Detrimental effects of filtering in an OFDM system using pilot based channel estimation

Author

Ho, Chin Keoug ; Sun, Sumei ; Farhang-Boroujeny, B.

Author_Institution

Inst. for Commun. Res., Singapore, Singapore

Volume

3

fYear

2002

fDate

15-18 Sept. 2002

Firstpage

1316

Abstract

We investigate the effects of performing channel estimation on an OFDM system in AWGN and Rayleigh channels using non-ideal interpolating and decimating filters. Pilots are used to estimate the combined response of the channel and the filters. By making use of the standard Gaussian approximation to the interference for the AWGN channel, we illustrate how to estimate the symbol error rate of an M-QAM system. By using an improved Gaussian approximation for the Rayleigh fading channel for error rate estimation, we show that this is equivalent to making the assumption that the interference is Gaussian noise experienced in a Rayleigh fading channel. It is shown that the predicted symbol error rate is close to that produced by simulations for a 64QAM modulated OFDM system based on the wireless LAN system described in IEEE 802.11a.

Keywords

AWGN channels; OFDM modulation; Rayleigh channels; channel estimation; error statistics; filtering theory; interpolation; parameter estimation; quadrature amplitude modulation; radiofrequency interference; wireless LAN; AWGN channels; Gaussian approximation; IEEE 802.11a; M-QAM system; OFDM system; QAM; Rayleigh channels; decimating filters; filtering; interpolating filters; pilot based channel estimation; symbol error rate; wireless LAN; AWGN; Channel estimation; Error analysis; Fading; Filtering; Filters; Gaussian approximation; Interference; OFDM; Rayleigh channels;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor and Mobile Radio Communications, 2002. The 13th IEEE International Symposium on

Print_ISBN

0-7803-7589-0

Type

conf

DOI

10.1109/PIMRC.2002.1045242

Filename

1045242