CN101145816A - Method and module for quickly adjusting automatic gain control value - Google Patents
Method and module for quickly adjusting automatic gain control value Download PDFInfo
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- CN101145816A CN101145816A CNA2007101473549A CN200710147354A CN101145816A CN 101145816 A CN101145816 A CN 101145816A CN A2007101473549 A CNA2007101473549 A CN A2007101473549A CN 200710147354 A CN200710147354 A CN 200710147354A CN 101145816 A CN101145816 A CN 101145816A
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Abstract
The invention provides a method used for fast adjusting the automatic gain control value of a wireless communication receiver and a module thereof. The method comprises that: first, an initial value is set; second, the data overflow frequency is counted; then, the automatic gain step length is regulated; then, the automatic gain control value is adjusted; finally, the process is repeated until that the automatic gain control value is restrained to the stable value. The module comprises an initialization unit, an overflow counter, an overflow frequency comparison unit, an automatic gain control step length regulation unit as well as an automatic gain control value regulation unit. The method and the module of the invention realize the fast adjustment to the automatic gain control value, accelerate the speed of the automatic gain control regulation and shorten the regulation time in the finite time division system of the dynamic range.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of automatic gain control value method of adjustment and module thereof of wireless communication terminal receiver.
Background technology
In wireless communication system, in order to obtain good reception, must guarantee the precision of input signal, but because receiving system is in the process that constantly moves, channel situation constantly changes, the influence that the signal amplitude of input analog-to-digital converter is declined changes more violent, therefore need before analog to digital converter, add automatic gain control (Automatic Gain Control, be AGC), thereby being input to the amplitude of the analog signal of analog to digital converter, assurance roughly is stabilized near certain numerical value.
Automatic gain control is meant the watt level according to the data that receive, and adjusts the control algolithm of receiving gain automatically, to reach the performance of better reception data.In the Data Receiving of wireless communication system, require the receiving terminal can be fast according to the power level of received signal, adaptive adjustment receiving gain is to reach the performance of better reception data.Existing algorithm generally is the fixed gain step-length, adjusts the value that automatic gain is controlled according to the received signal energy, and the shortcoming of this algorithm is that convergence rate is slow, can not adapt to the requirement of Modern Communication System two-forty, is unfavorable for the improvement of the receptivity of data simultaneously.
Summary of the invention
The objective of the invention is to, a kind of method and module thereof that is used for the quickly adjusting automatic gain control value of wireless communication receiver is provided.
A kind of method of quickly adjusting automatic gain control value is used for realizing the rapid adjustment to automatic gain control value according to the power that receives data that described method comprises the steps: successively
Step 1): the initial value of automatic gain control value and the initial value of automatic gain control step-length are set, and the value that the reception data are overflowed thresholding, automatic gain control value lower limit and the automatic gain control value upper limit is set;
Step 2): in a time cycle, calculate described reception data and overflow number of times by overflowing counter;
Step 3): the described data that the described reception data comparison step 2) are overflowed in number of times and the step 1) are overflowed thresholding, if described reception data are overflowed number of times and are overflowed thresholding greater than described data, then described automatic gain control step-length is reduced in proportion, and proceed to step 4); If described reception data are overflowed number of times and are less than or equal to described data and overflow thresholding, then described automatic gain control step-length remains unchanged, and proceeds to step 5);
Step 4): the difference and the described automatic gain lower control limit value of more current automatic gain control value and described automatic gain control step-length, if the difference of current automatic gain control value and described automatic gain control step-length is greater than described automatic gain lower control limit value, then the automatic gain control value of following one-period is set to the difference of current automatic gain control value and described automatic gain control step-length and proceeds to step 6); The difference of current automatic gain control value and described automatic gain control step-length is less than described automatic gain lower control limit value, and then automatic gain control value is set to described automatic gain lower control limit value and proceeds to step 6) following one-period;
Step 5): more current automatic gain control value and described automatic gain control step-length sum and described automatic gain upper control limit value, if current automatic gain control value and described automatic gain control step-length sum is greater than described automatic gain upper control limit value, then automatic gain control value is set to described automatic gain upper control limit value and proceeds to step 6) following one-period; If current automatic gain control value and described automatic gain control step-length sum is less than described automatic gain upper control limit value, then automatic gain control value is set to current automatic gain control value and described automatic gain control step-length sum and proceeds to step 6) following one-period;
Step 6): return step 2) to carry out the adjustment of next time cycle, converges to stationary value until automatic gain control value.
Wherein, if described reception data are overflowed number of times and overflowed thresholding greater than described data, then reduce described automatic gain control step-length in proportion.
Wherein, if described reception data are overflowed number of times and overflowed thresholding greater than described data, then adjust described automatic gain step-length by index.
Wherein, described automatic gain control value upper and lower bound is determined by the changing voltage bound that the front end analog-to-digital conversion module provides.
Wherein, the length of selected described time cycle can accurately be followed the variation of current channel, and system is unlikely to, and over-burden because amount of calculation is too big.
Wherein, to overflow the selection principle of the initial value of the initial value of the value of thresholding, described automatic gain control step-length and automatic gain control value be to make automatic gain control value can converge to stationary value quickly to described reception data.
A kind of module that realizes quickly adjusting automatic gain control value is used for realizing the rapid adjustment to automatic gain control value according to the power that receives data, and described module comprises:
Initialization unit is used to be provided with the initial value of automatic gain control value and the initial value of automatic gain control step-length, and the value that the reception data are overflowed thresholding, automatic gain control value lower limit and the automatic gain control value upper limit is set;
Overflow counter, be used for interior reception data of time cycle of accumulative total and overflow number of times;
Overflow the number of times comparing unit, be used for that more described reception data are overflowed number of times and described reception data are overflowed thresholding;
Automatic gain control step-length adjustment unit is used for adjusting automatically the automatic gain step-length;
The automatic gain control value adjustment unit is used for adjusting automatically automatic gain control value;
Wherein, described automatic gain control step-length adjustment unit) when described reception data are overflowed number of times and overflowed thresholding greater than described data, described automatic gain control step-length is reduced in proportion, overflow number of times in described reception data and be less than or equal to and do not change described automatic gain when described data are overflowed thresholding and control step-length;
Wherein, described automatic gain control value adjustment unit is when described reception data are overflowed number of times and overflowed thresholding greater than described data, the difference of current automatic gain control value and described automatic gain control step-length during greater than described automatic gain lower control limit value the automatic gain control value of following one-period be set to the poor of current automatic gain control value and described automatic gain control step-length, the difference of current automatic gain control value and described automatic gain control step-length is less than described automatic gain lower control limit value, and then automatic gain control value is set to described automatic gain lower control limit value following one-period; Described automatic gain control value adjustment unit (104) overflows number of times in described reception data and is less than or equal to described data when overflowing thresholding, if current automatic gain control value and described automatic gain control step-length sum are greater than described automatic gain upper control limit value, then automatic gain control value is set to described automatic gain upper control limit value following one-period, if current automatic gain control value and described automatic gain control step-length sum is less than described automatic gain upper control limit value, then automatic gain control value is set to current automatic gain control value and described automatic gain control step-length sum following one-period.
Wherein, if described reception data are overflowed number of times and overflowed thresholding greater than described data, then reduce described automatic gain control step-length in proportion.
Wherein, if described reception data are overflowed number of times and overflowed thresholding greater than described data, then adjust described automatic gain step-length by index.
Wherein, described automatic gain control value upper and lower bound is determined by the changing voltage bound that the front end analog-to-digital conversion module provides.
Wherein, the length of selected described time cycle can accurately be followed the variation of current channel, and system is unlikely to, and over-burden because amount of calculation is too big.
Wherein, to overflow the selection principle of the initial value of the initial value of the value of thresholding, described automatic gain control step-length and automatic gain control value be to make automatic gain control value can converge to stationary value quickly to described reception data.
The method according to this invention and module thereof in dynamic range in the limited time-division system according to the power that receives data, realize rapid adjustment to automatic gain control value, the speed that the automatic gain control of raising is adjusted shortens the adjustment time.
Description of drawings
Fig. 1 is a block diagram of implementing the module of quickly adjusting automatic gain control value of the present invention.
Fig. 2 is a flow chart of implementing the method for quickly adjusting automatic gain control value of the present invention.
Embodiment
Below will describe the specific embodiment of the present invention by accompanying drawing.
As shown in Figure 1, the module according to quickly adjusting automatic gain control value of the present invention comprise initialization unit 100, overflow counter 101, overflow number of times comparing unit 102, automatic gain control step-length adjustment unit 103 and automatic gain control value adjustment unit 104.
Initialization unit 100 is used to be provided with the initial value of automatic gain control value and the initial value of automatic gain control step-length, and the value that the reception data are overflowed thresholding, automatic gain control value lower limit and the automatic gain control value upper limit is set.After the initialization, the initial value of automatic gain control value lower limit and automatic gain control value higher limit and automatic gain control value is admitted in the automatic gain control value adjustment unit 104, automatic gain control step-length initial value is admitted in the automatic gain control step-length adjustment unit 103, receives data and overflows thresholding and be admitted to and overflow in the number of times comparing unit 102.
Wherein, the automatic gain control value upper and lower bound is determined by the changing voltage bound that the front end analog-to-digital conversion module provides.Receiving data, to overflow the selection principle of the initial value of the initial value of the value of thresholding, described automatic gain control step-length and automatic gain control value be to make automatic gain control value can converge to stationary value quickly, generally next concrete definite according to concrete system.
Overflow counter 101, the reception data that are used in accumulative total time cycle are overflowed number of times, and overflow number of times and send into and overflow in the number of times comparison module 102 receiving data.
Overflow number of times comparing unit 102, be used for comparison and overflow the reception data that number of times and initialization unit 100 be provided with and overflow thresholding, and comparative result is sent to automatic gain control adjustment unit 103 and automatic gain control value adjustment unit 104 respectively by overflowing reception data that counter 101 imports into.
Automatic gain control adjustment unit 103 according to from the comparative result that overflows number of times comparing unit 102, is adjusted the automatic gain step-length, and adjusted automatic gain step-length is transferred to automatic gain control value adjustment unit 104.
Automatic gain control value adjustment unit 104 based on from the adjusted automatic gain step-length of automatic gain control adjustment unit 103 with from the comparative result that overflows number of times comparing unit 102, is adjusted current automatic gain control value.
According to an one exemplary embodiment of the present invention, (Time Division-SynchronousCode Division Multiple Access TD-SCDMA) in the sweep generator, according to the power that receives data, adjusts the AGC value in TD SDMA.The length of selected time cycle can not be oversize, can not be too short.If oversize, then can not accurately follow the variation of current channel; If too short, over-burden because amount of calculation is too big can to make system.In the present embodiment, be the time cycle with the subframe of a 5ms,
Fig. 2 shows the flow chart of the method for the quickly adjusting automatic gain control value of implementing present embodiment.
At first, the initial value of automatic gain control value and the initial value of automatic gain control step-length are set, and the value that the reception data are overflowed thresholding, automatic gain control value lower limit and the automatic gain control value upper limit are set.
Secondly, the data in the subframe of a 5ms of statistics are overflowed number of times.In the beginning of each subframe, overflow counter 101 zero setting.In each subframe, when the reception data power is bigger than normal, cause data to be overflowed easily.Data are overflowed once, overflow counter 101 and add one automatically.The value of overflowing counter is write down in ending in each subframe.
Then, receive relatively that data are overflowed number of times and data are overflowed thresholding, overflow number of times and overflow thresholding, then automatic gain control step-length is decreased to original 1/2 greater than data if receive data; Overflow number of times and be less than or equal to data and overflow thresholding if receive data, then automatic gain control step-length remains unchanged.
Next, adjust automatic gain control value.
If the reception data are overflowed number of times and are overflowed thresholding greater than data, the difference and the described automatic gain lower control limit value of more current automatic gain control value and automatic gain control step-length, if the difference of current automatic gain control value and described automatic gain control step-length is greater than described automatic gain lower control limit value, then the automatic gain control value of following one-period is set to the poor of current automatic gain control value and described automatic gain control step-length; If the difference of current automatic gain control value and described automatic gain control step-length is less than described automatic gain lower control limit value, then automatic gain control value is set to described automatic gain lower control limit value following one-period;
If receiving data overflows number of times and is less than or equal to data and overflows thresholding, more current automatic gain control value and automatic gain control step-length sum and automatic gain upper control limit value, if current automatic gain control value and automatic gain control step-length sum is greater than automatic gain upper control limit value, then automatic gain control value is set to automatic gain upper control limit value following one-period; If current automatic gain control value and automatic gain control step-length sum is less than automatic gain upper control limit value, then automatic gain control value is set to current automatic gain control value and automatic gain control step-length sum following one-period;
At last,, carry out the adjustment of next subframe, converge to stationary value until automatic gain control value based on the value that current adjustment obtains.
More than; with reference to accompanying drawing the specific embodiment of the present invention specific descriptions have been made; yet; those skilled in the art are to be understood that; do not departing under spirit of the present invention and the situation by the protection range that claims limited, those skilled in the art can also do various modifications to situation given in the embodiment.Therefore, should not be counted as limitation of the invention with reference to above-mentioned accompanying drawing to the embodiment description that the present invention did.
Claims (8)
1. the method for a quickly adjusting automatic gain control value is used for realizing the rapid adjustment to automatic gain control value according to the power that receives data, and described method comprises the steps: successively
Step 1): the initial value of automatic gain control value and the initial value of automatic gain control step-length are set, and the value that the reception data are overflowed thresholding, automatic gain control value lower limit and the automatic gain control value upper limit is set;
Step 2): in a time cycle, calculate described reception data and overflow number of times by overflowing counter;
Step 3): the described data that the described reception data comparison step 2) are overflowed in number of times and the step 1) are overflowed thresholding, if described reception data are overflowed number of times and overflowed thresholding greater than described data, then control step-length adjusting described automatic gain, and proceed to step 4); If described reception data are overflowed number of times and are less than or equal to described data and overflow thresholding, then described automatic gain control step-length remains unchanged, and proceeds to step 5);
Step 4): the difference and the described automatic gain lower control limit value of more current automatic gain control value and described automatic gain control step-length, if the difference of current automatic gain control value and described automatic gain control step-length is greater than described automatic gain lower control limit value, then the automatic gain control value of following one-period is set to the difference of current automatic gain control value and described automatic gain control step-length and proceeds to step 6); The difference of current automatic gain control value and described automatic gain control step-length is less than described automatic gain lower control limit value, and then automatic gain control value is set to described automatic gain lower control limit value and proceeds to step 6) following one-period;
Step 5): more current automatic gain control value and described automatic gain control step-length sum and described automatic gain upper control limit value, if current automatic gain control value and described automatic gain control step-length sum is greater than described automatic gain upper control limit value, then automatic gain control value is set to described automatic gain upper control limit value and proceeds to step 6) following one-period; If current automatic gain control value and described automatic gain control step-length sum is less than described automatic gain upper control limit value, then automatic gain control value is set to current automatic gain control value and described automatic gain control step-length sum and proceeds to step 6) following one-period;
Step 6): return step 2) to carry out the adjustment of next time cycle, converges to stationary value until automatic gain control value.
2. the method for quickly adjusting automatic gain control value as claimed in claim 1 is characterized in that, if described reception data are overflowed number of times and overflowed thresholding greater than described data, then reduces described automatic gain control step-length in proportion.
3. the method for quickly adjusting automatic gain control value as claimed in claim 1 is characterized in that, if described reception data are overflowed number of times and overflowed thresholding greater than described data, then adjusts described automatic gain step-length by index.
4. the method for quickly adjusting automatic gain control value as claimed in claim 1 is characterized in that, described automatic gain control value upper and lower bound is determined by the changing voltage bound that the front end analog-to-digital conversion module provides.
5. a module that realizes quickly adjusting automatic gain control value is used for realizing the rapid adjustment to automatic gain control value according to the power that receives data, and described module comprises:
Initialization unit (100) is used to be provided with the initial value of automatic gain control value and the initial value of automatic gain control step-length, and the value that the reception data are overflowed thresholding, automatic gain control value lower limit and the automatic gain control value upper limit is set;
Overflow counter (101), be used for interior reception data of time cycle of accumulative total and overflow number of times;
Overflow number of times comparing unit (102), be used for that more described reception data are overflowed number of times and described reception data are overflowed thresholding;
Automatic gain control step-length adjustment unit (103) is used for adjusting automatically the automatic gain step-length;
Automatic gain control value adjustment unit (104) is used for adjusting automatically automatic gain control value;
Wherein, described automatic gain control step-length adjustment unit (103) reduces described automatic gain control step-length when described reception data are overflowed number of times and overflowed thresholding greater than described data in proportion, overflows number of times in described reception data and is less than or equal to and does not change described automatic gain when described data are overflowed thresholding and control step-length;
Wherein, described automatic gain control value adjustment unit (104) is when described reception data are overflowed number of times and overflowed thresholding greater than described data, the difference of current automatic gain control value and described automatic gain control step-length during greater than described automatic gain lower control limit value the automatic gain control value of following one-period be set to the poor of current automatic gain control value and described automatic gain control step-length, the difference of current automatic gain control value and described automatic gain control step-length is less than described automatic gain lower control limit value, and then automatic gain control value is set to described automatic gain lower control limit value following one-period; Described automatic gain control value adjustment unit (104) overflows number of times in described reception data and is less than or equal to described data when overflowing thresholding, if current automatic gain control value and described automatic gain control step-length sum are greater than described automatic gain upper control limit value, then automatic gain control value is set to described automatic gain upper control limit value following one-period, if current automatic gain control value and described automatic gain control step-length sum is less than described automatic gain upper control limit value, then automatic gain control value is set to current automatic gain control value and described automatic gain control step-length sum following one-period.
6. the method for quickly adjusting automatic gain control value as claimed in claim 5 is characterized in that, if described reception data are overflowed number of times and overflowed thresholding greater than described data, then reduces described automatic gain control step-length in proportion.
7. the method for quickly adjusting automatic gain control value as claimed in claim 5 is characterized in that, if described reception data are overflowed number of times and overflowed thresholding greater than described data, then adjusts described automatic gain step-length by index.
8. the method for quickly adjusting automatic gain control value as claimed in claim 5 is characterized in that, described automatic gain control value upper and lower bound is determined by the changing voltage bound that the front end analog-to-digital conversion module provides.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101473549A CN101145816A (en) | 2007-09-05 | 2007-09-05 | Method and module for quickly adjusting automatic gain control value |
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| CNA2007101473549A CN101145816A (en) | 2007-09-05 | 2007-09-05 | Method and module for quickly adjusting automatic gain control value |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362068A (en) * | 2014-11-18 | 2015-02-18 | 聚光科技(杭州)股份有限公司 | Method for adjusting gain of electron multiplier |
| CN107919859A (en) * | 2016-10-07 | 2018-04-17 | 硅实验室公司 | The automatic growth control of amplifier gain is controlled based on the duration of overload conditions（AGC）Circuit and method |
-
2007
- 2007-09-05 CN CNA2007101473549A patent/CN101145816A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362068A (en) * | 2014-11-18 | 2015-02-18 | 聚光科技(杭州)股份有限公司 | Method for adjusting gain of electron multiplier |
| CN107919859A (en) * | 2016-10-07 | 2018-04-17 | 硅实验室公司 | The automatic growth control of amplifier gain is controlled based on the duration of overload conditions（AGC）Circuit and method |
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Open date: 20080319 |