CN104113382B - Wireless transmitting system and determine the method for preset gain of wireless transmitting system - Google Patents
Wireless transmitting system and determine the method for preset gain of wireless transmitting system Download PDFInfo
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Abstract
A kind of wireless transmitting system and determine the method for preset gain of wireless transmitting system.This wireless transmitting system comprises signal transmission path and the signal feedback path being coupled to signal transmission path.This signal transmission path comprises power amplification circuit and has the gain stage of multiple transmission gain.The method comprises: the specific transmission gain gain of this gain stage being set as in the plurality of transmission gain；Sequentially transmit multiple test signal to produce the test signal after multiple amplifications via this signal transmission path, the energy of the most the plurality of test signal corresponds respectively to the plurality of transmission gain at least partially；Via the test signal after this signal the plurality of amplification of feedback path received in sequence, obtain corresponding multiple signal gains according to this；And the preset gain of this gain stage is determined according to the plurality of signal gain.
Description
Technical field
The present invention relates to radio communication, a kind of utilize self correcting mechanism determine a wireless transmitting system preset
The method of gain and its relevant wireless transmitting system.
Background technology
In wireless system (wireless system), transmitter (transmitter) performance and signal chains (signal
Chain) rf gain block (RF gain block) among, high power amplifier (high power amplifier,
HPA), matching network (matching network) and other outer members have the biggest relation.To having same wireless
When the transmitter of design is tested, typically can expect and can obtain good and consistent performance, but, the most not
So, this is because the most perfect absolute gain accuracy specifications (absolute gain can be provided almost without element
Accuracy specification), and radiofrequency characteristics curve (RF characteristics) is generally as well as difference
Element and change.It addition, the gain of signal chains changes as well as temperature and frequency.
Transmitter performance generally can be exported with radio frequency by error vector magnitude (error vector magnitude, EVM)
Relation between power is used as assessing foundation.Referring to Fig. 1, it is error vector magnitude and the output of multiple transmitter A～C
Relation schematic diagram between power.As shown in Figure 1, for transmitter B and transmitter C, owing to transmitter C is identical
Under radio frequency power output, it can reach minimum error vector magnitude, therefore transmitter C has optimum performance.Come from another point of view
Say, for the code requirement (that is, the error vector magnitude of transmission signal need to be less than a reference value) of transmitter to be met, multiple
The exportable peak power of transmitter A～C is different.
Accordingly, it would be desirable to the method that (calibration) can be tested and be corrected to transmitter by one, to guarantee transmitter
Operate in suitable working range, make the output of transmission signal enough greatly and have good signal quality.
Summary of the invention
In view of this, an object of the present invention is to provide one to utilize self correcting mechanism to be wirelessly transferred
The method of the preset gain of system and its relevant wireless transmitting system, solve the problems referred to above.
According to one embodiment of the invention, it discloses the side of a kind of preset gain for determining a wireless transmitting system
Method.This wireless transmitting system comprises a signal transmission path and a signal feedback path.This signal feedback path is coupled to this
Signal transmission path.This signal transmission path comprises a gain stage and a power amplification circuit.This gain stage has multiple biography
Defeated gain.The method includes the steps of: the gain of this gain stage is set as the specific biography of among the plurality of transmission gain
Defeated gain；Under this specific transmission gain, sequentially transmit multiple test signal via this signal transmission path many to produce
Test signal after individual amplification, corresponds respectively to the plurality of transmission at least partially and increases in the energy of the most the plurality of test signal
Benefit；Carry out the test signal after the plurality of amplification of received in sequence via this signal feedback path, and obtain corresponding multiple according to this
Signal gain；And the preset gain of this gain stage is determined according to the plurality of signal gain.
According to one embodiment of the invention, it discloses a kind of wireless transmitting system.This wireless transmitting system comprises a signal
Transmit path, a signal feedback path, a control unit, a signal generation unit and a signal processing unit.This signal passes
Path is sent to comprise a gain stage and a power amplification circuit.This gain stage has multiple transmission gain.This signal feedback path
It is coupled to this signal transmission path.This control unit is in order to be set as the gain of this gain stage among the plurality of transmission gain
One specific transmission gain.This signal generation unit is coupled to this signal transmission path, in order to produce multiple test signal, and at this
Under specific transmission gain, sequentially transmit the plurality of test signal to produce after multiple amplifications via this signal transmission path
Test signal, corresponds respectively to the plurality of transmission gain in the energy of the most the plurality of test signal at least partially.This signal
Processing unit is coupled to this signal feedback path, in order to receive the letter of the test after the plurality of amplification via this signal feedback path
Number, and obtain corresponding multiple signal gains according to this, and determine presetting of this gain stage according to the plurality of signal gain
Gain.
The method determining preset gain provided by the present invention can make wireless transmitting system carry out self-correction, so that it is pre-
It is located at suitable working region, not only meets the specification of error vector magnitude, and exportable enough outputs, therefore can promote
Transmitter spectral performance, saves the running cost of power amplifier the most in a large number.Furthermore, self-correction machine provided by the present invention
System, can remove use external circuit from and carry out testing radio transmission performance, reduce manpower and time cost.
Accompanying drawing explanation
Fig. 1 is the relation schematic diagram between error vector magnitude and the output of multiple transmitter.
Fig. 2 is the relation schematic diagram between input power and the gain of power amplifier.
Fig. 3 is the function block schematic diagram of an embodiment of the wireless transmitting system of broad sense of the present invention.
Fig. 4 is the control unit shown in Fig. 3 controls bit set and right between the transmission gain that gain stage is provided
The schematic diagram of the implementation example that should be related to.
Fig. 5 is the schematic diagram of an embodiment of wireless transmitting system of the present invention.
Fig. 6 is the flow chart of an embodiment of the method for signal calculated gain of the present invention.
Fig. 7 is the relation schematic diagram between index value and the corresponding signal gain of the test signal shown in Fig. 5.
Fig. 8 is that basis signal gain of the present invention is to determine the flow process of an embodiment of the method for the preset gain of gain stage
Figure.
Fig. 9 is that the basis signal gain shown in Fig. 8 is to determine an implementation example of the method for the preset gain of gain stage
Flow chart.
Figure 10 is the stream that the present invention determines an embodiment of the method for the preset gain of gain stage according to least gain difference
Cheng Tu.
Symbol description
300,500 wireless transmitting system
302,502 signal transmission path
308,508_1,508_2 gain stage
316 power amplification circuits
322,522 signal feedback path
330 control units
340,540 signal generation unit
350,550 signal processing unit
360, ANT antenna
504_1,504_2 digital analog converter
506_1,506_2,527_1,527_2 low pass filter
510_1,510_2,525_1,525_2 frequency mixer
512,526 local oscillator
514 adders
PA radio-frequency power amplifier
524 attenuators
528_1,528_2 analog-digital converter
540_1,540_2 signal generating circuit
552 gain calculating circuit
A, B, C transmitter
Detailed description of the invention
When wireless transmitting system operates in large transmission power, its corresponding error vector magnitude can be with power amplifier
Non-linear (non-linear) characteristic curve of (power amplifier, PA) has the relevant of height.Referring to Fig. 2, it is merit
Relation schematic diagram between input power and the gain of rate amplifier.As shown in Figure 2, the gain of power amplifier is in input power
In linear zone (that is, be less than power IP0Almost can keep fixing in), but, when input power enter inelastic region (that is,
More than power IP0) time, its corresponding gain can start decay, say, that corresponding output can not as expected,
Additionally, the error vector magnitude corresponding to output also can start to be significantly increased.
Typically reduce by 1 decibel (decibel, dB) (compared to linear zone input power with the gain of detection power amplifier
Corresponding gain) time corresponding input power P1dB, it is used as assessing the foundation of power amplifier properties.Work as power amplification
The output of device is more than input power P1dBDuring corresponding output, transmission performance can fall into a decline (such as, output work
Rate is the most as expected).Therefore, idea of the invention is i.e. at the self-correction of the prime circuit gain by controlling power amplifier
(self-calibration) mechanism, makes the operation of power amplifier can be preset in suitable input power range, with satisfied mistake
The specification of difference vector amplitude, and then guarantee to transmit the quality of signal.It is described as follows further.
Referring to Fig. 3, it is the function block schematic diagram of an embodiment of wireless transmitting system of broad sense of the present invention.Wireless
Transmission system (wireless transmission system) 300 comprise signal transmission path 302, control unit 330,
One signal generation unit 340 and an antenna (antenna) 360, wherein signal transmission path 302 comprises a gain stage (gain
Stage) 308 and a power amplification circuit 316.When carrying out signal transmission, transmission signal is via signal transmission path 302
Amplify, and send it by antenna 360.The output of wireless transmitting system 300 is mainly by gain stage 308 and power amplification
The gain that circuit 316 provides respectively determines, wherein gain stage 308 has multiple transmission gain (transmission
Gain), and the demand/consideration of the visual actual application of control unit 330 sets the gain of gain stage 308.
In general, the available bit that controls of control unit 330 sets the gain of gain stage 308.Please join together with Fig. 3
Read Fig. 4.Fig. 4 is the control unit 330 shown in Fig. 3 controls bit set and between the transmission gain that gain stage 308 is provided
The schematic diagram of an implementation example of corresponding relation.In this implementation example, control unit 330 can be controlled buffer by one
(control register) carrys out implementation and goes out, and has 4 and control bits, its in order to the gain of gain stage 308 is set as-
9 decibels～+6 decibels.
Owing to when the gain of gain stage 308 is excessive, power amplification circuit 316 may be made to operate in inelastic region, because of
This, wireless transmitting system 300 additionally comprises a signal feedback path (signal feedback path) 322 and a signal processing
Unit 350, in order to obtain transmission characteristic (such as, the pass between input power with corresponding gain of power amplification circuit 316
System), and then determine the preset gain of gain stage 308.Consequently, it is possible to power amplification circuit 316 is operable in suitable working area
Territory (such as, input power P shown in Fig. 21dBIn), transmission signal not only can be made to meet the specification of error vector magnitude, and have
Enough outputs are available for subsequent applications.
Specifically, when wireless transmitting system 300 carries out self-correction, control unit 330 can be by the increasing of gain stage 308
Benefit is set as the specific transmission gain of among the plurality of transmission gain, and signal generation unit 340 then can produce N number of test letter
Number S_T1～S_TN, and sequentially transmit it via signal transmission path 302, to produce the test signal S_A after N number of amplification1~
S_AN, the most N number of test signal S_T1～S_TNEnergy at least part of correspond respectively to the plurality of transmission gain.
It follows that the test signal S_A after N number of amplification1～S_ANCan receive via signal feedback path 322, and according to this
Produce N number of feedback signal S_F1～S_FN.Signal processing unit 350 then can N number of feedback signal S_F of received in sequence1～S_FNCome
To corresponding multiple signal gains.Finally, signal processing unit 350 just can determine gain stage according to the plurality of signal gain
The preset gain of 308.For example, signal processing unit 350 can obtain the increasing of the plurality of signal according to the plurality of signal gain
Beneficial with N number of test signal S_T1～S_TNBetween corresponding relation, and with reference to test signal energy and transmission gain between
Corresponding relation determines suitable transmission gain, using the preset gain as gain stage 308.
Below to use string ripple signal as the implementation example of test signal, illustrate that the present invention has self correcting mechanism
The details of operation of wireless transmitting system.Referring to Fig. 5, it is the schematic diagram of an embodiment of wireless transmitting system of the present invention.
The framework of wireless transmitting system 500 framework based on the wireless transmitting system 300 shown in Fig. 3.Wireless transmitting system 500 comprises one
Signal transmission path 502, one signal feedback path 522, signal generation unit 540, signal processing unit 550 and one day
Line ANT.In this embodiment, signal generation unit 540 can produce N number of test signal S_T1～S_TN, each of which test letter
Number include cosine signal produced by signal generating circuit 540_1 (cosine signal) and signal generating circuit 540_2
Produced sinusoidal signal (sine signal).Signal transmission path 502 comprises multiple digital analog converter (digital-
To-analog converter, DAC) 504_1～504_2, multiple low pass filter (low-pass filter, LPF) 506_1
～506_2, multiple gain stage 508_1～508_2, multiple frequency mixer (mixer) 510_1～510_2, a local oscillator
(local oscillator, LO) 512, one adder (summer) 514 and radio-frequency power amplifier PA, wherein a gain stage
508_1/508_2 can be used to implementation and goes out the gain stage 308 shown in Fig. 3, and radio-frequency power amplifier PA can be used to implementation and goes out Fig. 3
Shown power amplification circuit 316.
Succinct for purposes of explanation, in this embodiment, gain stage 508_1 and the transmission gain of gain stage 508_2 and control bit
Corresponding relation between unit sets all uses the corresponding relation shown in Fig. 4.It addition, the produced test of signal generation unit 540
The number of signal is equal to the number (that is, N is equal to 16) of the transmission gain of gain stage 508_1/508_2, and signal produces single
Unit 540 transmits N number of test signal S_T according to by the order of least energy to ceiling capacity1～S_TN, the most adjacent two surveys
The energy difference of trial signal is 1 decibel (that is, equal to the increasing between adjacent two transmission gains among gain stage 508_1/508_2
Benefit is poor).It is to say, signal generating circuit 540_1 can sequentially transmit multiple cosine signal S_TC1～S_TCN(energy is with 1 decibel
It is incremented by), and signal generating circuit 540_2 can sequentially transmit multiple sinusoidal signal S_TS1～S_TSN(energy is passed with 1 decibel
Increase).Therefore, N number of test signal S_T is sequentially transmitted by signal transmission path 5021～S_TN, be equivalent to increase in difference transmission
Under benefit, transmit a test signal by signal transmission path 502.
When wireless transmitting system 500 proceeds by self-correction, can be first by gain stage 508_1 and gain stage 508_2
Gain is all set as maximum transmitted gain.Signal generation unit 540 then can sequentially transmit N number of cosine signal S_TC1～S_TCN,
Each of which cosine signal all can be via digital analog converter 504_1, low pass filter 506_1 and gain stage 508_1
And the signal of frequency mixer 510_1(and local oscillator 512 is mixed) it is sent to adder 514.N number of sinusoidal signal S_
TS1～S_TSNAlso adder 514 can be sent to via similar process.Adder 514 can be by sinusoidal signal with corresponding
Cosine signal is added, sequentially to produce N number of input signal S_I1～S_IN.Input is the most sequentially believed by radio-frequency power amplifier PA
Number S_I1～S_INAmplify, to produce the test signal S_A after N number of amplification1～S_AN.Due to those of ordinary skill in the art
It should be appreciated that multiple digital analog converter 504_1 Yu 504_2, multiple low pass filter 506_1 Yu 506_2, multiple frequency mixer
The relevant operational details of 510_1 to 510_2, local oscillator 512 and adder 514, therefore further instruction is at this most not
Repeat again.
It follows that signal processing unit 550 can receive the test signal after N number of amplification via signal feedback path 522
S_A1～S_AN, wherein signal feedback path 522 comprise an attenuator (attenuator) 524, multiple frequency mixer 525_1～
525_2, a local oscillator 526, multiple low pass filter 527_1～527_2 and analog-digital converter (analog-to-
Digital converter, ADC) 528_1～528_2.Attenuator 524 can be used to decay the test signal S_A after N number of amplification1
～S_AN, to meet the power input range of subsequent treatment.Homophase (in-phase) component of the signal after decay is (corresponding to each
The cosine signal that test signal is comprised) can process via different paths respectively from orthogonal (quadrature) component.Increase
Benefit counting circuit 550 then can be according to N number of in-phase signal S_FC1～S_FCN(correspond respectively to N number of cosine signal S_TC1～S_
TCN) and N number of orthogonal signalling S_FS1～S_FSN(correspond respectively to N number of sinusoidal signal S_TS1～S_TSN) obtain corresponding
Signal gain G1～GN, the most N number of in-phase signal S_FC1～S_FCNWith N number of orthogonal signalling S_FS1～S_FSNIt is the most i.e.
N number of feedback signal S_F1～S_FN。
About by N number of feedback signal S_F1～S_FNObtain corresponding signal gain G1～GNBe described as follows.Please connect
Come refering to Fig. 6 with Fig. 5.Fig. 6 is the flow chart of one of the method for signal calculated gain of the present invention embodiment, and these computational methods can be answered
For wireless transmitting system 500.Below to calculate test signal S_T1Signal gain be example explanation.First, can respectively by
Cosine signal S_TC1With by sinusoidal signal S_TS1It is represented by A1Cos (2 π ft) and A1Sin (2 π ft), therefore, can produce signal
Raw unit 540 produced test signal S_T1It is represented by: A1cos(2πft)+jA1sin(2πft)=A1ej2πft, wherein A1For
Test signal S_T1Amplitude, f for test signal S_T1Frequency, and t is the time.
At test signal S_T1After amplifying via signal transmission path 502, the test signal S_A after amplification1Can represent
For: A1B1ej(2πft+Φ1), wherein B1It is that radio-frequency power amplifier PA is supplied to test signal S_T1Gain, Φ1For test signal
S_T1Through phase contrast produced by radio-frequency power amplifier PA.The transmission that gain stage 508_1/508_2 is provided is ignored at this
Gain is to simplify calculating.
Similarly, do not affect determine preset gain when, negligible attenuator circuit 524 to amplify after test letter
Number S_A1The attenuation caused is to simplify calculating, therefore, and feedback signal S_F that gain calculating circuit 552 is received1Also can table
It is shown as A1B1ej(2πft+Φ1).Receiving feedback signal S_F1Afterwards, can be by feedback signal S_F1It is multiplied by e-j2πft, and the time is amassed
Point, to obtain the signal message A unrelated with the time1B1ejΦ1(as indicated in step 610).It follows that by signal message A1B1ejΦ1Remove
To test signal S_T1Amplitude A1, can obtain testing signal S_T1Signal gain G1(that is, | B1|2) (as step 620 institute
Show).
Can obtain testing signal S_T according to above-mentioned calculation process1～S_TNThe most corresponding signal gain G1～GN, and
Signal processing unit 550 can obtain corresponding relation between the two according to this.Referring to Fig. 7, it is the test signal shown in Fig. 5
Relation schematic diagram between index value (that is, subscript value) and corresponding signal gain.As shown in Figure 7, test signal S_T14
Corresponding signal gain G14Begin with downward trend, in other words, when the signal of input to radio-frequency power amplifier PA is for surveying
Trial signal S_T14～S_T16Time, radio-frequency power amplifier PA operates in inelastic region.
Due to multiple test signal S_T1～S_T16Corresponding different signal energy, therefore, can be according to obtained multiple
Signal gain G1～GNDetermine the suitable working region of radio-frequency power amplifier PA, and then determine the preset gain of gain stage.
Please come refering to Fig. 8 together with Fig. 7.Fig. 8 is that basis signal gain of the present invention is real to determine the method for the preset gain of gain stage one
Execute the flow chart of example.First, can be according to multiple signal gains G1～GNAmong a signal specific gain obtain one with reference to increase
Benefit, wherein this signal specific gain can be the test signal S_T with least energy1Corresponding signal gain G1, or multiple
Signal gain G1～GNAmong a peak signal gain (as shown in step 810).It follows that can by this reference gain respectively with
Multiple signal gains G1～GNAmong other residual signal gain make comparisons (as shown in step 820), to obtain closest to this ginseng
Examine the signal gain of gain and corresponding test signal.After obtaining above-mentioned test signal, can be according to test signal
Corresponding relation between energy and transmission gain determines the preset gain (as shown in step 830) of yield value.
As it has been described above, the gain being typically based on power amplifier reduces input power corresponding when 1 decibel to assess merit
The performance of rate amplifier.Therefore, above-mentioned reference gain may be set to signal specific gain and deducts 1 decibel, and can refer to Fig. 9 institute
The flow chart shown is to determine the preset gain of yield value.Fig. 9 is that the basis signal gain shown in Fig. 8 is to determine presetting of gain stage
The flow chart of one implementation example of the method for gain.In step 910, in order to reference gain is set as signal gain G1Deduct
1 decibel, can be by signal gain G1It is multiplied by a predetermined value (about 0.79).In step 920, calculate multiple signal gain respectively
G2～GNWith signal gain G1Between gain inequality (taking absolute value).Multiple gains in step 930, obtained by step 920
Among difference, find out test signal (such as, signal gain G that least gain is poor with corresponding14), can be according to this test signal
Index value (such as, 14) obtains corresponding transmission gain (in the embodiment shown in Fig. 4, i.e. "+4 decibels "), and according to this
Set the preset gain of gain stage.Further instruction is as follows.
Referring to Figure 10, it is the reality that the present invention determines the method for the preset gain of gain stage according to least gain difference
Execute the flow chart of example.The method can be applicable to the step 930 shown in Fig. 9, and can simply be summarized as follows.
Step 1000: start.
Step 1010: the initial value of least gain difference Min_diff is set as AD, by least gain difference index value Min_
The initial value of idx is set as 1, and the initial value of test signal index value m is set as 1.
Step 1020: test signal index value m is added 1.
Step 1030: judge test gain inequality Diff corresponding to signal index value mmWhether less than least gain difference Min_
diff？If so, step 1040 is performed；Otherwise, perform step 1050.
Step 1040: least gain difference Min_diff is set as gain inequality Diffm, and by least gain difference index value
Min_idx is set as testing signal index value m.
Step 1050: judge to test whether signal index value m is equal to N, to be confirmed whether multiple signal gain G2～GNThe most
Complete to check？If so, step 1070 is performed；Otherwise, return to step 1020.
Step 1060: judge to test whether signal index value m is equal to N, to be confirmed whether multiple gain inequality G2～GNThe completeest
Become to check？If so, step 1070 is performed；Otherwise, return to step 1020.
Step 1070: preset gain index value G_idx is set as least gain difference index value Min_idx.
Step 1080: terminate.
Initial value A set in step 1010DVisual actual demand/consideration sets it, and it also can be considered signal
Error preset value between gain and reference gain.Owing to those of ordinary skill in the art is reading speaking on somebody's behalf mutually of Fig. 2～Fig. 9
After bright, it should be appreciated that the preset gain index value G_idx that the flow process shown in Figure 10 is determined, can refer to shown in Fig. 4
Control bit set and determine the preset gain of gain stage, therefore further instruction just repeats no more at this.
From the foregoing, it will be observed that by the corresponding relation between test signal energy and transmission gain, it may be determined that presetting of gain stage
Gain.It should be noted that the corresponding relation between above-mentioned control bit set and transmission gain is intended for needing of explanation, not use
It is used as the restriction of the present invention, for example, it is 1 point that the gain inequality between adjacent two transmission gains shown in Fig. 4 does not limit
Shellfish, and certainly control bit set " 0000 " and do not limit to the gain inequality relation controlled corresponding to bit set " 1111 " and be incremented by
Relation, additionally, the number also visual actual demand/consideration controlling bit designs it.
Additionally, the transmission order of test signal is not necessarily and transmits in the way of increased energy, it is also possible to be with energy
The mode successively decreased is transmitted, even other transmission orders；It is the number of transmission gain that the number of test signal does not the most limit；?
When carrying out self-correction, as long as gain stage gain set in advance (that is, specific transmission gain) is enough big, it does not the most limit is
Big transmission gain.As long as in short, signal processing unit be able to know that between current received signal and transmission gain right
Should be related to, the transmission order of test signal can have multiple transmission order, and the number of test signal also needs not be equal to transmission
The number of gain.
Furthermore, when using string ripple signal to be used as testing signal, it is also possible to produce electricity only with single signal
Road (such as, it is only necessary to one of them of the signal generating circuit 504_1 shown in Fig. 5 and signal generating circuit 504_2) and it is right
Component among the signal transmission path answered, signal feedback path is to realize self correcting mechanism.Use other waveforms
It is also feasible that signal is used as above-mentioned test signal.
In sum, the method determining preset gain provided by the present invention can make wireless transmitting system carry out oneself school
Just, so that it is preset in suitable working region, not only meet the specification of error vector magnitude, and exportable enough output works
Rate, therefore transmitter spectral performance can be promoted, save the running cost of power amplifier the most in a large number.Furthermore, provided by the present invention
Self correcting mechanism, can remove use external circuit from and carry out testing radio transmission performance, reduce manpower and time cost.
The foregoing is only the preferred embodiments of the present invention, all impartial changes done according to scope of the present invention patent with
Modify, all should belong to the covering scope of the present invention.
Claims (18)
1. the method determining the preset gain of wireless transmitting system, described wireless transmitting system comprises a signal transmission path
And a signal feedback path, described signal feedback path is coupled to described signal transmission path, described signal transmission path bag
Containing a gain stage and a power amplification circuit, described gain stage has multiple transmission gain, and described method comprises:
The gain of described gain stage is set as a specific transmission gain among the plurality of transmission gain；
Under described specific transmission gain, sequentially transmit multiple test signal via described signal transmission path many to produce
Test signal after individual amplification, corresponds respectively to the plurality of biography in the energy of wherein said multiple test signals at least partially
Defeated gain；
Carry out the test signal after the plurality of amplification of received in sequence via described signal feedback path, and obtain corresponding according to this
Multiple signal gains；And
The preset gain of described gain stage is determined according to the plurality of signal gain.
Method the most according to claim 1, wherein, described specific transmission gain is among the plurality of transmission gain
Individual maximum transmitted gain.
Method the most according to claim 1, wherein, the number of the plurality of test signal is equal to the plurality of transmission gain
Number.
Method the most according to claim 3, wherein, by least energy to maximum energy in the energy of the plurality of test signal
The energy difference relation of amount is equal in the plurality of transmission gain by the gain inequality relation of minimum transfer gain to maximum transmitted gain.
Method the most according to claim 1, wherein, the transmission order between the plurality of test signal is corresponding to described many
Energy size order between individual test signal.
Method the most according to claim 1, wherein, determines presetting of described gain stage according to the plurality of signal gain
The step of gain comprises:
A reference gain is obtained according to a signal specific gain among the plurality of signal gain；
Described reference gain is made comparisons with remaining signal gain among the plurality of signal gain respectively；And
To be used as the preset gain of described gain stage closest to the transmission gain corresponding to the signal gain of described reference gain.
Method the most according to claim 6, wherein, described signal specific gain is the test signal institute with least energy
Corresponding signal gain, or a peak signal gain among the plurality of signal gain.
Method the most according to claim 7, wherein, according to the described peak signal gain among the plurality of signal gain
The step obtaining described reference gain comprises:
Described signal specific gain is multiplied by a predetermined value using as described reference gain.
Method the most according to claim 1, wherein, each the test signal among the plurality of test signal is one
String ripple signal.
10. a wireless transmitting system, comprises:
One signal transmission path, comprises:
One gain stage, has multiple transmission gain；And
One power amplification circuit；
One signal feedback path, is coupled to described signal transmission path；
One control unit, in order to be set as a specific transmission among the plurality of transmission gain by the gain of described gain stage
Gain；
One signal generation unit, is coupled to described signal transmission path, in order to produce multiple test signal, and in described specific biography
Under defeated gain, sequentially transmit the plurality of test signal with the survey after the multiple amplifications of generation via described signal transmission path
Trial signal, corresponds respectively to the plurality of transmission gain in the energy of wherein said multiple test signals at least partially；And
One signal processing unit, is coupled to described signal feedback path, described in order to receive via described signal feedback path
Test signal after multiple amplifications, and obtain corresponding multiple signal gains according to this, and according to the plurality of signal gain
Determine the preset gain of described gain stage.
11. wireless transmitting systems according to claim 10, wherein, described specific transmission gain is that the plurality of transmission increases
A maximum transmitted gain among benefit.
12. wireless transmitting systems according to claim 10, wherein, the number of the plurality of test signal is equal to described many
The number of individual transmission gain.
13. wireless transmitting systems according to claim 12, wherein, by minimum energy in the energy of the plurality of test signal
Measure to ceiling capacity energy difference relation equal in the plurality of transmission gain by minimum transfer gain to maximum transmitted gain
Gain inequality relation.
14. wireless transmitting systems according to claim 10, wherein, the transmission order between the plurality of test signal is right
Should energy size order between the plurality of test signal.
15. wireless transmitting systems according to claim 10, wherein, described signal processing unit is according to the plurality of signal
A signal specific gain among gain obtains a reference gain, by described reference gain respectively with the plurality of signal gain
Among remaining signal gain make comparisons, and with closest to described reference gain signal gain corresponding to transmission gain come
Preset gain as described gain stage.
16. wireless transmitting systems according to claim 15, wherein, described signal specific gain is to have least energy
Test signal gain corresponding to signal, or the peak signal gain among the plurality of signal gain.
17. wireless transmitting systems according to claim 15, wherein, described signal specific is increased by described signal processing unit
Benefit is multiplied by a predetermined value using as described reference gain.
18. wireless transmitting systems according to claim 10, wherein, each test among the plurality of test signal
Signal is a string ripple signal.
Priority Applications (1)
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