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为了消除功放非线性带来的失真,满足制定的功率谱密度要求,自适应数字基带预失真技术以其良好的线性度、宽带宽、高效率和全自适应性等优点而成为消除功放失真的首选。从几种线性化技术的比较开始,介绍了两种数字预失真结构,给出了数字基带预失真的工作原理,构建了数字基带预失真电路并在ADS环境下实现了系统级仿真。仿真结果表明构建的数字基带预失真系统能够获得好的预失真效果,功率谱密度的最大改善能够达到30dBm。创建的系统级仿真电路对实际的数字预失真系统设计起着重要的指导作用。
In order to eliminate the distortion caused by the non-linearity of the power amplifier and meet the requirements of the power spectral density, the adaptive digital baseband predistortion technology can eliminate the distortion of the power amplifier due to its advantages of good linearity, wide bandwidth, high efficiency and full self-adaptability Preferred. Starting with the comparison of several linearization techniques, two types of digital predistortion structures are introduced, the working principle of digital baseband predistortion is given, a digital baseband predistortion circuit is constructed, and a system-level simulation is implemented in the ADS environment. The simulation results show that the constructed digital baseband predistortion system can obtain a good predistortion effect, and the maximum improvement of the power spectral density can reach 30 dBm. The created system-level simulation circuit plays an important guiding role in the actual digital predistortion system design.