一种用于QAM解调的内插滤波器的设计  

Design of an Interpolator Used in QAM Demodulation

作　　者：乔俊杰[1] 吴建辉[1] 张嗣忠[1] 

机构地区：[1]东南大学国家专用集成电路工程技术研究中心,南京210096

出　　处：《固体电子学研究与进展》2005年第4期540-544,共5页Research & Progress of SSE

摘　　要：用频率响应最小均方误差的方法设计了一种用于数字电视QAM解调的插值滤波器,并提出了通过I/Q复用和部分模块的共用来实现插值滤波器的简化结构,节省了硬件资源。用Matlab对滤波器的性能进行了仿真,结果表明其对镜像信号的抑制达到-39dB,与其他类型的插值滤波器相比较,其对镜像信号的抑制性能更好。Adopting a minimum mean-square error criterion, an optimized interpolator used in QAM demodulation is designed, A simplified implementation structure is also proposed, which is achieved by I/O interleaving and reusing of some modules, Its performance is investigated through simulation using Matlab and the result indicates that the attenuation of image frequency is -39 dB. Compared with other kinds of interpolators, its performance is better.

关 键 词：QAM解调 时钟恢复 内插滤波器 

分 类 号：TN713.7[电子电信—电路与系统]