Iterative multi-user detection of trellis code multiple access using a posteriori probabilities
Paper i proceeding, 2001
Iterative detectors for trellis code multiple access (TCMA) are
suggested as an alternative to the joint maximum likelihood sequence detector
(MLSD). Interleavers are introduced in the TCMA system as a new
feature to separate the users. This implies that MLSD is now too complex
to implement. The conventional interference cancellation (IC) detector has
lower complexity, but its performance is shown to be far from acceptable.
Another iterative detector having close to single user performance is therefore
suggested. Instead of using IC, this detector updates the branch metric
for every iteration and avoids the standard Gaussian approximation. It is
also shown that the users can be detected when the interleaver is the only
user specific feature in the TCMA system.