CN1349303A - Adaptive linear power amplifier and its adaptive method - Google Patents
Adaptive linear power amplifier and its adaptive method Download PDFInfo
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- CN1349303A CN1349303A CN 00129976 CN00129976A CN1349303A CN 1349303 A CN1349303 A CN 1349303A CN 00129976 CN00129976 CN 00129976 CN 00129976 A CN00129976 A CN 00129976A CN 1349303 A CN1349303 A CN 1349303A
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- power amplifier
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Abstract
An amplifier according to the invention proceeds frequency spectrum interrelating for pilot frequency signal pass through linear power amplify unit, the interelated amplitude error is utilized for output information, then proceeds adjustment for linear power amplify unit. The characteristics are; linear phase modulation signal is used to proceed phase modulation and frequency spread for pilot frequency signal before it is set into said power amplifier, the two pilot frequency signals are processed by rapid Fourier transformation separately before being demodulated by demodulator.
Description
The present invention relates to the linear power amplifier technology of electronic applications, relate in particular to a kind of adaptive linear power amplifier and the adaptive approach thereof that generally are applied in moving communicating field.
In moving communicating fields such as GSM, WCDMA, CDMA2000 for example, often adopt the adaptive power amplifying technique, one of existing Linear Power Amplifier adaptive technique is that pilot tone adopts unmodulated continuous wave promptly to put frequent spectrum correlation method.Fig. 1 shows the point of pilot tone employing unmodulated continuous wave in the prior art and composes correlation method again and again.Please refer to Fig. 1, pilot source produces pilot signal F1, and F1 is divided into two-way through power splitter.A road of F1 enters upconverter and local oscillator F0 up-conversion to radio frequency F2, radio frequency F2 goes into linear power amplifier unit (hereinafter to be referred as LPA) through the coupling of band pass filter and directional coupler is laggard, enter low-converter through band pass filter from LPA output again through directional coupler coupling output again, downconvert to intermediate frequency F1 with local oscillator F0, behind band pass filter, send into the coherent demodulation circuit again as coherent signal.The coherent demodulation circuit is sent into as relevant local oscillation signal in another road of F1.
The shortcoming of this kind prior art is, because pilot signal F1 is the intermediate frequency point-frequency signal, when having the co-channel interference signal, the coherent demodulation circuit can't be distinguished useful signal and interference signal, makes range error information after the coherent demodulation can not correctly reflect the amplitude information of LPA loop.Thereby reduced demodulation accuracy, the loop adaptive ability descends, and makes the LPA mis-behave, very causes to cause the Linear Power Amplifier unit can't operate as normal.In addition, though adopt the CDMA signal can improve antijamming capability, there is the higher defective of technical sophistication and cost.
The amplifier that the object of the present invention is to provide a kind of adaptive approach of adaptive linear power amplifier and use this method to realize, it can improve the antijamming capability of amplifier, thereby improves demodulation accuracy, makes the Linear Power Amplifier can steady operation.
According to an aspect of the present invention, provide a kind of adaptive approach of adaptive linear power amplifier, this adaptive linear power amplifier comprises pilot source, power splitter, linear power amplifier unit and coherent detector at least; This method comprises: by pilot source output pilot signal, deliver to power splitter separately, first via pilot signal is behind linear Power Amplifier Unit, input to a coherent detector as coherent signal and carry out coherent demodulation, the second tunnel pilot signal is as the relevant local oscillator of this coherent detector, the range error output information of this coherent detector, be used for this linear power amplifier unit is adjusted, it is characterized in that, before the pilot signal of pilot source is sent into described power splitter, adopt linear phase-modulated signal that pilot signal is carried out the phase modulation spread spectrum; And the two-way pilot signal is before entering described coherent detector demodulation, respectively through fast Fourier transform.
According to another aspect of the present invention, provide a kind of adaptive linear power amplifier, included at least: pilot source, power splitter, linear power amplifier unit, coherent detector; Wherein by pilot source output pilot signal, deliver to power splitter and be divided into two-way, first via pilot signal is behind linear Power Amplifier Unit, input to a coherent detector as coherent signal and carry out coherent demodulation, the second tunnel pilot signal is as the relevant local oscillator of this coherent detector, the range error output information of this coherent detector, be used for this linear power amplifier unit is adjusted, it is characterized in that further including: the phase modulation spread spectrum modulator, before the pilot signal of pilot source is sent into described power splitter, adopt linear phase-modulated signal that pilot signal is carried out the phase modulation spread spectrum; With two fast Fourier transform unit, before the two-way pilot signal enters described coherent detector demodulation, carry out fast Fourier transform respectively.
The present invention has not only greatly strengthened the antijamming capability of pilot signal, and can improve the coherent demodulation precision.Guarantee the stability of Linear Power Amplifier.
For making purpose technical scheme of the present invention and advantage clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.Wherein
Fig. 1 shows the point of pilot tone employing unmodulated continuous wave in the prior art and composes correlation method again and again;
Fig. 2 shows a preferred embodiment of the present invention.
The present invention can be called wide-band spread spectrum frequency spectrum correlation method again, and core of the present invention is in the pilot modulated demodulation of adaptive linear power amplifier pilot signal to be carried out linear phase modulation spread spectrum, and then utilizes the demodulation of frequency spectrum correlation method.Owing to for example adopt the wide-band spread spectrum technology variable, so reached good anti-interference from the hundreds of kilohertz to several megahertzes.
Preferably, the two-way pilot signal after mould/number conversion, entered digital signal processor more respectively and carries out fast Fourier transform respectively before entering described coherent detector demodulation.
Preferably, described linear phase-modulated signal is sawtooth waveforms or triangular wave.
Preferably, described pilot signal is an intermediate frequency, and described first via pilot signal is carried out up-conversion to radio frequency and down-conversion respectively and recovered former intermediate frequency pilot signal frequency in the front and back through Power Amplifier Unit.
Preferably, on the path of described first via pilot signal, be provided with some band pass filters in order to the filtering clutter.
Fig. 2 shows a preferred embodiment of the present invention.Please refer to Fig. 2, in the present embodiment, adopt linear phase-modulated signal that the intermediate frequency pilot source is carried out the phase modulation spread spectrum.Band spectrum modulation intermediate frequency pilot signal F1 is divided into two-way through power splitter.Merit divides back pilot tone F1 one tunnel to be converted to radio frequency F2 through up-conversion and local oscillator F0, through band pass filter, sends into Linear Power Amplifier unit (LPA) through directional coupler again.Radio frequency F2 again through directional coupler coupling output, sends into low-converter again behind band pass filter behind LPA, be converted to intermediate frequency F1 with local oscillator F0.F1 is after band-pass filter for this intermediate frequency pilot signal, through the A/D conversion, sends into coherent demodulator as coherent signal again after fast Fourier transform (FFT).Simultaneously, merit divides another road of pilot tone F1, back through the A/D conversion, sends into coherent demodulator as the coherent demodulation local vibration source again behind FFT.Through the coherent pilot signal of LPA loop and the relevant local oscillator of not passing through the LPA loop, after coherent demodulation, draw LPA loop range error information.In the present embodiment, fast Fourier transform (FFT) and coherent demodulation are finished by DSP, and linear phase-modulated signal is triangular wave or sawtooth signal.
As can be seen from Figure 2, because pilot signal F1 is the phase modulation spread-spectrum signal, its apread spectrum bandwidth can be from the hundreds of kilohertz to several megahertzes, so the interference signal that only has identical phase modulation spread spectrum could be disturbed pilot signal.Therefore, wide-band spread spectrum frequency spectrum correlation method has improved demodulation accuracy, has greatly strengthened LPA adaptive loop circuit antijamming capability, has guaranteed LPA stability.And in the present embodiment,, not only improve demodulation accuracy, and improved demodulation speed owing to adopt the DSP technology to carry out FFT and coherent demodulation.
Above embodiment is only unrestricted in order to explanation the present invention, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the present invention, and not breaking away from the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1, a kind of adaptive approach of adaptive linear power amplifier, this adaptive linear power amplifier comprise pilot source, power splitter, linear power amplifier unit and coherent detector at least; This method comprises: by pilot source output pilot signal, deliver to power splitter separately, first via pilot signal is behind linear Power Amplifier Unit, input to a coherent detector as coherent signal and carry out coherent demodulation, the second tunnel pilot signal is as the relevant local oscillator of this coherent detector, the range error output information of this coherent detector, be used for this linear power amplifier unit is adjusted, it is characterized in that, before the pilot signal of pilot source is sent into described power splitter, adopt linear phase-modulated signal that pilot signal is carried out the phase modulation spread spectrum; And the two-way pilot signal is before entering described coherent detector demodulation, respectively through fast Fourier transform.
2, the adaptive approach of linear power amplifier as claimed in claim 1, it is characterized in that, the two-way pilot signal after mould/number conversion, entered digital signal processor more respectively and carries out fast Fourier transform respectively before entering described coherent detector demodulation.
3, the adaptive approach of linear power amplifier as claimed in claim 1 is characterized in that, described linear phase-modulated signal is sawtooth waveforms or triangular wave.
4, the adaptive approach of linear power amplifier as claimed in claim 1, it is characterized in that described pilot signal is an intermediate frequency, described first via pilot signal is in the front and back through Power Amplifier Unit, carry out up-conversion to radio frequency and down-conversion respectively and recover former intermediate frequency pilot signal frequency.
5, the adaptive approach of linear power amplifier as claimed in claim 1 is characterized in that, on the path of described first via pilot signal, is provided with some band pass filters in order to the filtering clutter.
6, a kind of adaptive linear power amplifier includes at least: pilot source, power splitter, linear power amplifier unit, coherent detector; Wherein by pilot source output pilot signal, deliver to power splitter and be divided into two-way, first via pilot signal is behind linear Power Amplifier Unit, input to a coherent detector as coherent signal and carry out coherent demodulation, the second tunnel pilot signal is as the relevant local oscillator of this coherent detector, the range error output information of this coherent detector is used for this linear power amplifier unit is adjusted, and it is characterized in that further including:
The phase modulation spread spectrum modulator before the pilot signal of pilot source is sent into described power splitter, adopts linear phase-modulated signal that pilot signal is carried out the phase modulation spread spectrum; With
Two fast Fourier transform unit before the two-way pilot signal enters described coherent detector demodulation, carry out fast Fourier transform respectively.
7, a kind of adaptive linear power amplifier as claimed in claim 6, it is characterized in that, described fast Fourier transform unit is a digital signal processor, the two-way pilot signal is before entering described coherent detector demodulation, after mould/number conversion, enter digital signal processor more respectively and carry out fast Fourier transform respectively.
8, adaptive linear power amplifier as claimed in claim 6 is characterized in that, described linear phase-modulated signal is sawtooth waveforms or triangular wave.
9, adaptive linear power amplifier as claimed in claim 6, it is characterized in that described pilot signal is an intermediate frequency, described first via pilot signal is in the front and back through Power Amplifier Unit, carry out up-conversion to radio frequency and down-conversion respectively and recover former intermediate frequency pilot signal frequency.
10, adaptive linear power amplifier as claimed in claim 6 is characterized in that, on the path of described first via pilot signal, is provided with some band pass filters in order to the filtering clutter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB00129976XA CN1168202C (en) | 2000-10-17 | 2000-10-17 | Adaptive linear power amplifier and its adaptive method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB00129976XA CN1168202C (en) | 2000-10-17 | 2000-10-17 | Adaptive linear power amplifier and its adaptive method |
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| Publication Number | Publication Date |
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| CN1349303A true CN1349303A (en) | 2002-05-15 |
| CN1168202C CN1168202C (en) | 2004-09-22 |
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| CNB00129976XA Expired - Fee Related CN1168202C (en) | 2000-10-17 | 2000-10-17 | Adaptive linear power amplifier and its adaptive method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330097C (en) * | 2002-12-10 | 2007-08-01 | 中兴通讯股份有限公司 | Delaying matcher |
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- 2000-10-17 CN CNB00129976XA patent/CN1168202C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330097C (en) * | 2002-12-10 | 2007-08-01 | 中兴通讯股份有限公司 | Delaying matcher |
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| CN1168202C (en) | 2004-09-22 |
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Granted publication date: 20040922 Termination date: 20161017 |