Study on Implementation of DDC Based on Walsh Transform
Shen Wei · Modern Radar · 2006
Digital down converter is a key component in digital receivers.Sampling rate of converter deserves to pay attention.An efficient decimation architecture based Walsh transform for HF surface wave radar receivers is presented.The proposed DDC takes into consideration the complexities of algorithm due to the relatively high data rate and the intensive filtering operations involved in commonly used decimators,which substitute multiplication-addition for addition-subtraction imposed on filter.Performances are compared with that of other similar decimators.Experiment results show that the new decimators outperform others,so they are suited for real time signal processing in DSP,such as ADSP21060.