大气激光通信中几种调制方式的性能比较

Performance Comparison of Modulation Schemes for Atmospheric Optical Communication

为选择适合大气激光通信的信道调制方式,对湍流信道下的大气激光通信系统中的OOK,PPM,DPPM和DPIM调制方式的包误码率(PER)和带宽性能进行了仿真分析.结果表明,DPIM的PER性能最好,PPM和DPPM次之,OOK最差.当调制参数较小时,PPM的带宽性能较好;当调制参数较大时,DPPM和DPIM的带宽性能较好.除OOK之外的3种调制方式需要的功率都较小.

The performances of modulation schemes, OOK （on off key）, PPM （pulse position modulation）, DPPM （differential pulse position modulation ） and DPIM （digital pulse interval modulation）, used in optical communication over the atmospheric turbulence channel were analyzed and compared in terms of packet error rate （PER） and bandwidth efficiency. is the best followed by PPM and DPPM, and OOK is the worst. With regard In terms of PER, DPIM to bandwidth efficiency, PPM is desirable with a small modulation parameter, and DPPM and DPIM are good with a large modulation parameter. All these schemes, except OOK, require a small laser power.