【摘 要】
：
5G通信的高速发展对发射机支持多模式多频带并发有了新的需求.考虑非均匀采样率并发双频场景下发射机的线性化方案,针对低采样率频段失真频谱超过采样带宽,从而恶化建模精度
【机 构】
：
中兴通讯股份有限公司,深圳518055;清华大学电子工程系,北京100084
论文部分内容阅读
5G通信的高速发展对发射机支持多模式多频带并发有了新的需求.考虑非均匀采样率并发双频场景下发射机的线性化方案,针对低采样率频段失真频谱超过采样带宽,从而恶化建模精度这一问题,提出一种混叠消除的并发双频数字预失真(DPD)方案.该方案通过在高采样率下构造模型基函数,然后通过低通滤波器来滤除超出采样带宽的频谱分量,再降采样到实际的低采样率上,这样便消除了混叠频谱,能够保证足够的建模精度.为了验证提出的DPD方案,基于中心频点3.5 GHz的宽带Doherty功放搭建了实验测试平台,分别在3.42 GHz和3.57 GHz两个频带发送10 MHz和40 MHz的LTE信号,采用DPD方案后,两个频带邻近信道功率比(ACPR)指标分别改善11.3dB和9.5 dB.
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