一种采用分权自适应算法的超高频数字预失真功率放大器

2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535) Pub Date : 2004-06-06 DOI:10.1109/MWSYM.2004.1339009

K. Horiguchi, M. Miki, J. Nagano, H. Senda, K. Yamauchi, M. Nakayama, T. Takagi

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引用次数: 5

摘要

提出了一种基于权分自适应算法的查找表(LUT)型自适应数字预失真(ADPD)算法。该算法以功率放大器(PA)的输出信号作为参考信号。此外，参考信号被LUT的系数所分割，使得PA的温度依赖性等特性不会对收敛性能产生影响。给出了该算法，并给出了收敛条件。通过ADPD仿真，我们证明了该算法比传统的归一化最小均方(NLMS)算法更稳定。所研制的uhf频段ADPD功率放大器在地面电视广播综合业务数字广播(ISDB-T) OFDM信号下，在54.8dBm输出功率下实现了-50dBc的互调失真和18%的PA效率。

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A UHF-band digital pre-distortion power amplifier using weight divided adaptive algorithm

A look up table (LUT) type adaptive digital pre-distortion (ADPD) using a weight divided adaptive algorithm is presented. In this algorithm, an output signal of the power amplifier (PA) is used as a reference signal. Additionally, reference signal is divided by the coefficient of the LUT, so that the characteristics of the PA, such as temperature dependence, do not have influence on the convergence performances. The proposed algorithm is presented and the convergence condition is derived analytically. From the ADPD simulation, we present that the proposed algorithm is more stable than the conventional normalized least mean square (NLMS) algorithm. The developed UHF-band ADPD power amplifier achieved the intermodulation (IM) distortion of -50dBc and the PA efficiency of 18% at output power of 54.8dBm under an integrated services digital broadcasting for terrestrial television broadcasting (ISDB-T) OFDM signal.

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来源期刊

2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)

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