Title :
Performance of iterative CDMA receivers with channel estimation in multipath environments
Author :
Wehinger, Joachim ; Muller, Ralf ; Loncar, Marko ; Mecklenbräuker, Christoph
Author_Institution :
Vienna Telecommun. Res. Center, Austria
Abstract :
Most works published on iterative CDMA receivers assume perfect channel knowledge or very simple channel models like the flat-fading channel. We want to extend the scope to multipath propagation scenarios and suggest an iterative scheme with channel estimation in the uplink of a chip-synchronous CDMA system. Channel estimates rely on pilot symbols and a posteriori probabilities on code bits from a SISO decoder. The multiuser detector is implemented as a parallel interference canceler with post-MMSE filtering. We present simulation results of the performance in different multipath scenarios, including real channel sounder measurements.
Keywords :
channel estimation; code division multiple access; decoding; filtering theory; interference suppression; iterative methods; least mean squares methods; multipath channels; multiuser detection; probability; radio receivers; SISO decoder; a posteriori probabilities; channel estimation; chip-synchronous CDMA system; iterative CDMA receivers; multipath propagation; multiuser detector; parallel interference canceler; post-MMSE filtering; soft-input soft-output decoder; Acoustic propagation; Channel estimation; Convolutional codes; Detectors; Fading; Filtering; Iterative algorithms; Iterative decoding; Multiaccess communication; Quadrature phase shift keying;
Conference_Titel :
Signals, Systems and Computers, 2002. Conference Record of the Thirty-Sixth Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-7576-9
DOI :
10.1109/ACSSC.2002.1197017