CN100386973C - Method of automatic gain correction for down going channel - Google Patents
Method of automatic gain correction for down going channel Download PDFInfo
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- CN100386973C CN100386973C CNB2004101024796A CN200410102479A CN100386973C CN 100386973 C CN100386973 C CN 100386973C CN B2004101024796 A CNB2004101024796 A CN B2004101024796A CN 200410102479 A CN200410102479 A CN 200410102479A CN 100386973 C CN100386973 C CN 100386973C
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Abstract
The present invention discloses a method of automatic gain correction for down going channels, which adopts a taking integer of a multiple value of the multiple number of a difference value of a current gain value and a target gain value to adjusting accuracy for dynamically determining a current step value, and accomplishes once the adjustment of the gain of down going channels by using the step value which is practically obtained every time as adjusting quantity. The present invention ensures to rapidly accomplish the adjustment of the gain of the down going channels and to preserve gain stability within the shortest time under the condition of slight change of the gain of the down going channels or small change of the gain of the down going channels or large change of the gain of the down going channels through the dynamic adjusting mode of the gain of the down going channels of variable steps. Consequently, the expense of a system to the persistent adjustment of the gain of the down going channels is reduced.
Description
Technical field
The present invention relates to gain control, refer to a kind of method of automatic gain correction for down going channel especially.
Background technology
Can export more stable maximum downstream power in order to guarantee base station (NodeB), system is provided with target gain value, difference between down going channel power output and input power, be that yield value between down going channel power output and the input power is when departing from objectives yield value, need proofread and correct the down going channel gain, its power output is returned to and input power between yield value remain on the target gain value level, thereby guarantee the stability of NodeB power output.
Down going channel comprises the distribution on rf board (NTRX), the backboard, refers to connecting line, power amplifier (NLPA), duplexer (NDDL) and antenna feeder distribution between rf board and the backboard here.Here, the loop that the NTRX in the down going channel, distribution on the backboard and NLPA are formed is referred to as the ring inner control part of automatic gain correction for down going channel, and NDDL and antenna feeder distribution are not included in the ring; The gain fluctuation of NDDL and antenna feeder distribution does not influence the correction of loop to the down going channel power gain; And the precision fluctuation meeting of the gain fluctuation of the gain fluctuation of the gain fluctuation of NTRX, the distribution on the backboard and NLPA and NLPA wave detector impacts the correction of down going channel power gain, this fluctuation makes the NodeB power output produce fluctuation thereupon, thereby the covering radius that makes NodeB has bigger fluctuation, causes the instability of NodeB power output.Here, because send some data of NTRX to NLPA, so the gain fluctuation of the distribution on the backboard also can impact the correction of down going channel power gain by the distribution on the backboard.
Fig. 1 is a prior art automatic gain correction for down going channel structural representation, and among Fig. 1, the multiplication factor of power amplifier is 1.In conjunction with Fig. 2 prior art automatic gain correction for down going channel flow chart, prior art to the automatic bearing calibration of down going channel gain is: at first, obtain NTRX output gross power Pa and NLPA output detection power by input power statistical module and power output statistical module respectively; Then, system exports detection power P b feedback with NLPA, Pa compares with NTRX output gross power, and the yield value G between calculating NLPA output detection power P b and the NTRX output gross power Pa, then with this yield value G and target gain value Gt contrast, by dynamic adjustment, make that the yield value G between NLPA output detection power P b and the NTRX output gross power Pa remains on this maintenance level of target gain value Gt to yield value.
How introduce prior art below in detail and be that to down going channel gain carries out from dynamic(al) correction:
Step 200: obtain NTRX output gross power and NLPA output detection power.
Usually, NTRX comprises 4 blocks of plates, every respectively corresponding 1～4 carrier wave of NTRX, and the intermediate frequency output linear power of every NTRX correspondence is Pa
i, corresponding 1～4 carrier wave is distinguished in i=0～3 here.Among Fig. 1, the input power statistical module is added up NTRX output gross power Pa: Pa=is linear in dBm mapping (∑ Pa
i); The power output statistical module is inquired about current NLPA output detection power P b.
Step 201: system-computed current gain value G.
In this step, according to Pa and Pb value, the current gain G of system-computed, the current gain value G of down going channel is:
G＝Pb-Pa。
Step 202: judge whether current gain value G equals target gain value Gt,, then return step 201 if the two is equal; Otherwise, carry out next step.
Target gain value Gt is that system sets, general Gt=60dB.If G=Gt=60dB, illustrate that the yield value G between the power output of NLPA and NTRX is stabilized on the target gain value Gt level, the down going channel power output is stablized, and does not need down going channel gained to proofread and correct; If G is not equal to Gt, illustrate that current gain value G has departed from target gain value Gt, need control current down going channel gain, make yield value G equal target gain value Gt, thereby guarantee the stability of down going channel power output.
Step 203: calculate current gain controlling amount Δ G according to the fixed step size value.
Regulation power precision is 0.1dBm in the agreement, also gets 0.1dB so adjust precision, and promptly the fixed step size value is 0.1, and so, current gain controlling amount Δ G's is definite as follows:
When G＞Gt, illustrate that current gain value G forward bias from target gain value Gt, must reduce current gain value G, then current gain controlling amount Δ Gi (k)=Δ Gi (k-1)-0.1;
When G＜Gt, the current gain value G negative sense yield value Gt that departs from objectives is described, current gain value G must be increased then current gain controlling amount Δ Gi (k)=Δ Gi (k-1)+0.1.
Above in two formulas, i=0～3, respectively corresponding 1～4 carrier wave when carrying out gain calibration, carries out 4 NTRX respectively as can be seen.The gain controlling amount of the current i piece NTRX of Δ Gi (k) expression in the formula, Δ Gi (k-1) then is the gain controlling amount of the last order i piece NTRX of expression.Here, gain controlling amount initial value Δ Gi (0) can be set to 0, or carries out an initial gain when bringing into operation in system and proofread and correct, and obtains gain controlling amount initial value Δ Gi (0) in initial calibration.
So far, finish to down going channel gain from dynamic(al) correction.According to the gain controlling amount, system adjusts the power output of NTRX.
From the bearing calibration of prior art to down going channel gain, employing be that the fixed step size value is 0.1 to proofread and correct.When yield value G departs from objectives yield value Gt when bigger, such as new when changing a rf board or NodeB and just having begun to start, can cause yield value G sudden change, carry out gain calibration if adopt the method for prior art fixed step size, must cause the adjustment time long, thereby influence the quality that NodeB transmits; And depart from objectives yield value Gt very hour as yield value G, may cause and proofread and correct vibration, such as working as 0＜(G-Gt)＜0.1, or-0.1＜(G-Gt)＜0 o'clock, adjustment by fixed step size 0.1 just may cause G to form vibration in certain small range, has increased the unnecessary expense of system thereby the appearance gain continues to adjust.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of automatic gain correction for down going channel, and this method can be finished the adjustment to down going channel gain fast, thereby can keep the stability that gains.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of method of automatic gain correction for down going channel is provided with target gain value, it is characterized in that, this method may further comprise the steps:
A. determine current gain value according to rf board output gross power and power amplifier power output;
B. determine current step value according to current gain value, target gain value, power amplifier multiplication factor and adjustment precision, and judge whether current step value equals zero,, then return steps A if equal zero; Otherwise, carry out next step;
C. determine current gain controlling amount according to current step value.
Determine the method for current gain value described in the steps A: power amplifier power output and rf board are exported the poor of gross power.Determine the method for current step value described in the step B: the difference of calculating current gain value and target gain value respectively takes absolute value, and adjusts the product of precision and power amplifier multiplication factor L, and then the merchant back income value of calculating the former with the latter rounds.
The method of determining current gain controlling amount described in the step C comprises:
Whether judge described current gain value greater than described target gain value, if greater than, then described definite current gain controlling amount is the long-pending value of getting negative of described current step-length and described adjustment precision; Otherwise described definite current gain controlling amount is the long-pending value of described current step-length and described adjustment precision.
As seen from the above technical solution, the multiple of this employing power amplifier of the present invention Minimum Increment rounds dynamically determines each method of adjusting the current step value that needs, has realized once finishing the adjustment to the down going channel gain.Down going channel by this variable step dynamic adjustment mode that gains, guaranteed well under the situation very little in the down going channel change in gain, that the down going channel change in gain little or the down going channel change in gain is very big, all can in the shortest time, finish the adjustment of down going channel gain, and can keep the stability of gain, thereby reduced system to the lasting expense of adjusting of down going channel gain.
Description of drawings
Fig. 1 is a prior art automatic gain correction for down going channel structural representation;
Fig. 2 is a prior art automatic gain correction for down going channel flow chart;
Fig. 3 is an automatic gain correction for down going channel flow chart of the present invention.
Embodiment
Core concept of the present invention is: the current power yield value calculates according to the power output of rf board and power amplifier in system, and calculates current step-length according to current gain value, target gain value, power amplifier amplification coefficient and power amplifier least input increment.If current step-length equals zero, then do not do gain adjustment; Otherwise, current gain value and target gain value are compared: if current gain value less than target gain value, carries out sending into power amplifier after the positive justification to the rf board output frequency according to current step-length so; If current gain value greater than target gain value, carries out sending into power amplifier after the negative justification to the rf board output frequency according to current step-length so.This method owing to difference and the power amplifier least input increment considered between current gain value and the target gain value, can be finished gain adjustment on the one hand fast when calculating current step-length, can keep the stability that gains on the other hand.
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing preferred embodiment that develops simultaneously, the present invention is described in more detail.
Fig. 3 is an automatic gain correction for down going channel flow chart of the present invention, below in conjunction with Fig. 1 prior art automatic gain correction for down going channel structural representation, the inventive method is described in detail:
Step 300: obtain NTRX output gross power and NLPA output detection power.
Usually, NTRX comprises 4 blocks of plates, every respectively corresponding 1～4 carrier wave of NTRX, and the intermediate frequency output linear power of every NTRX correspondence is Pa
i, corresponding 1～4 carrier wave is distinguished in i=0～3 here.Among Fig. 1, the input power statistical module is added up NTRX output gross power Pa: Pa=is linear in dBm mapping (∑ Pa
i); The power output statistical module is inquired about current NLPA output detection power P b.
Step 301: system-computed current gain value.
In this step, according to Pa and Pb value, the current gain of system-computed, the current gain value G of down going channel is:
G＝Pb-Pa。
Current step value Gc equals: the difference of calculating current gain value G and target gain value Gt respectively takes absolute value, and it is long-pending to adjust precision and power amplifier multiplication factor L, and then income value rounds behind the merchant of calculating the former with the latter, just obtains current step value, and formula is as follows:
Gc＝int(ABS(G-Gt)/(L×0.1))
In the formula, said here adjustment precision is power amplifier Minimum Increment value just, is 0.1dBm according to agreement regulation power precision, is 0.1dB so adjust the precision value, and promptly power amplifier Minimum Increment value value is 0.1dB; The absolute value of determining to depend on difference between current gain value G and the target gain value Gt of current step value Gc, simultaneously, definite adjustment precision that also depends on of current step value Gc, promptly the absolute value with difference between current gain value G and the target gain value Gt is that the multiple value of adjusting precision is determined current step value Gc.Here why be because the gain controlling amount is that the power output to NTRX is adjusted before power amplifier divided by power amplifier multiple L, enter again afterwards that power amplifier amplifies, so consider the gain controlling amount to be dwindled power amplifier multiple L doubly earlier, do not repeated to amplify the mistake that causes with regard to not causing so before.
From the current step value Gc of the present invention computing formula as can be seen, when 0＜ABS (G-Gt)＜0.1, because power amplifier multiplication factor L equals 1, so current step-length Gc must be null.Like this, at 0＜ABS (G-Gt)＜0.1 in this case, be not need to carry out any adjustment, also just avoided prior art owing to continuing to adjust the unnecessary expense of system that vibration causes.
In addition, from the current step value Gc of the present invention computing formula as can be known, current step value Gc no longer fixes, but decide by the depart from objectives degree of yield value Gt of current gain value G, the current gain value G yield value Gt that departs from objectives is big more, current step value Gc is big more, like this, even change the yield value G sudden change that causes when a rf board or NodeB have just begun to start newly, also can once adjust to the right place by method of the present invention, need not to adjust length by length, accelerated to regulate the speed according to fixed step size.
From this step as can be seen, the computing formula of this current step-length Gc that the present invention adopts has kept the stability of gain on the one hand, has also reached on the other hand and has finished the purpose that gain is adjusted fast.
Step 304: calculate current gain controlling amount Δ G according to current step value.
At first judging the magnitude relationship of current gain value G and target gain value Gt, is increment or depreciation to determine current gain controlling amount Δ G, promptly be negative value or on the occasion of; In the size of calculating current gain controlling amount Δ G, specifically determine as follows then:
When G＞Gt, illustrate that the current gain value forward bias from target gain value, must reduce current gain value, then current gain controlling amount Δ Gi=-Gc * 0.1;
When G＜Gt, the current gain value negative sense yield value that departs from objectives is described, current gain value must be increased then current gain controlling amount Δ Gi=Gc * 0.1.
Above in two formulas, i=0～3, respectively corresponding 1～4 carrier wave when carrying out gain calibration, carries out 4 NTRX respectively as can be seen.Δ Gi represents the gain controlling amount of current i piece NTRX in the formula.
So far, finish to down going channel gain from dynamic(al) correction.According to the gain controlling amount, system adjusts the power output of NTRX.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (4)
1. the method for an automatic gain correction for down going channel is provided with target gain value, it is characterized in that, this method may further comprise the steps:
A. determine current gain value according to rf board output gross power and power amplifier power output;
B. determine current step value according to current gain value, target gain value, power amplifier multiplication factor and adjustment precision, and judge whether current step value equals zero,, then return steps A if equal zero; Otherwise, carry out next step;
C. determine current gain controlling amount according to current step value.
2. method according to claim 1 is characterized in that, determine the method for current gain value described in the steps A: power amplifier power output and rf board are exported the poor of gross power.
3. method according to claim 1 and 2, it is characterized in that, determine the method for current step value described in the step B: the difference of calculating current gain value and target gain value respectively takes absolute value, adjust the product of precision and power amplifier multiplication factor L, and then the merchant back income value of calculating the former with the latter rounds.
4. method according to claim 3 is characterized in that, determines described in the step C that the method for current gain controlling amount comprises:
Whether judge described current gain value greater than described target gain value, if greater than, then described definite current gain controlling amount is the long-pending value of getting negative of described current step-length and described adjustment precision; Otherwise described definite current gain controlling amount is the long-pending value of described current step-length and described adjustment precision.
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| CNB2004101024796A CN100386973C (en) | 2004-12-23 | 2004-12-23 | Method of automatic gain correction for down going channel |
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| CN100386973C true CN100386973C (en) | 2008-05-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI825510B (en) * | 2021-11-12 | 2023-12-11 | 瑞昱半導體股份有限公司 | Calibration circuit and calibration method of wireless transceiver |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101742627B (en) * | 2010-01-14 | 2012-08-29 | 京信通信系统（中国）有限公司 | Digital automatic gain control method of communication system and control system thereof |
| CN109560823B (en) * | 2018-11-28 | 2020-11-03 | 京信通信系统（中国）有限公司 | Gain fluctuation correction method, device and storage medium for digital communication equipment |
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2004
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| US20020122460A1 (en) * | 1995-01-04 | 2002-09-05 | Interdigital Technology Corporation | Spread spectrum adaptive power control |
| US5896411A (en) * | 1997-05-05 | 1999-04-20 | Northern Telecom Limited | Enhanced reverse link power control in a wireless communication system |
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| WO2004015895A1 (en) * | 2002-07-05 | 2004-02-19 | Freescale Semiconductor, Inc. | Transmitter and receiver gain calibration by means of feedback in a transceiver |
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| TWI825510B (en) * | 2021-11-12 | 2023-12-11 | 瑞昱半導體股份有限公司 | Calibration circuit and calibration method of wireless transceiver |
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Effective date of registration: 20200722 Address after: No.010, District 1, Lizhuang village, Daliuhe Town, Wenan County, Langfang City, Hebei Province Co-patentee after: Li Ling Patentee after: Li Jianbing Co-patentee after: Sun Hanquan Co-patentee after: Zhang Hongmei Address before: 518000 Baoan District Xin'an street, Shenzhen, Guangdong, No. 625, No. 625, Nuo platinum Plaza, Patentee before: SHENZHEN SHANGGE INTELLECTUAL PROPERTY SERVICE Co.,Ltd. Effective date of registration: 20200722 Address after: 518000 Baoan District Xin'an street, Shenzhen, Guangdong, No. 625, No. 625, Nuo platinum Plaza, Patentee after: SHENZHEN SHANGGE INTELLECTUAL PROPERTY SERVICE Co.,Ltd. Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: HUAWEI TECHNOLOGIES Co.,Ltd. |
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