CN1534897A - Method of antenna array transmitting signal to downward special channel in FDD system and device - Google Patents

Abstract

A method and equipment for emitting signals from the antenna array to dedicated down channel in FDD system are disclosed. Said method includes using the space correlated array R obtained from up signals to calculate the ampliment weighting value, and performing the amplitude weighting to the weight value of wave beams to be transmitted to the dedicated down channel. It can prevent the system property from being lowered.

Description

Aerial array is to downlink dedicated channels signal method for transmitting and device in the FDD system

Technical field

The present invention relates to when the fixed beam algorithm in FDD (Frequency Division Dual, Frequency Division Duplexing (FDD)) the wireless communication system use intelligent antenna technology emission of downlink dedicated channels signal.

Background technology

When the FDD wireless communication system uses fixed beam algorithm in the intelligent antenna technology, dedicated channel in descending/forward link is launched at the wave beam interior orientation, Common Pilot Channel is theaomni-directional transmission in whole sub-district, and system uses public guide frequency to do phase reference to carry out channel estimating dedicated channel is carried out demodulation.But the phase place of the phase place of Common Pilot Channel and dedicated channel is inconsistent, separates the phenomenon that just there is phase mismatch in timing, causes systematic function to descend.

Form in the algorithm at existing antenna system downlink wave beam, the descending Common Pilot Channel theaomni-directional transmission in whole sub-district that is used for phase reference, dedicated channel is launched in wave beam, and the beam direction angle θ that is used for the formation of dedicated channel wave beam draws according to certain decision algorithm according to the up beam center angle that estimates multipath.

Suppose that antenna array is an even linear array, the wave beam weight w of downlink dedicated channels signal emission is:

$w=\left[\begin{array}{c}\exp \left(\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A0311621400112.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}\frac{d}{\mathrm{\&lambda;}}(1-m)\cos \mathrm{\&theta;}\right)/\sqrt{N}\\ \exp \left(\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A0311621400112.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}\frac{d}{\mathrm{\&lambda;}}(2-m)\cos \mathrm{\&theta;}\right)/\sqrt{N}\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ \exp \left(\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A0311621400112.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}\frac{d}{\mathrm{\&lambda;}}(i-m)\cos \mathrm{\&theta;}\right)/\sqrt{N}\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ \exp \left(\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A0311621400112.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}\frac{d}{\mathrm{\&lambda;}}(N-m)\cos \mathrm{\&theta;}\right)/\sqrt{N}\end{array}\right],1\&le;i\&le;N$

In the formula, $j=\sqrt{-1},$ D is the array element distance of array, and λ is the carrier frequency wavelength,

Be the array element equivalent separation, N is the array element number of array, and m is array reference array element position.

Prior art is when applying intelligent antenna, after from up link, obtaining the angle of arrival of dedicated channel, descendingly dedicated channel is directly made wave beam form, adopt the Common Pilot Channel of theaomni-directional transmission in the sub-district to make phase reference, thereby cause the phase mismatch of separating timing, cause systematic function to descend.

Summary of the invention

Purpose of the present invention is exactly in order to address the above problem, the present invention proposes the thought that utilization obtains from upward signal in the FDD wireless communication system spatial correlation matrix carries out the downlink wave beam weighting, the dedicated channel response and the correlation of common signal channel response are increased, the problem that the systematic function that phase deviation is brought between downlink dedicated channels and the public guide frequency when making phase reference to solve public guide frequency descends.

The present invention is achieved in that

A kind of aerial array is to downlink dedicated channels signal method for transmitting in the FDD communication system, and described aerial array is made of at least 2 antennas, said method comprising the steps of:

A) obtain spatial correlation matrix R and beam direction angle θ from upward signal;

B) obtain the wave beam weight w=a (θ) that the downlink dedicated channels signal is launched according to the beam direction angle θ in the step a), a (θ) is an array manifold;

C) obtain the amplitude weighting value according to the spatial correlation matrix R in the step a) | R (:, m) |, R (:, the m) m of representation space correlation matrix R row;

D) judge according to wave beam weight w, if the correlation ρ of dedicated channel response and common signal channel response greater than threshold value ρ min and array direction gain G AIN greater than threshold value GAINmin, execution in step f then), otherwise execution in step e);

E) carry out w=w.*|R (:, m) |, operator " .* " expression dot product is got back to step d);

F) wave beam weight w is carried out normalization operation w=norm{w};

G) wave beam weight that the w in the step f) is launched the downlink dedicated channels signal as aerial array carries out the emission of downlink dedicated channels signal.

In step a), utilize upward signal to estimate that the angle spread that obtains spatial correlation matrix R or utilize upward signal to estimate constructs spatial correlation matrix R; Beam direction angle θ draws according to decision algorithm according to the beam center angle that upward signal estimates multipath.

In step a), spatial correlation matrix R=E[hh ^H], wherein E represents to get desired value, and H represents conjugate transpose,

$h=\left[\begin{array}{c}h1\\ \mathrm{<figure-callout\; id="2"\; label="h"\; filenames="A0311621400112.png"\; state="\{\{state\}\}">h</figure-callout>}2\\ \&CenterDot;\&CenterDot;\&CenterDot;\\ h_N\end{array}\right]$

H is a vector channel responses, and expression arrives the channel factors on the aerial array different antennae, the channel factors of channel that signal experiences just, and wherein N represents the element number of array of aerial array.

In step b),

$a\left(\mathrm{\&theta;}\right)=\left[\begin{array}{c}\exp \left(\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A0311621400112.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}\frac{d}{\mathrm{\&lambda;}}(1-m)\cos \mathrm{\&theta;}\right)\\ \exp \left(\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A0311621400112.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}\frac{d}{\mathrm{\&lambda;}}(2-m)\cos \mathrm{\&theta;}\right)\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ \exp \left(\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A0311621400112.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}\frac{d}{\mathrm{\&lambda;}}(i-m)\cos \mathrm{\&theta;}\right)\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ \exp \left(\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A0311621400112.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}\frac{d}{\mathrm{\&lambda;}}(N-m)\cos \mathrm{\&theta;}\right)\end{array}\right]$

Wherein, d is the array element distance of array, and λ is the carrier frequency wavelength, and d/ λ is the array element equivalent separation, and m is array reference array element position, is an array element of getting arbitrarily from aerial array, and N is the array element number of array.

The angle spread that described method is applicable to receiving terminal is greater than 20 ° situation, and the angle spread of described receiving terminal is meant that multipath signal arrives the broadening of the arrival angle of aerial array.

A kind of aerial array is to the device of downlink dedicated channels signal emission in the FDD communication system, and described aerial array is made of at least 2 antennas, comprising:

The upward signal estimation module is used for obtaining spatial correlation matrix R and beam direction angle θ from upward signal, and goes out the wave beam weight w=a (θ) of downlink dedicated channels signal emission according to θ; Described beam direction angle θ draws according to decision algorithm according to the beam center angle that upward signal estimates multipath; Described upward signal estimation module is to estimate to obtain spatial correlation matrix R module or the angle spread estimated by upward signal constructs spatial correlation matrix R from upward signal.

Wave beam amplitude weighting module is used for drawing the amplitude weighting value according to described spatial correlation matrix R | R (:, m) |, R (:, the m) m of representation space correlation matrix R row; And according to described wave beam weight w judgement, if the correlation ρ of dedicated channel response and common signal channel response greater than threshold value ρ min and array direction gain G AIN greater than threshold value GAINmin, then wave beam weight w is carried out normalization operation w=norm{w}, and with the wave beam weight w of the w after the normalization as the emission of downlink dedicated channels signal; Otherwise carry out w=w.*|R (:, m) | computing, operator " .* " expression dot product, and carry out above-mentioned judgement again according to the w after the dot product, so circulation is up to satisfying Rule of judgment, w after the dot product that will circulate for several times again carries out normalization operation w=norm{w}, and with the wave beam weight w of the w after the normalization as the emission of downlink dedicated channels signal; Wave beam weight w and dedicated channel signal are multiplied each other, obtain each dedicated channel signal after the weighting.

Each antenna in the aerial array is launched each dedicated channel signal after the weighting.

The present invention mainly adopts the down beam shaping technology, the thought of promptly utilizing the spatial correlation matrix that obtains from upward signal to carry out the downlink wave beam weighting, the dedicated channel response and the correlation of common signal channel response are increased, to solve applying intelligent antenna fixed beam algorithm in the FDD communication system, descending employing public guide frequency is made phase reference, cause the phase mismatch of separating timing, the problem that causes systematic function to descend.

Description of drawings

Fig. 1 is the weights calculation flow chart that the present invention adopts the wave beam forming technology;

Fig. 2 is the graph of a relation of correlation size and array direction gain;

Fig. 3 is after the application of beam figuration technology and does not have the standard deviation comparison diagram of the phase deviation of application of beam figuration technology;

Fig. 4 is the installation drawing that the present invention adopts the wave beam forming technology.

Embodiment

Below in conjunction with drawings and Examples, the present invention is done concrete introduction:

A kind of aerial array is to downlink dedicated channels signal method for transmitting in the FDD communication system, and described aerial array is made of at least 2 antennas, and described method is seen Fig. 1, and it is the weights calculation flow chart that adopts the wave beam forming technology:

A) obtain spatial correlation matrix R and beam direction angle θ from upward signal, can utilize upward signal to estimate that the angle spread that obtains spatial correlation matrix R or utilize upward signal to estimate constructs spatial correlation matrix R, but the angle spread of utilizing upward signal to estimate constructs the method list of references " Implementation of spatiotemporally correlatedrayleugh fading model for smart model for smart antenna applications " of spatial correlation matrix R, TELECOMMUNICATIONS REVIEW, vol.9, No.2,1999,3-4, P173～P183.

Spatial correlation matrix R=E[hh ^H], wherein E represents to get desired value, and H represents conjugate transpose,

$h=\left[\begin{array}{c}h1\\ \mathrm{<figure-callout\; id="2"\; label="h"\; filenames="A0311621400112.png"\; state="\{\{state\}\}">h</figure-callout>}2\\ \&CenterDot;\&CenterDot;\&CenterDot;\\ h_N\end{array}\right]---\left(1\right)$

H is a vector channel responses, and expression arrives the channel factors on the aerial array different antennae, the channel factors of channel that signal experiences just, and wherein N represents the element number of array of aerial array.

Beam direction angle θ draws according to decision algorithm according to the beam center angle that upward signal estimates multipath, these methods are meant the method at various estimation beam centers angle, for example the fixed beam in the fixed beam method forms, judge the energy value of different beams then, the wave beam at maximum energy value place is exactly the dedicated channel beam direction angle θ that estimation obtains; Certainly also there are a lot of self adaptations to estimate the method for θ, for example MUSIC (MUltiple Signal Classification) method, EM (Expectation-Maximization) method, SAGE (Space-Alternating Generalized EM) method etc.

B) obtain the wave beam weight w=a (θ) that the downlink dedicated channels signal is launched according to the beam direction angle θ in the step a), a (θ) is an array manifold,

$a\left(\mathrm{\&theta;}\right)=\left[\begin{array}{c}\exp \left(\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A0311621400112.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}\frac{d}{\mathrm{\&lambda;}}(1-m)\cos \mathrm{\&theta;}\right)\\ \exp \left(\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A0311621400112.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}\frac{d}{\mathrm{\&lambda;}}(2-m)\cos \mathrm{\&theta;}\right)\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ \exp \left(\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A0311621400112.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}\frac{d}{\mathrm{\&lambda;}}(i-m)\cos \mathrm{\&theta;}\right)\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ \exp \left(\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A0311621400112.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}\frac{d}{\mathrm{\&lambda;}}(N-m)\cos \mathrm{\&theta;}\right)\end{array}\right]---\left(2\right)$

Wherein, d is the array element distance of array, and λ is the carrier frequency wavelength, and d/ λ is the array element equivalent separation, and m is array reference array element position, is an array element of getting arbitrarily from aerial array, and N is the array element number of array.

C) obtain the amplitude weighting value according to the spatial correlation matrix R in the step a) | R (:, m) |, R (:, the m) m of representation space correlation matrix R row;

R (:, m)=E[hh _m ^*], conjugation, h are got in " * " expression _mRepresent on m the antenna, i.e. the channel response that signal experienced on the array reference array element.

D) judge according to wave beam weight w, if the correlation ρ of dedicated channel response and common signal channel response greater than threshold value ρ min and array direction gain G AIN greater than threshold value GAINmin, execution in step f then), otherwise execution in step e);

In an embodiment, the relation of w and correlation ρ and array direction gain G AIN is as follows:

$\mathrm{\&rho;}=\frac{w^H\&CenterDot;R(:,m)}{\sqrt{w^H\&CenterDot;R(:,m)\&CenterDot;w^H}}---\left(3\right)$

GAIN＝|w ^H·a(θ)|??????????????????????(4)

E) carry out w=w.*|R (:, m) |, operator " .* " expression dot product is got back to step d);

F) wave beam weight w is carried out normalization operation w=norm{w};

G) wave beam weight that the w in the step f) is launched the downlink dedicated channels signal as aerial array carries out the emission of downlink dedicated channels signal.

Fig. 2 is the graph of a relation of correlation ρ size and array direction gain G AIN, provided under 3 kinds of situations of application of beam figuration technology, non-application of beam figuration technology and single antenna, the correlation size and the array direction that can obtain gain, angle spread in the legend is 30 degree, obeys evenly to distribute.Be simplified illustration, represent above-mentioned 3 kinds of methods with sequence number 1-3 respectively.As can be seen from the figure, the several data points of application of beam figuration technology are corresponding respectively a (θ) and | R (:, m) | the wave beam weight w that the dot product of different number of times forms, dot product number of times from left to right is respectively 1-6.The order that the correlation size increases successively among the figure is 2,1,3, and 1 along with w=w.*|R (:, m) | the increase of dot product number of times, correlation increases gradually; And the order that the array direction gain increases successively is 3,2,1 w of a dot product (corresponding), 1 wave beam weight w along with | R (:, m) | the increase of dot product number of times, correlation is improved, but the array direction gain has also inevitably descended, so when adopting the wave beam forming technology, take all factors into consideration the gain of correlation and array direction, determine suitable dot product number of times, obtain maximum array direction yield value in the correlation maximum making.

The increase of the standard deviation of phase deviation is to influence one of reason of systematic function decline.Fig. 3 is after the application of beam figuration technology and does not have the standard deviation comparison diagram of the phase deviation of application of beam figuration technology, as can be seen from the figure, after the application of beam figuration technology (the dot product number of times is 3 times here), the standard deviations of 30 degree angle spread corresponding phase deviations drop to 30% when not having application of beam figuration technology, as seen adopt the present invention can resolution system decreased performance problem; Simultaneously from figure also as can be seen the present invention be suitable for the big situation of angle spread of receiving terminal, just the angle spread of receiving terminal is greater than the situation of 20 degree, just there is obvious performance gain in system like this, and the angle spread of described receiving terminal is meant that multipath signal arrives the broadening of the arrival angle of aerial array.

Fig. 4 is the installation drawing that the present invention adopts the wave beam forming technology.Upward signal estimation module 104 is to be used for from upward signal estimation space correlation matrix R and beam direction angle θ, can utilize upward signal to estimate that the angle spread that obtains spatial correlation matrix R or utilize upward signal to estimate constructs spatial correlation matrix R, but the angle spread of utilizing upward signal to estimate constructs the method list of references " Implementation of spatiotemporally correlated rayleugh fading modelfor smart model for smart antenna applications " of spatial correlation matrix R, TELECOMMUNICATIONS REVIEW, vol.9, No.2,1999,3-4, P173～P183; Beam direction angle θ draws according to decision algorithm according to the beam center angle that upward signal estimates multipath, these methods are meant the method at various estimation beam centers angle, for example the fixed beam in the fixed beam method forms, judge the energy value of different beams then, the wave beam at maximum energy value place is exactly the dedicated channel beam direction angle θ that estimation obtains; Certainly also there are a lot of self adaptations to estimate the method for θ, for example MUSIC (MUltiple Signal Classification) method, EM (Expectation-Maximization) method, SAGE (Space-Alternating Generalized EM) method etc.Calculate the wave beam weight w=a (θ) that the downlink dedicated channels signal is launched according to θ, a (θ) is an array manifold, as formula (2).

Wave beam amplitude weighting module 102 is to be used for drawing the amplitude weighting value according to described spatial correlation matrix R | R (:, m) |, R (:, the m) m of representation space correlation matrix R row; The correlation ρ of wave beam weight w and dedicated channel response and common signal channel response and the relation of array direction gain G AIN such as formula (3), (4), judge according to described wave beam weight w, if the correlation ρ of dedicated channel response and common signal channel response greater than threshold value ρ min and array direction gain G AIN greater than threshold value GAINmin, then wave beam weight w is carried out normalization operation w=norm{w}, and with the wave beam weight w of the w after the normalization as the emission of downlink dedicated channels signal; Otherwise carry out w=w.*|R (:, m) | computing, operator " .* " expression dot product, and carry out above-mentioned judgement again according to the w after the dot product, so circulation is up to satisfying Rule of judgment, w after the dot product that will circulate for several times again carries out normalization operation w=norm{w}, and with the wave beam weight w of the w after the normalization as the emission of downlink dedicated channels signal; Wave beam weight w and dedicated channel signal s (t) are multiplied each other, obtain each dedicated channel signal after the weighting.

Each antenna in the aerial array 101 is launched each dedicated channel signal after the weighting, and the dedicated channel signal of launching is exactly ws (t).

The wave beam forming technology that is emulation is below used the result of the test that the WCDMA downlink wave beam forms link, angle spread be 30 degree down system applies wave beam forming technology do not have the performance gain of application of beam figuration technology to see Table 1 relatively, wherein multipath be provided with CASE1-3 be according to list of references " 3GPP Technical Specification Group Radio Access Network; BSRadio Transmission and Reception (FDD) (Release 1999): TS25.104 V3.10.0 (2002-03) P37 " setting, in table 2, listed its multipath parameter.Test simultaneously also prove angle spread be 30 w=w.*|R of amplitude weighting when spending (:, m) | be that 3 points are taken the opportunity, it is best that performance reaches.

The gain of table 1 wave beam forming technology relative performance

Multipath is provided with	Do not adopt the performance gain of wave beam forming technology relatively
		????CASE1	????????6.5dB
????CASE2	????????1.7dB
		????CASE3	????????0.5dB

Multipath transmisstion parameter under the different CASE of table 2

Case1, speed 3km/h		Case2, speed 3km/h				Case3, speed 120km/h
								Relative time delay [ns]	Average power [dB]		Relative time delay [ns]		Average power [dB]	Relative time delay [ns]	Average power [dB]
?????0	?????0	??0		????????0		?????0	?????0
								?????976	?????-10	??976		????????0		?????260	?????-3
		??20000		????????0		?????521	?????-6
												?????781	?????-9

Present embodiment is one embodiment of the present of invention, changes smart antenna array and the diversity antenna battle array that also is applicable in all FDD communication systems a little.

Claims (10)

1. One kind aerial array is to downlink dedicated channels signal method for transmitting in the FDD communication system, described aerial array is made of at least 2 antennas, it is characterized in that, said method comprising the steps of:

   A) obtain spatial correlation matrix R and beam direction angle θ from upward signal;

   B) obtain the wave beam weight w=a (θ) that the downlink dedicated channels signal is launched according to the beam direction angle θ in the step a), a (θ) is an array manifold;

   C) obtain the amplitude weighting value according to the spatial correlation matrix R in the step a) | R (:, m) |, R (:, the m) m of representation space correlation matrix R row;

   D) judge according to wave beam weight w, if the correlation ρ of dedicated channel response and common signal channel response greater than threshold value ρ min and array direction gain G AIN greater than threshold value GAINmin, execution in step f then), otherwise execution in step e);

   E) carry out w=w.*|R (:, m) |, operator " .* " expression dot product is got back to step d);

   F) wave beam weight w is carried out normalization operation w=norm{w};

   G) wave beam weight that the w in the step f) is launched the downlink dedicated channels signal as aerial array carries out the emission of downlink dedicated channels signal.
2. 2. the method for claim 1, it is characterized in that, in step a), the spatial correlation matrix R that obtains from upward signal utilizes upward signal to estimate that the angle spread that obtains spatial correlation matrix R or utilize upward signal to estimate constructs spatial correlation matrix R.
3. 3. the method for claim 1 is characterized in that, in step a), beam direction angle θ draws according to decision algorithm according to the beam center angle that upward signal estimates multipath.
4. 4. the method for claim 1 is characterized in that, in step a), and spatial correlation matrix R=E[hh ^H], wherein E represents to get desired value, and H represents conjugate transpose,

   $h=\left[\begin{array}{c}h1\\ h2\\ ...\\ h_N\end{array}\right]$

   H is a vector channel responses, and expression arrives the channel factors on the aerial array different antennae, the channel factors of channel that signal experiences just, and wherein N represents the element number of array of aerial array.
5. 5. the method for claim 1 is characterized in that, in step b),

   $a\left(\mathrm{\&theta;}\right)=\left[\begin{array}{c}\exp \left(j2\mathrm{\&pi;}\frac{d}{\mathrm{\&lambda;}}(1-m)\cos \mathrm{\&theta;}\right)\\ \exp \left(j2\mathrm{\&pi;}\frac{d}{\mathrm{\&lambda;}}(2-m)\cos \mathrm{\&theta;}\right)\\ \underset{.}{\overset{.}{.}}\\ \exp \left(j2\mathrm{\&pi;}\frac{d}{\mathrm{\&lambda;}}(i-m)\cos \mathrm{\&theta;}\right)\\ \underset{.}{\overset{.}{.}}\\ \exp \left(j2\mathrm{\&pi;}\frac{d}{\mathrm{\&lambda;}}(N-m)\cos \mathrm{\&theta;}\right)\end{array}\right]$

   Wherein, d is the array element distance of array, and λ is the carrier frequency wavelength, and d/ λ is the array element equivalent separation, and m is array reference array element position, is an array element of getting arbitrarily from aerial array, and N is the array element number of array.
6. 6. the method for claim 1 is characterized in that, the angle spread that described method is applicable to receiving terminal is greater than 20 ° situation, and the angle spread of described receiving terminal is meant that multipath signal arrives the broadening of the arrival angle of aerial array.
7. One kind aerial array is to the device of downlink dedicated channels signal emission in the FDD communication system, described aerial array is made of at least 2 antennas, it is characterized in that, comprising:

   The upward signal estimation module is used for obtaining spatial correlation matrix R and beam direction angle θ from upward signal, and obtains the wave beam weight w=a (θ) of downlink dedicated channels signal emission according to θ;

   Wave beam amplitude weighting module is used for drawing the amplitude weighting value according to described spatial correlation matrix R | R (:, m) |, R (:, the m) m of representation space correlation matrix R row; And according to described wave beam weight w judgement, if the correlation ρ of dedicated channel response and common signal channel response greater than threshold value ρ min and array direction gain G AIN greater than threshold value GAINmin, then wave beam weight w is carried out normalization operation w=norm{w}, and with the wave beam weight w of the w after the normalization as the emission of downlink dedicated channels signal; Otherwise carry out w=w.*|R (:, m) | computing, operator " .* " expression dot product, and carry out above-mentioned judgement again according to the w after the dot product, so circulation is up to satisfying above-mentioned Rule of judgment, w after the dot product that will circulate for several times then carries out normalization operation w=norm{w}, and with the wave beam weight w of the w after the normalization as the emission of downlink dedicated channels signal; Wave beam weight w and dedicated channel signal are multiplied each other, obtain each dedicated channel signal after the weighting;

   Each antenna in the aerial array is launched each dedicated channel signal after the weighting.
8. 8. device as claimed in claim 7 is characterized in that, described upward signal estimation module is to estimate to obtain spatial correlation matrix R module from upward signal.
9. 9. device as claimed in claim 7 is characterized in that, the angle spread that described upward signal estimation module is estimated by upward signal constructs spatial correlation matrix R.
10. 10. device as claimed in claim 7 is characterized in that, described beam direction angle θ draws according to decision algorithm according to the beam center angle that upward signal estimates multipath.

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