Inter-Vector Interference Cancellation for Orthogonal Signal Division Multiplexing in Doubly-Selective Channels

Orthogonal Signal-Division Multiplexing (OSDM) is a generalized scheme that bridges the gap between orthogonal frequency-division multiplexing and single-carrier modulation with frequency-domain equalization. However, OSDM systems suffer significant performance degradeation due to inter-vector interference (IVI) in doubly-selective channels. To mitigate this issue, this paper proposes two IVI cancellation techniques tailored for OSDM systems. The one-off IVI cancellation only targets the current demodulated vector, whereas the combined IVI cancellation considers all demodulated vectors associated with the current symbol vector. Importantly, both IVI cancellation methods possess low-complexity equalization realization. Simulation results validate the effectiveness of these IVI cancellation schemes in enhancing system performance.