Conference Proceeding

Trellis-based multiuser receivers for asynchronous trellis coded DS-CDMA systems

Univ. Nacional de Cordoba
02/2001; DOI:10.1109/ICC.2001.937355 ISBN: 0-7803-7097-1 pp.831 - 836 vol.3 In proceeding of: Communications, 2001. ICC 2001. IEEE International Conference on, Volume: 3
Source: IEEE Xplore

ABSTRACT We propose a new reduced-complexity multiuser receiver for
asynchronous trellis-coded CDMA systems in AWGN channels. Based on the
coding information of a subset of users and the set partitioning
principles inherent in TCM, reduced-state trellises are constructed. The
Viterbi algorithm is thus used to jointly decode the trellis codes of
this subset of users and equalize the multiuser interference of the
channel. As a special case of the proposed receiver, we study a
structure that decodes only one user and equalizes the multiuser
interference. Simulation results show that the performance of the new
reduced complexity receiver approaches the trellis-coded single-user
bound for both low and high-interference channels. Moreover, we compare
the performance of the proposed receiver with that of previously
proposed suboptimal structures. Our scheme is found to significantly
outperform previously known suboptimal structures

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Keywords

asynchronous trellis-coded CDMA systems
 
AWGN channels
 
coding information
 
complexity receiver approaches
 
decode
 
decodes
 
high-interference channels
 
low
 
new
 
new reduced-complexity multiuser receiver
 
proposed receiver
 
reduced-state trellises
 
Simulation results
 
special case
 
subset
 
trellis codes
 
Viterbi algorithm