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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。
Aiming at the requirements of high bandwidth, high power and low bit error rate of visible light communication system in vehicle, a new type of Dual Duration Differential Pulse Position Modulation (DD-DPPM) is proposed. Its symbolic structure, Bandwidth requirement, average transmission power and error time-slot rate were analyzed and compared with the on-off keying (OOK) modulation, pulse position modulation (PPM), differential pulse- (Modulation, Position Modulation, DPPM), Dual Header Pulse Interval Modulation (DH-PIM) and Reverse Dual Header Pulse Interval Modulation (RDH-PIM) . The results show that DD-DPPM has better anti-interference ability than OOK and RDH-PIM, and has higher bandwidth utilization and average transmit power than DPPM and DH-PIM. It is an integrated modulation method with excellent performance in visible light Communication system has a certain application prospects.