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针对脉冲位置调制(PPM)和数字脉冲间隔调制(DPI M),以及定长数字脉冲间隔调制(FDPI M)等方法存在的问题,提出了一种新的双脉冲间隔调制(DP-PI M)。在给出其符号结构的基础上,分析了带宽需求、传输容量和平均发射功率,推导出了弱湍流信道下的误包率模型,并与PPM,DPI M,FDPI M和开关键控(OOK)调制等方法进行了比较。结果表明,DP-PI M不仅比FDPI M和PPM显著缩短了符号长度,提高了带宽效率和传输容量,而且与DPI M,双头脉冲间隔调制(DH-PI M)和双幅度脉冲间隔调制(DAPI M)一样具有内置符号同步能力,同时通过固定符号长度,克服了缓存器可能出现的冗位或溢位等问题,因而在无线光通信系统中将具有一定的应用前景。
Aiming at the existing problems such as pulse position modulation (PPM), digital pulse interval modulation (DPI M) and fixed length digital pulse interval modulation (FDPI M), a new double pulse interval modulation (DP-PI M) . Based on the symbol structure, the bandwidth demand, transmission capacity and average transmission power are analyzed. The packet error rate model is derived under weak turbulence channel. The model is also combined with PPM, DPI M, FDPI M and OOK ) Modulation and other methods were compared. The results show that DP-PI M not only shortens the symbol length and improves the bandwidth efficiency and transmission capacity, but also with DPI M, double-head pulse interval modulation (DH-PI M) and double amplitude pulse interval modulation DAPI M) has the same ability of built-in symbol synchronization and overcomes the possible redundancy or overflow of the buffer through the fixed symbol length. Therefore, it has certain application prospect in the wireless optical communication system.