基于数字预失真的发射机I/Q不平衡矫正

陈雷; 岳光荣; 唐俊林; 李少谦; 宋志群; 曾媛

doi:10.11999/JEIT160581

基于数字预失真的发射机I/Q不平衡矫正

doi: 10.11999/JEIT160581

2.
(电子科技大学通信抗干扰国家级重点实验室成都 611731) ②(中国电子科技公司第54研究所通信网信息传输与分发技术重点实验室石家庄 050081) ③(上海宇航系统工程研究所上海 201108)

基金项目:

国家科技重大专项课题(2013ZX03005010)，通信网信息传输与分发技术重点实验室开放课题(KX152600016/ITD- U15007)，国家自然科学基金(61371103, 61401447)

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出版历程
- 收稿日期: 2016-06-03
- 修回日期: 2016-12-13
- 刊出日期: 2017-04-19

Calibration of Transmitter I/Q Imbalance Based on Digital Pre-distortion

2.
(National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu 611731, China)

Funds:

The National Science and Technology Major Project (2013ZX03005010), ITDCN Open Program (KX152600016 /ITD-U15007), The National Natural Science Foundation of China (61371103, 61401447)

摘要

摘要: 同相支路(I路)与正交支路(Q路)不平衡、载波泄漏以及带内失真会造成系统性能损失，尤其是在采用直接变频结构的发射机中。该文提出一种自适应I/Q不平衡矫正方案，针对发射机中存在的与频率相关的I/Q不平衡、载波泄漏以及带内失真进行矫正。该文方案直接估计I/Q两支路的反滤波器，避免了先求响应再求逆响应的额外运算，降低了运算复杂度。同时，该文还提出一种基于迭代的在线追踪方案，用于跟踪由于发射机温度变化造成的I/Q不平衡的参数漂移现象。经过复杂度分析，该文提出的方案拥有很高的补偿效率。最后，仿真结果验证了两种方案针对各类射频损伤矫正的有效性。
- 无线通信 /
- 发射机矫正 /
- 射频损伤
Abstract: The in-phase (I) and quadrature (Q) imbalance, carrier leakage and in-band distortion may lead to severe performance degradation, especially in direct-conversion radio architecture. An adaptive pre-distortion scheme is proposed to calibrate I/Q imbalance, carrier leakage and in-band distortion. In the proposed scheme, the inverse filter of each branch is estimated directly which avoids redundant computation. Moreover, an iterative scheme is proposed to track the parameters variation due to temperature in an online manner. By complexity analysis, the proposed scheme is efficient. The effectiveness of the scheme is testified by simulation.
- Wireless communications /
- Transmitter calibration /
- RF impairments

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参考文献(12)

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