| 摘要: |
| 数字预失真系统中，高精度预失真通常需求高阶多项式，而高阶多项式会导致预失真计算量的急剧上升。针对记忆多项式级数与预失真精度的矛盾，提出了一种基于参数选择的数字预失真结构，使用低阶多项式实现了对复杂度高的功率放大器高精度预失真处理，同时避免了计算量的上升。基于一组功率放大器的实测数据进行仿真，验证了参数选择方法相比于传统方法在同计算量的条件下精度的提升；并以正交频分复用信号作为输入信号进行仿真，得到了21 dB的邻近信道功率比抑制效果，相比于传统方法有6 dB的提升。 |
| 关键词: 功率放大器 数字预失真 参数选择 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目(61601233,61750110535) |
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| A digital predistortion structure based on multi-parameter selection |
| MIAO Xiang,WAN Fayu,WANG Lei,LI Binhong |
| (1.School of Electronic & Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China;2.Institute of Microelectronics of the Chinese Academy of Sciences,Beijing 100029,China) |
| Abstract: |
| For digital predistortion of a power amplifier(PA),its precision is determined by the order of included memory polynomial directly,and higher-order polynomial is required in the digital predistortion for complex PA,which will lead to enormous calculation.To solve this problem,this paper proposes a new digital predistortion method with parameter-selecting and applies the low-order polynomial to complex digital predistortion to avoid increasing calculation.The proposed method is simulated with the collected data from a real PA,and it is confirmed that the proposed method provides higher precision than common ways with the same polynomial order.By setting orthogonal frequency division multiplexing(OFDM) signal as input and simulating the predistortion structure,the adjacent channel power ratio(ACPR) of PA′s output decreases by 21 dB,which is 6 dB better than that of the common ways. |
| Key words: power amplifier digital predistortion parameter selection |
《电讯技术》编辑部 