CN101237266B - A wave bundle shaping method and device - Google Patents

Abstract

The invention discloses a beam forming method and a device. The method of the invention comprises the following steps that A. a first weighing coefficient vector and a second weighing coefficient vector are respectively obtained for a same code track according to a user space covariance matrix; B. normalization is respectively performed on the first weighing coefficient vector and the second weighing coefficient vector; C. a first received power estimated value and a second received power estimated value of a user terminal corresponding to the code track are obtained respectively according to the first weighing coefficient vector and the second weighing coefficient vector after normalization; D. a weighing coefficient vector is determined according to the first received power estimated value, the second received power estimated value and a preset added value, and beam formation is performed according to the weighing coefficient vector. The invention also discloses a beam forming device.

Description

A kind of beam form-endowing method and device

Technical field

The present invention relates to communication technical field, relate in particular to a kind of beam form-endowing method and device.

Background technology

The wave beam forming technology is widely used in mobile communication system, adopts the array antenna of wave beam forming technology to be commonly referred to as smart antenna.Smart antenna is aimed at desired user with main beam and is carried out receiving and transmitting signal by wave beam forming, has improved the received power of receiving terminal.Smart antenna also can by adjusting the weight coefficient of each antenna element, fall into zero of array antenna direction in the aligning interference user according to the space characteristics of interference signal, can reduce the signal power from interference user like this.At cell edge, because wave beam forming has improved the received power of receiving terminal, so the coverage of sub-district has obtained expansion.

In general, the criterion of wave beam forming comprises maximum power criterion and max carrier to interference criterion etc., the weight coefficient vector that obtains based on the beamforming algorithm of power guidelines, make the received power maximum of receiving terminal, because the algorithm difference that realizes, the optimal solution that can obtain the overall situation also can obtain local optimal solution, for example, the smart antenna that comprises N antenna element, the signal phasor that the desired signal of reception constitutes on many antennas is x=[x ₁, x ₂..., x _N], this signal phasor can obtain by training sequence, for example can be at Time Division-Synchronous Code Division Multiple Access (TD-SCDMA, Time Division-Synchronous Code Division Multiple Access) in the system, carry out channel estimating by the intermediate code that is placed on the data segment centre and obtain described signal phasor, wave beam forming weight coefficient vector is w=[w ₁, w ₂..., w _N], then, make received signal be by wave beam forming:

$y=w^{T}x=\underset{n=1}{\overset{N}{\mathrm{\Σ}}}{w}_n{x}_n$ Formula (1)

Received signal power is:

P=|y| ²=y ^*Y=w ^Hx ^*x ^TW=w ^HR _XxW formula (2)

Wherein, x and y are plural number, x ^*Or y ^*The conjugation of expression plural number, w ^HThe conjugate transpose of expression vector, x ^TThe transposition of expression vector.

Target based on the criterion of maximum power is to seek a weight coefficient vector to make the P in the formula (2) reach maximum:

$w_{\mathrm{opt},1}=\underset{w}{\arg \max }\left(\frac{w^H{R}_{\mathrm{xx}}w}{w^{H}w}\right)$ Formula (3)

W in the formula (3) _{Opt, 1}Be feasible

Get peaked w, it is unique making the separating of w of the P maximum in the formula (2), by formula (3) matrix R as can be known _XxEigenvalue of maximum characteristic of correspondence vector be w _{Opt, 1}, this beam form-endowing method generally is called the eigen beam shaping method, and this method can obtain globally optimal solution.

A kind of beam form-endowing method of simplification is to look for one to make the P in the formula (2) reach peaked weight coefficient vector in a default weight coefficient set of vectors, for example, with the array response vector of interval certain angle method as the weight coefficient set of vectors that sets in advance, L angle got in space to be scanned at regular intervals

With

The orientation angles of representing l direction, l=1 ..., L supposes that the array response vector of all directions is

Described array response vector is represented the relative amplitude phase value of electromagnetic signal on antenna array of a certain direction, so, carries out wave beam forming with this array response vector, and then the received signal power that obtains of receiving terminal can be expressed as:

Formula (4)

Make the angle of received signal power maximum be:

Formula (5)

Formula (3) and formula (5) have been represented two kinds of basic skills of intelligent antenna beam shaping, are respectively eigen beam shaping method and fixed beam shaping method.

The eigen beam shaping method can be realized optimal solution under fixing transmitting power prerequisite, promptly under the situation of given total transmitting power, by the distribution of transmitting power on each antenna and the adjustment of phase place, make the received power maximum of terminal.But, the transmitting power that the eigen beam shaping method distributes on each antenna element is unequal, in real system, the maximum transmission power of antenna element is fixed, if go into power to antenna feed, comprise that then the antenna of radio-frequency channel will be operated in the inelastic region above its emission maximum ability.Therefore, adopt the eigen beam shaping method, actual transmitting power can not reach the maximum transmission power of antenna array.

The fixed beam figuration can be realized each antenna transmitting power unanimity, and the weight coefficient that sets in advance set can the constant amplitude phase modulation, and the realization of wave beam forming is fairly simple, the base station transmits with the maximum transmission power of antenna array, but, adopt the fixed beam shaping method, can't obtain globally optimal solution.

To sum up, the eigen beam figuration of prior art can't make full use of the transmitting power of base station according to the received power requirement of user terminal, and when user terminal needed further to improve received power, the base station can't send signal with maximum transmission power; The fixed beam figuration is when the received power of user terminal is unrestricted, the base station sends signal with maximum transmission power, the transmitting power of waste base station, therefore, when prior art needed further to improve received power at user terminal, the base station can't send signal with maximum transmission power, and when the received power of user terminal is unrestricted, the base station sends signal with maximum transmission power, the transmitting power of waste base station.

Summary of the invention

The invention provides a kind of beam form-endowing method and device, in order to solve prior art when user terminal needs further to improve received power, the base station can't send signal with maximum transmission power, and when the received power of user terminal is unrestricted, the base station sends signal with maximum transmission power, the problem of the transmitting power of waste base station.

A kind of beam form-endowing method provided by the invention comprises:

A. to same code channel, according to the user's space covariance matrix, adopt the eigen beam shaping method to obtain the first weight coefficient vector, and adopt the fixed beam shaping method to obtain the second weight coefficient vector;

B. respectively described first weight coefficient vector and the described second weight coefficient vector are carried out normalization;

C. respectively according to the first weight coefficient vector after the described normalization and the second weight coefficient vector, utilize formula:

$\left\{\begin{array}{c}{\hat{p}}_1=10\lg \left(\right|{\stackrel{\‾}{w}}_{\mathrm{opt},1}^H{R}_{\mathrm{xx}}{\stackrel{\‾}{w}}_{\mathrm{opt},1}\left|\right)\\ {\hat{p}}_2=10\lg \left(\right|{\stackrel{\‾}{w}}_{\mathrm{opt},2}^H{R}_{\mathrm{xx}}{\stackrel{\‾}{w}}_{\mathrm{opt},2}\left|\right)\end{array}\right.$

Obtain the first received power estimated value and the second received power estimated value of described code channel corresponding user terminal; Wherein,

Represent the first received power estimated value, R _XxExpression user's space covariance matrix,

The first weight coefficient vector after the expression normalization,

Represent the second received power estimated value,

The second weight coefficient vector after the expression normalization;

D. according to the first weight coefficient vector after the described normalization and the second weight coefficient vector, the described first received power estimated value and the second received power estimated value, and predefined added value, determine the weight coefficient vector, and carry out wave beam forming according to this weight coefficient vector.

A kind of beam size enlargement apparatus provided by the invention comprises:

The weight coefficient vector units is used for same code channel, according to the user's space covariance matrix, adopts the eigen beam shaping method to obtain the first weight coefficient vector, and adopts the fixed beam shaping method to obtain the second weight coefficient vector;

The normalization unit is used for respectively described first weight coefficient vector and the described second weight coefficient vector being carried out normalization;

The received power estimation unit is used for respectively utilizing formula according to the first weight coefficient vector after the described normalization and the second weight coefficient vector:

$\left\{\begin{array}{c}{\hat{p}}_1=10\lg \left(\right|{\stackrel{\‾}{w}}_{\mathrm{opt},1}^H{R}_{\mathrm{xx}}{\stackrel{\‾}{w}}_{\mathrm{opt},1}\left|\right)\\ {\hat{p}}_2=10\lg \left(\right|{\stackrel{\‾}{w}}_{\mathrm{opt},2}^H{R}_{\mathrm{xx}}{\stackrel{\‾}{w}}_{\mathrm{opt},2}\left|\right)\end{array}\right.$

Obtain the first received power estimated value and the second received power estimated value of described code channel corresponding user terminal; Wherein,

Represent the first received power estimated value, R _XxExpression user's space covariance matrix, The first weight coefficient vector after the expression normalization,

Represent the second received power estimated value,

The second weight coefficient vector after the expression normalization;

Wave beam forming is realized the unit, be used for according to the first weight coefficient vector after the described normalization and the second weight coefficient vector, the described first received power estimated value and the second received power estimated value, and predefined added value, determine the weight coefficient vector, and carry out wave beam forming according to this weight coefficient vector.

The present invention passes through same code channel, according to the user's space covariance matrix, obtain the first weight coefficient vector and the second weight coefficient vector respectively, respectively described first weight coefficient vector and the described second weight coefficient vector are carried out normalization, respectively according to the first weight coefficient vector after the described normalization and the second weight coefficient vector, obtain the first received power estimated value and the second received power estimated value of described code channel corresponding user terminal, according to the described first received power estimated value and the second received power estimated value, and predefined added value, determine the weight coefficient vector, and carry out the technical scheme of wave beam forming according to this weight coefficient vector, make for covering the satisfiable user terminal of power, the received power requirement of user terminal is satisfied in the base station with the transmitting power of minimum, saved the transmitting power of base station, reduce system interference, and for covering the ungratified user terminal of power, but the maximum transmitting power that can make full use of the base station satisfies the received power requirement of user terminal.

Description of drawings

Fig. 1 is the schematic flow sheet of the inventive method;

Fig. 2 is the schematic flow sheet of the inventive method embodiment;

Fig. 3 is the structural representation of apparatus of the present invention embodiment.

Embodiment

Core concept of the present invention is: under the situation that individual antenna transmits with same maximum transmission power, according to the added value that sets in advance, the received power of the terminal that is obtained by eigen beam shaping method and fixed beam shaping method relatively, determine the weight coefficient vector, and carry out wave beam forming according to this weight coefficient vector, advantage in conjunction with eigen beam shaping method of the prior art and fixed beam shaping method, make for covering the satisfiable user terminal of power, the received power requirement of user terminal is satisfied in the base station with the transmitting power of minimum, saved the transmitting power of base station, reduce system interference, and for covering the ungratified user terminal of power, but the maximum transmitting power that can make full use of the base station satisfies the received power requirement of user terminal;

Wherein, the received power of the described terminal that is relatively obtained by eigen beam shaping method and fixed beam shaping method, determine the step of weight coefficient vector, can also account for the ratio of maximum transmission power according to the transmitting power of code channel, and the descending power control command is carried out;

The received power of the terminal that described eigen beam shaping method and fixed beam shaping method are obtained can be the mean value in cycle a period of time.

Referring to Fig. 1, the inventive method embodiment comprises step:

S101, to same code channel, according to the user's space covariance matrix, obtain the first weight coefficient vector and the second weight coefficient vector respectively;

S102, respectively described first weight coefficient vector and the described second weight coefficient vector are carried out normalization;

S103, respectively according to the first weight coefficient vector after the described normalization and the second weight coefficient vector, obtain the first received power estimated value and the second received power estimated value of described code channel corresponding user terminal;

S104, according to the described first received power estimated value and the second received power estimated value, and predefined added value is determined the weight coefficient vector, and is carried out wave beam forming according to this weight coefficient vector;

For example, utilize formula

Determine the weight coefficient vector, wherein,

Be the first weight coefficient vector,

The second weight coefficient vector,

Be the first received power estimated value,

It is the second received power estimated value, described added value ε can be made as on the occasion of also being made as negative value, if be set on the occasion of, determine that then the weight coefficient vector is the first weight coefficient vector, illustrate that the preferential eigen beam shaping method of selecting carries out wave beam forming, otherwise, determine that the weight coefficient vector is the second weight coefficient vector, illustrate that the preferential fixed beam shaping method of selecting carries out wave beam forming, be set to 1dB, have only so when using such as ε

The power that terminal receives is than use

The time during terminal power that receives high 1dB, just selection As final weight coefficient vector;

Preferably, further according to the code channel maximum transmission power, and the proportionality coefficient of the code channel transmitting power that sets in advance, determine the weight coefficient vector;

For example, utilize formula

Determine the weight coefficient vector, wherein, P _tBe present code channel transmitting power, η represents proportionality coefficient, P _MaxBe the code channel maximum transmission power, under this implementation, as code channel transmitting power P _tAccount for code channel maximum transmission power P _MaxDuring certain proportion, just consider to adopt the good weight coefficient vector of terminal received power

For example, when η got 1, the terminal received power was just considered in expression when code channel power is launched with full power; Otherwise, still adopt weight coefficient vector, promptly based on characteristic value decomposition

Preferably, further according to the descending power control command, determine the weight coefficient vector;

For example, utilize formula

Determine the weight coefficient vector, wherein, PC_word is the downlink power control order, represents to improve down transmitting power when PC_word=1, represents to reduce down transmitting power when PC_word=0, under this implementation, when the code channel transmitting power accounts for code channel maximum transmission power certain proportion and terminal and wishes to continue to improve down transmitting power, just consider the good weight coefficient of employing terminal received power, otherwise, still adopt weight coefficient vector, promptly based on characteristic value decomposition

Preferably, step S103 further comprises the step of the mean value of the mean value that obtains described first received power and first received power of second received power in the time cycle that sets in advance and second received power;

Then, step S104 is:

According to the mean value of the described first received power estimated value and the mean value of the second received power estimated value, and predefined added value, determine the weight coefficient vector, and carry out wave beam forming according to this weight coefficient vector.

Referring to Fig. 2, the inventive method embodiment comprises step:

S201, by the user's space covariance matrix, obtain the first weight coefficient vector, further, obtain the second weight coefficient vector by array response vector;

Wherein, described user's space covariance matrix Rxx can obtain by channel estimating;

According to user's space covariance matrix Rxx, utilize formula (3) to obtain the first weight coefficient vector w _{Opt, 1}

According to user's space covariance matrix Rxx and array response vector

Utilize formula (5) to obtain the second weight coefficient vector w _{Opt, 2}

S202, the described first weight coefficient vector and the second weight coefficient vector are carried out normalization;

Obtain w _{Opt, 1}And w _{Opt, 2}Identical maximum, the i.e. maximum transmission power of individual antenna;

$\left\{\begin{array}{c}{\stackrel{\‾}{w}}_{\mathrm{opt},1}=w_{\mathrm{opt},1}/\max \left(\right\{\left|w_{\mathrm{opt},\mathrm{1,1}}\right|,\left|w_{\mathrm{opt},\mathrm{1,2}}\right|,\·\·\·,\left|w_{\mathrm{opt},1,N}\right|\left\}\right)\\ {\stackrel{\‾}{w}}_{\mathrm{opt},2}=w_{\mathrm{opt},2}/\max \left(\right\{\left|w_{\mathrm{opt},\mathrm{2,1}}\right|,\left|w_{\mathrm{opt},\mathrm{2,2}}\right|,\·\·\·,\left|w_{\mathrm{opt},2,N}\right|\left\}\right)\end{array}\right.$

By following formula, obtain w _{Opt, 1}And w _{Opt, 2}Identical maximum is 1;

S203, respectively according to the first weight coefficient vector after the normalization and the second weight coefficient vector, obtain the first received power estimated value and the second received power estimated value of terminal;

Utilize formula:

$\left\{\begin{array}{c}{\hat{p}}_1=10\lg \left(\right|{\stackrel{\‾}{w}}_{\mathrm{opt},1}^H{R}_{\mathrm{xx}}{\stackrel{\‾}{w}}_{\mathrm{opt},1}\left|\right)\\ {\hat{p}}_2=10\lg \left(\right|{\stackrel{\‾}{w}}_{\mathrm{opt},2}^H{R}_{\mathrm{xx}}{\stackrel{\‾}{w}}_{\mathrm{opt},2}\left|\right)\end{array}\right.$

Acquisition under the situation that individual antenna transmits with described maximum transmission power, the first received power estimated value of terminal

With the second received power estimated value

S204, judge the described second received power estimated value whether greater than described first received power estimated value and added value and, if, then carry out step S205, otherwise, carry out step S208;

S205, judge the code channel transmitting power whether more than or equal to the product of code channel maximum transmission power and proportionality coefficient, if, then carry out step S206, otherwise, carry out step S208;

S206, judge whether need to improve down transmitting power, if, then carry out step S207, otherwise, carry out step S208;

According to the downlink power control order is that PC_word judges whether that needs improve down transmitting power, represents that when PC_word=1 needs improve down transmitting power, represents that when PC_word=0 needs reduce down transmitting power;

S207, carry out wave beam forming according to the second weight coefficient vector;

Have only when the judged result of step S204, S205 and S206 all when being, carry out wave beam forming according to the second weight coefficient vector, promptly adopt the fixed beam shaping method to carry out wave beam forming;

S208, carry out wave beam forming according to the first weight coefficient vector;

When the judged result of step S204, S205 and S206 has one for not the time, carry out wave beam forming according to the first weight coefficient vector, promptly adopt the eigen beam shaping method to carry out wave beam forming.

Determine the method for wave beam forming weight coefficient vector, can be weighted calculating, judgement and the selection of coefficient vector in real time, also can periodically adjust the wave beam forming mode and determine wave beam forming weight coefficient vector, promptly every some cycles, adjust one time the figuration mode, its specific implementation also can be selected:

Mode one: according to the added value that sets in advance, the relatively average of the first received power estimated value and the average of the second received power estimated value in the cycle that sets in advance;

Mode two: according to the added value that sets in advance, the relatively average of the first received power estimated value and the average of the second received power estimated value in the cycle that sets in advance, and the code channel average transmit power accounts for maximum transmission power ratio;

Mode three: according to the added value that sets in advance, relatively the average of the first received power estimated value and average, the code channel average transmit power of the second received power estimated value account for maximum transmission power ratio in the cycle that sets in advance, and the statistics power control command;

Above-mentioned three kinds of implementations are basic identical with the implementation of calculating the weight coefficient vector in real time, difference is to replace with the mean value in some cycles of terminal received power the instantaneous value of terminal received power, and adjusted after the figuration mode, the figuration mode is constant in one-period;

In the specific implementation step of above-mentioned three kinds of implementations, also can calculate a kind of weight coefficient vector earlier, when the selection condition is set up, calculate another weight coefficient vector again, compare selection again;

For example: in the time of employing mode two, at first calculate the second weight coefficient vector Judge code channel transmitting power p then _tWhether satisfy P _t〉=η P _MaxIf, satisfy, then calculate the first weight coefficient vector w _{Opt, 1}, and respectively according to w _{Opt, 1}With

Estimate first received power of terminal

With second received power

And compare according to the added value that sets in advance, determine the weight coefficient vector that adopts; If do not satisfy P _t〉=η P _Max, then directly utilize Carry out wave beam forming, and need not to calculate again w _{Opt, 1}

And for example: in the time of employing mode three, at first judge whether satisfy condition PC_word=1 or P _t〉=η P _MaxIf, do not satisfy one of them, then only calculate the first weight coefficient vector w _{Opt, 1}, and utilize w _{Opt, 1}Carry out wave beam forming; If these two conditions all satisfy, calculate the first weight coefficient vector w again _{Opt, 1}With the second weight coefficient vector

And respectively according to w _{Opt, 1}With

Estimate first received power of terminal

With second received power

And compare according to the added value that sets in advance, determine the weight coefficient vector that adopts.

Referring to Fig. 3, apparatus of the present invention embodiment comprises: weight coefficient vector units 31, normalization unit 32, received power estimation unit 33 and wave beam forming are realized unit 34;

Described received power estimation unit 33 comprises: the first received power estimated value unit 331, second received power estimated value unit 332 and the mean value unit 333;

Described wave beam forming realizes that unit 34 comprises: added value unit 341, proportionality coefficient unit 342, descending power control command unit 343, determine weight coefficient vector units 344 and realize unit 345;

Described weight coefficient vector units 31 to same code channel, according to the user's space covariance matrix, obtains the first weight coefficient vector and the second weight coefficient vector respectively;

Described normalization unit 32 carries out normalization to described first weight coefficient vector and the described second weight coefficient vector respectively;

Described received power estimation unit 33 respectively according to the first weight coefficient vector after the described normalization and the second weight coefficient vector, obtains the first received power estimated value and the second received power estimated value of described code channel corresponding user terminal;

Wherein, the described first received power estimated value unit 331 is used for obtaining the first received power estimated value of described code channel corresponding user terminal according to the first weight coefficient vector after the described normalization;

The described second received power estimated value unit 332 is used for obtaining the second received power estimated value of described code channel corresponding user terminal according to the second weight coefficient vector after the described normalization;

Described mean value unit 333, the mean value of the described first received power estimated value in the time cycle that is used to obtain to set in advance and the mean value of the described second received power estimated value;

Described wave beam forming is realized unit 34, according to the proportionality coefficient of the mean value of the described first received power estimated value and the mean value of the second received power estimated value, predefined added value, code channel maximum transmission power, the code channel transmitting power that sets in advance and the value of descending power control command, determine the weight coefficient vector, and carry out wave beam forming according to this weight coefficient vector;

Wherein, described added value unit 341 is used to store predefined added value;

Described proportionality coefficient unit 342 is used to store the proportionality coefficient that the code channel transmitting power that sets in advance accounts for the code channel maximum transmission power;

Described descending power control command unit 343 is used to store the value of descending power control command;

Described definite weight coefficient vector units 344, be used for determining the weight coefficient vector according to the proportionality coefficient of the described first received power estimated value and the second received power estimated value, described predefined added value, code channel maximum transmission power, the code channel transmitting power that sets in advance and the value of descending power control command;

Described realization unit 345 is used for carrying out wave beam forming according to this weight coefficient vector.

Compare with the fixed beam shaping method, the advantage of eigen beam figuration is under the certain situation of transmitting power, and the power maximum that terminal is received is when satisfying the received power of terminal expectation, make the power minimum of base station, help reducing system interference, yet the shortcoming of eigen beam figuration is, the transmitting power difference of each antenna, under the restriction of individual antenna maximum transmission power, total transmitting power of base station is subjected to the restriction of wave beam forming, and this covers for the sub-district is disadvantageous;

The present invention combines the advantage of described two kinds of beam form-endowing methods, for covering the satisfiable user terminal of power, reduces system interference by the eigen beam figuration; For covering the ungratified user terminal of power, but make full use of the maximum transmitting power of base station by the fixed beam figuration, therefore, the present invention can be according to the received power of user terminal, adjust the transmitting power of base station neatly, satisfied the interference inhibition of user terminal and the demand that covers most possibly.

The present invention is not limited only to by relatively adopting eigen beam figuration algorithm first received power estimated value that obtains and the second received power estimated value that adopts fixed beam figuration algorithm to obtain, determine the weight coefficient vector, the received power estimated value that can also relatively adopt other algorithms to obtain, determine the weight coefficient vector, and carry out wave beam forming according to this weight coefficient vector.

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

Claims (11)

1. a beam form-endowing method is characterized in that, this method may further comprise the steps:

A. to same code channel, according to the user's space covariance matrix, adopt the eigen beam shaping method to obtain the first weight coefficient vector, and adopt the fixed beam shaping method to obtain the second weight coefficient vector;

B. respectively described first weight coefficient vector and the described second weight coefficient vector are carried out normalization;

C. respectively according to the first weight coefficient vector after the described normalization and the second weight coefficient vector, utilize formula:

$\left\{\begin{array}{c}{\hat{p}}_1=10\lg \left(\right|{\stackrel{\‾}{w}}_{\mathrm{opt},1}^H{R}_{\mathrm{xx}}{\stackrel{\‾}{w}}_{\mathrm{opt},1}\left|\right)\\ {\hat{p}}_2=10\lg \left(\right|{\stackrel{\‾}{w}}_{\mathrm{opt},2}^H{R}_{\mathrm{xx}}{\stackrel{\‾}{w}}_{\mathrm{opt},2}\left|\right)\end{array}\right.$

Obtain the first received power estimated value and the second received power estimated value of described code channel corresponding user terminal; Wherein,

Represent the first received power estimated value, R _XxExpression user's space covariance matrix,

The first weight coefficient vector after the expression normalization,

Represent the second received power estimated value,

The second weight coefficient vector after the expression normalization;

D. according to the first weight coefficient vector after the described normalization and the second weight coefficient vector, the described first received power estimated value and the second received power estimated value, and predefined added value, determine the weight coefficient vector, and carry out wave beam forming according to this weight coefficient vector.

2. the method for claim 1 is characterized in that, utilizes formula among the step D:

$\left\{\begin{array}{c}{w}_{\mathrm{opt}}={\stackrel{\‾}{w}}_{\mathrm{opt},2},\mathrm{if}{\hat{p}}_2\≥{\hat{p}}_1+\mathrm{\ϵ}\\ w_{\mathrm{opt}}={\stackrel{\‾}{w}}_{\mathrm{opt},1},\mathrm{else}\end{array}\right.$

Determine described weight coefficient vector, wherein, Be the first weight coefficient vector after the described normalization,

Be the second weight coefficient vector after the described normalization, Be the described first received power estimated value,

Be the described second received power estimated value, ε is predefined added value, when described added value be on the occasion of the time, determine that then the weight coefficient vector is the described first weight coefficient vector, otherwise, determine that the weight coefficient vector is the described second weight coefficient vector.

3. the method for claim 1 is characterized in that, utilizes formula among the step D:

Determine the weight coefficient vector, wherein,

Be the first weight coefficient vector after the described normalization,

Be the second weight coefficient vector after the described normalization,

Be the described first received power estimated value,

Be the described second received power estimated value, ε is predefined added value, P _tBe code channel transmitting power at present, η is the proportionality coefficient of the code channel transmitting power that sets in advance, P _MaxBe the code channel maximum transmission power.

4. the method for claim 1 is characterized in that, utilizes formula among the step D:

Determine the weight coefficient vector, wherein, Be the first weight coefficient vector after the described normalization,

Be the second weight coefficient vector after the described normalization,

Be the described first received power estimated value,

Be the described second received power estimated value, ε is predefined added value, P _tBe code channel transmitting power at present, η is the proportionality coefficient of the code channel transmitting power that sets in advance, P _MaxBe the code channel maximum transmission power, PC_word is the downlink power control order, represents to improve down transmitting power when PC_word=1, represents to reduce down transmitting power when PC_word=0.

5. the method for claim 1, it is characterized in that, step C further comprises the mean value that obtains the first received power estimated value of the described first received power estimated value in the time cycle that sets in advance, and the step that obtains the mean value of the second received power estimated value of the described second received power estimated value in the time cycle that sets in advance;

Step D is:

According to the first weight coefficient vector after the described normalization and the second weight coefficient vector, the mean value of the mean value of the described first received power estimated value and the second received power estimated value, and predefined added value, determine the weight coefficient vector, and carry out wave beam forming according to this weight coefficient vector.

6. a beam size enlargement apparatus is characterized in that, this device comprises:

The weight coefficient vector units is used for same code channel, according to the user's space covariance matrix, adopts the eigen beam shaping method to obtain the first weight coefficient vector, and adopts the fixed beam shaping method to obtain the second weight coefficient vector;

The normalization unit is used for respectively described first weight coefficient vector and the described second weight coefficient vector being carried out normalization;

The received power estimation unit is used for respectively utilizing formula according to the first weight coefficient vector after the described normalization and the second weight coefficient vector:

$\left\{\begin{array}{c}{\hat{p}}_1=10\lg \left(\right|{\stackrel{\‾}{w}}_{\mathrm{opt},1}^H{R}_{\mathrm{xx}}{\stackrel{\‾}{w}}_{\mathrm{opt},1}\left|\right)\\ {\hat{p}}_2=10\lg \left(\right|{\stackrel{\‾}{w}}_{\mathrm{opt},2}^H{R}_{\mathrm{xx}}{\stackrel{\‾}{w}}_{\mathrm{opt},2}\left|\right)\end{array}\right.$

Obtain the first received power estimated value and the second received power estimated value of described code channel corresponding user terminal; Wherein, Represent the first received power estimated value, R _XxExpression user's space covariance matrix,

The first weight coefficient vector after the expression normalization,

Represent the second received power estimated value,

The second weight coefficient vector after the expression normalization;

Wave beam forming is realized the unit, be used for according to the first weight coefficient vector after the described normalization and the second weight coefficient vector, the described first received power estimated value and the second received power estimated value, and predefined added value, determine the weight coefficient vector, and carry out wave beam forming according to this weight coefficient vector.

7. device as claimed in claim 6 is characterized in that, described wave beam forming realizes that the unit comprises:

The added value unit is used to store predefined added value;

Determine the weight coefficient vector units, be used to utilize formula:

$\left\{\begin{array}{c}{w}_{\mathrm{opt}}={\stackrel{\‾}{w}}_{\mathrm{opt},2},\mathrm{if}{\hat{p}}_2\≥{\hat{p}}_1+\mathrm{\ϵ}\\ w_{\mathrm{opt}}={\stackrel{\‾}{w}}_{\mathrm{opt},1},\mathrm{else}\end{array}\right.$

Determine described weight coefficient vector, wherein,

Be the first weight coefficient vector after the described normalization,

Be the second weight coefficient vector after the described normalization,

Be the described first received power estimated value,

Be the described second received power estimated value, ε is predefined added value, when described added value be on the occasion of the time, determine that then the weight coefficient vector is the described first weight coefficient vector, otherwise, determine that the weight coefficient vector is the described second weight coefficient vector;

Realize the unit, be used for carrying out wave beam forming according to this weight coefficient vector.

8. device as claimed in claim 6 is characterized in that, described wave beam forming realizes that the unit comprises:

The added value unit is used to store predefined added value;

The proportionality coefficient unit is used to store the proportionality coefficient that the code channel transmitting power that sets in advance accounts for the code channel maximum transmission power;

Determine the weight coefficient vector units, be used to utilize formula:

Determine the weight coefficient vector, wherein,

Be the first weight coefficient vector after the described normalization,

Be the second weight coefficient vector after the described normalization, Be the described first received power estimated value, Be the described second received power estimated value, ε is predefined added value, P _tBe code channel transmitting power at present, η is the proportionality coefficient of the code channel transmitting power that sets in advance, P _MaxBe the code channel maximum transmission power;

Realize the unit, be used for carrying out wave beam forming according to this weight coefficient vector.

9. device as claimed in claim 6 is characterized in that, described wave beam forming realizes that the unit further comprises:

The added value unit is used to store predefined added value;

The proportionality coefficient unit is used to store the proportionality coefficient that the code channel transmitting power that sets in advance accounts for the code channel maximum transmission power;

Descending power control command unit is used to store the value of descending power control command;

Determine the weight coefficient vector units, be used to utilize formula:

Determine the weight coefficient vector, wherein, Be the first weight coefficient vector after the described normalization,

Be the second weight coefficient vector after the described normalization,

Be the described first received power estimated value,

Be the described second received power estimated value, ε is predefined added value, P _tBe code channel transmitting power at present, η is the proportionality coefficient of the code channel transmitting power that sets in advance, P _MaxBe the code channel maximum transmission power, PC_word is the downlink power control order, represents to improve down transmitting power when PC_word=1, represents to reduce down transmitting power when PC_word=0;

Realize the unit, be used for carrying out wave beam forming according to this weight coefficient vector.

10. device as claimed in claim 6 is characterized in that, described received power estimation unit comprises:

The first received power estimated value unit is used for obtaining the first received power estimated value of described code channel corresponding user terminal according to the first weight coefficient vector after the described normalization;

The second received power estimated value unit is used for obtaining the second received power estimated value of described code channel corresponding user terminal according to the second weight coefficient vector after the described normalization.

11. device as claimed in claim 6 is characterized in that, described received power estimation unit further comprises:

The mean value unit, the mean value of the described first received power estimated value in the time cycle that is used to obtain to set in advance and the mean value of the described second received power estimated value;

Then, described wave beam forming is realized the unit, be used for according to the first weight coefficient vector after the described normalization and the second weight coefficient vector, the mean value of the mean value of the described first received power estimated value and the second received power estimated value, and predefined added value, determine the weight coefficient vector, and carry out wave beam forming according to this weight coefficient vector.

Images