CN100361400C - Radio frequency receiving channel automatic gain control method - Google Patents
Radio frequency receiving channel automatic gain control method Download PDFInfo
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- CN100361400C CN100361400C CNB2003101033112A CN200310103311A CN100361400C CN 100361400 C CN100361400 C CN 100361400C CN B2003101033112 A CNB2003101033112 A CN B2003101033112A CN 200310103311 A CN200310103311 A CN 200310103311A CN 100361400 C CN100361400 C CN 100361400C
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Abstract
The present invention discloses an automatic gain control method of a radio frequency receiving channel, which comprises the steps: a, a power value is preset, and the power value is more than a corresponding power value of output signals when the power of input signals is a thermal noise level of a receiver; b, the present invention judges whether the power of input signals of the radio frequency receiving channel is equal to a level value of a cell, which is not interfered by services. If the power is equal to the level value, a step c is executed. Otherwise, steps terminate; c, the present invention judges whether the power of output signals of the radio frequency channel corresponding to the level value of a cell, which is not interfered by services, is more than the preset power value. If the power is more than the preset power value, gains of the radio frequency channel are decreased and the power of the output signals of the radio frequency receiving channel is adjusted to be the preset power value. When the power of the input signals achieves the level value of a cell, which is not interfered by services, the output power is adjusted to be the power of output information corresponding to the thermal noise level of the receiver to ensure that the gains of the radio frequency channel are not adjusted in 90% of loads. The present invention solves the problem that the calculation accuracy of ascending loads is decreased due to adjusting the gains of the radio frequency channel.
Description
Technical field
The control technology that the present invention relates to gain is meant a kind of control method of radio frequency reception channel automatic gain especially.
Background technology
Referring to shown in Figure 1, the radio communication receiving system comprises antenna, radio frequency reception channel and data signal processing unit.In the radio communication receiving system, radio frequency reception channel is handled the electromagnetic signal of antenna induction, and the signal after the processing carries out digital processing again.Receiving dynamic requirements than under the condition with higher, radio frequency reception channel often adopts automatic gain control (AGC) technology, and this technology can reduce the dynamic requirements of A/D converter.
Referring to shown in Figure 2, receiver AGC controlling models comprises receiving front-end 201, controllable gain device 202, radio frequency amplifying unit 203, A/D converting unit 204, digital signal processing unit 205 and received signal intensity computing module 206.Under initial condition, the gain of controllable gain device is 1.After receiving front-end 201 receives the radiofrequency signal that antenna sends, with radiofrequency signal input radio frequency amplifying unit 203, radiofrequency signal inputs to A/D converter 204 after amplifying, and being converted to digital signal through A/D converter 204, this digital signal inputs to digital signal processing unit 205 again and handles; Simultaneously, two threshold value A and B are set in the control algolithm of received signal intensity computing module 206, and A＞B, received signal intensity computing module 206 utilizes the digital signal of digital signal processing unit 205 outputs, calculate the intensity of D point received signal, reduce the radio-frequency channel gain if D point signal during greater than threshold value A, is just regulated the controllable gain device, if during less than threshold value B, then regulating the controllable gain device, D point signal increases the radio-frequency channel gain.
The basic control scheme of controlling models shown in Figure 2 is referring to shown in Figure 3, and wherein, transverse axis is represented the input signal power of receiving front-end, and the longitudinal axis is represented the output signal power of radio-frequency channel.When the input signal of receiving front-end reached the thermal noise level of receiver, the output signal power of radio-frequency channel was the D value.
Its basic control principle is: two threshold value A and B are set in the control algolithm of module 206, and A＞B, module 206 constantly detects the output signal power of radio-frequency channel.At (P1, P2) in the interval, along with the input signal power of receiving front-end constantly increases, the output signal power of radio-frequency channel is also in continuous increase, when the output signal power of receiving front-end is increased to the A value, adjust output signal power, output signal power is reduced A-B, output signal power arrives B; When the output signal power of receiving front-end during less than the B value, adjust output signal power, the output signal power of radio-frequency channel is increased A-B, output signal power arrives A.When the input signal power of receiving front-end reached the P2 shown in the figure, P3, P4 point, the gain of the passage of radio frequency was all once adjusted.
According to above-mentioned analysis as can be known, when system did not have business, the input signal power of receiving front-end was constant, and the radio-frequency channel gain is constant.And, when input signal power reaches P3, P4, just need adjust the radio-frequency channel gain by module 202 along with the rising of traffic carrying capacity.
Need to prove that in the WCDMA system, RTWP equals the poor of radio-frequency channel output signal power and radio-frequency channel gain, and calculates NoiseRise, the variation of last computing system load by calculating RTWP.The calculating of ascending load as shown in Equation (1).
Wherein, I
TOTTotal interference level of receiving of expression base station comprises no professional interference level and owing to the user increases the interference level of generation, and the RTWP level that the WCDMA system reports is I
TOTP
NRepresent no professional interference level, η
ULThe expression load factor.
Can be calculated by formula (1): the total interference level that receives when the base station does not have professional interference level P relatively
NDuring rising 3dB, η
UL=0.5, i.e. 50% load refers generally to the P4 point; The total interference level that receives when the base station does not have professional interference level P relatively
NDuring rising 6dB, η
UL=0.75, i.e. 75% load; The total interference level that receives when the base station does not have professional interference level P relatively
NDuring rising 10dB, η
UL=0.90, i.e. 90% load.Generally speaking, the load of WCDMA system mainly changes between 50%～90%, and general load is as long as in 90% ascending load, and the ascending load precision is higher, just can satisfy the requirement of system's control.Generally, the total interference level dynamic change in the 10dB scope that receives in the base station, for satisfying the requirement of system, the load precision is less than ± 0.5dB.
In sum, because the adjustment of each radio-frequency channel gain, the capital produces adjusts error, and the required precision of ascending load is less than ± 0.5dB, if so input signal power instability, the radio-frequency channel gain will constantly be adjusted, and the adjustment curve can be at P2, P3 or P4 point bob.At this moment, every adjustment once gains, the error of generation ± 0.5dB, and its error range may all can surpass ± 0.5dB, so the computational accuracy of ascending load reduces.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of radio frequency reception channel auto gain control method, make it when adjusting the radio-frequency channel gain, reduce influence the ascending load computational accuracy.
A kind of radio frequency reception channel auto gain control method of the present invention comprises:
A. predetermined threshold value A, B, radio-frequency channel amount of gain adjustment X and performance number, and A＞B, 0＜X＜A-B, pairing output signal power value when this performance number is the receiver thermal noise level greater than the input signal power of radio frequency reception channel;
B. relatively the input signal power and the sub-district that receive of radio frequency reception channel do not have professional interference level value, if equal, and execution in step c then; If greater than, execution in step d then; Otherwise, process ends;
C. judge that whether described sub-district do not have the pairing radio frequency reception channel output signal power of professional interference level value greater than described predefined performance number, if greater than, then reduce the radio-frequency channel gain, the radio frequency reception channel output signal power is adjusted to described predefined performance number, and process ends; Otherwise, process ends;
When d. the input signal power that receives when radio frequency reception channel increases gradually, whether judge the radio frequency reception channel output signal power greater than threshold value A, if greater than, output signal power is reduced X, and the number of times of radio-frequency channel gain adjusted in record; Otherwise, do not handle;
When the input signal power that receives when radio frequency reception channel reduces gradually, judge the radio frequency reception channel output signal power whether or (A+B)/2 less than threshold value B, if less than, execution in step e then; Otherwise, do not handle process ends;
Whether the adjustment number of times of e. judging the radio-frequency channel gain is 0, if be 0, does not then handle; Otherwise, increasing the radio-frequency channel gain, recruitment is X, and the adjustment number of times of radio-frequency channel gain is set to 0, process ends.
When the input signal power of radio frequency reception channel did not have professional interference level value less than the sub-district, before process ends, this method further comprised among the step b:
Radio frequency reception channel output signal power and threshold value are compared, when the input signal power of radio frequency reception channel reception increases gradually, if the radio frequency reception channel output signal power reduces X greater than threshold value A with output signal power;
When the input signal power of radio frequency reception channel reception reduces gradually,,, do not handle if between A and B if the radio frequency reception channel output signal power increases X less than threshold value B with output signal power.
When the input signal power of radio frequency reception channel did not have professional interference level value less than the sub-district, before process ends, this method further comprised among the step b:
D30, set in advance radio-frequency channel amount of gain adjustment X for (A-B)/2;
D31, when the input signal power that receives in radio frequency reception channel increases gradually, whether judge the radio frequency reception channel output signal power greater than threshold value A, if greater than, the radio-frequency channel gain adjusted, with output signal power minimizing (A-B)/2;
When the input signal power of radio frequency reception channel reception reduces gradually, if the radio frequency reception channel output signal power less than threshold value (A+B)/2, increases (A-B)/2 with output signal power, otherwise, do not handle process ends.
Described radio-frequency channel amount of gain adjustment X is (A-B)/2; Describedly judge that whether the radio frequency reception channel output signal power less than threshold value B or (A+B)/2 is:
Judge that whether the radio frequency reception channel output signal power is less than threshold value (A+B)/2.
Preestablish described in the step a performance number for greater than and pairing output signal power value when being tending towards equaling the receiver thermal noise level.
The present invention is when input signal power reaches the sub-district and do not have professional interference level value, power output adjusted to be tending towards near the pairing output information power of receiver thermal noise level, guaranteeing in 90% load, no longer to adjust the radio-frequency channel gain, thereby solved the problem that the ascending load computational accuracy reduction that causes is adjusted in the gain of in the prior art because radio-frequency channel.
Description of drawings
Fig. 1 is a wireless receiving passage principle schematic;
Fig. 2 is a wireless receiving passage AGC principle schematic in the prior art;
Fig. 3 is the performance plot of AGC principle control radio-frequency channel in the prior art;
Fig. 4 is the method flow diagram of radio-frequency channel of the present invention automatic gain control;
Fig. 5 controls the performance plot of radio-frequency channel specific embodiment one for the present invention;
Fig. 6 controls the performance plot of radio-frequency channel specific embodiment two for the present invention.
Embodiment
In order to solve in the process of adjusting the radio-frequency channel gain, the problem that the ascending load computational accuracy reduces, the present invention no longer adjusts the radio-frequency channel gain in 90% ascending load.
Referring to shown in Figure 4, realize that the detailed process of the inventive method is as follows:
Step 401: preestablish performance number, and this performance number pairing output signal power when being the receiver thermal noise level greater than input signal power;
Step 402: whether the input signal power of judging radio frequency reception channel equals the sub-district is not had professional interference level value, if equal, then execution in step 403, otherwise, jump out this flow process;
Step 403: judge that whether described sub-district do not have the pairing radio-frequency channel of professional interference level value output signal power greater than described predefined performance number, if greater than, then reduce the radio-frequency channel gain, the output signal power of radio frequency reception channel is adjusted to described predefined performance number, otherwise, jump out this flow process.
Describe technical scheme of the present invention in detail below in conjunction with the drawings and specific embodiments.
Below two present embodiments be that threshold value A, B are set in module 206, the adjustment amount of radio-frequency channel gain is X, the span of X is 0＜X＜A-B.When the receiver thermal noise level was P1, the radio-frequency channel output signal power was D.In addition, set the performance number C bigger several decibels, make output signal can not cause error code owing to the thermal noise and the quantizing noise of module 206 than D.Module 206 constantly detects the radio-frequency channel output signal powers, when output signal power during greater than the A thresholding, reduces the radio-frequency channel gain, and this moment, decrease was A-X; When output signal power during less than the B thresholding, increase the radio-frequency channel gain, recruitment is X-B.When the input signal power of receiving front-end is sub-district when not having professional interference level, be the P4 point, whether judge the corresponding radio-frequency channel output signal power F of this point greater than C, if greater than C, then reduce the radio-frequency channel gain, output signal power is adjusted to C.And, write down the minimizing number of times of radio-frequency channel gain.When the input signal of receiving front-end reduces gradually, if more than no professional interference level, carried out reducing the control of passage, improve the radio-frequency channel gain so, be 0 if the radio-frequency channel gain reduces number of times, then do not adjust the radio-frequency channel gain.
Be example with X=(A-B)/2 below, and technical scheme of the present invention be described in conjunction with Fig. 5.
Referring to shown in Figure 5, P3, P4, P6 are that point is adjusted in the gain of signal when increasing gradually, and P2, P5 are that point is adjusted in the gain of signal when reducing gradually.
Between P1～P3 point: under initial condition, along with the input signal power of receiving front-end constantly increases, the radio-frequency channel output signal power is also in continuous increase.When the input signal power of receiving front-end arrives the P3 point, when the radio-frequency channel output signal power is increased to above threshold value A, module 206 will be adjusted the radio-frequency channel gain, and the radio-frequency channel gain is reduced (A-B)/2, i.e. c point.
If also in continuous increase, the radio-frequency channel output signal power is also in continuous increase so at the input signal power of c point receiving front-end.When the input signal power of receiving front-end is increased to the P4 point, when promptly equaling the sub-district and not having professional interference level, judge that the radio-frequency channel output signal power whether greater than power C value, if greater than the C value, then adjusts to C with the radio-frequency channel output signal power.After this, along with the continuous increase of receiving front-end input signal power, the radio-frequency channel gain is no longer adjusted, and when the radio-frequency channel output signal power surpassed AdBm, promptly the P6 point was adjusted once more, and module 206 will write down the number of times that reduces the radio-frequency channel gain.And, if at the input signal power of receiving front-end during greater than the P6 point, the input signal power of receiving front-end is in continuous minimizing, when output signal power during less than (A+B)/2, adjusting number of times in the above radio frequency reception channel gain of no professional interference level is 1, then increase the radio-frequency channel gain, output signal power is adjusted to the f point, the radio frequency reception channel gain is adjusted number of times and is set to 0 then.
If the input signal power at c point receiving front-end is reducing gradually, the radio-frequency channel output signal power is also in continuous reduction so.When input signal power arrived P2 point, the radio-frequency channel output signal power was during less than BdBm, and module 206 increases (A-B)/2 with the radio-frequency channel output signal power, radio-frequency channel output signal power arrival h point.Along with the input signal power of receiving front-end reducing gradually, the radio-frequency channel output signal power is also in continuous reduction then.
Lift two pairs of technical schemes of the present invention of specific embodiment below and remake description.
As shown in Figure 6, the receiver thermal noise level is P1, corresponding radio-frequency channel output signal power is D, two threshold value A and B are set in the control algolithm of module 206, set a level value C in addition, C generally is higher than the several decibels of D, guarantees can not cause error code because of the thermal noise of receiving system itself in the C level.
Between P1～P3 point: under initial condition, module 206 constantly detects the radio-frequency channel output signal powers, when signal power during greater than the A thresholding, reduces gain (A-B)/2, radio-frequency channel, output signal power is adjusted to (A+B)/2; Then, along with the continuous increase of input signal power, output signal power is also in continuous increase.
When input signal power arrives the P4 point, whether judge radio-frequency channel output signal power F greater than C, if greater than, then adjust the radio-frequency channel gain, make the radio-frequency channel output signal power near CdBm, otherwise, do not adjust.
Subsequently, continuous increase along with the receiver received signal power, output signal power is also in continuous increase, surpass AdBm up to the radio-frequency channel output signal power, it is the P6 point, adjust once more, output signal power is adjusted to (A+B)/2, this moment, 206 modules will write down the number of times that reduces the radio-frequency channel gain.
When the input signal power value that the input signal power of receiving front-end is ordered greater than P6, if the input signal power of receiving front-end reduces gradually, when output signal power during less than (A+B)/2, judge whether the number of times that reduces the radio-frequency channel gain is 0, the number of times that reduces the radio-frequency channel gain this moment is not 0, so will increase the radio-frequency channel gain, output signal power is adjusted to A, the adjustment number of times that reduces the radio-frequency channel gain is set to 0.Subsequently, along with the input signal power of receiving front-end reduces gradually, output signal power is in continuous minimizing, and when output signal power during less than (A+B)/2, the adjustment number of times that reduces the radio-frequency channel gain this moment is 0, so the radio-frequency channel gain does not need to adjust.
Difference between embodiment two and the embodiment one is: when input signal power reduced, gain was adjusted slightly different.But all be input signal at receiving front-end when reaching the sub-district and not having professional interference level, if whether the output signal power of determining this moment greater than C value, then adjusts to output signal power C value greater than predefined C value.Therefore before the input signal power of receiving front-end arrives threshold value A, need not adjust the radio-frequency channel gain again.
Need to prove that in above-mentioned two embodiment, the processing procedure of the gain between P1～P2 does not belong to adjusting range of the present invention.
Claims (5)
1, a kind of radio frequency reception channel auto gain control method is characterized in that, this method may further comprise the steps:
A. predetermined threshold value A, B, radio-frequency channel amount of gain adjustment X and performance number, and A＞B, 0＜X＜A-B, pairing output signal power value when this performance number is the receiver thermal noise level greater than the input signal power of radio frequency reception channel;
B. relatively the input signal power and the sub-district that receive of radio frequency reception channel do not have professional interference level value, if equal, and execution in step c then; If greater than, execution in step d then; Otherwise, process ends;
C. judge that whether described sub-district do not have the pairing radio frequency reception channel output signal power of professional interference level value greater than described predefined performance number, if greater than, then reduce the radio-frequency channel gain, the radio frequency reception channel output signal power is adjusted to described predefined performance number, and process ends, otherwise, process ends;
When d. the input signal power that receives when radio frequency reception channel increases gradually, whether judge the radio frequency reception channel output signal power greater than threshold value A, if greater than, output signal power is reduced X, and the number of times of radio-frequency channel gain adjusted in record; Otherwise, do not handle;
When the input signal power that receives when radio frequency reception channel reduces gradually, judge the radio frequency reception channel output signal power whether or (A+B)/2 less than threshold value B, if less than, execution in step e then; Otherwise, do not handle process ends;
Whether the adjustment number of times of e. judging the radio-frequency channel gain is 0, if be 0, does not then handle; Otherwise, increasing the radio-frequency channel gain, recruitment is X, and the adjustment number of times of radio-frequency channel gain is set to 0, process ends.
2, method according to claim 1 is characterized in that, when the input signal power of radio frequency reception channel did not have professional interference level value less than the sub-district, before process ends, this method further comprised among the step b:
Radio frequency reception channel output signal power and threshold value are compared, when the input signal power of radio frequency reception channel reception increases gradually, if the radio frequency reception channel output signal power reduces X greater than threshold value A with output signal power;
When the input signal power of radio frequency reception channel reception reduces gradually,,, do not handle if between A and B if the radio frequency reception channel output signal power increases X less than threshold value B with output signal power.
3, method according to claim 1 is characterized in that, when the input signal power of radio frequency reception channel did not have professional interference level value less than the sub-district, before process ends, this method further comprised among the step b:
D30, set in advance radio-frequency channel amount of gain adjustment X for (A-B)/2;
D31, when the input signal power that receives in radio frequency reception channel increases gradually, whether judge the radio frequency reception channel output signal power greater than threshold value A, if greater than, the radio-frequency channel gain adjusted, with output signal power minimizing (A-B)/2;
When the input signal power of radio frequency reception channel reception reduces gradually, if the radio frequency reception channel output signal power less than threshold value (A+B)/2, increases (A-B)/2 with output signal power, otherwise, do not handle process ends.
4, method according to claim 1 is characterized in that, described radio-frequency channel gain X is (A-B)/2,
Describedly judge that whether the radio frequency reception channel output signal power less than threshold value B or (A+B)/2 is: judge that whether the radio frequency reception channel output signal power is less than threshold value (A+B)/2.
5, method according to claim 1 is characterized in that, preestablish described in the step a performance number for greater than and pairing output signal power value when being tending towards equaling the receiver thermal noise level.
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| CNB2003101033112A CN100361400C (en) | 2003-10-28 | 2003-10-28 | Radio frequency receiving channel automatic gain control method |
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| CN100361400C true CN100361400C (en) | 2008-01-09 |
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| CN103517395B (en) * | 2012-06-21 | 2017-12-26 | 中兴通讯股份有限公司 | The implementation method and device of automatic growth control |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193424A (en) * | 1995-06-30 | 1998-09-16 | 艾利森电话股份有限公司 | Adaptive gain controller |
| CN1260634A (en) * | 1999-01-08 | 2000-07-19 | 松下电器产业株式会社 | Automatic gain controlling method and apparatus |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193424A (en) * | 1995-06-30 | 1998-09-16 | 艾利森电话股份有限公司 | Adaptive gain controller |
| CN1260634A (en) * | 1999-01-08 | 2000-07-19 | 松下电器产业株式会社 | Automatic gain controlling method and apparatus |
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