CN1521971A - Frequency detection apparatus and method for linear power amplifier in WCDMA system - Google Patents
Frequency detection apparatus and method for linear power amplifier in WCDMA system Download PDFInfo
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- CN1521971A CN1521971A CNA031152406A CN03115240A CN1521971A CN 1521971 A CN1521971 A CN 1521971A CN A031152406 A CNA031152406 A CN A031152406A CN 03115240 A CN03115240 A CN 03115240A CN 1521971 A CN1521971 A CN 1521971A
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Abstract
A frequency checking apparatus and method for linear power amplifier in a broad band code division multiple access system, the frequency checking apparatus comprises an a frequency mixer, a first intermediate frequency filter, an intermediate frequency amplifier, a second intermediate frequency filter, a wave detector, a phase-locking local oscillator, an A/D converter and a control module. The invention also discloses the frequency checking method thereof.
Description
Technical field
The present invention relates to the frequency detecting technology of mobile communication system, relate in particular to a kind of frequency detecting device and method of broadband CDMA system neutral line power amplifier.
Background technology
The frequency detecting technology is widely used in the every field, particularly wireless communication field.
In the linear power amplifier, particularly feedforward linear power amplifier in Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, the demand of frequency detecting is arranged all.The detection of intermodulation signal, the setting of pilot signal all needs to know in advance the spectrum distribution of input signal.If there is not frequency detecting device, the frequency distribution of input signal must be by system's announcement or manual the setting, and this has limited the module independence and the versatility of linear power amplifier, so be necessary to increase frequency detecting device in linear power amplifier.
Existing frequency detecting technology can be divided into two types: the frequency detecting of counter and sweep-frequency B frequency detecting;
The frequency detecting of counter draws frequency by measuring the pulse number that passes through in certain time slot.The counter frequency detecting is widely used in the frequency measurement of CW frequency measurement or narrowband modulation carrier wave, and many frequency meters adopt this method to carry out frequency detecting.But the limitation of this counter frequency measurement is the frequency spectrum detection that is not suitable for broadband signal.
The sweep-frequency B frequency detecting makes it to scan by resolution bandwidth by the local frequency that changes receiver, scans the result of output then according to receiver at every turn, determines spectrum distribution.Only need resolution bandwidth enough little in theory, can realize that accurate frequency or spectrum distribution detect.Spectrum analyzer just is based on the frequency sweep frequency detecting and measures frequency spectrum.General frequency sweep frequency detecting device (such as spectrum analyzer), though can reach the purpose of frequency detecting, more complicated on its hardware, speed is slow, and cost is not suitable for using in linear power amplifier than higher.
Summary of the invention
At existing the counter frequency detecting to be not suitable for the frequency spectrum detection of broadband signal in the existing frequency detecting technology, general sweep-frequency B frequency detecting hardware complexity, speed is slow, the shortcoming that cost is high the purpose of this invention is to provide a kind of sweep-frequency B frequency detecting device of the special use that designs according to the spectrum distribution characteristics of Wideband Code Division Multiple Access (WCDMA) (WCDMA).Make WCDMA multicarrier linear power amplifier have spectrum detection function, strengthen its versatility and independence, for the pilot tone setting or directly intermodulation detect the frequency location foundation be provided.
In order to reach above purpose, the present invention adopts following technical scheme,
The frequency detecting device of the Linear Power Amplifier in the broadband CDMA system of the present invention comprises:
Frequency mixer, first intermediate-frequency filter, intermediate frequency amplifier, second intermediate-frequency filter, wave detector, phase-locked local oscillator and A/D converter,
Described frequency mixer carries out mixing with Wideband Code Division Multiple Access (WCDMA) (WCDMA) signal of incoming frequency checkout gear and local oscillation signal from described phase-locked local oscillator, outputs to described first intermediate-frequency filter after radiofrequency signal is changed to fixed intermediate frequency;
Described first intermediate-frequency filter carries out filtering to the output signal of described frequency mixer, outputs to described intermediate frequency amplifier behind the filtering out of band components;
Described intermediate frequency amplifier outputs to second intermediate-frequency filter after the output signal of the described first medium frequency ripple device being amplified to a level value in the dynamic range of described wave detector;
The described second medium frequency ripple device carries out filtering and outputs to described wave detector the output of described intermediate frequency amplifier;
Described wave detector detects the reflection variable power from the output signal of described second intermediate-frequency filter low-frequency analog signal outputs to described A/D converter;
Described A/D converter converts the output signal of described wave detector to digital signal;
This frequency detecting device comprises that also the input signal of the described control module of control module is the digital output signal of described A/D converter, and described control module is provided with the frequency of described phase-locked local oscillator.
The frequency detecting method of Wideband Code Division Multiple Access (WCDMA) Linear Power Amplifier of the present invention as shown in Figure 2, comprising:
A. coarse scan, beginning with 3.8MHz from the low side frequency is at interval, scans, up to detecting first high level, writing down this frequency is frequency 1, enters step b; A is exactly the coarse scan process to B among Fig. 2;
B. essence is swept, and along the frequency of detected first high level among the step a: frequency 1 is to do intensive scanning at interval with 100KHz to low side, and up to low level occurring, writing down this frequency is frequency 2, stops to scan to low side; Then from frequency 1 position to high-end be at interval to do intensive scanning with 100KHz, up to low level occurring, writing down this frequency is frequency 3, calculates the centre frequency of lowest operating frequency carrier wave: frequency 4=(frequency 2+ frequency 3)/2; Enter step c; B is exactly smart inswept journey to C among Fig. 2;
C. jump scanning, along the frequency 4 that obtains among the step b, beginning is at interval with 5MHz, scans to high-end, if scanning output high level, then noting this frequency is frequency 5, frequency 6 ..., till the carrier wave frequency range that exceeds Wideband Code Division Multiple Access (WCDMA) is high-end; C is exactly the jump scanning process to D among Fig. 2.
Described coarse scan, essence are swept with jump scanning and are all comprised a plurality of single sweep operations, and a single sweep operation comprises following step:
1) frequency is put number;
2) wait for, because the hardware of frequency detecting device has a transient process, could reading of data after stable so must wait hardware state to recover, in the transient state time-continuing process, need wait;
3) read the A/D data;
4) carry out electrical level judging.
It is to distribute by interval 5MHz by the carrier frequency in 200KHz WCDMA carrier occupancy spaced apart, single bandwidth 3.84MHz, the same operation that the present invention has utilized the characteristics of broadband CDMA system frequency distribution: centre carrier frequency OFFSET.Suitable detector arrangement and scan method have been designed, it is simpler and easy to make detector arrangement of the present invention have hardware, and detection speed is fast, realizes easily, the characteristics that cost is low also can satisfy the required precision of Wideband Code Division Multiple Access (WCDMA) (WCDMA) multicarrier linear power amplifier on precision.
Description of drawings
Fig. 1 is the hardware principle block diagram of frequency detecting device of the present invention.
Fig. 2 is a frequency detecting FB(flow block) of the present invention.
Fig. 3 is the control module theory diagram of frequency detecting device of the present invention.
Embodiment
The present invention is a kind of frequency detecting device and method of wide-band CDMA multiple address and carrier Linear Power Amplifier, can realize the frequency detecting of Wideband Code Division Multiple Access (WCDMA) (WCDMA) signal to input, for the spectrum distribution information that provides is provided for pilot tone setting or intermodulation.
The frequency detecting device of Wideband Code Division Multiple Access (WCDMA) Linear Power Amplifier of the present invention as shown in Figure 1, comprising:
Frequency mixer 101, first intermediate-frequency filter 102, intermediate frequency amplifier 103, second intermediate-frequency filter 104, wave detector 105, phase-locked local oscillator 106, control module 107 and A/D converter 108,
Frequency mixer 101 carries out mixing with Wideband Code Division Multiple Access (WCDMA) (WCDMA) signal of incoming frequency checkout gear and local oscillation signal from phase-locked local oscillator 106, outputs to first intermediate-frequency filter 102 after radiofrequency signal is changed to fixed intermediate frequency;
The output signal of 102 pairs of frequency mixers 101 of first intermediate-frequency filter is carried out filtering, outputs to intermediate frequency amplifier 103 behind the filtering out of band components;
Intermediate frequency amplifier 103 outputs to second intermediate-frequency filter 104 after the output signal of the first medium frequency ripple device 102 being amplified to a level value in the dynamic range of wave detector 105;
The output of 104 pairs of intermediate frequency amplifiers 103 of the second medium frequency ripple device is carried out filtering and is outputed to wave detector 105;
Wave detector 105 detects the reflection variable power from the output signal of second intermediate-frequency filter 104 low-frequency analog signal outputs to described A/D converter 108;
A/D converter 108 outputs to control module 107 after converting the output signal of wave detector 105 to digital signal;
Control module 107 changes local frequency by the frequency that phase-locked local oscillator 106 is set, and puts number if change frequency according to predetermined rule, just can realize frequency scanning.
The input signal of control module 107 is the digital output signal of A/D converter 108, and control module 107 comprises,
Data buffer A1074, CPU element 1071, communication port 1076, program storage 1072, data storage 1073, data buffer B1075 and D/A converter 1077;
The input signal of data buffer A1074 is the output signal of A/D converter 108, and the result outputs to described CPU element 1071;
Data buffer B1075 and phase-locked local oscillator 106 diconnecteds;
Because the biasing (OFFSET) of the carrier frequency of Wideband Code Division Multiple Access (WCDMA) (WCDMA) is the integral multiple of 200KHz, and be spaced apart.So, require to avoid detecting error about resolution bandwidth 100KHz for detected carrier frequency distribution exactly.Therefore, the bandwidth of described the first, the second intermediate-frequency filter should be smaller or equal to 100KHz.Because at Wideband Code Division Multiple Access (WCDMA) (WCDMA) carrier wave edge, the power spectrum signal variable density is bigger, near the carrier wave edge, can correctly to detect more weak power spectrum signal and not influenced by the high power spectrum signal of carrier wave in order to make, require resolution filtering that higher sideband suppression is arranged, Here it is adopts the cause of two-stage intermediate-frequency filter; And in force, intermediate-frequency filter generally adopts Surface Acoustic Wave Filter, suppresses with the sideband that reaches greater than 90dB.
Possessed hardware foundation, also must carry out correct software control, just can finish the purpose of frequency detecting.The software control key of this frequency detecting is exactly the frequency scanning process.If at interval with 100KHz, in the intensive scanning of full WCDMA frequency range, though detected carrier OFFSET and spectrum distribution accurately, because scanning times many (60MHz bandwidth, needs 600 times), so speed is slow.
Scan method of the present invention is the frequency distribution characteristics according to Wideband Code Division Multiple Access (WCDMA) (WCDMA), and definite scan method possesses fireballing characteristics.This method is that the following characteristics of having utilized Wideband Code Division Multiple Access (WCDMA) (WCDMA) frequency distribution: centre carrier frequency OFFSET is to distribute by interval 5MHz by the carrier frequency in 200KHz WCDMA carrier occupancy spaced apart, single bandwidth 3.84MHz, the same operation.The testing process of this method is made of a plurality of single sweep operations.A single sweep operation comprises following step:
1) frequency is put number;
2) wait for; Because the hardware of frequency detecting device has a transient process, thus must wait hardware state recover stable after the ability reading of data; In the transient state time-continuing process, need to wait for;
3) read the A/D number;
4) carry out electrical level judging.
Wideband Code Division Multiple Access (WCDMA) frequency detecting method of the present invention as shown in Figure 2, may further comprise the steps:
A. coarse scan, beginning with 3.8MHz from the low side frequency is at interval, scans, up to detecting first high level, writing down this frequency is frequency 1, stops step a, enters step b.Step a abbreviates coarse scan as, its objective is a work carrier wave that finds frequency minimum.2 position A are exactly the coarse scan process of describing to position B among the figure, specifically may further comprise the steps:
A1., initial frequency FL is set;
A2. carry out single sweep operation one time;
A3. carry out electrical level judging, for low level then continues step a4, high level then finishes coarse scan, and writing down this frequency is frequency 1;
A4. frequency increases 3.8MHz, gets back to step a2.
B. essence is swept, along detecting first high level frequency: frequency 1, doing with 100KHz to low side is intensive scanning at interval, up to low level occurring, writing down this frequency is frequency 2, stops to scan to low side; Be intensive scanning at interval from frequency 1 to high-end doing with 100KHz then, up to low level occurring, writing down this frequency is frequency 3.Calculate the centre frequency of lowest operating frequency carrier wave: frequency 4=(frequency 2+ frequency 3)/2; Calculating finishes and enters step c).Step b) abbreviates essence as and sweeps.Position B is exactly the smart inswept journey of describing to position C among Fig. 2, specifically may further comprise the steps:
B1., it is described frequency 1 that initial frequency is set;
B2. carry out single sweep operation one time;
B3. carry out electrical level judging, for high level then continues step b4, low level then continues step b5;
B4. frequency reduces 100KHz, gets back to step b2;
B5. writing down this frequency is frequency 2;
B6. resetting initial frequency is described frequency 1;
B7. carry out single sweep operation one time;
B8. carry out electrical level judging, for high level then continues step b9, low level then continues step b10;
B9. frequency increases 100KHz, gets back to step b7;
B10. writing down this frequency is frequency 3, calculates the centre frequency of lowest operating frequency carrier wave: frequency 4=(frequency 2+ frequency 3)/2; Finishing essence sweeps.
C) jump scanning, along described frequency 4, beginning is at interval with 5MHz, scans to high-end.If scanning output high level, writing down this frequency is frequency 5, and frequency 6 is till the carrier wave frequency range that exceeds Wideband Code Division Multiple Access (WCDMA) is high-end.Step c) is called for short jump scanning.Position C is exactly the jump scanning process of describing to position D among Fig. 2, specifically may further comprise the steps:
C1., it is frequency 4 that initial frequency is set;
C2. carry out single sweep operation one time;
C3. carry out electrical level judging, for low level then continues step c4, high level then continues step c5;
C4. frequency increases 5MHz, is higher than as frequency that the carrier wave frequency range of Wideband Code Division Multiple Access (WCDMA) is high-end then to finish jump scanning, otherwise gets back to step c2;
C5. write down this high level position, frequency increases 5MHz, is higher than as frequency that the carrier wave frequency range of Wideband Code Division Multiple Access (WCDMA) is high-end then to finish jump scanning, otherwise gets back to step c2.
In order to guarantee the accuracy of frequency detecting, avoid detecting error, the threshold setting of high-low level is extremely important.In this device, level threshold equals the 20dB that adds that wave detector can the linearity test minimum level.Be higher than this thresholding and then be high level, be lower than this thresholding and then be low level.
When having only a carrier wave, and the number of times that the frequency detecting of carrying out under the situation that is positioned at 2170MHz of this carrier wave need scan is maximum.Be calculated as follows:
Coarse scan: int (575/38)+1=16 (inferior)
Essence is swept: int (38.4/1)+1=39 (inferior)
Scanning times is 55 times altogether.
Compare with the intensive scanning of full frequency band, its sweep speed of this scan method has improved about 11 times.
Show that through experimental verification this device can detect the spectrum distribution of WCDMA carrier signal exactly.In specific implementation process, note following aspect:
1) for different incoming signal level scopes, the adjustment that will gain on hardware makes the signal level that is input to wave detector drop on the detection range of wave detector the best.
2), when the high-low level decision threshold is set, carry out the thresholding calibration for different incoming signal level scopes.Calibrating principle is, presses the little 5dB input carrier signal of minimum level of incoming signal level scope, allows scanning element fall in the band of carrier wave, and the level of its output is the level decision threshold.
Claims (8)
1. the frequency detecting device of a broadband CDMA system neutral line power amplifier is characterized in that, comprising:
Frequency mixer, first intermediate-frequency filter, intermediate frequency amplifier, second intermediate-frequency filter, wave detector, phase-locked local oscillator, A/D converter,
Described frequency mixer is the wide-band code division multiple access signal of incoming frequency checkout gear and local oscillation signal mixing from described phase-locked local oscillator, outputs to described first intermediate-frequency filter after radiofrequency signal is changed to fixed intermediate frequency;
Described first intermediate-frequency filter carries out filtering to the output signal of described frequency mixer, outputs to described intermediate frequency amplifier behind the filtering out of band components;
Described intermediate frequency amplifier outputs to second intermediate-frequency filter after the output signal of the described first medium frequency ripple device being amplified to a level value in the dynamic range of described wave detector;
The described second medium frequency ripple device carries out filtering and outputs to described wave detector the output of described intermediate frequency amplifier;
Described wave detector detects the reflection variable power from the output signal of described second intermediate-frequency filter low-frequency analog signal outputs to described A/D converter;
Described A/D converter converts the output signal of described wave detector to digital signal;
This device also comprises
Control module,
The input signal of described control module is the digital output signal of described A/D converter, and described control module is provided with the frequency of described phase-locked local oscillator.
2. the frequency detecting device of broadband CDMA system neutral line power amplifier as claimed in claim 1 is characterized in that, described control module comprises:
Data buffer A, CPU element, communication port, program storage, data storage, data buffer B and D/A converter;
The input signal of described data buffer A is the output signal of described A/D converter, and the result outputs to described CPU element;
Described CPU element and described communication port, described program storage, described data storage and described data buffer B diconnected, the data of described CPU element also output to described D/A converter;
Described data buffer B and described phase-locked local oscillator diconnected;
3. the frequency detecting device of broadband CDMA system neutral line power amplifier as claimed in claim 1 is characterized in that, the bandwidth of described first intermediate-frequency filter and second intermediate-frequency filter should be less than 100KHz.
4. the frequency detecting method of a broadband CDMA system neutral line power amplifier is characterized in that, may further comprise the steps,
A. carry out coarse scan, beginning with 3.8M from the low side frequency is at interval, scans, and up to detecting first high level, writing down this frequency is frequency 1, enters step b;
B. carry out essence and sweep, along the frequency of detected first high level among the step a: frequency 1 is to do intensive scanning at interval with 100KHz to low side, and up to low level occurring, writing down this frequency is frequency 2, stops to scan to low side; Then from frequency 1 position to high-end be at interval to do intensive scanning with 100KHz, up to low level occurring, writing down this frequency is frequency 3, calculates the centre frequency of lowest operating frequency carrier wave: frequency 4=(frequency 2+ frequency 3)/2; Enter step c;
C. carrying out jump scanning, is at interval with 5M along frequency 4 beginnings that obtain among the step b, scans to high-end, if scanning output high level, then noting this frequency is frequency 5, frequency 6 ... till the carrier wave frequency range that exceeds Wideband Code Division Multiple Access (WCDMA) is high-end.
5. the frequency detecting method of broadband CDMA system neutral line power amplifier as claimed in claim 4 is characterized in that, described coarse scan, and essence is swept with jump scanning and is included a plurality of single sweep operation processes, and a single sweep operation further may further comprise the steps:
1) frequency is put number;
2) wait for, in the transient state time-continuing process, wait for, wait hardware state to recover stable;
3) read the A/D data;
4) carry out electrical level judging.
6. the frequency detecting method of broadband CDMA system neutral line power amplifier as claimed in claim 4 is characterized in that, describedly carries out coarse scan and further may further comprise the steps:
A1., it is the low side frequency that initial frequency is set;
A2. frequency is put number;
A3. wait for that hardware state recovers stable;
A4. read the A/D data;
A5. carry out electrical level judging, for low level then continues step a6, high level then finishes coarse scan, and writing down this frequency is frequency 1;
A6. frequency is increased 3.8MHz, get back to step a2.
7. the frequency detecting method of broadband CDMA system neutral line power amplifier as claimed in claim 4 is characterized in that, the described essence of carrying out is swept further and be may further comprise the steps:
B1., it is described frequency 1 that initial frequency is set;
B2. frequency is put number;
B3. wait for that hardware state recovers stable;
B4. read the A/D data;
B5. carry out electrical level judging, for high level then continues step b6, low level then continues step b7;
B6. frequency reduces 100KHz, gets back to step b2;
B7. writing down this frequency is frequency 2;
B8. resetting initial frequency is described frequency 1;
B9. frequency is put number;
B10. wait for that hardware state recovers stable;
B11. read the A/D data;
B12. carry out electrical level judging, for high level then continues step b13, low level then continues step b14;
B13. frequency increases 100KHz, gets back to step b9;
B14. writing down this frequency is frequency 3, calculates the centre frequency of lowest operating frequency carrier wave: frequency 4=(frequency 2+ frequency 3)/2; Finishing essence sweeps.
8. the frequency detecting method of broadband CDMA system neutral line power amplifier as claimed in claim 4 is characterized in that, describedly carries out jump scanning and further may further comprise the steps:
C1., it is frequency 4 that initial frequency is set;
C2. frequency is put number;
C3. wait for that hardware state recovers stable;
C4. read the A/D data;
C5. carry out electrical level judging, for low level then continues step c6, high level then continues step c7;
C6. frequency increases 5MHz, is higher than as frequency that the carrier wave frequency range of Wideband Code Division Multiple Access (WCDMA) is high-end then to finish jump scanning, otherwise gets back to step c2;
C7. write down this high level position, frequency increases 5MHz, is higher than as frequency that the carrier wave frequency range of Wideband Code Division Multiple Access (WCDMA) is high-end then to finish jump scanning, otherwise gets back to step c2.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA031152406A CN1521971A (en) | 2003-01-29 | 2003-01-29 | Frequency detection apparatus and method for linear power amplifier in WCDMA system |
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| CNA031152406A CN1521971A (en) | 2003-01-29 | 2003-01-29 | Frequency detection apparatus and method for linear power amplifier in WCDMA system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102026342A (en) * | 2010-11-27 | 2011-04-20 | 华为终端有限公司 | WCDMA (wideband code division multiple access) cell search method and device |
| CN101710836B (en) * | 2009-11-11 | 2013-01-02 | 北京北方烽火科技有限公司 | Frequency sweep device and frequency sweep method |
| CN105337675A (en) * | 2015-12-10 | 2016-02-17 | 国网四川省电力公司电力科学研究院 | 470 M micropower signal power detection circuit |
-
2003
- 2003-01-29 CN CNA031152406A patent/CN1521971A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710836B (en) * | 2009-11-11 | 2013-01-02 | 北京北方烽火科技有限公司 | Frequency sweep device and frequency sweep method |
| CN102026342A (en) * | 2010-11-27 | 2011-04-20 | 华为终端有限公司 | WCDMA (wideband code division multiple access) cell search method and device |
| WO2012068853A1 (en) * | 2010-11-27 | 2012-05-31 | 华为终端有限公司 | Method and device for searching wideband code division multiple access cells |
| CN102026342B (en) * | 2010-11-27 | 2013-08-07 | 华为终端有限公司 | WCDMA (wideband code division multiple access) cell search method and device |
| CN105337675A (en) * | 2015-12-10 | 2016-02-17 | 国网四川省电力公司电力科学研究院 | 470 M micropower signal power detection circuit |
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