Xie Chenhui, Chen Zexin, Fu Songnian, Liu Wu, He Zhixue, Deng Lei, Tang Ming, Liu Deming
Opt Express. 2018 Jan 8;26(1):367-375. doi: 10.1364/OE.26.000367.
We present the first experimental demonstration of orthogonal frequency division multiplexed (OFDM) modulation using the probabilistic shaping (PS) technique in visible light communication (VLC) systems, in order to increase the achievable information rate (AIR) according to the pre-estimated signal to noise ratio (SNR) of VLC channel. We numerically investigate the performance of PS technique and make a fair comparison with bit-loading technique under different scenarios. By using a phosphor-LED based VLC system with available bandwidth of ~45-MHz, OFDM with PS technique can experimentally realize an AIR of 204.1-Mb/s over 1-m free space transmission, leading to a 26.8% increment in comparison with OFDM using bit-loading technique at the expense of 16% overall forward error correction (FEC) overhead (OH).
我们展示了在可见光通信（VLC）系统中使用概率整形（PS）技术进行正交频分复用（OFDM）调制的首个实验演示，以便根据VLC信道的预估计信噪比（SNR）提高可实现的信息速率（AIR）。我们对PS技术的性能进行了数值研究，并在不同场景下与比特加载技术进行了公平比较。通过使用基于磷光发光二极管（phosphor-LED）且可用带宽约为45 MHz的VLC系统，采用PS技术的OFDM能够在1米自由空间传输中通过实验实现204.1 Mb/s的AIR，与使用比特加载技术的OFDM相比，实现了26.8%的增量，但代价是整体前向纠错（FEC）开销（OH）增加了16%。
