CN102237950A - User equipment, base station and channel information feedback method - Google Patents

Abstract

The invention provides user equipment, a base station and a channel information feedback method. The user equipment comprises a first wireless communication module, a first extracting module, a weighting module, a first quantizing module, a second extracting module, a second quantizing module and a feedback module, wherein the first extracting module is used for extracting small-sized channel quality information (CQI); the weighting module is used for weighting the small-sized CQI by using a weighting factor alpha relevant to a constellation diagram and the small-sized CQI to obtain weighted small-sized CQI; the first quantizing module is used for quantizing every element of the weighted small-sized CQI by using the constellation diagram to obtain CDI (Channel Direction Information); the second extracting module is used for extracting large-sized CQI; the second quantizing module is used for quantizing an arithmetic product of the large-sized CQI and the weighting factor to obtain CQI; and the feedback module is used for feeding back the CDI and the CQI to the base station by using the first wireless communication module for the base station to reconstruct a channel for performing downlink transmission processing. According to the invention, the data rate of a user is increased.

Description

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

Technical field

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

Background technology

In Frequency Division Duplexing (FDD) multiplex system (FDD), the user need feed back to the base station end with the form of CDI (channel directional information) and CQI (channel quality information) with channel condition information, the CDI and the CQI reconstruct channel of base station end utilization feedback carry out method such as precoding again and carry out downlink transfer according to the channel of reconstruct.

In many antennas mimo system, the user need feed back the channel condition information of a base station; Wherein each state information comprises large scale channel condition information and small scale channel condition information.The large scale channel condition information is mainly by the decision of the relative position of user and base station, and the small scale channel condition information then characterizes the decline situation between base station and user's the antenna, and it is 0 that each element wherein all satisfies average, and variance is 1 multiple Gaussian random variable.And in coordinate multipoint (CoMP) system, the user need feed back a plurality of channel condition informations of a plurality of base stations.

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

Figure 1 shows that the schematic diagram of 4bits planisphere.

In conjunction with shown in Figure 1, utilizing planisphere to carry out feedback of channel information mainly is to utilize each small scale element of planisphere quantized channel state information as shown in Figure 1.

It is 0 that each element of small scale channel condition information satisfies average, and variance is 1 multiple Gaussian random variable.Utilize planisphere to quantize small scale channel condition information element.

As shown in Figure 2, this method handling process comprises:

Step 21, subscriber equipment extracts the small scale channel condition information;

Step 22, subscriber equipment utilize planisphere that each small scale channel condition information element is quantized to obtain CDI;

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

Step 24, subscriber equipment quantizes to obtain CQI to the large scale channel condition information.

Step 25, subscriber equipment feedback CQI and CDI utilize CQI and the CDI reconstruct channel that feeds back for the base station, handle to carry out downlink transfer.

Yet the inventor finds that there are the following problems at least for prior art in the process that realizes the embodiment of the invention:

Though it is 0 that each element of small scale channel condition information satisfies average from the statistical significance, variance is 1 multiple Gaussian random variable, and each small scale channel condition information that produces at random has bigger fluctuation.Under these circumstances, utilize planisphere to quantize to produce higher quantization error, cause systematic function to descend.

Summary of the invention

The purpose of this invention is to provide a kind of subscriber equipment, base station and channel information feedback method, improve the system throughput performance.

To achieve these goals, the embodiment of the invention provides a kind of subscriber equipment, comprising:

First wireless communication module;

First extraction module is used to extract the small scale channel condition information;

Weighting block is used to utilize the weighted factor relevant with the small scale channel condition information with planisphere that the small scale channel condition information is weighted processing, obtains the small scale channel condition information after the weighting;

First quantization modules is used to utilize planisphere, and each element of the small scale channel condition information after the weighting is carried out quantification treatment, obtains channel directional information CDI;

Second extraction module is used to extract the large scale channel condition information;

Second quantization modules is used for the product of large scale channel condition information and weighted factor is quantized to obtain channel quality information CQI;

Feedback module is used to utilize described first wireless communication module to base station feedback channel directional information CDI and channel quality information CQI, for the base station reconfiguration channel, handles to carry out downlink transfer.

To achieve these goals, the embodiment of the invention also provides a kind of subscriber equipment, comprising:

First wireless communication module;

First extraction module is used to extract the small scale channel condition information.

Weighting block is used to utilize the weighted factor relevant with the small scale channel condition information with planisphere that the small scale channel condition information is weighted processing, obtains the small scale channel condition information after the weighting;

First quantization modules is used to utilize planisphere, and each element of the small scale channel condition information after the weighting is carried out quantification treatment, obtains channel directional information CDI;

Second extraction module is used to extract the large scale channel condition information;

The 3rd quantization modules is used for the product of the mould of large scale channel condition information and small scale channel condition information is quantized to obtain channel quality information CQI;

Feedback module is used to utilize described first wireless communication module to base station feedback channel directional information and channel quality information, for the base station reconfiguration channel, handles to carry out downlink transfer;

The channel of base station reconfiguration is

Wherein:

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

Described Utilize described CDI reconstruct to obtain.

To achieve these goals, the embodiment of the invention also provides a kind of base station, comprising:

Second wireless communication module;

Receiver module is used for receiving CDI and the CQI that subscriber equipment feeds back by second wireless communication module;

Reconstructed module is used for the reconstruct channel:

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

Wherein:

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

Described

Be the matrix that utilizes described CDI reconstruct to obtain;

Described CDI is that subscriber equipment utilizes planisphere, the element of the channel condition information after each weighting is carried out quantification treatment obtain, the channel condition information after the described weighting is that subscriber equipment utilizes weighted factor that the small scale channel condition information is weighted to handle to obtain;

Described CQI quantizes to obtain for the product to the mould of large scale channel condition information and small scale channel condition information.

To achieve these goals, the embodiment of the invention also provides a kind of channel information feedback method, comprising:

Subscriber equipment extracts the small scale channel condition information.

The weighted factor that the subscriber equipment utilization is relevant with the small scale channel condition information with planisphere is weighted processing to the small scale channel condition information, obtains the small scale channel condition information after the weighting;

Subscriber equipment utilizes planisphere, and each element of the small scale channel condition information after the weighting is carried out quantification treatment, obtains channel directional information CDI;

Subscriber equipment extracts the large scale channel condition information;

Subscriber equipment quantizes to obtain channel quality information CQI to the product of large scale channel condition information and weighted factor;

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

To achieve these goals, the embodiment of the invention also provides a kind of channel information feedback method, comprising:

Subscriber equipment extracts the small scale channel condition information.

The weighted factor that utilization is relevant with the small scale channel condition information with planisphere is weighted processing to the small scale channel condition information, obtains the small scale channel condition information after the weighting;

Subscriber equipment utilizes planisphere, and each element of the small scale channel condition information after the weighting is carried out quantification treatment, obtains channel directional information CDI;

Subscriber equipment extracts the large scale channel condition information;

Subscriber equipment quantizes to obtain channel quality information CQI to the product of the mould of large scale channel condition information and small scale channel condition information;

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

The channel of base station reconfiguration is

Wherein:

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

Described Utilize described CDI reconstruct to obtain.

Described weighted 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 _TBe the number of base station transmitting antenna, N _RNumber for the subscriber equipment reception antenna;

h _Ij', i=1 ..., N _R, j=1 ..., N _TThe channel condition information of expression from j transmitting antenna to i reception antenna, r _nBe the constellation radius of graph, N is the radius number of the constellation point of planisphere.

The average element energy of described planisphere is 1 o'clock, and first kind of weighted factor can be reduced to as follows:

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

The embodiment of the invention has following beneficial effect:

The present invention passes through the small scale channel condition information after the quantification weighting, has reduced based on the error of planisphere to the channel element quantification, has promoted user's data speed.

Description of drawings

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

Fig. 2 is the existing schematic flow sheet that utilizes planisphere to carry out 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.

Embodiment

Before the embodiment of the invention is elaborated, earlier some parameters and the notion that may relate to limited, so that better understand the present invention.

Suppose certain base station to user's channel condition information H=lH ', wherein l represents that the base station arrives user's large-scale channel information, comprising path loss, shadow fading and antenna gain.

And the small scale channel condition information is as follows:

Wherein, N _TBe the number of base station transmitting antenna, N _RBe the number of subscriber equipment reception antenna, h _Ij', i=1 ..., N _R, j=1 ..., N _TThe channel condition information of expression from j transmitting antenna to i reception antenna.

The method of first embodiment of the invention comprises as shown in Figure 3:

Step 31, subscriber equipment are extracted small scale channel condition information H '.

Step 32, the weighted factor that the subscriber equipment utilization is relevant with the small scale channel condition information with planisphere is weighted processing to the small scale channel condition information, obtains the small scale channel condition information after the weighting.

Step 33, subscriber equipment utilizes planisphere, to each element of the small scale channel condition information after the weighting

Carry out quantification treatment, obtain CDI.

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

Step 35, subscriber equipment quantizes to obtain CQI to l α.

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

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

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

First wireless communication module;

First extraction module is used to extract small scale channel condition information H '.

Weighting block is used to utilize the weighted factor relevant with the small scale channel condition information with planisphere that the small scale channel condition information is weighted processing, obtains the small scale channel condition information after the weighting.

First quantization modules is used to utilize planisphere, to each element of the small scale channel condition information after the weighting

Carry out quantification treatment, obtain CDI.

Second extraction module is used to extract large scale channel condition information l.

Second quantization modules is used for l α is quantized to obtain CQI.

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

In the first embodiment of the present invention, the following detailed description of this weighted factor.

＜mode one 〉

${\mathrm{\α}}_1=f_1(H^{\′},r_n)=|H^{\′}|\·\sqrt{N}/\sqrt{\left(\underset{n=1}{\overset{N}{\mathrm{\Σ}}}{r}_n^2\right)\·N_R\·N_T}$

Wherein, r _nBe the constellation radius of graph, n=1,2 ..., N, N is the radius number of the constellation point of planisphere, as shown in Figure 1, this planisphere comprises 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 weighted factor, the small scale channel condition information after the weighting

As follows:

$\stackrel{\‾}{H}=H^{\′}/{\mathrm{\α}}_1$

For the planisphere that average element energy is 1, above-mentioned weighted is equivalent to normalized, the small scale channel condition information behind the normalization channel

Average element energy be 1.

For the planisphere that average element energy is 1, following equation is set up:

$N=\underset{n=1}{\overset{N}{\mathrm{\Σ}}}{r}_n^2$

So above-mentioned weighted factor can be reduced to:

${\mathrm{\α}}_1=\left|H^{\′}\right|/\sqrt{N_R\·N_T}$

＜mode two 〉

${\mathrm{\α}}_2=f_2(H^{\′},r_n)=\left|H^{\′}\right|\·N/[\left(\underset{n=1}{\overset{N}{\mathrm{\Σ}}}{r}_n\right)\·\sqrt{N_R\·N_T}]$

Wherein, r _nBe the constellation radius of graph, n=1,2 ..., N, N is the radius number of the constellation point of planisphere, as shown in Figure 1, this planisphere comprises 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 weighted factor under the second way, the small scale channel condition information after the weighting

As follows:

$\stackrel{\‾}{H}=H^{\′}/{\mathrm{\α}}_2$

After the above-mentioned weighted, the small scale channel condition information after the weighted

The energy of the average element energy element average amplitude that is planisphere.

Above-mentionedly only enumerated two kinds of possible weighting schemes, but should be understood that, other weighting schemes that can reduce the error that channel element is quantized based on planisphere also can be used for the embodiment of the invention, do not enumerate one by one at this.

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

Step 41, subscriber equipment are extracted small scale channel condition information H '.

Step 42, the weighted factor that the subscriber equipment utilization is relevant with the small scale channel condition information with planisphere is weighted processing to the small scale channel condition information, obtains the small scale channel condition information after the weighting.

Step 43, subscriber equipment utilizes planisphere, to each element of the small scale channel condition information after the weighting

Carry out quantification treatment, obtain CDI.

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

Step 45, subscriber equipment is to l|H ' | quantize to obtain CQI.

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

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

Wherein:

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

Described

Be the matrix that utilizes described CDI reconstruct to obtain.

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

First wireless communication module;

First extraction module is used to extract small scale channel condition information H '.

Weighting block is used to utilize the weighted factor relevant with the small scale channel condition information with planisphere that the small scale channel condition information is weighted processing, obtains the small scale channel condition information after the weighting.

First quantization modules is used to utilize planisphere, to each element of the small scale channel condition information after the weighting

Carry out quantification treatment, obtain CDI.

Second extraction module is used to extract large scale channel condition information l.

The 3rd quantization modules is used for l|H ' | quantize to obtain CQI.

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

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

Wherein:

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

Described Be the matrix that utilizes described CDI reconstruct to obtain.

The base station of the embodiment of the invention comprises:

Second wireless communication module;

Receiver module is used for receiving CDI and the CQI that subscriber equipment feeds back by second wireless communication module;

Reconstructed module, it is as follows to be used for the reconstruct channel:

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

Wherein:

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

Described Be the matrix that utilizes described CDI reconstruct to obtain;

Communications Processor Module utilizes reconstruct channel downlink transfer to handle.

In the first embodiment of the present invention, the following detailed description of this weighted factor.

＜mode one 〉

${\mathrm{\α}}_1=f_1(H^{\′},r_n)=\left|H^{\′}\right|\·\sqrt{N}/\sqrt{\left(\underset{n=1}{\overset{N}{\mathrm{\Σ}}}{r}_n^2\right)\·N_R\·N_T}$

Wherein, r _nBe the constellation radius of graph, n=1,2 ..., N, N is the radius number of the constellation point of planisphere, as shown in Figure 1, this planisphere comprises 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 weighted factor, the small scale channel condition information after the weighting As follows:

$\stackrel{\‾}{H}=H^{\′}/{\mathrm{\α}}_1$

For the planisphere that average element energy is 1, above-mentioned weighted is equivalent to normalized, the small scale channel condition information behind the normalization channel

Average element energy be 1.

For the planisphere that average element energy is 1, following equation is set up:

$N=\underset{n=1}{\overset{N}{\mathrm{\Σ}}}{r}_n^2$

So above-mentioned weighted factor can be reduced to:

${\mathrm{\α}}_1=\left|H^{\′}\right|/\sqrt{N_R\·N_T}$

＜mode two 〉

${\mathrm{\α}}_2=f_2(H^{\′},r_n)=\left|H^{\′}\right|\·N/[\left(\underset{n=1}{\overset{N}{\mathrm{\Σ}}}{r}_n\right)\·\sqrt{N_R\·N_T}]$

Wherein, r _nBe the constellation radius of graph, n=1,2 ..., N, N is the radius number of the constellation point of planisphere, as shown in Figure 1, this planisphere comprises 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 weighted factor under the second way, the small scale channel condition information after the weighting

As follows:

$\stackrel{\‾}{H}=H^{\′}/{\mathrm{\α}}_2$

After the above-mentioned weighted, the small scale channel condition information after the weighted

The energy of the average element energy element average amplitude that is planisphere.

Should be understood that said method can be used for the MIMO transmission between single-user equipment and the single base station, also can be used for the CoMP transmission, promptly multi-base station cooperative provides the situation of communication service for subscriber equipment.

And user's channel condition information H both can be the channel condition information of carrier wave, also can be the channel condition information of Resource Block RB, can also be the channel condition information of subband.

The present invention has reduced based on the error of planisphere to the channel element quantification by the small scale channel condition information is weighted processing, has promoted user's data speed.For the gain of verifying that user performance is improved, the scheme of the existing scheme and the embodiment of the invention has been carried out emulation and analysis, wherein:

${\mathrm{\α}}_1=f_1(H^{\′},r_n)=\left|H^{\′}\right|\·\sqrt{N}/\sqrt{\left(\underset{n=1}{\overset{N}{\mathrm{\Σ}}}{r}_n^2\right)\·N_R\·N_T}$

The average element energy of planisphere is 1.

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

Carrier frequency: 2GHz

Cell layout: 19 hexagonal cell, 3 sectors, every sub-district

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

Base station spacing: 500m

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

Penetration loss: 20dB

Shadow fading standard deviation: 8dB

The shade degree of correlation: the minizone is to be 1.0 in 0.5/ sub-district

Spatial correlation between antenna: uncorrelated

Base station/user equipment antenna number: 4/1

CQI feedback: ideal

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

Can find from above simulation result, though first embodiment and second embodiment with respect to perfect condition, its data rate can't reach ideal value, with respect to the method for prior art, data rate all improves.The present invention has reduced based on the error of planisphere to the channel element quantification by the average element power of normalization small scale channel condition information, has promoted user's data speed.

The above only is a preferred implementation of the present invention, should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications,

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

Claims (20)

1. a subscriber equipment is characterized in that, comprising:

First wireless communication module;

First extraction module is used to extract the small scale channel condition information;

Weighting block is used to utilize the weighted factor relevant with the small scale channel condition information with planisphere that the small scale channel condition information is weighted processing, obtains the small scale channel condition information after the weighting;

First quantization modules is used to utilize planisphere, and each element of the small scale channel condition information after the weighting is carried out quantification treatment, obtains channel directional information CDI;

Second extraction module is used to extract the large scale channel condition information;

Second quantization modules is used for the product of large scale channel condition information and weighted factor is quantized to obtain channel quality information CQI;

Feedback module is used to utilize described first wireless communication module to base station feedback channel directional information CDI and channel quality information CQI, for the base station reconfiguration channel, handles to carry out downlink transfer.

2. subscriber equipment according to claim 1 is characterized in that, described weighted factor is:

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

Wherein:

N _TBe the number of base station transmitting antenna, N _RNumber for the subscriber equipment reception antenna;

h _Ij', i=1 ..., N _R, j=1 ..., N _TThe channel condition information of expression from j transmitting antenna to i reception antenna, r _nBe the constellation radius of graph, N is the radius number of the constellation point of planisphere.

3. subscriber equipment according to claim 2 is characterized in that, the average element energy of described planisphere is 1 o'clock, and described weighted factor is:

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

4. subscriber equipment according to claim 1 is characterized in that, described weighted factor is:

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

Wherein, N _TBe the number of base station transmitting antenna, N _RNumber for the subscriber equipment reception antenna;

h _Ij', i=1 ..., N _R, j=1 ..., N _TThe channel condition information of expression from j transmitting antenna to i reception antenna;

r _nBe the constellation radius of graph, N is the radius number of the constellation point of planisphere.

5. a subscriber equipment is characterized in that, comprising:

First wireless communication module;

First extraction module is used to extract the small scale channel condition information;

Weighting block is used to utilize the weighted factor relevant with the small scale channel condition information with planisphere that the small scale channel condition information is weighted processing, obtains the small scale channel condition information after the weighting;

First quantization modules is used to utilize planisphere, and each element of the small scale channel condition information after the weighting is carried out quantification treatment, obtains channel directional information CDI;

Second extraction module is used to extract the large scale channel condition information;

The 3rd quantization modules is used for the product of the mould of large scale channel condition information and small scale channel condition information is quantized to obtain channel quality information CQI;

Feedback module is used to utilize described first wireless communication module to base station feedback channel directional information and channel quality information, for the base station reconfiguration channel, handles to carry out downlink transfer;

The channel of base station reconfiguration is:

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

Wherein:

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

Described

Utilize described CDI reconstruct to obtain.

6. subscriber equipment according to claim 5 is characterized in that, described weighted factor is:

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

Wherein:

N _TBe the number of base station transmitting antenna, N _RNumber for the subscriber equipment reception antenna;

h _Ij', i=1 ..., N _R, j=1 ..., N _TThe channel condition information of expression from j transmitting antenna to i reception antenna;

r _nBe the constellation radius of graph, N is the radius number of the constellation point of planisphere.

7. subscriber equipment according to claim 6 is characterized in that, the average element energy of described planisphere is 1 o'clock, and described weighted factor is:

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

8. subscriber equipment according to claim 5 is characterized in that, described weighted factor is:

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

Wherein, N _TBe the number of base station transmitting antenna, N _RNumber for the subscriber equipment reception antenna;

h _Ij', i=1 ..., N _R, j=1 ..., N _TThe channel condition information of expression from j transmitting antenna to i reception antenna;

r _nBe the constellation radius of graph, N is the radius number of the constellation point of planisphere.

9. a base station is characterized in that, comprising:

Second wireless communication module;

Receiver module is used for receiving channel directional information CDI and the channel quality information CQI that subscriber equipment feeds back by second wireless communication module;

Reconstructed module, it is as follows to be used for the reconstruct channel:

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

Wherein:

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

Described

Be the matrix that utilizes described CDI reconstruct to obtain;

Described CDI is that subscriber equipment utilizes planisphere, each element of small scale channel condition information after the weighting is carried out quantification treatment obtain, the small scale channel condition information after the described weighting is that subscriber equipment utilizes weighted factor that the small scale channel condition information is weighted to handle to obtain;

Described CQI quantizes to obtain for the product to the mould of large scale channel condition information and small scale channel condition information.

10. base station according to claim 9 is characterized in that, described weighted factor is:

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

Wherein:

N _TBe the number of base station transmitting antenna, N _RNumber for the subscriber equipment reception antenna;

h _Ij', i=1 .., N _R, j=1 ..., N _TThe channel condition information of expression from j transmitting antenna to i reception antenna;

r _nBe the constellation radius of graph, N is the radius number of the constellation point of planisphere.

11. base station according to claim 10 is characterized in that, the average element energy of described planisphere is 1 o'clock, and described weighted factor is:

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

12. base station according to claim 9 is characterized in that, described weighted factor is:

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

Wherein, N _TBe the number of base station transmitting antenna, N _RNumber for the subscriber equipment reception antenna;

h _Ij', i=1 ..., N _R, j=1 ..., N _TThe channel condition information of expression from j transmitting antenna to i reception antenna;

r _nBe the constellation radius of graph, N is the radius number of the constellation point of planisphere.

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

Subscriber equipment extracts the small scale channel condition information;

The weighted factor that the subscriber equipment utilization is relevant with the small scale channel condition information with planisphere is weighted processing to the small scale channel condition information, obtains the small scale channel condition information after the weighting;

Subscriber equipment utilizes planisphere, and each element of the small scale channel condition information after the weighting is carried out quantification treatment, obtains channel directional information CDI;

Subscriber equipment extracts the large scale channel condition information;

Subscriber equipment quantizes to obtain channel quality information CQI to the product of large scale channel condition information and weighted factor;

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

14. channel information feedback method according to claim 13 is characterized in that, described weighted factor is:

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

Wherein:

N _TBe the number of base station transmitting antenna, N _RNumber for the subscriber equipment reception antenna;

h _Ij', i=1 ..., N _R, j=1 ..., N _TThe channel condition information of expression from j transmitting antenna to i reception antenna;

r _nBe the constellation radius of graph, N is the radius number of the constellation point of planisphere.

15. channel information feedback method according to claim 14 is characterized in that, the average element energy of described planisphere is 1 o'clock, and described weighted factor is:

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

16. channel information feedback method according to claim 13 is characterized in that, described weighted factor is:

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

Wherein, N _TBe the number of base station transmitting antenna, N _RNumber for the subscriber equipment reception antenna;

h _Ij', i=1 ..., N _R, j=1 ..., N _TThe channel condition information of expression from j transmitting antenna to i reception antenna;

r _nBe the constellation radius of graph, N is the radius number of the constellation point of planisphere.

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

Subscriber equipment extracts the small scale channel condition information;

Subscriber equipment is used to utilize the weighted factor relevant with the small scale channel condition information with planisphere that the small scale channel condition information is weighted processing, obtains the small scale channel condition information after the weighting;

Subscriber equipment utilizes planisphere, and each element of the small scale channel condition information after the weighting is carried out quantification treatment, obtains channel directional information CDI;

Subscriber equipment extracts the large scale channel condition information;

Subscriber equipment quantizes to obtain channel quality information CQI to the product of the mould of large scale channel condition information and small scale channel condition information;

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

The channel of base station reconfiguration is as follows:

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

Wherein:

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

Described

Utilize described CDI reconstruct to obtain.

18. channel information feedback method according to claim 17 is characterized in that, described weighted factor is:

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

Wherein:

N _TBe the number of base station transmitting antenna, N _RNumber for the subscriber equipment reception antenna;

h _Ij', i=1 ..., N _R, j=1 ..., N _TThe channel condition information of expression from j transmitting antenna to i reception antenna;

r _nBe the constellation radius of graph, N is the radius number of the constellation point of planisphere.

19. channel information feedback method according to claim 18 is characterized in that, the average element energy of described planisphere is 1 o'clock, and described weighted factor is:

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

20. channel information feedback method according to claim 17 is characterized in that, described weighted factor is:

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

Wherein, N _TBe the number of base station transmitting antenna, N _RNumber for the subscriber equipment reception antenna;

h _Ij', i=1 ..., N _R, j=1 ..., N _TThe channel condition information of expression from j transmitting antenna to i reception antenna;

r _nBe the constellation radius of graph, N is the radius number of the constellation point of planisphere.

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