Dynamic wordlength calibration for energy reduction FFT processors in wireless LAN

Author

Jaeseong Kim ; Yoshizawa, Shingo ; Miyanaga, Yoshikazu

Author_Institution

Grad. Sch. of Inf. Sci. & Technol., Hokkaido Univ., Sapporo, Japan

fYear

2011

fDate

7-10 Aug. 2011

Firstpage

1

Lastpage

4

Abstract

In this paper, we describe a way of reducing the energy for a fast Fourier Transform (FFT) processor using a dynamic wordlength technique in wireless OFDM systems. The proposed method is used to search an optimum wordlength of FFT processor by utilizing the Hamming distance to compare output binary data after channel decoding with maximum wordlength and other wordlengths. We used the proposed method with an automatic rate fallback (ARF) algorithm, which is used as a link adaptation. Using our approach reduces the energy used by up to 33.7% under a multipath fading channel environment.

Keywords

OFDM modulation; channel coding; decoding; fading channels; fast Fourier transforms; multipath channels; wireless LAN; ARF algorithm; Hamming distance; automatic rate fallback algorithm; channel decoding; dynamic wordlength calibration; energy reduction FFT processors; fast Fourier transform processor; link adaptation; multipath fading channel environment; wireless LAN; wireless OFDM systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (MWSCAS), 2011 IEEE 54th International Midwest Symposium on

Conference_Location

Seoul

ISSN

1548-3746

Print_ISBN

978-1-61284-856-3

Electronic_ISBN

1548-3746

Type

conf

DOI

10.1109/MWSCAS.2011.6026375

Filename

6026375