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US 8,509,714 B2Granted
Bias modulation apparatus, and apparatus and method for transmitting signal for wideband mobile communication using the same
AssigneeElectronics and Telecommunications Research Institute
InventorsJoon Hyung Kim, Kwang Chun Lee
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Abstract
In a wideband mobile communication system, a signal transmitting apparatus separates an envelope curve signal which is size information and a phase signal which is phase information from a signal to transmit, and compares the envelope curve signal with a predetermined voltage. The signal transmitting apparatus performs active bias control that amplifies and outputs an envelope curve signal according to different driving voltages based on a comparison result, and supplies a bias voltage to a power amplifier that amplifies a phase signal based on the amplified signal.
Claims10
A signal transmitting apparatus comprising:
- a polar coordinate converter that separates and outputs an envelope curve signal which is size information and a phase signal which is phase information from a signal to be transmitted;
- an up-converter in communication with the polar coordinate converter that up-converts and outputs the phase signal received form the polar coordinate converter;
- a power amplifier in communication with the up-converter that amplifies and outputs the phase signal output from the up-converter;
- and
- a bias modulation unit in communication with the polar coordinate converter and the power amplifier, the bias modulation unit comprising:
- a first comparator in communication with the polar coordinate converter to compare an analog form of the envelope curve signal received from the polar coordinate converter with a predetermined voltage;
- and
- a second comparator in communication with the first comparator and the power amplifier, the bias modulation unit configured to amplify and output the envelope curve signal according to different driving voltages based on a comparison result;
- wherein the power amplifier amplifies the phase signal output using the envelope curve signal output from the bias modulation unit as a bias voltage,
- wherein if the analog form of the envelope curve signal is larger than the predetermined voltage, the bias modulation unit amplifies the envelope curve signal according to a first driving voltage, and if the analog form of the envelope curve signal is smaller than the predetermined voltage, the bias modulation unit amplifies the envelope curve signal according to a second driving voltage, the first driving voltage larger than the second driving voltage.
7 more elements
A method of amplifying and transmitting a signal to be transmitted by a transmitting apparatus in a mobile communication system, the method comprising:
- separating and outputting, by the transmitting apparatus, an envelope curve signal which is size information and a phase signal which is phase information from a signal to transmit;
- up-converting and outputting, by the transmitting apparatus, the phase signal;
- using a first comparator to compare an analog form of the envelope curve signal with a predetermined voltage;
- using a second comparator to compare the envelope curve signal amplified by an amplifier according to different driving voltages based on the first comparator comparison result and a signal that is output from a buck converter to drive the buck converter in accordance with the second comparator comparison;
- amplifying and outputting, by the transmitting apparatus, the up-converted phase signal according to a bias voltage supplied by the buck converter based on the amplified and output envelope curve signal;
- and
- transmitting the amplified and output signal, wherein the amplifying and outputting of the envelope curve signal comprises:
- amplifying, by the amplifier in the bias modulation unit, if the analog form of the envelope curve signal is larger than the predetermined voltage, the envelope curve signal according to a first driving voltage;
- and amplifying, by the amplifier in the bias modulation unit, if the analog form of the envelope curve signal is smaller than the predetermined voltage, the envelope curve signal according to a second driving voltage, wherein the first driving voltage is larger than the second driving voltage.
6 more elements
A bias modulation apparatus that supplies a bias voltage to a signal transmitting apparatus that amplifies a phase signal, which is phase information of a signal to transmit, the bias modulation apparatus comprising:
- a first comparator that compares an envelope curve signal which is size information of a signal to transmit and a predetermined voltage, and that outputs a signal corresponding to a comparison result;
- an amplification controller in communication with the first comparator and a plurality of driving voltages, each driving voltage having a different value, the amplification controller outputting a given driving voltage from the plurality of driving voltages according to a signal output from the first comparator;
- an amplifier in communication with the amplification controller, the amplifier amplifies and outputs the envelope curve signal according to the given driving voltage output from the amplification controller;
- and
- a buck converter in communication with the amplifier, the buck converter supplies a bias voltage for restoring a signal to transmit to the signal transmitting apparatus by operating based on the amplified envelope curve signal that is output from the amplifier,
- wherein the bias modulation apparatus further comprises a second comparator in communication with the amplifier and the buck converter, the second comparator compares a signal that is output from the amplifier and a signal that is output from the buck converter, and drives the buck converter according to the comparison result.
3 more elements
Dependencies are inferred from the claim text.