基于可见光通信的双宽差分脉冲位置调制

Dual Duration Differential Pulse Position Modulation Based on Visible Light Communication

针对车内可见光通信系统高带宽、高功率和低误码率的要求,提出了一种新型的双宽差分脉冲位置调制(Dual Duration Differential Pulse Position Modulation,DD-DPPM)方式,对其符号结构、带宽需求、平均发射功率及误时隙率进行了分析计算,并与开关键控(On-Off Keying,OOK)调制、脉冲位置调制(Pulse Position Modulation,PPM)、差分脉冲位置调制(Differential Pulse-Position Modulation,DPPM)、双头脉冲间隔调制(Dual Header Pulse Interval Modulation,DH-PIM)和反向双头脉冲间隔调制(Reverse Dual Header Pulse Interval Modulation,RDH-PIM)5种调制方式进行了仿真对比。结果表明:DD-DPPM具有比OOK和RDH-PIM更强的抗干扰能力,以及比DPPM、DH-PIM更高的带宽利用率和平均发射功率,是一种综合性能优良的调制方式,在可见光通信系统中具有一定的应用前景。

A novel modulation scheme called Dual Duration Differential Pulse Position Modulation ( DD-DPPM) is proposed on the basis of high bandwidth , high power and low slot error rate requirements of Visible Light Communication (VLC) system in vehicle.Its symbol structure, bandwidth requirement, average transmission power and slot error rate are analyzed and computed .Five kinds of modulation such as On-Off Keying ( OOK ) , Pulse Position Modulation ( PPM ) , Differential Pulse-Position Modulation (DPPM), Dual Header Pulse Interval Modulation (DH-PIM) and Reverse Dual Header Pulse Interval Modulation ( RDH-PIM) are simulated and compared for analysis .The theoretical and simulation results indicate that DD-DPPM has better slot error performance than OOK and RDH-PIM, offers higher band-width efficiency and average transmission power than DPPM and DH-PIM.As a result of the above bene-fits, the proposed DD-DPPM is a kind of modulation with excellent comprehensive performance , and it has a certain application prospect in the VLC system .