Adaptive pre-equalization in analog heterodyne architectures for wireless LAN

Author

Coersmeier, Edmund ; Zielinski, Ernst

Author_Institution

Nokia Res. Center, Bochum, Germany

fYear

2002

fDate

2002

Firstpage

107

Lastpage

110

Abstract

The IEEE802.11a wireless LAN standard defines a high system performance and therefore requires a certain signal accuracy for the OFDM transmitter output. Taking the potential analog low, medium IF and RF filter imperfections into account, it is necessary to pre-equalize the signal stream digitally before transmitting. The paper concentrates on the description of the OFDM transmitter front-end architecture and the adaptive decision-aided pre-equalization in the digital domain. The mathematics of the pre-equalization process are derived from the well known post-equalization respective channel-equalization case. Finally simulation results are presented.

Keywords

OFDM modulation; adaptive equalisers; radio transmitters; radiofrequency filters; wireless LAN; IEEE802.11a standard; IF filter; OFDM transmitter; RF filter; adaptive pre-equalization; analog heterodyne architectures; channel-equalization; digital domain; post-equalization; signal accuracy; wireless LAN; Adaptive filters; Cost function; Digital filters; Equations; Feedback loop; Least squares approximation; Mathematics; OFDM; Transmitters; Wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio and Wireless Conference, 2002. RAWCON 2002. IEEE

Print_ISBN

0-7803-7458-4

Type

conf

DOI

10.1109/RAWCON.2002.1030129

Filename

1030129