Orthogonal Circulant Multiplexing based on the Chirp-Like Polyphase Sequence in Short-Reach IM/DD Systems

Abstract

We propose a novel orthogonal circulant multiplexing technique based on the chirp-like polyphase sequence and show in 115.8-Gbit/s IM/DD experiments with 10-GHz-class devices that this scheme outperforms OFDM, DFT-spread OFDM, OCT-precoded OFDM and OCDM.

Transceiver Design for 6G Compatible CP-less Multi-User Orthogonal Chirp Division Multiplexing System with Physical Layer Security

“…The OCDM spread spectrum technique has elicited substantial interest for its applicability in next-generation, or 6G, wireless communication networks. The authors of [13][14][15][16][17][18] performed a comprehensive study on orthogonal time frequency space (OTFS) and OCDM to evaluate their performance in submarine audio communication channels. With perfect channel state information (CSI) available at the receiver, the OTFS and OCDM schemes greatly outperformed OFDM in their study.…”