Wang Fubin, Yang Fang, Song Jian
Opt Express. 2020 Jul 6;28(14):21202-21209. doi: 10.1364/OE.397831.
When the generalized spatial modulation (GSM) is applied to visible light communication (VLC), radio frequency (RF) technologies, such as constellation designs, should be modified for the ergodic VLC channel, which is different from that in typical RF environments. In this paper, constellations of amplitude-phase modulation (APM) symbols are optimized for GSM-based VLC systems in which optical signals must be real-valued and non-negative, while the ergodic VLC channel and the random characteristic of receiver locations are also considered. The algorithm of statistically convergent gradient descent (SCGD) is adopted for the maximization of coded modulation average mutual information (CM-AMI), and superior performances of optimal constellations are verified by numerical simulations.
当将广义空间调制（GSM）应用于可见光通信（VLC）时，诸如星座设计等射频（RF）技术应针对遍历VLC信道进行修改，这与典型RF环境中的信道不同。本文针对基于GSM的VLC系统优化了幅度-相位调制（APM）符号的星座，在该系统中光信号必须是实值且非负的，同时还考虑了遍历VLC信道和接收端位置的随机特性。采用统计收敛梯度下降（SCGD）算法来最大化编码调制平均互信息（CM-AMI），并通过数值模拟验证了最优星座的优越性能。
