Title :
Frequency-domain MMSE turbo equalization of multilevel coded QAM-convergence in real fields
Author :
Kansanen, Kimmo ; Matsumoto, Tad ; Schneider, Christian ; Thoma, Reiner
Author_Institution :
Oulu Univ.
Abstract :
Convergence properties of frequency domain turbo equalization with multilevel bit-interleaved coded modulation (MLBICM) and bit-interleaved coded modulation (BICM) are studied in measured quasi-static fading channels by the means of semi-analytical convergence analysis. Spatial channel parameters are matched to the reached mutual information on a per-measurement basis and trends in the behavior of the equalizer are obtained, when the channel characteristics, in terms of transmit and receive side azimuth spreads, change. Robust convergence of frequency-domain turbo equalization combined with multilevel BICM is demonstrated through the convergence analysis. Three channel codes are evaluated in the measurement-based simulation showing the effects of outer code selection
Keywords :
channel coding; convergence of numerical methods; equalisers; fading channels; frequency-domain analysis; interleaved codes; least mean squares methods; modulation coding; quadrature amplitude modulation; turbo codes; MLBICM; QAM-convergence; frequency-domain MMSE turbo equalization; minimum mean square error; multilevel bit-interleaved coded modulation; quadrature amplitude modulation; quasistatic fading channels; spatial channel parameter; Azimuth; Convergence; Equalizers; Fading; Frequency domain analysis; Frequency measurement; Interleaved codes; Modulation coding; Mutual information; Robustness;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2005. PIMRC 2005. IEEE 16th International Symposium on
Conference_Location :
Berlin
Print_ISBN :
9.7838007291e+012
DOI :
10.1109/PIMRC.2005.1651595
