一种用于IMT-2000基站的高效自适应数字预失真放大器

The 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring. Pub Date : 2003-04-22 DOI:10.1109/VETECS.2003.1208780

T. Kubo, N. Fudaba, H. Ishikawa, H. Hamada, K. Nagatani, H. Hayashi, T. Maniwa, Y. Oishi

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引用次数: 11

摘要

我们为使用自适应数字预失真器(DPD)的IMT-2000基站系统开发了世界上最紧凑、最节能的发射机放大器。通过减少功率放大器的输出回退(从饱和点的余量)和通过抑制DPD导致的非线性失真的增加，功率效率得到了提高。该方法采用预失真技术，通过最小均方(LMS)算法估计放大器的失真特性，并在具有失真反向特性的数字基带信号中添加互补信号。我们开发的功率放大器的功率效率是传统功率放大器的两倍。本文介绍了DPD系统的组成和DPD发射机样机的实验结果。目前，配备DPD的IMT-2000基站系统正在向世界各地出售。

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A highly efficient adaptive digital predistortion amplifier for IMT-2000 base stations

We have developed the world's most compact, energy-efficient transmitter amplifier for IMT-2000 base station systems that uses an adaptive digital predistorter (DPD). The power efficiency is improved by reducing the output back-off (the margin from the saturation point) of power amplifiers and by suppressing the resulting increase in nonlinear distortion with the DPD. This method uses a predistortion technique that estimates the distortion characteristics of amplifiers by using the least mean square (LMS) algorithm, and it adds a complementary signal to the digital baseband signal with a reverse-characteristic of the distortion. The power amplifiers we have developed achieve twice the power efficiency of conventional types. In this paper, we describe the DPD equipment and the experimental results of a DPD transmitter prototype. Currently, IMT-2000 base station systems equipped with the DPD are being shipped worldwide.

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The 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring.

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