作者：蔡顺燕1,2, 庹先国1, 杨剑波1
作者单位：1. 成都理工大学地球探测与信息技术教育部重点实验室, 四川 成都 610059;
2. 成都师范学院, 四川 成都 611130
关键词：等效采样;数字预失真;功率放大器;线性化
摘要：
为降低数字预失真系统对反馈回路ADC采样速率的要求, 提出一种基于等效采样的预失真线性化方法, 首先将周期性训练序列送入功放系统, 然后采用等效采样的方式对反馈回路信号进行采样, 最后使用等效采样数据设计预失真器。实验证明:文中提出的方法正确可行, 能达到与实时采样方法相当的线性化效果。该方法可应用于小体积、低功耗、低成本的数字预失真功放线性化系统。
Digital predistortion method based on equivalent sampling
CAI Shunyan1,2, TUO Xianguo1, YANG Jianbo1
1. Key Lab of Earth Exploration & Information Techniques of Ministry of Education, Chengdu University of Technology, Chengdu 610059, China;
2. Chengdu Normal University, Chengdu 611130, China
Abstract: In order to reduce the requirement on the ADC sampling rate of feedback loops in the power amplifier predistortion linearization system, a predistortion method has thus been proposed based on equivalent sampling. First, sent the periodic training sequence was to the system mentioned above; second, sample the feedback loop signals through the equivalent sampling method; and next, design a predistorter using the equivalent sampling data. The experiments show that the method is correct and feasible, which can achieve the similar linearization performance of the real-time sampling method. Therefore, the digital predistortion method can be applied in the power amplifier linearization systems of small volume, low power consumption and low costs.
Keywords: equivalent sampling;digital predistortion;power amplifier;linearization
2015, 41(6): 96-100 收稿日期: 2014-11-29;收到修改稿日期: 2015-1-18
基金项目: 国家863计划项目(2012AA063501)四川省教育厅项目(14ZB0330)成都师范学院项目(CS137ZA03)
作者简介: 蔡顺燕(1981-),女,博士,四川绵竹市人,研究方向为核信号检测及处理。
参考文献
[1] Padmanabhan S, Peng L, Andreas S. Optimizing the identification of digital predistorters for improved power amplifier linearization performance[J]. IEEE Transactions on Circuits and Systems-II:Express Briefs, 2014, 61(9):671-675.
[2] Hu X, Wang G, Wang Z C, et al. Predistortion linearization of an X-Band TWTA for communications applications[J]. IEEE Transactions on Electron Devices, 2011, 58(6):1768-1774.
[3] Deleu T, Dervin M, Kasai K, et al. Iterative Predis-tortion of the Nonlinear Satellite Channel[J]. IEEE Transactions on Communications, 2014, 62(8):2916-2926.
[4] 詹鹏, 秦开宇, 陈长伟, 等. 欠采样方法在预失真线性化技术中的应用[J]. 计算机工程与应用, 2011, 47(16):62-64.
[5] 车俐, 蒋留兵. 伪随机等效采样法在超宽带接收机中的应用[J]. 现代雷达, 2014, 36(7):62-44.
[6] 余慧敏. 基于FPGA的低功耗等效数据采样装置[J]. 仪表技术与传感器, 2013(6):96-98.
[7] 吴志刚, 黄在朝, 吴鹏. 基于FPGA的等效采样在光时域反射计中的应用[J]. 光通信技术, 2012(10):44-46.
[8] Yang G H, Wang L L. One-step model extraction method for direct learning digital predistortion[J]. Electronics Letters, 2014, 50(16):1148-1150.
[9] Meenakshi R, Karun R, Fadhel M, et al. Generalized rational functions for reduced-complexity behavioral modeling and digital predistortion of broadband wireless transmitters[J]. IEEE Transactions on Instrumentation and Measurement, 2014, 63(2):485-498.
