一种基于互相关序列的功放行为模型建立方法
doi: 10.3724/SP.J.1146.2008.00318
A Method of PA Behavioral Modeling Based on Cross-Correlation Sequence
-
摘要: 该文提出了一种基于功率放大器行为模型误差信号与输入信号互相关的行为模型时延估计算法，并在此基础上讨论了如何动态建立放大器行为模型的方法。采用这种方法建立非均匀时延的记忆多项式(Memory Polynomial, MP)行为模型。仿真结果显示该文提出的时延估计算法能够有效地寻找到输出信号中的主要时延分量，从而将传统MP模型的时延长度由6减少到2，同时模型NMSE只降低不到3dB，表明这种行为模型建立方法能够很好地在模型复杂度与模型精度之间寻求平衡。Abstract: In this paper, a time delay estimate algorithm based on analysis of cross-correlation sequence of model error and input signal is proposed, and a method to build behavioral model of power amplifiers dynamically depend on the new delay estimate algorithm is discussed. Using this method, a non-union delay Memory Polynomial(MP) model is built. Simulation results show the new algorithm can find main delays in output signal effectively and reduce the delay length of traditional MP model from 6 to 2 at the cost of 3 dB increase of models NMSE, which means the algorithm can achieve a good balance between model complexity and its precision.
-
Pedro J C and Maas S. A comparative overview of microwaveand wireless power-amplifier behavioral modeling approaches[J].IEEE Trans. on Microw. Theory Tech.2005, 53(3):1150-1163[2]Wood J and Root E. Fundamentals of Nonlinear BehavioralModeling for RF and Microwave Design. Norwood, MA:Artech House, 2005: 1-21.[3]Tsimbinos J and Lever V. Computational complexity ofVolterra based nonlinear compensators[J].Electron Lett.1996,32(9):852-854[4]Zhu A, Pedro J C, and Cunha T R. Pruning the Volterraseries for behavioral modeling of power amplifiers usingphysical knowledeg[J].IEEE Trans. on Microw. Theory Tech.2007, 55(5):813-821[5]Ahmed A, Endalkachew S M, and Kompa G. Power amplifierlinearization using memory polynomial predistortion withnon-uniform delay taps. IEEE MTT-S Int. Microwave Symp.Dig., Port Worth, Texas, USA, 2004: 1871-1874.[6]Wood J, LeFevre M, and Runton D, et al.. Envelope-domaintime series (ET) behavioral model of a doherty RF poweramplifier for system design[J].IEEE Trans. on Microw. TheoryTech.2006, 54(8):3163-3172[7]Gilahert P L, Silveira D D, and Montoro G, et al.. Heuristicalgorithms for power amplifier behavioral modeling[J].IEEEMicrow. on Wireless Compon. Lett.2007, 17(10):715-717[8]Ljung L and System Identification. Theory for the User.Prentice Hall PTR, 1998: 112-113.[9]Liu T, Boumaiza S, and Ghannouchi F. Augmentedhammerstein predistorter for linearization of broad-bandwireless transmitters[J].IEEE Trans. on Microw. Theory Tech.2006, 54(4):1340-1349 -
计量
- 文章访问数: 3235
- HTML全文浏览量: 92
- PDF下载量: 669
- 被引次数: 0
下载:
