An adaptive modulation scheme based on 64/16/4QAM modulation is proposed.
The proposed scheme is experimentally demonstrated in the IM/DD MB-OFDM UWBoF system.
The power penalty of the proposed scheme is about 3.6 dB, compared with 64QAM encoded.
The ISFA algorithm is employed in the MB-OFDM UWBoF system based on the proposed scheme.
The receiver sensitivity has been improved about 0.52 dB by using ISFA algorithm.