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在无线光通信中,为解决脉冲位置调制(PPM)需要符号同步和数字脉冲间隔调制(DPIM)符号长度不固定造成调制器等待或缓冲器溢出的问题,提出了一种新的调制方式一定长双幅度脉冲间隔调制(FDAPIM),分析了它的符号结构、发射功率、带宽需求以及在高斯白噪声下的差错性能,并和开关键控(OOK)、脉冲位置调制(PPM)、数字脉冲间隔调制(DPIM)、定长数字脉冲间隔调制(FDPIM)等调制方式进行了比较。理论分析与仿真结果表明,FDAPIM的误包率劣于PPM和DPIM,接近于FDPIM,但明显优于OOK。虽然FDAPIM的带宽要求较高,但其带宽效率和功率效率都优于FDPIM,且不需要符号同步,相对于PPM系统,实现的复杂性大大简化;相对于DPIM,其符号长度固定,不会引起调制器等待或缓冲器溢出。因此FDAPIM应用于无线光通信系统具有一定优势。
In wireless optical communications, a new modulation scheme is proposed to solve the problem that the pulse position modulation (PPM) requires symbol synchronization and the length of the DPIM symbol is not fixed to cause the modulator to wait or the buffer to overflow. This paper analyzes the symbol structure, transmit power, bandwidth requirement and error performance under Gaussian white noise in double amplitude pulse interval modulation (FDAPIM), and compares it with OOK, PPM, Modulation (DPIM), fixed-length digital pulse interval modulation (FDPIM) and other modulation methods are compared. Theoretical analysis and simulation results show that the packet error rate of FDAPIM is worse than that of PPM and DPIM, which is close to FDPIM, but it is obviously better than OOK. Although FDAPIM requires a higher bandwidth, its bandwidth efficiency and power efficiency are superior to FDPIM and symbol synchronization is not required. Compared with the PPM system, the complexity of implementation is greatly simplified. The symbol length of DPAPIM is fixed and does not cause Modulator waits or buffer overflows. Therefore FDAPIM has some advantages for wireless optical communication system.