基于数字预畸变的UMTS功率放大器线性化技术

Digital Predistortion-based Power Amplifier Linearization for Universal Mobile Telecommunications System

提出了适用于UMTS系统上行线路的基于查阅表数字预畸变的功放线性化技术 .通过仿真和测量可以看出 ,数字预畸变可以将邻道功率比性能改善 10dB .尽管这一性能的改善并不是UMTS标准所必需的 ,但它能减少功率放大器的工作点回退 ,或者降低对功放线性特性的要求 ,从而增加功放的效率 .

This paper presents the digital predistortion based on the use of amplifier linearization by means of look-up table (LUT) for the UMTS (universal mobile telecommunications system) uplink.It is shown,by simulations and measurement,that digital predistortion can improve the ACPR performance up to 10 dB.While this improvement is not necessary to fulfill the UMTS specification,it can be used to either reduce the required amplifier back-off or to use a more nonlinear power amplifier,thereby increasing the amplifier efficiency.