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针对无线光通信系统中反向差分脉冲位置调制(RDPPM)功率利用率较低以及差错性能较差等问题,结合反向脉冲宽度调制方式(RPWM)与RDPPM,提出了一种新型组合调制方式,即反向差分脉冲位置宽度调制(RDPPWM)。研究分析了RDPPWM的符号结构、平均发射功率、带宽需求以及在理想加性高斯白噪声(AWGN)干扰下的误包率,并与开关键控(OOK)、RDPPM、RPWM等调制方式进行了比较。仿真结果表明,RDPPWM可以获得较高的功率利用率,增加了信道容量,降低了带宽需求,且不需要符号同步;在相同信号接收功率-28 d Bm的条件下,RDPPM的误包率是2.2×10-8,但是RDPPWM的误包率却可以降低至2.6×10-12。故RDPPWM为无线光通信的调制技术提供了一种新的选择。
Aiming at the problems of poor power utilization and poor error performance of RDPPM in wireless optical communication system, a new combined modulation scheme is proposed based on RPWM and RDPPM. Namely reverse differential pulse position width modulation (RDPPWM). The symbol structure, average transmit power, bandwidth requirement and packet error rate under ideal additive white Gaussian noise (AWGN) interference are analyzed and compared with modulation methods such as OOK, RDPPM and RPWM . Simulation results show that RDPPWM can achieve higher power utilization rate, increase channel capacity and reduce bandwidth requirement, and does not require symbol synchronization. Under the same signal reception power of -28 d Bm, the packet error rate of RDPPM is 2.2 × 10-8, but the packet error rate of RDPPWM can be reduced to 2.6 × 10-12. Therefore, RDPPWM provides a new option for the modulation technology of wireless optical communications.