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Research of Compensating Zero-IF Modulator IQ Imbalance in Digital Domain
Author(s): 
Pages: 163-166
Year: Issue:  23
Journal: Video Engineering

Keyword:  zero-IFdigital domainimage frequency interferenceLO-leakage;
Abstract: 考虑到零中频发射机存在的镜频干扰和本振泄露会产生带内干扰,分析了同相正交信号(IQ)的非理想特性,给出了易于硬件实现的校正方法.当输出射频信号开环时,提出在数字域中建立查找表和校正IQ不平衡的操作方法;当射频信号闭环时,提出自适应补偿的基本方法和环路时延估计,并给出了仿真方法.最后,通过运用开环校正物理实现验证,残留镜像和载漏信号均比有效边带信号低40dB以上,提高了信噪比.
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