CN110365349A

CN110365349A - A kind of broadband receiver AAGC method and apparatus

Info

Publication number: CN110365349A
Application number: CN201810318551.0A
Authority: CN
Inventors: 陈嘉
Original assignee: Chengdu Dingqiao Communication Technology Co Ltd
Current assignee: Chengdu Dingqiao Communication Technology Co Ltd; TD Tech Chengdu Co Ltd
Priority date: 2018-04-11
Filing date: 2018-04-11
Publication date: 2019-10-22
Anticipated expiration: 2038-04-11
Also published as: CN110365349B

Abstract

This application discloses a kind of broadband receiver AAGC method, the intermediate frequency statistics power that the radio frequency in same measurement period is eated dishes without rice or wine after power and ADC is obtained, radio frequency is obtained and eats dishes without rice or wine the variation tendency of power；It is eated dishes without rice or wine the variation tendency of power according to radio frequency, determines the control starting value of RF AAGC；According to current radio frequency eat dishes without rice or wine power level, intermediate frequency statistics power level and ADC saturation threshold relationship, determine the control starting value of current IF AAGC；The calculating of uplink entire gain is carried out, RF AAGC and IF AAGC pad value is come into force, while in the compensation of numeric field setting AAGC pad value.Disclosed herein as well is a kind of broadband receivers to simulate AAGC device, it is characterized in that, can accurately be measured in large bandwidth/power bracket power of eating dishes without rice or wine using technical solution disclosed in the present application, and be greatly reduced receiver starts to control-discharges number, and has stronger antiblocking ability.

Description

A kind of broadband receiver AAGC method and apparatus

Technical field

This application involves field of communication technology, in particular to a kind of broadband receiver AAGC method and apparatus.

Background technique

In a communications system, the power of signal is because channel rapid fading, user's near-far interference, modulated signal peak-to-valley ratio, more The factors such as carrier wave superposition, environmental disturbances will lead to receiver received signal intensity rapid fluctuations, have great dynamic model It encloses.Thus, system generally takes AAGC (simulation automatic growth control) technology to absorb the part fluctuation of receiver signal, with drop The low dynamic range requirement to devices such as ADC (analog-digital converter).Generally, AAGC algorithm is by preset target level With the difference of both RSSI (received signal strength indicator) power levels after the ADC of period real-time statistics, to determine next week The direction of phase analog channel gain adjustment and step-length, to achieve the purpose that compress ADC front signal fluctuating range.

In the Chinese invention patent application application No. is 201180000313.1, propose a kind of by distinguishing after ADC Broadband RSSI and narrowband RSSI power are counted, to calculate eat dishes without rice or wine general power and base band jamming power, and is asked with two-stage target level Difference, the method for coming calculating simulation domain and numeric field amount of gain adjustment.

In the Chinese invention patent application application No. is 201110060404.6, another method is proposed: filtering in intermediate frequency The first intermediate-freuqncy signal intensity is counted before the input of wave device, and counts the second intermediate-freuqncy signal intensity after ADC output, and according in second Whether frequency signal strength is more than threshold value to adjudicate whether receive signal effective, if effectively according to the first intermediate-freuqncy signal intensity come It determines received signal strength, and then rf gain adjustment amount is calculated according to the intensity value and RF signal strength desired value, with Gain is set to control fast convergence.

In modern 4G LTE communication network, especially broadband private network system scene, for cost declining, dilatation, emergency communication, Networking flexibility etc. is many-sided to be considered, higher and higher for the bandwidth range requirement of base station receiver, in some low frequency segment limits On, booting frequency sweep in cooperation base station evades the function of interference frequency point automatically, and the filter bandwidht of radio frequency part currently becomes It is wide；But when designing the receiver in this broadband, the maximum challenge of one faced is exactly: big bandwidth may be introduced more Carrier wave out-of-band interference, especially under low-frequency range (1GHz or less) emergency communication scene of environment interference situation complexity, to product Block resistance requirement will be higher.

As shown in Fig. 1 left-half, traditional narrow receiver usually only focuses on the co-channel interference in carrier band, passes through division The network plannings network optimization means such as isolation strip or the planning of adjacent area frequency point, can farthest reduce the interference of introducing.

And specifically for the broadband receiver of low-frequency range emergency scene customization, when application, can not usually plan all side frequencys in advance Point can not predict environmental disturbances situation, even if there is frequency sweep function, interference may also irregular burst at any time, more situations Under, in filter band-outer (or in partial carrier wave band, outside partial carrier wave band) this interference meeting for blocking radio-frequency front-end of carrier band Often occur, as shown in Fig. 1 right half part.Under this application scenarios, traditional AAGC device often exists with algorithm Link gain calculates the design defect in distribution.

There are following technical problems for the prior art:

First, by taking the application for a patent for invention application No. is 201180000313.1 as an example, by broadband after ADC and Narrowband RSSI signal strength calculates AAGC adjust gain, and the insurmountable problem of the technology is: when blocking big signal and useful Signal averaging is fallen into midband jointly, and when ADC input being enabled to be more than saturation threshold, since ADC bit wide is limited, at this time after ADC The RSSI power of statistics can not accurate response eat dishes without rice or wine signal magnitude, therefore can not probably be calculated just to AAGC module True attenuation, so as to cause AAGC adjustment response lag, response speed decline, while the guarantor for being also unfavorable for ADC device itself Shield.

The first intermediate-freuqncy signal power statistic advanceed to likewise, application No. is 201110060404.6 patent applications Before frequency filter, after frequency mixer, it appears that avoid the limited problem of ADC, but it is still insurmountable be, if big eats dishes without rice or wine to do It disturbs signal and falls into radio-frequency front-end, obstruction interference can be equally generated to frequency mixer declines its linearity, so that useful signal be made to produce Raw distortion, reduces signal-to-noise ratio.

Second, for non-intermittent bursty interference lasting for a long time, current patented technology is also without explicitly inhibiting to calculate Method, when the interference burst period is shorter, the AAGC algorithm of high response speed can introduce instead largely start to control, release movement, cause Gain adjustment is frequent, influences the gain stabilization of receiver link.

Third, when there is carrier band external blocking, the way of general AAGC is to reduce analog link gain, and compression ADC enters Message number, brought consequence are, with interior useful signal itself also together by AAGC compression algorithm, especially have when obstruction is larger When smaller with signal, the useful signal intensity after starting to control is compressed into far from ADC saturation threshold, is not made full use of instead The dynamic range of ADC.

Summary of the invention

This application provides a kind of broadband receiver AAGC method and apparatus, in large bandwidth/power bracket to sky Mouthful power is accurately measured, and be greatly reduced that receiver recorded starts to control-discharge number, and has stronger antiblocking Ability.

This application provides a kind of broadband receivers to simulate automatic growth control AAGC method, comprising:

A, the intermediate frequency statistics power that the radio frequency in same measurement period is eated dishes without rice or wine after power and ADC is obtained, by current statistic The radio frequency in period eats dishes without rice or wine power compared with the statistical value of a upper periodic recording, obtains radio frequency and eats dishes without rice or wine the variation tendency of power；

B, it is eated dishes without rice or wine the variation tendency of power according to radio frequency, determines the control starting value of radio-frequency front-end RF AAGC；

C, according to current radio frequency eat dishes without rice or wine power level, intermediate frequency statistics power level and ADC saturation threshold relationship, determine The control starting value of current intermediate-frequency section IF AAGC；

D, the calculating of uplink entire gain is carried out, RF AAGC and IF AAGC pad value is come into force, while in numeric field The compensation of AAGC pad value is set.

Preferably, this method further include: on radio-frequency front-end chain road, broadband power detection unit is arranged, and pass through coupling The device signal that will eat dishes without rice or wine is delivered to broadband power detection unit；

Radio frequency in A power of eating dishes without rice or wine is obtained by the broadband power detection unit real-time detection for being set to radio-frequency front-end link It arrives.

Preferably, the broadband power detection unit, which has peak value, latches ability.

Preferably, this method further include: on receiver chain road, filtered in the radio-frequency front-end and intermediate frequency of ADC front simulation link Independent gain adjustment unit is respectively set after wave device: rf gain adjusts unit and intermediate-frequency gain adjusts unit；

The RF AAGC adjusts unit by the rf gain and carries out gain adjustment；

The IF AAGC adjusts unit by the intermediate-frequency gain and carries out gain adjustment.

Preferably, the B includes:

If a, radio frequency power of eating dishes without rice or wine becomes larger, according to the statistical value of a cycle, radio frequency is inquired and starts to control table obtaining radio frequency AAGC control starting value；

If b, radio frequency power of eating dishes without rice or wine becomes smaller, in setting count range, eated dishes without rice or wine function according to the radio frequency in counting process Rate maximum value determines radio frequency AAGC burst size；

If c, radio frequency power of eating dishes without rice or wine remains unchanged, current radio frequency AAGC control starting value is remained unchanged.

Preferably, the C includes:

If a, ADC saturation threshold and the difference of intermediate frequency statistics power level are greater than setting thresholding, IFAAGC is lifted by dB Rise gain；

If b, intermediate frequency statistics power level is more than ADC saturation threshold, IF AAGC, which decays downwards, to be prevented from being saturated；If declined Decrement is beyond still supersaturation after the attenuation range of IF AAGC, then redundance needs further decline by RF AAGC Subtract；

If c, intermediate frequency counts power level within the scope of the following given threshold of ADC saturation threshold, IF AAGC is kept not Become；

If d, radio frequency eats dishes without rice or wine power level more than given threshold, but intermediate frequency statistics power level exists away from ADC saturation threshold Outside given threshold range, IF AAGC is disposably lifted the maximum gain adjustment amount of its designed capacity permission.

Present invention also provides a kind of broadband receiver AAGC devices, comprising:

It is provided with broadband power detection unit on radio-frequency front-end chain road, institute is delivered to by the coupling device signal that will eat dishes without rice or wine State broadband power detection unit, real-time detection and conversion of the broadband power detection unit for power of eating dishes without rice or wine, by that will work as The radio frequency of preceding measurement period eats dishes without rice or wine power compared with the statistical value of a upper periodic recording, obtains the eat dishes without rice or wine variation of power of radio frequency and becomes Gesture；

On receiver chain road, two-stage independence is provided with after the radio-frequency front-end and intermediate-frequency filter of ADC front simulation link Gain adjustment unit: rf gain adjusts unit and intermediate-frequency gain and adjusts unit, is respectively used to RFAAGC and IF AAGC；

Digital link part is provided with digital gain compensation unit, for the overall attenuation to RF AAGC and IF AAGC Linear compensation is carried out, entirely simulation+digital link gain is constant to keep receiver, and baseband receiving signals is made to meet target Power bracket；

EF power statistic unit is provided with after ADC, statistics detects power as intermediate frequency with interior RSSI power, with broadband Power detecting unit synchronizes synperiodic detection；Unit is adjusted by intermediate-frequency gain again to be eated dishes without rice or wine performance number, intermediate frequency according to radio frequency Power detection value and the input port ADC target level calculate intermediate-frequency gain and adjust unit attenuation.

The variation tendency of power preferably, the rf gain adjusting unit is used to be eated dishes without rice or wine according to radio frequency, before determining radio frequency The control starting value for holding RF AAGC, specifically includes:

It is described, then cooperate the algorithm of table-look-up type, to adjust the gain adjustment point of radio-frequency front-end link, to control the rule of slow play fastly Then control the attenuation that rf gain adjusts unit.

Preferably, the intermediate-frequency gain, which adjusts unit, counts power level according to eat dishes without rice or wine power level, intermediate frequency of current radio frequency And the relationship of ADC saturation threshold, it determines the control starting value of current intermediate-frequency section IF AAGC, specifically includes:

If a, ADC saturation threshold and the difference of intermediate frequency statistics power level are greater than setting thresholding, IF AAGC is lifted by dB Rise gain；

As seen from the above technical solution, the broadband receiver AAGC method and apparatus that the application proposes, which can obtain, following to be had Beneficial effect:

1, it by designing independent broadband power detection unit in radio-frequency front-end, eats dishes without rice or wine power for real-time monitoring, in turn The gain adjustment point of radio-frequency front-end link is adjusted according to the power, it can be in large bandwidth/power bracket to power of eating dishes without rice or wine Accurately measured.Interference actual measurement is simulated with signal source, the detection accuracy of broadband power detection unit is within +/- 0.5dB.

2, by using " controlling slow play fastly " algorithm, quick response is started to control immediately if detecting the big signal of input, if detection To big blackout, then start timer, big signal strength is continuously counted within a period of time and is subsided, then is declined what is started to control Decrement discharges.Fast control slow play algorithm significantly reduces the starting to control of receiver-and discharges number, dry by the intermittent bursts in period of 2s For disturbing, by slow play period assignment be 30s, then start to control-discharge caused by bursty interference within 1 minute number can reduce by 90% with On.

Meanwhile starting to control mechanism with RF/IF two-stage AAGC and carrying out gain adjustment to outer, inband signaling respectively, do not increasing In the case where external filter, can satisfy the biggish bandwidth range requirement of user, (the RRU product of the commercialization technology is received at present Bandwidth > 100MHz), and have stronger antiblocking ability under the more complex frequency range of some environmental disturbances.

3, by setting ADC saturation threshold for the target level of the input port ADC, it is arranged after intermediate-frequency filter independent Intermediate-frequency gain adjusts point, when radio-frequency front-end, which exists, to be blocked and start to control more by force, can be used to be lifted the gain of inband signaling, with patch Close-target level.

Therefore, the present invention is much larger than the design of carrier wave actual bandwidth this kind broadband receiver to filter for receiver bandwidth All has the property of can refer to.

Detailed description of the invention

Fig. 1 is the disturbed condition of traditional narrow receiver and the disturbed condition schematic diagram of broadband receiver；

Fig. 2 is the application broadband receiver AAGC schematic device；

Fig. 3 is the flow diagram of the application broadband receiver AAGC algorithm；

Fig. 4 is the implementation design scheme schematic diagram of the preferable broadband receiver AAGC device of the application one；

Fig. 5 is the implementation flow chart of the preferable broadband receiver AAGC control algolithm of the application one.

Specific embodiment

It is right hereinafter, referring to the drawings and the embodiments, for the objects, technical solutions and advantages of the application are more clearly understood The application is described in further detail.

Present inventor after analyzing the prior art by thinking: for above-mentioned first problem, being only abutted against Power statistic point in receipts machine receives link itself can not solve the problems, such as to acquire the way for power of eating dishes without rice or wine, and need to introduce special Broadband is eated dishes without rice or wine power detecting unit, this detection unit needs preferable real-time and power statistic range, and in biggish band Have good gain flatness and temperature characterisitic in wide scope, is examined with simplifying design of the detection link in frequency benefit and temperature compensation Consider.Secondly, for intermittent bursty interference problem, to consider to meet simultaneously improve AAGC response speed and control AAGC start to control, Discharge the demand of frequency this pair of " contradiction ".In addition, being involved aiming at the problem that " being manslaughtered " useful signal by band external blocking, need Reasonable Gain Adjustment Strategy is designed, band external blocking signal and distinguishing with interior useful signal is treated.

For this purpose, the application proposes a kind of broadband receiver AAGC device and control algolithm.Fig. 2 is the application broadband receiver AAGC schematic device.It is as shown in Figure 2:

Entire receiver chain road, it is independent to be arranged two-stage after the radio-frequency front-end and intermediate-frequency filter of ADC front simulation link Gain adjustment unit: " rf gain adjusting unit " and " intermediate-frequency gain adjusting unit " as shown in the figure (can such as pass through setting VGA (adjustable gain attenuator) Lai Shixian), it is respectively used to the AAGC gain adjustment (calling RF AAGC in the following text) and intermediate frequency of radio-frequency front-end Partial AAGC gain adjustment (calling IF AAGC in the following text)；

Digital link part be arranged digital gain compensation unit, for the overall attenuation to RF AAGC and IF AAGC into Row linear compensation, to keep receiver, entirely simulation+digital link gain is constant, and baseband receiving signals is made to meet target function Rate range；

On radio-frequency front-end chain road, independent broadband power detection unit is delivered to by the coupling device signal that will eat dishes without rice or wine (discrete design or the design of radio frequency chip integrated form can be used), by the real-time detection and conversion of its power of being responsible for eating dishes without rice or wine, then The algorithm for cooperating table-look-up type, to adjust the gain adjustment point of radio-frequency front-end link, to control the rule control rf gain of slow play fastly Adjust the attenuation of unit.

EF power statistic unit is set after ADC, and statistics detects power as intermediate frequency with interior RSSI power, with broadband function Rate detection unit synchronizes synperiodic detection；Unit is adjusted by intermediate-frequency gain again to be eated dishes without rice or wine performance number, intermediate frequency function according to radio frequency Rate detected value and the input port ADC target level (such as ADC saturation threshold+surplus) calculate intermediate-frequency gain and adjust unit decaying Amount.

Fig. 3 is the flow diagram of the application broadband receiver AAGC algorithm.Referring to Fig. 3, the AAGC in a cycle is calculated Method process is divided into 4 big steps, in which:

Step 1: the intermediate frequency statistics power that the radio frequency in same measurement period is eated dishes without rice or wine after power and ADC is obtained, it will be current The radio frequency of measurement period eats dishes without rice or wine power compared with the statistical value of a upper periodic recording, obtains the eat dishes without rice or wine variation of power of radio frequency and becomes Gesture.

In this step, the large period (such as second grade, it may be assumed that s grades) of entire AAGC control algolithm is generally higher than radio-frequency power detection The real-time detection period (such as Microsecond grade, it may be assumed that us grades) of unit requires power detecting unit to have peak value at this time and latches ability, i.e., The maximum power value in this period of time is saved in a large period until reading.Wherein, term " reading " is meant: the peak value Register value is removed while reading；After reading, the statistics that can start next round peak value is latched.

Step 2: being eated dishes without rice or wine the variation tendency of power according to radio frequency, determines the control starting value of RF AAGC, exist here following several Kind is possible:

If a, radio frequency power of eating dishes without rice or wine becomes larger, according to the statistical value of a cycle (us grades), inquires radio frequency and start to control table and obtain Obtain radio frequency AAGC control starting value；What this processing mode embodied is foregoing " fast control " strategy of the application；

If b, radio frequency power of eating dishes without rice or wine becomes smaller, counted using counter (such as: it is counted using count-up counter Number), Counter Value be more than setting thresholding when, according to the radio frequency in entire counting process eat dishes without rice or wine power maximum value determine radio frequency AAGC burst size；That is: setting count range in, according to the radio frequency in counting process eat dishes without rice or wine power maximum value determine radio frequency AAGC Burst size；What this processing mode embodied is the application foregoing " slow play " strategy；

In this step, due to taking the strategy of fast control slow play, when external disturbance instantaneous fading, RF AAGC can't be stood Change, until all counting interference rollback of eating dishes without rice or wine in the period in continuous counts, it is extensive just to adjudicate RF AAGC control starting value It is multiple, effectively reduce the movement frequency that AAGC is started to control repeatedly, discharged；The counting period of slow play can be engineering experience value, can also It is designed as to be adjusted flexibly according to the actual situation with parameter to facilitate.

Step 3: according to current radio frequency eat dishes without rice or wine power level, intermediate frequency statistics power level and ADC saturation threshold pass System, determines the control starting value of current IF AAGC, exists here following several possible:

If a, intermediate frequency statistics power level from ADC saturation threshold have with a certain distance from (such as: ADC saturation threshold and intermediate frequency The difference for counting power level is greater than setting thresholding), IF AAGC should be lifted gain by dB；

B, intermediate frequency statistics power is more than saturation threshold, and IF AAGC, which decays downwards, to be prevented from being saturated；If attenuation exceeds IF Still supersaturated after the attenuation range of AAGC, then redundance needs are further decayed by RF AAGC；

C, intermediate frequency count power within the scope of the following given threshold of saturation threshold (such as: below saturation threshold 1dB with It is interior), IF AAGC is remained unchanged；

D, radio frequency eats dishes without rice or wine power more than given threshold, but intermediate frequency statistics power still has larger surplus, IF away from ADC saturation threshold AAGC should disposably be lifted the maximum gain adjustment amount of its designed capacity permission.

It whether is more than threshold value (default empirical value) by judgement power of eating dishes without rice or wine in this step, to determine whether having big Block inside and outside band, when there are big block signal, judges the compressed feelings of useful signal to count EF power intensity after ADC Condition is done disposable link gain with IF AAGC and is lifted when useful signal intensity reaches far away ADC saturation threshold, keeps it fast Speed draws close target level；In the case of other, the general principle of IF AAGC adjustment is that EF power is more than that target level then declines downwards Subtract, target level then gradually lifting gain upwards has not yet been reached in EF power.

Step 4: carrying out the calculating of uplink entire gain, RF AAGC and IF AAGC pad value is come into force, while in number The compensation of AAGC pad value is arranged in word domain, and link gain is kept to stablize.

The main purpose of this step is to make the gain of uplink each section link meet calibration to require, and make receiver chain Road entire gain keeps stablizing, this part is roughly the same with the uplink open-loop gain control method of common receiver, and difference exists In: in numeric field part, need to return the attenuation compensation of RF AAGC+IF AAGC.

Technical scheme is illustrated below by a preferred embodiment.

Fig. 4 is the implementation design scheme schematic diagram of the preferable broadband receiver AAGC device of the application one.Such as

Shown in Fig. 4, broadband power detection unit is made of detection tube, amplifier, ADC and FPGA, and the detection tube of institute's type selecting exists There is good temperature and frequency response stability in super large bandwidth range, and us grades of period statistics may be implemented in FPGA simultaneously And peak value latches；What it is due to detection tube detection is voltage value, it is assumed that detection tube input terminal voltage value is Vin, and FPGA is after ADC The voltage value counted on is Vout, can extrapolate and there is linear relationship between the two:

Vout=α Vin+ β,

I.e.

Assuming that the power P in that eats dishes without rice or wine instead is released by Vin again, then also needing to consider that this section is penetrated from antenna opening to coupling device The yield value of frequency front end link.If radio-frequency front-end link fixed gain is Gref (positive value), then α, β and Gref value can pass through The means for pouring into known power high low signal test out in advance, and there are corresponding relationships for 3 parameters of this group, can use parameter list Form is solidificated in receiver ROM, and computing unit uses when for operation.

In use, calculating the actual gain value Grf_current of current radio frequency front end link first:

Grf_current=Grf_freq+Grf_temp+Gvga_real

Wherein, Gvga_real is current radio frequency attenuator actual attenuation value (negative value)；

Grf_freq is the radio-frequency front-end gain (i.e. fixed gain+frequency carried out after frequency compensation with filter center frequency point Rate compensation rate)；

Grf_temp is the temperature compensation value carried out according to Current Temperatures to it.

If the voltage value read at this time from detection ADC is Vout, the voltage Vrf_in that eats dishes without rice or wine can be calculated:

Wherein:

Then the performance number Pin that eats dishes without rice or wine (unit dBm, system are 50 ohmage of standard) is scaled by voltage value of eating dishes without rice or wine again:

It converses after eating dishes without rice or wine power, inquires preset RF AGC and start to control table, obtain RF AAGC attenuation, the decaying of the table Gear design is related to specific product and device specification, and table 1 is a kind of example, only for reference:

Table 1

The above are the implementation design scheme of broadband power detection unit, the implementation example of entire AAGC control algolithm can join Examine flow chart as shown in Figure 5.Some of parameters are related to product and specific implementation, if AAGC control large period is designed as 1 second, The slow play counting period is 30 times, and intermediate frequency AAGC control range is [- 5 ,+6] dB, and the big signal threshold value of radio-frequency front-end is -24dBm, ADC Saturation threshold is -6dbfs etc., does not have General guidance, only for reference.

Process shown in Fig. 5 in 1s period treatment the following steps are included:

Step 1: the detection tube output valve that the removal local data base period updates calculates radio frequency and eats dishes without rice or wine power P _ rf_input And judge variation tendency, obtain EF power P_If_calc.

Step 2: judge that the eat dishes without rice or wine trend of power of radio frequency becomes larger, becomes smaller or constant:

If constant, Vga_rf_aagc is remained unchanged, and jumps to step 3.

If become larger, inquiry AGC starts to control table, records Vga_rf_aagc, and restores counter Cnt clearing, restores power and is Invalid value；It records the radio frequency that currently comes into force to eat dishes without rice or wine performance number and rf_aagc value, and judges whether P_rf_input is greater than or waits In -24, if P_rf_input is less than -24, step 3 is jumped to；Otherwise, if P_rf_input is more than or equal to -24, Judge whether intermediate frequency AAGC can directly lift to 6, if it can, Vga_if_aagc may be configured as 6, jumps to step 5, if Cannot, continue to execute step 3.

If become smaller, AAGC restores counter Cnt++, is regularly refreshed radio frequency and eats dishes without rice or wine to restore performance number, and judges that Cnt is It is no to be more than or equal to 30, if Cnt less than 30, jumps to step 3, otherwise, if Cnt is more than or equal to 30, use database In radio frequency eat dishes without rice or wine to restore performance number as current power of eating dishes without rice or wine, continue to locate according to the branch of above-mentioned " if becoming larger " Reason.

Step 3: the interval judgement of P_If_calc and saturation threshold -6dbfs are carried out, following three kinds of situations are divided into:

If P_If_calc≤- 7, if RF or IF AAGC has been started to control, epicycle can be lifted 1dB, Vga_ upwards If_aagc_delta=1 jumps to step 4；

If P_If_calc > -6, the amount Vga_if_aagc_delta that this IF AAGC needs to adjust is calculated, is jumped to Step 4；

If P_If_calc fall in (- 7, -6] section, then epicycle IF part be not required to adjust, Vga_if_aagc_delta= 0, jump to step 4.

Step 4: the section for carrying out [- 5,6] epicycle Vga_if_aagc being handled, -5 part is overflowed, is put into Vga_rf_ In aagc.

Step 5: record epicycle IF AAGC Configuration Values.

Step 6: carrying out uplink gain control, configuration radio frequency and intermediate-frequency gain decaying and digital gain, gain configuration After coming into force, detection tube peak power is read, returns to 1s period treatment.

The foregoing is merely the preferred embodiments of the application, not to limit the application, all essences in the application Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the application protection.

Claims

1. a kind of broadband receiver simulates automatic growth control AAGC method characterized by comprising

A, the intermediate frequency statistics power that the radio frequency in same measurement period is eated dishes without rice or wine after power and ADC is obtained, by the current statistic period Radio frequency eat dishes without rice or wine power compared with the statistical value of a upper periodic recording, obtain radio frequency and eat dishes without rice or wine the variation tendency of power；

C, it is eated dishes without rice or wine the relationship of power level, intermediate frequency statistics power level and ADC saturation threshold, is determined current according to current radio frequency The control starting value of intermediate-frequency section IF AAGC；

D, the calculating of uplink entire gain is carried out, RF AAGC and IF AAGC pad value is come into force, while being arranged in numeric field The compensation of AAGC pad value.

2. according to the method described in claim 1, it is characterized by:

This method further include: on radio-frequency front-end chain road, broadband power detection unit is set, and will eat dishes without rice or wine letter by coupling device Number it is delivered to broadband power detection unit；

Radio frequency in A power of eating dishes without rice or wine is obtained by the broadband power detection unit real-time detection for being set to radio-frequency front-end link.

3. according to the method described in claim 2, it is characterized by:

The broadband power detection unit has peak value and latches ability.

4. method according to claim 1, it is characterised in that:

This method further include: on receiver chain road, set respectively after the radio-frequency front-end and intermediate-frequency filter of ADC front simulation link Set independent gain adjustment unit: rf gain adjusts unit and intermediate-frequency gain adjusts unit；

The RF AAGC adjusts unit by the rf gain and carries out gain adjustment；

5. method according to any one of claims 1 to 4, which is characterized in that the B includes:

If b, radio frequency power of eating dishes without rice or wine becomes smaller, in setting count range, power is eated dishes without rice or wine most according to the radio frequency in counting process Big value determines radio frequency AAGC burst size；

6. method according to any one of claims 1 to 4, which is characterized in that the C includes:

If a, ADC saturation threshold and the difference of intermediate frequency statistics power level are greater than setting thresholding, IF AAGC is lifted by dB to be increased Benefit；

If b, intermediate frequency statistics power level is more than ADC saturation threshold, IF AAGC, which decays downwards, to be prevented from being saturated；If attenuation Still supersaturated after attenuation range beyond IF AAGC, then redundance needs are further decayed by RF AAGC；

If c, intermediate frequency counts power level within the scope of the following given threshold of ADC saturation threshold, IF AAGC is remained unchanged；

If d, radio frequency eats dishes without rice or wine power level more than given threshold, but intermediate frequency statistics power level is being set away from ADC saturation threshold Outside threshold range, IF AAGC is disposably lifted the maximum gain adjustment amount of its designed capacity permission.

7. a kind of broadband receiver AAGC device characterized by comprising

It is provided with broadband power detection unit on radio-frequency front-end chain road, the width is delivered to by the coupling device signal that will eat dishes without rice or wine Band power detecting unit, real-time detection and conversion of the broadband power detection unit for power of eating dishes without rice or wine, by will currently unite The radio frequency in meter period eats dishes without rice or wine power with the statistical value of a upper periodic recording compared with, and acquisition radio frequency is eated dishes without rice or wine the variation tendency of power；

On receiver chain road, the independent increasing of two-stage is provided with after the radio-frequency front-end and intermediate-frequency filter of ADC front simulation link Benefit adjusts unit: rf gain adjusts unit and intermediate-frequency gain adjusts unit, is respectively used to RF AAGC and IF AAGC；

Digital link part is provided with digital gain compensation unit, is carried out for the overall attenuation to RF AAGC and IF AAGC Linear compensation, to keep receiver, entirely simulation+digital link gain is constant, and baseband receiving signals is made to meet target power Range；

EF power statistic unit is provided with after ADC, statistics detects power as intermediate frequency with interior RSSI power, with broadband power Detection unit synchronizes synperiodic detection；Unit is adjusted by intermediate-frequency gain again to be eated dishes without rice or wine performance number, EF power according to radio frequency Detected value and the input port ADC target level calculate intermediate-frequency gain and adjust unit attenuation.

8. device according to claim 7, which is characterized in that the rf gain adjusts unit for eating dishes without rice or wine according to radio frequency The variation tendency of power determines the control starting value of radio-frequency front-end RF AAGC, specifically includes:

It is described, then cooperate the algorithm of table-look-up type, to adjust the gain adjustment point of radio-frequency front-end link, to control the rule control of slow play fastly Rf gain processed adjusts the attenuation of unit.

9. device according to claim 7, which is characterized in that the intermediate-frequency gain adjusts unit and eated dishes without rice or wine according to current radio frequency The relationship of power level, intermediate frequency statistics power level and ADC saturation threshold, determines starting to control for current intermediate-frequency section IF AAGC Value, specifically includes: