Complexity of DPD linearization in the full RF-band for a WiMAX power amplifier

N. Wolff, O. Bengtsson, W. Heinrich
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引用次数: 2

Abstract

In this paper, the influence of channel frequency in the RF-band on digital predistortion (DPD) is investigated empirically. A class-AB GaN-HEMT power amplifier targeting the 3.5 GHz band for WiMAX is used with a 20 MHz OFDM signal. It is found that frequency dependent memory effects in the band have a strong impact on the amount of memory taps needed for the DPD predistorter model. The overall characteristic is dominated by the non-linear behavior of the transistor, the memory effects, and the IQ imbalance introduced by the low cost modulation hardware. Using DPD models with memory that can handle IQ imbalance the EVM is improved by at least 12 dB in backed-off operation.
WiMAX功率放大器全rf频段DPD线性化的复杂性
本文对射频波段信道频率对数字预失真(DPD)的影响进行了实证研究。针对WiMAX 3.5 GHz频段的ab类GaN-HEMT功率放大器与20mhz OFDM信号一起使用。研究发现,频带中频率相关的记忆效应对DPD预失真器模型所需的记忆抽头数量有很大影响。晶体管的非线性特性、记忆效应和低成本调制硬件带来的IQ不平衡是其总体特性的主要因素。使用具有可处理IQ不平衡的内存的DPD模型,EVM在后退操作中至少提高了12 dB。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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