Carrier-less amplitude and phase modulated visible light communication system based on a constellation-shaping scheme
In this Letter, we propose a novel constellation-shaping carrier-less amplitude and phase (CAP) modulation scheme to alleviate the systematic nonlinearity in visible light communication (VLC) systems. A simple geometric transformation shaping method is employed to convert the normal square lattice constellation into multiple circular constellations. The feasibility and performance are investigated and experimentally demonstrated by a 1.25 Gb/s CAP-modulated VLC system. The results indicate that the circular constellation has better resistance to systematic nonlinearity compared with a rectangular constellation. The dynamic range of input signal peak-to-peak values promotes 20% at a low bias voltage nonlinear area and 50% at a high bias voltage nonlinear area. To the best of our knowledge, this is the first time constellation-shaping CAP has ever been reported in indoor high data rate VLC systems.
Mengjie Zhang：State Key Lab of ASIC, Department of Communication Science and Engineering, Fudan University, Shanghai 200433, China
Siyuan Chen：State Key Lab of ASIC, Department of Communication Science and Engineering, Fudan University, Shanghai 200433, China
and Nan Chi：State Key Lab of ASIC, Department of Communication Science and Engineering, Fudan University, Shanghai 200433, China
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Zhixin Wang, Mengjie Zhang, Siyuan Chen, and Nan Chi, "Carrier-less amplitude and phase modulated visible light communication system based on a constellation-shaping scheme," Chinese Optics Letters 15(3), 030602 (2017)