CN101882918A - Automatic gain control method and device - Google Patents

Automatic gain control method and device Download PDF

Info

Publication number
CN101882918A
CN101882918A CN2009101371135A CN200910137113A CN101882918A CN 101882918 A CN101882918 A CN 101882918A CN 2009101371135 A CN2009101371135 A CN 2009101371135A CN 200910137113 A CN200910137113 A CN 200910137113A CN 101882918 A CN101882918 A CN 101882918A
Authority
CN
China
Prior art keywords
gain
value
signal
yield value
gain control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN2009101371135A
Other languages
Chinese (zh)
Other versions
CN101882918B (en
Inventor
侯信安
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Industrial Technology Research Institute ITRI
Original Assignee
Industrial Technology Research Institute ITRI
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Industrial Technology Research Institute ITRI filed Critical Industrial Technology Research Institute ITRI
Priority to CN200910137113.5A priority Critical patent/CN101882918B/en
Publication of CN101882918A publication Critical patent/CN101882918A/en
Application granted granted Critical
Publication of CN101882918B publication Critical patent/CN101882918B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

The invention discloses an automatic gain control method and an automatic gain control device, which are used for controlling a gain value of a received signal. The method comprises the following step of: at the same time of regulating and converging the gain value, entering a searching mode to additionally change the gain value at least once to make the gain value approximate to a target level according to at least one characteristic value of relation indicating the change of the gain value with time. In another embodiment, the method further comprises the step of: entering a tracking mode to make the regulation period of gain longer than that before in a periodical gain regulation way so as to reduce introduced noise energy in the tracking of signal strength. Therefore, the embodiment of the invention can improve gain convergence speed, further reduce the influence of noises to a communication system in a mobile receiving environment and improve signal receiving efficiency.

Description

Auto gain control method and device
Technical field
The present invention relates to the processing method and the signal receiving device of received signal.
Background technology
Communication system general reference application signal strength signal intensity or its numerical value of deriving carry out the system of demodulation coding, comprise wired and wireless telecommunication system, broadcast and access communication system.In general communication system, signal strength signal intensity is subjected to the properties influence of channel and rises and falls under different channels, if the intensity of the received signal of receiving terminal sees through the automatic gain controller adjustment, received signal is maintained in the constant intensity scope, in order to avoid the message of receiving terminal erroneous judgement received signal.
Yet in real system, be not to immobilize as perfection as the above-mentioned hypothesis through automatic gain controller adjusted signal strength signal intensity.Below with Gaussian channel environment explanation automatic gain device in Gaussian channel and fixing operation principles in the multi-path channel environment.Under the Gaussian channel environment, automatic gain controller is adjusted the loop gain size, and is weighing between the gain degree of jitter under gain convergence rate and the stable state.When loop gain was big, it was fast to converge to desirable accurate bit rate, but in desirable accurate position up and down shake acutely as the gain curve 100 shown in after the time point t1 among Fig. 1 in the shake up and down of desirable accurate position 10.When loop gain hour, if switching point is not good, it is slow that gain converges to desirable accurate bit rate, but in desirable accurate position up and down shake relax shown in the dotted line 110 or 120 of the expression change in gain of Fig. 1.
So system designer is put forward the method for various adjustment gains to improve the situation of gain shake under gain convergence rate and the stable state.For example the United States Patent (USP) numbering 7336743, and the method characteristics of proposition are adjusted the algorithm of control signal generator for gain.This method is divided into coarse adjustment and two stages of fine tuning, and utilizes application step-by-step system adjustment gain in the coarse adjustment stage, improves the gain convergence rate.The coarse adjustment method is increase, minimizing for the direction that determines according to signal strength signal intensity comparison device result to adjust, or remains unchanged, and the gain size that increases at every turn or reduce is to preset fixed value.For example United States Patent (USP) numbers 7295073 again, and the method characteristics that it proposed are basis signal peak swing adjustment gain, makes the signal of sampling in the analog-digital converter scope that maximum service efficiency be arranged.This method integrated signal intensity estimates that relatively function is in the accurate bit detector of amplitude with signal strength signal intensity, and the output testing result is to range detector.Range detector determines the direction of adjusting to be increase, minimizing according to the accurate bit detector result of amplitude, or remains unchanged, and the gain size that increases at every turn or reduce is to preset fixed value.
But under the movable passageway environment, automatic gain controller is stablized in the process of trace signals Strength Changes and compensating for path loss immediately, constantly adjust signal strength signal intensity at the symbol sign indicating number in cycle time, cause introducing the receiving efficiency of extra jittering noise deterioration receiver.For example, existing automatic gain controller, as United States Patent (USP) numbering 7336743,7295073,7031409 and 6574292 patent proposed all gains with the adjustment of system works frequency period formula, in mobile environment, introduce the receiving efficiency of extra jittering noise deterioration receiver, so it is subjected to nonlinear noise and the mobile channel influence is also big.
Generally speaking, existing automatic gain controller can't effectively be taken into account the problem that can introduce noise when following the trail of path loss variation in order to improve the gain convergence rate, makes in mobile environment, influences its receiving efficiency greatly.
Summary of the invention
The present invention is a kind of auto gain control method and device, can be applied to different reception environments, to improve the usefulness that signal receives.Receive or move in the environment that receives fixing, when yield value was adjusted with convergence, searching modes determined at least one switching value and changes this yield value according to this in addition to shorten the gain convergence time.Moreover in other embodiments, after searching modes, the tracking pattern is to adjust gain mode with periodic, introduces noise energy when reducing trace signals intensity, in mobile reception environment.So, embodiments of the invention can improve the gain convergence rate; In addition, under high-speed mobile environment, other embodiments of the invention can also reduce the influence of noise to system.So under different reception environments, embodiments of the invention all can improve receiver usefulness.
According to a first aspect of the invention, a kind of auto gain control method is proposed, the method comprises: in a searching modes, one yield value of one received signal is gained when adjusting, situation of change according to a gain curve of yield value, change yield value in addition at least once so that yield value tends to the accurate position of a target gain, wherein, the step that changes yield value in addition comprises: at least one characteristic point that detects gain curve; According to detected at least one characteristic point, determine a switching value, switching value with so that yield value near the accurate position of target gain; And, set yield value and be a new gain value and make it to come into force according to switching value; Wherein, the step of above-mentioned detection, decision and setting is performed once at least.
In other embodiment of foundation said method, also comprise: after the step of setting yield value is performed for the last time, enter a tracking pattern, in the tracking pattern, periodically judge whether to adjust yield value, wherein, yield value controlled cycle in the tracking pattern is carried out the cycle that gain is adjusted greater than yield value in searching modes.
According to a second aspect of the invention, propose a kind of automatic gain control equipment, this device comprises: a variable gain amplifying unit, an analog-digital converter, a detecting unit and a control unit.The variable gain amplifying unit is in order to control a received signal to produce one first signal according to a yield value.Analog-digital converter is in order to produce a digital signal according to first signal.Detecting unit in order to a foundation digital signal and an order normal bit signal, produces a gain signal.Control unit produces a gain control signal in order to the foundation gain signal, and wherein, the yield value of variable gain amplifier is to adjust according to gain control signal.When control unit operated in a searching modes, control unit according at least one characteristic value that the time dependent pass of yield value is, changed yield value at least once so that yield value tends to the accurate position of a target gain in addition when yield value gains adjustment.
According to a third aspect of the invention we, propose a kind of automatic gain control equipment, this device comprises: a variable gain amplifying unit, an analog-digital converter and a control unit.The variable gain amplifying unit is in order to control a received signal to produce one first signal according to a yield value.Analog-digital converter is in order to produce a digital signal according to first signal.Control unit produces a gain control signal in order to a foundation digital signal and an order normal bit, and wherein, the yield value of variable gain amplifier is to adjust according to gain control signal.When control unit operated in a searching modes, control unit according at least one characteristic value that the time dependent pass of yield value is, changed yield value at least once so that yield value tends to the accurate position of a target gain in addition when yield value gains adjustment.
According to a forth aspect of the invention, propose a kind of automatic gain control equipment, automatic gain control equipment comprises: a variable gain amplifying unit, an analog-digital converter, a power discriminator and a control unit.The variable gain amplifying unit is in order to control a received signal to produce one first signal according to a yield value.Analog-digital converter is in order to produce a digital signal according to first signal.The power discriminator in order to a foundation digital signal and an order normal bit signal, produces a comparison signal.Control unit produces a gain control signal in order to the foundation comparison signal, and wherein, the yield value of variable gain amplifier is adjusted according to gain control signal.When control unit operated in a searching modes, control unit according at least one characteristic value that the time dependent pass of yield value is, changed yield value at least once so that yield value tends to the accurate position of a target gain in addition when yield value gains adjustment.
In other embodiment of the device of foundation the invention described above, after the last yield value of setting in addition comes into force, enter or optionally enter a tracking pattern, in the tracking pattern, control unit periodically judges whether to adjust yield value, wherein, yield value controlled cycle in the tracking pattern is carried out the cycle that gain is adjusted greater than yield value in searching modes.
For foregoing of the present invention can be become apparent, embodiment cited below particularly, and cooperate appended graphicly, be described in detail below:
Description of drawings
Fig. 1 illustrates the gain convergence curve of different circuit gain under Gaussian channel;
Fig. 2 illustrates the gain convergence curve of different circuit gain under movable passageway;
Fig. 3 A, Fig. 3 B and Fig. 3 C illustrate the schematic diagram of an embodiment who is applied to mobile reception environment of auto gain control method of the present invention;
Fig. 3 D illustrates the fixedly schematic diagram of an embodiment of reception environment that is applied to of auto gain control method of the present invention;
Fig. 4 A illustrates auto gain control method of the present invention and is applied to the fixedly flow chart of an embodiment of reception environment;
Fig. 4 B illustrates the flow chart that auto gain control method of the present invention is applied to an embodiment of mobile reception environment;
Fig. 4 C illustrates the flow chart that auto gain control method of the present invention is selectively used for an embodiment of fixing reception or mobile reception environment;
Fig. 4 D illustrates the flow chart of an embodiment of the tracking pattern of auto gain control method of the present invention;
Fig. 5 A and Fig. 5 B illustrate in the searching modes of auto gain control method of the present invention, with local maximum and minimum value during as the characteristic value of change in gain, and the schematic diagram of the embodiment of its deciding means;
Fig. 6 illustrates in the searching modes of auto gain control method of the present invention, with the point of inflexion during as the characteristic value of change in gain, and the schematic diagram of the embodiment of its deciding means;
Fig. 7 A illustrates the schematic diagram of gain delta transfer function indicatrix parameter-definition;
Fig. 7 B and Fig. 7 C illustrate the example of gain delta transfer function indicatrix parameter-definition;
Fig. 8 A illustrates the calcspar of an embodiment of automatic gain control equipment of the present invention;
Fig. 8 B illustrates the calcspar of another embodiment of automatic gain control equipment of the present invention;
Fig. 9 A illustrates among the embodiment of automatic gain control equipment of the present invention of Fig. 8, the calcspar of one first execution mode of control unit;
Fig. 9 B illustrates among the embodiment of automatic gain control equipment of the present invention of Fig. 8, the calcspar of one second execution mode of control unit;
Fig. 9 C illustrates among the embodiment of automatic gain control equipment of the present invention of Fig. 8, the calcspar of one the 3rd execution mode of control unit;
Fig. 9 D illustrates among the embodiment of automatic gain control equipment of the present invention of Fig. 8, the calcspar of one the 4th execution mode of control unit;
Figure 10 illustrates the calcspar of another embodiment of automatic gain control equipment of the present invention;
Figure 11 A and Figure 11 B illustrate gain curve figure and see through the example that the measurement mode is calculated the switching point of searching modes with signal;
Figure 12 illustrates the calcspar of another embodiment of automatic gain control equipment of the present invention.
[main element symbol description]
10,301,501,1101: the accurate position of The perfect Gain
100,110,120,230,250,300,500,1100,1120: gain curve
200: intensity curves under path loss and the Doppler effect
201-204: the trough of intensity curves
210: path loss
231-234: the crest of gain curve
240: the path loss compensation
311,312: gain is switched time point a little
510: the single order differential of gain curve
520: the second-order differential of gain curve
710,720: the gain delta transformation curve
800A, 800B, 1000,1200: automatic gain control equipment
810: the variable gain amplifying unit
820: analog-digital converter
830: detecting unit
831: power detector
833: comparator
835,1230: loop filter
840A, 840B, 900A, 900B, 900C, 900D, 1010,1220: control unit
910,1290: controller
930,930A, 930B: switching value decision unit
931: the ranking operation device
933: maximum detection unit
935: the minimum value detecting unit
936: the second-order differential device
938: switching value retrieval control unit
939: buffer
940A, 940B, 1270: gain tracing unit
950A, 950B: tracking value generator
951a, 951b: function generating circuit
952: arithmetic element
953: adder
955: subtracter
957: multiplexer
959: latch unit
961: the periodic pulses generator
970: the gain storage element
1110,1130: the difference of the accurate position of maximum and The perfect Gain
1115,1135: the difference of the accurate position of minimum value and The perfect Gain
1210: the power discriminator
1250: the gain detecting unit
Embodiment
The different embodiment of auto gain control method of the present invention, propose respectively searching modes, tracking pattern with and combination, to improve the gain convergence rate under the various reception environments.In addition, auto gain control method of the present invention is applied to the embodiment of mobile reception environment, promotes can reduce the influence of noise to system when path loss compensates under mobile reception environment.So the signal receiving efficiency is improved.
In communication system, the gain curve of the yield value of automatic gain controller is in convergence process, yield value is controlled by a kind of automatic gain control mode and is adjusted, gain curve 100 as shown in Figure 1, roughly can be with desirable accurate position 10 in the characteristic of concussion up and down.One embodiment of the inventive method, be in the gain convergence, enter a searching modes, according to yield value at least one characteristic value over time, for example local maximum and minimum value, change yield value in addition at least once so that yield value tends to the accurate position of a target gain, wherein, need be by finding out at least one characteristic value to calculate the size of a switching value in the previous yield value with the yield value that determines to change in addition.If with the idea of gain curve, promptly be a switching point of decision gain curve, will gain switches to the accurate position of target gain in fact, just near the accurate position of target gain or its, restrains required time with quick shortening gain.In Fig. 3 A, gain curve 300 switches near the numerical value under the accurate position 301 of gain behind time point 311.Moreover, in another example, also can follow similar manner and seek next switching point, with more approaching desirable accurate position, shown in Fig. 3 B, after time point 311, gain curve 300 switches on the accurate position 301 of gain, and continues to follow original automatic gain control mode of carrying out to change and the trend convergence, after through once local maximum and minimum value, find another suitable switching point, when time point 312, switch to numerical value near the accurate position 301 of gain.
After through change action at least once, an embodiment of the inventive method enters another pattern, is called the tracking pattern, the gain curve 300 behind gain curve 300 behind the time point 311 of the variation of gain curve 300 such as Fig. 3 A or the time point 312 of Fig. 3 B.Please refer among Fig. 3 C, it is in the tracking pattern of Fig. 3 B, the schematic diagram of gain curve behind magnification ratio, and the dotted line of the longitudinal axis is wherein represented the update cycle, and how gain curve 300 is periodically determined also new numerical value.
In order more to understand the effect of the pattern of following the trail of in the above embodiment of the present invention, below changing situation with mobile channel environment lower channel is example, illustrate under gain convergence rate and the stable state and must make measurement between the gain degree of jitter, make automatic gain control equipment under the mobile channel environment, promote the path loss compensation and reduce the influence of noise simultaneously system.
In the mobile channel environment, received signal intensity can be subjected to the double influence 200 of path loss 210 and Doppler effect simultaneously, and signal strength signal intensity is subjected to Doppler effect its trough 201,202,203 and 204 shown in Fig. 2 intensity curves 200.Expect that desirable automatic gain controller can compensate because of the signal strength signal intensity of path loss and can ignore Doppler effect again simultaneously.In Fig. 2, oblique line 240 is depicted as the The perfect Gain curve of response path loss, when the big gain curve of loop gain as 230, the path loss compensation speed is fast, gain is subjected to the Doppler effect influence easily, and shake is its crest 231,232,233 and 234 shown in Fig. 2 gain curve 230 comparatively acutely.The inventor observes, if loop gain is little, the path loss compensation speed is slow, and gain is not vulnerable to the Doppler effect influence, and shake comparatively relaxes shown in the gain curve 250 of Fig. 2 dotted line.
So, referring again to Fig. 3 A and Fig. 3 B, yield value is to carry out original automatic gain control according to the less cycle (being higher frequency of operation) in searching modes, make gain curve continue to produce the situation of change that rises and falls, in comparison, update cycle in the tracking pattern is prolonged (that is adopting lower frequency of operation) and is introduced jittering noise to reduce, and is aided with the adjustment mode that significantly gains and compensates the tracking path loss ability that reduces because of the prolongation update cycle.So, the tracking pattern is useful among the mobile reception environment, and gain is not vulnerable to Doppler effect influence, and shake comparatively relaxes, and can promote the path loss compensation and reduce the influence of noise to signal simultaneously.
In addition, for fixing reception environment, an embodiment of auto gain control method of the present invention allows yield value adjustment convergence for searching modes finishes the back according to original automatic gain control mode of carrying out.Shown in Fig. 3 D, in searching modes, twice switching of gain curve 300 experience promptly additionally set yield value twice in time point 311 and 312.After time point 312 has been done last switching, the accurate position 301 of the more approaching gain of the variation of gain curve 300, and continue to follow original automatic gain control mode trend convergence of carrying out.Shown in Fig. 3 D, gain curve 300 is changed into the yield value near the accurate position 301 of gain behind time point 312.
Moreover other embodiment of auto gain control method of the present invention comprises searching modes, and optionally according to reception environment and actual situation, for example mobile environment whether at a high speed or low speed, and whether decision further carries out the tracking pattern.
Please refer to Fig. 4 A, it illustrates the flow chart according to an embodiment of auto gain control method of the present invention.This embodiment illustrates the step of above-mentioned searching modes, can be applicable in the automatic gain control unit of a receiving terminal for example, to control a yield value of a received signal, to accelerate the speed of gain convergence.In Fig. 4 A, step S410 and S420 represent: be subjected to automatic gain control and controlled while at yield value, detect at least one characteristic value of the time dependent relation of yield value, for example at least one local maximum of yield value and at least one local minimum.In step S410, local maximum or minimum value when the searching yield value is adjusted, if after finding one of them, in step S420, judge whether to find at least one local maximum and at least one local minimum, if not, then continue execution in step S410, till finding at least one local maximum and at least one local minimum.Step S430 according to detected characteristic value, as at least one local maximum and at least one local minimum, determines a switching value and set yield value according to this, for example is switching value or based on other numerical value of switching value gained with gain value settings.Shown in step S435, set yield value at every turn after, must wait for a period of time, come into force with the numerical value of guaranteeing switching point.Shown in step S440, step S410 to S430 can carry out one or many.If no longer design is calculated switching value to set yield value, then can set yield value the last time after, finish searching modes.The above embodiments can obtain the gain controlling result shown in Fig. 3 D applicable to fixing reception environment.
In addition, Fig. 4 B illustrates the flow chart according to another embodiment of auto gain control method of the present invention.In this embodiment, the searching modes of square S400 representative shown in the flow chart of Fig. 4 A after searching modes, enters a tracking pattern.This embodiment can obtain the gain controlling result shown in Fig. 3 A or Fig. 3 B applicable to mobile reception environment.Square S460 in the tracking pattern, periodically adjusts the size of yield value according to the comparative result of the intensity estimated value of received signal and preset signals intensity with decision or remains unchanged.Yield value in the tracking pattern controlled cycle greater than the cycle of the system frequency of communication system.Also furtherly, yield value in the tracking pattern controlled cycle greater than yield value controlled cycle of yield value when not entering the tracking pattern.For example, under the application mobile environment or under wired communication environment, as using orthogonal frequency division multiplexi (Orthogonal Frequency Division Multiplexing, OFDM) communication system, then above-mentioned yield value in the tracking pattern controlled cycle greater than the time span of symbol sign indicating number.
In addition, Fig. 4 C illustrates the flow chart according to another embodiment of auto gain control method of the present invention.Embodiment different be of this embodiment, after searching modes,, judge whether to enter the tracking pattern through step 450 with Fig. 4 B.If the beginning is carried out the tracking pattern of square S460 representative; If not, then carry out other control or end.The effect of step 450 herein is for reaching optimization, and make the embodiment of the method can be applicable to different reception environments, the communication system of carrying out this embodiment can be judged whether to enter the tracking pattern in step S450 according to demand or actual conditions, or sets parameter wherein.And the criterion of judging, for example be: whether present received signal derives from mobile environment; Or mobile environment whether at a high speed (as vehicle of bullet train that travels or highway); Or whether the signal strength signal intensity of received signal reaches a threshold value.So, according to this embodiment, can reach the optimization effect of automatic gain control in response to different situations.
Then, in the foregoing description, the different execution modes of the step of the searching modes and the pattern of tracking are described as follows.
In Fig. 4 A, step S410 and S420 represent: be subjected to automatic gain control and controlled while at yield value, detect at least one characteristic value of the time dependent relation of yield value.Characteristic value is at least one local maximum and at least one local minimum of aforesaid gain curve for example, characteristic value can also be represented the numerical value of yield value variation characteristic for other in addition, for example corresponds to the point of inflexion on the gain curve or the yield value yield value when changing second-order differential to the time and being zero.Below illustrate with the example of enumerating several characteristic value definition.
Be example as the characteristic value of change in gain at first with local maximum and minimum value.Fig. 5 A is shown in the searching modes of auto gain control method of the present invention, and a yield value is according to the situation of time dependent relation, and wherein transverse axis is represented the time, and the longitudinal axis is represented the numerical value of yield value.Be shown in obtained a plurality of yield values in a time interval among Fig. 5 A, can be considered as in fact a gain curve 500 through sampling and a plurality of yield values, and straight line 501 represent accurate of the gain of target, wherein, the pairing yield value of time point n is called y[n].
First example is in a time interval, compares a plurality of yield values of the time dependent relation of yield value, to determine local maximum and minimum value.For example, between the time point 7 to 11 of Fig. 5 A, yield value has following relation to occur: y[7]＜y[8]＜y[9]＞y[10]＞y[11], yield value y[9 then] promptly can be considered a local maximum.In addition, between time point 17 to 21, yield value has following relation to occur: y[17]＞y[18]＞y[19]＜y[20]＜y[21], yield value y[19 then] promptly can be considered a local minimum.The gain curve sampling frequency can be more than or equal to the digital quantizer sampling frequency.
At first in a time interval, the single order differential of seeking change in gain is essentially zero the pairing yield value of time point to second example, and this yield value can be considered the stationary point (stationarypoint) of gain curve 500 in fact.Then, utilize the gain values magnitude relationship of these stationary point correspondences to determine the yield value of the gained that previous step is rapid to be local maximum or minimum value.The single order differential of the gain curve 500 of the curve 510 schematic diagram 5A of Fig. 5 B is for example sought gain single order differential and is at least one group of zero time point, and for example the time point shown in Fig. 5 B is respectively: t 1, t 2, t 3, t 4According to t 1, t 2, t 3, t 4, the yield value that corresponds to gain curve is respectively: y[t 1], y[t 2], y[t 3], y[t 4], and the numerical relation of these yield values of comparison.Because y[t 1]＞y[t 2], y[t 2]＜y[t 3], y[t 3]＞y[t 4], then can judge y[t 1] and y[t 3] (equal y[9 approximately respectively], y[29]) be local maximum, y[t 2] and y[t 4] (equal y[19 approximately respectively], y[39]) be local minimum.
The 3rd example is to use the way of second example, and different is, further obtains the second-order differential of gain curve 500, and to utilize the single order differential be zero time point t 1, t 2, t 3, t 4, whether be plus or minus according to the numerical value of the second-order differential of correspondence, judge whether the pairing yield value of these time points is local minimum or maximum.Because this is the basic application of calculus principle, so do not repeat them here.
Except the characteristic value as change in gain with local maximum and minimum value, the pairing yield value of time point the when second-order differential that the characteristic value of change in gain may be defined as change in gain is zero.If with the viewpoint of gain curve, this characteristic value promptly corresponds to the point of inflexion (inflection point) of gain curve 500.Please refer to Fig. 6, the variation relation of the second-order differential of the gain curve 500 among the curve 520 schematic diagram 5A.Seek the gain second-order differential and be 0 time point, more at least, the time point among Fig. 6: t ' for example 1, t ' 2, t ' 3, t ' 4, according to t ' 1, t ' 2, t ' 3, t ' 4-, the yield value that corresponds to gain curve 500 is designated as y[t ' respectively 1], y[t ' 2], y[t ' 3], y[t ' 4].Because these yield values can be considered the accurate position of target gain in fact, so, as long as obtain an above-mentioned yield value at least, as y[t ' 1], can be set at new yield value for step S 430.
In step S 430, switching value is to get according at least one characteristic value, different execution modes can be arranged according to the definition of characteristic value, its purpose is to find out a switching value and can determines how to set at present the yield value in variation according to this making it to switch to a new yield value, with near the accurate position of target gain.For example, characteristic value is to be definition with at least one local maximum and at least one local minimum, but the summation of the weighting of these local maximums and minimum value then can be tried to achieve a switching value, as mean value.In addition, the yield value (can be considered the point of inflexion of gain curve) that if characteristic value is defined as the second-order differential of the time dependent relation of gain when being zero, except can directly setting this increment for the switching value, other algorithm of also can arranging in pairs or groups, the mean value that for example calculates a plurality of yield values that correspond to the point of inflexion is as switching value, and set yield value according to this, to increase accuracy.In addition, switching point also can local maximum and minimum value decide in addition according to the element characteristic of the automatic gain control unit in the receiving terminal.Element characteristic for example refers to the input signal power of a variable gain amplifier, the relation of the relation of output signal power and gain and input signal and gain.
Generally speaking, in the searching modes, detect the step of one or more characteristic value at least, be in order to estimating the kenel that present yield value changes, and then in step S430, set yield value according to this.So any characteristic value that can reflect this change in gain kenel substantially can be in order to implementation step S410 and S420.The gain control signal of variable gain amplifying unit for example, its change with yield value is relevant, so, detect at least one characteristic value of this gain control signal, also can be considered the embodiment of the equalization of step S410 and S420.
When stating the method for embodiment on the implementation, if in searching modes, only carry out comprise step S410 to S430 step once after, promptly enter the tracking pattern, but omit step S440 then.In addition, in other embodiments, shown in Fig. 3 B, but the duplicate detection gain curve changes and calculate the switching value position at least once, makes gain switching point numerical value progressively near desirable accurate position.In addition, when each setting yield value is the numerical value of switching point, must wait for a period of time, come into force with the numerical value of guaranteeing switching point, shown in step S 435.In addition, the time of this wait can be set a reasonable time by the element characteristic of the automatic gain control unit in the receiving terminal when implementing, TUA 6034 tuners of company of Infineon (Infineon) for example, and the stand-by period can be set at 110ms.
Step S 460 shown in Fig. 4 B and Fig. 4 C enters after the tracking pattern, the comparative result of periodic test received signal intensity estimated value and preset signals intensity, and the direction that decision is adjusted is increase amplitude A, minimizing amplitude A, or remains unchanged.For example, A is the gain delta transfer function, compares device output result's function A () for signal strength signal intensity.If the gain delta transfer function is shown in Fig. 7 A, then the embodiment of step S 460 is shown in the flow chart of Fig. 4 D.Step S510 and S520 are one-period in order to keep gain, if the time of keeping arrival during one-period, shown in step S530, is checked the relation of a comparative result Err and a threshold value THD.If the absolute value of comparative result Err is not more than threshold value THD, then yield value remains unchanged, and promptly gain delta is 0, so method is got back to execution in step S510.If the absolute value of comparative result Err greater than preset signals intensity, then shown in step S 533, reduces yield value greater than the intensity estimated value of threshold value THD and received signal, promptly gain delta is negative value-A.If the absolute value of the big Err of comparative result less than preset signals intensity, then shown in step S535, increases yield value greater than the intensity estimated value of threshold value THD and received signal, promptly gain delta is on the occasion of+A.As for gain delta+A or-variation pattern of A then decides with gain delta transfer function A (), as Fig. 7 A, comparative result Err between threshold value THD and another threshold value XLIMIT the time, gain delta A is SLOPE* (Err-THD), wherein SLOPE represents the slope of line segment; As comparative result Err during greater than XLIMIT, then gain delta A is a numerical value YLIMIT.
So, can application parameter THD, SLOPE, XLIMIT and YLIMIT defined a gain delta transfer function indicatrix.Fig. 7 B and Fig. 7 C are other two examples of gain delta transfer function, gain delta transformation curve 710 and 720, and they each have different threshold value T1 and T2.When comparative result during greater than threshold value, gain delta+A each has different variations.For gain delta transformation curve 710, when comparative result during greater than T1, gain delta+A is fixed numeric values YLIMIT.For gain delta transformation curve 720, when comparative result during greater than T2, gain delta+A is can be different with the change of comparative result.Thus, in step S460, can descend low noise to the influence of system, to select suitable update cycle and gain delta transfer function, to reduce jittering noise and compensatory tracking path loss ability with high-speed mobile.
Below disclose several embodiment according to an automatic gain control equipment of the present invention, wherein, these embodiment can be in order to carry out the embodiment of above-mentioned auto gain control method.
Please refer to an embodiment of the photograph automatic gain control equipment of the present invention of Fig. 8 A, be used to a yield value of control one received signal in the communication system, so that the signal after the gain closes the requirement of the signal strength signal intensity of symbol communication system.Automatic gain control equipment 800 comprises a variable gain amplifying unit 810, an analog-digital converter 820, a detecting unit 830 and a control unit 840A.Variable gain amplifying unit 810 amplifies received signal Si to produce one first signal So in order to the yield value according to an analog gain control signal Cga representative.Analog-digital converter 820 is in order to produce digital signal Sd according to the first signal So.Detecting unit 830 in order to a foundation digital signal Sd and an order normal bit signal T, produces a gain signal Sg and a comparison signal Sc.Control unit 840A produces above-mentioned analog gain control signal Cga in order to foundation gain signal Sg, and wherein, the yield value that variable gain amplifier 810 amplifies received signal Si is to adjust according to analog gain control signal Cga.
When control unit 840A operates in a searching modes, after at least one characteristic value that control unit 840A in the time dependent pass of the numerical value that detects gain signal Sg is, determine a switching value according to this at least one characteristic value, and set analog gain control signal Cga and with representative yield value is switched to a new yield value, this yield value can calculate the numerical value that gets for switching value or according to switching value.
The embodiment of above automatic gain control equipment can carry out the embodiment of above-mentioned auto gain control method, is particularly useful for fixedly in the reception environment.But variable gain amplifying unit 810 for example comprises a variable gain amplifier or gain-programmed amplifier.Control unit 840A for example is but that the programmable circuit is as a microprocessor, microcontroller, digital signal processor, field domain programmed logic gate array or other logical circuit.In searching modes, control unit 840A for example can be by sequencing implementing the method among Fig. 4 A, or the hardware circuit mode is to implement.In addition, in searching modes, determine analog gain control signal Cga according to gain signal Sg when control unit 840A is initial; When yield value carries out this gain adjustment, control unit 840A detects at least one characteristic value of the numerical value change of gain signal Sg, after detecting this at least one characteristic value, control unit 840A is in addition according to this at least one characteristic value decision switching value, with decision analog gain control signal Cga.
When implementing, also can make control unit 840A set two or more switching values.When control unit 840A sets last switching value, promptly do not change analog gain control signal Cga after the numerical value of switching point comes into force, control unit 840A is once more according to the source of gain signal Sg as decision analog gain control signal Cga, as the situation of yield value variation between the time point 311 to 312 of Fig. 3 D; When control unit 840A again at least one characteristic value of the numerical value change that detects gain signal Sg, after for example being local maximum and local minimum, control unit 840A is according to the switching value decision analog gain control signal Cga that is this time determined, shown in the time point among Fig. 3 D 312, so that yield value is little of the condition of choosing next switching point more near the accurate position of a target gain of order normal bit signal T representative as the difference with the pairing comparison signal representative of the more last switching point of the difference of comparison signal representative.In addition, switching value also as above-mentioned be according at least one characteristic value, or its weighted sum or mean value calculate.Moreover, the element characteristic of variable gain amplifying unit 810, as the pass of input/output signal power and gain is and the relation of input signal and gain can reflect the trend and the speed of gain convergence, so can consider that when design the said elements pass be to determine the suitable weight or the ratio of calculating.
Please refer to Fig. 9 A and Fig. 9 B, control unit 900A and 900B implement the circuit block diagram of the embodiment of the control unit 840A among Fig. 8 A respectively.In Fig. 9 A, control unit 900A gain acceptance in signal Sg, and produce analog gain control signal Cga according to this.Control unit 900A comprises a controller 910, switching value decision unit 930A, a gain storage element 970 and a digital analog converter 990.
Digital analog converter 990 is accepted digital gain control signal Cgd, converts analog gain control signal Cga to.
Switching value determines the digital gain control signal Cgd that unit 930A gain acceptance in storage element 970 is exported, and detects the local maximum and the minimum value of change in gain according to this, calculates switching value to produce gain switching signal Sf.
Controller 910 gain acceptance in signal Sg, gain switching signal Sf, running as the searching modes of automatic gain control equipment among the above-mentioned embodiment, controller 910 is taken the source as digital gain control signal Cgd generation of above-mentioned signal Sg and Sf, thus control variable gain amplifying unit 810.In searching modes, controller 910 is set digital gain control signal Cgd yield value is switched to new yield value according to gain switching signal Sf when foundation gain signal Sg adjusts yield value.
Switching value in Fig. 9 A decision unit 930A detects at least one local maximum and at least one local minimum as characteristic value.Switching value decision unit 930A comprises a maximum detection unit 933, minimum value detecting unit 935 and a ranking operation device 931, in order to produce gain switching signal Sf.This example can be in order to implementing shown in Fig. 5 A, above-mentionedly utilizes the comparison between a plurality of yield values in the time interval or the impartial numerical value to decide local maximum and minimum value.For example, digital gain control signal Cgd can be considered as the variation of yield value in fact, maximum detection unit 933 and minimum value detecting unit 935 receive a plurality of yield values by digital gain control signal Cgd representative between the time, tranmittance also stores respectively to measure local maximum and minimum value than their relation, after at least one local maximum and at least one local minimum obtain, export ranking operation device 931 again to calculate switching value and to produce gain switching signal Sf according to this.Controller 910 be subjected to the gaining notice of switching signal Sf, the source that makes digital gain control signal Cgd produce switches to gain switching signal Sf from above-mentioned gain signal Sg, thus the yield value of control variable gain amplifying unit 810.Following at fixing reception environment, after can implementing controller 910 and waiting for that these new yield values come into force, the source that makes digital gain control signal Cgd produce reverts to gain signal Sg, so can draw the gain controlling result as Fig. 3 D.
In addition, switching value decision unit 930A also can utilize the yield value variation relation in order to enforcement shown in Fig. 5 B, and utilizes its single order differential or even the little example with decision local maximum and local minimum of second order.When real the work, switching value decision unit 930A also can set up single order differentiator or second-order differential device.
In addition, Fig. 9 B is depicted as another embodiment of control unit 840, and the control unit 900A difference shown in itself and Fig. 9 A is that the switching value decision unit 930B of the control unit 900B among Fig. 9 B detects the second-order differential of time dependent relation of at least one yield value as characteristic value.So, can be in order to implement characteristic value and switching point deciding means as shown in Figure 6.Switching value decision unit 930B for example comprises a second-order differential device 936, switching value retrieval control unit 938 and a buffer 939.Second-order differential device 936 receives digital gain control signal Cgd, and the numerical value of change in gain is carried out the second-order differential signal processing.It is zero time point and output signal that switching value retrieval control unit 938 detects second-order differentials, and control buffer 939 stores corresponding gain values this moment, and and then produce gain switching signal Sf, with notification controller 910.So, the source that controller 910 makes digital gain control signal Cgd produce switches to gain switching signal Sf from above-mentioned gain signal Sg, and this is similar to above-mentioned controller 910 function modes, so repeat no more.
Please refer to Fig. 8 B, it is another embodiment according to automatic gain control equipment of the present invention.The difference of embodiment shown in this embodiment and Fig. 8 A is: the control unit 840B of Fig. 8 B automatic gain control equipment produces above-mentioned analog gain control signal Cga in order to foundation gain signal Sg and comparison signal Sc.The control unit 840B of this embodiment also has the tracking pattern except implementing the searching modes, so applicable in the mobile reception environment.So, this embodiment can implement the embodiment of the auto gain control method shown in Fig. 4 B or Fig. 4 C.
In the tracking pattern, whether control unit 840B periodically adjusts analog gain control signal Cga according to comparison signal Sc with decision increases yield value, reduce or remain unchanged with representative.Yield value in the tracking pattern controlled cycle greater than yield value controlled cycle in searching modes.
In the tracking pattern, control unit 840B for example can be with reference to as the gain delta of Fig. 7 A, Fig. 7 B or Fig. 7 C and the relation of comparative result, to adjust analog gain control signal Cga.In other embodiments, control unit 840B the relation of comparison signal Sc and analog gain control signal Cga can be embodied as a functional relation with sequencing mode or hardware circuit mode to be implemented among the control unit 840B.In addition, in the different execution modes of control unit 840B, also can additionally add internal memory (not illustrating), with the signal that helps control unit 840 to store to be read and the data in the processing procedure, or the numerical value of gain control signal Cga.Certainly, internal memory is built in control unit 840B in also can being designed to.
In addition, also available other circuit element of control unit 840B is implemented.See also the embodiment of Fig. 9 C illustrate into control unit 840B.In Fig. 9 C, control unit 900C gain acceptance in signal Sg and comparison signal Sc, and produce analog gain control signal Cga according to this.Control unit 900C comprises a controller 910, switching value decision unit 930, a gain tracing unit 940A, gain storage element 970 and digital analog converter 990.With respect to the control unit shown in Fig. 9 A or Fig. 9 B, control unit 900C has also comprised gain tracing unit 940A to realize the tracking pattern, in the tracking pattern, and the gain trace signals S t of controller 910 receiving gain tracing unit 940A.
Switching value decision unit 930 is in order to realize searching modes, for example to be switching value decision unit 930A or 930B.
Gain tracing unit 940A accepts digital gain control signal Cgd and comparison signal Sc, to produce gain trace signals St.
Controller 910 gain acceptance in signal Sg, gain switching signal Sf and gain trace signals St, as the searching modes of automatic gain control equipment among the above-mentioned embodiment and the running of the pattern of tracking, controller 910 is taken the source as digital gain control signal Cgd generation of above-mentioned signal Sg, Sf and St, thus control variable gain amplifying unit 810.In searching modes, controller 910 is set digital gain control signal Cgd according to gain switching signal Sf.In the tracking pattern, controller 910 is adjusted digital gain control signal Cgd according to gain trace signals St.In an example, controller 910 comprises a multiplexer and has decision circuitry to control multiplexer to select to use one of above-mentioned signal Sg, Sf and St.When implementing, also can make controller 910 in searching modes, do twice or above change action, in the example that adopts two switching points, the decision circuitry in the controller 910 will be with following selective sequential signal Sg, Sf, Sg, Sf and St.In addition, controller 910 can also use microprocessor, microcontroller or other logical circuit to implement.
Refer again to Fig. 9 C, the embodiment of gain tracing unit 940A comprises a tracking value generator 950A, a latch unit 959 and one-period property pulse generator 961.Gain tracing unit 940A periodically according to comparison signal Sc to produce gain trace signals St.So, in the tracking pattern, output in order to the circuit that produces a gain delta transfer function offers a holder, for example latch unit 959, and periodically produce the output of frequency with the control latch unit by a pulse generator 961, this trace signals S t that periodically gains is that to make yield value controlled cycle in the tracking pattern be greater than yield value controlled cycle in searching modes.
In Fig. 9 C, tracking value generator 950A comprises that a function generating circuit 951a, produces arithmetic element 952, an adder 953, a subtracter 955, a multiplexer 957 of absolute value.Arithmetic element 952 is the absolute value Sca in order to the comparative result of obtaining comparison signal Sc representative.And function generating circuit 951a in order to according to the absolute value Sca of this comparative result as input, realize the output of a gain delta transfer function B (); For example, gain delta transfer function B () can be considered first of gain delta transfer function A () among Fig. 7 A, Fig. 7 B or Fig. 7 C and resembles the pairing function in boundary, gain delta transfer function B () corresponding on the occasion of input, have on the occasion of output.Multiplexer 957 has three tunnel input and one tunnel control or judges input, for example is Sc.When Sc is timing greater than a threshold value THD and Sc, multiplexer 957 is selected subtracter 955 outputs of Third Roads, that is the digital gain control signal Cgd of the last time of gain storage element 970 outputs cuts the result of gain delta transfer function 951a output.When Sc greater than threshold value THD and Sc when negative, multiplexer 957 is selected the output of the adder 953 of the first via, that is the digital gain control signal Cgd of the last time of gain storage element 970 outputs adds the result of gain delta transfer function 951a output.Remaining situation, multiplexer 957 are selected 970 outputs of the second tunnel gain storage element.
In addition, another example of tracking value generator 950A please refer to the embodiment of Fig. 9 D, and the difference of this embodiment and Fig. 9 C only is that tracking value generator 950A changes tracking value generator 950B into.Tracking value generator 950B comprises a function generating circuit 951b and adder 953.Function generating circuit 951b as input, realizes the output of a gain delta transfer function A () in order to the comparative result of foundation comparison signal S c.For example, the gain delta transfer function A () shown in Fig. 7 A, Fig. 7 B or Fig. 7 C.The last digital gain control signal Cgd of adder 953 outputs adds the result of gain delta transfer function 951b output.According to the size of the comparative result of comparison signal, function generating circuit 951b is for example according to the gain delta transfer function A () shown in Fig. 7 A, Fig. 7 B or Fig. 7 C, output on the occasion of the result or zero of A () of result, negative value of A ().And above-mentioned function generating circuit 951a or 951b are can be with tabling look-up or calculation mode realizes with hardware.
As for an execution mode of detecting unit 830, as shown in Figure 8, detecting unit 830 comprises: a power detector (power detector) 831, one comparator 833 and a loop filter (loop filter) 835.Power detector 830 is in order to the average power of foundation digital signal Sd decision digital signal Sd.Comparator 833 in order to average power and the order normal bit signal of comparative figures signal Sd, produces comparison signal Sc.Loop filter 835 produces gain signal Sg in order to foundation comparison signal Sc.In addition, in other embodiments, detecting unit 830 can be implemented with the various integration of different power detectors, peak detector, comparator and loop filter or the mode of combination.In addition, the detecting unit among Fig. 8 A or Fig. 8 B 830 also can be considered a main control unit with its control unit and makes and integrating or other modes are implemented.
For example, in other embodiments, the detecting unit 830 of Fig. 8 A or Fig. 8 B can be combined into a control unit with its control unit, and example is with as shown in figure 10 control unit 1010, and it is to implement with treatment circuit, digital signal processor or the logical circuit of programmable.In addition, analog-digital converter 820 and control unit 1010 can use the microcontroller of built-in analog-digital converter or digital signal processor with real work.
Moreover, below be example with gain curve figure and the automatic gain control equipment 1000 of Figure 11 A, the proper proportion that illustrates searching modes in the foregoing description measures mode and switching point account form.Utilize automatic gain control equipment 1000, can see through the situation that measures the time dependent relation of gain, or the variation of gain curve, the proper proportion that switching value is calculated obtained.At first, utilize control unit 1010 to observe the accurate position of long-time gain convergence, be set at the accurate position of The perfect Gain.The accurate position 1101 of the The perfect Gain of the gain curve 1100 shown in Figure 11 A.Then, a maximum MAX and the minimum value MIN of record gain curve respectively with the difference D of accurate of The perfect Gain MaxWith D Min, as arrow among Figure 11 A 1110 and 1115 represented sizes values or arrow 1130 among Figure 11 B and 1135 represented sizes values.Proper proportion R is set at R=D Min/ (D Max+ D Min).
So, control unit 840 calculates switching value according to this proper proportion R, and illustrates with Figure 11 A and Figure 11 B.If maximum occurs prior to minimum value, shown in Figure 11 A, then switching value can be set at MAXR+MIN (1-R).If minimum value occurs prior to maximum, shown in Figure 11 B, then switching value can be set at MINR+MAX (1-R).
In addition, the calcspar of another embodiment of the automatic gain control equipment of the present invention that please refer to Figure 12 and illustrated.Automatic gain control equipment 1200 can also be implemented the embodiment of auto gain control method of the present invention, and the embodiment among aforesaid Fig. 8 different be in: utilize power discriminator (discriminator) 1210 to reach effect, to produce comparison signal Sc as power detector among Fig. 8 831 and comparator 833.In an example, power discriminator 1210 comprises power detector 831 and comparator 833.In addition, automatic gain control equipment 1200 also comprises a control unit 1220.Control unit 1220 is different from aforesaid control unit 900, is to comprise a loop filter 1230, a gain detector 1250, a gain tracker 1270 and a controller 1290.Loop filter 1230 is the loop filter 835 among Fig. 8 for example.Power discriminator 1210 receives analog-digital converter sampling back signal and produces comparison signal Sc.Comparison signal Sc inputs to loop filter 1230 and gain tracker 1270.Gain curve is produced with the gain trace signals St of gain tracker generation based on the gain signal Sg of loop filter 1230 outputs, the output signal Sl of gain detector by controller 1290.Gain detector 1250 is switching value decision unit 930 for example.In another example, gain detector 1250 can be embodied as gain detector 1250 and seek and the recording feature values, for example Ju Bu maximum and minimum value, and the calculating of switching point is judged and is calculated by the controller 1290 with calculation function.Gain tracker 1270 for example is gain tracing unit 940A or 940B.Controller 1290 for example is processor or other logical circuit of programmable, be gain acceptance in signal Sg, output signal Sl and gain trace signals St, as the searching modes of automatic gain control equipment among the above-mentioned embodiment and the running of the pattern of tracking, controller 1290 is taken the source as digital gain control signal Cg (or analog gain control signal Cga) generation of above-mentioned signal Sg, Sl and St, thus control variable gain amplifying unit 810.
In addition,, be applicable among the embodiment of fixing reception environment one based on the automatic gain control equipment 1200 of Figure 12, the tracker 1270 that can embodiment gains, and gain detector 1250 is for example with switching value decision unit 930.
For above-mentioned Fig. 9 A to Fig. 9 D and embodiment illustrated in fig. 12 in controller (as 910 or 1290), in other example, the gain storage element 970 can be incorporated into controller in.In addition, in other example, for implementing the embodiment of the auto gain control method shown in Fig. 4 C, controller can be accepted situation or the parameter of signal to learn reception environment from communication system in addition, with optionally according to reception environment and actual situation, for example mobile environment whether at a high speed or low speed, and whether decision further carries out the tracking pattern.
In addition, based on Fig. 9 A to Fig. 9 D or embodiment shown in Figure 12, in other example, digital analog converter 990 can be independent of beyond the control unit or be included in the control unit.
In addition, based on Fig. 8 A, Fig. 8 B, Figure 10 or embodiment shown in Figure 12, in other example, variable gain amplifying unit 810 be change with other can accept digital signal (as digital gain control signal Cgd) but with the variable gain amplifying unit or the program variable gain amplifying unit of ride gain value, so can use digital analog converter 990 to produce analog gain control signal Cga.But variable or program gain amplifying unit for example sees through digital interface such as serial peripheral interface (SPI) or an integrated circuit agreement (I2C) with ride gain.
The above embodiment of the present invention has disclosed auto gain control method and device.It realizes searching modes, in the process of gain convergence, determines at least one switching value, to shorten the gain convergence time; In addition, other embodiment also further realizes the tracking pattern, promotes can reduce the influence of noise to system when path loss compensates under mobile reception environment.So the gain convergence rate under the various reception environments is improved, signal receives to imitate and also can improve.
In sum, though the present invention discloses as above with embodiment, so it is not in order to limit the present invention.The persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when doing various also moving and retouchings.Therefore, protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.

Claims (33)

1. auto gain control method, this method comprises:
(a) in a searching modes, one yield value of one received signal is gained when adjusting, situation of change according to a gain curve of this yield value, change this yield value in addition at least once so that this yield value tends to the accurate position of a target gain, wherein, the step that changes this yield value in addition comprises:
Detect at least one characteristic point of this gain curve;
According to detected this at least one characteristic point, determine a switching value, this switching value be with so that this yield value near the accurate position of this target gain; And
According to this switching value, set this yield value and be a new gain value and coming into force of making;
The step of wherein, this detection, this decision and this setting is performed once at least.
2. auto gain control method as claimed in claim 1 is characterized in that, in the step of this detection of this step (a), at least one characteristic point of this of this gain curve comprises: at least one local maximum of this gain curve and at least one local minimum; This switching value is that Decision is calmly according at least one local minimum of this at least one local maximum and this.
3. auto gain control method as claimed in claim 2, it is characterized in that, in the step of this detection of this step (a), at least one local maximum of this gain curve and at least one local minimum be dependent on this obtained in time interval gain curve at least two vicinities the stationary point and determine.
4. auto gain control method as claimed in claim 1, it is characterized in that, in the step of this detection of this step (a), at least one characteristic point of this of this gain curve comprises: at least one point of inflexion of this gain curve, one point of inflexion of this gain curve correspond to this gain curve to the second-order differential of time be on this gain curve of zero a bit, this switching value determines according to the yield value of pairing this gain curve of this at least one point of inflexion.
5. auto gain control method as claimed in claim 1 is characterized in that, this method also comprises:
(b) after this step of setting this yield value is performed for the last time, enter a tracking pattern, in this tracking pattern, periodically judge whether to adjust this yield value, wherein, this yield value controlled cycle in this tracking pattern is carried out the cycle that this gain is adjusted greater than this yield value in this searching modes.
6. auto gain control method as claimed in claim 5 is characterized in that, this step (b) also comprises:
After this step of setting this yield value was performed for the last time, if this received signal is to move when receiving in the reception environment in one, the beginning entered this tracking pattern.
7. auto gain control method as claimed in claim 5 is characterized in that, in this step (b), periodically adjusts this yield value or remaining unchanged of making according to the comparative result of the intensity estimated value of this received signal and a preset signals intensity with decision.
8. auto gain control method as claimed in claim 7 is characterized in that, in this step (b):
If the absolute value of this comparative result is not more than a threshold value, then this yield value remains unchanged;
If the absolute value of this comparative result greater than this preset signals intensity, then reduces this yield value greater than the intensity estimated value of this threshold value and this received signal;
If the absolute value of this comparative result less than this preset signals intensity, then increases this yield value greater than the intensity estimated value of this threshold value and this received signal.
9. an automatic gain control equipment is characterized in that, this device comprises:
One variable gain amplifying unit is in order to control a received signal to produce one first signal according to a yield value;
One analog-digital converter is in order to produce a digital signal according to this first signal; And
One main control unit, in order to produce a gain control signal according to this digital signal and an order normal bit, wherein, this yield value of this variable gain amplifier is to adjust according to this gain control signal;
Wherein, when this main control unit operates in a searching modes, this main control unit according at least one characteristic value of the time dependent relation of this yield value, changes this yield value at least once so that this yield value tends to the accurate position of a target gain in addition when this yield value gains adjustment.
10. automatic gain control equipment as claimed in claim 9, it is characterized in that, this main control unit detect this gain control signal the time dependent relation of numerical value at least one characteristic value with as this at least one characteristic value of the time dependent relation of this yield value determining a switching value, and according to this switching value with set this gain control signal with this yield value of other setting so that this yield value near the accurate position of this target gain.
11. automatic gain control equipment as claimed in claim 9 is characterized in that, this main control unit comprises:
One detecting unit in order to according to this digital signal and this order normal bit, produces a gain signal; And
One control unit is in order to produce this gain control signal according to this gain signal;
Wherein, when this control unit is when operating in this searching modes, this control unit according to this at least one characteristic value of the time dependent relation of this yield value, changes this yield value at least once so that this yield value tends to the accurate position of this target gain in addition when this yield value gains adjustment.
12. automatic gain control equipment as claimed in claim 11 is characterized in that, this detecting unit comprises:
One power detector is in order to determine the average power of this digital signal according to this digital signal;
One comparator in order to relatively this average power and this order normal bit, produces a comparison signal; And
One loop filter is in order to produce this gain signal according to this comparison signal.
13. automatic gain control equipment as claimed in claim 11, it is characterized in that, this control unit detect this gain control signal the time dependent relation of numerical value at least one characteristic value with as this at least one characteristic value of the time dependent relation of this yield value determining a switching value, and according to this switching value with set this gain control signal with this yield value of other setting so that this yield value near the accurate position of this target gain.
14. automatic gain control equipment as claimed in claim 11 is characterized in that, this control unit comprises:
One switching value decision unit according to this gain control signal, detects this at least one characteristic value of the time dependent relation of this gain signal, to obtain a switching value to produce a gain switching signal; And
One controller in order to accepting this gain signal, this gain switching signal, and produces this gain control signal according to this; Wherein, in this searching modes, this controller is set this gain control signal to set this yield value according to this gain switching signal.
15. automatic gain control equipment as claimed in claim 14 is characterized in that, this switching value decision unit comprises a differentiator.
16. automatic gain control equipment as claimed in claim 11 is characterized in that:
After last this yield value of setting in addition comes into force, this main control unit enters a tracking pattern, in this tracking pattern, this main control unit periodically judges whether to adjust this yield value, wherein, this yield value controlled cycle in this tracking pattern is carried out the cycle that this gain is adjusted greater than this yield value in this searching modes.
17. automatic gain control equipment as claimed in claim 16 is characterized in that, this control unit also comprises also and comprising:
One gain tracing unit, in this tracking pattern, according to this gain control signal and a comparison signal, periodically whether decision adjusts this gain control signal, to produce a gain trace signals;
Wherein, this detecting unit also produces this comparison signal according to this digital signal and this order normal bit signal; In this tracking pattern, this controller is also adjusted this gain control signal to set this yield value according to this gain trace signals.
18. automatic gain control equipment as claimed in claim 9 is characterized in that, this main control unit comprises:
One power discriminator in order to according to this digital signal and an order normal bit signal, produces a comparison signal; And
One control unit is in order to produce this gain control signal according to this comparison signal;
Wherein, when this control unit operates in this searching modes, this control unit according to this at least one characteristic value of the time dependent relation of this yield value, changes this yield value at least once so that this yield value tends to the accurate position of this target gain in addition when this yield value gains adjustment.
19. automatic gain control equipment as claimed in claim 18, it is characterized in that, this control unit detect this gain control signal the time dependent relation of numerical value at least one characteristic value with as this at least one characteristic value of the time dependent relation of this yield value determining a switching value, and according to this switching value with set this gain control signal with this yield value of other setting so that this yield value near the accurate position of this target gain.
20. automatic gain control equipment as claimed in claim 18 is characterized in that, this control unit comprises a loop filter, in order to produce a gain signal according to this comparison signal to obtain the gain curve of this gain.
21. automatic gain control equipment as claimed in claim 18 is characterized in that:
After last this yield value of setting in addition comes into force, this main control unit enters a tracking pattern, in this tracking pattern, this main control unit periodically judges whether to adjust this yield value, wherein, this yield value controlled cycle in this tracking pattern is carried out the cycle that this gain is adjusted greater than this yield value in this searching modes.
22. automatic gain control equipment as claimed in claim 21 is characterized in that this control unit also comprises:
One gain detecting unit according to this gain control signal, detects the local maximum and the minimum value of this gain signal gain curve, to obtain an output signal;
One gain tracing unit, in this tracking pattern, according to this gain control signal and this comparison signal, periodically whether decision adjusts this gain control signal, to produce a gain trace signals; And
One controller in order to accepting this gain signal, this output signal and this gain trace signals, and produces this gain control signal according to this; Wherein, in this searching modes, this controller is set this gain control signal to set this yield value according to this output signal; In this tracking pattern, this controller is adjusted this gain control signal according to this gain trace signals.
23. automatic gain control equipment as claimed in claim 9 is characterized in that also comprising:
One gain storage element is in order to store this gain control signal.
24. automatic gain control equipment as claimed in claim 9 is characterized in that also comprising:
One digital analog converter, in order to according to this gain control signal with produce one the simulation gain control signal.
25., it is characterized in that in searching modes, this at least one characteristic value comprises: at least one local maximum of the time dependent relation of this yield value and at least one local minimum as the described automatic gain control equipment of the arbitrary right request of claim 9 to 24.
26. automatic gain control equipment as claimed in claim 25, it is characterized in that this at least one local maximum and at least one local minimum are to go up contiguous and can make a gain curve of the correspondence of this yield value that the single order differential of time is essentially zero yield value and determine according at least two times of the time dependent relation of this yield value obtained in a time interval.
27. as claim 10,13,14,15,19 or 21 described automatic gain control equipments, it is characterized in that, in searching modes, this at least one characteristic value comprises: at least one local maximum of the time dependent relation of this yield value and at least one local minimum; This switching value this at least one local maximum of basis and the input/output signal power of this at least one local minimum and this variable gain amplifying unit and the relation of gain and the relation of input signal and gain determine.
28., it is characterized in that this at least one characteristic point comprises as the described automatic gain control equipment of claim 9 to 24: the second-order differential that makes the pairing gain curve of the time dependent relation of this yield value is at least one yield value of zero.
29. as claim 10,13,14,15,19 or 21 described automatic gain control equipments, it is characterized in that this at least one characteristic point comprises: the second-order differential that makes the pairing gain curve of the time dependent relation of this yield value is at least one yield value of zero; This switching value is that zero yield value determines according to this at least one this gain curve that makes to the second-order differential of time.
30. automatic gain control equipment as claimed in claim 9 is characterized in that:
After last this yield value of setting in addition comes into force, this main control unit enters a tracking pattern, in this tracking pattern, this main control unit periodically judges whether to adjust this yield value, wherein, this yield value controlled cycle in this tracking pattern is carried out the cycle that this gain is adjusted greater than this yield value in this searching modes.
31., it is characterized in that after last this yield value of setting in addition came into force, if this automatic gain control equipment is when one moves in the reception environment, the beginning entered this tracking pattern as claim 16,17,21,22 or 30 described automatic gain control equipments.
32. as claim 16,17,21,22 or 30 described automatic gain control equipments, it is characterized in that this main control unit is periodically adjusted this yield value or remaining unchanged of making according to the comparative result of the intensity estimated value of this received signal and a preset signals intensity with decision.
33. automatic gain control equipment as claimed in claim 32 is characterized in that:
If the absolute value of this comparative result is not more than a threshold value, this main control unit determines this yield value to remain unchanged;
If the absolute value of this comparative result greater than the intensity estimated value of this threshold value and this received signal greater than this preset signals intensity, this this yield value of main control unit decision reducing;
If less than this preset signals intensity, this main control unit decision increases this yield value greater than the intensity estimated value of this threshold value and this received signal for the absolute value of this comparative result.
CN200910137113.5A 2009-05-07 2009-05-07 Automatic gain control method and device Expired - Fee Related CN101882918B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200910137113.5A CN101882918B (en) 2009-05-07 2009-05-07 Automatic gain control method and device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN200910137113.5A CN101882918B (en) 2009-05-07 2009-05-07 Automatic gain control method and device

Publications (2)

Publication Number Publication Date
CN101882918A true CN101882918A (en) 2010-11-10
CN101882918B CN101882918B (en) 2014-01-08

Family

ID=43054835

Family Applications (1)

Application Number Title Priority Date Filing Date
CN200910137113.5A Expired - Fee Related CN101882918B (en) 2009-05-07 2009-05-07 Automatic gain control method and device

Country Status (1)

Country Link
CN (1) CN101882918B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102146943A (en) * 2011-03-22 2011-08-10 徐州重型机械有限公司 Motor pressure turn-off control system and crane applying same
CN104362993A (en) * 2014-11-17 2015-02-18 中环天仪股份有限公司 Automatic gain adjustment control method of liquid ultrasonic flow meter
CN105811975A (en) * 2014-12-30 2016-07-27 展讯通信（上海）有限公司 Quantification noise reducing method and device
CN105075289B (en) * 2013-03-13 2018-10-16 皇家飞利浦有限公司 Device and method for improving specific sound to the audibility of user
CN109828238A (en) * 2019-02-18 2019-05-31 航天南湖电子信息技术股份有限公司 A kind of timing/AGC device
CN110414287A (en) * 2019-07-26 2019-11-05 浙江大华技术股份有限公司 A kind of modulation depth method of adjustment and device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6843597B1 (en) * 2001-05-15 2005-01-18 Golden Bridge Technology Inc. Method and apparatus of a fast two-loop automatic gain control circuit
CN1790927A (en) * 2001-09-21 2006-06-21 三洋电机株式会社 Radio apparatus carrying out automatic gain control and gain control method
US7366490B2 (en) * 2004-11-02 2008-04-29 Northrop Grumman Corporation Automatic gain control with gain stepping and regulation
CN101335505A (en) * 2008-07-30 2008-12-31 络达科技股份有限公司 Gain control circuit of wireless receiver
US20090060102A1 (en) * 2007-09-04 2009-03-05 Freescale Semiconductor, Inc. Fast predictive automatic gain control for dynamic range reduction in wireless communication receiver

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6843597B1 (en) * 2001-05-15 2005-01-18 Golden Bridge Technology Inc. Method and apparatus of a fast two-loop automatic gain control circuit
CN1790927A (en) * 2001-09-21 2006-06-21 三洋电机株式会社 Radio apparatus carrying out automatic gain control and gain control method
US7366490B2 (en) * 2004-11-02 2008-04-29 Northrop Grumman Corporation Automatic gain control with gain stepping and regulation
US20090060102A1 (en) * 2007-09-04 2009-03-05 Freescale Semiconductor, Inc. Fast predictive automatic gain control for dynamic range reduction in wireless communication receiver
CN101335505A (en) * 2008-07-30 2008-12-31 络达科技股份有限公司 Gain control circuit of wireless receiver

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102146943A (en) * 2011-03-22 2011-08-10 徐州重型机械有限公司 Motor pressure turn-off control system and crane applying same
CN102146943B (en) * 2011-03-22 2013-04-10 徐州重型机械有限公司 Motor pressure turn-off control system and crane applying same
CN105075289B (en) * 2013-03-13 2018-10-16 皇家飞利浦有限公司 Device and method for improving specific sound to the audibility of user
CN104362993A (en) * 2014-11-17 2015-02-18 中环天仪股份有限公司 Automatic gain adjustment control method of liquid ultrasonic flow meter
CN105811975A (en) * 2014-12-30 2016-07-27 展讯通信（上海）有限公司 Quantification noise reducing method and device
CN105811975B (en) * 2014-12-30 2018-11-27 展讯通信（上海）有限公司 A kind of method and device reducing quantizing noise
CN109828238A (en) * 2019-02-18 2019-05-31 航天南湖电子信息技术股份有限公司 A kind of timing/AGC device
CN110414287A (en) * 2019-07-26 2019-11-05 浙江大华技术股份有限公司 A kind of modulation depth method of adjustment and device

Also Published As

Publication number Publication date
CN101882918B (en) 2014-01-08

Similar Documents

Publication Publication Date Title
CN101882918B (en) Automatic gain control method and device
EP2239844B1 (en) Automatic gain control method and apparatus
CN107086859B (en) Digital automatic gain control circuit for wireless communication receiver
US20080005629A1 (en) On-chip receiver eye finder circuit for high-speed serial link
CN101304265B (en) Method and apparatus for data reception
JP2012513703A (en) Channel estimation apparatus and method for mobile communication system
KR101790960B1 (en) Bluetooth smart signal receiving method and device using improved automatic gain control
US8126039B2 (en) Methods and apparatus for evaluating the eye margin of a communications device using a data eye monitor
JP2001069568A (en) Mobile phone
GB2319915A (en) Analogue to digital converter system
JPH0454043A (en) Reception data identification circuit
CN101295965B (en) Digital automatic gain control circuit apparatus
KR102268173B1 (en) Apparatus and method of adaptive equalization
US7274322B2 (en) Systems and methods for automatic gain control for multichannel receivers
JP4165238B2 (en) Path search circuit, method and program
CN112769458B (en) Power control method and device for power line communication
US7233615B1 (en) Timing correcting device and timing correcting method
CN117155745A (en) Analog quantized self-adaptive real time delay alignment device
CN111614585B (en) Adaptive equalization apparatus and method thereof
US7205841B2 (en) Automatic gain control with three states of operation
KR102243180B1 (en) An apparatus of adaptive equalization
CN116418496A (en) Single photon detection position calibration method, detector and quantum key distribution system
JP2004320104A (en) Device and method of measuring bit error rate
KR102582724B1 (en) Apparatus and method of adaptive equalization
KR102613262B1 (en) Apparatus and method of adaptive equalization

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140108