一种频谱高效的可见光混合调制方案

Spectral efficient visible-light hybrid modulation scheme

为提高室内可见光通信系统传输性能,提出一种基于广义空间调制技术(GSM)的无载波幅度相位(CAP)-数字脉冲间隔调制(DPIM)混合方案。该方案基于空-时域联合思想,在信号域内将CAP信号加载到DPIM时隙脉冲上构建混合调制信号,在光空域内通过GSM技术同时激活多根天线进行信息传输。推导了可见光高斯信道下GSM-CAP-DPIM混合系统的误帧率理论表达式,仿真验证了解析式的准确性,探究了不同空时域参数选择对系统误帧性能的影响。实验结果表明:频谱效率相同时,GSM-CAP-DPIM混合系统的可靠性优于传统混合调制系统。

In order to improve the transmission performance of indoor visible light communication system,a hybrid scheme of carrierless amplitude and phase(CAP)-digital pulse interval modulation(DPIM)based on generalized spatial modulation(GSM)is proposed.Based on the joint idea of space-time,CAP signals are loaded onto DPIM slot pulses in signal domain to construct mixed modulation signals,and multiple antennas are activated simultaneously through GSM technology in optical domain for information transmission.The theoretical expression of the frame error rate of the GSM-CAP-DPIM hybrid system in visible Gaussian channel is derived.The accuracy of the analytical expression is verified by simulation,and the influence of different space time parameter selection on the system frame error performance is explored.The experimental results show that the reliability of GSM-CAP-DPIM hybrid system is better than that of traditional hybrid modulation system with the same spectral efficiency.