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计算机工程 ›› 2012, Vol. 38 ›› Issue (7): 230-232. doi: 10.3969/j.issn.1000-3428.2012.07.076

• 工程应用技术与实现 • 上一篇    下一篇

一种适合于硬件实现的数字预失真算法

董传盛,曾 真,谈 熙,闵 昊   

  1. (复旦大学专用集成电路与系统国家重点实验室,上海 201203)
  • 收稿日期:2011-07-25 出版日期:2012-04-05 发布日期:2012-04-05
  • 作者简介:董传盛(1986-),男,硕士研究生,主研方向:数字预失真技术,数字校正算法;曾 真,硕士研究生;谈 熙,助理研究员、博士;闵 昊,教授、博士、博士生导师
  • 基金资助:
    国家“863”计划基金资助项目(2009AA011605);“核高基”重大专项(2009ZX01031-003-002);国家自然科学基金资助项目(61076028)

Digital Predistortion Algorithm Suitable for Hardware Implementation

DONG Chuan-sheng, ZENG Zhen, TAN Xi, MIN Hao   

  1. (State Key Laboratory of ASIC & System, Fudan University, Shanghai 201203, China)
  • Received:2011-07-25 Online:2012-04-05 Published:2012-04-05

摘要: 传统的数字基带预失真算法较复杂不易实现。为此,设计一种适合于硬件实现的数字预失真算法。考虑对模拟射频部分引入的环路延迟和相位偏转的补偿,采用2块大小为32×16的查找表作为预失真模块,存储针对不同输入幅度信号的调整系数,以预先抵消功率放大器的失真。用调制方式为64QAM OFDM信号进行测试,结果表明,该算法的预失真性能较好。

关键词: 功率放大器, 预失真, 查找表, 硬件实现, 环路延迟, 相位粗旋转

Abstract: Since most algorithms for predistortion are too complex to implement, this paper designs an efficient algorithm of digital predistortion suitable for implementation with two 32×16 Look Up Table(LUT) as the predistortion block, considering the loop delay of the analog/RF circuits and the phase rotation. Coefficients used to predistort input signal are stored in LUT in order to compensate for distortion of Power Amplifiers(PA). With 64-QAM OFDM signal, result shows that this method can improve Adjacent Channel Power Ratio(ACPR).

Key words: Power Amplifier(PA), predistortion, Look Up Table(LUT), hardware implementation, loop delay, phase coarse rotation

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