Precoded Non-Orthogonal Frequency Division Multiplexing with Subcarrier Index Modulation
arXiv:2608.00645 · doi:10.1109/VTC2022-Spring54318.2022.9860537
Abstract
In this paper, we propose a novel precoded non-orthogonal frequency division multiplexing (NOFDM) with subcarrier index modulation (SIM) to increase spectral efficiency for multicarrier systems. The proposed NOFDM-SIM scheme is constituted by a filterbank multicarrier system under reduced subcarrier spacing, where precoded index modulated symbols are mapped onto the subcarriers. The detrimental effects of inter-carrier interference (ICI) resulting from the non-orthogonality between subcarriers are efficiently mitigated with the aid of eigenvalue-decomposition-based precoding. Our simulation results demonstrate that the proposed precoded NOFDM-SIM system exhibits a similar peak-to-average power ratio to OFDM and OFDM-SIM counterparts while achieving the bit error ratio limit of zero-ICI OFDM.
5 pages, 4 figures, Preprint (accepted version) for publication in IEEE 95th Vehicular Technology Conference (IEEE VTC2022-Spring), 2022