CN101227211B - Method and apparatus for calibration of power of receiving main broadband - Google Patents
Method and apparatus for calibration of power of receiving main broadband Download PDFInfo
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- CN101227211B CN101227211B CN2007100007477A CN200710000747A CN101227211B CN 101227211 B CN101227211 B CN 101227211B CN 2007100007477 A CN2007100007477 A CN 2007100007477A CN 200710000747 A CN200710000747 A CN 200710000747A CN 101227211 B CN101227211 B CN 101227211B
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Abstract
The total broadband receiving power calibrating apparatus of the invention comprises a matching load which is connected to a duplexer, the duplexer which is used to transmit signals which are received by an antenna to a lower converter, the lower converter which is used to converse frequency of the signals and transmits the signals which are conversed frequency to a total broadband receiving power detecting unit, the total broadband receiving power detecting unit which is used to report total broadband receiving power to a controlling unit according to signal detecting total broadband receiving power, and the controlling unit which is used to obtain a compensating value through comparing total broadband receiving power and equivalent low noise and carry out calibration. Calibration accuracy of RTWP is increased through the total broadband receiving power calibrating apparatus, wherein the method can increase calibration accuracy in +-1dB, which is superior to the requirement of a 3GPP protocol, simultaneously other instruments and devices are not needed, and the operation compared with the original operation is easy to operate.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of calibration of power of receiving main broadband method and apparatus.
Background technology
3GPP agreement 25.133 requires the data feedback channel RTWP value of reporting absolute precision to be ± 4dB, and relative accuracy is ± 0.5dB.Because board for receiving and sending message separates with duplexer in the system, existing calibration steps is (as shown in Figure 1): in test station, import appropriate amplitude (like-86dBm) signal as benchmark with signal source 102 from 104 mouthfuls of duplexers (all board for receiving and sending message all are to use same duplexer); Through low-converter 106; After detecting signal amplitude by the RTWP functional unit 108 of transceiver veneer, report CPU 110, then through calculating; Draw the RTWP detected value; With the contrast of real input signal amplitude, the value of being compensated, write storage unit.
When practical application, because the combination of board for receiving and sending message and duplexer is uncertain, so the error that calibration program is in the past introduced mainly contains three: a) otherness of backboard differential loss (different batches, same batch of different sector, master divide the difference that collects); B) otherness of different duplexer gains; C) transceiver single board calibrating error (comprising the error that variations in temperature, external interference etc. are brought in signal source error, the calibration process).If every error all deviation is big and in the total temperature scope, these three errors are added up, and will exceed the precision of protocol requirement.
Need a kind of calibrating installation and the method that can improve base station RTWP in the prior art, improve RTWP and report precision, to be superior to the requirement of 3GPP agreement.
Summary of the invention
To above one or more problems, the invention provides a kind of calibration of power of receiving main broadband apparatus and method, can improve the calibration accuracy of RTWP, also need not other instrument and equipments, operate also simple.
Calibration of power of receiving main broadband device of the present invention comprises: matched load is connected to duplexer; Duplexer is used for the signal that antenna receives is transferred to low-converter; Low-converter is used for signal is carried out frequency conversion, and the signal after the frequency conversion is transferred to reception total wideband power detecting unit; Receive the total wideband power detecting unit, also will receive total wideband power reports to control unit to be used for receiving total wideband power according to input; And control unit, being used for makes an uproar reception total wideband power and equivalence the end to compare obtains offset and preserves offset to calibrate.
In calibration of power of receiving main broadband device of the present invention, matched load is 50 ohm.Under the situation of engineering site calibration, matched load is external load.Under the situation of Long-distance Control calibration, matched load is built-in load.
In calibration of power of receiving main broadband device of the present invention, receive the total wideband power detecting unit according to the frequency step detection signal.
Calibration of power of receiving main broadband method of the present invention may further comprise the steps: step S302 is connected to duplexer with matched load; Step S304, duplexer transfers to low-converter with the signal that antenna receives, and low-converter carries out frequency conversion and the signal after the frequency conversion is transferred to reception total wideband power detecting unit signal; Step S306, also will receive total wideband power reports to control unit according to input reception total wideband power to receive the total wideband power detecting unit; And step S308, control unit will receive total wideband power and make an uproar at the end to compare with equivalence and obtain offset and preserve offset to calibrate.
In calibration of power of receiving main broadband method of the present invention, matched load is 50 ohm.Under the situation of engineering site calibration, matched load is external load.Under the situation of Long-distance Control calibration, matched load is built-in load.Receive the total wideband power detecting unit according to the frequency step detection signal.
Through the present invention, improved the calibration accuracy of RTWP, this method can make calibration accuracy bring up to ± 1dB in, be much better than the 3GPP protocol requirement, simultaneously also need not other instrument and equipments, operate also simple.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the sketch map according to a kind of RTWP calibration steps of prior art.
Fig. 2 is the block diagram of PTWP calibrating installation according to an embodiment of the invention; And
Fig. 3 is the flow chart of RTWP calibration steps according to an embodiment of the invention.
Embodiment
With reference to accompanying drawing, specify embodiment of the present invention below.
The present invention relates to the calibration steps that a kind of mobile communication base station receives total wideband power (RTWP), belong to the mobile communcations system field, relate in particular to the base station equipment in the mobile communcations system.
Fig. 2 is the block diagram of calibration of power of receiving main broadband device according to an embodiment of the invention.As shown in Figure 2, calibration of power of receiving main broadband device of the present invention comprises: matched load 202 is connected to duplexer; Duplexer 204 is used for the signal that antenna receives is transferred to low-converter; Low-converter 206 is used for signal is carried out frequency conversion, and the signal after the frequency conversion is transferred to reception total wideband power detecting unit; Receive total wideband power detecting unit 208, also will receive total wideband power reports to control unit to be used for receiving total wideband power according to input; And control unit 210, being used for makes an uproar reception total wideband power and equivalence the end to compare obtains offset and preserves offset to calibrate.
Wherein, matched load is 50 ohm.Under the situation of engineering site calibration, matched load is external load.Under the situation of Long-distance Control calibration, matched load is built-in load.Receive the total wideband power detecting unit according to the frequency step detection signal.
Below describe a specific embodiment of the present invention, as shown in Figure 2, total noise power of receiver is:
N0＝KBT+Nf＝-174+10LogBW+Nf＝-174+10log3840000+Nf
KBT is exactly the thermal noise power (174dBm is the thermal noise power of every hertz of bandwidth under the room temperature) that receives in the broadband in the above-mentioned formula; If bandwidth in 3.84M, add the overall noise factor (in 2.8dB) of the receive path that we are present, N0=-174+10LogBW+Nf=-174+65.84+2.8=-105.36dBm then.
Therefore-and 105.36dBm is exactly the theoretical value of making an uproar the equivalent end of data feedback channel, and actual value possibly have deviation slightly, but deviation should be in ± 0.5dBm, otherwise show that noise factor worsens, and will exceed the allowed band that requires sensitivity.
The RTWP of uplink receiving channel (RSSI) value of reporting is the input signal amplitude size that is used for reflecting in real time antenna opening (duplexer mouth), through the public-measurement report reporting to RNC.The end of the RTWP module of transceiver veneer make an uproar be about-65dBm about, channel gain is 49dB, and line loss is pressed 2dB and calculated between the duplexer.The antenna opening equivalence is made an uproar at the end by-105.4dBm, and the power that then arrives before the RTWP module is-58.4dBm, and less than its end 6.6dB that makes an uproar, so the input equivalence end power of making an uproar amplifies arriving that back RTWP module can detect fully through the radio-frequency channel, but also relatively accurately.So just can, the duplexer antenna opening utilize the equivalence end to make an uproar and carry out the calibration of RTWP for benchmark after add 50 ohm matched load.
This communication base station receives the calibration steps of total wideband power, can directly carry out at engineering site, also can carry out remote calibration through the control backstage.In engineering site when calibration,, the matched load that connects 50 ohm in the antenna opening of duplexer is calibrated; During remote calibration, can switch to 50 built-in ohm through switch and calibrate.During calibration, carry out input successively according to frequency step (like 200KHz), report CPU then (promptly by the RTWP functional unit of transceiver veneer; Control unit), through calculating, draw the RTWP detected value again; Make an uproar at the end with equivalence-105.4dBm compares; The value of being compensated, write storage unit is accomplished the calibration of whole frequency.
Concrete calibration steps is following.
The first step: after the login system, if at this time have the sub-district to exist then elder generation's obstruction or deletion sub-district.
Second step: the antenna port that selection will be calibrated, if field calibration then need connect 50 ohm matched load at corresponding antenna port.
The 3rd step: after system connects, just can carry out this antenna port and calibrate, after calibration completes successfully, switch other antenna ports again and calibrate, accomplish up to whole calibrations.
Fig. 3 is the flow chart of RTWP calibration steps according to an embodiment of the invention.As shown in Figure 3, calibration of power of receiving main broadband method of the present invention may further comprise the steps: step S302 is connected to duplexer with matched load; Step S304, duplexer transfers to low-converter with the signal that antenna receives, and low-converter carries out frequency conversion and the signal after the frequency conversion is transferred to reception total wideband power detecting unit signal; Step S306, also will receive total wideband power reports to control unit according to input reception total wideband power to receive the total wideband power detecting unit; And step S308, control unit will receive total wideband power and make an uproar at the end to compare with equivalence and obtain offset and preserve offset to calibrate.
In calibration of power of receiving main broadband method of the present invention, matched load is 50 ohm.Under the situation of engineering site calibration, matched load is external load.Under the situation of Long-distance Control calibration, matched load is built-in load.Receive the total wideband power detecting unit according to the frequency step detection signal.
The mobile communication base station that the present invention proposes receives the calibrating installation and the method for total wideband power (RTWP), and operation is simple, do not need the support of other instrument and equipments, and calibration accuracy is high.
Adopt the method for the invention, compared with prior art, improved the calibration accuracy of RTWP, this method can make calibration accuracy bring up to ± 1dB in, be much better than the 3GPP protocol requirement, also need not other instrument and equipments simultaneously, operate also simple.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a calibration of power of receiving main broadband device is characterized in that, said device comprises: matched load is connected to duplexer;
Said duplexer is used for the signal that antenna receives is transferred to low-converter;
Said low-converter, the signal that is used for said antenna is received carries out frequency conversion, and the signal after the frequency conversion is transferred to reception total wideband power detecting unit;
Said reception total wideband power detecting unit is used for reporting to control unit according to the said reception total wideband power of the input after the said frequency conversion and with said reception total wideband power; And
Said control unit, being used for makes an uproar said reception total wideband power and equivalence the end to compare obtains offset and preserves said offset to calibrate.
2. calibration of power of receiving main broadband device according to claim 1 is characterized in that, said matched load is 50 ohm.
3. calibration of power of receiving main broadband device according to claim 1 and 2 is characterized in that, under the situation of engineering site calibration, said matched load is external load.
4. calibration of power of receiving main broadband device according to claim 1 and 2 is characterized in that, under the situation of Long-distance Control calibration, said matched load is built-in load.
5. calibration of power of receiving main broadband device according to claim 1 and 2 is characterized in that, said reception total wideband power detecting unit is according to the frequency step detection signal.
6. a calibration of power of receiving main broadband method is characterized in that, said method comprising the steps of:
Step S302 is connected to duplexer with matched load;
Step S304, said duplexer transfers to low-converter with the signal that antenna receives, and the signal that said low-converter receives said antenna carries out frequency conversion and the signal after the frequency conversion is transferred to reception total wideband power detecting unit;
Step S306, said reception total wideband power detecting unit after according to said frequency conversion the said reception total wideband power of input and said reception total wideband power reported to control unit; And
Step S308, said control unit make an uproar the said reception total wideband power and the equivalence end to compare and obtain offset and preserve said offset to calibrate.
7. calibration of power of receiving main broadband method according to claim 6 is characterized in that, said matched load is 50 ohm.
8. according to claim 6 or 7 described calibration of power of receiving main broadband methods, it is characterized in that under the situation of engineering site calibration, said matched load is external load.
9. according to claim 6 or 7 described calibration of power of receiving main broadband methods, it is characterized in that under the situation of Long-distance Control calibration, said matched load is built-in load.
10. according to claim 6 or 7 described calibration of power of receiving main broadband methods, it is characterized in that said reception total wideband power detecting unit is according to the frequency step detection signal.
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| CN2007100007477A CN101227211B (en) | 2007-01-19 | 2007-01-19 | Method and apparatus for calibration of power of receiving main broadband |
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| CN2007100007477A CN101227211B (en) | 2007-01-19 | 2007-01-19 | Method and apparatus for calibration of power of receiving main broadband |
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| CN103052097B (en) * | 2011-10-13 | 2018-07-20 | 南京中兴新软件有限责任公司 | The method and its equipment of RTWP are referred in a kind of determining Radio Access Network |
| CN104410469B (en) * | 2014-12-04 | 2017-04-19 | 中国电子科技集团公司第四十一研究所 | Calibration method for tracking preselector based on built-in noise source |
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| CN1633037A (en) * | 2003-12-24 | 2005-06-29 | 明基电通股份有限公司 | Antenna matching apparatus and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1633037A (en) * | 2003-12-24 | 2005-06-29 | 明基电通股份有限公司 | Antenna matching apparatus and method |
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