Adaptive modulation and intra-symbol frequency-domain averaging scheme for multiband OFDM UWB over fiber system

作者：He, Jing^*; Li, Teng; Wen, Xuejie; Deng, Rui; Chen, Ming; Chen, Lin

来源：Optics Communications, 2016, 358: 45-53.

DOI：10.1016/j.optcom.2015.09.021

• Multiband orthogonal frequency division multiplexing
• Ultra-vvicleband over fiber system
• Frequency-selective fading
• lnter-subcarriers mixing interference
• Adaptive modulation

To overcome the unbalanced error bit distribution among subcarriers caused by inter-subcarriers mixing interference (ISMI) and frequency selective fading (FSF), an adaptive modulation scheme based on 64/16/ 4QAM modulation is proposed and experimentally investigated in the intensity-modulation direct-detection (IM/DD) multiband orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband (UWB) over fiber system. After 50 km standard single mode fiber (SSMF) transmission, at the bit error ratio (BER) of 1 x 10(-3), the experimental results show that the power penalty of the IM/DD MB-OFDM UWBoF system with 64/16/4QAM adaptive modulation scheme is about 3.6 dB, compared to that with the 64QAM modulation scheme. Moreover, the receiver sensitivity has been improved about 0.52 dB when the intra-symbol frequency-domain averaging (lSFA) algorithm is employed in the IM/DD MBOFDM UWBoF system based on the 6411614QAM adaptive modulation scheme. Meanwhile, after 50 km SSEV1[ transmission, there is a negligible power penalty in the adaptively modulated IM/DD MB-OFDM UWBoF system, compared to the optical back-to-back case.

• 出版日期2016-1-1
• 单位湖南大学