Noncoherent iterative decoding of spectrally efficient coded modulations

We consider possible solutions for noncoherent decoding of concatenated codes with spectrally efficient modulations. Serially concatenated coding structures and possible schemes derived from turbo trellis coded modulation (T-TCM) are considered. In both cases, at the receiver side we consider joint detection and decoding. Since taking into account an augmented channel memory leads to an intolerable trellis size, we consider a recently proposed state-reduction technique