CN1119870C - Adaptive digital jitter signal control method and MF emitter in the said method - Google Patents
Adaptive digital jitter signal control method and MF emitter in the said methodInfo
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- CN1119870C CN1119870C CN 00122789 CN00122789A CN1119870C CN 1119870 C CN1119870 C CN 1119870C CN 00122789 CN00122789 CN 00122789 CN 00122789 A CN00122789 A CN 00122789A CN 1119870 C CN1119870 C CN 1119870C
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Abstract
The present invention provides a method for adaptive digital dither signal control and a medium frequency transmitter. The traditional method has the defect that due to the invariance in the whole process, provided dither signals can not be adapted to the variation of environments and input signals. In the method of the present invention, a feedback branch is added on the basis of the traditional method, namely to carry out analog-digital conversion to mimic imput signals to generate feedback digital input signals. The feedback digital input signals are compared with mixed input signals to generate control signals, and the control signals are utilized to control the generation of digital dither signals. The present invention also provides a medium frequency transmitter utilizing the control method.
Description
Technical field
The present invention relates to telecommunication technology, specifically, relate to a kind of control method of adaptive digital shake (dither) signal and the digital intermediate frequency transmitter that has utilized this adaptive digital jitter signal control method.
Background technology
The digitlization that is brought by the develop rapidly of large scale integrated circuit (VLSI) is a principal character of the information technology that grows in intensity now, it be reflected on the radio communication equipment be digital device more and more near antenna, the benefit that this trend is brought be produce easy, with low cost, function is more, performance is better.
In the MF transmitter of this wireless system, digital up converter (DUC) and digital to analog converter (DAC) are the functional parts of two keys.They will change into analog if signal by digital to analog converter with digital medium-frequency signal after will carrying out up-conversion through the signal of Base-Band Processing, digital modulation again, deliver to follow-up radio-frequency module then.The performance index of digital to analog converter (mainly refer to signal to noise ratio snr and no false dynamic range SFDR) are the first order that determines the radiofrequency signal quality of launching from antenna opening.Wherein the most difficult satisfied with the index of not having false dynamic range (SFDR) again.
Improvement for the false dynamic range index of the nothing of digital to analog converter, except adopting the better chip of performance index, providing the high accuracy clock etc., a kind of noticeable method is to add dither signal (Dither Signal) in useful signal, its principle is: in analog to digital converter, its nonlinear characteristic has certain regularity.Be reflected on the frequency spectrum is that some harmonic waves and spuious than higher are arranged.By adding the Dither signal, can break above-mentioned regularity, made an uproar (Noise floor) in the spuious end that is depressed in the digital to analog converter output, thus the nonlinear characteristic of improvement system, the SFDR index of raising system.The Dither signal comprises two kinds of broadband Dither and arrowband Dither.Wherein using more is arrowband Dither.
In common Dither used, general method was to find best Dither signal by test, and each parameter is solidificated in circuit and the design.This method has some following problems:
1, for different D/A converting circuits and chip, corresponding best Dither signal is different.In circuit and design, certain difference is arranged also so.The versatility that so just means circuit is bad, and the Dither circuit and the design that are used for certain digital-to-analog circuit can not be indiscriminately imitated another D/A converting circuit fully.
2, for the analog-digital chip and the circuit of same type, also there is certain difference between Different Individual, in the Dither of this curing design, can't reflects this species diversity.
3, along with the variation of environment (as temperature etc.), the performance of D/A converting circuit and chip also has corresponding variation, and the Dither design of curing can't adapt to this variation.
4, the effect of Dither and input signal have certain relation, and the Dither signal of curing can't be followed the tracks of the variation slowly of input signal.
Not considering above all factors in traditional method, on the one hand is because original system is not very high to the requirement of the linearity, then is because real time altering Dither signal is rather difficult on the other hand.And in the wireless system in modern times, it is very high requiring for the linearity of whole passage, and wherein the linearity of digital to analog converter plays a part quite, therefore, needs to consider above various factors.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of control method of adaptive digital jitter signal, this method can be adjusted the digital jitter signal of generation adaptively according to different D/A converting circuits, environment and input signal, so that best digital jitter signal to be provided.
Another object of the present invention is to provide the digital intermediate frequency that utilizes above-mentioned this adaptive digital jitter signal control method transmitter, this MF transmitter can be according to the different D/A converting circuit of its use, the environment of use and the digital jitter signal that input signal is controlled adaptively, so that the digital jitter signal of the best is provided for D/A converting circuit.
According to above-mentioned purpose, the control method of adaptive digital jitter signal provided by the invention comprises the following step:
A. produce the initial number dither signal;
B. described digital jitter signal is also mixed with the input signal up-conversion, produce intermediate frequency mixing input signal;
C. intermediate frequency mixing input signal is carried out digital-to-analogue conversion, produce simulation and mix input signal;
D. simulation is mixed input signal and carry out intermediate frequency filtering, the filtering out of band signal produces analog input signal;
E. analog input signal is carried out analog-to-digital conversion, produce the feedback digital input signal;
F. described feedback digital input signal is composed estimation with above-mentioned intermediate frequency mixing input signal, produce control signal;
G. utilize this control signal, the generation of control figure dither signal; Get back to step b then, so circulation.
According to another object of the present invention, digital intermediate frequency transmitter provided by the invention comprises:
Base Band Unit is used to provide digital input signals;
Dither signal generator is used to provide dither signal;
Upconverter, the digital input signals that is used for Base Band Unit is provided carries out up-conversion, produces the intermediate frequency digital input signals;
Blender mixes the described dither signal that described dither signal generator provides with the described intermediate frequency digital input signals that described upconverter produces, produce intermediate frequency mixing input signal;
Digital to analog converter carries out digital-to-analogue conversion with mixed intermediate frequency mixing input signal, produces simulation and mixes input signal;
Intermediate-frequency filter links to each other with described digital to analog converter, and the filtering simulation mixes the intermediate-freuqncy signal in the input signal, produces analog input signal;
Radio frequency unit receives the analog input signal that described intermediate-frequency filter produces, and carries out radio frequency processing,
Described digital intermediate frequency transmitter also comprises feedback branch, and this feedback branch comprises:
Analog to digital converter links to each other with described intermediate-frequency filter, and the analog input signal that described intermediate-frequency filter is produced carries out analog-to-digital conversion, produces the feedback digital input signal;
Adaptive controller, link to each other with the output of described upconverter and the output of described analog to digital converter, the feedback digital input signal that is used for producing according to described analog to digital converter is composed estimation with the intermediate frequency mixing input signal that described blender produces, produce control signal, this control signal is input in the described dither signal generator, is used to control described dither signal generator and produces dither signal.
Description of drawings
Fig. 1 is the flow chart of adaptive digital jitter signal production method of the present invention;
Fig. 2 is the formation block diagram of digital intermediate frequency transmitter of the present invention;
Fig. 3 is an example of adaptive controller 90 among Fig. 2;
Fig. 4 is the further circuit block diagram of upconverter among Fig. 2, Dither signal generator and blender.
Embodiment
Describe embodiments of the invention in detail below in conjunction with accompanying drawing.
Fig. 1 is the flow chart of adaptive digital jitter signal control method of the present invention.Following elder generation is according to the flow process of this flow chart description the inventive method.As shown in Figure 1, produce initial Dither signal (step S1) with traditional method earlier; Then, at step S2, the input signal that this initial Dither signal and front end Base Band Unit are come carries out up-conversion and mixes, and obtains intermediate frequency mixing input signal.The same with conventional method, this intermediate frequency mixed signal is carried out digital-to-analogue conversion, convert simulation to and mix input signal (step S3).These steps are the same with traditional Dither signal that adds in input signal with the method for the SFDR index of improving digital to analog converter.Then, behind step S3, simulation mixing input signal is offered intermediate-frequency filter carry out filtering, obtain analog input signal (step S4).The radio frequency unit of level was launched after traditional method just offered this analog input signal.
The front is mentioned, and the deficiency that this traditional method exists is that the Dither signal that initially provides is constant in whole process, and the variation that can not conform and the variation of input signal can't improve the SFDR index of digital to analog converter best.
Characteristic point of the present invention is, in the radio frequency unit that the analog input signal behind the step S4 intermediate frequency filtering is offered the back level, also this analog input signal is taken out, and carries out analog-to-digital conversion, obtains feedback digital input signal (step S5).Then, the intermediate frequency mixing input signal of this feedback digital input signal with step S2 output compared, produce control signal (step S6).At last at step S7, the generation of the Dither signal that utilizes this control signal to control to be input to upconverter in other words, is adjusted the generation of Dither signal.
From said method of the present invention, the present invention is on the basis of original method, increased a feedback step, according to feedback signal, adjust the parameter of Dither signal adaptively, thereby make the Dither signal of generation can adapt to the variation of digital to analog converter and environmental change and input signal best.
The main flow process of the control method of adaptive digital Dither signal of the present invention has been described above.Below in conjunction with Fig. 2 the digital intermediate frequency transmitter that has utilized above-mentioned adaptive digital Dither signal control method of the present invention is described.
Fig. 2 is the structured flowchart of digital intermediate frequency transmitter of the present invention.As shown in Figure 2, traditional digital intermediate frequency transmitter mainly comprises Base Band Unit 10, Dither signal generator 20, upconverter 30, blender 40, digital to analog converter 50, intermediate-frequency filter 60 and radio frequency unit 70.Base Band Unit 10 provides input signal, and upconverter 30 up-converts to the intermediate frequency input signal with input signal.In blender 40, the intermediate frequency input signal that upconverter 20 is exported mixes with the Dither signal that Dither signal generator 20 produces, output intermediate frequency mixing input signal.Digital to analog converter 50 carries out digital-to-analogue conversion with intermediate frequency mixing input signal, produces simulation and mixes input signal.Simulation the mixings input signal of intermediate-frequency filter 60 logarithmic mode transducers 50 output carries out filtering, the filtering out of band signal, the while also filtering in blender 40, be mixed into the Dither signal of input signal.The MF transmitter of traditional structure just offers radio frequency unit 70 to the analog input signal of intermediate-frequency filter 60 outputs and carries out radio frequency processing.
The problem that the digital intermediate frequency transmitter of this traditional structure exists is the same with above-described conventional method, be that the Dither signal that Dither signal generator 20 provides is constant in whole process, the variation that can not conform and the variation of input signal can't improve the SFDR index of digital to analog converter 30 best.
Corresponding with said method, the characteristics of MF transmitter of the present invention are, as shown in Figure 2, have increased an analog to digital converter 80 and adaptive controller 90.The output signal of intermediate-frequency filter 60 is told one the tunnel, offer analog to digital converter 80.Analog to digital converter 80 converts this analog input signal to digital signal again, as the feedback digital input signal, offers adaptive controller 90.Adaptive controller 90 has two inputs, and an input is used to receive the feedback digital input signal of analog to digital converter 80 outputs; Another input is used for linking to each other with the output of blender 40, is used for receiving the intermediate frequency mixing input signal (this signal includes the Dither signal) of blender 40 outputs.Then, adaptive controller 90 compares the feedback digital input signal with intermediate frequency mixing input signal, produce control signal, and this control signal offered Dither signal generator 20, be used to control the Dither signal that Dither signal generator 20 produces, progressively to produce the best Dither signal that is adapted to digital to analog converter 50.
In the above example, Dither signal generator 20 is arranged with upconverter 30 branches.But should be appreciated that in other embodiment also these two parts can be combined, Fig. 4 shows a kind of functional block diagram with upconverter of last Dither signal generation function.
As shown in Figure 4, the upper part among Fig. 4 is actually the Dither signal generating circuit, and it comprises: tandom number generator 201 is used to produce the random number signal.In real example, it can be a m-sequence generator, also can be the random number sequence generator of other any ways; Coefficient storage finite impulse response filter (Finite Impulse response) 202; Cascaded integrator-comb interpolation filter 203, this filter can will become the digital signal of higher rate than the digital signal of low rate with less resource and acceptable performance, this filter 203 also can adopt the mode of a plurality of cascade integral comb filter cascades, to increase application flexibility; Digital controlled oscillator 205 is used for producing the digital intermediate frequency oscillator signal of plural number (two-way quadrature); Multiplier 204 is used for the signal of cascaded integrator-comb interpolation filter 203 outputs and the plural digital intermediate frequency oscillator signal of digital controlled oscillator 205 outputs are multiplied each other, with output high-frequency narrow-band Dither signal.
The latter half among Fig. 4 is a up-converter circuit, realizes upconversion function.It can comprise the multichannel up-converter circuit, and the input signal that Base Band Unit 10 is provided carries out up-conversion, obtains the intermediate frequency input signal.Then, the Dither signal with the output of Dither signal generating circuit in adder 206 (corresponding to the blender among Fig. 2 40) mixes with the intermediate frequency input signal of up-converter circuit output, obtains intermediate frequency mixing input signal.
The control signal of adaptive controller 90 outputs offers the digital controlled oscillator 205 and the coefficient storage finite impulse response filter 202 of Dither signal generating circuit, control the frequency of oscillation of digital controlled oscillator 205 and the coefficient of coefficient storage finite impulse response filter 202 respectively, reach and revise the purpose that the Dither signal parameter is provided with, thereby adjust the Dither signal of output, with self adaptation different digital to analog converter and the variation of environment and the variation of input signal.
An example of the adaptive controller 90 of Fig. 2 has been shown among Fig. 3.As shown in Figure 3, adaptive controller 90 mainly comprises two parts: a part is a signal spectra estimation unit 901, and another part is a self-adaptive controller 902.The distribution of the feedback digital input signal that signal spectra estimation unit 901 is exported for the intermediate frequency mixed signal (being digital-to-analogue conversion signal before) and the analog to digital converter 80 of upconverter 30 outputs (being the signal after the digital-to-analogue conversion) is handled, draw corresponding spectrum and estimate, and estimated result is transferred to self-adaptive controller 902.In fact self-adaptive controller 902 has comprised the algorithm of adaptive control.By a series of calculating, just can export control signal and change the Dither signal.
This adaptive process should comprise two stages:
Phase I: self adaptation finds corresponding to the parameter setting of the Dither of the best of digital to analog converter at present.In fact its performance of Dither signal in certain scope all differs trickleer, as long as this stage finds approximate location just passable.In fact this step is equivalent to the process of a coarse adjustment.
Second stage: the variation of tracking signal adaptively by fine revising the setting of Dither signal, obtains best effect.Because along with the variation of signal, the setting of best Dither signal also has small difference.
Below to adjust the Dither signal frequency, the algorithm of adaptive control is described.But adjustable controlled quentity controlled variable should not exceeded with signal frequency, does not break away from the category of the inventive method.For example, the adjustable controlled quentity controlled variable of Dither signal generator also comprises bandwidth, amplitude etc., and its control method can draw on the basis of foregoing fully for the those skilled in the art in present technique field.
Because signaling zone occupies the frequency range of broad in spectrum, and considers the requirement of filter, the frequency resource that can be used for the Dither signal is limited.When changing, to consider restriction to the Dither signal.
1. set initial Dither frequency f (1) and initial change value delf (1), initial intermediate variable s (1), what this variable characterized is the changing value of preceding SFDR several times.
2. cycle calculations changes the variation of the effect of the Dither that causes the i time, and calculates frequency change value next time, decides the frequency of digital Dither next time.
If the i time the changing value of current sfdr is delsf (i) after the SFDR value that obtains behind the analysis of spectrum is sfdr (i).
S (i+1)=(s (i)+sfdr (i))/2 then
delsf(i)＝sfdr(i)-s(i)
delf(i)＝sig(delsf(i))*(a(i)*delf(i)+delf2)
f(i+1)＝f(i)+delf(i)
Wherein sig (.) is a sign function, a be one less than 1 positive number.Delf2 is a fixing little biasing, and much smaller than delf (1), this part is used for the variation of tracking signal.Surpassed the scope that allows as the Dither signal, it has been made as boundary value.Can see the decisive role of delf (i) meeting in the early stage, and guide the Dither convergence signal, notice that this optimum position is not a fixing position in the optimum position, but in some scopes.Can play a part tracking signal at later stage delf2 changes.And the Dither signal is constantly changed within the specific limits.
Claims (7)
1, a kind of control method of adaptive digital jitter signal comprises the following step:
A. produce the initial number dither signal;
B. described digital jitter signal is also mixed with the input signal up-conversion, produce intermediate frequency mixing input signal;
C. intermediate frequency mixing input signal is carried out digital-to-analogue conversion, produce simulation and mix input signal;
D. simulation is mixed input signal and carry out intermediate frequency filtering, the filtering out of band signal produces analog input signal;
E. analog input signal is carried out analog-to-digital conversion, produce the feedback digital input signal;
F. described feedback digital input signal is composed estimation with above-mentioned intermediate frequency mixing input signal, produce control signal;
G. utilize this control signal, the generation of control figure dither signal; Get back to step b then, so circulation.
2, the method for claim 1 is characterized in that, in described step f, described feedback digital input signal and described intermediate frequency mixing input signal are composed estimation, draw the false dynamic range of nothing of digital-to-analogue conversion process,, produce control signal according to described no false dynamic range.
3, method as claimed in claim 1 or 2 is characterized in that, in described step g, utilizes described control signal, by the frequency of control figure dither signal, and the generation of control figure dither signal.
4, method as claimed in claim 1 or 2 is characterized in that, in described step g, utilizes described control signal, by the bandwidth or the amplitude of control figure dither signal, the generation of control figure dither signal.
5, digital intermediate frequency transmitter comprises:
Base Band Unit is used to provide digital input signals;
Dither signal generator is used to provide dither signal;
Upconverter, the digital input signals that is used for Base Band Unit is provided carries out up-conversion, produces the intermediate frequency digital input signals;
Blender mixes the described dither signal that described dither signal generator provides with the described intermediate frequency digital input signals that described upconverter produces, produce intermediate frequency mixing input signal;
Digital to analog converter carries out digital-to-analogue conversion with mixed intermediate frequency mixing input signal, produces simulation and mixes input signal;
Intermediate-frequency filter links to each other with described digital to analog converter, and the filtering simulation mixes the intermediate-freuqncy signal in the input signal, produces analog input signal;
Radio frequency unit receives the analog input signal that described intermediate-frequency filter produces, and carries out radio frequency processing,
It is characterized in that,
Described digital intermediate frequency transmitter also comprises feedback branch, and this feedback branch comprises:
Analog to digital converter links to each other with described intermediate-frequency filter, and the analog input signal that described intermediate-frequency filter is produced carries out analog-to-digital conversion, produces the feedback digital input signal;
Adaptive controller, link to each other with the output of described upconverter and the output of described analog to digital converter, the feedback digital input signal that is used for producing according to described analog to digital converter is composed estimation with the intermediate frequency mixing input signal that described blender produces, produce control signal, this control signal is input in the described dither signal generator, is used to control described dither signal generator and produces dither signal.
6, digital intermediate frequency transmitter as claimed in claim 5, it is characterized in that, described adaptive controller comprises spectral estimation unit and self-adaptive controller, described spectral estimation unit is composed estimation to described feedback digital input signal and described intermediate frequency mixing input signal, draw the false dynamic range of nothing of digital-to-analogue conversion process, according to described no false dynamic range, produce control signal.
7, digital intermediate frequency transmitter as claimed in claim 5, it is characterized in that, described dither signal generator comprises the tandom number generator that is used to produce the random number signal, the coefficient storage finite impulse response filter, to become the cascaded integrator-comb interpolation filter of the digital signal of higher rate than the digital signal of low rate, the signal that is used to produce the digital controlled oscillator of plural digital intermediate frequency oscillator signal and is used for described cascaded integrator-comb interpolation filter is exported and the plural digital intermediate frequency oscillator signal of described digital controlled oscillator output multiply each other, with the multiplier of output high-frequency narrow-band dither signal.
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| CN101273529B (en) * | 2005-09-30 | 2013-09-18 | Nxp股份有限公司 | System and method for adjusting dither in a delta sigma modulator |
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| JP5866375B2 (en) | 2010-12-17 | 2016-02-17 | スリーエム イノベイティブ プロパティズ カンパニー | Fluorine-containing polymers containing sulfinate-containing molecules |
| CN107040214B (en) * | 2017-03-03 | 2021-01-29 | 北京东方计量测试研究所 | Low stray sinusoidal signal generator based on multi-point compensation scheme |
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| CN101273529B (en) * | 2005-09-30 | 2013-09-18 | Nxp股份有限公司 | System and method for adjusting dither in a delta sigma modulator |
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