摘要
信道容量是通信系统能够达到的最大传输速率,是衡量通信系统通信能力的重要指标之一。在建立了光多输入多输出(MIMO)的信道模型之后,结合脉冲位置调制(PPM)分析了光MIMO系统的平均容量和中断容量;在无背景辐射的条件下,分别推导出了有无衰落时光MIMO平均容量封闭形式的近似表达式。在相同发射功率和传输带宽条件下,得到了光MIMO技术能成倍提高现有系统信道容量的结论。通过Monte Carlo仿真实验进一步证明了理论的正确性。
Channel capacity is the maximal transmission ratio of the communication system. It is one of the important indexes to measuring system communication ability. The channel model of the optical multi-in and multi- out (MIMO) system is established, then the ergodic channel capacity and outage capacity of optical MIMO system are analyzed by combining pulse position modulation (PPM). And then, the in-closed approximate expressions of ergodic channel capacity are deduced with and without fading in that the channel capacity of optical MIMO system can be the case of no background radiation, respectively. It shows doubly raised under the condition of same sending power and bandwidth. Its feasibility is confirmed using Monte Carlo simulation experiment
出处
《光学学报》
EI
CAS
CSCD
北大核心
2012年第3期28-33,共6页
Acta Optica Sinica
基金
甘肃省自然科学基金(0914ZTB097)
甘肃省高校基本科研业务费项目(1114ZTC142)资助课题
关键词
无线光通信
多输入多输出
脉冲位置调制
信道容量
wireless optical communication
multi-in and multi-out (MIMO)
pulse-position modulation (PPM)
channel capacity
作者简介
王惠琴(1972-),女,博士,教授,主要从事大气激光通信及光MIMO技术。E-mail:15117024169@139.corn0306003-1