A mixed radix based parallel pipeline FFT processor for MB-OFDM based UWB systems

In this paper, a 128-point FFT processor with high-speed and low computational complexity is proposed for multi-band orthogonal frequency-division multiplexing (MB-OFDM) based ultra-wideband (UWB) systems. A mixed-radix based FFT algorithm with low computational complexity is proposed to implement the 128-point FFT. To get high throughput, an 8-path parallel FFT processor is proposed. Based on the proposed FFT algorithm, the parallel FFT structure is implemented with a hybrid structure, which has high memory efficiency and low computational complexity. The evaluation results show that the proposed 128-point FFT processor can support high data rate transmission with low computational complexity and high memory efficiency.