基于偏最小二乘法的功放识别与预失真设计

Recognition of Power Amplifier and Design of Predistorter Based on PLS

在功率放大器功率优化设计的研究中,为克服现代通信系统中功率放大器PA对线性调制信号产生的非线性失真问题,提出了基于偏最小二乘法PLS识别功放与设计预失真的方法。通过采用PLS法、QR分解与最小二乘法LS分别识别功放GMP模型,进行精确度对比,确定PLS法的优越性;又基于PLS法以输出饱和为约束条件,功率最大化与线性误差最小为目标函数,设计了GMP预失真模型,通过计算输入信号、无预失真输出信号与带预失真输出信号相邻信道功率比ACPR说明了所设计预失真满足约束条件与优化目标。仿真结果验证了PLS法在功放识别与预失真设计的可行性及有效性。

In order to reduce the nonlinear distortion impact,which is generated in modulating signal by Power Amplifier（ PA） in communication system,one method based on PLS for recognition of PA and design of predistorter was proposed in the paper. Through the recognition of PA whith three methods,PLS,QR resolve and Least Squares（ LS）,the advantage of PLS was confirmed. A predistorter of GMP model based on PLS was developed with a constrain of output saturation and objectives of maximizing the output power and minimizing the linear error,and the Adjacent Channel Power Ratio（ ACPR） of input signal,output signal without predistorter and output signal with predistorter were computed. Results show that the predistorter which was designed based on PLS meet all the requirements.The feasibility and effectiveness of PLS on recognition of PA and design of predistorter were also verified by simulation.