Transmission power control system and method for a mobile station
First Claim
1. A transmission power control system, comprising:
- a transmitter that receives a modulated signal and outputs a transmission power signal based on a gain difference control signal;
a power detector that transforms said transmission power signal into a DC voltage;
a mobile station modem that outputs a first, second, third and fourth gain control values, respectively, based on the DC voltage; and
a gain difference controller that generates said gain difference control signal and applies said gain difference control signal to said transmitter in accordance with said first gain control value and an attenuated signal,wherein said gain difference controller comprises,an attenuator that attenuates said DC voltage based on said third gain control value and outputs said attenuated signal,a comparator that generates a difference between said first gain control value and said attenuated signal, andan adding circuit that generates said gain difference control signal by adding said difference and said fourth gain control value.
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Accused Products
Abstract
A transmission power control system and method is provided that controls the magnitude of transmission power in proportion to the distance between a base station and a mobile station. The transmission power control system provides the exact transmission power by compensating for an error between a real gain and a gain controlled value according to the magnitude of the transmission power. The transmission power control system can be used, for example, in a mobile phone. The transmission power control system can include a transmission part, a mobile station modem, a power detector, a gain difference controlling part and a power amplifier controlling part. The transmission part outputs a transmission power signal in accordance with input signals. The power detector transforms the transmission power signal into a DC voltage. The mobile station modem outputs a first and second gain control values, respectively, based on the DC voltage. The gain difference controlling part generates a gain difference control signal and applies the gain difference control signal to the transmission part in accordance with the first gain control value and an attenuated signal. The power amplifier controlling part outputs a power amplifier gain control value to the transmission part in accordance with the DC voltage and the second gain control value.
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Citations
20 Claims
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1. A transmission power control system, comprising:
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a transmitter that receives a modulated signal and outputs a transmission power signal based on a gain difference control signal; a power detector that transforms said transmission power signal into a DC voltage; a mobile station modem that outputs a first, second, third and fourth gain control values, respectively, based on the DC voltage; and a gain difference controller that generates said gain difference control signal and applies said gain difference control signal to said transmitter in accordance with said first gain control value and an attenuated signal, wherein said gain difference controller comprises, an attenuator that attenuates said DC voltage based on said third gain control value and outputs said attenuated signal, a comparator that generates a difference between said first gain control value and said attenuated signal, and an adding circuit that generates said gain difference control signal by adding said difference and said fourth gain control value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A transmission power control system, comprising:
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a transmitter that receives and outputs a transmission power signal based on input signals; a power detector that transforms said transmission power signal into a representative value; a mobile station modem that outputs a first and second gain control values, respectively, based on the representative value; a gain difference controller that generates a gain difference control signal and applies said gain difference control signal to said transmitter in accordance with said first gain control value and an attenuated signal; and a power amplifier controller that outputs a third gain control value to said transmitter in accordance with said representative value and said second gain control value wherein the attenuated signal is based on the representative value and a fourth gain control value from the mobile station modem. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of controlling a transmission power control system, comprising:
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receiving a modulated signal and outputting a transmission power signal based on a gain difference control signal using a power transmitter; transforming said transmission power signal into a representative DC voltage; outputting a first, second, third and fourth gain control values, respectively, based on the DC voltage using a mobile station modem; outputting a power amplifying gain control value to said power transmitter in accordance with said DC voltage and said second gain control value; and generating a gain difference control signal and applying said gain difference control signal to said modulated signal in accordance with said first gain control value and an attenuated signal, wherein said generating a gain difference control signal comprises attenuating said DC voltage based on said third gain control value and outputting said attenuated signal, generating a difference between said first gain control value and said attenuated signal, and outputting said gain difference control signal by adding said difference and said fourth gain control value.
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18. A transmission power control system, comprising:
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a transmitter that receives and outputs a transmission power signal based on input signals; a power detector that transforms said transmission power signal into a representative value; a mobile station modem that outputs first and second gain control values, respectively, based on the representative value; a gain difference controller that generates a gain difference control signal and applies said gain difference control signal to a first amplifier of the transmitter in accordance with said first gain control value and an attenuated signal; and a power amplifier controller that outputs a third gain control value to a second amplifier of the transmitter in accordance with said representative value and said second gain control value, wherein said transmitter comprises, said first amplifier that receives said modulated signal and said gain difference control signal, a mixer that mixes a local oscillation signal with the output of said first amplifier, a pre-amplifier that amplifies the mixed signal to a predetermined magnitude, and said second amplifier that receives said third gain control signal and amplifies the pre-amplified signal to the transmission power signal. - View Dependent Claims (19, 20)
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Specification