Adaptation of a digital predistortion technique based on intersymbol interpolation
Adaptation of a digital predistortion technique based on intersymbol interpolation
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基于符号间插值的数字预失真技术的改进
DOI：
10.1109/glocom.1995.500340
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
H. Sari
中科院分区：
文献类型：
--
作者：
Y. Lévy;G. Karam;H. Sari
本文研究了数字预失真技术的几种自适应策略的性能，该技术有效地补偿了带宽有效的数字通信系统中功率放大器的非线性。该研究包括笛卡尔坐标系中的梯度算法，极坐标系中的梯度算法，使用平均的预失真器优化，以及在接收机侧的自适应项的计算和使用返回信道将其反馈到发射机。我们的研究结果表明，实现最佳性能时，该算法是在极坐标系和自适应项计算在发射机使用辅助本地解调器。给出了采用32-QAM信号格式的无线电系统的数值结果。
This paper investigates the performance of several adaptation strategies of a digital predistortion technique which efficiently compensates for power amplifier nonlinearities in bandwidth-efficient digital communication systems. The study includes the gradient algorithm in Cartesian coordinates, the gradient algorithm in polar coordinates, the predistorter optimization using averaging, as well as the computation of the adaptation terms at the receiver side and their feeding back to the transmitter using a return channel. Our results indicate that the best performance is achieved when the algorithm is implemented in polar coordinates and the adaptation terms are computed at the transmitter using an auxiliary local demodulator. Numerical results are given for a radio system employing the 32-QAM signal format.