首页|Lens-free wavefront shaping method for a diffuse non-line-of-sight link in visible light communication
Lens-free wavefront shaping method for a diffuse non-line-of-sight link in visible light communication
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In this Letter,we propose and experimentally demonstrate a lens-free wavefront shaping method that utilizes synchronized signal block beam alignment and a genetic algorithm[SSBGA]for a diffuse non-line-of-sight[NLOS]visible light commu-nication[VLC]system.The proposed method effectively controls the position and mobility of visible light beams by partitioning spatial light modulator pixels and manipulating beams to converge at distinct spatial positions,thereby enhanc-ing wavefront shaping efficiency,which achieves a significant 23.9 dB optical power enhancement at+2 mm offset,sur-passing the lens-based continuous sequence[CS]scheme by 21.7 dB.At+40° angle,the improvement reaches up to 11.8 dB and 16.8 dB compared to the results with and without lens-based CS,respectively.A maximum rate of 5.16 Gbps is success-fully achieved using bit-power loading discrete multi-tone[DMT]modulation and the proposed SSBGA in an NLOS VLC sys-tem,which outperforms the lens-based CS by 1.07 Gbps and obtains a power saving of 55.6％during the transmission at 4 Gbps.To the best of our knowledge,this is the first time that high-speed communication has been realized in an NLOS VLC system without a lens.
non-line-of-sight,lens-free wavefront shapingvisible light communication
陈超旭、周晓萌、李子薇、沈超、张俊文、施剑阳、迟楠
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Key Laboratory for Information Science of Electromagnetic Waves[MoE],Fudan University,Shanghai 200433,China
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