KR100266675B1 - Gain controlling method of automatic gain controller - Google Patents
Gain controlling method of automatic gain controller Download PDFInfo
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- KR100266675B1 KR100266675B1 KR1019980010174A KR19980010174A KR100266675B1 KR 100266675 B1 KR100266675 B1 KR 100266675B1 KR 1019980010174 A KR1019980010174 A KR 1019980010174A KR 19980010174 A KR19980010174 A KR 19980010174A KR 100266675 B1 KR100266675 B1 KR 100266675B1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
- H03L7/107—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth
- H03L7/1075—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth by changing characteristics of the loop filter, e.g. changing the gain, changing the bandwidth
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
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Abstract
본 발명은 자동이득제어기의 이득조절방법에 관한 것으로, 종래에는 오차값이 변화함에 따라 이득이 계속하여 바뀌게 되어 이득이 수렴하는데 걸리는 시간이 길어지는 문제점이 있었다. 따라서, 본 발명은 입력신호의 문턱치 및 목표파워를 설정하는 제1 단계와; 입력신호에 이득을 승산하여 입력파워를 구하고 그 입력파워의 절대값에 대한 누적평균파워를 구하는 제2 단계와; 새로운 이득이 설정되었는지를 판단하는 제3 단계와; 상기 제3 단계의 판단결과 새로운 이득이 설정되었으면 제1 단계로 궤환하고 새로운 이득이 설정되지 않았으면 입력파워의 절대값에 대한 누적평균파워가 문턱치를 일정시간동안 초과하는 지를 판단하는 제4 단계와; 상기 제4 단계의 판단결과 누적평균파워가 일정시간동안 문턱치를 초과하지 않으면 상기 제1 단계로 궤환하고 누적평균파워가 일정시간동안 문턱치를 초과하면 목표파워와 누적평균파워의 차이를 구하여 이를 오차값으로 설정하는 제5 단계와; 현재의 이득과 오차값을 승산하여 이를 누적평균파워로 나누고, 이 나눈값을 현재의 이득에 가산하여 이 가산값을 새로운 이득으로 설정하는 제6 단계로 수행하여 이득의 시작점을 찾아서 일정시간동안의 평균파워를 구한 후 이득을 결정하므로 이득의 수렴시간을 향상시킬 수 있는 효과가 있다.The present invention relates to a gain adjusting method of an automatic gain controller, and has conventionally had a problem in that the gain is continuously changed as the error value is changed, and the time taken for the gain to converge is long. Accordingly, the present invention provides a first step of setting a threshold and a target power of an input signal; A second step of obtaining an input power by multiplying a gain by an input signal and obtaining a cumulative average power of an absolute value of the input power; A third step of determining whether a new gain is set; A fourth step of determining whether the cumulative average power of the absolute value of the input power exceeds the threshold for a predetermined time if the new gain is set as a result of the determination of the third step and the new gain is not set; ; If the cumulative average power does not exceed the threshold for a predetermined time as a result of the determination of the fourth step, the feedback is returned to the first stage, and if the cumulative average power exceeds the threshold for a predetermined time, the difference between the target power and the cumulative average power is obtained and the error value Setting a fifth step; Multiply the current gain by the error value and divide it by the cumulative average power, and add this divided value to the current gain and set this addition value as a new gain to find the starting point of the gain. Since the gain is determined after the average power is obtained, the convergence time of the gain can be improved.
Description
본 발명은 자동이득제어기의 이득조절방법에 관한 것으로, 특히 이득이 빠른 수렴속도를 갖을 수 있도록 한 자동이득제어기의 이득조절방법에 관한 것이다.The present invention relates to a gain adjusting method of an automatic gain controller, and more particularly, to a gain adjusting method of an automatic gain controller in which a gain has a fast convergence speed.
일반적으로, 자동이득제어기는 빠른 수렴속도와 정확한 이득 설정이 중요한데, 모뎀과 같은 통신기기에서는 신호의 특성상 신호의 지속범위가 정해져 있고 이 동안에 이득이 설정이 완료되야하므로 정확한 이득조정보다는 빠른 수렴속도가 요구된다.In general, the automatic gain controller requires fast convergence speed and accurate gain setting.In a communication device such as a modem, the signal duration is determined due to the characteristics of the signal, and during this time, the gain must be completed. Required.
도1은 종래 자동이득제어기의 이득조절방법에 대한 흐름도로서, 이에 도시된 바와같이 자동이득제어기의 수렴속도를 조절하는 단계상수를 설정한 후 원하는 목표파워(Target Power)을 설정하는 제1 단계와; 입력신호(IN)에 이득(Gain)을 승산하여 이 승산값을 입력파워(IN_Power)로 구하는 제2 단계와; 입력파워(IN_Power)에 대한 누적평균파워(New Average_Power)를 구하는 제3 단계와; 목표파워(Target Power)와 입력파워(IN_Power)의 누적평균파워(New Average_Power)에 대한 차이를 오차값(Error)으로 구하는 제4 단계와; 현재의 이득(Gain)과 오차값(Error) 및 초기에 설정한 단계상수를 승산하여 이 승산값을 현재의 이득(Gain)에 더한후 상기 제2 단계로 궤환하는 제5 단계로 수행하며, 이와 같은 종래기술의 동작을 설명한다.1 is a flowchart illustrating a gain adjusting method of a conventional automatic gain controller. As shown in FIG. 1, a first step of setting a desired target power after setting a step constant for adjusting a convergence speed of an automatic gain controller is shown. ; A second step of multiplying the gain by the input signal IN to obtain the multiplication value as the input power IN_Power; Obtaining a cumulative average power (New Average_Power) for the input power (IN_Power); A fourth step of obtaining a difference between a target power and an input power IN_Power as a cumulative average power New New_Power as an error value; The multiplier multiplies the current gain, the error, and the initially set step constant, adds this multiplier to the current gain, and returns to the second step. The operation of the same prior art will be described.
먼저, 현재의 이득(Gain)에 의한 입력파워(IN_Power)를 계산하는데, 즉 자동이득제어기의 수렴속도를 조절하는 단계상수와 원하는 목표파워(Target Power)을 설정한 후 입력신호(IN)에 이득(Gain)을 승산하여 입력파워(IN_Power)를 구한다.First, the input power (IN_Power) is calculated by the current gain, that is, the step constant for adjusting the convergence speed of the automatic gain controller and the desired target power (Target Power) are set, followed by gain on the input signal (IN). Multiply (Gain) to get the input power (IN_Power).
이때, 고정 소수점연산을 사용하는 경우 이득(Gain)값의 다이나믹레인지를 입력신호(IN)의 8배로 하고 최초 이득(Gain)은 오버플로우를 방지하기 위하여 0.125로 한다.In this case, when using fixed-point arithmetic, the dynamic range of the gain value is set to 8 times the input signal IN, and the initial gain is set to 0.125 to prevent overflow.
그 다음, 이전의 평균파워(Average_Power)에 현재의 입력파워(IN_Power)를 누적하여 그에 따른 누적평균파워(New Average_Power)를 구한후, 상기 누적평균파워(New Average_Power)와 초기에 설정한 목표파워(Target Power)에 대한 차이를 오차값(Error)으로 구한다.Next, after accumulating the current input power IN_Power to the previous average power (Average_Power) to obtain the cumulative average power (New Average_Power) accordingly, the cumulative average power (New Average_Power) and the initially set target power ( The difference to the target power is calculated as an error value.
그 다음, 상기 오차값(Error)을 현재의 이득(Gain) 및 초기에 설정한 단계상수를 승산하여 이 승산값을 현재의 이득(Gain)에 가산하여 새로운 이득(Gain)을 구한다.Then, the error value is multiplied by the current gain and the initially set step constant to add this multiplication value to the current gain to obtain a new gain.
이후, 상기와 같은 과정을 반복 수행하여 이득(Gain)을 조정한다.Thereafter, the above process is repeated to adjust the gain.
그러나, 상기와 같은 종래 기술은 오차값이 변화함에 따라 이득이 계속하여 바뀌게 되어 이득이 수렴하는데 걸리는 시간이 길어지는 문제점이 있었다.However, the prior art as described above has a problem in that the gain is continuously changed as the error value is changed, and the time taken for the gain to converge is long.
따라서, 상기와 같은 문제점을 감안하여 창안한 본 발명은 이득의 시작점을 찾아서 일정시간동안의 평균파워를 구한 후 이득을 결정하여 이득의 수렴시간을 향상시킬 수 있도록 한 자동이득제어기의 이득조절방법을 제공함에 그 목적이 있다.Accordingly, the present invention devised in view of the above-mentioned problems provides a gain control method of an automatic gain controller that can improve the convergence time of gains by finding the starting point of the gains, obtaining the average power for a predetermined time, and determining the gains. The purpose is to provide.
도1은 종래 자동이득제어기의 이득조절방법에 대한 흐름도.1 is a flowchart illustrating a gain adjusting method of a conventional automatic gain controller.
도2는 본 발명 자동이득제어기의 이득조절방법에 대한 흐름도.Figure 2 is a flow chart for the gain adjustment method of the automatic gain controller of the present invention.
상기와 같은 목적을 달성하기 위한 본 발명은 입력신호의 문턱치 및 목표파워를 설정하는 제1 단계와; 입력신호에 이득을 승산하여 입력파워를 구하고 그 입력파워의 절대값에 대한 누적평균파워를 구하는 제2 단계와; 새로운 이득이 설정되었는지를 판단하는 제3 단계와; 상기 제3 단계의 판단결과 새로운 이득이 설정되었으면 제1 단계로 궤환하고 새로운 이득이 설정되지 않았으면 입력파워의 절대값에 대한 누적평균파워가 문턱치를 일정시간동안 초과하는 지를 판단하는 제4 단계와; 상기 제4 단계의 판단결과 누적평균파워가 일정시간동안 문턱치를 초과하지 않으면 상기 제1 단계로 궤환하고 누적평균파워가 일정시간동안 문턱치를 초과하면 목표파워와 누적평균파워의 차이를 구하여 이를 오차값으로 설정하는 제5 단계와; 현재의 이득과 오차값을 승산하여 이를 누적평균파워로 나누고, 이 나눈값을 현재의 이득에 가산하여 이 가산값을 새로운 이득으로 설정하는 제6 단계로 수행함을 특징으로 한다.The present invention for achieving the above object comprises a first step of setting the threshold and the target power of the input signal; A second step of obtaining an input power by multiplying a gain by an input signal and obtaining a cumulative average power of an absolute value of the input power; A third step of determining whether a new gain is set; A fourth step of determining whether the cumulative average power of the absolute value of the input power exceeds the threshold for a predetermined time if the new gain is set as a result of the determination of the third step and the new gain is not set; ; If the cumulative average power does not exceed the threshold for a predetermined time as a result of the determination of the fourth step, the feedback is returned to the first stage, and if the cumulative average power exceeds the threshold for a predetermined time, the difference between the target power and the cumulative average power is obtained and the error value Setting a fifth step; The sixth step is performed by multiplying the present gain and the error value by dividing it by the cumulative average power, and adding the divided value to the present gain to set this addition value as a new gain.
이하, 본 발명에 의한 자동이득제어기의 이득조절방법에 대한 작용 및 효과를 첨부한 도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings, the operation and effects of the gain control method of the automatic gain controller according to the present invention will be described in detail.
도2는 본 발명 자동이득제어기의 이득조절방법에 대한 흐름도로서, 이에 도시한 바와같이 입력신호(IN)의 문턱치(Th) 및 목표파워(Target Power)를 설정하는 제1 단계와; 입력신호(IN)에 이득(Gain)을 승산하여 입력파워(IN_Power)를 구하고 그 입력파워(IN_Power)의 절대값에 대한 누적평균파워(New Average_Power)를 구하는 제2 단계와; 새로운 이득(Gain)이 설정되었는지를 판단하는 제3 단계와; 상기 제3 단계의 판단결과 새로운 이득(Gain)이 설정되었으면 제1 단계로 궤환하고 새로운 이득(Gain)이 설정되지 않았으면 입력파워(IN_Power)의 절대값에 대한 누적평균파워(New Average_Power)가 문턱치(Th)를 일정 시간동안 초과하는지를 판단하는 제4 단계와; 상기 제4 단계의 판단결과 누적평균파워(New Average_Power)가 일정시간동안 문턱치(Th)를 초과하지 않았으면 상기 제1 단계로 궤환하고 누적평균파워(New Average_Power)가 일정시간동안 문턱치(Th)를 초과하면 목표파워(Target Power)와 누적평균파워(New Average_Power)의 차이를 구하여 이를 오차값(Error)으로 설정하는 제5 단계와; 현재의 이득(Gain)과 오차값(Error)을 승산하여 이를 누적평균파워(New Average_Power)로 나누고, 이 나눈값을 현재의 이득(Gain)에 가산하여 이 가산값을 새로운 이득(Gain)으로 설정하는 제6 단계로 수행하며, 이와같이 수행하는 본 발명의 동작을 설명한다.FIG. 2 is a flowchart illustrating a gain adjusting method of an automatic gain controller according to an embodiment of the present invention, in which a first step of setting a threshold Th and a target power of an input signal IN is shown; A second step of obtaining an input power IN_Power by multiplying a gain Gain by the input signal IN and obtaining a cumulative average power New Average_Power of an absolute value of the input power IN_Power; Determining whether a new gain has been set; If the new gain is set as a result of the determination of the third step, the feedback returns to the first step, and if the new gain is not set, the cumulative average power (New Average_Power) of the absolute value of the input power IN_Power is thresholded. A fourth step of determining whether (Th) is exceeded for a predetermined time; As a result of the determination in the fourth step, if the cumulative average power (New Average_Power) has not exceeded the threshold (Th) for a predetermined time, the feedback is fed back to the first step, and the cumulative average power (New Average_Power) returns the threshold (Th) for a predetermined time. A fifth step of obtaining a difference between a target power and a cumulative average power (New Average_Power) and setting it as an error value if exceeded; Multiply the current gain by the error and divide it by the new average_power, add this division to the current gain, and set this addition to the new gain. The sixth step is performed, and the operation of the present invention performed as described above will be described.
먼저, 초기에 입력신호(IN)의 문턱치(Th) 및 목표파워(Target Power)를 설정한 후, 현재의 이득(Gain)에 의한 입력파워(IN_Power)를 계산하는데, 즉 현재의 이득(Gain)과 입력신호(IN)를 승산하여 그에 따른 입력파워(IN_Power)를 구하고, 상기 입력파워(IN_Power)를 이전의 평균파워(Average_Power)에 누적시킨다.First, the threshold Th and the target power of the input signal IN are initially set, and then the input power IN_Power is calculated based on the current gain, that is, the current gain. Multiplying the input signal IN to obtain the corresponding input power IN_Power, and accumulating the input power IN_Power at the previous average power Average_Power.
이때, 상기 누적된 평균파워(New Average_Power)가 일정수준의 문턱치(Th)를 연속적으로 일정 시간동안 초과하는 경우에 반송파가 검출되는 것으로 판별하는데, 이 과정에서 고정소수점연산을 수행하는 경우 이득(Gain)값의 다이나믹 레인지를 확보하기 위해 입력신호(IN)의 스케일을 2배로 하고 최초 이득(Gain)은 0.5로 설정한다.In this case, the carrier is detected when the accumulated average power (New Average_Power) continuously exceeds a predetermined threshold value (Th) for a predetermined time, and the gain (Gain) when performing the fixed-point operation in this process To secure the dynamic range of the value, the scale of the input signal (IN) is doubled and the initial gain is set to 0.5.
이후, 만약 새로운 이득(Gain)이 설정되었으면 상기의 과정을 반복하여 수행하고, 새로운 이득(Gain)이 설정되지 않았으면 일정 시간동안 문턱치(Th)를 초과한 누적평균파워(New Average_Power)와 목표파워(Target Power)의 차이를 구하여 이를 오차값(Error)으로 설정한후, 상기 오차값(Error)을 현재의 이득(Gain)과 승산하여 이 승산값을 누적평균파워(New Average_Power)로 나누고, 이 나눈값을 현재의 이득(Gain)에 가산하여 이 가산값을 새로운 이득(Gain)으로 설정한다.After that, if the new gain is set, the above process is repeated. If the new gain is not set, the cumulative average power (New Average_Power) and the target power exceeding the threshold (Th) for a predetermined time period. After obtaining the difference of (Target Power) and setting it as an error value, the error value is multiplied by the current gain, and this multiplication value is divided by the cumulative average power (New Average_Power). The divided value is added to the current gain to set this addition as a new gain.
이상에서 상세히 설명한 바와같이 본 발명은 이득의 시작점을 찾아서 일정시간동안의 평균파워를 구한 후 이득을 결정하므로 이득의 수렴시간을 향상시킬 수 있는 효과가 있다.As described in detail above, the present invention has the effect of improving the convergence time of the gain because the gain is determined after finding the starting point of the gain to obtain the average power for a predetermined time.
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