论文部分内容阅读
讨论了几种宽带数字基于傅里叶变换和离散滤波器的Ｈｉｌｂｅｒｔ变换以及对基带内任意带通信号特殊的正交变换技术，并利用Ｇｒａｍ－Ｓｃｈｉｎｉｄｔ正交化校准原理分析了这几种数字正交技术的性能以及Ｉ、Ｑ通过间的幅度和相位不平衡误差。计算机模拟结果表明，除了Ｈｉｌｂｅｒｔ滤波器的不平衡度较大外，其余两种数字正文技术在较宽的频率范围内都能保持很高的镜像抑制，这为实现宽带实时的数字Ｉ、Ｑ通道提供了工程保证。
Several Hilbert transforms based on Fourier transform and discrete filters and some special orthogonal transform techniques of bandpass signals in the baseband are discussed. Some of them are analyzed using the Gram-Schinidt orthogonalization calibration principle Technical performance and I, Q through the amplitude and phase imbalance between the error. Computer simulation results show that, in addition to the large degree of imbalance Hilbert filter, the other two digital text technology in a wide frequency range can maintain a high image rejection, which in order to achieve broadband real-time digital I, Q channel Provided engineering assurance.