Coefficient Ordering Based Pipelined FFT/IFFT with Minimum Switching Activity for Low Power WiMAX Communication System

Author

Wu, Jen-Ming ; Fan, Yang-Chun

Author_Institution

Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu

fYear

0

fDate

0-0 0

Firstpage

1

Lastpage

4

Abstract

In this paper, we present a modified coefficient ordering based pipelined 256-point FFT/IFFT processor with minimum switching activity for IEEE 802.16-2004 (or WiMAX) system. The fixed radix-4 and single-path pipelined architecture is used in this FFT design. The pipelined architecture provides higher throughput rate comparing with the iterative architecture. We have shown that the low power issue is addressed by minimizing the switching activity using minimum Hamming distance transition. The switching activity of twiddle computation is thus reduced from 181 to 71, i.e. 61% reduction. We have implemented the VLSI design of the OFDM transmitter with 16-bit word length. The signal to quantization noise ratio is improved to 120 dB

Keywords

OFDM modulation; VLSI; WiMax; fast Fourier transforms; pipeline processing; radio transmitters; IEEE 802.16 system; OFDM transmitter; VLSI design; WiMAX communication system; inverse fast Fourier transform; minimum Hamming distance transition; minimum switching activity; orthogonal frequency division multiplexing; pipelined 256-point FFT-IFFT processor; radix-4 architecture; switching activity; twiddle computation; very large scale integration; Communication switching; Computer architecture; Hamming distance; IEEE activities; OFDM; Quantization; Throughput; Transmitters; Very large scale integration; WiMAX; FFT; OFDM; Switching Activity;

fLanguage

English

Publisher

ieee

Conference_Titel

Consumer Electronics, 2006. ISCE '06. 2006 IEEE Tenth International Symposium on

Conference_Location

St. Petersburg

Print_ISBN

1-4244-0216-6

Type

conf

DOI

10.1109/ISCE.2006.1689472

Filename

1689472