摘要
OFDM技术具有频谱利用率较高和抗多径干扰能力强的优点.但OFDM信号较高的峰值平均功率比对功率放大器的线性度提出了更高的要求。针对有记忆功率放大器,提出了一种基于查找表的自适应预失真方案,该方案利用多项式法补偿放大器的非线性特性,并将其应用于OFDM系统中。仿真结果表明,该方案能够很好地改善预失真效果,并且在算法收敛速度和节约硬件资源方面都有所提高。
OFDM technology is of high frequency spectrum utilization and could resist the multipath fading. However, OFDM＇ s high PAPR requires fairly high linearity of HPA. For the memory power amplifier, an adaptive pre-distortion scheme based on LUT is proposed, which could compensate the amplifier＇ s nonlinearity characteristics with polynomial method and is applied to OFDM system. Simulation results show that this scheme could improve the effect of pre-distortion, and also has a raise in convergence speed of the algorithm and saving of hardware resources.
出处
《通信技术》
2012年第12期41-43,47,共4页
Communications Technology
基金
福建省自然科学基金项目(No.2012J01275)
