针对无线光通信系统中L级脉冲位置调制(PPM)技术带宽效率较低的问题,结合L级脉冲位置调制技术和L级脉冲宽度调制(PWM)技术,提出了L级脉冲位置宽度调制(PPWM)技术。该调制技术通过适当降低功率效率提高了带宽效率,分析了PPWM技术的功率效率和带宽效率,在弱湍流信道模型下分析了PPWM调制技术的误包率,并与其他调制技术进行了比较。结果表明L级脉冲位置宽度调制技术具有低误码率、高功率效率、高带宽效率和较低误包率等优点。

In order to improve the bandwidth efficiency of the L-level pulse-position modulation (PPM) scheme used in wireless optical communication, a new modulation scheme, L-level pulse-position-width modulation (PPWM) scheme was proposed based on L-level PPM scheme and L-level pulse-width modulation (PWM) scheme . It increases the bandwidth efficiency through reducing the power efficiency properly. The PPWM signal’s power efficiency and bandwidth efficiency are analyzed and the packet error rate in the weak turbulence channel model is also derived and compared with that in other modulation schemes. The result shows that the L-level PPMPWM scheme has low bit error rate, high power efficiency, better bandwidth efficiency, and low packet error rate.