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Space-time shift keying-aided orthogonal time frequency spacemodulation-based multiple access (STSK-OTFS-MA) is proposed for reliable uplinktransmission in high-Doppler scenarios. As a beneficial feature of ourSTSK-OTFS-MA system, extra information bits are mapped onto the indices of theactive dispersion matrices, which allows the system to enjoy the joint benefitsof both STSK and OTFS signalling. Due to the fact that both the time-, space-and DD-domain degrees of freedom are jointly exploited, our STSK-OTFS-MAachieves increased diversity and coding gains. To mitigate the potentiallyexcessive detection complexity, the sparse structure of the equivalenttransmitted symbol vector is exploited, resulting in a pair of low-complexitynear-maximum likelihood (ML) multiuser detection algorithms. Explicitly, weconceive a progressive residual check-based greedy detector (PRCGD) and aniterative reduced-space check-based detector (IRCD). Then, we derive both theunconditional single-user pairwise error probability (SU-UPEP) and a tight biterror ratio (BER) union-bound for our single-user STSK-OTFS-MA system employingthe ML detector. Furthermore, the discrete-input continuous-output memorylesschannel (DCMC) capacity of the proposed system is derived. The optimaldispersion matrices (DMs) are designed based on the maximum attainablediversity and coding gain metrics. Finally, it is demonstrated that ourSTSK-OTFS-MA system achieves both a lower BER and a higher DCMC capacity thanits conventional spatial modulation (SM) {and its orthogonal frequency-divisionmultiplexing (OFDM) counterparts. As a benefit, the proposed system strikes acompelling BER vs. system complexity as well as BER vs. detection complexitytrade-offs.

Space-Time Shift Keying Aided OTFS Modulation for Orthogonal Multiple Access