標題: Hybrid Architecture Design for Calculating Variable-Length Fourier Transform
作者: Lai, Shin-Chi
Juang, Wen-Ho
Lee, Yueh-Shu
Chen, Shin-Hao
Chen, Ke-Horng
Tsai, Chia-Chun
Lee, Chiung-Hon
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: Digital radio mondiale (DRM);fast Fourier transform (FFT);recursive discrete Fourier transform (RDFT)
公開日期: 三月-2016
摘要: This brief presents a hybrid structure to effectively compute the variable-length Fourier transform by employing the recursive and radix-2(2) fast algorithm. After applying a hardware-sharing scheme to both fast algorithms, the proposed method not only improves the drawback of higher hardware cost in implementation but also retains the regular and flexible nature of recursive discrete Fourier transform (RDFT). The proposed hardware accelerator only costs four real multipliers and ten real adders with a greater reduction (86.7% and 66.7%, respectively) than Kim et al.\'s design. In addition, the number of multiplications and additions for 256-point DFT computations can be reduced by 38.6% and 70%, respectively, compared to Lai et al.\'s recent approach. For accuracy analysis, the SNR value of the proposed design, at least, is 4 dB higher than the other RDFT designs. Considering a whole evaluation, a very-large-scale integration chip design was further fabricated using TSMC 0.18-mu m 1P6M CMOS process. The core size was only 660 x 660 mu m(2), and the measured power consumption was 8.8 mW @ 25 MHz. The result shows that the proposed chip included data memory is 1.38 times the computational efficiency per unit area of Lai et al.\'s work. Therefore, it will be the state-of-the-art RDFT processor in the application of various variable-transform-length digital signal processing issues.
URI: http://dx.doi.org/10.1109/TCSII.2015.2482238
http://hdl.handle.net/11536/133498
ISSN: 1549-7747
DOI: 10.1109/TCSII.2015.2482238
期刊: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
Volume: 63
Issue: 3
起始頁: 279
結束頁: 283
顯示於類別:期刊論文