CN100373785C - Gain correction system for reception channel in radio frequency and method - Google Patents
Gain correction system for reception channel in radio frequency and method Download PDFInfo
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- CN100373785C CN100373785C CNB2003101236193A CN200310123619A CN100373785C CN 100373785 C CN100373785 C CN 100373785C CN B2003101236193 A CNB2003101236193 A CN B2003101236193A CN 200310123619 A CN200310123619 A CN 200310123619A CN 100373785 C CN100373785 C CN 100373785C
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Abstract
The present invention relates to a gain correction system in a wireless communication system and a method thereof, and discloses a gain correction system for a radio frequency receiving channel and a method thereof. A gain correction proposal of a radio frequency ascending channel is simple, cost is decreased, and the maintainability of the system is greatly improved. The gain correction system for a radio frequency receiving channel and a method thereof comprise the radio frequency receiving channel and a power measuring component, wherein the radio frequency receiving channel is used for receiving radio frequency signals and outputting the radio frequency signals after processing the radio frequency signals, and the power measuring component is used for measuring the output power of the radio frequency receiving channel. The input end of the radio frequency receiving channel is opened or is matched with loads, and the output end of the radio frequency receiving channel is connected with the input end of the power measuring component.
Description
Technical field
The present invention relates to gain calibration system and method thereof in the wireless communication system, particularly the gain calibration system and the method thereof of the receive path of up parts in the radio communication.
Background technology
As shown in Figure 1, in the radio communication receiving system, the electromagnetic signal of radio frequency reception channel reception antenna induction is also handled, and the signal after the processing outputs to digital processing device and carries out digital processing.
Some cellular systems, as global system for mobile communications (Global Systemfor MobileCommunication, abbreviation " GSM "), Wideband Code Division Multiple Access (WCDMA) (Wideband Code DivisionMultiple Access, abbreviation " WCDMA ") in the system, the signal magnitude that generally needs the calculating radio frequency to receive is received signal field intensity (Receive Signal Strength Indicator, be called for short " RSSI "), RSSI is sent into the logical circuit of receiving system, for network switches and power is controlled foundation is provided.The method of the general RSSI of calculating is as follows in these systems: partly calculate the received signal size that radio frequency reception channel is exported by Digital Signal Processing, extrapolate the signal magnitude RSSI that the radio-frequency channel receives then, as shown in the formula,
RSSI=Power (radio frequency reception channel output signal power)-Gain (radio frequency reception channel gain)
Gain wherein is the radio frequency reception channel gain, and General System just sets at initial operating stage, is a constant.Need to prove that RSSI and Power are power level, unit is generally dBm, the gain that Gain also represents for dB.
Radio frequency Return Reception Dept. branch adopts analogue device often, and there is batch conforming problem in the radio frequency analog device, so can there be bigger fluctuation in the radio frequency reception channel gain, generally can reach 6～8dB.This has brought bigger error for system-computed RSSI, so producing or the initial general radio-frequency channel gain (Gain) that needs to proofread and correct of beginning.By proofreading and correct, reduce the gain error of radio frequency reception channel, make error can satisfy the requirement of system.
The system of now more common radio-frequency channel gain calibration scheme forms as Fig. 2, illustrates below in conjunction with Fig. 2:
This system comprises following part: parts 10 are power meters, are used to measure the power of input power meter; Parts 20 are radio frequency reception channel, and this radio frequency reception channel is supported gain calibration, and design has the Gain Adjustable device, can be the voltage controlled gain amplifier, also can be the voltage controlled attenuator; Parts 30 are signal source, are used for exporting a certain size signal.
The input of power meter 10 is connected with the output of radio frequency reception channel 20, and the input of radio frequency reception channel 20 links to each other with the output of signal source 30.
It is Gain that supposing the system requires channel gain.
The step of this method is as follows:
Step 1, with the tone signal that signal source input radio frequency receive path can receive, input signal power is fixed as P1, unit is dBm;
The power P 2 of step 2, usefulness power instrumentation amount radio frequency reception channel output signal, unit is dBm;
Step 3, can calculate radio frequency reception channel and proofread and correct the gain of preceding physical channel and be Gain1=P2-P1;
Step 4, calculate gain after, according to system requirements, regulate the gain of radio frequency reception channel;
Execution in step 2, step 3, step 4 repeatedly are until Gain1=Gain.
In actual applications, there is following problem in such scheme: adopt signal source and power meter to carry out the gain calibration of radio frequency reception channel simultaneously, the cost height of system, bearing calibration more complicated.
No matter cause a main cause of this situation to be, be to produce to proofread and correct or straightened up in place, all needs to increase the instrument configuration: signal source and power meter or frequency spectrograph, and cost will increase; If radio frequency reception channel is to be formed by connecting on frame by a plurality of modules, so just be not suitable for when producing, proofreading and correct, need in the time of beginning, carry out straightened up in place, it is very inconvenient that instrument is carried at the scene, and the maintainability of system can reduce greatly.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of radio frequency reception channel gain calibration system and method thereof, makes that radio frequency upstream channel gain correcting scheme is simple relatively, and cost reduces, and the maintainability of system improves greatly.
In order to solve the problems of the technologies described above, the invention provides a kind of radio frequency reception channel gain calibration system, comprise radio frequency reception channel, power measurement parts and gain calculating parts;
Described radio frequency reception channel is used for received RF signal, and described radiofrequency signal is handled back output, and the gain of the described radio frequency reception channel that goes out in described gain calculating component computes is regulated described gain when undesirable;
The power measurement parts are used to measure the noise power output of described radio frequency reception channel;
The gain calculating parts are used for the noise power output according to the described radio frequency reception channel of described power measurement parts measurement, the gain of calculating described radio frequency reception channel;
Wherein, the input of described radio frequency reception channel open circuit or matched load, the output of described radio frequency reception channel links to each other with the input of described power measurement parts.
Wherein, described power measurement parts are power meter.
Described power measurement parts are digital signal processor.
Described radio frequency reception channel comprises the Gain Adjustable device, and described Gain Adjustable device is used to regulate the gain of described radio frequency reception channel.
Described Gain Adjustable device is voltage controlled gain amplifier or voltage controlled attenuator.
The present invention also provides a kind of radio frequency reception channel gain calibration method, and radio frequency reception channel is not connected with signal source, comprises following steps:
A measures the noise power output of radio frequency reception channel;
The gain that B calculates described radio frequency reception channel according to the described noise power output that records;
C judges whether the gain of described radio frequency reception channel meets the requirements, if undesirable, then regulates the gain of described radio frequency reception channel, enters steps A.
In a scheme, described radio frequency reception channel input open circuit.
Among the described step B, calculate the gain G of radio frequency reception channel according to following formula:
G＝P/(K*T*Bd*(F-1))
Wherein, P is the noise power output of described radio frequency reception channel, and K is a Boltzmann constant, and T is the system works temperature, and Bd is the bandwidth of described radio frequency reception channel, and F is the channel noise coefficient of described radio frequency reception channel.
In another scheme, described radio frequency reception channel input termination matched load.
Among the described step B, calculate the gain G of radio frequency reception channel according to following formula:
G＝P/(K*T*Bd*F)
Wherein, P is the noise power output of described radio frequency reception channel, and K is a Boltzmann constant, and T is the system works temperature, and Bd is the bandwidth of described radio frequency reception channel, and F is the channel noise coefficient of described radio frequency reception channel.
By relatively finding, technical scheme difference with the prior art of the present invention is, this programme has utilized the relatively stable principle of noise factor of radio-frequency channel, utilizes radio-frequency channel noise power output to calculate the gain of passage, and undesired signal source input signal can be tested.
Difference on this technical scheme has brought comparatively significantly beneficial effect, i.e. this scheme test is simple, only needs the noise power output of testing radio frequency receive path; Testing cost descends, and has saved the cost of testing source; When system's beginning is safeguarded, do not need to carry signal source and just can proofread and correct the radio-frequency channel gain, improved the maintainability of system greatly; In the actual measurement, under the open circuit mode, the fluctuation of system noise factor generally can be controlled in the 1dB, the error of gain calculating is generally about ± 1dB, under matching way, the fluctuation of system noise factor generally can be controlled in the 1dB, and the error of gain calculating is generally less than ± 0.5dB, and these proofread and correct the result can satisfy the common engineering application need.
Description of drawings
Fig. 1 is a wireless receiving channel system schematic diagram;
Fig. 2 is the structure chart of traditional radio frequency reception channel gain calibration system;
Fig. 3 is a radio frequency reception channel gain calibration system construction drawing according to an embodiment of the invention;
Fig. 4 is a radio frequency reception channel gain calibration method flow chart according to an embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
This programme utilizes the relatively stable fact of noise factor of radio frequency reception channel, utilizes the gain of the noise power output calculating radio frequency reception channel of radio frequency reception channel.
This scheme has two kinds of different corrective systems and method:
First kind is the open circuit mode:
The noise power output (Pnoise-out) of open circuit radio frequency receive path can be drawn by following formula:
Pnoise-out＝K*T0*B*(F-1)*Gain
Wherein, K is Boltzmann constant 1.38*10
-23T0 is the system works temperature, can get 300K (K is temperature unit Kelvin); B is the bandwidth of receive path, and unit is Hz (hertz), can directly draw according to design; F is the channel noise coefficient, can directly draw according to design, and F is more stable.
So Gain=Pnoise-out/ (K*T0*B* (F-1))
Can draw by analyzing: △ G/G=(△ F/F) * (F/ (F-1)) in changing among a small circle; Wherein, △ F is the variation of noise factor, and △ G is a change in gain, and G is the abbreviation of gain G ain.
This mode is because open a way in the input port, radio-frequency channel, and the radio-frequency channel shielding is bad, when there is larger interference in the external world, can make that test is incorrect.So this mode is fit to the little occasion of external interference and uses.
Below in conjunction with a specific embodiment this scheme is described, this embodiment system forms as Fig. 3, radio frequency reception channel gain calibration system is made up of interconnective power measurement parts 40 and radio frequency reception channel 20, and radio frequency reception channel 20 also comprises the input 21 of radio frequency reception channel.
Radio frequency reception channel 20 is used for received RF signal, signal is handled and is sent into the power measurement parts, these parts are the radio frequency reception channel that needs correcting gain, and gain can be regulated by voltage controlled gain amplifier or voltage controlled attenuator, and this depends on the manufacturer of these parts.Present embodiment adopts the voltage controlled gain amplifier to regulate.
The input 21 of radio frequency reception channel is used to connect the load of radio frequency reception channel, and receives the signal that load transmitted, and the input 21 of radio frequency reception channel is open circuit in the present embodiment.
The method step that uses the open circuit mode to proofread and correct is described below in conjunction with Fig. 4:
As shown in Figure 4, enter step 110 when proofreading and correct beginning, the user obtains the bandwidth B and the channel noise coefficient F of radio frequency reception channel according to the design objective of radio frequency reception channel.
Then enter step 120, the user uses the power measurement component to measure the noise power output of radio frequency reception channel, this power unit mW, and measurement component is a power meter in this embodiment.Those of ordinary skill in the art are appreciated that with digital signal processor and substitute the measurement that power meter can be realized power equally.
Then enter step 130, according to the gain that formula calculates radio frequency reception channel, formula is Gain=Pnoise-out/ (K*T0*B* (F-1)) in the present embodiment.
Then enter step 140, judge the whether compliance with system requirement that gains, if meet then correcting process finishes, if do not meet then enter step 150.
In step 150, judge that whether the ratio of gains of radio frequency reception channel requires bigger than normal, if enter step 170, do not enter step 160.For example the ratio of gains requires the step 160 that just enters less than normal.
In step 160, regulate the gain controlling of radio frequency reception channel, the radio frequency reception channel gain is increased, then enter step 120.For example, the adjusting of gain is regulated by the voltage controlled gain amplifier in this embodiment.
In step 170, regulate the gain controlling of radio frequency reception channel, the radio frequency reception channel gain is reduced, then enter step 120.Operation in its method and the step 160 is opposite.
Test case according to real system sees that (the real system channel gain is about 60dB, pink noise coefficient 3dB), the fluctuation of system noise factor generally can be controlled in the 1dB, the error of gain calculating generally reaches ± 1dB, and this precision can reasonablely satisfy system requirements generally speaking.
Second kind is matching way:
The noise power output of radio frequency reception channel can be drawn by following formula:
Pnoise-out＝K*T0*B*F*Gain，
Wherein K is Boltzmann constant 1.38*10
-23T0 is the system works temperature, can get 300K (K is temperature unit Kelvin); B is the bandwidth of receive path, and unit is Hz (hertz), can directly draw according to design; F is the channel noise coefficient, can directly draw according to design, and F is more stable.
So Gain=Pnoise-out/ (K*T0*B*F)
Can draw by analyzing: △ G/G=△ F/F in dynamic change among a small circle; Wherein, △ F is the variation of noise factor, and △ G is a change in gain, and G is the abbreviation of gain G ain.
Below in conjunction with a specific embodiment embodiment is described, system's composition of the system's composition of this embodiment and the embodiment of open circuit mode has only a unique difference: in Fig. 3, radio frequency reception channel input 21 connects a matched load in addition, for example uses a metal cap that has 50 Ohmic resistances.Therefore omit system's composition diagram of matching way at this.
Its bearing calibration can illustrate in conjunction with Fig. 4 equally:
As shown in Figure 4, enter step 110 when proofreading and correct beginning, the user obtains the bandwidth B and the channel noise coefficient F of receive path according to the design objective of radio frequency reception channel.
Then enter step 120, the user uses the power measurement component to measure the noise power output of radio frequency reception channel, this power unit mW, and measurement component is a power meter in this embodiment.Those of ordinary skill in the art are appreciated that with digital signal processor and substitute the measurement that power meter can be realized power equally.
Then enter step 130, according to the gain that formula calculates radio frequency reception channel, formula is Gain=Pnoise-out/ (K*T0*B*F) in the present embodiment.
Then enter step 140, judge the whether compliance with system requirement that gains, if meet then correcting process finishes, if do not meet then enter step 150.
In step 150, judge that whether the ratio of gains of radio frequency reception channel requires bigger than normal, if enter step 170, do not enter step 160.For example the ratio of gains requires the step 160 that just enters less than normal.
In step 160, regulate the gain controlling of radio frequency reception channel, the radio frequency reception channel gain is increased, then enter step 120.For example, the adjusting of gain is regulated by the voltage controlled gain amplifier in this embodiment.
In step 170, regulate the gain controlling of radio frequency reception channel, the radio frequency reception channel gain is reduced, then enter step 120.Operation in its method and the step 160 is opposite.
The source of error that matching way calculates the radio frequency reception channel gain mainly is the batch consistency of channel noise coefficient, test case according to real system sees that (the real system channel gain is about 60dB, pink noise coefficient 3dB), the fluctuation of system noise factor generally can be controlled in the 1dB, so the error of gain calculating is generally less than ± 0.5dB, this error system generally can bear.
Measurement result by theory analysis and practical embodiments can be reached a conclusion: the mode correction error of the radio-frequency channel gain calibration of use matching way can be littler than the mode of the radio-frequency channel gain calibration of using the open circuit mode.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (10)
1. a radio frequency reception channel gain calibration system is characterized in that, comprises radio frequency reception channel, power measurement parts and gain calculating parts;
Described radio frequency reception channel is used for received RF signal, and described radiofrequency signal is handled back output, and the gain of the described radio frequency reception channel that goes out in described gain calculating component computes is regulated described gain when undesirable;
The power measurement parts are used to measure the noise power output of described radio frequency reception channel;
The gain calculating parts are used for the noise power output according to the described radio frequency reception channel of described power measurement parts measurement, the gain of calculating described radio frequency reception channel;
Wherein, the input of described radio frequency reception channel open circuit or matched load, the output of described radio frequency reception channel links to each other with the input of described power measurement parts.
2. radio frequency reception channel gain calibration according to claim 1 system is characterized in that described power measurement parts are power meter.
3. radio frequency reception channel gain calibration according to claim 1 system is characterized in that described power measurement parts are digital signal processor.
4. radio frequency reception channel gain calibration according to claim 1 system is characterized in that described radio frequency reception channel comprises the Gain Adjustable device, and described Gain Adjustable device is used to regulate the gain of described radio frequency reception channel.
5. radio frequency reception channel gain calibration according to claim 4 system is characterized in that described Gain Adjustable device is voltage controlled gain amplifier or voltage controlled attenuator.
6. a radio frequency reception channel gain calibration method is characterized in that radio frequency reception channel is not connected with signal source, comprises following steps:
A measures the noise power output of radio frequency reception channel;
The gain that B calculates described radio frequency reception channel according to the described noise power output that records;
C judges whether the gain of described radio frequency reception channel meets the requirements, if undesirable, then regulates the gain of described radio frequency reception channel, enters steps A.
7. radio frequency reception channel gain calibration method according to claim 6 is characterized in that, described radio frequency reception channel input open circuit.
8. radio frequency reception channel gain calibration method according to claim 7 is characterized in that, among the described step B, calculates the gain G of radio frequency reception channel according to following formula:
G＝P/(K*T*Bd*(F-1))
Wherein, P is the noise power output of described radio frequency reception channel, and K is a Boltzmann constant, and T is the system works temperature, and Bd is the bandwidth of described radio frequency reception channel, and F is the channel noise coefficient of described radio frequency reception channel.
9. radio frequency reception channel gain calibration method according to claim 6 is characterized in that, described radio frequency reception channel input termination matched load.
10. radio frequency reception channel gain calibration method according to claim 9 is characterized in that, among the described step B, calculates the gain G of radio frequency reception channel according to following formula:
G＝P/(K*T*Bd*F)
Wherein, P is the noise power output of described radio frequency reception channel, and K is a Boltzmann constant, and T is the system works temperature, and Bd is the bandwidth of described radio frequency reception channel, and F is the channel noise coefficient of described radio frequency reception channel.
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| CN100373785C true CN100373785C (en) | 2008-03-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7501895B2 (en) * | 2006-06-09 | 2009-03-10 | Seagate Technology Llc | Channel state aided automatic gain control |
| US20100007355A1 (en) * | 2008-07-10 | 2010-01-14 | Litepoint Corporation | Method for testing radio frequency (rf) receiver to provide power correction data |
| CN105137375B (en) * | 2014-05-28 | 2019-04-23 | 上海联影医疗科技有限公司 | Radio-frequency channel calibration method and device, SAR measurement method, magnetic resonance system |
| US10890958B2 (en) | 2015-09-09 | 2021-01-12 | Telefonaktiebolaget Lm Ericsson (Publ) | Centralized power meter and centralized power calculation method |
| CN106712870A (en) * | 2017-01-23 | 2017-05-24 | 上海联影医疗科技有限公司 | Magnetic resonance receiving channel calibration method, calibration device and magnetic resonance equipment |
| CN110806558B (en) * | 2020-01-07 | 2020-04-21 | 成都华日通讯技术有限公司 | Direction finding method of three-channel direction finding system based on time slice rotation |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1197559A (en) * | 1995-08-23 | 1998-10-28 | 夸尔柯姆股份有限公司 | Method and system for non-orthogonal noise energy based gain control |
| CN1230309A (en) * | 1996-07-18 | 1999-09-29 | 艾利森公司 | Compensation for second order intermodulation in homodyne receiver |
| US6286994B1 (en) * | 1998-04-29 | 2001-09-11 | Qualcomm Incorporated | System, method and computer program product for controlling a transmit signal using an expected power level |
| CN1327640A (en) * | 1999-10-04 | 2001-12-19 | Sk泰力康姆株式会社 | Apparatus and method for compensating RF gain based on measured RF noise |
| CN1420646A (en) * | 2001-11-19 | 2003-05-28 | 华为技术有限公司 | Method for measuring channel gain and gain error, delay and phase error |
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- 2003-12-12 CN CNB2003101236193A patent/CN100373785C/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1197559A (en) * | 1995-08-23 | 1998-10-28 | 夸尔柯姆股份有限公司 | Method and system for non-orthogonal noise energy based gain control |
| CN1230309A (en) * | 1996-07-18 | 1999-09-29 | 艾利森公司 | Compensation for second order intermodulation in homodyne receiver |
| US6286994B1 (en) * | 1998-04-29 | 2001-09-11 | Qualcomm Incorporated | System, method and computer program product for controlling a transmit signal using an expected power level |
| CN1327640A (en) * | 1999-10-04 | 2001-12-19 | Sk泰力康姆株式会社 | Apparatus and method for compensating RF gain based on measured RF noise |
| CN1420646A (en) * | 2001-11-19 | 2003-05-28 | 华为技术有限公司 | Method for measuring channel gain and gain error, delay and phase error |
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