Extrinsic information transfer charts for narrow-band multiple access
Paper i proceeding, 2002
Convergence analysis of iterative detectors for narrowband multiple access is performed by using extrinsic
information transfer charts. The system has no bandwidth expansion, so K users are using the same bandwidth as one single user. The load (the number of bits
per channel use) of the system is therefore higher than
the load in, for example, conventional CDMA systems.
The analysis provide useful guidelines how to combine
outer codes with the chosen mapper for diﬀerent loads
of the system. Both memoryless mappers and diﬀerential mappers are evaluated. The limitations of the
system measured in the maximum number of users and
the required SNR for diﬀerent scenarios are presented.