  Unsourced random access (URA) is a particular form of grant-free
uncoordinated random access wherein the users' identities are not associated to
specific waveforms at the physical layer. Tensor-based modulation (TBM) has
been recently advocated as a promising technique for URA due to its ability to
support a large number of active users transmitting simultaneously by
exploiting tensor decomposition for user separation. We propose a novel URA
scheme that builds upon TBM by splitting the transmit message into two
sub-messages. This first part is modulated according to a TBM scheme, while the
second is encoded using a coherent non-orthogonal multiple access (NOMA)
modulation. At the receiver side, we exploit the advantages of forward error
correction (FEC) coding and interference cancellation techniques. We compare
the performances of the introduced scheme with state-of-the-art URA schemes
under a quasi-static Rayleigh fading model, proving the energy efficiency and
the fading robustness of the proposed solution.
