Look-up-table Predistortion Techniques for Nonlinear Power Amplifier
| Autor: | Tai, Kuang-Ting, 戴光廷 |
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| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 Digital predistortion (DPD) is known to be an effective method for the compensation of nonlinear distortion in power amplifiers. Two methods are well known in DPD, i.e, memory-polynomial and look-up-table (LUT). Due to its various advantages, the LUT method is preferable for real-world applications. Conventional LUT methods only consider one-dimensional (1D) LUT for memoryless PAs. This thesis proposes using multi-dimensional (MD) LUTs for PAs with memory. Since the size of the LUT will fast grow with the input dimension, two methods are proposed to reduce the size of the LUT, i.e, resolution-reduction and three-point Lagrange interpolation. To further enhance the performance, a new training method is also proposed. With the method, the interpolating weights can be well trained such that better interpolation performance can be obtained. Simulation results show that the proposed methods can effectively reduce the size of the MD LUT while maintaining the performance. Also, the proposed training method outperforms the conventional methods. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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