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Faster-than-Nyquist non-orthogonal frequency-division multiplexing(FTN-NOFDM) is robust against the steep frequency roll-off by saving signalbandwidth. Among the FTN-NOFDM techniques, the non-orthogonal matrix precoding(NOM-p) based FTN has high compatibility with the conventional orthogonalfrequency division multiplexing (OFDM), in terms of the advanced digital signalprocessing already used in OFDM. In this work, by dividing the single band intomultiple sub-bands in the NOM-p-based FTN-NOFDM system, we propose a novelFTN-NOFDM scheme with adaptive multi-band modulation. The proposed schemeassigns different quadrature amplitude modulation (QAM) levels to differentsub-bands, effectively utilizing the low-pass-like channel and reducing thecomplexity. The impacts of sub-band number and bandwidth compression factor onthe bit-error-rate (BER) performance and implementation complexity areexperimentally analyzed with a 32.23-Gb/s and 20-km intensity modulation-directdetection (IM-DD) optical transmission system. Results show that the proposedscheme with proper sub-band numbers can lower BER and greatly reduce thecomplexity compared to the conventional single-band way.

Adaptive Multi-band Modulation for Robust and Low-complexity Faster-than-Nyquist Non-Orthogonal FDM IM-DD System