CN102026349A - Control method and device for transmitting power - Google Patents

Abstract

The invention provides a control method and a control device for transmitting power. The control method comprises the following steps of: recording loop gain, feedback link gain and a gain control coefficient of a feedback link at reference time; and reading loop gain, feedback link gain and a gain control coefficient of a feedback link at the current time to acquire gain variable quantity and forward link gain variable quantity which are caused by the environment change of the feedback link, and completing compensation. By the control method and the control device for the transmitting power, the transmitting power can be compensated in real time with high accuracy.

Description

The control method of transmitting power and device

Technical field

The present invention relates to the communication technology, relate in particular to a kind of control method and device of transmitting power.

Background technology

Along with the fast development of the communication technology, the quality of communication comes into one's own more, guarantees that in communication system the power stability that transmits is very important.For example, in code division multiple access (CDMA) communication system, the quality of communication directly depends on the transmitting power of base station and terminal, and the transmitting power of base station directly determines the radius of society that covers.For improve power system capacity and reduce communicate by letter in the blind area of appearance, generally all require transmitting power be stabilized in ± 2dB in.

In order to guarantee the stable of transmitting power, must compensate the gain fluctuation of not expecting in the whole transmitting chain by certain mechanism.For example, the gain fluctuation of the transmitting chain that causes along with variation of temperature or the aging gain fluctuation that causes of device.The process that the calibration of power is all arranged in the present communication system, purpose are by calibration, shift the power of antenna opening onto a desired value in some moment, as 40W, and 60W etc., this process also is referred to as calibration.

But calibration only is in some moment, and non real-time carries out, and it can't compensate the fluctuation of the antenna opening gain that occurs along with environmental change, so must set up the compensation that a kind of real-time mechanism is finished transmitting power.

Summary of the invention

In order to solve the problems of the technologies described above, the invention provides a kind of control method and device of transmitting power, to finish the compensation of transmitting power in real time.

The invention provides a kind of control method of transmitting power, this method comprises:

The accommodation coefficient of gain of record benchmark loop gain, based on feedback link gain and based on feedback link constantly;

Read the accommodation coefficient of gain of loop gain, based on feedback link gain and the based on feedback link of current time, obtain change in gain amount and forward link gain variable quantity that the based on feedback link environmental change causes, and finish compensation.

Preferably, the control method of above-mentioned transmitting power can have following characteristics:

After finishing compensation, described method also comprises:

Calculate the error of bringing after the compensation, and calibrate according to described error.

Preferably, the control method of above-mentioned transmitting power also can have following characteristics:

After obtaining the forward link gain variable quantity, described method also comprises:

If it is legal to determine described forward link gain variable quantity, then compensate.

Preferably, the control method of above-mentioned transmitting power also can have following characteristics:

Change in gain amount and forward link gain variable quantity that the environmental change of described acquisition based on feedback link causes comprise:

Obtain the forward link gain variable quantity by the variable quantity computing formula, described variable quantity computing formula is:

ΔK _tx(t _n-1→t _n)＝G _fb(t _n，K _fb(t ₀))-G _fb(t ₀，K _fb(t ₀))+K _fb(t _n)-K _fb(t ₀)+G _loop(t ₀，K _tx(t ₀)，K _fb(t ₀))-G _loop(t _n，K _tx(t _n-1)，K _fb(t _n))

Wherein, Δ K _Tx(t _N-1→ t _n) be the forward link gain variable quantity, G _Loop(t ₀, K _Tx(t ₀), K _Fb(t ₀)) be t ₀Corresponding constantly loop gain, G _Loop(t _n, K _Tx(t _N-1), K _Fb(t _n)) be t _nCorresponding constantly loop gain, K _Fb(t ₀) be t ₀The accommodation coefficient of gain of the based on feedback link that the moment is corresponding, K _Fb(t _n) be t _nThe accommodation coefficient of gain of the based on feedback link that the moment is corresponding, G _Fb(t ₀, K _Fb(t ₀) be t ₀The gain of based on feedback link correspondence constantly, G _Fb(t _n, K _Fb(t ₀)) be t _nThe gain of based on feedback link correspondence constantly; G _Fb(t _n, K _Fb(t ₀))-G _Fb(t ₀, K _Fb(t ₀)) the change in gain amount that causes for the based on feedback link environmental change.

Preferably, the control method of above-mentioned transmitting power also can have following characteristics:

The described error of bringing after the compensation that calculates comprises:

Calculate this error by the Error Calculation formula, this Error Calculation formula is:

E(t _n)＝{G(t _n)-G(t ₀)}-{G _fb(t _n，K _fb(t ₀))-G _fb(t ₀，K _fb(t ₀))+K _fb(t _n)-K _fb(t ₀)}

Wherein, E (t _n) be t _nConstantly finish the error of bringing after the forward direction compensation, G (t ₀) be t ₀Constantly finish the loop gain of reading after forward gain is regulated, G (t _n) be t _nConstantly finish the loop gain of reading after forward gain is regulated, K _Fb(t ₀) be t ₀The accommodation coefficient of gain of the based on feedback link that the moment is corresponding, K _Fb(t _n) be t _nThe accommodation coefficient of gain of the based on feedback link that the moment is corresponding, G _Fb(t ₀, K _Fb(t ₀) be t ₀The gain of based on feedback link correspondence constantly, G _Fb(t _n, K _Fb(t ₀)) be t _nThe gain of based on feedback link correspondence constantly.

The present invention also provides a kind of control device of transmitting power, and described device comprises:

Logging modle is used to write down benchmark loop gain and based on feedback link gain constantly; And

Compensating module, the loop gain and the based on feedback link gain that are used to read current time obtain change in gain amount and forward link gain variable quantity that the based on feedback link environmental change causes, and finish compensation.

Preferably, above-mentioned control device can have following characteristics:

Calibration module is used for after finishing compensation, calculates the error of bringing after the compensation, and calibrates according to described error.

Preferably, above-mentioned control device also can have following characteristics:

Described compensating module comprises: determining unit is used for determining the legitimacy of described forward link gain variable quantity after obtaining the forward link gain variable quantity; And compensating unit, be used for described determining unit determine described forward link gain variable quantity legal after, compensate.

Preferably, above-mentioned control device also can have following characteristics:

Described compensating module is further used for obtaining the forward link gain variable quantity by the variable quantity computing formula, and described variable quantity computing formula is:

ΔK _tx(t _n-1→t _n)＝G _fb(t _n，K _fb(t ₀))-G _fb(t ₀，K _fb(t ₀))+K _fb(t _n)-K _fb(t ₀)+G _loop(t ₀，K _tx(t ₀)，K _fb(t ₀))-G _loop(t _n，K _tx(t _n-1)，K _fb(t _n))

Wherein, Δ K _Tx(t _N-1→ t _n) be the forward link gain variable quantity, G _Loop(t ₀, K _Tx(t ₀), K _Fb(t ₀)) be t ₀Corresponding constantly loop gain, G _Loop(t _n, K _Tx(t _N-1), K _Fb(t _n)) be t _nCorresponding constantly loop gain, K _Fb(t ₀) be t ₀The accommodation coefficient of gain of the based on feedback link that the moment is corresponding, K _Fb(t _n) be t _nThe accommodation coefficient of gain of the based on feedback link that the moment is corresponding, G _Fb(t ₀, K _Fb(t ₀) be t ₀The gain of based on feedback link correspondence constantly, G _Fb(t _n, K _Fb(t ₀)) be t _nThe gain of based on feedback link correspondence constantly; G _Fb(t _n, K _Fb(t ₀))-G _Fb(t ₀, K _Fb(t ₀)) the change in gain amount that causes for the based on feedback link environmental change.

Preferably, above-mentioned control device also can have following characteristics:

Described calibration module is further used for calculating this error by the Error Calculation formula, and this Error Calculation formula is:

E(t _n)＝{G(t _n)-G(t ₀)}-{G _fb(t _n，K _fb(t ₀))-G _fb(t ₀，K _fb(t ₀))+K _fb(t _n)-K _fb(t ₀)}

Wherein, E (t _n) be t _nConstantly finish the error of bringing after the forward direction compensation, G (t ₀) be t ₀Constantly finish the loop gain of reading after forward gain is regulated, G (t _n) be t _nConstantly finish the loop gain of reading after forward gain is regulated, K _Fb(t ₀) be t ₀The accommodation coefficient of gain of the based on feedback link that the moment is corresponding, K _Fb(t _n) be t _nThe accommodation coefficient of gain of the based on feedback link that the moment is corresponding, G _Fb(t ₀, K _Fb(t ₀) be t ₀The gain of based on feedback link correspondence constantly, G _Fb(t _n, K _Fb(t ₀)) be t _nThe gain of based on feedback link correspondence constantly.

The control method of above-mentioned transmitting power and control device can be finished the compensation of transmitting power in real time, accurately.

Description of drawings

Fig. 1 is a closed-loop control model framework chart of the present invention;

Fig. 2 finishes the flow chart of compensation and calibration process automatically for the present invention;

Fig. 3 is the emission used in the cdma system of the present invention and the theory diagram of based on feedback link;

The curve chart of the loop gain fluctuation that Fig. 4 causes for system temperature of the present invention changes;

Fig. 5 changes the curve chart of the based on feedback link gain fluctuation that causes for system temperature of the present invention;

Fig. 6 launches the curve chart of power fluctuation down for automatic gain control of the present invention;

Fig. 7 is the structural representation of the control device of transmitting power of the present invention.

Embodiment

The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.

The invention provides a kind of control method of transmitting power, described method comprises:

Loop gain and the based on feedback link gain constantly of step 1, record benchmark;

Step 2, the loop gain of reading current time and based on feedback link gain obtain change in gain amount and forward link gain variable quantity that the based on feedback link environmental change causes, and finish compensation.

Wherein, obtaining the change in gain amount that the based on feedback link environmental change causes and the concrete grammar of forward link gain variable quantity will be described in detail below;

After this step, this method can also comprise: calculate the error of bringing after the compensation, and described error compensation is arrived numeric field; The purpose of doing like this is the precision in order to guarantee to control.

The control method of transmitting power may be summarized to be two kinds: a kind of is open loop control, and a kind of is closed-loop control.Open loop control is meant obtains the factor that may cause change in gain in the transmitting chain and the form one to one of variable quantity in advance, and monitoring constantly causes the variation of the factor of change in gain in system employs then, and tabling look-up then compensates.For example, can obtain in advance that temperature compensates according to variation of temperature then with the relation of change in gain on the transmitting chain.Closed-loop control need not to obtain in advance the variable quantity of transmitting chain gain, but controls by the method for real-time detection.

The closed-loop control model framework chart as shown in Figure 1, wherein, K _TxAnd K _FbBe respectively the control coefrficient of transmitting power and feedback power; K _eBe referred to as to be transmitted into the power coupling ratio of feedback, this value is generally constant, so the gain of based on feedback link can the variable coefficient unification be K _FbCan calculate the loop gain G of any time among Fig. 1 _Loop, G _LoopIn comprised the variation of forward direction and based on feedback link gain, the transmitting power core concept of control automatically is exactly under the situation of knowing the gain of loop gain and based on feedback link, extracts the undulate quantity in some moment of forward link gain, then by regulating K _TxCompensate, keep the gain constant of transmitting chain.

Run to some moment such as system powers in system, transmitting power can be controlled at some values by the mechanism of some calibrations, and this process is referred to as calibration, claim this constantly for benchmark constantly, use t ₀Expression, t ₀The power of each point all is referred to as reference power in the time chart 1.

Automatically the purpose of power controlling is that the assurance system guarantees all the time that in running the gain constant of transmitting chain is t ₀Yield value is supposed t constantly ₀The gain of transmitting chain correspondence is G constantly _Tx(t ₀), the gain of based on feedback link correspondence is G simultaneously _Fb(t ₀), for the ease of calculating, below power unit be dBm, the unit of gain is dB, then:

P _out(t ₀)＝P _in(t ₀)+G _tx(t ₀) (1)

P _fb(t ₀)＝P _out(t ₀)+G _fb(t ₀) (2)

The gain of whole loop can be used P among Fig. 1 _Fb-P _InRepresent, then t ₀Loop gain constantly is:

G _loop(t ₀)＝P _fb(t ₀)-P _in(t ₀)

＝P _out(t ₀)+G _fb(t ₀)-P _out(t ₀)+G _tx(t ₀) (3)

＝G _fb(t ₀)+G _tx(t ₀)

G _tx(t ₀)＝G _loop(t ₀)-G _fb(t ₀) (4)

Formula (4) is without loss of generality, and can obtain the gain of transmitting chain, and the pass between loop gain and the feedback oscillator is:

G _tx(t)＝G _loop(t)-G _fb(t) (5)

The purpose of power controlling is to keep the gain constant of transmitting chain at t ₀Constantly, so, if think that at a time it is t that t still keeps the gain constant of transmitting chain ₀Yield value just must obtain the t of t contrast constantly constantly ₀The change in gain amount of transmitting chain constantly, and with this variable quantity by regulating K _TxCompensate, describe below and how to obtain K _TxVariable quantity.

The gain of middle forward direction of formula (5) and feedback is all relevant with accommodation coefficient of gain K on time t and the link, is the function of time and accommodation coefficient of gain; So forward direction and based on feedback link more generally expression formula are:

G _tx(t，K _tx(t))＝G _loop(t，K _tx(t)，K _fb(t))-G _fb(t，K _fb(t))?(6)

G in the following formula _Loop(t, K _Tx(t), K _Fb(t)) value can calculate at t constantly according to formula (3); In order to make forward gain remain unchanged, then any moment G _Tx(t, K _Tx(t)) must keep t ₀Value constantly, that is:

G _tx(t，K _tx(t))＝G _loop(t，K _tx(t)，K _fb(t))-G _fb(t，K _fb(t))＝G _tx(t ₀，K _tx(t ₀))(7)

With t ₀Be benchmark constantly, link gain can be by two factors decisions at t variable quantity constantly so: first be link gain along with the variation generation of environment with respect to t ₀Change in gain constantly, second be since gain coefficient with respect to t ₀Variation constantly (can usually be adjusted be used for power back-off as gain coefficient in gain controlling), this moment, link gain can be expressed as:

G _tx(t，K _tx(t))＝G _tx(t，K _tx(t ₀))+K _tx(t)-K _tx(t ₀)(8)

G _fb(t，K _fb(t))＝G _fb(t，K _fb(t ₀))+K _fb(t)-K _fb(t ₀)(9)

G _loop(t，K _tx(t)，K _fb(t))＝G _loop(t，K _tx(t ₀)，K _fb(t ₀))+K _tx(t)-K _tx(t ₀)+K _fb(t)-K _fb(t ₀)

＝G _loop(t，K _tx(t)，K _fb(t ₀))+K _fb(t)-K _fb(t ₀)(10)

＝G _loop(t，K _tx(t ₀)，K _fb(t))+K _tx(t)-K _tx(t ₀)

G in the following formula (8) _Tx(t, K _Tx(t ₀)) what represent is at t moment forward link gain adjustment factor K _Tx(t ₀) remain t ₀Forward link gain when constantly being worth; So with respect to t ₀Constantly, t ₁Transmitting chain gain constantly can be expressed as:

G _Loop(t ₁, K _Tx(t ₀), K _Fb(t ₁))+K _Tx(t ₁)-K _Tx(t ₀)-G _Fb((t ₁), K _Fb(t ₁))=G _Tx(t ₁, K _Tx(t ₁))=G _Tx(t ₀, K _Tx(t ₀)) promptly:

K _tx(t ₁)＝K _tx(t ₀)+G _fb(t ₁，K _fb(t ₁))-G _loop(t ₁，K _tx(t ₀)，K _fb(t ₁))+G _tx(t ₀，K _tx(t ₀))(11)

Because some moment can only obtain the gain of loop in the same moment and the accommodation coefficient of gain of same moment respective links in loop, so G _Loop(t ₁, K _Tx(t ₀), K _Fb(t ₁)) relate to t ₀And t ₁Two moment can't directly read, and must change formula (11), and (7) and (9) formula of utilization obtains:

K _tx(t ₁)＝K _tx(t ₀)+G _fb(t ₁，K _fb(t ₀))-G _fb(t ₀，K _fb(t ₀))+K _fb(t ₁)-K _fb(t ₀)(12)

+G _loop(t ₀，K _tx(t ₀)，K _fb(t ₀))-G _loop(t ₁，K _tx(t ₀)，K _fb(t ₁))

G in the formula (12) _Fb(t ₁, K _Fb(t ₀))-G _Fb(t ₀, K _Fb(t ₀)) what represent is from t ₁To t ₀Environmental factor causes the fluctuation G of based on feedback link gain constantly _Loop(t ₀, K _Tx(t ₀), K _Fb(t ₀)) be t ₀Loop gain can be calculated by formula (4) constantly.G _Loop(t ₁, K _Tx(t ₀), K _Fb(t ₁)) expression be based on t ₀Forward direction K constantly _Tx(t ₀) and based on t ₁Moment K _Fb(t ₁) loop gain, can be at t ₁Constantly calculate by (5).For t ₂Constantly, have equally:

K _tx(t ₂)＝K _tx(t ₀)+G _fb(t ₂，K _fb(t ₀))-G _fb(t ₀，K _fb(t ₀))+K _fb(t ₂)-K _fb(t ₀) (13)+G _loop(t ₀，K _tx(t ₀)，K _fb(t ₀))-G _loop(t ₂，K _tx(t ₀)，K _fb(t ₂))

In (13) because forward direction K _TxBecome K through behind the single compensation _Tx(t ₁), so can't directly obtain G _Loop(t ₂, K _Tx(t ₀), K _Fb(t ₂)), must be converted into K _Tx(t ₁) constantly variable quantity, utilize (10) to obtain

G _loop(t ₂，K _tx(t ₀)，K _fb(t ₂))＝G _loop(t ₂，K _tx(t ₁)，K _fb(t ₂))+K _tx(t ₀)-K _tx(t ₁)

K _tx(t ₂)＝K _tx(t ₁)+G _fb(t ₂，K _fb(t ₀))-G _fb(t ₀，K _fb(t ₀))+K _fb(t ₂)-K _fb(t ₀)(14)+G _loop(t ₀，K _tx(t ₀)，K _fb(t ₀))-G _loop(t ₂，K _tx(t ₁)，K _fb(t ₂))

More general expression formula is:

ΔK _tx(t _n-1→t _n)＝G _fb(t _n，K _fb(t ₀))-G _fb(t ₀，K _fb(t ₀))+K _fb(t _n)-K _fb(t ₀)(15)+G _loop(t ₀，K _tx(t ₀)，K _fb(t ₀))-G _loop(t _n，K _tx(t _n-1)，K _fb(t _n))

Formula (15) is all the time with t ₀Be benchmark constantly, and benchmark t ₀The accommodation coefficient of gain K of corresponding constantly loop gain and corresponding based on feedback link _Fb(t ₀) known, G _Fb(t _n, K _Fb(t ₀))-G _Fb(t ₀, K _Fb(t ₀)) the expression based on feedback link gains along with the variation of environment, can be variations in temperature, also can be aging variable quantity, this variable quantity can obtain in advance by tabling look-up usually.K _Fb(t _n) can in compensation, directly read G _Loop(t _n, K _Tx(t _N-1), K _Fb(t _n)) in the time of compensation, can calculate by (5).Thereby can the amount of being compensated compensate.

Can adopt when reading loop gain in order to simplify (15) in practice, fixedly K _Fb(t _n)=K _Fb(t ₀).

Formula (15) is with t ₀Be benchmark constantly, can adopt the compensation of any moment such as last time to be benchmark constantly in the practice, only need do benchmark corresponding conversion this time, if the gain fluctuation of based on feedback link has before all been obtained compensation, promptly this compensation guarantees that all the time the gain of based on feedback link is fixed on K _Fb(t ₀) constantly, (15) can be expressed as so:

ΔK _tx(t _n-1→t _n)＝G _fb(t _n，K _fb(t _n))-G _fb(t _n-1，(t _n-1))+K _fb(t _n)-K _fb(t _n-1)(16)+G _loop(t ₀，K _tx(t ₀)，K _fb(t ₀))-G _loop(t _n，K _tx(t _n-1)，K _fb(t _n))

Formula (15) and formula (16) have provided the acquisition methods of forward gain variable quantity.

In communication system, numeric field and analog domain have been generally included, so forward link gain adjustment factor K as transmitting chain in the wireless communication system _TxAlso be divided into two parts, a part is regulated in numeric field, and a part is regulated in analog domain.The part of regulating in numeric field can guarantee enough precision, it is interior even lower generally can be controlled at 0.1dB, and in analog domain, regulate as the adjusting numerical-control attenuator, because of its minimal adjustment stepping restriction, generally all can bring bigger error, if directly adopting (15) theory of computation value to be provided with finally must bring than mistake, influenced the precision of final control, therefore the present invention can also comprise the step of calibration, the part of calibration is put into goes in the numeric field to regulate, thereby improved the precision of control.Provide the computational methods of error below.

According to (15) calculating and setting the K of transmitting chain _TxAfter just can guarantee the gain of transmitting chain this moment and benchmark equating constantly in theory.According to (3) benchmark loop gain G constantly _Loop(t ₀) be the gain of forward gain and feedback, forward gain control is constant, so at some moment t _nFinish and read the loop gain G after forward gain is regulated _Loop(t _n), suppose not bring any error in the adjustment of forward gain, following formula is set up so:

G _loop(t _n)-G _loop(t ₀)＝G _fb(t _n，K _fb(t ₀))-G _fb(t ₀，K _fb(t ₀))+K _fb(t _n)-K _fb(t ₀)(17)

Suppose t _nThe error of introducing during forward direction is provided with is E (t _n) then have:

$G\left(t_n\right)-G\left(t_0\right)=G_{\mathrm{fb}}(t_n,K_{\mathrm{fb}}\left(t_0\right))-G_{\mathrm{fb}}({\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="2.png,20101058057421000031.png"\; state="\{\{state\}\}">t</figure-callout>}}_0,K_{\mathrm{fb}}\left(t_0\right))+K_{\mathrm{fb}}\left(t_n\right)-K_{\mathrm{fb}}\left(t_0\right)+E\left(t_n\right)$ (18)

$\&DoubleRightArrow;E\left(t_n\right)=\{G\left(t_n\right)-G\left(t_0\right)\}-\{G_{\mathrm{fb}}(t_n,K_{\mathrm{fb}}\left(t_0\right))-G_{\mathrm{fb}}({\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="2.png,20101058057421000031.png"\; state="\{\{state\}\}">t</figure-callout>}}_0,K_{\mathrm{fb}}\left(t_0\right))+K_{\mathrm{fb}}\left(t_n\right)-K_{\mathrm{fb}}\left(t_0\right)\}$

Just can calculate the error amount that after the n time compensation, brings according to formula (18), this error amount can be compensated to numeric field.

Can finish the process that compensates and calibrate automatically according to formula (15) and (18) by certain processor such as digital signal processor (DSP), microprocessor (Power PC) etc. in the actual compensation, specifically can be referring to Fig. 2, this process comprises the steps:

The accommodation coefficient of gain of step 201, record benchmark loop gain, based on feedback link gain and based on feedback link constantly;

The accommodation coefficient of gain of step 202, the loop gain of reading current time, based on feedback link gain and based on feedback link obtains the change in gain amount that the based on feedback link environmental change causes by lookup table;

The form of being searched is to cause the factor of change in gain and variable quantity form one to one in the transmitting chain;

Step 203, calculate the forward link gain variable quantity according to formula (15);

Step 204, judge whether above-mentioned forward link gain variable quantity is legal, if, execution in step 205, otherwise failure is returned;

Judge that whether legal forward link gain variable quantity this forward link gain variable quantity that is meant whether in the scope that gain allows to adjust;

Step 205, this forward link gain variable quantity is set;

Step 206, read this moment loop gain;

Step 207, calculate error according to formula (18);

Step 208, compensate this error.

By above-mentioned steps 201-208, can finish the compensation of transmitting power in real time, accurately.

To be that example illustrates implementation procedure of the present invention below with the cdma system, as shown in Figure 3, be the emission used in the cdma system of the present invention and the theory diagram of based on feedback link; (Digital PreDistortion, DPD) 31 is as reducing high power amplifier (Power Amplifier, PA) non-linear effects, the key technology of raising PA efficient in the present wireless system to digital pre-distortion among the figure.This technology generally all needs a feedback path, and transmitting chain and based on feedback link have constituted a DPD loop (DPD loop) jointly, and the automatic control of power can be used this loop and be finished.

Before the digital to analog converter in the transmitting chain (DAC) 32 is the multiplier coefficients K of the Gain Adjustable of numeric field correspondence _{Tx_d}, be the COEFFICIENT K of numerical-control attenuator (TX-DATT) 33 correspondences of the Gain Adjustable of analog domain correspondence afterwards _{Tx_a}It is K that the coefficient of corresponding Gain Adjustable numerical-control attenuator (FB-DATT) 34 correspondences is only arranged in analog domain in the based on feedback link _Fb

After system powers on, the output of PA can be configured to given performance number, but along with the variation (only considering variation of temperature in the present embodiment) of system works environment, the loop gain of DPD can change, and the variation of the loop gain that this system temperature variation causes as shown in Figure 4.

The DPD loop is made up of two parts, a part is the variation of forward link gain, a part is the variation of based on feedback link gain, and automatic gain control is the fluctuation that needs the control forward gain, so must from the DPD loop gain, extract the variation of forward link gain, therefore, the link gain that must know feedback is a based on feedback link temperature gain change curve in this system with variation of temperature as shown in Figure 5.

In the present embodiment, the dsp processor in the system when temperature surpasses certain variable quantity as 10 °, promptly starts the automatic control flow chart of gain by the detection system variation of temperature, finishes the compensation of forward gain, and the emitted power fluctuation of control back as shown in Figure 6.

As shown in Figure 7, be the structural representation of the control device of transmitting power of the present invention, this control device comprises: logging modle 71 and compensating module 72, and wherein, logging modle is used to write down benchmark loop gain and based on feedback link gain constantly; Compensating module, the loop gain and the based on feedback link gain that are used to read current time obtain change in gain amount and forward link gain variable quantity that the based on feedback link environmental change causes, and finish compensation.

In order to improve final control precision, this control device can also comprise calibration module 73, and this calibration module is used for after finishing compensation, calculates the error of bringing after the compensation, and calibrates according to described error.

Wherein, described compensating module comprises determining unit and compensating unit, and this determining unit is used for determining the legitimacy of described forward link gain variable quantity after obtaining the forward link gain variable quantity; This compensating unit be used for described determining unit determine described forward link gain variable quantity legal after, compensate.

Preferably, described compensating module can be further used for obtaining the forward link gain variable quantity by the variable quantity computing formula, and described variable quantity computing formula is:

ΔK _tx(t _n-1→t _n)＝G _fb(t _n，K _fb(t ₀))-G _fb(t ₀，K _fb(t ₀))+K _fb(t _n)-K _fb(t ₀)+G _loop(t ₀，K _tx(t ₀)，K _fb(t ₀))-G _loop(t _n，K _tx(t _n-1)，K _fb(t _n))

Wherein, Δ K _Tx(t _N-1→ t _n) be the forward link gain variable quantity, G _Loop(t ₀, K _Tx(t ₀), K _Fb(t ₀)) be t ₀Corresponding constantly loop gain, G _Loop(t _n, K _Tx(t _N-1), K _Fb(t _n)) be t _nCorresponding constantly loop gain, K _Fb(t ₀) be t ₀The accommodation coefficient of gain of the based on feedback link that the moment is corresponding, K _Fb(t _n) be t _nThe accommodation coefficient of gain of the based on feedback link that the moment is corresponding, G _Fb(t ₀, K _Fb(t ₀) be t ₀The gain of based on feedback link correspondence constantly, G _Fb(t _n, K _Fb(t ₀)) be t _nThe gain of based on feedback link correspondence constantly; G _Fb(t _n, K _Fb(t ₀))-G _Fb(t ₀, K _Fb(t ₀)) the change in gain amount that causes for the based on feedback link environmental change.

Described calibration module can be further used for calculating this error by the Error Calculation formula, and this Error Calculation formula is:

E(t _n)＝{G(t _n)-G(t ₀)}-{G _fb(t _n，K _fb(t ₀))-G _fb(t ₀，K _fb(t ₀))+K _fb(t _n)-K _fb(t ₀)}

Wherein, E (t _n) be t _nConstantly finish the error of bringing after the forward direction compensation, G (t ₀) be t ₀Constantly finish the loop gain of reading after forward gain is regulated, G (t _n) be t _nConstantly finish the loop gain of reading after forward gain is regulated, K _Fb(t ₀) be t ₀The accommodation coefficient of gain of the based on feedback link that the moment is corresponding, K _Fb(t _n) be t _nThe accommodation coefficient of gain of the based on feedback link that the moment is corresponding, G _Fb(t ₀, K _Fb(t ₀) be t ₀The gain of based on feedback link correspondence constantly, G _Fb(t _n, K _Fb(t ₀)) be t _nThe gain of based on feedback link correspondence constantly.

Above-mentioned control device can be arranged in processor.

This control device can be finished the compensation of transmitting power in real time, accurately, and its implementation is identical with the control method of transmitting power of the present invention, does not give unnecessary details at this.

One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to finish by program, said procedure can be stored in the computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.

Above embodiment is only unrestricted in order to technical scheme of the present invention to be described, only with reference to preferred embodiment the present invention is had been described in detail.Those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention, and do not break away from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of the claim scope of the present invention.

Claims (10)

1. the control method of a transmitting power is characterized in that, described method comprises:

The accommodation coefficient of gain of record benchmark loop gain, based on feedback link gain and based on feedback link constantly; And

Read the accommodation coefficient of gain of loop gain, based on feedback link gain and the based on feedback link of current time, obtain change in gain amount and forward link gain variable quantity that the based on feedback link environmental change causes, and finish compensation.

2. the control method of transmitting power according to claim 1 is characterized in that, after finishing compensation, described method also comprises:

Calculate the error of bringing after the compensation, and calibrate according to described error.

3. the control method of transmitting power according to claim 1 is characterized in that, after obtaining the forward link gain variable quantity, described method also comprises:

If it is legal to determine described forward link gain variable quantity, then compensate.

4. according to the control method of the described transmitting power of the arbitrary claim of claim 1-3, it is characterized in that change in gain amount and forward link gain variable quantity that the environmental change of described acquisition based on feedback link causes comprise:

Obtain the forward link gain variable quantity by the variable quantity computing formula, described variable quantity computing formula is:

ΔK _tx(t _n-1→t _n)＝G _fb(t _n，K _fb(t ₀))-G _fb(t ₀，K _fb(t ₀))+K _fb(t _n)-K _fb(t ₀)+G _loop(t ₀，K _tx(t ₀)，K _fb(t ₀))-G _loop(t _n，K _tx(t _n-1)，K _fb(t _n))

Wherein, Δ K _Tx(t _N-1→ t _n) be the forward link gain variable quantity, G _Loop(t ₀, K _Tx(t ₀), K _Fb(t ₀)) be t ₀Corresponding constantly loop gain, G _Loop(t _n, K _Tx(t _N-1), K _Fb(t _n)) be t _nCorresponding constantly loop gain, K _Fb(t ₀) be t ₀The accommodation coefficient of gain of the based on feedback link that the moment is corresponding, K _Fb(t _n) be t _nThe accommodation coefficient of gain of the based on feedback link that the moment is corresponding, G _Fb(t ₀, K _Fb(t ₀) be t ₀The gain of based on feedback link correspondence constantly, G _Fb(t _n, K _Fb(t ₀)) be t _nThe gain of based on feedback link correspondence constantly; G _Fb(t _n, K _Fb(t ₀))-G _Fb(t ₀, K _Fb(t ₀)) the change in gain amount that causes for the based on feedback link environmental change.

5. the control method of transmitting power according to claim 2 is characterized in that, the described error of bringing after the compensation that calculates comprises:

Calculate this error by the Error Calculation formula, this Error Calculation formula is:

E(t _n)＝{G(t _n)-G(t ₀)}-{G _fb(t _n，K _fb(t ₀))-G _fb(t ₀，K _fb(t ₀))+K _fb(t _n)-K _fb(t ₀)}

Wherein, E (t _n) be t _nConstantly finish the error of bringing after the forward direction compensation, G (t ₀) be t ₀Constantly finish the loop gain of reading after forward gain is regulated, G (t _n) be t _nConstantly finish the loop gain of reading after forward gain is regulated, K _Fb(t ₀) be t ₀The accommodation coefficient of gain of the based on feedback link that the moment is corresponding, K _Fb(t _n) be t _nThe accommodation coefficient of gain of the based on feedback link that the moment is corresponding, G _Fb(t ₀, K _Fb(t ₀) be t ₀The gain of based on feedback link correspondence constantly, G _Fb(t _n, K _Fb(t ₀)) be t _nThe gain of based on feedback link correspondence constantly.

6. the control device of a transmitting power is characterized in that, described device comprises:

Logging modle is used to write down benchmark loop gain and based on feedback link gain constantly; And

Compensating module, the loop gain and the based on feedback link gain that are used to read current time obtain change in gain amount and forward link gain variable quantity that the based on feedback link environmental change causes, and finish compensation.

7. the control device of transmitting power according to claim 6 is characterized in that, described device also comprises:

Calibration module is used for after finishing compensation, calculates the error of bringing after the compensation, and calibrates according to described error.

8. the control device of transmitting power according to claim 6 is characterized in that, described compensating module comprises:

Determining unit is used for determining the legitimacy of described forward link gain variable quantity after obtaining the forward link gain variable quantity; And

Compensating unit, be used for described determining unit determine described forward link gain variable quantity legal after, compensate.

9. according to the control device of the described transmitting power of the arbitrary claim of claim 6-8, it is characterized in that:

Described compensating module is further used for obtaining the forward link gain variable quantity by the variable quantity computing formula, and described variable quantity computing formula is:

ΔK _tx(t _n-1→t _n)＝G _fb(t _n，K _fb(t ₀))-G _fb(t ₀，K _fb(t ₀))+K _fb(t _n)-K _fb(t ₀)+G _loop(t ₀，K _tx(t ₀)，K _fb(t ₀))-G _loop(t _n，K _tx(t _n-1)，K _fb(t _n))

Wherein, Δ K _Tx(t _N-1→ t _n) be the forward link gain variable quantity, G _Loop(t ₀, K _Tx(t ₀), K _Fb(t ₀)) be t ₀Corresponding constantly loop gain, G _Loop(t _n, K _Tx(t _N-1), K _Fb(t _n)) be t _nCorresponding constantly loop gain, K _Fb(t ₀) be t ₀The accommodation coefficient of gain of the based on feedback link that the moment is corresponding, K _Fb(t _n) be t _nThe accommodation coefficient of gain of the based on feedback link that the moment is corresponding, G _Fb(t ₀, K _Fb(t ₀) be t ₀The gain of based on feedback link correspondence constantly, G _Fb(t _n, K _Fb(t ₀)) be t _nThe gain of based on feedback link correspondence constantly; G _Fb(t _n, K _Fb(t ₀))-G _Fb(t ₀, K _Fb(t ₀)) the change in gain amount that causes for the based on feedback link environmental change.

10. the control device of transmitting power according to claim 7 is characterized in that:

Described calibration module is further used for calculating this error by the Error Calculation formula, and this Error Calculation formula is:

E(t _n)＝{G(t _n)-G(t ₀)}-{G _fb(t _n，K _fb(t ₀))-G _fb(t ₀，K _fb(t ₀))+K _fb(t _n)-K _fb(t ₀)}

Wherein, E (t _n) be t _nConstantly finish the error of bringing after the forward direction compensation, G (t ₀) be t ₀Constantly finish the loop gain of reading after forward gain is regulated, G (t _n) be t _nConstantly finish the loop gain of reading after forward gain is regulated, K _Fb(t ₀) be t ₀The accommodation coefficient of gain of the based on feedback link that the moment is corresponding, K _Fb(t _n) be t _nThe accommodation coefficient of gain of the based on feedback link that the moment is corresponding, G _Fb(t ₀, K _Fb(t ₀) be t ₀The gain of based on feedback link correspondence constantly, G _Fb(t _n, K _Fb(t ₀)) be t _nThe gain of based on feedback link correspondence constantly.

Images