公开(公告)号：US06600792B2

公开(公告)日：2003-07-29

申请号：US09105532

申请日：1998-06-26

申请人： Franklin P. Antonio ,  Walid Hamdy ,  Nitin Kasturi ,  Christopher C. Riddle ,  David P. Oses

发明人： Franklin P. Antonio ,  Walid Hamdy ,  Nitin Kasturi ,  Christopher C. Riddle ,  David P. Oses

IPC分类号： H04L2549

CPC分类号： H03F1/3247 ,  H03F1/3241 ,  H03F2201/3233

摘要： A predistortion technique for high power amplifiers includes an adaptive predistortion algorithm that operates independently of data samples to write a set of complex gain values, or predistortion parameters, to a lookup table. The algorithm may be processor-driven. The gain values are taken from the lookup table and multiplied by a complex digital baseband waveform. The gain values may first be subjected to interpolation. The downconverted output of the amplifier is measured to gauge the efficacy of the predistortion. Based on the effect of the predistortion upon the ratio of in-band power to out-of-band power, decisions are made on the set of predistortion parameters for the next iteration of the algorithm. The algorithm runs continuously, perturbing parameters and adapting the predistortion functions accordingly in an effort to continually reflect instantaneous amplitude-modulation and phase-modulation relationships that may change over time with temperature variation or component aging.

摘要翻译： 用于高功率放大器的预失真技术包括自适应预失真算法，其独立于数据样本操作以将一组复增益值或预失真参数写入查找表。 算法可能是处理器驱动的。 增益值取自查表，并乘以复数数字基带波形。 增益值可以首先进行插值。 测量放大器的下变频输出以测量预失真的功效。 基于预失真对带内功率与带外功率之比的影响，决定了该算法下一次迭代的预失真参数集。 该算法连续运行，扰动参数并相应地调整预失真函数，以努力连续反映随着温度变化或分量老化而随时间变化的瞬时幅度调制和相位调制关系。