High-efficiency linear LINC transmitter

Abstract

The invention provides a high-efficiency linear LINC transmitter which comprises a signal preprocessing unit, a signal separation unit, an analogue upconversion unit, an amplifying processing unit and a vector resultant unit, wherein the signal preprocessing unit finishes the segmenting pre-distortion processing for inputted signals and the control of a synthesizer; the signal separation unit divides the signals after pre-distortion into two ways of constant envelope phase-modulated signals; the analogue upconversion unit converts the two ways of separated digital baseband signals into analogue signals, and carries out quadrature modulation to radio frequency; the amplifying processing unit amplifies the power of the two ways of radio frequency signals; and the vector resultant unit synthesizes and outputs the power of the two ways of signals. The signal preprocessing unit can calculate an equilibrium angle theta during signal separation according to the amplitude of the inputted signals and divide the interval of the equilibrium angle theta before signal separation to generate different control signals so as to ensure that the input resistance of the synthesizer changes along with the equilibrium angle theta. In order to guarantee that the LINC transmitter has high linear index, the invention also carries out segmenting pre-distortion processing on the inputted signals according to the interval of the equilibrium angle theta.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a high-efficiency linear LINC transmitter. Background technique [0002] In modern wireless communication systems, efficiency and linearity are always two key factors for transmitters. Usually, researchers either achieve high-efficiency indicators alone or achieve high-linearity indicators alone, and it is not meaningful to pursue the perfection of one indicator alone. However, it is very difficult to better realize both indicators in the same transmitter. The LINC technology can just solve the efficiency and linearity problems of the power amplifier. It uses a high-efficiency nonlinear power amplifier to amplify the phase-modulated signal with a constant envelope, so that the adverse effects caused by the nonlinearity of the power amplifier can be avoided, so It not only ensures the high linearity of the transmitter, but also ensures the high efficiency of the t...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the embodiments of the present invention is to provide a high-efficiency linear LINC transmitter structure, which can further improve the average combining efficiency of the non-isolated power combiner, and solve the problem of linearity caused by the nonlinear characteristics of the combiner The problem of index deterioration, truly realize the high-efficiency linear amplification of the signal

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