A compensation scheme for nonlinear distortion in OFDM systems
A compensation scheme for nonlinear distortion in OFDM systems
复制标题
正交频分复用系统中非线性失真的补偿方案
DOI：
10.1109/glocom.2000.891237
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Jaehak Chung
中科院分区：
文献类型：
--
作者：
Sekchin Chang;E. Powers;Jaehak Chung
提出了一种自适应预失真器来补偿OFDM系统中高功率放大器（HPA）引入的非线性失真。OFDM系统特别容易受到HPA非线性的影响，这是因为它们具有大的峰均功率比。与以前的工作相比，本文中的自适应预失真器是基于直接和间接的学习架构，并利用复杂的沃尔泰拉系列，这是已知的是适合于补偿非线性现象。结果表明，新的预失真器方案具有更快的收敛速度比以前的方法的基础上的间接学习架构。此外，OFDM系统的预失真器的性能进行评估的总退化，最佳输出回退，和BER。
This paper presents an adaptive predistorter to compensate nonlinear distortion introduced by the high power amplifier (HPA) in OFDM systems. OFDM systems are susceptible to HPA nonlinearities in particular because of their large peak-to-average power ratios. In contrast to earlier work, the adaptive predistorter in this paper is based on both the direct and indirect learning architectures, and utilizes a complex Volterra series which is known to be suitable for compensating nonlinear phenomena. It is shown that the new predistorter scheme exhibits faster convergence than the previous method based on the indirect learning architecture only. In addition, the performance of the predistorter for OFDM systems is evaluated in terms of total degradation, optimal output backoff, and BER.