Title :
A Novel FFT Processor for OFDM UWB Systems
Author :
Wang, Zhongjun ; Yeo, Lee Guek ; Li, Wenzhen ; Yan, Yanxin ; Ting, Yujing ; Tomisawa, Masayuki
Author_Institution :
Oki Techno Centre Pte. Ltd., Singapore
Abstract :
This paper presents a novel mixed-radix fast Fourier transform (FFT) architecture for orthogonal frequency division multiplexing (OFDM) ultra wide-band (UWB) systems. The proposed architecture is simply comprised of two stages. The first stage involves two sliding radix-4 butterflies. The second stage consists of four parallel processing units. These processing units are formed with an identical pipelined radix-2 structure. This unique arrangement has proved to be silicon implementation friendly. Important to note that, with adoption of the proposed architecture, about 25% power saving can be achieved by simply turning off two processing units in the second stage, when the input data are complex conjugate symmetrical
Keywords :
OFDM modulation; coprocessors; fast Fourier transforms; hypercube networks; pipeline processing; ultra wideband communication; FFT processor; OFDM UWB systems; complex conjugate symmetrical input data; mixed-radix fast Fourier transform architecture; orthogonal frequency division multiplexing; parallel processing; radix-2 structure; radix-4 butterfly; silicon implementation; ultra wide-band systems; Clocks; Delay; Energy consumption; Fast Fourier transforms; OFDM; Parallel processing; Pipeline processing; Silicon; Time domain analysis; Transmitters;
Conference_Titel :
Circuits and Systems, 2006. APCCAS 2006. IEEE Asia Pacific Conference on
Conference_Location :
Singapore
Print_ISBN :
1-4244-0387-1
DOI :
10.1109/APCCAS.2006.342448
