OFDM-BOC: A Broadband Multicarrier Navigation Modulation-Based BOC for Future GNSS

Block Scalable OFDM-Based Waveform for NTN Uplink–A Comparative Study of Multiple Candidate Waveforms Over NTN Scenarios Using NR Numerology

“…In [15], OFDM and DFT spread OFDM (DFT-s-OFDM) were compared with digital video broadcasting-satellite-second generation extension (DVB-S2X) defined single-carrier waveform with root raised cosine (RRC) pulse under NTN downlink with nonlinear HPA, which showed that OFDM faces significant performance degradation under nonlinear power amplifier, and an SC waveform option in the downlink can be beneficial. Some other works focused on multicarrier waveform or transmission scheme design in satellite communication systems [16]- [18]. The authors of [16] studied the application of coded OFDM for broadband satellite transmission in the forward link, where successive correction techniques were proposed to compensate for the nonlinear distortions.…”

“…The authors of [17] proposed a pre-distortion-based indexmodulated OFDM (IM-OFDM) for the terrestrial-satellite radio link and showed that it can achieve a better tradeoff among BER performance and HPA efficiency when compared with OFDM and IM-OFDM systems. A recent work proposed an OFDM with binary offset carrier (OFDM-BOC) for GNSS [18], the authors demonstrated that OFDM-BOC has better navigation performance and lower complexity than OFDM through both simulations and analysis. However, only small Doppler shifts were considered in the above mentioned studies, which were not suitable for high mobility NTN uplink scenarios.…”