CN102026349B - 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, ensures that the power stability transmitting is very important in communication system.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 covering.For improve power system capacity with reduce communicate by letter in appearance blind area, generally all require in be stabilized in ± 2dB of transmitting power.

In order to ensure the stable of transmitting power, must compensate less desirable gain fluctuation in whole transmitting chain by certain mechanism.For example, the gain fluctuation of transmitting chain or the aging gain fluctuation causing of device that cause along with the variation of temperature.In current communication system, have the process of the calibration of power, object is by calibration, shifts the power of antenna opening onto a desired value in some moment, as 40W, and 60W etc., this process is also referred to as calibration.

But calibration is only in some moment, and non real-time carrying out, it cannot compensate the fluctuation of the antenna opening gain occurring along with environmental change, so must set up a kind of real-time mechanism and complete the compensation of 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 complete in real time the compensation of transmitting power.

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

Record the accommodation coefficient of gain of loop gain, feedback link gain and the feedback link in benchmark moment;

The accommodation coefficient of gain of reading loop gain, feedback link gain and the feedback link of current time, obtains change in gain amount and forward link gain variable quantity that feedback link environmental change causes, and completes compensation.

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

After completing compensation, described method also comprises:

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

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

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

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

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

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

Obtain forward link gain variable quantity by 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 forward link gain variable quantity, G _loop(t ₀, K _tx(t ₀), K _fb(t ₀)) be t ₀the loop gain that moment is corresponding, G _loop(t _n, K _tx(t _n-1), K _fb(t _n)) be t _nthe loop gain that moment is corresponding, K _fb(t ₀) be t ₀the accommodation coefficient of gain of feedback link corresponding to moment, K _fb(t _n) be t _nthe accommodation coefficient of gain of feedback link corresponding to moment, G _fb(t ₀, K _fb(t ₀) be t ₀the gain that moment feedback link is corresponding, G _fb(t _n, K _fb(t ₀)) be t _nthe gain that moment feedback link is corresponding; G _fb(t _n, K _fb(t ₀))-G _fb(t ₀, K _fb(t ₀)) the change in gain amount that causes for feedback link environmental change.

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

The described error of bringing after compensation that calculates comprises:

Calculate this error by 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 _nmoment is finished the error of bringing after pre-compensation, G (t ₀) be t ₀moment is finished the loop gain of reading after forward gain regulates, G (t _n) be t _nmoment is finished the loop gain of reading after forward gain regulates, K _fb(t ₀) be t ₀the accommodation coefficient of gain of feedback link corresponding to moment, K _fb(t _n) be t _nthe accommodation coefficient of gain of feedback link corresponding to moment, G _fb(t ₀, K _fb(t ₀) be t ₀the gain that moment feedback link is corresponding, G _fb(t _n, K _fb(t ₀)) be t _nthe gain that moment feedback link is corresponding.

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

Logging modle, for recording loop gain and the feedback link gain in benchmark moment; And

Compensating module, for reading loop gain and the feedback link gain of current time, obtains change in gain amount and forward link gain variable quantity that feedback link environmental change causes, and completes compensation.

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

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

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

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

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

Described compensating module, is further used for obtaining forward link gain variable quantity by 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 forward link gain variable quantity, G _loop(t ₀, K _tx(t ₀), K _fb(t ₀)) be t ₀the loop gain that moment is corresponding, G _loop(t _n, K _tx(t _n-1), K _fb(t _n)) be t _nthe loop gain that moment is corresponding, K _fb(t ₀) be t ₀the accommodation coefficient of gain of feedback link corresponding to moment, K _fb(t _n) be t _nthe accommodation coefficient of gain of feedback link corresponding to moment, G _fb(t ₀, K _fb(t ₀) be t ₀the gain that moment feedback link is corresponding, G _fb(t _n, K _fb(t ₀)) be t _nthe gain that moment feedback link is corresponding; G _fb(t _n, K _fb(t ₀))-G _fb(t ₀, K _fb(t ₀)) the change in gain amount that causes for feedback link environmental change.

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

Described calibration module, is further used for calculating this error by 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 _nmoment is finished the error of bringing after pre-compensation, G (t ₀) be t ₀moment is finished the loop gain of reading after forward gain regulates, G (t _n) be t _nmoment is finished the loop gain of reading after forward gain regulates, K _fb(t ₀) be t ₀the accommodation coefficient of gain of feedback link corresponding to moment, K _fb(t _n) be t _nthe accommodation coefficient of gain of feedback link corresponding to moment, G _fb(t ₀, K _fb(t ₀) be t ₀the gain that moment feedback link is corresponding, G _fb(t _n, K _fb(t ₀)) be t _nthe gain that moment feedback link is corresponding.

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

Brief description of the drawings

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

Fig. 2 is the flow chart that the present invention completes compensation and calibration process automatically;

Fig. 3 is the transmitting that uses in cdma system of the present invention and the theory diagram of feedback link;

Fig. 4 is the curve chart that system temperature of the present invention changes the loop gain fluctuation causing;

Fig. 5 is the curve chart that system temperature of the present invention changes the feedback link gain fluctuation causing;

Fig. 6 is the curve chart of launching power fluctuation under 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

Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.

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

Step 1, the loop gain that records the benchmark moment and feedback link gain;

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

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

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

The control method of transmitting power may be summarized to be two kinds: one is open loop control, and one is closed-loop control.Open loop control refers to obtain in advance and in transmitting chain, may cause the factor of change in gain and the form one to one of variable quantity, and then in system employs, moment monitoring causes the variation of the factor of change in gain, then tables look-up and compensates.For example, can obtain in advance temperature on transmitting chain, with the relation of change in gain, then compensates according to the variation of temperature.Closed-loop control is without the variable quantity that obtains in advance transmitting chain gain, but controls by the method for real-time detection.

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 _ethe power coupling ratio that is referred to as to be transmitted into feedback, this value is generally constant, so the gain of feedback link can variable coefficient unification be K _fb.In Fig. 1, can calculate the loop gain G of any time _loop, G _loopcomprised the variation of forward direction and feedback link gain, the core concept that transmitting power is controlled is automatically exactly in the situation that knowing loop gain and feedback link gain, extracts the undulate quantity in some moment of forward link gain, then by regulating K _txcompensate, maintain the gain constant of transmitting chain.

Run to some moment in system and power on as system, transmitting power can be by the mechanism control of some calibrations in some values, and this process is referred to as calibration, claims that this moment is the benchmark moment, uses t ₀represent t ₀in time chart 1, the power of each point is all referred to as reference power.

Automatically the object of power ratio control is that guarantee system ensures that in running the gain constant of transmitting chain is t all the time ₀moment yield value, supposes t ₀the gain that moment transmitting chain is corresponding is G _tx(t ₀), gain corresponding to feedback link is G simultaneously _fb(t ₀), for the ease of calculate, below power unit be dBm, the unit of gain is dB:

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)

In Fig. 1, the gain of whole loop can be used P _fb-P _inrepresent, t ₀the loop gain in moment 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) without loss of generality, can obtain the gain of transmitting chain, and the pass between loop gain and feedback oscillator is:

G _tx(t)＝G _loop(t)-G _fb(t) (5)

The object of power ratio control is to maintain the gain constant of transmitting chain at t ₀moment, so if think at a time, t still keeps the gain constant of transmitting chain is t ₀moment yield value, just must obtain moment t contrast t ₀the change in gain amount of moment transmitting chain, and this variable quantity is passed through to regulate K _txcompensate, the following describes and how to obtain K _txvariable quantity.

The gain of the middle forward direction of formula (5) and feedback is all relevant to accommodation coefficient of gain K on time t and link, is the function of time and accommodation coefficient of gain; So forward direction and 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 above formula _loop(t, K _tx(t), K _fb(t) value) can calculate in the t moment according to formula (3); For forward gain is remained unchanged, any moment G _tx(t, K _tx(t)) must maintain t ₀the value in moment, 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 ₀moment is benchmark, and link gain can be determined by two factors at the variable quantity in t moment so: first is that link gain is along with the variation of environment produces with respect to t ₀the change in gain in moment, second is because gain coefficient is with respect to t ₀the variation (as gain coefficient in gain is controlled can usually be adjusted for power back-off) in moment, now 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 above 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 moment is worth; So with respect to t ₀moment, t ₁the transmitting chain gain in moment 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)):

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 in loop can only obtain the gain of the loop in same moment and the accommodation coefficient of gain of same moment respective links, so G _loop(t ₁, K _tx(t ₀), K _fb(t ₁)) relate to t ₀and t ₁in two moment, cannot 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 formula (12) _fb(t ₁, K _fb(t ₀))-G _fb(t ₀, K _fb(t ₀)) what represent is from t ₁to t ₀moment environmental factor causes the fluctuation G of feedback link gain _loop(t ₀, K _tx(t ₀), K _fb(t ₀)) be t ₀moment loop gain, can be calculated by formula (4).G _loop(t ₁, K _tx(t ₀), K _fb(t ₁)) what represent is based on t ₀the forward direction K in moment _tx(t ₀) and based on t ₁moment K _fb(t ₁) loop gain, can be at t ₁moment is calculated by (5).For t ₂in the moment, 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) due to forward direction K _txafter single compensation, become K _tx(t ₁), so cannot directly obtain G _loop(t ₂, K _tx(t ₀), K _fb(t ₂)), must be converted into K _tx(t ₁) variable quantity in moment, 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 ₀moment is benchmark, and benchmark t ₀the accommodation coefficient of gain K of the loop gain that the moment is corresponding and corresponding feedback link _fb(t ₀) known, G _fb(t _n, K _fb(t ₀))-G _fb(t ₀, K _fb(t ₀)) represent the variation of feedback link gain along with environment, can be variations in temperature, can be also aging variable quantity, this variable quantity can obtain in advance by tabling look-up conventionally.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 in reading loop gain in practice fixing K in order to simplify (15) _fb(t _n)=K _fb(t ₀).

Formula (15) is with t ₀moment is benchmark, in practice, can adopt any moment is benchmark as compensated the moment last time, only need to do benchmark corresponding conversion this time, if the gain fluctuation of feedback link before has all been obtained to compensation, i.e. this compensation ensures that the gain of feedback link is fixed on K all the time _fb(t ₀) moment, (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 as transmitting chain in wireless communication system has generally included numeric field and analog domain, so forward link gain adjustment factor K _txalso be divided into two parts, a part regulates in numeric field, and a part regulates in analog domain.The part regulating in numeric field can ensure enough precision, generally can be controlled in 0.1dB even lower, and in analog domain, regulate as adjusting numerical-control attenuator, because of its minimal adjustment stepping restriction, generally all can bring larger error, finally must bring larger error if directly adopt (15) theory of computation value to arrange, affect the precision of final control, therefore the present invention can also comprise the step of calibration, the part of calibration is put in numeric field and goes to regulate, thereby improved the precision of controlling.Provide the computational methods of error below.

According to (15) calculating and setting the K of transmitting chain _txafter just can ensure in theory the gain of transmitting chain this moment and equating of benchmark moment.According to (3) the loop gain G in benchmark moment _loop(t ₀) be the gain of forward gain and feedback, forward gain control is constant, so at some moment t _nfinish after forward gain regulates and read loop gain G _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 that forward direction arranges middle introducing is E (t _n) have:

$G\left(t_n\right)-G\left(t_0\right)=G_{\mathrm{fb}}(t_n,K_{\mathrm{fb}}\left(t_0\right))-G_{\mathrm{fb}}(t_0,K_{\mathrm{fb}}\left(t_0\right))+K_{\mathrm{fb}}\left(t_n\right)-K_{\mathrm{fb}}\left(t_0\right)+E\left(t_n\right)$ (18)

$\⇒E\left(t_n\right)=\{G\left(t_n\right)-G\left(t_0\right)\}-\{G_{\mathrm{fb}}(t_n,K_{\mathrm{fb}}\left(t_0\right))-G_{\mathrm{fb}}(t_0,K_{\mathrm{fb}}\left(t_0\right))+K_{\mathrm{fb}}\left(t_n\right)-K_{\mathrm{fb}}\left(t_0\right)\}$

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

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

The accommodation coefficient of gain of step 201, the loop gain that records the benchmark moment, feedback link gain and feedback link;

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

The form of searching is factor and the variable quantity form one to one that causes change in gain in transmitting chain;

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

Step 204, judge that whether above-mentioned forward link gain variable quantity is legal, if so, perform step 205, otherwise, unsuccessfully return;

Judging whether forward link gain variable quantity is legal refers in the scope whether this forward link gain variable quantity allow to adjust in gain;

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

Step 206, read now loop gain;

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

Step 208, compensate this error.

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

Below will taking cdma system as example illustrates implementation procedure of the present invention, as shown in Figure 3, be the transmitting that uses in cdma system of the present invention and the theory diagram of feedback link; Digital pre-distortion in figure (Digital PreDistortion, DPD) the 31st, as reducing high power amplifier (Power Amplifier, PA) non-linear effects, improves the key technology of PA efficiency in current wireless system.This technology generally all needs a feedback path, and transmitting chain and feedback link have formed a DPD loop (DPD loop) jointly, and the automatic control of power can be used this loop and be completed.

Before digital to analog converter in transmitting chain (DAC) 32, be the adjustable multiplier coefficients K of gain that numeric field is corresponding _{tx_d}, be the COEFFICIENT K of adjustable numerical-control attenuator (TX-DATT) 33 correspondences of gain that analog domain is corresponding afterwards _{tx_a}.In feedback link, only in analog domain, having the coefficient of the adjustable numerical-control attenuator of corresponding gain (FB-DATT) 34 correspondences is K _fb.

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

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

In the present embodiment, the dsp processor in system, by the variation of detection system temperature, in the time that temperature exceedes certain variable quantity as 10 °, starts the automatic control flow chart of gain, completes the compensation of forward gain, and after controlling, the power fluctuation of transmitting 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, wherein, logging modle, for recording loop gain and the feedback link gain in benchmark moment; Compensating module, for reading loop gain and the feedback link gain of current time, obtains change in gain amount and forward link gain variable quantity that feedback link environmental change causes, and completes compensation.

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

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

Preferably, described compensating module can be further used for obtaining forward link gain variable quantity by 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 forward link gain variable quantity, G _loop(t ₀, K _tx(t ₀), K _fb(t ₀)) be t ₀the loop gain that moment is corresponding, G _loop(t _n, K _tx(t _n-1), K _fb(t _n)) be t _nthe loop gain that moment is corresponding, K _fb(t ₀) be t ₀the accommodation coefficient of gain of feedback link corresponding to moment, K _fb(t _n) be t _nthe accommodation coefficient of gain of feedback link corresponding to moment, G _fb(t ₀, K _fb(t ₀) be t ₀the gain that moment feedback link is corresponding, G _fb(t _n, K _fb(t ₀)) be t _nthe gain that moment feedback link is corresponding; G _fb(t _n, K _fb(t ₀))-G _fb(t ₀, K _fb(t ₀)) the change in gain amount that causes for feedback link environmental change.

Described calibration module can be further used for calculating this error by 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 _nmoment is finished the error of bringing after pre-compensation, G (t ₀) be t ₀moment is finished the loop gain of reading after forward gain regulates, G (t _n) be t _nmoment is finished the loop gain of reading after forward gain regulates, K _fb(t ₀) be t ₀the accommodation coefficient of gain of feedback link corresponding to moment, K _fb(t _n) be t _nthe accommodation coefficient of gain of feedback link corresponding to moment, G _fb(t ₀, K _fb(t ₀) be t ₀the gain that moment feedback link is corresponding, G _fb(t _n, K _fb(t ₀)) be t _nthe gain that moment feedback link is corresponding.

Above-mentioned control device can be arranged in processor.

This control device can complete 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, is not repeated herein.

One of ordinary skill in the art will appreciate that all or part of step in said method can carry out instruction related hardware by program and complete, said procedure can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, the each module/unit in above-described embodiment can adopt the form of hardware to realize, and 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 modify or be equal to replacement technical scheme of the present invention, and do not depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of claim scope of the present invention.

Claims (8)

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

Record the accommodation coefficient of gain of loop gain, feedback link gain and the feedback link in benchmark moment; And

The accommodation coefficient of gain of reading loop gain, feedback link gain and the feedback link of current time, obtains change in gain amount and forward link gain variable quantity that feedback link environmental change causes, and completes compensation;

Wherein, change in gain amount and forward link gain variable quantity that the environmental change of described acquisition feedback link causes comprise: obtain forward link gain variable quantity by 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 forward link gain variable quantity, G _loop(t ₀, K _tx(t ₀), K _fb(t ₀)) be t ₀the loop gain that moment is corresponding, G _loop(t _n, K _tx(t _n-1), K _fb(t _n)) be t _nthe loop gain that moment is corresponding, K _fb(t ₀) be t ₀the accommodation coefficient of gain of feedback link corresponding to moment, K _fb(t _n) be t _nthe accommodation coefficient of gain of feedback link corresponding to moment, G _fb(t ₀, K _fb(t ₀) be t ₀the gain that moment feedback link is corresponding, G _fb(t _n, K _fb(t ₀)) be t _nthe gain that moment feedback link is corresponding; G _fb(t _n, K _fb(t ₀))-G _fb(t ₀, K _fb(t ₀)) the change in gain amount that causes for feedback link environmental change.

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

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

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

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

4. the control method of transmitting power according to claim 2, is characterized in that, described in calculate the error of bringing after compensation and comprise:

Calculate this error by 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 _nmoment is finished the error of bringing after pre-compensation, G (t ₀) be t ₀moment is finished the loop gain of reading after forward gain regulates, G (t _n) be t _nmoment is finished the loop gain of reading after forward gain regulates, K _fb(t ₀) be t ₀the accommodation coefficient of gain of feedback link corresponding to moment, K _fb(t _n) be t _nthe accommodation coefficient of gain of feedback link corresponding to moment, G _fb(t ₀, K _fb(t ₀) be t ₀the gain that moment feedback link is corresponding, G _fb(t _n, K _fb(t ₀)) be t _nthe gain that moment feedback link is corresponding.

5. a control device for transmitting power, is characterized in that, described device comprises:

Logging modle, for recording loop gain and the feedback link gain in benchmark moment; And

Compensating module, for reading loop gain and the feedback link gain of current time, obtains change in gain amount and forward link gain variable quantity that feedback link environmental change causes, and completes compensation; Wherein said forward link gain variable quantity obtains by 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 forward link gain variable quantity, G _loop(t ₀, K _tx(t ₀), K _fb(t ₀)) be t ₀the loop gain that moment is corresponding, G _loop(t _n, K _tx(t _n-1), K _fb(t _n)) be t _nthe loop gain that moment is corresponding, K _fb(t ₀) be t ₀the accommodation coefficient of gain of feedback link corresponding to moment, K _fb(t _n) be t _nthe accommodation coefficient of gain of feedback link corresponding to moment, G _fb(t ₀, K _fb(t ₀) be t ₀the gain that moment feedback link is corresponding, G _fb(t _n, K _fb(t ₀)) be t _nthe gain that moment feedback link is corresponding; G _fb(t _n, K _fb(t ₀))-G _fb(t ₀, K _fb(t ₀)) the change in gain amount that causes for feedback link environmental change.

6. the control device of transmitting power according to claim 5, is characterized in that, described device also comprises:

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

7. the control device of transmitting power according to claim 5, is characterized in that, described compensating module comprises:

Determining unit, for after obtaining forward link gain variable quantity, determines the legitimacy of described forward link gain variable quantity; And

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

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

Described calibration module, is further used for calculating this error by 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 _nmoment is finished the error of bringing after pre-compensation, G (t ₀) be t ₀moment is finished the loop gain of reading after forward gain regulates, G (t _n) be t _nmoment is finished the loop gain of reading after forward gain regulates, K _fb(t ₀) be t ₀the accommodation coefficient of gain of feedback link corresponding to moment, K _fb(t _n) be t _nthe accommodation coefficient of gain of feedback link corresponding to moment, G _fb(t ₀, K _fb(t ₀) be t ₀the gain that moment feedback link is corresponding, G _fb(t _n, K _fb(t ₀)) be t _nthe gain that moment feedback link is corresponding.