摘要
针对OFDM系统中功率放大器的非线性,设计了一种功放自适应预失真器,提出了基于内插环路的同步处理、RASCAL算法的自适应查询表预失真技术。增加同步误差判定模块以及查询表刷新判定模块,保证系统在同步误差波动情况下可靠工作,实现了系统的自适应处理。仿真表明该方法可以在同步误差波动情况下将OFDM系统发射机功率谱泄露改善约17 dB。
Aiming at dealing with the non-linearity of power amplifier in OFDM system, an adaptive pre-distortion for power amplifier based on inter- polation synchronization loop, LUT adaptive pre-distortion technique of RASCAL algorithm is designed. The synchronization error determining module and the LUT refreshed determining module to guarantee the dependability and adaptability of the system in case of synchronous error fluctuations are in- troduced. The result of the simulation shows that the leakage of power spectrum of OFDM system transmitter can be improved 17 dB approximately based on this method in case of synchronous error fluctuations.
出处
《电视技术》
北大核心
2014年第9期180-183,共4页
Video Engineering
基金
福州大学科技发展基金项目(2011-XQ-29)
福州大学育苗基金项目(2012-XY-25)
关键词
OFDM
同步误差波动
自适应处理
OFDM
synchronization error fluctuations
adaptive pre-distortion
