Device and method for automatically controlling transmission power
First Claim
1. A device for automatically controlling transmission power of a site in a mobile communication system, comprising:
- at least one digital processor for encoding transmission data of a respective transmission channel;
a transmitter for converting, filtering and amplifying a signal output from said digital processor;
a power amplifier for amplifying a signal output from the transmitter to propagate amplified transmission data of the respective transmission channel via an antenna;
a variable attenuator interposed between said transmitter and said power amplifier, for varying the signal output from said transmitter to be transmitted to said power amplifier;
a power measurer for measuring a current transmission power of said power amplifier;
a detector for comparing a calculated value of the normal transmission power of said power amplifier with a measurement value of the current transmission power of said power amplifier to obtain an error power therefrom;
a power controller for comparing an absolute value of said error power with a permissible variation, to control said variable attenuator in response to the comparison result; and
a coupler for coupling said power amplifier to said power measurer.
1 Assignment
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Accused Products
Abstract
A device and method for automatically controlling transmission power of a CDMA site, by automatically controlling high frequency power of the CDMA site. The circuit for automatically controlling transmission power of a site in a CDMA mobile communication system, including: at least, one digital processing unit for encoding data on a transmission channel; a transmitter for converting, filtering and amplifying a signal output from the digital processor; a power amplifier for amplifying transmission data to propagate the amplified data in the air; a variable attenuator interposed between the transmitter and the power amplifier, for varying data output from the transmitter to be transmitted to the power amplifier; a power measurer for measuring the transmission power from the power amplifier; a detector for comparing a calculated value of the transmission power with a measurement value of the transmission power to obtain an error power therefrom; a power controller for comparing an absolute value of the error power with a predetermined permissible variation, to control the variable attenuator in association with the comparison result; and a coupler for coupling the power amplifier to the power measurer.
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Citations
20 Claims
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1. A device for automatically controlling transmission power of a site in a mobile communication system, comprising:
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at least one digital processor for encoding transmission data of a respective transmission channel; a transmitter for converting, filtering and amplifying a signal output from said digital processor; a power amplifier for amplifying a signal output from the transmitter to propagate amplified transmission data of the respective transmission channel via an antenna; a variable attenuator interposed between said transmitter and said power amplifier, for varying the signal output from said transmitter to be transmitted to said power amplifier; a power measurer for measuring a current transmission power of said power amplifier; a detector for comparing a calculated value of the normal transmission power of said power amplifier with a measurement value of the current transmission power of said power amplifier to obtain an error power therefrom; a power controller for comparing an absolute value of said error power with a permissible variation, to control said variable attenuator in response to the comparison result; and a coupler for coupling said power amplifier to said power measurer. - View Dependent Claims (2, 3, 4, 6, 7, 8, 9)
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5. A method for automatically controlling transmission power of a site in a mobile communication system including a high frequency power transmitter, a power amplifier, a power measurer, a detector, a power controller, and a variable attenuator interposed between said high frequency power transmitter and said power amplifier, comprising the steps of:
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calculating a transmission power of said power amplifier at a steady operation state by said detector to generate a calculated value of the steady-state transmission power; measuring a current transmission power of said power amplifier to generate a measurement value of the transmission power; detecting an error power by subtracting said calculated value from said measurement value; comparing an absolute value of said error power with a permissible variation; controlling said variable attenuator in accordance with said error power when said absolute value of the error power is higher than said permissible variation; and storing said error power when said absolute value of the error power is lower than said permissible variation, and controlling said variable attenuator in accordance with said stored error power. - View Dependent Claims (10, 11, 12)
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13. A device for automatically controlling transmission power of a transmission site in a mobile communication system, comprising:
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at least one digital processor for processing an information signal of a respective channel; a transmitter for modulating said information signal from said digital processor to produce a transmission signal for transmission via an antenna; a power amplifier for amplifying said transmission signal for transmission at a desirable transmission power via said antenna; a variable attenuator disposed between said transmitter and said power amplifier, for attenuating said transmission signal output from said transmitter before amplification by said power amplifier in accordance with an error power value to adjust the transmission power of said transmission signal from said power amplifier before transmission via said antenna; a power controller for automatically adjusting the transmission power of said transmission signal by providing said error power value to said variable attenuator; and a transmission power setting unit connectable to said power controller and a coupler coupling between said power amplifier and said antenna during the setting of said transmission site, for measuring an intensity of a current transmission power of said power amplifier to produce a measurement value reflecting the intensity of the current transmission power of said power amplifier, and comparing said measurement value with a known value of normal transmission power to produce said error power value. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification