CN102421176A - Device and method for automatic level control of repeater - Google Patents
Device and method for automatic level control of repeater Download PDFInfo
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- CN102421176A CN102421176A CN2011104033848A CN201110403384A CN102421176A CN 102421176 A CN102421176 A CN 102421176A CN 2011104033848 A CN2011104033848 A CN 2011104033848A CN 201110403384 A CN201110403384 A CN 201110403384A CN 102421176 A CN102421176 A CN 102421176A
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Abstract
The invention relates to a device for automatic level control of a repeater. A signal channel comprises an attenuator, a mixer, an analog-to-digital converter, a power counting module and a multiplier, wherein the attenuator is used for attenuating an input radio frequency signal; the mixer is used for performing analog mixing on a signal which is output by the attenuator; the analog-to-digital converter is used for performing analog-to-digital conversion on the signal which is output by the mixer; the power counting module is used for acquiring a power counting value of the signal which is output by the analog-to-digital converter and transmitting the power counting value to a control unit of the repeater; the multiplier is used for amplifying the signal which is subjected to power counting; the attenuator, the mixer, the analog-to-digital converter, the power counting module and the multiplier are sequentially connected in series on the signal channel; and the control unit is used for respectively controlling the attenuator and the multiplier and connected with the power counting module. The invention also relates to a method for the automatic level control of the repeater. By adoption of the device and the method for the automatic level control of the repeater, regulating frequency is less, and the signal can be amplified.
Description
Technical field
The present invention relates to the communications field, more particularly, relate to a kind of device and method that is used for repeater automatic electric-level control.
Background technology
Along with development of Communication Technique, in mobile communications network, have many wireless coverages blind area or wireless signal interference range, cause that the mobile subscriber can not insert, call drop or speech quality reduces.Repeater product is released for addressing these problems; The repeater is strengthened the area of coverage of two-way relay wireless signal, can be eliminated coverage hole, allotment Zone with the telephone traffic of each sub-district of balance, at " pilot pollution " the regional dominant pilot etc. of strengthening, to reach the low-cost purpose that enlarges the wireless network coverage, optimizes network to extreme terrain.Usually, in the repeater, need carry out ALC to signal and handle, ALC (Automatic Level Control, automatic electric-level control) is a kind of technology of automatic control power output, can prevent signal overloading and optimized dynamic scope.Promptly protect device through the power-limiting input and output.Both promoted low level signal, and can not make the high level signal distortion again.In the repeater, realize ALC through the power of control input signals, it is excessive or too small to prevent to export signal.In the prior art; Also relating to some ALC device and methods, is the control that realizes attenuator through successive approximation approach mostly, and its deficiency is: for the big more situation of variable power; Need the regulated attenuator number of steps many more, just can approach the power of setting; And decay to 0 situation less than specified power and attenuator for input power, there is not the power amplification function.
Summary of the invention
The technical problem that the present invention will solve is,, defective that can not amplifying signal more to the adjusting number of times of above-mentioned prior art provides a kind of less, device and method that is used for repeater automatic electric-level control that can amplifying signal of number of times of regulating.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of device that is used for repeater automatic electric-level control; Comprise and receive the input radio frequency signal and be converted into signalling channel numeral, constant power signal output; Comprise the attenuator that the input radio frequency signal is decayed in the said signalling channel; The signal of said attenuator output is carried out the frequency mixer of analog frequency mixing, the signal of said frequency mixer output is carried out analog-to-digital analog to digital converter (A/D converter), obtains the power statistic value of said analog to digital converter output signal and is sent to the power statistic module of said repeater control unit and with the said multiplier that amplifies through the signal of power statistic; Said attenuator, frequency mixer, analog to digital converter, power statistic module and multiplier are connected in series on said signalling channel successively, and said control unit is controlled said attenuator respectively and is connected with multiplier and with said power statistic module.
At the device that is used for repeater automatic electric-level control of the present invention, said attenuator is connected with said control unit respectively with multiplier, and its pad value of adjustment and gain under the control signal of said control unit output.
At the device that is used for repeater automatic electric-level control of the present invention, said power statistic module obtains the power statistic value and is stored in the appointment register of programmable logic device.
At the device that is used for repeater automatic electric-level control of the present invention, said power statistic module and said multiplier are arranged on the same programmable logic device.
At the device that is used for repeater automatic electric-level control of the present invention, said power statistic module and said multiplier are made up of the different DSP computing units of same programmable logic device respectively.
The invention still further relates to a kind of method that is used for realizing at said apparatus automatic electric-level control, the method for said automatic electric-level control comprises the steps:
A) obtain current repeater output power value P;
B) judge that whether said present output power value P is greater than setting power value P
', in this way, the attenuation of regulating said attenuator is specified amount ATT
'Otherwise, carry out next step;
C) with current pad value ATT and present output power value P and setting power value P
'Carry out following computing: ATT+P-P
', and judge that said operation result whether more than or equal to zero, as not, jumps to step e); In this way, carry out next step;
D) attenuation of the said attenuator of adjusting is ATT+P-P
'And return steps A);
E) regulating said multiplier gain is P
'-(P+ATT), the attenuation of regulating said attenuator simultaneously is 0; And return steps A).
In the method for realization automatic electric-level control of the present invention; Said steps A) reads at interval in the said programmable logic device at setting-up time in and specify register value, be converted into present output power value P and specifying the register zero clearing in the said programmable logic device.
In the method for realization automatic electric-level control of the present invention, also comprise the steps:
M) radiofrequency signal of said attenuator output is carried out the A/D conversion;
N) obtain signal power statistics value after the said A/D conversion, and said signal power statistics value is stored in the said programmable logic device specifies in the register.
In the method for realization automatic electric-level control of the present invention, said setting-up time is spaced apart 30-80ms.
In the method for realization automatic electric-level control of the present invention, said specified amount ATT
'Maximum attenuation amount for said attenuator.
The device and method that is used for repeater automatic electric-level control of embodiment of the present invention; Has following beneficial effect: owing in signalling channel, add the multiplier that is used to amplify; And take to be different from the way that obtains the current power value in the prior art usually by the signalling channel output; The attenuation and the gain of multiplier through control unit control attenuator simultaneously is so its adjusting number of times is less, can amplifying signal.
Description of drawings
Fig. 1 is that the present invention is used for the structural representation that the device and method embodiment of repeater automatic electric-level control installs;
Fig. 2 is a flow chart of realizing automatic level control method among the said embodiment.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is described further.
As shown in Figure 1; The device and method embodiment that is used for repeater automatic electric-level control in the present invention; This device that is used for repeater automatic electric-level control comprises reception input radio frequency signal and is converted into signalling channel numeral, constant power signal output, comprises attenuator 1, (simulation) frequency mixer 2, analog to digital converter 3, power statistic module 4, multiplier 5 and control unit (MCU) 6 in the said signalling channel; Wherein, attenuator 1, frequency mixer 2, analog to digital converter 3, power statistic module 4 and multiplier 5 are connected in series on signalling channel successively, and control unit 6 is controlled the attenuation and the yield value of attenuator 1 and multiplier 5 respectively, and are connected with power statistic module 4; Attenuator 1 is decayed the input radio frequency signal; Frequency mixer 2 carries out analog frequency mixing with the signal of attenuator 1 output; Analog to digital converter 3 carries out analog-to-digital conversion with the signal of frequency mixer 2 outputs; Power statistic module 4 obtains the power statistic value of analog to digital converter 3 output signals, and sends it to the control unit 6 of repeater, and the signal that multiplier 5 will pass through after power statistic module 4 is handled amplifies.
In the present embodiment, attenuator 1 is connected with control unit 6 respectively with multiplier 5, and its pad value of adjustment and gain under the control signal of control unit 6 outputs.That is to say that the parameter of attenuator 1 and multiplier 5 changes under the control of control unit 6, and the foundation of control unit 6 control attenuators 1 and multiplier 5 is to come from the power statistic value that above-mentioned power statistic module 4 is transported to control unit 6; When above-mentioned power statistic value changed, control unit 6 made the parameter of attenuator 1 and multiplier 5 change, and is constant with the performance number that guarantees output.In the present embodiment, above-mentioned control unit 6 is MCU, and control unit 6 regularly is stored in the numerical value (this numerical value is exactly current statistics performance number) in the programmable logic device appointment register in the readout power statistical module 4.After numerical value in specifying register was read, this specified register can not brought influence to the data of back with assurance by zero clearing.In the present embodiment, power statistic module 4 and multiplier 5 are arranged on the same programmable logic device, and specifically, power statistic module 4 and multiplier 5 are made up of the different DSP computing units of same programmable logic device respectively.This programmable logic device also has other function in the repeater, for example logical transition etc. is originally just to have in this repeater.
The invention still further relates to a kind of method that in said apparatus, realizes automatic electric-level control, as shown in Figure 2, in the method, comprise the steps:
Step S11 obtains current power value P: in this step; Obtain repeater present output power value P; In the present embodiment; This current output power value P is through in the setting-up time interval, reading the appointment register value, be converted into present output power value P, will specifying the register zero clearing after reading.What store in the appointment register is the power statistic value of the current output signal of expression signal passage; Be to get constantly taking a sample according to certain sampling frequency through its signal power by power statistic module 4 (seeing also Fig. 1); After value in each designated memory is taken away, all can carry out zero clearing and handle this designated memory.After above-mentioned control unit 6 is obtained the power statistic value; It is carried out computing; Obtain present output power value P; For example; If reading and specifying the value of register is X, then the present output power value is
.
Step S12 judges that whether current power value P is greater than setting power value P
': in this step, control unit 6 judges that whether present output power value P is greater than setting power value P
', in this way, jump to step S16; Otherwise, carry out next step; In this step, above-mentioned setting power value P
'Be stored in the control unit 6, in this step, just it taken out relatively; And should value the normally transmission of the host computer through being connected with above-mentioned control unit 6, the user can make amendment to this value or set through host computer; Certainly, in some cases, also possibly be the default value that is stored in the above-mentioned control unit 6.
Step S13 is with current pad value ATT and present output power value P and setting power value P
'Carry out following computing: ATT+P-P
', and judge that whether said operation result is more than or equal to zero: in this step, judge ATT+P-P
'Value whether more than or equal to zero, if, execution in step S15; Otherwise, execution in step S14.
It is P that step S14 output control signal makes the gain of multiplier
'-(P+ATT), the attenuation of regulating said attenuator simultaneously is 0: in this step, because (ATT+P-P
') value less than zero (being that above-mentioned operation result is not more than or equal to zero), specified power value P is described
'Summation than the pad value ATT of output power signal P and attenuator is also big, just P
'>(P+ATT).Therefore needing the attenuation of the said attenuator of adjusting is 0, thereby amplifies the power of input radio frequency signal; For the above-mentioned situation in this step; Even attenuator 1 is not decayed to input signal, the power of its output is also still little than specifying power output, therefore needs to regulate the gain of multiplier 5; Make its output signal become big, keep the constant of output power value.For this reason, control unit 4 output control signals make that the gain of multiplier 5 is P
'-(P+ATT), what deserves to be mentioned is that the attenuation ATT of attenuator can not be negative, decay to more than or equal to zero so can only be provided with.
It is ATT+P-P that step S15 output control signal makes the attenuation of attenuator
': in this step, owing to judge (ATT+P-P
') value be not less than zero (being that above-mentioned operation result is more than or equal to zero); Though mean that the input power of radiofrequency signal is bigger; But the attenuation that still needs regulated attenuator 1, for this reason, control unit 6 output control signals make that the attenuation of attenuator 1 is ATT+P-P
', wherein, ATT is current attenuation, P is the present output power value, P
'It is the setting power value.
It is specified amount ATT that step S16 output control signal makes the attenuation of attenuator
': in this step, because present output power value P is greater than setting power value P
', make that for this reason the attenuation of attenuator 1 is specified amount ATT
', in the present embodiment, above-mentioned ATT
'But be the maximum pad value of this attenuator 1.
What deserves to be mentioned is that the step that above-mentioned steps has been described one-period or once regulated no matter last among step S14, S15 or the S16 which what carry out be, is all returned step S11 after the execution, begin the adjusting of following one-period.That is to say, behind execution in step S14, S15 and the S16, all return step S11.So circulation, even make the power output of this signalling channel when bigger variation appears in input signal, all can be adjusted in the time faster, be tending towards constant.
In the present embodiment, this method also comprises the steps: the radiofrequency signal of attenuator 1 output is carried out the A/D conversion; Obtain the signal power statistics value after said A/D changes, and said signal power statistics value is stored in the appointment register.In above-mentioned steps, described the power output currency and obtained at interval according to setting-up time, in the present embodiment, above-mentioned setting-up time is spaced apart 30-80ms, and a preferable value is 50ms.
In a word, after radio-frequency input signals passes through attenuator, Analogue mixer, A/D converter, get into successively and be arranged on inner power statistic module of programmable logic device FPGA and multiplier processing, export required constant power signal at last.Wherein, Control unit 6 (MCU) is responsible for regularly reading the power statistic value that programmable logic device FPGA specifies register; After the performance number of setting with host computer is carried out corresponding judgment processing; Control attenuator pad value and multiplier input value (promptly having controlled its yield value), thus realize power ALC controlled function.Host computer is used for setting flexibly required output power value.Programmable logic device FPGA inside mainly contains 2 modules: average power statistical module and multiplication module; Control unit 6 (MCU) is realized relevant control and treatment.
At first; Programmable logic device FPGA carries out power statistic through the average power statistical module to input signal; Timing statistics is 50ms (just every at a distance from 50ms, the power statistic value is deposited and specified in the register, and this value is taken away back this power statistic value of zero clearing and recomputated); And the every 50ms of control unit 6 (MCU) reads the numerical value in the disposable programmable logical device FPGA appointment register, carries out calculation process and obtains corresponding performance number.
Multiplier is mainly realized the small-signal enlarging function among the programmable logic device FPGA.To required output firm power, if the ATT pad value is 0, the input power value then needs control unit 6 (MCU) to control this multiplier input still less than power demand, realizes signal amplifying function.
The every 50ms of control unit 6 (MCU) reads disposable programmable logical device FPGA and specifies the numerical value in the register, carries out the formula operation processing and obtains performance number P, if performance number P is greater than the set point P of host computer configuration
', then control the attenuator designated value ATT that decays in advance
'(ATT
'Depend on the maximum attenuation value that attenuator allows, for example, maximum attenuation 30dB).When P is not more than P
', then judge attenuation ATT and P, the P of current attenuator
'Carry out computing (ATT+P-P
') value whether be not less than 0, if the pad value of controlling attenuator so is ATT+P-P
'If ATT+P-is P
'Less than 0, need control multiplication module amplifying signal gain P this moment
'-(P+ATT) (all the other situation, signal is constant through power behind the multiplier), the attenuation of regulating said attenuator simultaneously is 0.After carrying out aforesaid operations, if radio-frequency input signals power is constant, set ATT pad value can guarantee P=P
'Repeat above-mentioned steps, the pad value of attenuator is constant, and the multiplier settings is also constant.After having only RF input power to change, after the repetition above-mentioned steps, the pad value of attenuator changes.
In the present embodiment, no matter variable power is much, at most only needs 2 step H-section attenuator Hs just can realize power ALC control; Governing speed is fast, good stability.Increase the function that small-power is amplified to specified power simultaneously, realized the power invariability output action.
The above embodiment has only expressed several kinds of execution modes of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with accompanying claims.
Claims (10)
1. one kind is used for the device that the repeater automatic electric-level is controlled; Comprise and receive the input radio frequency signal and be converted into signalling channel numeral, constant power signal output; It is characterized in that; Comprise the attenuator that the input radio frequency signal is decayed in the said signalling channel; The signal of said attenuator output is carried out the frequency mixer of analog frequency mixing, the signal of said frequency mixer output is carried out analog-to-digital analog to digital converter, obtains the power statistic value of said analog to digital converter output signal and is sent to the power statistic module of said repeater control unit and with the said multiplier that amplifies through the signal of power statistic; Said attenuator, frequency mixer, analog to digital converter, power statistic module and multiplier are connected in series on said signalling channel successively, and said control unit is controlled said attenuator respectively and is connected with multiplier and with said power statistic module.
2. the device that is used for repeater automatic electric-level control according to claim 1 is characterized in that said attenuator is connected with said control unit respectively with multiplier, and its pad value of adjustment and gain under the control signal of said control unit output.
3. the device that is used for repeater automatic electric-level control according to claim 2 is characterized in that said power statistic module obtains the power statistic value and is stored in the appointment register of programmable logic device.
4. the device that is used for repeater automatic electric-level control according to claim 3 is characterized in that said power statistic module and said multiplier are arranged on the same programmable logic device.
5. the device that is used for repeater automatic electric-level control according to claim 4 is characterized in that said power statistic module and said multiplier are made up of the different DSP computing units of same programmable logic device respectively.
6. one kind is used for the method that the said device of claim 1 is realized automatic electric-level control, it is characterized in that, the method for said automatic electric-level control comprises the steps:
A) obtain current repeater output power value P;
B) judge that whether said present output power value P is greater than setting power value P
', in this way, the attenuation of regulating said attenuator is specified amount ATT
'Otherwise, carry out next step;
C) with current pad value ATT and present output power value P and setting power value P
'Carry out following computing: ATT+P-P
', and judge that said operation result whether more than or equal to zero, as not, jumps to step e); In this way, carry out next step;
D) attenuation of the said attenuator of adjusting is ATT+P-P
'And return steps A);
E) regulating said multiplier gain is P
'-(P+ATT), the attenuation of regulating said attenuator simultaneously is 0; And return steps A).
7. the method for realization automatic electric-level control according to claim 6; It is characterized in that; Said steps A) reads at interval in the said programmable logic device at setting-up time in and specify register value, be converted into present output power value P and specifying the register zero clearing in the said programmable logic device.
8. the method for realization automatic electric-level control according to claim 7 is characterized in that, also comprises the steps:
M) radiofrequency signal of said attenuator output is carried out the A/D conversion;
N) obtain signal power statistics value after the said A/D conversion, and said signal power statistics value is stored in the said programmable logic device specifies in the register.
9. the method for realization automatic electric-level control according to claim 8 is characterized in that said setting-up time is spaced apart 30-80ms.
10. according to the method for any described realization automatic electric-level control of claim 6-9, it is characterized in that said specified amount ATT
'Maximum attenuation amount for said attenuator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104033848A CN102421176A (en) | 2011-12-07 | 2011-12-07 | Device and method for automatic level control of repeater |
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|---|---|---|---|
| CN2011104033848A CN102421176A (en) | 2011-12-07 | 2011-12-07 | Device and method for automatic level control of repeater |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104184531A (en) * | 2014-09-02 | 2014-12-03 | 广州山锋测控技术有限公司 | Shortwave signal gain control method and system |
| CN105915240A (en) * | 2016-04-07 | 2016-08-31 | 成都华日通讯技术有限公司 | Digital terminal automatic gain control system and method based on Zynq |
| WO2021027609A1 (en) * | 2019-08-09 | 2021-02-18 | 三维通信股份有限公司 | Gain control method and apparatus |
-
2011
- 2011-12-07 CN CN2011104033848A patent/CN102421176A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104184531A (en) * | 2014-09-02 | 2014-12-03 | 广州山锋测控技术有限公司 | Shortwave signal gain control method and system |
| CN105915240A (en) * | 2016-04-07 | 2016-08-31 | 成都华日通讯技术有限公司 | Digital terminal automatic gain control system and method based on Zynq |
| CN105915240B (en) * | 2016-04-07 | 2019-02-01 | 成都华日通讯技术有限公司 | Digital end AGC system and method based on Zynq |
| WO2021027609A1 (en) * | 2019-08-09 | 2021-02-18 | 三维通信股份有限公司 | Gain control method and apparatus |
| US11863218B2 (en) | 2019-08-09 | 2024-01-02 | Sunwave Communications Co., Ltd. | Gain control method and apparatus |
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Application publication date: 20120418 |