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This paper describes the implementation of a large bandwidth multi-GPU signal processing system for radio astronomy observation. This system performs computationally intensive FFT (Fast Fourier Transform) and spectrum analysis to achieve real-time analysis of a large bandwidth spectrum. This is accomplished by implementing a four-step FFT algorithm in CUDA. The key feature of this implementation is that the data size transferred between CPU and GPU is reduced using redundant calculation. Wedoi:10.1109/ispa.2010.53 dblp:conf/ispa/KondoHOWH10 fatcat:okujf4xfazbk5px2m44dobywji