无线光通信双幅度脉冲位置调制

无线光通信脉冲位置调制(PPM)的功率利用率虽然很高,但带宽需求也非常高,在无线光通信系统中,应当充分考虑带宽需求和功率利用率的平衡问题.针对该问题,提出了一种新的双幅度脉冲位置调制(DAPPM).在给出了其符号结构之后,分析了其带宽利用率.然后,推导了弱湍流信道模型下DAPPM的误时隙率和误包率,并与OOK、PPM、DPIM和DAPIM等调制方式进行了比较.结果表明,在相同的位分辨率条件下,DAPPM的误包率虽然高于PPM和DPIM,但明显优于OOK和DAPIM.同时,DAPPM去除了PPM中冗余的时隙,且平均长度比DPIM短,从而获得了比DPIM更高的带宽利用率.

Dual- amplitude pulse position modulation for optical wireless communication

Though possessing good power efficiency,pulse position modulation (PPM) has also a high bandwidth requirement.The balance of bandwidth and power efficiency has to be considered for optical wireless communication.This paper presents a new dual-amplitude pulse position modulation (DAPPM) on the basis of PPM.After introducing symbol structure,bandwidth efficiency is studied.Based on weak turbulence channel model,the slot error rate and packet error rate are derived,and compared with OOK,PPM,DPIM and DAPIM.Simulations show that error rate of DAPPM is inferior to that of PPM and DPIM,but obvi- ously superiors to that of OOK and DAPIM.Moreover,removing the redundant slots of PPM,DAPPM has better bandwidth efficiency than DPIM and PPM.