LINC transmitter for linear amplification systems.

摘要

This project is dedicated to develop and implement a practical linear amplification with nonlinear components (LINC) transmitter for modern wireless communication systems. Several aspects of design for the digital signal component separator (DSCS) and high performance high efficiency power combiner are presented in this thesis.; A crucial function of LINC is the signal component separator (SCS). A modern version, using a standard DSP device, was first evaluated. It has two major disadvantages: low bandwidth and high power consumption. Next, a new digital signal separation (NDSCS) architecture, based on an FPGA (Field-Programmable Gate Array), is presented and used to enhance the flexibility and the speed of the signal processing.; Next, a new combiner is proposed. Two of the basic power combiners' (isolated and non-isolated) voltage/current models are analyzed and a variable reactive termination combiner (VRTC) is proposed, developed and implemented. The proposed model's load impedance, presented to the power amplifiers, is varied according to the amplitude of the input signal in a way that optimizes the LINC transmitter's efficiency. (Abstract shortened by UMI.)