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Gain control device

A technology of gain control and voltage control, which is applied in the direction of gain control, amplification control, analog signal digital control, etc., and can solve problems such as deterioration of call status, large fluctuation of receiving level, and incapable of high-precision A/D conversion.

Inactive Publication Date: 2002-08-21
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the conventional AGC, since the convergence coefficient is set between 0 and 1, for example, the reduction of shielding due to tunnel exits, building shadows, etc., high-speed fading, and reception problems caused by frequency switching in compressed mode When the reception level of a signal fluctuates greatly, it is necessary to bring the reception level quickly close to the target value, but in the conventional control, it takes a long time for the reception level to approach the target value, during which time A / D conversion cannot be performed with high precision , there is such a problem that the call state deteriorates
This problem can be solved by setting the convergence coefficient to 1 or more when the reception level of the received signal fluctuates greatly, but in this case, the power level of the output signal will diverge or oscillate, and will not converge to the target value The problem

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0018] figure 1 A block diagram showing the configuration of the gain control device according to Embodiment 1 of the present invention. As shown in the figure, the gain control device includes a gain control amplifier 101, an AD converter 102, an average value calculator 103, a convergence coefficient determiner 104, a logarithmic operator 105, a gain coefficient determiner 106, a gain / voltage converter 107, and a DA converter 108 . The convergence coefficient decider 104 includes a comparison circuit 104-A and a convergence coefficient selection circuit 104-B, and the gain coefficient decider 106 includes a differential value calculator 106-A, a multiplier 106-B, an adder 106-C, and a delayer 106 -D.

[0019] This gain control device calculates a control voltage for each symbol of the received signal, and controls the gain control amplifier 101 .

[0020] A gain control amplifier (hereinafter referred to as 'GCA') 101 amplifies a received signal based on a control voltage...

Embodiment 2

[0077] The gain control device of the second embodiment detects the deviation (difference value) between the reception level of the received signal and its target value, calculates a control voltage based on the detection result, and controls the gain of the amplifier based on the calculated control voltage. The control voltage for controlling the gain of the amplifier is calculated by multiplying the logarithm of the differential value by a convergence coefficient determined based on the reception level of the received signal, and multiplying the result of the multiplication with the control voltage at the previous control. Add to calculate the gain coefficient, and convert the obtained gain coefficient into the order of magnitude of the voltage. This convergence coefficient is determined by performing a predetermined threshold value determination using the number of samples that overflow or underflow occurs during digital conversion.

[0078] That is, the difference between ...

Embodiment 3

[0087] The gain control device of the third embodiment detects the deviation (difference value) between the reception level of the received signal and its target value, calculates a control voltage based on the detection result, and controls the gain of the amplifier based on the calculated control voltage. The control voltage for controlling the gain of the amplifier is calculated by multiplying the logarithm of the differential value by a convergence coefficient determined based on the reception level of the received signal, and multiplying the result of the multiplication with the control voltage at the previous control. Add to calculate the gain coefficient, and convert the obtained gain coefficient into the order of magnitude of the voltage. The convergence coefficient is determined by performing a predetermined threshold value determination using the reception level of the received signal.

[0088] That is, the difference between the third embodiment and the first embodi...

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Abstract

A convergence factor decision unit (104) threshold-judges an average value calculated by an average calculation unit (103) by using a predetermined threshold value, and determines a convergence factor. A gain factor decision unit (106) determines a control gain based on the convergence factor and the average value. A gain voltage conversion unit (107) converts a gain factor into voltage to determine a control voltage. A GCA (101) amplifies a received signal according to a digital-converted control voltage.

Description

technical field [0001] The present invention relates to a gain control device and a gain control method in CDMA (Code Division Multiple Access: Code Division Multiple Access) mobile communication. Background technique [0002] Generally, in mobile communications, automatic gain control (hereinafter referred to as 'AGC' (Automatic Gain Control)) is performed for the purpose of improving the accuracy of converting a received analog signal into a digital signal. This automatic gain control performs feedback control on the gain of the amplifier provided in the preceding stage of the AD converter so that the power level of the input signal of the AD converter converges to a preset convergence target value. The convergence target value is determined in advance according to the characteristics of the AD converter, and by controlling the gain of the amplifier, A / D conversion can be performed with high precision so that the power level of the input signal of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/20H03G3/00H03G3/30H03M1/18H04J13/00H04L27/01
CPCH03G3/001H03G3/30H03M1/185H04B7/005
Inventor 梶田邦之
Owner PANASONIC CORP