Performance Research of Modulation for Optical Wireless Communication System

There are many modulation methods suitable for optical wireless communication. OOK, PPM are adopted widely in optical wireless communication for its high average-power-efficiency. DPPM, DPIM and DH-PIM are three new modulation methods for optical wireless communication, which may be the substitutes of PPM because of their better performance in power efficiency and bandwidth efficiency. In this paper, in combination of the characteristic of the atmospheric optical wireless channel, the bandwidth efficiency, transmission capacity, power efficiency and slot error rate of the typical modulation schemes as OOK, PPM, DPPM, DPIM and DH-PIM for atmospheric optical wireless communications are analyzed. Theoretical analysis and simulation results show that DPPM, DPIM and DH-PIM are more applicable for the future optical wireless communication.

有许多适用于光无线通信的调制方法。开关键控（OOK）和脉冲位置调制（PPM）因其较高的平均功率效率而在光无线通信中被广泛采用。差分脉冲位置调制（DPPM）、数字脉冲间隔调制（DPIM）和双头脉冲间隔调制（DH - PIM）是三种用于光无线通信的新型调制方法，由于它们在功率效率和带宽效率方面表现更优，可能会成为PPM的替代方案。本文结合大气光无线信道的特点，分析了用于大气光无线通信的典型调制方案（如OOK、PPM、DPPM、DPIM和DH - PIM）的带宽效率、传输容量、功率效率和时隙错误率。理论分析和仿真结果表明，DPPM、DPIM和DH - PIM更适用于未来的光无线通信。