Bandpass Sampling Theorem and Digital Quadrature Coherent Detection
Wei Yong-hao, An Hong · Modern Radar · 2006
Fundamentals of IF(Intermediate Frequency) bandpass signal sampling and quadrature detection are discussed,especially the coherent mixing LPF method and Hilbert transform frequency-shift method.In-depth comprehension of bandpass sampling theorem allows expanding the application fields,and applicable condition,principle diagram and signal-flow graphs are given respectively.These results help to understand and utilize quadrature coherent detection.Finally,simulation examples are given to validate the effectiveness of proposed methods.