

Simulation result under above-mentioned simulated conditions is as shown in the table.

From above simulation result it appeared that, although first embodiment and the second embodiment are relative to perfect condition, and its data rate is unable to reach ideal value, but relative to the method for prior art, data rate all improves. The present invention Average Element power by the little yardstick channel condition information of normalization, reduces error channel element quantified based on planisphere, improves the data rate of user.

The above is only the preferred embodiment of the present invention, it is noted that for those skilled in the art, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications,

These improvements and modifications also should be regarded as protection scope of the present invention.

Claims (20)

1. a subscriber equipment, it is characterised in that including:

First wireless communication module;

First extraction module, is used for extracting little yardstick channel condition information;

Weighting block, processes for utilizing the weighted factor relevant to planisphere and little yardstick channel condition information that little yardstick channel condition information is weighted, obtains the little yardstick channel condition information after weighting;

First quantization modules, is used for utilizing planisphere, each element of the little yardstick channel condition information after weighting is carried out quantification treatment, obtains channel direction information CDI;

Second extraction module, is used for extracting large scale channel condition information;

Second quantization modules, obtains channel quality information CQI for the product of large scale channel condition information Yu weighter factor is carried out quantization;

Feedback module, is used for utilizing described first wireless communication module to base station feedback channel direction information CDI and channel quality information CQI, for base station reconfiguration channel, to carry out downlink transfer process.

2. subscriber equipment according to claim 1, it is characterised in that described weighter factor is:

$\left|H^{\&prime;}\right|\&CenterDot;\sqrt{N}/\sqrt{\left(\underset{n=1}{\overset{N}{\&Sigma;}}{r}_n^2\right)\&CenterDot;N_R\&CenterDot;N_T}$

Wherein:

N_TFor the number of base station transmission antenna, N_RNumber for subscriber equipment reception antenna;

h��_ijRepresent from jth transmission antenna to the channel condition information of i-th reception antenna, wherein i=1 ..., N_R, j=1 ..., N_T, r_nFor constellation radius of graph, N is the radius number of the constellation point of planisphere.

3. subscriber equipment according to claim 2, it is characterised in that when the Average Element energy of described planisphere is 1, described weighter factor is:

$\left|H^{\&prime;}\right|/\sqrt{N_R\&CenterDot;N_T}.$

4. subscriber equipment according to claim 1, it is characterised in that described weighter factor is:

$\left|H^{\&prime;}\right|\&CenterDot;N/\&lsqb;\left(\underset{n=1}{\overset{N}{\&Sigma;}}{r}_n\right)\&CenterDot;\sqrt{N_R\&CenterDot;N_T}\&rsqb;$

Wherein, N_TFor the number of base station transmission antenna, N_RNumber for subscriber equipment reception antenna;

h��_ijRepresent from jth transmission antenna to the channel condition information of i-th reception antenna, wherein i=1 ..., N_R, j=1 ..., N_T, r_nFor constellation radius of graph, N is the radius number of the constellation point of planisphere.

5. a subscriber equipment, it is characterised in that including:

First wireless communication module;

First extraction module, is used for extracting little yardstick channel condition information;

Weighting block, processes for utilizing the weighted factor relevant to planisphere and little yardstick channel condition information that little yardstick channel condition information is weighted, obtains the little yardstick channel condition information after weighting;

First quantization modules, is used for utilizing planisphere, each element of the little yardstick channel condition information after weighting is carried out quantification treatment, obtains channel direction information CDI;

Second extraction module, is used for extracting large scale channel condition information;

3rd quantization modules, obtains channel quality information CQI for the product of large scale channel condition information Yu the mould of little yardstick channel condition information is carried out quantization;

Feedback module, is used for utilizing described first wireless communication module to base station feedback channel direction information and channel quality information, for base station reconfiguration channel, to carry out downlink transfer process;

The channel of base station reconfiguration is:

$\hat{H}=CQI\&CenterDot;\stackrel{\&OverBar;}{CDI}$

Wherein:

$\stackrel{\&OverBar;}{CDI}={\hat{H}}^{\&prime;}/\left|{\hat{H}}^{\&prime;}\right|$

DescribedDescribed CDI reconstruct is utilized to obtain.

6. subscriber equipment according to claim 5, it is characterised in that described weighter factor is:

$\left|H^{\&prime;}\right|\&CenterDot;\sqrt{N}/\sqrt{\left(\underset{n=1}{\overset{N}{\&Sigma;}}{r}_n^2\right)\&CenterDot;N_R\&CenterDot;N_T}$

Wherein:

N_TFor the number of base station transmission antenna, N_RNumber for subscriber equipment reception antenna;

h��_ijRepresent from jth transmission antenna to the channel condition information of i-th reception antenna, wherein i=1 ..., N_R, j=1 ..., N_T, r_nFor constellation radius of graph, N is the radius number of the constellation point of planisphere.

7. subscriber equipment according to claim 6, it is characterised in that when the Average Element energy of described planisphere is 1, described weighter factor is:

$\left|H^{\&prime;}\right|/\sqrt{N_R\&CenterDot;N_T}.$

8. subscriber equipment according to claim 5, it is characterised in that described weighter factor is:

$\left|H^{\&prime;}\right|\&CenterDot;N/\&lsqb;\left(\underset{n=1}{\overset{N}{\&Sigma;}}{r}_n\right)\&CenterDot;\sqrt{N_R\&CenterDot;N_T}\&rsqb;$

Wherein, N_TFor the number of base station transmission antenna, N_RNumber for subscriber equipment reception antenna;

h��_ijRepresent from jth transmission antenna to the channel condition information of i-th reception antenna, wherein i=1 ..., N_R, j=1 ..., N_T, r_nFor constellation radius of graph, N is the radius number of the constellation point of planisphere.

9. a base station, it is characterised in that including:

Second wireless communication module;

Receiver module, for receiving the channel direction information CDI and channel quality information CQI of subscriber equipment feedback by the second wireless communication module;

Reconstructed module, is used for reconstructing channel as follows:

$\hat{H}=CQI\&CenterDot;\stackrel{\&OverBar;}{CDI}$

Wherein:

$\stackrel{\&OverBar;}{CDI}={\hat{H}}^{\&prime;}/\left|{\hat{H}}^{\&prime;}\right|$

DescribedThe matrix obtained for utilizing described CDI to reconstruct;

Described CDI is that subscriber equipment utilizes planisphere, each element of the little yardstick channel condition information after weighting being carried out quantification treatment obtain, the little yardstick channel condition information after described weighting is that subscriber equipment utilizes weighter factor that little yardstick channel condition information is weighted process to obtain;

Described CQI is that the product to large scale channel condition information Yu the mould of little yardstick channel condition information carries out quantization and obtains.

10. base station according to claim 9, it is characterised in that described weighter factor is:

$\left|H^{\&prime;}\right|\&CenterDot;\sqrt{N}/\sqrt{\left(\underset{n=1}{\overset{N}{\&Sigma;}}{r}_n^2\right)\&CenterDot;N_R\&CenterDot;N_T}$

Wherein:

N_TFor the number of base station transmission antenna, N_RNumber for subscriber equipment reception antenna;

h��_ijRepresent from jth transmission antenna to the channel condition information of i-th reception antenna, wherein i=1 ..., N_R, j=1 ..., N_T, r_nFor constellation radius of graph, N is the radius number of the constellation point of planisphere.

11. base station according to claim 10, it is characterised in that when the Average Element energy of described planisphere is 1, described weighter factor is:

$\left|H^{\&prime;}\right|/\sqrt{N_R\&CenterDot;N_T}.$

12. base station according to claim 9, it is characterised in that described weighter factor is:

$\left|H^{\&prime;}\right|\&CenterDot;N/\&lsqb;\left(\underset{n=1}{\overset{N}{\&Sigma;}}{r}_n\right)\&CenterDot;\sqrt{N_R\&CenterDot;N_T}\&rsqb;$

Wherein, N_TFor the number of base station transmission antenna, N_RNumber for subscriber equipment reception antenna;

h��_ijRepresent from jth transmission antenna to the channel condition information of i-th reception antenna, wherein i=1 ..., N_R, j=1 ..., N_T, r_nFor constellation radius of graph, N is the radius number of the constellation point of planisphere.

13. a channel information feedback method, it is characterised in that including:

Subscriber equipment extracts little yardstick channel condition information;

Subscriber equipment utilizes the weighted factor relevant to planisphere and little yardstick channel condition information to be weighted little yardstick channel condition information processing, and obtains the little yardstick channel condition information after weighting;

Subscriber equipment utilizes planisphere, each element of the little yardstick channel condition information after weighting is carried out quantification treatment, obtains channel direction information CDI;

Subscriber equipment extracts large scale channel condition information;

The product of large scale channel condition information Yu weighter factor is carried out quantization and obtains channel quality information CQI by subscriber equipment;

Subscriber equipment utilizes the first wireless communication module to base station feedback channel direction information CDI and channel quality information CQI, for base station reconfiguration channel, to carry out downlink transfer process.

14. channel information feedback method according to claim 13, it is characterised in that described weighter factor is:

$\left|H^{\&prime;}\right|\&CenterDot;\sqrt{N}/\sqrt{\left(\underset{n=1}{\overset{N}{\&Sigma;}}{r}_n^2\right)\&CenterDot;N_R\&CenterDot;N_T}$

Wherein:

N_TFor the number of base station transmission antenna, N_RNumber for subscriber equipment reception antenna;

h��_ijRepresent from jth transmission antenna to the channel condition information of i-th reception antenna, wherein i=1 ..., N_R, j=1 ..., N_T, r_nFor constellation radius of graph, N is the radius number of the constellation point of planisphere.

15. channel information feedback method according to claim 14, it is characterised in that when the Average Element energy of described planisphere is 1, described weighter factor is:

$\left|H^{\&prime;}\right|/\sqrt{N_R\&CenterDot;N_T}.$

16. channel information feedback method according to claim 13, it is characterised in that described weighter factor is:

$\left|H^{\&prime;}\right|\&CenterDot;N/\&lsqb;\left(\underset{n=1}{\overset{N}{\&Sigma;}}{r}_n\right)\&CenterDot;\sqrt{N_R\&CenterDot;N_T}\&rsqb;$

Wherein, N_TFor the number of base station transmission antenna, N_RNumber for subscriber equipment reception antenna;

h��_ijRepresent from jth transmission antenna to the channel condition information of i-th reception antenna, wherein i=1 ..., N_R, j=1 ..., N_T, r_nFor constellation radius of graph, N is the radius number of the constellation point of planisphere.

17. a channel information feedback method, it is characterised in that including:

Subscriber equipment extracts little yardstick channel condition information;

Subscriber equipment, for utilizing the weighted factor relevant to planisphere and little yardstick channel condition information to be weighted little yardstick channel condition information processing, obtains the little yardstick channel condition information after weighting;

Subscriber equipment utilizes planisphere, each element of the little yardstick channel condition information after weighting is carried out quantification treatment, obtains channel direction information CDI;

Subscriber equipment extracts large scale channel condition information;

The product of large scale channel condition information Yu the mould of little yardstick channel condition information is carried out quantization and obtains channel quality information CQI by subscriber equipment;

Subscriber equipment utilizes the first wireless communication module to base station feedback channel direction information and channel quality information, for base station reconfiguration channel, to carry out downlink transfer process;

The channel of base station reconfiguration is as follows:

$\hat{H}=CQI\&CenterDot;\stackrel{\&OverBar;}{CDI}$

Wherein:

$\stackrel{\&OverBar;}{CDI}={\hat{H}}^{\&prime;}/\left|{\hat{H}}^{\&prime;}\right|$

DescribedDescribed CDI reconstruct is utilized to obtain.

18. channel information feedback method according to claim 17, it is characterised in that described weighter factor is:

$\left|H^{\&prime;}\right|\&CenterDot;\sqrt{N}/\sqrt{\left(\underset{n=1}{\overset{N}{\&Sigma;}}{r}_n^2\right)\&CenterDot;N_R\&CenterDot;N_T}$

Wherein:

N_TFor the number of base station transmission antenna, N_RNumber for subscriber equipment reception antenna;

h��_ijRepresent from jth transmission antenna to the channel condition information of i-th reception antenna, wherein i=1 ..., N_R, j=1 ..., N_T, r_nFor constellation radius of graph, N is the radius number of the constellation point of planisphere.

19. channel information feedback method according to claim 18, it is characterised in that when the Average Element energy of described planisphere is 1, described weighter factor is:

$\left|H^{\&prime;}\right|/\sqrt{N_R\&CenterDot;N_T}.$

20. channel information feedback method according to claim 17, it is characterised in that described weighter factor is:

$\left|H^{\&prime;}\right|\&CenterDot;N/\&lsqb;\left(\underset{n=1}{\overset{N}{\&Sigma;}}{r}_n\right)\&CenterDot;\sqrt{N_R\&CenterDot;N_T}\&rsqb;$

Wherein, N_TFor the number of base station transmission antenna, N_RNumber for subscriber equipment reception antenna;

h��_ijRepresent from jth transmission antenna to the channel condition information of i-th reception antenna, wherein i=1 ..., N_R, j=1 ..., N_T, r_nFor constellation radius of graph, N is the radius number of the constellation point of planisphere.