Power linearizer of a CDMA system and method thereof
AssigneeLG Electronics Inc.
InventorMin-Ho Jin
Life of this patent
Estimating the term…
Abstract
A power linearizer of a CDMA system preferably includes a linearization input unit for compensating a level of an input signal to remove a non-linearity of a power amplifier; an amplification controller for controlling an amplification of the power amplifier; and the power amplifier operated under the control of the amplification controller, for amplifying the power of the level-compensated input signal. By adjusting the voltage inputted to the input terminal of the voltage controlled power amplifier (VCA), the non-linearity of the VCA can be accurately compensated and the power compensation can be easily performed. In addition, the capacity of the CDMA system can be increased.
Claims28
A power linearizer, comprising:
- a linearization input circuit coupled to receive a digital input signal and generate a compensated analog input signal to compensate for non-linear characteristics of a power amplifier, the compensated analog input signal being generated with a gain adjust signal that compensates the non-linear characteristics of the power amplifier;
- an amplification controller configured to control an amplification of the power amplifier;
- and
- a wherein the power amplifier is coupled to amplify the compensated analog input signal in accordance with a control signal.
A power linearizer, comprising:
- an adder configured to add a gain adjust signal and a transmission gain signal to generate a digital gain signal, the gain adjust signal configured to compensate for a non-linear characteristic of a voltage controlled power amplifier;
- a multiplier coupled to multiply the digital gain signal and a digital input signal to generate a compensated digital input signal;
- and
- a digital/analog converter coupled to convert the compensated digital input signal into a compensated analog input signal.
A power linearizing method, comprising:
- computing an power error value between a linear power (P2) and a nonlinear power (P1) for an input voltage;
- square root processing the power error value and computing an adjust gain value;
- adjusting a transmission gain signal using the adjust gain value;
- compensating a level of a digital input signal using the adjusted transmission gain signal;
- and
- amplifying a power of the level-compensated input signal to generate a linearized power signal.
A power linearizer, comprising:
- means for computing a power error value between a linear power (P2) and a nonlinear power (P1) for an input voltage;
- means for SQUARE ROOT processing the computed power error value and computing an adjust gain value;
- means for adjusting a transmission gain signal by using the computed adjust gain value;
- means for compensating a level of a digital input signal by using the adjusted transmission gain signal;
- and
- means for amplifying a power of the level-compensated input signal and outputting a linearized power signal.
A method of compensating a non-linear characteristic of a power amplifier, comprising:
- adding a digital compensation signal to a digital gain adjust signal to generate an adjusted digital compensation signal;
- applying the adjusted digital compensation signal to a digital input signal to generate an adjusted digital input signal;
- and
- converting the adjusted digital input signal to an adjusted analog input signal.
Dependencies are inferred from the claim text.