基于二阶采样的免混频全数字化正交解调  

Mixer-Free All Digital Quadrature Demodulation Based on Second-Order Sampling

作　　者：王飞雪[1] 郭桂蓉[1] 

机构地区：[1]国防科技大学自动目标识别国家重点实验室,长沙410073

出　　处：《电子学报》1999年第6期118-119,共2页Acta Electronica Sinica

摘　　要：提出一种基于二阶采样（Second-ordersampling）技术的带通信号免混频全数字化正交解调方法．该方法直接对中频带通信号进行二阶采样，然后通过线性移相数字滤波器获得正交的两路基带信号，该方法可省略正交混频环节，与基于一阶采样技术的免混频正交解调方法相比，采样率的选择有更大的灵活性．A mixer-free all digital quadrature demodulation method based on second-order sampling is proposed. This method makes esecond-order sampling of a bandpass signal directly, and produces quadrature basebands by passing the samples through linear-phase-shifting filters. Mixers are omitted in this method. Compared with the methods based on first-order sampling the method we proposed here has more freedom in the selection of sampling rates.

关 键 词：二阶采样 正交解调 相干检波 解调技术 

分 类 号：TN763[电子电信—电路与系统]