| 摘要: |
| 非线性功放特性随温度，供电电压等因素的变化而改变，为保证其稳定工作，预失
真系统的自适应性能就显得非常重要。当前的自适应预失真算法每次都对其参数进行更新，
计算量很大。针对这个问题提出了一种放大估计器的查表法自适应预失真算法，将查表法和
放大器估计器法结合在一起，以误码率为指标在系统允许的误差范围内可以大大减少参数的
迭代次数。同时针对不同的输入回退，可以选择采用不同的预失真算法，从而使其更加接近
功放特性，进一步减少迭代次数。 |
| 关键词: 深空通信 功率放大器 自适应预失真算法 |
| DOI： |
|
| 基金项目:东南大学移动通信国家重点实验室开放研究基金项目（2010D05
）；
国家自然科学基金（61071100，61032003）及新世纪优秀人才计划(NCET-09-0266)联合资助
项目 |
|
| A New Adaptive Predistorter Based on Estimator and LUT |
| ZHANG Song,WEN Hong,ZHANG Gao-yuan,REN Wei-xiang |
| (National Key Lab of Communication,University of Electronic Science and Techno
logy of China,Chengdu 611731,China;National Mobile Communications Research Laboratory, Southeast University, Nanj
ing 210096,China) |
| Abstract: |
| The characteristics of nonlinear amplifier change with temperature and
supply voltage.In order to ensure stability of amplifier, the adaptive predist
ortion becomes very important.To solve the problem of large compulation of exist
ing adaptive predistortion algorithms,a new digital adaptive pre
distorter is designed in this paper. Combining estimator and lookup table meth
od(LUT
),and also by setting bit error rate(BER) as an indicator, the iteration times c
an be significantly r
educed when BER is lower than the standard one. At the same time, for different
i
nput backoff (IBO), different predistortion algorithms can be chosen, so the s
ystem can get better result and iteration times can be further reduced. |
| Key words: deep space communication power amplifier adaptive pred
istortion algorithm |
《电讯技术》编辑部 