放大器预失真系统中的环路延迟估计  

Loop Delay Estimation in HPA Pre-distortion Systems

作　　者：艾渤[1] 钟章队[1] 朱刚[1] 许荣涛[1] 丁建文[1] 

机构地区：[1]北京交通大学轨道交通控制与安全国家重点实验室,北京100044

出　　处：《系统仿真学报》2007年第19期4487-4489,共3页Journal of System Simulation

基　　金：北京交通大学人才基金资助(2007RC022)

摘　　要：在基于查询表Look-upTable(LUT)、多项式增益的方法中,必须要做数字信号的基带解调,因此就需要估计耦合反馈回路中的环路延迟以保证正确的基带解调。已有相关文献讨论PA预失真系统中的环路延迟估计问题,但都存在着一些不足。针对这些不足,提出了包括整数倍和小数倍新的环路延迟估计方法,仿真结果及相关分析表明:与以往相关算法相比,整数倍估计方法大大降低了算法复杂度;而小数倍延迟估计则消除了对系统制式的要求,应用更加广泛。Base-band demodulation should be carried out in those pre-distortion methods based on the LUT and polynomial gain techniques. Therefore, the loop delay estimation must be taken into consideration to ensure the correct demodulation. Some literatures have dealt with the loop delay estimation with some limits in their estimation process. A novel loop delay estimation method was proposed including integer part and decimal part estimation. Simulation results and the corresponding analysis demonstrate that compared with the previous methods, the computational complexity with the proposed integer part estimation is much lower, while the decimal estimation finds wider applications.

关 键 词：高功率放大器 数字基带预失真 线性化技术 环路延迟估计 

分 类 号：TN919.8[电子电信—通信与信息系统]