CN106231667A - A kind of automatic gain control equipment and method - Google Patents
A kind of automatic gain control equipment and method Download PDFInfo
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- CN106231667A CN106231667A CN201610752396.4A CN201610752396A CN106231667A CN 106231667 A CN106231667 A CN 106231667A CN 201610752396 A CN201610752396 A CN 201610752396A CN 106231667 A CN106231667 A CN 106231667A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/52—TPC using AGC [Automatic Gain Control] circuits or amplifiers
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Abstract
The present invention relates to mobile communication technology field, be specifically related to a kind of automatic gain control equipment and a kind of auto gain control method.Described automatic gain control equipment includes: overall gain value determines unit, for calculating the statistics performance number of the digital medium-frequency signal of output after signal processing unit processes, and it is carried out threshold judgement to generate the output of overall gain adjusted value；Described signal processing unit, it adjusts the yield value of multiple signal processors in its signal processing link being had according to described overall gain adjusted value.This programme can be used in the automatic gain distribution of the multiple signal processors in signal processing link, has the feature that simple in construction easily realizes, real-time, robustness good, precision is high simultaneously.
Description
[technical field]
The present invention relates to mobile communication technology field, be specifically related to a kind of automatic gain control equipment and a kind of automatic gain
Control method.
[background technology]
In mobile communication system, make signal quality reduce owing to wireless channel existing interference signal, usually, receive
Machine system all can use automatic growth control (automatic gain control, AGC), to improve the dynamic of receiver reception
Scope.A certain fixing overall gain value in link is processed for receiver signal, reduces prime link gain, improve rear class link and increase
Benefit will certainly deteriorate system noise factor；And improve prime link gain, reduce rear class link gain and then can make system produces
Intermodulation distortion signals power increase, therefore when adjusting gain, need optimizing to enter between system noise factor and the linearity
Row is compromise, carries out automatic gain distribution and makes link performance reach optimum.
Two kinds of AGC schemes of general employing, a kind of AGC scheme is, can increase multiple letter in receiver signal processes link
Number power detection point, the power detected by each signal power test point compares with the threshold value preset, and then self adaptation
Ground adjusts link gain per stage, this gain distribution method allocative efficiency, but circuit structure is complicated, and cost is high；Another AGC
Scheme is, only detection digital medium-frequency signal power, compares it with predetermined threshold value, and be sent to comparative result automatically increase
Benefit control module, automatic growth control module, according to comparative result, is transferred to through certain gain apportioning cost that calculates again
Gain distribution module, thus selectively adjust link gain, this gain method of salary distribution circuit structure is simple, but algorithm is multiple
Miscellaneous, the real-time of gain distribution has much room for improvement.
[summary of the invention]
It is an object of the invention to provide a kind of automatic growth control scheme, specifically, it is provided that a kind of automatic growth control
Device, provides a kind of auto gain control method simultaneously.
Specifically, automatic growth control scheme is as described below:
The invention provides a kind of automatic gain control equipment, it includes:
Overall gain value determines unit, for calculating the statistics of the digital medium-frequency signal of output after signal processing unit processes
Performance number, and it is carried out threshold judgement to generate the output of overall gain adjusted value；
Described signal processing unit, it adjusts in its signal processing link being had according to described overall gain adjusted value
The yield value of multiple signal processors.
According to the present invention, for a certain constant signal processing link, its digital medium-frequency signal exported is detected
To obtain described overall gain adjusted value, and table look-up distribution yield value to each signal processor described according to this overall gain adjusted value
Part, the invention provides the scheme that a kind of simple in construction easily realizes, robustness is good, precision is high so that automatic gain distribution is in real time
Controlled.
Further, described overall gain value determines that unit includes successively:
Power statistic module, for calculating the statistics performance number of described digital medium-frequency signal；
Threshold judgement module, for by described statistics performance number compared with at least one decision threshold that it is default with life
Become court verdict；
Gain control word generation module, it is according to the described court verdict corresponding overall gain adjusted value of generation, and with correspondence
Predetermined pulse signal output overall gain adjusted value.
Preferably, described threshold judgement module is preset with following decision threshold from high to low:
First high threshold, it is higher than the second high threshold, is used for carrying out the first order with described statistics performance number and compares, if described
Statistics performance number higher than the first high threshold, then generates the first court verdict；
The second described high threshold, it is higher than preset range and less than the first high threshold, for carrying out with statistics performance number
The second level is compared, if statistics performance number is less than the first high threshold and higher than the second high threshold, then generates the second court verdict；
Low threshold, it is less than preset range, compares for carrying out the third level with statistics performance number, if statistics performance number is less than
Low threshold, then generate the 3rd court verdict.
Specifically, described threshold judgement module is preset with multiple described decision threshold, corresponding to high with therein first
Court verdict that thresholding compares and attenuation amplitude that the overall gain adjusted value that generates is characterized, more than corresponding to therein
The attenuation amplitude that court verdict that second high threshold compares and the overall gain adjusted value that generates are characterized.
The present invention introduces a kind of overflow protection mechanism by presetting multiple thresholdings；The first high threshold wherein preset is used for
The statistics performance number of judgement digital medium-frequency signal is too high to situation about processing so that baseband signal processor part, when described system
When meter performance number is too high, the yield value of each signal processor during the most significantly deamplification processes link, if in the next time
If cycle described statistics performance number remains above the first high threshold, the yield value of each signal processor of the most significantly decaying, from
And gradually adjust the yield value of each signal processor until described power statistic value is less than the first high threshold；Second preset is high
Thresholding and low threshold for regulating the yield value of signal processing link by a small margin, by will statistics performance number and the second high threshold and
Low threshold compares, and generates adjusted value by a small margin, thus gradually regulates the yield value of each signal processor in signal processing link,
Until described power statistic value is positioned at described preset range, the i.e. accessible range of signal of baseband signal processor part.This
Overflow protection mechanism overall control thinking is " decline slow play soon ", by gradually adjusting each signal processor in signal processing link
Gain, improve automatic growth control precision, enhance the robust performance of automatic growth control.
Specifically, described preset range comprises the accessible range of signal of baseband signal processor part.
Specifically, described gain control word generation module foundation first, second, third court verdict correspondence generation first,
Second, third overall gain adjusted value；Wherein, first, second overall gain adjusted value is negative value, and the first overall gain adjusted value is exhausted
The absolute value that value is adjusted more than the second overall gain；3rd overall gain adjusted value be on the occasion of.
Further, described signal processing unit includes:
Described signal processing link, including the adjustable described signal processor of multiple yield values, each signal processor
Part can adjust own gain according to its yield value received；
Gain distribution control module, for receiving the overall gain adjusted value that described overall gain value determines that unit exports, and depends on
At each signal in the matching result described signal processing link of output of this overall gain adjusted value and its gain allocation table preset
The yield value of reason device.
Further, described signal processing link includes the multiple signal processors cascaded successively:
Radio frequency signal amplifiers part, for its signal received is amplified process, amplifies signal to generate；
Frequency conversion device, for carrying out frequency conversion process to described amplification signal, to generate intermediate-freuqncy signal；
Intermediate frequency signal amplifier part, for being amplified process, to generate intermediate frequency amplification signal to described intermediate-freuqncy signal；
Modulus switching device, carries out analog digital conversion for described intermediate frequency amplifies signal, and exports described digital intermediate frequency letter
Number.
In this programme, only after described signal processing link modulus switching device, preset digital medium-frequency signal detection
Put rather than add multiple power detection point in a link, thus simplifying tradition and the structure of multiple test point is set, improve
Arithmetic speed and work efficiency, the most also have the feature that simple in construction easily realizes.
Further, described gain distribution control module includes:
Memory device, including for storing the memory block of described gain allocation table and for storing described signal processor
The depositor of yield value；Described gain allocation table is the plurality of with what described overall gain adjusted value mated for storing least one set
The increasing of the yield value prestored in the yield value of signal processor, and described gain allocation table each signal processor corresponding
Benefit value and arrange.
Control device, be used for receiving described overall gain adjusted value, inquiry and this overall gain adjusted value in gain allocation table
The yield value of each signal processor of coupling, and this yield value is sequentially output the depositor of the signal processor of correspondence
In.
Specifically, described signal processor receives yield value to adjust certainly by the way of the depositor reading its correspondence
Body gain.
Further, described overall gain value determine also include between unit and signal processing unit one transmission signal return
Road, this loop is for determining that by overall gain value the pulse signal that unit exports is sent to signal processing unit, and is used for according to institute
State the yield value of signal processor described in the statistics performance number loop control of digital medium-frequency signal, thus sentenced by repeatedly thresholding
Certainly realize the automatic growth control gradually to described digital medium-frequency signal.
Compared with prior art, overall gain value determines unit to have only in the loop to feed back the arteries and veins that overall gain adjusted value is corresponding
Rush signal, without feeding back multiple signals, thus improve the speed of gain control, meet the reality of growing communication system
Time sexual demand.
Present invention also offers a kind of auto gain control method, it includes:
Overall gain value determines that unit calculates the statistics power of the digital medium-frequency signal of output after signal processing unit processes
Value；In this programme, only calculate the statistics performance number of described digital medium-frequency signal, reduce amount of calculation, improve arithmetic speed.
Overall gain value determines that unit carries out threshold judgement to generate overall gain adjusted value to described statistics performance number, and by institute
State overall gain adjusted value and feed back to described signal processing unit；
Described signal processing unit adjusts its signal processing chain being had according to its described overall gain adjusted value received
The yield value of the multiple signal processors in road.
Further, described signal processing unit carries out radiofrequency signal amplification, mixing, intermediate frequency to received signal successively
Signal amplifies and analog digital conversion, to generate digital medium-frequency signal output.
Further, described overall gain value determine unit by described statistics performance number successively with from high to low default being higher than
First high threshold of preset range, the second high threshold compare with the low threshold less than preset range, to generate court verdict, and bag
Include:
The first order compares, and when described statistics performance number is more than the first high threshold, generates the first court verdict；
The second level is compared, and when statistics performance number is less than the first high threshold and higher than the second high threshold, generates the second judgement knot
Really；
The third level is compared, and when statistics performance number is less than low threshold, generates the 3rd court verdict.
Specifically, described overall gain value determines that described power statistic value and multiple pre-determined threshold are carried out multistage ratio by unit
Relatively, the decay that the overall gain adjusted value generated corresponding to the court verdict that compares with the first high threshold therein is characterized
Amplitude, the overall gain adjusted value generated more than the court verdict corresponding to comparing with the second high threshold therein is characterized
Attenuation amplitude.
Specifically, described preset range includes the accessible range of signal of baseband signal processor part.
Specifically, described overall gain value determines that unit generates first, the according to first, second, third court verdict correspondence
Two, the 3rd overall gain adjusted value；Wherein, first, second overall gain adjusted value is negative value, and the first overall gain adjusted value is absolute
Value is more than the absolute value of the second overall gain adjusted value；3rd overall gain adjusted value be on the occasion of.
Further, described signal processing unit receives described overall gain adjusted value, in its gain allocation table preset
The yield value of each signal processor that inquiry is mated with this overall gain adjusted value is to be respectively outputted to each signal processor
In depositor, signal processor reads the depositor of its correspondence and obtains yield value to adjust own gain.
Compared with prior art, this programme is according to obtaining corresponding each through the statistical result repeatedly tested in the development phase
Overall gain adjusted value is assigned to the yield value of each signal processor, thus is solidified into a gain allocation table and is stored at signal
In reason unit；When signal processing unit receives an overall gain adjusted value, it is only necessary to inquire about this in gain allocation table total
The occurrence of gain adjustment value just can generate the yield value of each signal processor, thus greatly reduces amount of calculation so that
Gain distribution has stronger real-time.Due to gain allocation table in the development phase through having tested in a large number so that increase
Benefit distribution also has high accuracy, regulatable feature.
Specifically, described overall gain value determine unit with the form of corresponding pulse signal feed back overall gain adjusted value to
Described signal processing unit, thus according to signal processor described in the statistics performance number loop control of described digital medium-frequency signal
Yield value, realize automatic growth control gradually to described digital medium-frequency signal by repeatedly threshold judgement.
According to the present invention, above-mentioned automatic gain control mechanism gradually is one regulatory mechanism gradually, specifically,
Introduce this mechanism on the basis of introducing described gain allocation table, make described signal processing by regulation the most in various degree
The digital medium-frequency signal of link output is stable, thus improves the robust performance of automatic growth control.
[accompanying drawing explanation]
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but the invention is not restricted to this.
Fig. 1 is the allomeric function module diagram of the automatic gain control equipment of the embodiment of the present invention；
Fig. 2 is the high-level schematic functional block diagram that the overall gain value of the embodiment of the present invention determines unit；
Fig. 3 is the threshold judgement schematic flow sheet of one embodiment of the invention；
Fig. 4 is the high-level schematic functional block diagram of the signal processing unit of the embodiment of the present invention；
Fig. 5 is the auto gain control method schematic flow sheet of the embodiment of the present invention.
[detailed description of the invention]
Below in conjunction with the accompanying drawings and the present invention is further described by embodiment, the example of described embodiment is shown in the accompanying drawings
Going out, the most same or similar label represents same or similar element or has the unit of same or like function
Part.The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining the present invention, and can not limit the present invention's
Protection domain.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative used herein " ", "
Individual ", " described " and " being somebody's turn to do " may also comprise plural form.It is to be further understood that use in the description of the present invention arranges
Diction " including " refers to there is described feature, integer, step, operation, element and/or assembly, but it is not excluded that existence or adds
Other features one or more, integer, step, operation, element, assembly and/or their group.It should be understood that wording "and/or"
The whole of item or any cell and all combinations is listed including what one or more was associated.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, and all terms used herein (include technology art
Language and scientific terminology), have with the those of ordinary skill in art of the present invention be commonly understood by identical meaning.Also should
Be understood by, those terms defined in such as general dictionary, it should be understood that have with in the context of prior art
The meaning that meaning is consistent, and unless by specific definitions as here, otherwise will not use idealization or the most formal implication
Explain.
Detailed description of the invention the following detailed description of the present invention.
Accompanying drawing 1 is the allomeric function module diagram of the automatic gain control equipment of the embodiment of the present invention, described automatic increasing
Benefit controls device and includes that overall gain value determines unit 100 and signal processing unit 200.Specifically, overall gain value determines unit 100
For calculating the statistics performance number of the digital medium-frequency signal of output after signal processing unit 200 processes, and it is carried out thresholding
Adjudicate to generate the output of overall gain adjusted value.Described signal processing unit 200 is for receiving the wireless signal from antenna 800
And it is carried out a series of signal process thus export digital medium-frequency signal, and can adjust according to described overall gain adjusted value
The yield value of the multiple signal processors in the signal processing link 201 that it is had so that the output of digital medium-frequency signal
Scope is maintained at preset range.
In Modern Communication System, being typically serially connected in after signal processing link 201 is all baseband signal processor part
700, it is therefore desirable to control signal process link 201 export baseband signal processor part 700 as much as possible can the letter of process range
Number, therefore described preset range includes the accessible scope of baseband signal processor part 700, such as, in the present invention one enforcement
In example, the accessible range of signal of baseband signal processor part 700 is 6MHz～20MHz, and preset range is 5MHz～21MHz.
Man skilled in the art be appreciated that the statistics performance number of described digital medium-frequency signal is adjusted to preset range can
Expand the scope receiving signal.
Further, accompanying drawing 2 is the high-level schematic functional block diagram that the overall gain value of the embodiment of the present invention determines unit 100, as
Shown in figure, described overall gain value determines that unit 100 includes power statistic module 101, threshold judgement module 102 and gain control successively
Word generation module 103 processed；Described power statistic module 101 is for calculating the statistics performance number of described digital medium-frequency signal；Described
Threshold judgement module 102 for by described statistics performance number compared with at least one decision threshold that it is default to generate judgement
Result；Described gain control word generation module 103, it is according to the described court verdict corresponding overall gain adjusted value of generation, and with
Corresponding predetermined pulse signal output overall gain adjusted value.
Described threshold judgement module 102 is for making decisions described statistics performance number, and this device is preset with multiple described
Decision threshold, the overall gain adjusted value generated corresponding to the court verdict that compares with the first high threshold therein is characterized
Attenuation amplitude, more than the overall gain adjusted value generated corresponding to the court verdict that compares with the second high threshold therein
The attenuation amplitude characterized.
According to foregoing description, when pre-determined threshold, the first high threshold need to be higher than the second high threshold, and this will be primarily to will unite
The signal counting performance number excessive significantly decays near preset range.Such as, in one embodiment of the present of invention, when described statistics
When performance number is more than the first high threshold, the overall gain adjusted value of generation is-10dB (decay 10dB)；When described statistics performance number is low
During in the first high threshold higher than the second high threshold, overall gain adjusted value is-1dB (decay 1dB), in the present embodiment, 10dB
Attenuation amplitude much larger than 1dB, the present inventor is by arranging two bigger high threshold of difference so that generate overall gain
The process of adjusted value is precisely, in real time.
Preferably, threshold judgement module 102 is preset with the first high threshold, the second high threshold and low threshold from high to low.Institute
Stating the first high threshold, it is higher than the second high threshold, compares for carrying out the first order with described statistics performance number, if described statistics merit
Rate value is higher than the first high threshold, then generate the first court verdict；The second described high threshold, it is higher than preset range and less than the
One high threshold, compares for carrying out the second level with statistics performance number, if statistics performance number is less than the first high threshold and higher than second
High threshold, then generate the second court verdict；Described low threshold, it is less than preset range, for carrying out the 3rd with statistics performance number
Level compares, if statistics performance number is less than low threshold, then generates the 3rd court verdict.
Those skilled in the art of the present technique are appreciated that described gain control word generation module 103 is according to first, second,
Three court verdict correspondences generate first, second, third overall gain adjusted value；Wherein, first, second overall gain adjusted value is negative
Value, and the absolute value that the absolute value of the first overall gain adjusted value adjusts more than the second overall gain；3rd overall gain adjusted value is just
Value.
Accompanying drawing 3 is the threshold judgement schematic flow sheet of one embodiment of the invention, if as it is shown on figure 3, described statistics power
Value is more than the first high threshold, then corresponding the first overall gain adjusted value generated is-10dB, and i.e. decay 10dB；If described statistics merit
Rate value is less than the first high threshold and higher than the second high threshold, then corresponding the second overall gain adjusted value generated is-1dB, i.e. decays
1dB；If described statistics performance number is less than the second high threshold and higher than described low threshold, keep overall gain adjusted value constant；If institute
State statistics performance number and be less than described low threshold, then corresponding the 3rd overall gain adjusted value generated is 1dB, i.e. improves 1dB.
The statistics performance number counted on for each cycle is carried out according to above-mentioned threshold judgement flow process, thus gradually adjusts
Joint is until the statistics performance number of described digital medium-frequency signal is adjusted to preset range, to expand follow-up baseband signal processor
The process range of part 700, reduces loss of signal to greatest extent.
Overflowing for anti-stop signal, inventor have employed above-mentioned threshold judgement flow process as overflow protection mechanism, whole judgement
Flow process is according to the principle of " decline slow play soon " so that threshold judgement flow process is both real-time, controllable again.
Accompanying drawing 4 is the high-level schematic functional block diagram of the signal processing unit 200 of the embodiment of the present invention, described signal processing list
Unit 200 includes signal processing link 201 and gain distribution control module 202, and described signal processing link 201, including multiple
The adjustable described signal processor of yield value, each signal processor can adjust self according to its yield value received and increase
Benefit；Described gain distribution control module 202, the overall gain determining that unit 100 exports for receiving described overall gain value adjusts
Value, and export described signal processing link 201 according to the matching result of this overall gain adjusted value with its gain allocation table preset
In the yield value of each signal processor.
Further, described signal processing link 201 includes the multiple signal processors cascaded successively, believes including radio frequency
Number amplifying device 2011, frequency conversion device 2012, intermediate frequency signal amplifier part 2013, modulus switching device 2014；Described penetrate
Frequently signal amplifier part 2011 such as low-noise amplifier, for its signal received is amplified process, puts to generate
Big signal；Described frequency conversion device 2012 such as frequency mixer, for carrying out frequency conversion process, with life to described amplification signal
Become intermediate-freuqncy signal；Described intermediate frequency signal amplifier part 2013 such as intermediate frequency amplifier, for being amplified described intermediate-freuqncy signal
Process, to generate intermediate frequency amplification signal；Described modulus switching device 2014 such as ADC24 chip, for amplifying described intermediate frequency
Signal carries out analog digital conversion, and exports described digital medium-frequency signal.
Man skilled in the art be appreciated that described signal processing link 201 when receiving wireless signal, meeting
It is amplified wireless signal strengthening faint wireless signal；It can be appreciated that strengthened signal is carried out Frequency mixing processing, example
As the signal of high band is mixed into intermediate-freuqncy signal；It can be appreciated that the digital medium-frequency signal of described signal processing unit 200 output
It is the digital medium-frequency signal after analog digital conversion, its power detection point only one of which, and it is arranged at modulus switching device 2014
Afterwards.
It can be appreciated that described signal processing link 201 can comprise multiple identical signal processor, such as, concatenate
Two low-noise amplifiers；It can be appreciated that described signal processing link 201 can also include that other are favourable to signal processing
Signal processor, such as wave filter.
Consider disclosed by the invention in the case of, staff in this area is it is understood that at the dress of the embodiment of the present invention
The signal processing link 201 put adds, reduces some signal processors and be apparent from, as long as not affecting the most defeated
The signal gone out is digital medium-frequency signal；The integrated chip being additionally based on the disclosure and be designed to and basic functional principle phase of the present invention
With, belonging to the expanded application of the present invention, this technology is deeply apparent from, and should be included in the model of the claim of the present invention
In enclosing.
Further, described gain distribution control module 202 includes memory device 2021 and controls device 2022, described in deposit
Memory device 2021 includes the memory block for storing described gain allocation table and for storing described signal processor yield value
Depositor；Those skilled in the art of the present technique are appreciated that described gain distributes the most programmable process of control module 202
Unit, specifically, such as DSP, FPGA, single-chip microcomputer.
Described gain allocation table is for storing at the plurality of signal that least one set is mated with described overall gain adjusted value
The yield value of reason device, and the yield value of the yield value that prestores in described gain allocation table each signal processor corresponding and
Arrange；Described control device 2022, is used for receiving described overall gain adjusted value, and in gain allocation table, inquiry is adjusted with this overall gain
The yield value of each signal processor of whole value coupling, and this yield value is sequentially output posting of corresponding signal processor
In storage.Such as, when the overall gain adjusted value that described signal processing unit 200 receives is 40dB, the most described control device
2022 table look-up obtain the low-noise amplifier gain matched of corresponding 40dB overall gain adjusted value be 20dB, mixer gain be
10dB, Intermediate frequency amplifier gain are 10dB, in the depositor of the signal processor exporting correspondence immediately.
It should be evident that gain allocation table such as store the gain scale value of each signal processor gain allocation table,
The gain allocation table of the difference storing each signal processor is all effective for the present invention, and the present invention is to gain allocation table
Forms of distribution do not limit.
And those skilled in the art of the present technique are it can be appreciated that described signal processor is by reading the depositor of its correspondence
Mode receives yield value to adjust own gain.
Specifically, described overall gain value determine also include between unit 100 and signal processing unit 200 one transmission signal
Loop, this loop for overall gain value is determined that the pulse signal that unit 100 exports is sent to signal processing unit 200, and
For the yield value according to signal processor described in the statistics performance number loop control of described digital medium-frequency signal, thus pass through
Repeatedly threshold judgement realizes the automatic growth control gradually to described digital medium-frequency signal.Man skilled in the art is permissible
Understand, in loop transmit signal frequency can quickly, for signal processing unit 200, receive multiple overall gain adjusted value and with
Its mode being averaging is asked for overall gain adjusted value meansigma methods again table look-up distribution yield value be possible.
The invention also discloses a kind of auto gain control method, see accompanying drawing 5, comprise the steps:
S601: overall gain value determines that unit 100 calculates the digital medium-frequency signal of output after signal processing unit 200 processes
Statistics performance number；
It is preferred that the algorithm calculating described statistics performance number is squared computing, but other algorithms should be used for this invention
Also being apparent from, algorithm is not limited by the present invention；
Specifically, described signal processing unit 200 successively received signal is carried out radiofrequency signal amplification, mixing, in
Frequently signal amplifies and analog digital conversion, to generate digital medium-frequency signal output.
S602: overall gain value determines that unit 100 carries out threshold judgement and adjusts to generate overall gain described statistics performance number
Value, and described overall gain adjusted value is fed back to described signal processing unit 200；
Specifically, described overall gain value determines that described power statistic value is carried out multistage with multiple pre-determined threshold by unit 100
Relatively, what the overall gain adjusted value generated corresponding to the court verdict that compares with the first high threshold therein was characterized declines
Amount of decrease degree, the overall gain adjusted value institute table generated more than the court verdict corresponding to comparing with the second high threshold therein
The attenuation amplitude levied.
S603: described signal processing unit 200 adjusts its letter being had according to its described overall gain adjusted value received
Number process the yield value of multiple signal processors in link 201.
Specifically, described signal processing unit 200 receives described overall gain adjusted value, in its gain allocation table preset
The yield value of each signal processor that inquiry is mated with this overall gain adjusted value is to be respectively outputted to each signal processor
In depositor, signal processor reads the depositor of its correspondence and obtains yield value to adjust own gain.
Further, described overall gain value determine unit 100 by described statistics performance number successively with from high to low default
Compare with the low threshold less than preset range higher than the first high threshold, second high threshold of preset range, to generate judgement knot
Really, compare including the first order, the second level is compared and is compared with the third level: the described first order compares, when described statistics performance number exceedes
During the first high threshold, generate the first court verdict；The described second level is compared, when statistics performance number less than the first high threshold and is higher than
Second high threshold, generates the second court verdict；The described third level is compared, and when statistics performance number is less than low threshold, generates the 3rd and sentences
Certainly result.
Specifically, described overall gain value determine unit 100 according to first, second, third court verdict correspondence generate first,
Second, third overall gain adjusted value；Wherein, first, second overall gain adjusted value is negative value, and the first overall gain adjusted value is exhausted
The absolute value that value is adjusted more than the second overall gain；3rd overall gain adjusted value be on the occasion of.
Man skilled in the art is appreciated that described preset range includes that baseband signal processor part 700 can be located
The range of signal of reason.
Specifically, described overall gain value determines that unit 100 feeds back overall gain with the form of corresponding pulse signal and adjusts
It is worth to described signal processing unit 200, thus according to signal described in the statistics performance number loop control of described digital medium-frequency signal
The yield value of processing apparatus, realizes the automatic growth control gradually to described digital medium-frequency signal by repeatedly threshold judgement.
It can be appreciated that the corresponding unique pulse signal of each overall gain adjusted value, and for the attribute of pulse signal, this
Invention does not limits.
In sum, the auto gain control method of the present invention and device, it is achieved that the multiple letters in signal processing link
The automatic gain distribution of number processing apparatus, has the spy that simple in construction easily realizes, real-time, robustness good, precision is high simultaneously
Point.
Above automatic growth control scheme provided by the present invention is described in detail, for the general skill of this area
Art personnel, according to the thought of the embodiment of the present invention, the most all will change, to sum up institute
Stating, this specification content should not be construed as limitation of the present invention.
Claims (19)
1. an automatic gain control equipment, it is characterised in that comprising:
Overall gain value determines unit, for calculating the statistics power of the digital medium-frequency signal of output after signal processing unit processes
Value, and it is carried out threshold judgement to generate the output of overall gain adjusted value；
Described signal processing unit, it adjusts in its signal processing link being had many according to described overall gain adjusted value
The yield value of individual signal processor.
Automatic gain control equipment the most according to claim 1, it is characterised in that described overall gain value determines that unit is successively
Including:
Power statistic module, for calculating the statistics performance number of described digital medium-frequency signal；
Threshold judgement module, for sentencing described statistics performance number to generate compared with its at least one decision threshold preset
Certainly result；
Gain control word generation module, it generates corresponding overall gain adjusted value according to described court verdict, and with corresponding pre-
If output of pulse signal overall gain adjusted value.
Automatic gain control equipment the most according to claim 2, it is characterised in that described threshold judgement module is from high to low
It is preset with following decision threshold:
First high threshold, it is higher than the second high threshold, compares for carrying out the first order with described statistics performance number, if described statistics
Performance number is higher than the first high threshold, then generate the first court verdict；
The second described high threshold, it is higher than preset range and less than the first high threshold, for carrying out second with statistics performance number
Level compares, if statistics performance number is less than the first high threshold and higher than the second high threshold, then generates the second court verdict；
Low threshold, it is less than preset range, compares for carrying out the third level with statistics performance number, if statistics performance number is less than low door
Limit, then generate the 3rd court verdict.
Automatic gain control equipment the most according to claim 2, it is characterised in that described threshold judgement module is preset with many
Individual described decision threshold, the overall gain generated corresponding to the court verdict that compares with the first high threshold therein adjusts
The attenuation amplitude that value is characterized, the total increasing generated more than the court verdict corresponding to comparing with the second high threshold therein
The attenuation amplitude that benefit adjusted value is characterized.
Automatic gain control equipment the most according to claim 3, it is characterised in that described preset range includes baseband signal
The accessible range of signal of processing apparatus.
Automatic gain control equipment the most according to claim 3, it is characterised in that described gain control word generation module depends on
First, second, third overall gain adjusted value is generated according to first, second, third court verdict correspondence；Wherein, first, second always increases
Benefit adjusted value is negative value, and the absolute value of the first overall gain adjusted value is more than the absolute value of the second overall gain adjusted value；3rd is total
Gain adjustment value be on the occasion of.
Automatic gain control equipment the most according to claim 1, it is characterised in that described signal processing unit includes:
Described signal processing link, including the adjustable described signal processor of multiple yield values, each signal processor energy
Enough according to its yield value received adjustment own gain；
Gain distribution control module, for receiving the overall gain adjusted value that described overall gain value determines that unit exports, and according to being somebody's turn to do
Overall gain adjusted value exports each signal processor in described signal processing link with the matching result of its gain allocation table preset
The yield value of part.
Automatic gain control equipment the most according to claim 7, it is characterised in that described signal processing link includes successively
Multiple signal processors of cascade:
Radio frequency signal amplifiers part, for its signal received is amplified process, amplifies signal to generate；
Frequency conversion device, for carrying out frequency conversion process to described amplification signal, to generate intermediate-freuqncy signal；
Intermediate frequency signal amplifier part, for being amplified process, to generate intermediate frequency amplification signal to described intermediate-freuqncy signal；
Modulus switching device, carries out analog digital conversion for described intermediate frequency is amplified signal, and exports described digital medium-frequency signal.
Automatic gain control equipment the most according to claim 7, it is characterised in that described gain distribution control module bag
Include:
Memory device, including for storing the memory block of described gain allocation table and for storing described signal processor gain
The depositor of value；Described gain allocation table is for storing the plurality of signal that least one set is mated with described overall gain adjusted value
The yield value of the yield value prestored in the yield value of processing apparatus, and described gain allocation table each signal processor corresponding
And arrange；
Control device, be used for receiving described overall gain adjusted value, inquire about in gain allocation table and mate with this overall gain adjusted value
The yield value of each signal processor, and in the depositor of the signal processor that this yield value is sequentially output correspondence.
Automatic gain control equipment the most according to claim 9, it is characterised in that described signal processor is by reading
The mode of the depositor taking its correspondence receives yield value to adjust own gain.
11. automatic gain control equipments according to claim 1, it is characterised in that described overall gain value determine unit and
Also including the loop of a transmission signal between signal processing unit, this loop is for determining, by overall gain value, the arteries and veins that unit exports
Rush signal and be sent to signal processing unit, and for believing according to described in the statistics performance number loop control of described digital medium-frequency signal
The yield value of number processing apparatus, thus realize the automatic gain control gradually to described digital medium-frequency signal by repeatedly threshold judgement
System.
12. 1 kinds of auto gain control methods, it is characterised in that including:
Overall gain value determines that unit calculates the statistics performance number of the digital medium-frequency signal of output after signal processing unit processes；
Overall gain value determines that unit carries out threshold judgement to generate overall gain adjusted value to described statistics performance number, and by described always
Gain adjustment value feeds back to described signal processing unit；
Described signal processing unit adjusts in its signal processing link being had according to its described overall gain adjusted value received
The yield value of multiple signal processors.
13. auto gain control methods according to claim 12, it is characterised in that described signal processing unit is the most right
Received signal carries out radiofrequency signal amplification, mixing, intermediate-freuqncy signal amplification and analog digital conversion, defeated to generate digital medium-frequency signal
Go out.
14. auto gain control methods according to claim 12, it is characterised in that described overall gain value determines that unit will
Described statistics performance number successively with from high to low default the first high threshold higher than preset range, the second high threshold and less than pre-
If the low threshold of scope compares, to generate court verdict, including:
The first order compares, and when described statistics performance number is more than the first high threshold, generates the first court verdict；
The second level is compared, and when statistics performance number is less than the first high threshold and higher than the second high threshold, generates the second court verdict；
The third level is compared, and when statistics performance number is less than low threshold, generates the 3rd court verdict.
15. auto gain control methods according to claim 12, it is characterised in that described overall gain value determines that unit will
Described power statistic value carries out multistage comparison with multiple pre-determined threshold, corresponds to and sentencing that the first high threshold therein compares
Certainly result and attenuation amplitude that the overall gain adjusted value that generates is characterized, more than corresponding to comparing with the second high threshold therein
The attenuation amplitude that court verdict relatively and the overall gain adjusted value that generates are characterized.
16. auto gain control methods according to claim 14, it is characterised in that described preset range includes that base band is believed
Number accessible range of signal of processing apparatus.
17. auto gain control methods according to claim 14, it is characterised in that described overall gain value determines that unit depends on
First, second, third overall gain adjusted value is generated according to first, second, third court verdict correspondence；Wherein, first, second always increases
Benefit adjusted value is negative value, and the absolute value of the first overall gain adjusted value is more than the absolute value of the second overall gain adjusted value；3rd is total
Gain adjustment value be on the occasion of.
18. auto gain control methods according to claim 12, it is characterised in that described signal processing unit receives institute
State overall gain adjusted value, each signal processor that inquiry is mated in its gain allocation table preset with this overall gain adjusted value
Yield value to be respectively outputted in the depositor of each signal processor, signal processor reads the depositor of its correspondence and obtains
Take yield value to adjust own gain.
19. auto gain control methods according to claim 12, it is characterised in that described overall gain value determine unit with
The form feedback overall gain adjusted value of corresponding pulse signal gives described signal processing unit, thus according to described digital intermediate frequency
The yield value of signal processor described in the statistics performance number loop control of signal, is realized described number by repeatedly threshold judgement
Gradually the automatic growth control of word intermediate-freuqncy signal.
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