改进的统计特性IQ不平衡矫正算法  

Improved IQ imbalance correction algorithm based on statistical characteristics

作　　者：姚亚峰[1] 陈怡铭 周群群[1] 付东兵 YAO Yafeng;CHEN Yiming;ZHOU Qunqun;FU Dongbing(School of Mechanical and Electronic Information,China University of Geosciences,Wuhan 430074,China;Analog IC Key Laboratory,China Electronics Technology Group Corporation,Chongqing 400060,China)

机构地区：[1]中国地质大学(武汉)机械与电子信息学院,湖北武汉430074 [2]中国电子科技集团模拟集成电路国家重点实验室,重庆400060

出　　处：《华中科技大学学报（自然科学版）》2021年第11期12-16,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：模拟集成电路重点实验室稳定支持项目(JCKY2019210C058)。

摘　　要：针对现有矫正算法电路面积大、复杂度高、成本高和响应速度慢等不足,围绕基于统计特性的正交(IQ)不平衡矫正算法,通过剔除传统算法中的复杂平方根和三角运算对参数估计过程进行优化,从而避免了正余弦计算,同时对补偿方式进行相应改进以适应优化之后的参数估计结果.实验结果表明:与传统矫正算法相比,该改进算法在硬件设计中减少了40%的逻辑器件,有效降低了运算的复杂度,避免了牛顿迭代法的高时延问题,矫正之后的镜像抑制比(IRR)比绘圆法提高了8 dB.在相位误差恶劣的应用环境中,该改进算法采用二分法进行相位误差预处理,能够实现稳定的矫正效果.Aiming at the shortcomings in the existing correction algorithms,such as large circuit area,high complexity,high cost and slow response speed,surrounding the in-phase quadrature(IQ) imbalance correction algorithm based on statistical characteristic,its parameter estimation process was optimized by eliminating the complex square root and trigonometric operations in the traditional algorithm,resulting in the avoiding of sine and cosine calculation,and meanwhile the compensation method was improved to adapt to the optimized parameter estimation results.Experimental results show that compared with the traditional correction algorithm,the optimized algorithm reduces 40% logic devices in hardware design,effectively reduces the calculation complexity,avoids the high time delay problem of the Newton iteration method,and improves the image rejection ratio(IRR) by 8 dB compared with the plotted circle method.In the application environment with severe phase error,the optimized algorithm adopts the dichotomous method for phase error pre-processing,which can achieve stable correction effect.

关 键 词：IQ不平衡矫正 正交调制 镜像干扰 零中频接收机 数字信号处理 

分 类 号：TN911.7[电子电信—通信与信息系统]