CN1700690B - Feedforward linear power amplifier counteracting and regulating method and apparatus - Google Patents
Feedforward linear power amplifier counteracting and regulating method and apparatus Download PDFInfo
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Abstract
This invention discloses one front feedback linear function offset adjusting method and device, wherein the method comprises the following steps: a, setting offset ring signals and relative scanning parameters two-dimensional scanning pattern; b, processing the offset scanning and estimating the best result signals aptitude and position; c, setting signal aptitude and best position and testing thereal offset results; d, when the result cannot meet the pre-set needs, then re-setting the ring signals and the pattern and going back to step b; e, when it meets the needs, then finishing the scanning and estimating the best position as the best adjust points.
Description
Technical field
The present invention relates to communication technique field, be specifically related to a kind of feed forward type linear power amplifier and offset method of adjustment and device.
Background technology
Fast development along with the radio mobile communication business, to the capacity of communication system require increasing, in order to improve message transmission rate and spectrum efficiency, modulation system trends towards adopting the linear modulation mode, as using QPSK (Quadrature Phase Shift Keying) modulation system among the 3G, therefore, the linearity to base station power amplification has proposed more and more higher requirement.And the linearity of power amplifier itself is limited, therefore needs to adopt the Linear Power Amplifier technology.Fig. 1 is the schematic diagram of feed forward type linear power amplifier:
Wherein LPU1 is that loop 1 is adjusted circuit, and LPU2 is that loop 2 is adjusted circuit, and MPA is main power amplifier, and EPA is the error power amplifier, and DL1 and DL2 are delay line.
The concrete working method of this power amplifier is as follows:
Loop 1 is a carrier cancellation loop, and input signal is divided into two branch roads up and down by LPU1 with signal, and last branch road send MPA to amplify, and following branch road is delayed time through DL1; Through the signal after the MPA amplification, owing to the impossible absolute linearity of MPA, therefore the distortion component of other frequencies can appear; Signal coupling part after MPA amplified and superpose through the signal after the DL1 time-delay, when the carrier signal amplitude of two paths of signals equate, when phase place is opposite, carrier cancellation is best.Signal residual distortion signal after the counteracting, distorted signal amplifies through EPA; Be used for carry out carrier cancellation except that fraction the signal after the MPA amplification, its main signal is delayed time through DL2, the signal of DL2 output with amplify through EPA after distorted signal superpose, when the distorted signal amplitude of two paths of signals equate, when phase place is opposite, distortion cancellation is best.
In carrier cancellation, use I respectively
c, Q
cSignal is controlled the wherein amplitude and the phase place of a branch road, detects the counteracting situation simultaneously, and detection signal is designated as y
cIn distortion cancellation, use I respectively
o, Q
oSignal is controlled the wherein amplitude and the phase place of a branch road, detects the counteracting situation simultaneously, and detection signal is designated as y
oy
c, y
oValue more little, illustrate that neutralization effect is good more.
The relation of I, Q and y is (carrier cancellation is identical with the distortion cancellation principle, for convenience, below is referred to as counteracting) as shown in Figure 2: promptly when I, Q got certain point, y had minimum value.The position of this point also can be subjected to the influence of other factors, and as input power, operating frequency etc., the purpose of therefore offsetting adjustment is exactly constantly to adjust to make counteracting remain on smallest point.
Existing adjustment mode at first fixedly I, Q one of them.As fixing Q, at first adjust I, after the minimum value that finds y value concave point place, I is set again is this value, scanning Q finds the minimum value at y value concave point place equally;
Repeat said process up to finding the y value that meets the demands.
There is following shortcoming in this counteracting adjustment mode:
1, fixing another parameter of adjustment under the parameter situation, do not have consideration influence each other, might find false optimum.A typical situation is as shown in Figure 3: I is fixed on shown position, and scanning Q finds minimum point A point, and then fixing Q, and scans I, minimum point remain the A point, but in fact smallest point should be at the B point.
2, situation as shown in Figure 4 when Q being set being Q1, can not find concave point, causes and can't adjust.
3, because there is certain deviation in the detection of y value, when the variation of y value is little between adjacent 2, may pseudo-concave point appear owing to detect error, fail thereby cause adjusting.
4, the initial value when scanning is provided with when unreasonable, needs adjustment repeatedly repeatedly just can find optimum.
Various as mentioned above situations cause finding optimum or take a long time and find optimum, all can cause the linear index variation of Linear Power Amplifier, thereby influence the index such as covering, interference, error code of wireless system.
Summary of the invention
The purpose of this invention is to provide a kind of feed forward type linear power amplifier and offset method of adjustment and device,, improve simultaneously to detect and adjust efficient with the pseudo-concave point of avoiding occurring in the prior art.
The objective of the invention is to be achieved through the following technical solutions:
A kind of feed forward type linear power amplifier is offset method of adjustment, it is characterized in that, comprising:
A, be provided with and offset loop signals amplitude and phase place initial value; Sweep radius is set; Counteracting loop signals amplitude and phase place initial value with described setting on the two dimensional surface of amplitude and phase place are central point, are that radius makes up the two dimensional surface scan pattern with the sweep radius of described setting;
B, offset scanning, infer the signal amplitude and the phase bit position of best offset result correspondence according to described two dimensional surface scan pattern;
C, described signal amplitude and phase place are set, and detect actual offset result to the signal amplitude of the best offset result correspondence of described supposition and bit position mutually;
D, when the offset result of described reality does not satisfy predetermined the requirement, reset the two dimensional surface scan pattern of the sweep parameter of offsetting loop signals amplitude and phase place, and return step B and offset scanning again;
E, when the offset result of described reality satisfies predetermined the requirement, finish scanning process, and with the optimum position of described supposition adjustment point as the best.
Described counteracting loop is specially: carrier cancellation loop or distortion cancellation loop.
Described sweep radius is: connect in the polygonal each point that some points constitute around the described central point near in the polygonal each point of the absolute value of the difference of the signal amplitude value of the signal amplitude value of the each point of central point and central point, described formation near the absolute value of the difference of the signal phase value of the signal phase value of the each point of central point and central point.
Described step B specifically comprises step:
B1, offset scanning, obtain actual offset result according to described two dimensional surface scan pattern;
B2, in amplitude, phase place and offset result three-dimensional system of coordinate, fit the surface model of offset result with amplitude and phase change;
B3, obtain coordinate and the type that offset result fits the point of safes of curved surface according to described surface model;
If the described point of safes that fits curved surface that obtains of B4 is maximum point or saddle point, then do not change the position of central point, enlarge described sweep radius, reset the two dimensional surface scan pattern of described counteracting loop signals amplitude and phasescan parameter, return step B1 then and offset scanning again;
If the described point of safes that fits curved surface that obtains of B5 is a smallest point, then with signal amplitude and the phase bit position of described point of safes as best offset result correspondence.
The described surface model that fits adopts secondary model, and utilizes least square method to fit.
Described predetermined requirement is: the offset result of described reality is less than or equal to a predetermined value.
Described step D specifically comprises:
The signal amplitude and the phase bit position of the best offset result correspondence of D1, described supposition are set to new central point;
D2, determine new sweep radius according to the offset result of described reality.
When in described step D2, determining new sweep radius, when the offset result of described reality adopts littler sweep radius during more near predetermined value.
In whole counteracting scanning process, offset the shape invarianceization of the two dimensional surface scan pattern of loop signals amplitude and phasescan parameter, the position of a Mobility Center point and change sweep radius.
By above technical scheme provided by the invention as can be seen, the present invention takes to change simultaneously the scan mode of the value of offsetting loop signals (carrier wave and distorted signal) amplitude and phase place, realizes the quick searching of optimum, has avoided occurring false optimum.In scanning process, adjust the sweep radius of offsetting loop signals amplitude and phase place according to the judgement of the point of safes that scanning is for the first time determined, find the smallest point of offsetting detected value fast; When offsetting when not meeting the demands, point of safes is set to new central point and scans once more again, makes and can find optimum fast by the scanning fast convergence rate, has improved adjustment efficient.And, by repeatedly sampling, reduced the influence that detects error to sweep center point.
Description of drawings
Fig. 1 is the schematic diagram of feed forward type linear power amplifier;
Fig. 2 is amplitude, the phase place of signal in the feed forward type linear power amplifier shown in Figure 1 and the schematic diagram that concerns of offsetting detection signal;
Fig. 3 utilizes prior art to offset the situation that occurs false optimum when adjusting;
Fig. 4 utilizes prior art to offset the situation that can not find optimum when adjusting;
Fig. 5 is the flow chart that feed forward type linear power amplifier of the present invention is offset method of adjustment;
Fig. 6 is with the amplitude of signal, the situation that the phasescan pattern transforms to normalized coordinate system in the inventive method;
Fig. 7 is the structural representation of apparatus of the present invention.
Embodiment
Core of the present invention is to take to change simultaneously the scan mode of the value of offsetting loop signals (comprising carrier signal and distorted signal) amplitude and phase place, finds power amplifier to offset the optimum of adjusting fast, avoids occurring the situation of false optimum simultaneously.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.
With reference to Fig. 5, Fig. 5 shows the detailed process that feed forward type linear power amplifier of the present invention is offset method of adjustment, may further comprise the steps:
Offset adjustment or distortion cancellation adjustment process at step 501 beginning incoming carrier, the counteracting method of adjustment and the process of these two loops are identical, therefore for convenience, will be referred to as counteracting below.
After entering the counteracting adjustment process, at first enter step 502, judge whether this time adjustment is to adjust for the first time, if, then enter step 503, the two dimensional surface scan pattern of offsetting loop signals amplitude and phasescan parameter is set.Detailed process is: at first be provided with and offset loop signals amplitude (I value) and phase place (Q value) initial value, and initial sweep radius, described sweep radius is meant that signal amplitude and the phase place initial value with setting is the center on the two dimensional surface of amplitude and phase place, around it, choose some points, connect in the each point of the polygon (this polygon is the center with amplitude and phase place initial value and is centrosymmetric) that adjacent point constitutes absolute value near the difference of the signal amplitude value of the signal amplitude value of the each point of central point and central point, perhaps constitute in this polygonal each point absolute value near the difference of the signal phase value of the signal phase value of the each point of central point and central point, these two values can be set to equate, also can be set to unequal.Then, on the two dimensional surface of amplitude and phase place, be central point with the counteracting loop signals amplitude and the phase place initial value that are provided with, be that radius makes up the two-dimensional plane scan pattern with the sweep radius of described setting.
Then, enter step 504, offset scanning, obtain actual offset result according to the counteracting loop signals amplitude of Set For Current and the two dimensional surface scan pattern of phasescan parameter.
Then, enter step 505, in amplitude, phase place and offset result three-dimensional system of coordinate, fit offset result obtains the point of safes that fits curved surface with the surface model of amplitude and phase change coordinate and type according to offset result.The coordinate that fits the point of safes of curved surface promptly refers to this point is corresponding in the two dimensional surface of described amplitude and phase place the signal amplitude and the value of phase place; The point of safes that fits curved surface has three types: maximum point, saddle point and smallest point.
The present technique field personnel know, curved surface fits and can be divided into interpolation and approach dual mode.Use the interpolation method fitting surface by all data points, be suitable for measuring equipment precision height, the occasion that the data point coordinate is more accurate; The curved surface of the method institute match that use approaches is applicable to that not necessarily by all data points measurement data is more, and measurement data contains the noise condition with higher.Therefore, can select the different methods that fits for use according to actual needs.For example, fit surface model and adopt secondary model, utilize least square method to fit.Calculate the position of point of safes by the fit equation of selecting for use, i.e. unique point of determining by the signal amplitude and the phase place of two dimension.
Then, enter step 506, judge whether the above-mentioned point of safes that fits curved surface that obtains is maximum point or saddle point.
If maximum point or saddle point, illustrate that then current sweep radius is too little, smallest point has dropped on outside the scanning area, therefore, enter step 507, enlarge sweep radius and reset the two dimensional surface scan pattern of offsetting loop signals amplitude and phasescan parameter, at this moment, need not adjust the position of original central point, only need to enlarge sweep radius and get final product.Then, return step 504, offset scanning again, till confirming that the point of safes that obtains is smallest point.
If the point of safes that fits curved surface that is obtained by above-mentioned counteracting scanning is a smallest point, infer that then this point is the signal amplitude of best offset result correspondence and phase bit position.At this moment, directly enter step 508, signalization amplitude and phase place are to the signal amplitude of the best offset result correspondence of above-mentioned supposition and bit position mutually.Then, enter step 509, detect the actual offset result of this point.
Enter step 510, judge whether the actual offset result of above-mentioned this point that records satisfies predetermined requirement, just offset result is preestablished a predetermined value, judge whether the actual offset result of above-mentioned this point that records is less than or equal to this predetermined value.
If the actual offset result of this point that records is less than or equal to this predetermined value, think that then this is offset adjustment and has reached pre-provisioning request, at this moment, enter step 511, signal amplitude when record is offset testing result and reached pre-provisioning request and the value of phase place, and with the optimum position of this supposition adjustment point as the best.Then, to step 512, the counteracting adjustment of loop is promptly finished, finished scanning process, whole adjustment process also is through with simultaneously.
If the actual offset result of this point that records, then shows this counteracting adjustment greater than predetermined value and does not also reach pre-provisioning request, at this moment, enter step 513, reset the two dimensional surface scan pattern of offsetting loop signals amplitude and phasescan parameter.Concrete set-up mode is: the signal amplitude and the phase bit position of the best offset result correspondence of above-mentioned supposition are set to new central point; Determine new sweep radius according to the offset result of reality.Should follow such principle when determining new sweep radius: if the actual approaching more described predetermined value of offset result then needs to adopt littler sweep radius.
Then, return step 504, offset scanning again according to the counteracting loop signals amplitude of Set For Current and the two dimensional surface scan pattern of phasescan parameter.
Above-mentioned steps 504 to step 505 is the signal amplitude (I) once complete in the inventive method and the scanning process on phase place (Q) plane, in whole counteracting scanning process, offset the shape invarianceization of the two dimensional surface scan pattern of loop signals amplitude and phasescan parameter, the position of a Mobility Center point and change sweep radius.
To elaborate to this scanning process below:
1, selects I, Q scanning pattern, the Central Composite response surface experimental design of selecting I, Q two-factor is as scan pattern, span according to I, Q is selected suitable initial level, it is the initial value of I, Q, the initial value of note I is i, the initial value of Q is q, and the sweep radius of I is Ri, and the sweep radius of Q is Rq.Be convenient and calculate, at first with I, Q by following formula normalization, the scan pattern of I, Q is transformed to a, b plane:
The pattern of I, Q scanning transforms to behind a, b plane (the normalized coordinate system) as shown in Figure 6:
Normalized benefit is for different I, Q central point and sweep radius, remains unchanged through the position on a, b plane after the normalized, is convenient to calculate.
Because the measure error of the value of central point has considerable influence to offset result with the model of amplitude and phase change, therefore gather 5 secondary data ((0, the 0) point among Fig. 6), to reduce error at central point.So the value of 13 groups of IQ is set altogether, measure the Y detected value respectively, obtain following table 1:
Table 1:
| a | b | y |
| 1.00000 | 1.00000 | y1 |
| 0.00000 | 0.00000 | y2 |
| 0.00000 | 1.41421 | y3 |
| 0.00000 | -1.41421 | y4 |
| 1.00000 | -1.00000 | y5 |
| 0.00000 | 0.00000 | y6 |
| -1.41421 | 0.00000 | y7 |
| 0.00000 | 0.00000 | y8 |
| 0.00000 | 0.00000 | y9 |
| 0.00000 | 0.00000 | y10 |
| 1.41421 | 0.00000 | y11 |
| a | b | y |
| -1.00000 | -1.00000 | y12 |
| -1.00000 | 1.00000 | y13 |
In above-mentioned data acquisition, can take the several number strong point to carry out detected value (Y) test according to the required precision of adjusting and the difference of model, if it is higher to adjust required precision, but then multiselect is got some test points.It should be noted that because all there is certain error in all measurements, and the measure error of central point is especially outstanding to the influence of model, therefore, must gather some measured values at central point more.
2,, fit surface equation according to testing result
Fit equation adopts secondary model: y=c1+c2*a+c3*b+c4*a*a+c5*b*b+c6*a*b
The coefficient c0 of fit equation～c6 adopts least square method to fit:
Use matrix notation:
C=(X is then arranged
TX)
-1X
TY (X
TX)
-1X
TBe fixed value, be calculated as follows:
Said fixing is on duty with Y, then have:
c1＝0.2*(y9+y10+y11+y12+y13)
c2＝0.125*(y2+y4-y1-y3)+0.1768*(y6-y5)
c3＝0.125*(y3+y4-y1-y2)+0.1768*(y8-y7)
c4＝0.0625*(y1+y2+y3+y4-y7-y8)+0.1875*(y5+y6)-0.1*(y9+y10+y11+y12+y13)
c5＝0.0625*(y1+y2+y3+y4-y5-y6)+0.1875*(y7+y8)-0.1*(y9+y10+y11+y12+y13)
c6＝0.25*(y1-y2-y3+y4)
3, calculate the point of safes that fits curved surface
Point of safes
Value can be expressed as:
And then according to
Transform to I, Q plane, obtain I, the Q value of point of safes.
4, judge the point of safes type
Determination methods is as follows:
Order
Being write as the linear equation in two unknowns form is
That finds the solution that this equation obtains equation separates t1, t2
When t1, t2 are the smallest point of expectation greater than zero the time.
When t1, t2 are maximum points less than zero the time, when t1, t2 are saddle points during opposite in sign.
Below with reference to the structural representation of feed forward type linear power amplifier counteracting adjusting device of the present invention shown in Figure 7, describe the course of work of apparatus of the present invention in detail:
Carrying out amplitude and phase place that process that Linear Power Amplifier offset to adjust is actually the signal of carrier wave adjustment loop and distortion adjustment loop scans, on the plane of scanning motion, choose the detection sampling point then, test the detected value of these sampling points, then according to the selected mode that fits, acquisition fits the point of safes that minimum value is detected on the plane, stops to adjust when meeting pre-provisioning request with the detected value of this point of safes correspondence.In conjunction with Fig. 7, this adjustment process is specific as follows:
At first, when adjusting for the first time, set the initial parameter of offsetting scanning by the parameter setting apparatus in the parameter management device 71 711, initial parameter comprises: sweep center point and sweep radius.The present invention adopts and changes the amplitude of adjustment loop signal and the scan mode of phase place simultaneously, therefore, and the Central Composite response surface pattern of these 2 factors of selecting range and phase place.Select several to offset test point by the sampling apparatus in the scanning means 72 721 then.Because the measure error of sweep center point is bigger to the influence that fits model, so, need repeatedly sample at sweep center point in order to reduce measure error.According to the parameter value (amplitude and phase value) of these sampling points and corresponding detected value by fit device 722 scanning patterns and actual detected to offset result fit curved surface, obtain this point of safes position that fits curved surface and corresponding detected value.Judge by point of safes kind judging device 723 whether this point of safes that fits curved surface that fits device 722 acquisitions is smallest point, if not smallest point, illustrates that then current sweep radius is too little, and smallest point drops on outside the scanning area then.At this moment, then parameter adjustment controls in the notifying parameters management devices 71 712 enlarge sweep radius, scan again, up to obtaining detected value point of safes hour.Judge by judgment means 73 whether the detected value of this point of safes correspondence is less than or equal to a preset detection value then, if then explanation adjustment has reached pre-provisioning request, can finish adjustment process.If not, then explanation adjustment does not also reach pre-provisioning request, at this moment needs notifying parameters adjusting device 712 to readjust sweep parameter.Concrete adjustment mode is: the point of safes of above-mentioned acquisition as new central point, is determined new sweep radius according to offsetting detected value; The parameter notifying parameters adjusting device 712 that these are new upgrades sweep parameter, scans again.
By top description as can be seen, the adjustment of offsetting for loop may just can make detected value reach predetermined requirement through repeatedly adjusting repeatedly.The present invention is not set to new central point, determines new sweep radius according to the variation tendency of the actual counteracting detected value that records by meeting the requirements of point of safes, makes that fitting the plane is restrained fast, can find the optimum of detected value soon.
In addition, by repeatedly sampling, further reduced and detected error adjusting the influence of effect to sweep center point.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (9)
1. a feed forward type linear power amplifier is offset method of adjustment, it is characterized in that, may further comprise the steps:
A, be provided with and offset loop signals amplitude and phase place initial value; Sweep radius is set; Counteracting loop signals amplitude and phase place initial value with described setting on the two dimensional surface of amplitude and phase place are central point, are that radius makes up the two dimensional surface scan pattern with the sweep radius of described setting;
B, offset scanning, infer the signal amplitude and the phase bit position of best offset result correspondence according to described two dimensional surface scan pattern;
C, described signal amplitude and phase place are set, and detect actual offset result to the signal amplitude of the best offset result correspondence of described supposition and bit position mutually;
D, when the offset result of described reality does not satisfy predetermined the requirement, reset the two dimensional surface scan pattern of the sweep parameter of offsetting loop signals amplitude and phase place, and return step B and offset scanning again;
E, when the offset result of described reality satisfies predetermined the requirement, finish scanning process, and with the optimum position of described supposition adjustment point as the best.
2. feed forward type linear power amplifier as claimed in claim 1 is offset method of adjustment, it is characterized in that described counteracting loop is specially: carrier cancellation loop or distortion cancellation loop.
3. feed forward type linear power amplifier as claimed in claim 2 is offset method of adjustment, it is characterized in that described sweep radius is: connect in the polygonal each point that some points constitute around the described central point near in the polygonal each point of the absolute value of the difference of the signal amplitude value of the signal amplitude value of the each point of central point and central point or described formation near the absolute value of the difference of the signal phase value of the signal phase value of the each point of central point and central point.
4. feed forward type linear power amplifier as claimed in claim 2 is offset method of adjustment, it is characterized in that described step B specifically comprises step:
B1, offset scanning, obtain actual offset result according to described two dimensional surface scan pattern;
B2, in amplitude, phase place and offset result three-dimensional system of coordinate, fit the surface model of offset result with amplitude and phase change;
B3, obtain coordinate and the type that offset result fits the point of safes of curved surface according to described surface model;
If the described point of safes that fits curved surface that obtains of B4 is maximum point or saddle point, then do not change the position of central point, enlarge described sweep radius, reset the two dimensional surface scan pattern of described counteracting loop signals amplitude and phasescan parameter, return step B1 then and offset scanning again;
If the described point of safes that fits curved surface that obtains of B5 is a smallest point, then with signal amplitude and the phase bit position of described point of safes as best offset result correspondence.
5. feed forward type linear power amplifier as claimed in claim 4 is offset method of adjustment, it is characterized in that, the described surface model that fits adopts secondary model, and utilizes least square method to fit.
6. feed forward type linear power amplifier as claimed in claim 1 is offset method of adjustment, it is characterized in that described predetermined requirement is: the offset result of described reality is less than or equal to a predetermined value.
7. feed forward type linear power amplifier as claimed in claim 1 is offset method of adjustment, it is characterized in that described step D specifically comprises:
The signal amplitude and the phase bit position of the best offset result correspondence of D1, described supposition are set to new central point;
D2, determine new sweep radius according to the offset result of described reality.
8. feed forward type linear power amplifier as claimed in claim 7 is offset method of adjustment, it is characterized in that, when determining new sweep radius in described step D2, when the offset result of described reality adopts littler sweep radius during more near predetermined value.
9. feed forward type linear power amplifier as claimed in claim 1 is offset method of adjustment, it is characterized in that, in whole counteracting scanning process, offset the shape invarianceization of the two dimensional surface scan pattern of loop signals amplitude and phasescan parameter, the position of a Mobility Center point and change sweep radius.
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| CN1309465A (en) * | 1998-06-21 | 2001-08-22 | 完美通讯有限公司 | Method and apparatus for adaptive adjusting feedforward linearized amplifier |
| CN1430425A (en) * | 2001-12-31 | 2003-07-16 | 深圳市中兴通讯股份有限公司上海第二研究所 | Adaptive tracking cancellation control method of feed forward type linear power amplifier and equipment |
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2004
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|---|---|---|---|---|
| US4389618A (en) * | 1981-04-15 | 1983-06-21 | The United States Of America As Represented By The Secretary Of The Navy | Adaptive feed-forward system |
| CN1083986A (en) * | 1992-03-20 | 1994-03-16 | 莫托罗拉公司 | The independent feed forward amplifier network of high dynamic range modulation |
| US6081156A (en) * | 1997-12-26 | 2000-06-27 | Samsung Electronics Co., Ltd. | Method and apparatus for amplifying feedforward linear power using pilot tone hopping |
| CN1309465A (en) * | 1998-06-21 | 2001-08-22 | 完美通讯有限公司 | Method and apparatus for adaptive adjusting feedforward linearized amplifier |
| CN1430425A (en) * | 2001-12-31 | 2003-07-16 | 深圳市中兴通讯股份有限公司上海第二研究所 | Adaptive tracking cancellation control method of feed forward type linear power amplifier and equipment |
| CN1507188A (en) * | 2002-12-10 | 2004-06-23 | 深圳市中兴通讯股份有限公司 | Adaptive carrier inhibiting method for multiple-carrier linear power amplifier |
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