CN103780206A - Feedback link and implementation method thereof - Google Patents
Feedback link and implementation method thereof Download PDFInfo
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- CN103780206A CN103780206A CN201210410104.0A CN201210410104A CN103780206A CN 103780206 A CN103780206 A CN 103780206A CN 201210410104 A CN201210410104 A CN 201210410104A CN 103780206 A CN103780206 A CN 103780206A
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- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
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Abstract
The embodiment of the invention discloses a feedback link and an implementation method thereof, and relates to the field of communication. Radiofrequency output signals can be accurately sampled without depending on the performance of an ADC. According to the specific scheme, the feedback link is applied to a radiofrequency amplification circuit, and the radiofrequency amplification circuit receives original main signals, amplifies and processes the original main signals and then outputs first output signals comprising main signals and spurious signals; the feedback link comprises a first power regulator, a coupler, a first ADC and a DSP, wherein the input end of the first power regulator is connected with the output end of the coupler, the input end of the coupler is connected with the output end of the radiofrequency amplification circuit, the input end of the first ADC is connected with the output end of the first power regulator, the output end of the first ADC is connected with the input end of the DSP, and the output end of the DSP is connected with the input end of the radiofrequency amplification circuit. The feedback link and the implementation method thereof are applied to the implementation process of the feedback link.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of feedback link and its implementation.
Background technology
In communication system, improve the transmitting power of radio-frequency module by radio frequency amplifying circuit, for energy-saving and cost-reducing, power amplifier is generally operational in inelastic region, therefore in the time amplifying linearly modulated signal, can not realize linear amplification to radiofrequency signal, can cause part main signal not reach maximum power, produce serious distortion.In order to reduce the distortion of signal, can use digital pre-distortion (Digital pre-Distortion, DPD) technology, the output signal of power amplifier is carried out to real-time sampling, the feedback signal obtaining with sampling compensates correction to main signal, and this sample circuit has formed the feedback link of radio frequency amplifying circuit.
In feedback link, the signal that is coupled out portion of energy from the radiofrequency signal of radio frequency amplifying circuit output is as sample objects, then samples by analog-digital converter (Analog to Digital Converter, ADC).In actual use, because the dynamic range of ADC is limited, after radio frequency amplifying circuit amplifies, failing to obtain linear part main signal of amplifying can not be sampled, the feedback signal that sampling obtains like this can not accurately reflect radio frequency output situation, therefore can not carry out effective compensation to main signal take this feedback signal as reference.
The solution of prior art is in feedback link, use the more ADC of high dynamic range, thereby the dynamic range of raising ADC can sample the main signal that power is lower, to promote the performance of feedback link.
In the process of the realization of above-mentioned feedback link, inventor finds that in prior art, at least there are the following problems: be subject to the restriction of technical conditions, the dynamic range of ADC device is limited, and the ADC device cost of high dynamic range is too high, does not possess service condition in communication system.Therefore, how to improve the feedback circuit performance of radio frequency amplifying circuit, become the important topic of the art.
Summary of the invention
Embodiments of the invention provide a kind of feedback link and its implementation, can not rely on the performance of ADC device, realize the accurate sampling to radio frequency output signal.
A first aspect of the present invention, a kind of feedback link is provided, be applied on radio frequency amplifying circuit, described radio frequency amplifying circuit receives initial main signal, after the amplification of described radio frequency amplifying circuit is processed, output packet is containing the first output signal of main signal and spurious signal, described feedback link comprises: coupler, the first analog to digital converter ADC and digital signal processor DSP, and described feedback link also comprises: the first power regulator;
The input of described the first power regulator is connected with the output of described coupler, the input of described coupler is connected with the output of described radio frequency amplifying circuit, the input of a described ADC is connected with the output of described the first power regulator, a described output of ADC and the input of described DSP are connected, and the output of described DSP is connected with the input of described radio frequency amplifying circuit;
Described coupler for receiving the first output signal of described radio frequency amplifying circuit, obtains the second output signal according to the coupling ratio of configuration in advance, and exports to described the first power regulator from described the first output signal;
Described the first power regulator, for receiving the second output signal of described coupler output, calculate the first power regulation factor according to the average power of described main signal, adopt described the first power regulation factor to adjust the power of described the second output signal, and the second output signal after adjusting is outputed to a described ADC;
A described ADC, for receiving the second output signal after described adjustment, and is converted to digital signal by the second output signal after described adjustment and outputs to described DSP;
Described DSP, for receiving the digital signal of a described ADC output, and calculate compensating signal according to described digital signal, described compensating signal is sent to described radio frequency amplifying circuit, to make described radio frequency amplifying circuit carry out power back-off according to described compensating signal to described initial main signal.
In conjunction with first aspect, in a kind of possible implementation, described feedback link also comprises: the second power regulator, the 2nd ADC and band stop filter;
The input of described band stop filter is connected with the output of described coupler, the input of described the second power regulator is connected with the output of described band stop filter, the output of described the second power regulator is connected with the input of described the 2nd ADC, and described the 2nd output of ADC and the input of described DSP are connected;
Described band stop filter, for obtaining the second output signal of described coupler, and from described the second output signal main signal described in filtering, obtain spurious signal;
Described the second power regulator, be used for receiving described spurious signal, and according to power calculation second power regulation factor of described spurious signal, adopt described second to adjust the power of spurious signal described in coefficient adjustment, and the spurious signal after adjusting is outputed to described the 2nd ADC;
Described the 2nd ADC, for receiving the spurious signal after adjustment, and is converted to digital spur signal by the spurious signal after described adjustment, and described digital spur signal is exported to described DSP;
Described DSP, also for receiving the digital spur signal of described the 2nd ADC output, the digital spur signal of the digital signal of a described ADC output and described the 2nd ADC output is merged into digital feedback signal, calculate compensating signal according to described digital feedback signal, described compensating signal is sent to described radio frequency amplifying circuit, to make described radio frequency amplifying circuit carry out power back-off according to described compensating signal to described initial main signal.
In conjunction with first aspect and above-mentioned possible implementation, in the possible implementation of another kind, described the first power regulator specifically for:
The ratio of the average power of the main signal of the expection average power of main signal and the output of described radio frequency amplifying circuit is taken the logarithm, the minimum multiplication factor of the result obtaining after taking the logarithm and described the first power regulator is added, obtain the first power regulation factor of described the first power regulator, adopt described the first power regulation factor to adjust the power of described the second output signal, and the second output signal after adjusting is outputed to a described ADC.
In conjunction with first aspect and above-mentioned possible implementation, in the possible implementation of another kind, described the second power regulator specifically for:
The ratio that the 2nd ADC is reached to the power of the spurious signal of the required input signal power of optimum signal-noise ratio and the output of described band stop filter is taken the logarithm, obtain the second power regulation factor of described the second power regulator, adopt described second to adjust the power of spurious signal described in coefficient adjustment, and the spurious signal after adjusting is outputed to described the 2nd ADC.
In conjunction with first aspect and above-mentioned possible implementation, in the possible implementation of another kind, described the first power regulator and the second power regulator comprise: low noise amplifier or adjustable attenuator.
A second aspect of the present invention, a kind of feedback link implementation method is provided, is applied on radio frequency amplifying circuit, described radio frequency amplifying circuit receives initial main signal, after the amplification of described radio frequency amplifying circuit is processed, output packet, containing the first output signal of main signal and spurious signal, comprising:
Receive the first output signal of described radio frequency amplifying circuit, from described the first output signal, obtain the second output signal according to the coupling ratio of configuration in advance;
Calculate the first power regulation factor according to the average power of described main signal, adopt described the first power regulation factor to adjust the power of described the second output signal;
The second output signal after described adjustment is converted to digital signal;
Calculate compensating signal according to described digital signal, described compensating signal is sent to described radio frequency amplifying circuit, to make described radio frequency amplifying circuit carry out power back-off according to described compensating signal to described initial main signal.
In conjunction with second aspect, in a kind of possible implementation, described method also comprises:
From described the second output signal, main signal described in filtering, obtains spurious signal;
According to power calculation second power regulation factor of described spurious signal, adopt the described second power of adjusting spurious signal described in coefficient adjustment;
Spurious signal after described adjustment is converted to digital spur signal;
Described digital signal and digital spur signal are merged into digital feedback signal, calculate compensating signal according to described digital feedback signal, described compensating signal is sent to described radio frequency amplifying circuit, to make described radio frequency amplifying circuit carry out power back-off according to described compensating signal to described initial main signal.
In conjunction with second aspect and above-mentioned possible implementation, in the possible implementation of another kind, the described average power according to described main signal is calculated the first power regulation factor, is specially:
The ratio of the average power of the main signal of the expection average power of main signal and the output of described radio frequency amplifying circuit is taken the logarithm, the minimum multiplication factor of the result obtaining after taking the logarithm and selected power regulator is added, obtains described the first power regulation factor.
In conjunction with second aspect and above-mentioned possible implementation, in the possible implementation of another kind, described according to power calculation second power regulation factor of described spurious signal, be specially:
The ratio that selected ADC is reached to the power of the required input signal power of optimum signal-noise ratio and described spurious signal is taken the logarithm, and obtains the second power regulation factor.
In conjunction with second aspect and above-mentioned possible implementation, in the possible implementation of another kind, described power regulator comprises: low noise amplifier or adjustable attenuator.
The embodiment of the present invention provides a kind of feedback link and its implementation, on feedback link, increase by the first power regulator, this first power regulator calculates the first power regulation factor according to the average power of main signal, and adjust the power of the second output signal according to the first power regulation factor, the second output signal after adjusting is inputed to an ADC samples, then calculate compensating signal by DSP, to make radio frequency amplifying circuit carry out power back-off according to compensating signal to initial main signal, in prior art, directly the second output signal being inputed to an ADC samples, and calculate compensating signal by DSP and compare, will be due to the restriction of ADC device dynamic scope, and part main signal that can not be collected also can be gathered after the adjustment of the first power regulator, making that the sampling of radio frequency output signal is not relied on to ADC device performance also can accurately sample, and calculate compensating signal comparatively accurately by the processing of DSP initial main signal is compensated, the final initial main signal that obtains linear amplification after the amplification of radio frequency amplifying circuit.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
A kind of feedback link structural representation that Fig. 1 provides for the embodiment of the present invention 1;
A kind of feedback link structural representation that Fig. 2 provides for the embodiment of the present invention 2;
A kind of feedback link implementation method composition schematic diagram that Fig. 3 provides for the embodiment of the present invention 3;
The another kind of feedback link implementation method composition schematic diagram that Fig. 4 provides for the embodiment of the present invention 3.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1
The embodiment of the present invention provides a kind of feedback link, be applied on radio frequency amplifying circuit, described radio frequency amplifying circuit receives initial main signal, after the amplification of described radio frequency amplifying circuit is processed, output packet is containing the first output signal of main signal and spurious signal, as shown in Figure 1, this feedback link can comprise: coupler 11, the first power regulator 12, an ADC13 and digital signal processor (Digital Signal Processor, DSP) 14.
The input of described coupler 11 is connected with the output of described radio frequency amplifying circuit, for receiving the first output signal of described radio frequency amplifying circuit, from described the first output signal, obtain the second output signal according to the coupling ratio of configuration in advance, and export to described the first power regulator 12.
Wherein, because radio frequency amplifying circuit is generally operational in inelastic region, so initial main signal is by after the amplification of radio frequency amplifying circuit, the first output signal obtaining there will be serious distortion, in order to reduce distortion, can use DPD technology, the first output signal after amplifying be carried out to real-time sampling, and proofread and correct.Therefore, can from the first output signal, obtain with coupler 11 the second output signal of Partial Power, so that calculate compensating signal according to the second output signal, and according to compensating signal, initial main signal is compensated, the distortion of described the first output signal can be reduced like this.The coupling ratio of described coupler 11 is to be configured in advance in coupler 11, and the circular of this coupling ratio is:
Wherein, k
1for the coupling ratio of coupler 11, k
2be the minimum multiplication factor of the first power amplifier, W
1for the expection average power of main signal, W
2it is the maximum power that an ADC13 reaches the required input signal of optimum signal-noise ratio.
The input of described the first power regulator 12 is connected with the output of described coupler 11, for receiving the second output signal that described coupler 11 is exported, calculate the first power regulation factor according to the average power of described main signal, adopt described the first power regulation factor to adjust the power of described the second output signal, and the second output signal after adjusting is outputed to a described ADC13.
Wherein, in the prior art, that the second power output directly coupler 11 being got inputs to an ADC13, but because the dynamic range of an ADC13 is limited, after entering over-sampling, the signal that makes to input to an ADC13 can not obtain digital signal accurately, in order to solve problems of the prior art, the second output signal that the embodiment of the present invention gets coupler 11 first inputs to the first power regulator 12 and adjusts, again the second output signal after adjusting is outputed to a described ADC13, can improve like this accuracy of the digital signal obtaining after sampling.
The circular of described the first power regulation factor is:
Wherein, k
3be the first power regulation factor, k
1for the coupling ratio of coupler 11, W
xfor the average power of the main signal of radio frequency amplifying circuit output, W
1for the expection average power of main signal.
The input of a described ADC13 is connected with the output of described the first power regulator 12, for receiving the second output signal after adjustment, and the second output signal after described adjustment is converted to digital signal outputs to described DSP14.
Wherein, in order better to calculate compensating signal, adopt digital signal to process the second output signal, so an ADC13 carries out analog-to-digital conversion by modulus conversion technique to the second output signal, obtain digitized the second output signal.
The input of described DSP14 is connected with the output of a described ADC13, for receiving the digital signal of a described ADC13 output, and calculate compensating signal according to described digital signal, described compensating signal is sent to described radio frequency amplifying circuit, to make described radio frequency amplifying circuit carry out power back-off according to described compensating signal to described initial main signal.
Wherein, in order to facilitate those skilled in the art's understanding, the initial main signal of establishing input radio frequency amplifying circuit is X, the first output signal is Y, due to the reasons such as non-linear that exist of radio frequency amplifying circuit, so Y=NKX, wherein, N is multiplication factor, and K is non linear coefficient.And the object of radio frequency amplifying circuit design is that to make output signal be that the linearity of input signal is amplified, so need to convert input signal, initial main signal is compensated, the initial main signal after order compensates is X
1=K
-1x, so Y=NKX
1→ Y=NK (K
-1x) → Y=NX, so just can obtain linear initial main signal of amplifying.
The effect of described DSP14 is to calculate compensating signal, i.e. calculating K
-1, and radio frequency amplifying circuit can be according to K
-1initial main signal is compensated, the initial main signal after compensation is amplified, just can obtain linear initial main signal of amplifying.
The concrete computational process of compensating signal is:
The second output signal that the digital signal that DSP14 sends according to an ADC13 calculates is:
Wherein, Y
aDC1for the second output signal that DSP14 calculates, X
2be the signal after an ADC13 sampling, W
2be the maximum power that an ADC13 reaches the required input signal of optimum signal-noise ratio, N
1be the bit wide of an ADC13, k
1for the coupling ratio of coupler 11, k
3it is the first power regulation factor.
Known Y=NKX, and X, N are all known, can obtain K
-1=NXY
-1, i.e. K
-1=NXY
aDC1 -1, will calculate the Y of gained
aDC1substitution formula K
-1=NXY
aDC1 -1can be regarded as to obtain compensating signal K
-1.
DSP14 is by the compensating signal K calculating
-1input to radio frequency amplifying circuit, radio frequency amplifying circuit can compensate initial main signal, and the initial main signal after compensation is K
-1x, then uses radio frequency amplifying circuit to amplify the initial main signal after compensating, and so just can obtain the initial main signal of linear amplification.
The embodiment of the present invention provides a kind of feedback link, on feedback link, increase by the first power regulator, this first power regulator calculates the first power regulation factor according to the average power of main signal, and adjust the power of the second output signal according to the first power regulation factor, the second output signal after adjusting is inputed to an ADC samples, then calculate compensating signal by DSP, to make radio frequency amplifying circuit carry out power back-off according to compensating signal to initial main signal, in prior art, directly the second output signal being inputed to an ADC samples, and calculate compensating signal by DSP and compare, will be due to the restriction of ADC device dynamic scope, and part main signal that can not be collected also can be gathered after the adjustment of the first power regulator, making that the sampling of radio frequency output signal is not relied on to ADC device performance also can accurately sample, and calculate compensating signal comparatively accurately by the processing of DSP initial main signal is compensated, the final initial main signal that obtains linear amplification after the amplification of radio frequency amplifying circuit.
Embodiment 2
The embodiment of the present invention provides a kind of feedback link, be applied on radio frequency amplifying circuit, described radio frequency amplifying circuit receives initial main signal, after the amplification of described radio frequency amplifying circuit is processed, output packet is containing the first output signal of main signal and spurious signal, as shown in Figure 2, this feedback link can comprise: coupler 21, the first power regulator 22, ADC23 and a DSP24.
The input of described coupler 21 is connected with the output of described radio frequency amplifying circuit, for receiving the first output signal of described radio frequency amplifying circuit, from described the first output signal, obtain the second output signal according to the coupling ratio of configuration in advance, and export to described the first power regulator 22.
The input of described the first power regulator 22 is connected with the output of described coupler 21, for receiving the second output signal that described coupler 21 is exported, calculate the first power regulation factor according to the average power of described main signal, adopt described the first power regulation factor to adjust the power of described the second output signal, and the second output signal after adjusting is outputed to a described ADC23.
The input of a described ADC23 is connected with the output of described the first power regulator 22, for receiving the second output signal after described adjustment, and the second output signal after described adjustment is converted to digital signal outputs to described DSP24.
Further alternative, because the resolution that ADC can provide is limited, in the time that main signal energy occupies larger ratio, low-energy spurious signal outside main signal just can not be by reliable samples, therefore the embodiment of the present invention adopts two-way ADC to sample, the one ADC23 sampling main signal and the higher spurious signal of energy, the 2nd ADC27 only samples and filters the spurious signal of the amplification after main signal through band stop filter 25, and this feedback link can also comprise: band stop filter 25, the second power regulator 26 and the 2nd ADC27.
The input of described band stop filter 25 is connected with the output of described coupler 21, for obtaining the second output signal of described coupler 21, and from described the second output signal main signal described in filtering, obtain spurious signal.
Wherein, the main signal in the second output signal receiving is carried out filtering by band stop filter 25, obtains spurious signal, and spurious signal is exported to the second power regulator 26.
The input of described the second power regulator 26 is connected with the output of described band stop filter 25, be used for receiving described spurious signal, and according to power calculation second power regulation factor of described spurious signal, adopt described second to adjust the power of spurious signal described in coefficient adjustment, and the spurious signal after adjusting is outputed to described the 2nd ADC27.
Wherein, the circular of described the second power regulation factor is:
Wherein, k
4be the second power regulation factor, W
3be that the 2nd ADC27 reaches the required input signal power of optimum signal-noise ratio, W
4for the power through band stop filter 25 filtered spurious signals.
The input of described the 2nd ADC27 is connected with the output of the second power regulator 26, for receiving the spurious signal after adjustment, and the spurious signal after described adjustment is converted to digital spur signal outputs to described DSP24.
The input of described DSP24 is connected with the 2nd ADC27 output with an ADC23, for receiving the digital signal of a described ADC23 output and the digital spur signal of described the 2nd ADC27 output, the digital spur signal of the digital signal of a described ADC23 output and described the 2nd ADC27 output is merged into digital feedback signal, calculate compensating signal according to described digital feedback signal, described compensating signal is sent to described radio frequency amplifying circuit, to make described radio frequency amplifying circuit carry out power back-off according to described compensating signal to described initial main signal.
Wherein, the concrete computational process of compensating signal is:
If the signal after an ADC23 sampling is X
2, the signal after the 2nd ADC27 sampling is X
3, an ADC23 minimum resolution signal sampling value is 1.Band stop filter 25 passband gains are k
5.If an ADC23, the 2nd ADC27 sampling bit wide are respectively N
1, N
2.
An ADC23 minimum resolution signal sampling value that is mapped to the 2nd ADC27 input is:
Wherein, int represents to round, W
2be the maximum power that an ADC23 reaches the required input signal of optimum signal-noise ratio, W
3be that the 2nd ADC27 reaches the required input signal power of optimum signal-noise ratio, k
3be the first power regulation factor, k
4it is the second power regulation factor.
The useful signal after the 2nd ADC27 sampling is (can the higher spurious signal of sampled energy due to an ADC, therefore need from the 2nd ADC27, remove the part that an ADC23 has sampled):
X
6＝X
3modX
5
Wherein, mod is complementation.
The second output signal that the digital spur calculated signals that DSP24 sends according to the 2nd ADC27 goes out is:
The second output signal that DSP24 goes out according to the digital spur calculated signals of the digital signal of an ADC23 output and the 2nd ADC27 output is:
Y＝Y
ADC1+Y
ADC2
Therefore DSP24 can be according to the Y substitution formula K calculating
-1=NXY
-1in, calculate compensating signal K
-1.According to compensating signal, initial input signal is compensated again, make the initial main signal after compensation obtain linear initial main signal of amplifying through radio frequency amplifying circuit.
It should be noted that, the first power regulator in the embodiment of the present invention and the second power regulator can be low noise amplifier or adjustable attenuator etc.
It should be noted that, the coupling ratio of coupler 21 in the embodiment of the present invention, the first power regulation factor are identical with the specific formula for calculation in embodiment mono-, and the embodiment of the present invention is not described in detail at this.
The embodiment of the present invention provides a kind of feedback link and its implementation, on feedback link, increase by the first power regulator, this first power regulator calculates the first power regulation factor according to the average power of main signal, and adjust the power of the second output signal according to the first power regulation factor, the second output signal after adjusting is inputed to an ADC samples, then calculate compensating signal by DSP, to make radio frequency amplifying circuit carry out power back-off according to compensating signal to initial main signal, in prior art, directly the second output signal being inputed to an ADC samples, and calculate compensating signal by DSP and compare, will be due to the restriction of ADC device dynamic scope, and part main signal that can not be collected also can be gathered after the adjustment of the first power regulator, making that the sampling of radio frequency output signal is not relied on to ADC device performance also can accurately sample, and calculate compensating signal comparatively accurately by the processing of DSP initial main signal is compensated, the final initial main signal that obtains linear amplification after the amplification of radio frequency amplifying circuit.
And, use two-way ADC sampling, the second tunnel is carried out filtering by main signal by band pass filter, make the resolution that can provide due to ADC limited, in the time that main signal energy occupies larger ratio, can not can be sampled by the 2nd ADC by the low-yield spurious signal of reliable samples, further improve the accuracy of sampling.
Embodiment 3
The embodiment of the present invention provides a kind of feedback link implementation method, as shown in Figure 3, comprising:
301, receive the first output signal of described radio frequency amplifying circuit, from described the first output signal, obtain the second output signal according to the coupling ratio of configuration in advance.
302, calculate the first power regulation factor according to the average power of described main signal, adopt described the first power regulation factor to adjust the power of described the second output signal.
Wherein, the described average power according to described main signal is calculated the first power regulation factor, be specially: the ratio of the average power of the main signal of the expection average power of main signal and the output of described radio frequency amplifying circuit is taken the logarithm, the minimum multiplication factor of the result obtaining after taking the logarithm and selected power regulator is added, obtains described the first power regulation factor.
303, the second output signal after described adjustment is converted to digital signal.
304, calculate compensating signal according to described digital signal, described compensating signal is sent to described radio frequency amplifying circuit, to make described radio frequency amplifying circuit carry out power back-off according to described compensating signal to described initial main signal.
Further, as shown in Figure 4, the method can also comprise:
305, main signal described in filtering from described the second output signal, obtains spurious signal.
306,, according to power calculation second power regulation factor of described spurious signal, adopt the described second power of adjusting spurious signal described in coefficient adjustment.
Wherein, according to power calculation second power regulation factor of described spurious signal, be specially: the ratio that selected ADC is reached to the power of the required input signal power of optimum signal-noise ratio and described spurious signal is taken the logarithm, and obtains the second power regulation factor.
307, the spurious signal after described adjustment is converted to digital spur signal.
Step 304 can replace with following steps 308:
308, described digital signal and digital spur signal are merged into digital feedback signal, calculate compensating signal according to described digital feedback signal, described compensating signal is sent to described radio frequency amplifying circuit, to make described radio frequency amplifying circuit carry out power back-off according to described compensating signal to described initial main signal.
It should be noted that, in the embodiment of the present invention circular of parameter can reference example 1 and embodiment 2 in the circular of corresponding parameter, the embodiment of the present invention is not described in detail at this.
The embodiment of the present invention provides a kind of feedback link implementation method, calculate the first power regulation factor according to the average power of main signal, adopt described the first power regulation factor to adjust the power of described the second output signal, and the second output signal after described adjustment is converted to digital signal, then calculate compensating signal according to described digital signal, compensating signal is sent to radio frequency amplifying circuit, to make radio frequency amplifying circuit carry out power back-off according to compensating signal to initial main signal, in prior art, directly the second output signal is sampled, and calculate compensating signal and compare, will be due to the restriction of ADC device dynamic scope, and part main signal that can not be collected also can be gathered after the adjustment of the first power regulator, making that the sampling of radio frequency output signal is not relied on to ADC device performance also can accurately sample, and calculate compensating signal comparatively accurately initial main signal is compensated, the final initial main signal that obtains linear amplification after the amplification of radio frequency amplifying circuit.
And, use two-way ADC sampling, the second tunnel is carried out filtering by main signal by band pass filter, make the resolution that can provide due to ADC limited, in the time that main signal energy occupies larger ratio, can not can be sampled by the 2nd ADC by the low-yield spurious signal of reliable samples, further improve the accuracy of sampling.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add essential common hardware by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium can read, as the floppy disk of computer, hard disk or CD etc., comprise that some instructions are in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) carry out the method described in each embodiment of the present invention.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (10)
1. a feedback link, be applied on radio frequency amplifying circuit, described radio frequency amplifying circuit receives initial main signal, after the amplification of described radio frequency amplifying circuit is processed, output packet is containing the first output signal of main signal and spurious signal, described feedback link comprises: coupler, the first analog to digital converter ADC and digital signal processor DSP, it is characterized in that, described feedback link also comprises: the first power regulator;
The input of described the first power regulator is connected with the output of described coupler, the input of described coupler is connected with the output of described radio frequency amplifying circuit, the input of a described ADC is connected with the output of described the first power regulator, a described output of ADC and the input of described DSP are connected, and the output of described DSP is connected with the input of described radio frequency amplifying circuit;
Described coupler for receiving the first output signal of described radio frequency amplifying circuit, obtains the second output signal according to the coupling ratio of configuration in advance, and exports to described the first power regulator from described the first output signal;
Described the first power regulator, for receiving the second output signal of described coupler output, calculate the first power regulation factor according to the average power of described main signal, adopt described the first power regulation factor to adjust the power of described the second output signal, and the second output signal after adjusting is outputed to a described ADC;
A described ADC, for receiving the second output signal after described adjustment, and is converted to digital signal by the second output signal after described adjustment and outputs to described DSP;
Described DSP, for receiving the digital signal of a described ADC output, and calculate compensating signal according to described digital signal, described compensating signal is sent to described radio frequency amplifying circuit, to make described radio frequency amplifying circuit carry out power back-off according to described compensating signal to described initial main signal.
2. feedback link according to claim 1, is characterized in that, described feedback link also comprises: the second power regulator, the 2nd ADC and band stop filter;
The input of described band stop filter is connected with the output of described coupler, the input of described the second power regulator is connected with the output of described band stop filter, the output of described the second power regulator is connected with the input of described the 2nd ADC, and described the 2nd output of ADC and the input of described DSP are connected;
Described band stop filter, for obtaining the second output signal of described coupler, and from described the second output signal main signal described in filtering, obtain spurious signal;
Described the second power regulator, be used for receiving described spurious signal, and according to power calculation second power regulation factor of described spurious signal, adopt described second to adjust the power of spurious signal described in coefficient adjustment, and the spurious signal after adjusting is outputed to described the 2nd ADC;
Described the 2nd ADC, for receiving the spurious signal after adjustment, and is converted to digital spur signal by the spurious signal after described adjustment and outputs to described DSP;
Described DSP, also for receiving the digital spur signal of described the 2nd ADC output, the digital spur signal of the digital signal of a described ADC output and described the 2nd ADC output is merged into digital feedback signal, calculate compensating signal according to described digital feedback signal, described compensating signal is sent to described radio frequency amplifying circuit, to make described radio frequency amplifying circuit carry out power back-off according to described compensating signal to described initial main signal.
3. feedback link according to claim 1, is characterized in that, described the first power regulator specifically for:
The ratio of the average power of the main signal of the expection average power of main signal and the output of described radio frequency amplifying circuit is taken the logarithm, the minimum multiplication factor of the result obtaining after taking the logarithm and described the first power regulator is added, obtain the first power regulation factor of described the first power regulator, adopt described the first power regulation factor to adjust the power of described the second output signal, and the second output signal after adjusting is outputed to a described ADC.
4. feedback link according to claim 2, is characterized in that, described the second power regulator specifically for:
The ratio that the 2nd ADC is reached to the power of the spurious signal of the required input signal power of optimum signal-noise ratio and the output of described band stop filter is taken the logarithm, obtain the second power regulation factor of described the second power regulator, adopt described second to adjust the power of spurious signal described in coefficient adjustment, and the spurious signal after adjusting is outputed to described the 2nd ADC.
5. according to the feedback link described in any one in claim 1-4, it is characterized in that, described the first power regulator and the second power regulator comprise: low noise amplifier or adjustable attenuator.
6. a feedback link implementation method, be applied on radio frequency amplifying circuit, described radio frequency amplifying circuit receives initial main signal, and after the amplification of described radio frequency amplifying circuit is processed, output packet is containing the first output signal of main signal and spurious signal, it is characterized in that, comprising:
Receive the first output signal of described radio frequency amplifying circuit, from described the first output signal, obtain the second output signal according to the coupling ratio of configuration in advance;
Calculate the first power regulation factor according to the average power of described main signal, adopt described the first power regulation factor to adjust the power of described the second output signal;
The second output signal after described adjustment is converted to digital signal;
Calculate compensating signal according to described digital signal, described compensating signal is sent to described radio frequency amplifying circuit, to make described radio frequency amplifying circuit carry out power back-off according to described compensating signal to described initial main signal.
7. feedback link implementation method according to claim 6, is characterized in that, described method also comprises:
From described the second output signal, main signal described in filtering, obtains spurious signal;
According to power calculation second power regulation factor of described spurious signal, adopt the described second power of adjusting spurious signal described in coefficient adjustment;
Spurious signal after described adjustment is converted to digital spur signal;
Described digital signal and digital spur signal are merged into digital feedback signal, calculate compensating signal according to described digital feedback signal, described compensating signal is sent to described radio frequency amplifying circuit, to make described radio frequency amplifying circuit carry out power back-off according to described compensating signal to described initial main signal.
8. feedback link implementation method according to claim 6, is characterized in that, the described average power according to described main signal is calculated the first power regulation factor, is specially:
The ratio of the average power of the main signal of the expection average power of main signal and the output of described radio frequency amplifying circuit is taken the logarithm, the minimum multiplication factor of the result obtaining after taking the logarithm and selected power regulator is added, obtains described the first power regulation factor.
9. feedback link implementation method according to claim 6, is characterized in that, described according to power calculation second power regulation factor of described spurious signal, is specially:
The ratio that selected ADC is reached to the power of the required input signal power of optimum signal-noise ratio and described spurious signal is taken the logarithm, and obtains the second power regulation factor.
10. feedback link implementation method according to claim 8, is characterized in that, described power regulator comprises: low noise amplifier or adjustable attenuator.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210410104.0A CN103780206A (en) | 2012-10-24 | 2012-10-24 | Feedback link and implementation method thereof |
| PCT/CN2013/085194 WO2014063577A1 (en) | 2012-10-24 | 2013-10-14 | Feedback link and method for implementing same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210410104.0A CN103780206A (en) | 2012-10-24 | 2012-10-24 | Feedback link and implementation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101527544A (en) * | 2008-03-05 | 2009-09-09 | 富士通株式会社 | Device and method for identifying inverse characteristic of nonlinear system, power amplifier and predistorter thereof |
| CN102163956A (en) * | 2010-02-24 | 2011-08-24 | 富士通株式会社 | Signal feedback loop and method for predistorter, power amplification equipment |
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| US7342445B2 (en) * | 2006-05-30 | 2008-03-11 | Motorola, Inc. | Radio frequency power amplifier circuit and method |
| WO2010073941A1 (en) * | 2008-12-25 | 2010-07-01 | 日本電気株式会社 | Power amplication device |
| CN101741317B (en) * | 2009-11-26 | 2011-12-28 | 北京北方烽火科技有限公司 | Digital predistortion linear broadband radio-frequency power amplifier device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101527544A (en) * | 2008-03-05 | 2009-09-09 | 富士通株式会社 | Device and method for identifying inverse characteristic of nonlinear system, power amplifier and predistorter thereof |
| CN102163956A (en) * | 2010-02-24 | 2011-08-24 | 富士通株式会社 | Signal feedback loop and method for predistorter, power amplification equipment |
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