Title :
Adaptive pre-equalization in analog heterodyne architectures for wireless LAN
Author :
Coersmeier, Edmund ; Zielinski, Ernst
Author_Institution :
Nokia Res. Center, Bochum, Germany
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;
Conference_Titel :
Radio and Wireless Conference, 2002. RAWCON 2002. IEEE
Print_ISBN :
0-7803-7458-4
DOI :
10.1109/RAWCON.2002.1030129
