INVESTIGADORES
CORRAL BRIONES graciela
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Título:
Performance of joint multiuser detection and group decoding for trellis coded DS-CDMA systems
Autor/es:
GRACIELA CORRAL BRIONES; CARMEN E. RODRIGUEZ
Lugar:
Laboratorio de Comunicaciones Digitales, Univ. Nacional de Cordoba, Arg.
Reunión:
Conferencia; VTC 2002-Fall. 2002 IEEE 56th Vehicular Technology Conference, 2002. Proceedings.; 2002
Resumen:
Optimal multiuser detection of trellis coded signals has prohibitive
complexity. A suboptimal concatenated scheme consisting of a maximum a
posteriori (MAP) multiuser interference (MUI) detector followed by a
deinterleaver and a soft trellis decoder has recently received
considerable attention in the literature. We call this scheme
concatenated multiuser detector and trellis decoder (CMDTD). An
alternative to CMDTD is joint multiuser detection and group decoding
(JMDGD). In JMDGD, reduced-state sequence estimation (RSSE) is used to
jointly decode the coding information of a group of users and equalize
the MUI. In this paper we show that JMDGD outperforms CMDTD in
asynchronous trellis-coded DS-CDMA systems over high-interference AWGN
channels. In these channels, the advantage of JMDGD is dramatic in
near-far situations. Furthermore, the performance edge of JMDGD over
CMDTD increases as the MUI increases. In fast fading channels,
simulation results show that JMDGD performs close to CMDTD with
significantly reduced complexity.