Equalization scheme for OFDM systems in long delay spread channels

Author

Yu, Heejung ; Kim, Myung-Soon ; Taehyun Jeori ; Lee, Sok-Kyu

Author_Institution

Div. of Mobile Telecommun. Res., Electronics & Telecommun. Res. Inst., Daejeon, South Korea

Volume

2

fYear

2004

fDate

5-8 Sept. 2004

Firstpage

1297

Abstract

A decision feedback equalizer (DFE) type of equalization scheme is proposed to mitigate the effect of delay spread for orthogonal frequency division multiplexing (OFDM) systems. The performance degradation is severe in case that the delay spread of wireless channels is longer than a cyclic prefix (CP) due to the effect of inter-symbol interference (ISI) and inter-carrier interference (ICI). The effect of ICI and ISI is analytically described in matrix equations which includes signal-to-noise ratio (SNR) degradation for a given channel condition. The proposed scheme improves the performance using decision feedback mechanism without increasing the length of CP, which preserves the system efficiency for the OFDM.

Keywords

OFDM modulation; equalisers; intersymbol interference; matrix algebra; radio networks; telecommunication channels; OFDM system; decision feedback equalizer; intercarrier interference; intersymbol interference; long delay spread channel; orthogonal frequency division multiplexing; Decision feedback equalizers; Degradation; Delay effects; Delay systems; Digital video broadcasting; Fading; Frequency domain analysis; Interference; OFDM modulation; Wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor and Mobile Radio Communications, 2004. PIMRC 2004. 15th IEEE International Symposium on

Print_ISBN

0-7803-8523-3

Type

conf

DOI

10.1109/PIMRC.2004.1373907

Filename

1373907