A novel distortion elimination method of power amplifier in wideband OFDM system  

作　　者：REN ZhiYuan ZHANG HaiLin 

机构地区：[1]State key laboratory of integrated services network, Xidian University, Xi＇an 710071, China

出　　处：《Science China(Information Sciences)》2012年第2期396-406,共11页中国科学（信息科学）（英文版）

基　　金：supported by the 111 Project(Grant No.B08038);State Key Laboratory of Integrated Services Networks(Grant No.ISN090201);Program for New Century Excellent Talents in University(Grant No.NCET08-0810);UK-China Science Bridges:R&D on4G Wireless Mobile Communications,National Natural Science Foundation of China(Grant No.61072069);Fundamental Research Funds for the Central Universities(Grant No.72101855);Fundamental Research Funds for the Central Universities(Grant No.72105377)

摘　　要：The nonlinear, memory and saturate distortion caused by power amplifier lead to low BER performance and low power efficiency in wideband OFDM system. To solve the related problems, a novel power amplifier based on combined amplification with multi power amplifiers is proposed in this paper. In addition, a novel simplified filter look-up table predistorter is proposed. The novel predistorter connects to a memoryless predistorter subsystem with an adaptive filter subsystem in cascade, and can eliminate the nonlinear memory distortion effectively. The simulation results indicate that the power efficiency and BER performance will be improved by using the novel amplifier structure together with the novel predistorter.The nonlinear, memory and saturate distortion caused by power amplifier lead to low BER performance and low power efficiency in wideband OFDM system. To solve the related problems, a novel power amplifier based on combined amplification with multi power amplifiers is proposed in this paper. In addition, a novel simplified filter look-up table predistorter is proposed. The novel predistorter connects to a memoryless predistorter subsystem with an adaptive filter subsystem in cascade, and can eliminate the nonlinear memory distortion effectively. The simulation results indicate that the power efficiency and BER performance will be improved by using the novel amplifier structure together with the novel predistorter.

关 键 词：wideband OFDM dynamic range extended memory predistorter 

分 类 号：TN92[电子电信—通信与信息系统] TN929.5[电子电信—信息与通信工程]