CN116595927B - Voltage mapping establishment method for dynamic power supply power amplification system - Google Patents
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Abstract
The invention discloses a voltage mapping establishment method for a dynamic power supply power amplification system, which is used for iteratively optimizing the highest power supply voltage and a mapping function relation, determining the adjustment direction of the highest power supply voltage by comparing the position relation between the current mapping curve and a set reference mapping curve, ensuring the consistency and stability of an optimal judgment criterion, and obtaining the optimal power supply voltage under the conditions of large bandwidth and complex environment. On the basis, the invention obtains the amplitude gain through the input and output envelopes, adjusts the mapping function relation through the deviation between the amplitude gain and the ideal constant gain, respectively sets two levels of error thresholds for the highest power supply voltage iteration and the mapping function iteration, reduces the steps required by the two iterations, reduces the time complexity of the algorithm, has better engineering feasibility, can effectively provide the power amplification efficiency and the linearity, and further improves the efficiency of the communication and communication countermeasure system.
Description
Technical Field
The invention relates to the technical field of radio frequency high-power transmission, in particular to a voltage mapping establishment method for a dynamic power supply power amplification system.
Background
The radio frequency power amplifier (hereinafter referred to as radio frequency power amplifier) is an important component of the wireless communication system, and is used for increasing signal power, counteracting space transmission path loss and ensuring that the received signal-to-noise ratio meets the demodulation requirement. In the communication and communication countermeasure system, the efficiency and linearity of the radio frequency power amplifier are critical, the efficiency of the radio frequency power amplifier determines the system power consumption, and then determines the heat dissipation requirement, which is a main constraint factor of the volume and weight of the transmitting system, and meanwhile, the system power consumption determines the running cost; the linearity of the amplitude modulation system determines the quality of the transmitted signal, affecting the accuracy (or bit error rate) of the information transfer.
The efficiency and the linearity indexes are contradictory, the efficiency of the radio frequency power amplifier is always optimal when the power device enters a saturation region, namely, the increment of output power is far smaller than that of an input signal, the amplitude variation of the output signal is seriously deviated from the input signal, the power amplifier presents obvious nonlinear distortion, the power device is far away or just presents a weak compression state when the maximum output amplitude of the radio frequency power amplifier needs to be ensured in order to ensure the linearity of the radio frequency power amplifier, and the efficiency of the radio frequency power amplifier is far lower than the saturation power efficiency for a signal with average power far smaller than peak power (namely, high peak-to-average power ratio-PAPR).
The development of the modern communication technology further aggravates the contradiction between the efficiency and the linearity of the radio frequency power amplifier, on one hand, the peak-to-average ratio of the signal often reaches more than 10dB, and the requirement on the linearity of the signal is also higher and higher, so that a large-amplitude power back-off is required, and the efficiency is seriously reduced; on the other hand, the miniaturization, portability and mobility requirements of the communication equipment are stronger and stronger, the deployment amount is larger and larger, the problems in the aspects of volume, weight, operation cost and environmental protection caused by low efficiency are more and more prominent, and the high-efficiency power amplification technology is a key for solving the contradiction.
At present, the high-efficiency power technology commonly used in the communication field comprises a Doherty technology and an Envelope Tracking (ET) technology, wherein the system of the Doherty technology has relatively simple composition and large power capacity, but the available bandwidth is limited (the typical relative bandwidth is about 10%), and the high-efficiency power technology is mainly used for a base station transmitting end with the power level of hundreds of watts; the envelope tracking technology is mostly used for mobile terminals with transmitting power below the watt level, the performance of the mobile terminals is not limited by carrier frequency in principle, the workable bandwidth is large, but a complex envelope modulation power supply is needed, when the envelope bandwidth reaches more than MHz, the envelope modulation power supply needs a linear amplifier to provide high-frequency response, the efficiency of the linear amplifier is low, and the overall efficiency of a power amplification system is affected.
Envelope tracking is one of dynamic power supply technologies, and improves the efficiency of a radio frequency power amplifier by providing a dynamically-changing power supply voltage for the radio frequency power amplifier, and the existing ET (or dynamic power supply) technology is mainly applied to UHF, L and S frequency bands, and is less applied in the field of short wave wireless transmission, and the main reason is that: typical dynamic power supply technology is generally directed to relatively determined loads and environmental conditions, and relatively flatThe design and shaping of the power amplifier has the determined highest power supply voltage (recorded as) The highest supply voltage determines the compression state of the power amplifier and thus the final efficiency of the system.
The working frequency range of the short wave transmitting system is wide, the working frequency range covers about 4 octaves of 1.6 MHz-30 MHz, the characteristics of a power amplification circuit and a high-power load system (such as an antenna) are violently changed along with the frequency (for example, the typical standing wave ratio fluctuation of the antenna reaches more than 2.5), the system characteristics are also changed under the influence of the surrounding electromagnetic environment and weather conditions, and the system characteristics are different for different frequencies, load conditions and environmental conditionsThe optimum system efficiency is ensured and therefore the highest supply voltage needs to be determined adaptively during the voltage mapping process.
Patent publication No. CN115333485A discloses a dynamic power supply system for a radio frequency power amplifier and a control method thereof, which first searches for a gain compression value under a constant voltageThen iterate the voltage mapping to realizeIn engineering applications, the horizontal axis of the curve is input power, the vertical axis is power amplification gain, wherein the highest gain point is at 11 (25.6 dB), and if the 2dB compression point is taken as an example, the 2dB compression point of the gain curve is at 13 (23.6 dB); whereas a typical class AB power amplifier generally has a highest gain at 12 (24.7 dB) and a 2dB compression point at 14 (22.7 dB), the offset of the highest gain point results in a 2dB compression point deviationThe search algorithm can only target at 13 gains, and the obtained workThe discharge efficiency is lower than the case of targeting the gain at 14, and the optimum efficiency cannot be obtained; fig. 2 shows a gain characteristic including a memory effect, the gain at the present time being related not only to the present input power but also to the input power at the previous time, so that the gain curve exhibits a discrete band-like distribution, which characteristic also causes ambiguity in the judgment of gain compression,the search results fail to obtain optimal efficiency; thus, the optimumIs the criterion of (2)The search algorithm needs to solve the problem.
In addition, the result is obtained by searching under constant voltageNot the best corresponding to the true mapping curveTherefore, the power amplifier efficiency is not optimal, ifBy combining with the mapping curve, iteration of one dimension is increased, so that the time complexity of an algorithm is greatly increased, the engineering practicability is influenced, and the method is reducedThe complexity of the algorithm combined with the mapping curve is a key for improving the performance and the engineering realizability of the dynamic power amplifier system.
Based on the above drawbacks and deficiencies, there is a need for improvements in the art to design a voltage mapping establishment method for a dynamic power amplifier system.
Disclosure of Invention
The invention mainly solves the technical problem of providing a voltage mapping establishment method for a dynamic power supply power amplification systemThe method can optimize and obtain the highest power supply voltage under the condition of large working bandwidth and complex environmentThe optimization result is not influenced by the gain characteristic of the power amplifier; in addition, in the case of the optical fiber,and the method is combined with the mapping curve for optimization, so that the algorithm complexity is low, and the engineering feasibility is good.
In order to solve the technical problems, the invention adopts a technical scheme that: the voltage mapping establishment method for the dynamic power supply power amplification system comprises the following steps:
s1) setting the highest supply voltageDefining a reference mapping curveWherein the argument isFor the input of the envelope of the radio frequency signal,corresponding to the power supply voltage of the power amplifier,is thatMonotonically increasing function of (c) and satisfy，Peak value of the input radio frequency envelope;
s2) enabling the dynamic power supply to be in voltage mapping relationProviding voltage to the radio frequency power amplifier and adjusting the gain of the amplifying linkThe output power of the radio frequency power amplifier reaches a set value;
s3) reading envelope of power amplifier output signalAnd (3) withCalculating gain after delay alignmentFurther obtain peak envelopeGain atThe method comprises the steps of carrying out a first treatment on the surface of the Calculation ofAnd (3) withError between；
S4) judging errors, if the errors areIf the voltage is larger than the threshold value, correcting the voltage mapping curveExecuting step S2); otherwise, executing the step S5);
s5) calculating a current voltage mapping curveRelative position relation with reference mapping curve, judging:
if the two are coincident, the current mapping curve is kept, iteration is exited, and the mapping process is completed;
if it isIs positioned atAbove (2), then decreaseIs that，Is a positive real number;
if it isIs positioned atIs increased belowIs that；
Wherein the method comprises the steps ofTo be new after change，Is as the origin；
S6) correctionEnabling the dynamic power supply system to supply power to the radio frequency power amplifier according to the corrected mapping relation;
s7) adjusting the radio frequency link gainThe output power of the radio frequency power amplifier reaches a set value; returning to step S3).
Further, the step S4) is:
s4) judging if the errorGreater than threshold->Then modify the voltage map +.>Executing step S2); otherwise, executing the step S5);
the method is also characterized in that the step S5) is as follows:
s5) calculating a current voltage mapping curveRelative position relation with reference mapping curve, judging:
if it isAnd (3) withOverlap, and error Err is less than or equal to threshold valueMaintaining the current mapping curve, exiting iteration, and finishing the mapping process; if the two are coincident but the error Err is greater than the threshold valueThen the voltage mapping curve is correctedExecuting step S2);
the threshold。
Further, the reference map in the step S1)The definition is as follows:whereinThe peak value of the corresponding envelope is,for the inflection point envelope value,。
further, in the step S5), the current voltage mapping curve is calculated by the following methodRelative positional relationship with reference map curve:
defining tolerancesIs real, if，For the inflection point envelope value,thenIs positioned atIs above of (2); if it isThenIs positioned atIs arranged below the lower part of the upper part; otherwise, the two are coincident.
Further, in the step S5), the current voltage mapping curve is calculated by the following methodRelative positional relationship with reference map curve: calculation of；
Defining tolerancesIs a real number; if->Maintaining the current mapping curve, exiting iteration, and finishing the mapping process; otherwise revise->Wherein->Is a real number.
Further, in the step S5), the current voltage mapping curve is calculated by the following methodRelative positional relationship with reference map curve: calculation of；
Defining tolerancesFor real numbers, defining an error threshold Th2; if->And->Maintaining the current mapping curve, exiting iteration, and finishing the mapping process; if->But->Then the voltage mapping curve is correctedExecuting step S7); if->Revision->WhereinIs a real number.
Further, in the step S5), the following formula is calculated：，Is the inflection point envelope value.
Further, the saidAnd (3) withError betweenIs mean square error, i.eWherein N isThe natural number, N, is also the number of points sampled.
Further, the positive voltage map is modified in the step S4)The method of (1) is as follows:
for the firstInput envelope sampling points，Calculation ofObtaining N pairs of dataThe method comprises the steps of carrying out a first treatment on the surface of the Fitting the N data by adopting an M-order polynomial, wherein M is a natural number and is taken as 2-7, so as to obtain a mapping relation，Is a polynomial coefficient; by usingReplacing original mappingsI.e.。
Further, the step S7) is: judging whether the total iteration step number exceeds the standard, if so, exiting iteration and giving a prompt; otherwise: the iteration step number is added with 1, and the gain of the radio frequency link is adjustedThe output power of the radio frequency power amplifier reaches the set valueFixed value, returning to step S3).
Further, the step S7) is: judgingWhether or not it is true, beta is a real number greater than 1, if so, andif the limit value is reached, the iteration is exited, and a prompt is given; otherwise, adjusting the radio frequency link gainAnd (3) enabling the output power of the radio frequency power amplifier to reach a set value, and returning to the step (S3).
Further, the step S1) sets the highest power supply voltageEnvelope of input RF signal isDefining a reference mapping curve，
Wherein K is a natural number, taken as 1 to 3,as a result of the fact that the coefficients are,，the peak value of the corresponding envelope is,for the inflection point envelope value,。
compared with the prior art, the invention has the beneficial effects that:
optimization targeting reference mapping curvesSearching for the highest supply voltageDeviation and uncertainty caused by gain compression criteria are effectively avoided, and consistency of optimization results under the conditions of large working bandwidth and complex environment is ensured; by combiningSynchronous search optimization combined with mapping curve to ensureThe mapping curve is better adapted, so that better efficiency is obtained, meanwhile, the time complexity is lower, the engineering feasibility is better, the power amplification efficiency and the linearity can be effectively provided, and the efficiency of the communication and the communication countermeasure system is further improved.
Drawings
FIG. 1 is a graph illustrating an example of a compression point shift caused by a highest gain point shift;
FIG. 2 is a graph showing gain curves for memory effects;
FIG. 3 is a graph of gain of a radio frequency power amplifier as a function of input power and supply voltage;
FIG. 4 is a flow chart of a first embodiment of the present invention;
FIG. 5 is a graph of one of the reference map curves (broken line) according to an embodiment of the present invention;
FIG. 6 is a second (conic) of a reference map according to an embodiment of the invention;
fig. 7 is an example of a curve position relationship judging method according to the first embodiment of the present invention;
fig. 8 is an example of a second curve position relationship judging method according to the first embodiment of the present invention;
fig. 9 is an example of a third curve position relationship judging method according to the first embodiment of the present invention;
FIG. 10 is an example of the variation law of the gain of a typical class AB power amplifier with input power and supply voltage;
FIG. 11 shows gain characteristics corresponding to three highest supply voltages;
FIG. 12 shows the use of a higher levelA time gain change curve is shown;
FIG. 13 shows the use of a higher levelA time gain voltage mapping curve;
FIG. 14 is a schematic view of an embodiment employingA time-increasing voltage mapping curve;
FIG. 15 shows the use ofA time-increasing voltage mapping curve;
FIG. 16 is a flow chart of a second embodiment of the present invention;
FIG. 17 is a hardware execution platform solution according to an embodiment of the present invention;
FIG. 18 is a graph showing the results of an efficiency test according to an embodiment of the present invention;
fig. 19 is an audio distortion test result according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
The highest supply voltage is first described in connection with fig. 3The effect on the performance of the dynamic power supply power amplifier system is shown in the horizontal axis of FIG. 3 as the input power of the RF power amplifier(dBm) and the vertical axis is the gain of the RF amplifier(in dB) curve family 21 is different drain DC supply voltagesLower gain with input power, wherein the leakage voltageThe trend of the curve family 21 is that the curve family 21 is reduced at the high end of the input power (namely gain compression) and is increased along with the rising of the drain voltage at the same input power when the interval is changed from 19V to 35V.
The mapping relation of the dynamic power supply system needs the working point when the peak envelope input is needed, namely the highest drain voltage adopted when the rated peak envelope output power is reachedAnd thereby determine the gain of the peak packet power point and the gain compression for a constant peak output power(e.g. 53 dBm), byThe output power lines are straight lines with a slope of-1, such as the straight line 22 in FIG. 3, it can be seen that the straight line 22 (i.e., the same output power) has a plurality of intersections with the gain curve family 21, each intersection corresponding to a selectable one。
For example, the corresponding drain voltage at the intersection 23 is 33V, if this is taken as the maximum value of the dynamic supply voltage, i.eThe gain of the radio frequency power amplifier at the peak envelope isThe corresponding gain compression amountThe method comprises the steps of carrying out a first treatment on the surface of the Similarly, the intersection point 24 corresponds toGain, gainGain compression amountThe method comprises the steps of carrying out a first treatment on the surface of the Corresponding to the intersection point 25Gain, gainGain compression amount。
The voltage mapping algorithm controls the supply voltage Vd to be applied to all input signal amplitudes (corresponding to different signal amplitudes) The gain of the lower power amplifier should be kept constant, if the intersection point 23 is chosen as the peak envelope operating point, then it is necessary to ensureThe gain in the dynamic range is a constant straight line 26 whose intersection with the family of curves 21 can be seen asThe compression amount corresponding to the intersection point of each gain curve is smaller and smaller towards the left side of the intersection point 23, so that the radio frequency power amplifier works in a state of lighter compression, and the final average efficiency is lower; if the intersection point 24 is selected as the peak envelope working point, not only the power amplifier at the intersection point 24 is in a saturated state, but also each point on the equal gain straight line 27 at the left side of the intersection point 24 is greatly compressed, so that the final average efficiency of the power amplifier is far higher than that of the intersection point 23; it is evident that the intersection point 25 is in deep saturation and the corresponding constant gain line 28 will achieve a higher efficiency than in the first two cases, and thereforeThe selection of (2) directly affects the efficiency of the power amplifier.
In addition, in the case of the optical fiber,if the power amplifier is made to enter deep saturation, the risk of overdriving the grid electrode or overvoltage of the drain electrode of the power tube is brought, and the optimization is automatically searchedThe algorithm of the power tube is to obtain the optimal power amplification efficiency under the condition of ensuring the safety and reliability of the power tube.
Embodiment one:
an embodiment of a voltage mapping establishment method for a dynamic power amplifier system according to the present invention is shown in fig. 4, and includes the following steps:
step 31: selecting an initial valueDefining a reference mapping curveDetermining an initial voltage mapping relationship。
Specifically, initiallyThe value can be selected according to experience and design of a dynamic power amplifier system, and can be generally set as the maximum value or the intermediate value of the power supply voltage.
Defining a reference mapping curveIndependent variable of the curveIs the envelope of the input signal,corresponding to the power supply voltage of the power amplifier,is thatWhen a reference curve is determined, the dynamic power supply power amplification system can be tested in advance under standard environmental conditions, and the power amplification characteristics in the ideal compression state and efficiency are selected as the reference curve; the form of the curve may also be selected empirically.
The reference curve of one of the present embodiments is defined as a broken line:，
wherein the method comprises the steps ofThe peak value of the corresponding envelope is,for the inflection point envelope value,as shown in fig. 5, when the input signal envelope is smaller thanWhen the power supply voltage is not reduced any more and is kept at a constant valueThis is to ensure that the power supply voltage of the rf power tube is not too low to affect its performance.
Another reference curve of the present embodiment is defined as a polynomial，
Wherein K is a natural number (generally 1 to 3),as a result of the fact that the coefficients are,corresponding to the envelopeThe peak value of the peak value is,for the inflection point envelope value,fig. 6 shows a quadratic curve of k=2, and the expression is:。
step 32: adjusting radio frequency link gainThe output power of the power amplifier reaches the target value.
The gain of the RF link is variable, and is adjusted by a digital or analog control port to set the target output power asThe current output power isThe gain adjustment method of the present embodiment is。
Step 33: the output feedback signal envelope is read and its error from the original input signal envelope is calculated.
In particular, for an input envelopeAnd outputting a feedback envelopeSampling to obtain N (N is a natural number) pair of sampled dataWill beAnd (3) withAfter time delay alignment is carried out, calculating the error between the two is as follows:。
step 34: determination of errorWhether the threshold is smaller than or equal to the threshold, if yes, go to step 351; otherwise, step 352 is performed.
The relative mean square error of the envelope corresponding to the threshold here determines the envelope distortion after iteration convergence, and the threshold is generally not greater than 1/1000.
Step 351: and (3) evaluating the position relation between the current mapping curve and the reference mapping curve, and then executing step 3.6.
Defining a current mapping curveMapping curve with referenceThe positional relationship between the two is three:
and (3) withOverlapping,Is positioned atTop and bottomIs positioned atBelow.
Specifically, the first relative position determination of the present embodimentThe method comprises the following steps: defining tolerancesIs real, ifThe two are coincident; if it isThenIs positioned atIs above of (2); if it isThenIs positioned atIs below (c). An example of this determination is shown in FIG. 7, where 51 is a reference map curve if the current map curve is above and below the reference map curveIn the wide shadow region 52, the two are coincident; if the current mapping curve is located in the upper shaded area 53, then a decision is madeIs positioned atIs above of (2); in the lower hatched area 54, a determination is madeIs positioned atIs below (c).
Another relative position judging method of the present embodiment is to calculate
（1）
Defining tolerancesIs a real number; if it isThe two are overlapped; if it isThenIs positioned atIs above of (2); if it isThenIs positioned atEquation (1) is equivalent to using the current mapping curveSubtracting the reference map from the area enclosed by the transverse axisFor the area difference around the horizontal axis, as shown in fig. 8, 61 is the reference map, 62 is the current map,equivalent to the area S1 of the area 631, the area S2 of the area 632 is subtracted, and the area S3 of the area 633 is added, this method can avoid misjudgment of the positional relationship due to local curve staggering of the area 632 in fig. 8.
The third relative position determination method of the present embodiment is to calculate
（2）
Defining tolerancesIs a real number; if it isThe two are overlapped; if it isThenIs positioned atIs above of (2); if it isThenIs positioned atThe method is described with reference to FIG. 9, in which 71 is the reference map and 72 is the current map, and the determination method is equivalent to using the current mapTwo points are connected with a straight line 73, the slope of the reference map 72 and the slope of 73 are calculated, and the difference between the two isIf the slope of the reference map is greater than the current map when the current map is above the reference map, thenAnd vice versa.
Step 352: output feedback signal envelope and original input signal envelope together calculate power amplifier gainAnd according to->Correcting the mapping curve; and then returns to step 32.
In this embodiment, the input signal envelope and the output signal are sampled respectively, and after time delay alignment, N (N is a natural number) pairs of sampled data are obtainedCalculation ofObtaining the gain corresponding to the peak envelopeLet the current voltage mapping function beCalculate at N sampling pointsObtaining N pairs of dataThe method comprises the steps of carrying out a first treatment on the surface of the Further fitting the N data by using an M-order polynomial (M is a natural number and is generally taken as 2-7) to obtain a mapping relation，Is a polynomial coefficient; by usingReplacing original mappingsI.e.。
Step 36: judging whether the current mapping curve coincides with the reference mapping curve or not; if the mapping relation is coincident, the current mapping relation is maintained, iteration is exited, and the mapping process is completed; if not, step 37 is performed.
Description when two curves overlapThe power amplifier reaches the compression state corresponding to the reference mapping, the mapping relation ensures that the mean square error between the input envelope and the output envelope is smaller than the set threshold, so that the mapping process is successful and the iteration can be ended.
Step 37: determining whether the current mapping curve is above the reference curve, if so, performing 371, and reducingThe method comprises the steps of carrying out a first treatment on the surface of the If not, 372 is executed, add。
One of the present embodimentsThe adjustment scheme is to preset a voltage adjustment step distanceReduction ofIn the time-course of which the first and second contact surfaces,the method comprises the steps of carrying out a first treatment on the surface of the Increase inIn the time-course of which the first and second contact surfaces,whereinTo be new after change，Is as the origin，Can be selected according to the requirements of experience and total time consumption of iteration, and is generally 0.1-0.5V.
Another of the present embodimentsThe adjustment scheme is calculated according to the formula (1) or (2)After that, correctWhereinIs real, according toDefinition of (1) whenIs positioned atUpper part of (2)Therefore, it isVoltage decreases and vice versa, whereIs to adjust the step pitch ofCoefficient ofCan be selected according to the requirements of experience and total time consumption of iteration, and is generally 0.5-1V.
Step 38: according toDoubly correcting the current mapping curve and the reference curve, returning to step 32, i.e. +.>Scaling the original mapping relation to ensure that the highest corrected power supply voltage is +.>。
In step 37 of the present embodiment, the position relationship between the current mapping curve and the reference mapping is adjustedThe principle is explained by the following through fig. 10 to 15:
fig. 10 is a remark made to fig. 4 to more clearly illustrate the characteristics of the family of curves, from which it can be seen that:
1) The highest value of the linear gain increases with increasing supply voltage. For example, curve 81 in the figure is the supply voltageThe gain curve of (1) reaches the highest gain at 811, the left gain of 811 does not change much, called the linear region, the right gain of 811 starts to decrease, becomes the compression region, and curve 82 is the supply voltage +.>The curve reaches a maximum gain at 821, it is evident that the linear maximum gain of 82 is less than the maximum gain of 81.
2) The rate of change of the gain of the linear region with voltage is much smaller than the rate of change of the compression region. Typically 20dBm of input power as at 83 of figure 10,increasing from 19V to 35V, the gain increases by about 1dB; while at an input power of 30dBm, shown at 84, the gain is in the compression region, the sameThe range of variation corresponds to a gain variation of up to 4dB.
Analyzing differences based on the two characteristicsThe characteristics of the voltage mapping curve, FIG. 11 illustrates the selection of three typesTime gain compression and peak gainThe highest supply voltage corresponding to curve 91 isThe intersection with the output power line 94 is 911, and the corresponding peak gain isThe method comprises the steps of carrying out a first treatment on the surface of the Corresponding to the same curve 92、Curve 93 corresponds to、Shown in the figureTherefore, it is。
FIG. 12 is a selectionAnalysis of the dynamic supply voltage variation range shows that 101 (corresponding to 91 in FIG. 11) isA gain curve at the peak input power 103 corresponding to a gain of(1011) When the input power is reduced, the supply voltage is supplied for maintaining the efficiencyAnd consequently decreases. As described above, the maximum gain of the linear region decreases with decreasing supply voltage, which will necessarily occurAt a certain voltageWhen the gain curve 1031 is tangent to the constant gain straight line 102, the input power corresponding to the tangent point is 104; at an input power of less than 104, the power cannot be reduced any moreOtherwise, the constant gain cannot be maintained lowThe aboveThe relationship with input power is shown in FIG. 13, where the maximum of the 105-segment curve is at input power 103When the input power is between 103 and 104,as the input power decreases; when the input power is less than 104Is constant.
If the highest supply voltage is selected asMapping relation andis similar to the principle of FIG. 14, in which 111 isThe mapping curve at the time is referred to as 112, the highest voltage isIs provided with a mapping curve of，According to the characteristics of the gain curve described above, the linear region requires a larger voltage variation range, i.e., when the same gain is variedIn combination with the monotonic nature of the curve, it is then necessary to have a conclusion that curve 111 is above 112.
Selecting the highest voltage asWhen the voltage map is shown as 121 in FIG. 15, 121 must be located according to the above analysisBelow the corresponding voltage mapping curve 122, fig. 15 will also be shownThe corresponding mapping curves 123 are plotted together for comparison.
If in order toThe corresponding mapping curve 122 is a reference mapping, it can be seen that whenWhen the mapping curve is located above 122, and vice versa, it can be determined according to the relative position between the current mapping and the reference mappingIs increased or decreased.
Embodiment two:
fig. 16 is a diagram illustrating a second embodiment of a voltage mapping method for a dynamic power amplifier system according to the present invention, and the following description will be given only with respect to the first embodiment thereof:
step 134: judging whether the error is less than or equal to the threshold valueIf yes, go to step 1351; otherwise, step 1352 is performed.
As an important feature of the present invention, the error threshold is hereinTo distinguish the threshold values of the later stepsIn the present embodiment, takeIs to reduceThe number of steps of optimizing the mapping curve during the search iteration reduces the time complexity of the algorithm.
Steps 1351, 1352 are the same as steps 351, 352 of the first embodiment.
Step 136: judging whether the current mapping curve coincides with the reference mapping curve or not and the error is less than or equal toIf so, the current mapping is maintainedShooting relation, exiting iteration, and finishing the mapping process; if not, go to step 1371.
Step 1371: judging whether the error is greater thanIf yes, go to step 1352; otherwise, step 138 is performed.
Step 138: the same as step 37 of the first embodiment.
Steps 1381, 1382 are identical to steps 371, 372 of the first embodiment.
Step 139: as in step 38 of embodiment one.
Fig. 17 shows a hardware implementation platform scheme of the first embodiment and the second embodiment, including a signal processing platform 141, a radio frequency power amplifier 142, and a class S power amplifier 143.
The signal processing platform 141 takes an FPGA or DSP chip as a core, and implements the following functions based on software/firmware: the baseband signal generator 1411 generates a digital baseband in-phase (I)/quadrature (Q) signal, one path of which is delayed by the delay 1412, and after being up-converted to a radio frequency carrier by the quadrature modulator 1413, the digital-to-analog converter (DAC) 1414 converts the digital radio frequency signal into an analog radio frequency signal and outputs the analog radio frequency signal to the subsequent stage radio frequency power amplifier 142. The digital baseband I/Q generated by the baseband signal transmitter 1411 is also provided to an envelope detector 1415, which detects the envelope signal of the resulting digital baseband signalEnvelope signalConverted to a power supply control signal by envelope mapping module 1416And output to the class S power amplifier 143.
The class S power amplifier 143 efficiently supplies DC voltage from the DC power supplyIs converted to be proportional toHigh power supply voltage of (2)Providing dynamic power to the rf power amplifier 142.
The rf power amplifier 142 includes a Variable Gain Amplifier (VGA) 1421, the gain of which is controlled by a control signal Gp, and which amplifies an input rf signal to drive the power supply of the final power amplifiers 1422, 1422 to a dynamic voltageThe power amplification of the rf signal is completed, the amplified rf signal passes through the coupler 1423, the main path output of the coupler 1423 is used as the final rf output, the coupling end of the coupler obtains a coupled signal with power far smaller than that of the main path output, and the coupled signal is sent back to the feedback demodulation module 1418 in the signal processing platform 141.
The feedback demodulation module 1418 demodulates the coupled signal output by the coupler 1423 into the baseband digital domain and obtains an envelope of the demodulated signalA mapping module 1417 is an implementation structure of an embodiment of the present invention, where the mapping module 1417 is configured to determine a mapping of the input signal envelopeAnd feedback signal envelopeThe voltage mapping relation is established according to the method described in the embodiment of the invention, and the mapping relation is copied into the envelope mapping module 1416 to realize the input envelopeTo power controlIs mapped to the mapping of (a).
The final stage power amplifier 14 employed in the embodiment of the present invention22 is a 500W (carrier power) push-pull type AB amplifier, and the excitation signal is an amplitude modulation signal with a modulation degree of 100%. Error threshold of an embodiment，The total iteration time does not exceed 500ms.
FIG. 18 shows the measured efficiency of an embodiment of the present invention. The efficiency is defined as
When the carrier power is 500W (peak packet power is 2000W), the efficiency in the full frequency band of 2-30 MHz is more than 52%. Meanwhile, the radio frequency output signal is sent to an amplitude modulation signal analyzer, the tested audio distortion degree is shown in fig. 19, and the audio distortion degree in the full frequency band is less than 2.3%.
It should be noted that the hardware implementation shown in fig. 17 is only one implementation of the embodiment of the present invention, and the innovative content of the present invention is not dependent on this hardware implementation. In addition, what has been described above is merely some of the embodiments of the present invention. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention.
The invention relates to a voltage mapping establishment method for a dynamic power supply power amplification system, which is characterized in that amplitude gain is obtained through input and output envelopes, a mapping function relation is adjusted through deviation between the amplitude gain and ideal constant gain, two-stage error thresholds are respectively set for the highest power supply voltage iteration and the mapping function iteration, the number of steps required by the two iterations is reduced, the time complexity of an algorithm is reduced, and better engineering feasibility is realized.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (12)
1. A voltage mapping establishment method for a dynamic power supply power amplification system is characterized by comprising the following steps of: the method comprises the following steps:
s1) setting the highest supply voltageDefining a reference mapping curve +.>Wherein the argument->For inputting the envelope of the radio frequency signal->Supply voltage corresponding to power amplifier, < >>Is->Monotonically increasing function of (2) and satisfy +.>，/>Peak value of the input radio frequency envelope;
s2) enabling the dynamic power supply to be in voltage mapping relationProviding voltage to the radio frequency power amplifier and adjusting the gain of the amplifying link>The output power of the radio frequency power amplifier reaches a set value;
s3) reading envelope of power amplifier output signalAnd->Calculating gain after delay alignment>Further obtain peak envelope->Gain at->The method comprises the steps of carrying out a first treatment on the surface of the Calculate->And->Error between；
S4) judging errors, if the errors areIf the voltage is larger than the threshold value, correcting the voltage mapping curveExecuting step S2); otherwise, executing the step S5);
s5) calculating a current voltage mapping curveRelative position relation with reference mapping curve, judging:
if the two are coincident, the current mapping curve is kept, iteration is exited, and the mapping process is completed;
if it isIs positioned at->Above (2), decrease->Is that，/>Is a positive real number;
if it isIs positioned at->Is increased below->Is that；
Wherein the method comprises the steps ofFor new->，/>Is the origin->；
S6) correctionEnabling the dynamic power supply system to supply power to the radio frequency power amplifier according to the corrected mapping relation;
s7) adjusting the radio frequency link gainThe output power of the radio frequency power amplifier reaches a set value; returning to step S3).
2. The method for establishing the voltage mapping for the dynamic power amplifier system according to claim 1, wherein the method comprises the following steps: the step S4) is as follows:
s4) judging if the errorGreater than threshold->Then the voltage mapping curve is correctedExecuting step S2); otherwise, executing the step S5);
the step S5) is as follows:
s5) calculating a current voltage mapping curveRelative position relation with reference mapping curve, judging:
if it isAnd->Overlap, and error Err is less than or equal to threshold +.>Maintaining the current mapping curve, exiting the iteration, and finishing the mappingA shooting process; if the two are coincident but the error Err is greater than the threshold value +.>Then modify the voltage map +.>Executing step S2);
the threshold。
3. A voltage map building method for a dynamic power amplifier system according to claim 1 or 2, characterized in that: the reference map in the step S1)The definition is as follows:
wherein->Peak value of corresponding envelope, < >>For inflection envelope value, ++>。
4. A voltage map building method for a dynamic power amplifier system according to claim 1 or 2, characterized in that: in the step S5), the current voltage mapping curve is calculated by the following methodRelative positional relationship with reference map curve:
defining tolerancesIs real, if->，/>For the inflection point envelope value,then->Is positioned at->Is above of (2); if it isThen->Is positioned at->Is arranged below the lower part of the upper part; otherwise, the two are coincident.
5. The method for establishing the voltage mapping for the dynamic power amplifier system according to claim 1, wherein the method comprises the following steps: in the step S5), the current voltage mapping curve is calculated by the following methodRelative positional relationship with reference map curve: calculate->；
Defining tolerancesIs a real number; if->Maintaining the current mapping curve, exiting iteration, and finishing the mapping process; otherwise revise->Wherein->Is a real number.
6. The method for establishing the voltage mapping for the dynamic power amplifier system according to claim 1, wherein the method comprises the following steps: in the step S5), the current voltage mapping curve is calculated by the following methodRelative positional relationship with reference map curve: calculate->；
Defining tolerancesFor real numbers, defining an error threshold Th2; if->And->Maintaining the current mapping curve, exiting iteration, and finishing the mapping process; if->But->Then modify the voltage map +.>Executing step S7); if->Revision is performedWherein->Is a real number.
7. A voltage map building method for a dynamic power amplifier system according to claim 5 or 6, characterized in that: in the step S5), the following formula is calculated：/>，/>Is the inflection point envelope value.
8. The method for establishing the voltage mapping for the dynamic power amplifier system according to claim 1, wherein the method comprises the following steps: the saidAnd->Error between->Is mean square error, i.e.)>Where N is a natural number and N is also the number of points sampled.
9. The method for establishing the voltage mapping for the dynamic power amplifier system according to claim 8, wherein the method comprises the following steps: the positive voltage map is modified in the step S4)The method of (1) is as follows: for->Input envelope sample points +.>，/>Calculate->Obtaining N pairs of dataThe method comprises the steps of carrying out a first treatment on the surface of the Fitting the N data by using an M-order polynomial, wherein M is a natural number and is taken as 2-7, so as to obtain a mapping relation +.>，/>Is a polynomial coefficient; use->Replacing original mappingsI.e. +.>。
10. The method for establishing the voltage mapping for the dynamic power amplifier system according to claim 9, wherein the method comprises the following steps: the step S7) is as follows: judging whether the total iteration step number exceeds the standard, if so, exiting iteration and giving a prompt; otherwise: the iteration step number is added with 1, and the gain of the radio frequency link is adjustedAnd (3) enabling the output power of the radio frequency power amplifier to reach a set value, and returning to the step (S3).
11. The method for establishing the voltage mapping for the dynamic power amplifier system according to claim 9, wherein the method comprises the following steps: the step S7) is as follows: judgingWhether or not it is true, beta is a real number greater than 1, if so, and +.>If the limit value is reached, the iteration is exited, and a prompt is given; otherwise, adjusting the radio frequency link gain +>And (3) enabling the output power of the radio frequency power amplifier to reach a set value, and returning to the step (S3).
12. A voltage map building method for a dynamic power amplifier system according to claim 1 or 2, characterized in that: the step S1) sets the highest supply voltageThe envelope of the input radio frequency signal is +.>Defining a reference mapping curve->Wherein K is a natural number, and is 1-3%>Is a real coefficient->，/>Peak value of corresponding envelope, < >>For the inflection point envelope value,。
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| GB9824019D0 (en) * | 1997-12-31 | 1998-12-30 | Motorola Inc | Method,device,phone and base static for providing envelope-following for variable envelope radio frequency signals |
| CN115333485A (en) * | 2022-07-19 | 2022-11-11 | 昆山九华电子设备厂 | Dynamic power supply system for radio frequency power amplifier and control method |
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| GB9824019D0 (en) * | 1997-12-31 | 1998-12-30 | Motorola Inc | Method,device,phone and base static for providing envelope-following for variable envelope radio frequency signals |
| CN115333485A (en) * | 2022-07-19 | 2022-11-11 | 昆山九华电子设备厂 | Dynamic power supply system for radio frequency power amplifier and control method |
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