一种时域I、Q不平衡的校正方法

An Approach to the Correction of I and Q Imbalance in Time Domain

给出了一种时域I、Q不平衡的校正方法。该方法利用标准正弦测试信号 ,在时域内求解I、Q不平衡校正系数。校正系数的求解利用理想I、Q信号的两个性质 ,即在一个测试信号周期内 ,I、Q信号在L2 空间上 ,范数相等 ,内积为零。与文献 [1,2 ]方法相比 ,在求解校正系数时 ,无需对原始数据作离散傅立叶变换 ,大大减小了计算量。计算机模拟结果证明是有效的。最后 ,推导了I、Q校正残差与输入测试信号的信噪比关系。

An approach to the correction of I and Q imbalance in time domain is discussed in this paper. The method uses a standard sinusoidal signal to obtain correction coefficients which exploits two properties of ideal I Q signal, that is I and Q have the same norm and their inner product is zero in in L2 space in one period of the test signal. Compared with documents[1][2], correction coefficients are resolved in time domain rather than in frequency domain, which decreases a great number of calculations. Simulation results show that our method is effective.