摘要
多输入多输出(MIMO)系统在不增加频谱资源和发射功率的情况下,能够成倍提高现有系统信道容量的特点,本文将MIMO技术应用于大气激光通信。提出了基于MIMO的大气激光通信并建立了系统模型,详细的阐述了涉及到的关键技术。最后分析了该系统的信道容量变化情况,并通过仿真实验说明了信道容量及误字率与天线数量之间的关系。结果表明:随着天线数量的增加系统的信道容量增大,误码率减小,而且能有效克服大气湍流所产生的闪烁效应。同时在天线数量乘积相同的情况下,接收分集的效果要比发送分集的效果明显。
Multiple- input multiple- output （MIMO） system can raise the channel capacity of-existing communication system by times without using more spectrum resource and emission power. So in this paper MIMO technology is applied to atmosphere laser communication. The notion of atmosphere laser communication based on MIMO is put forward. The system model is constructed, and the critical technique is expatiated in detail. Then the channel capacity is analyzed, and the simulation results explains the relation between channel capacity and the number of the antennas, and the relation between character error rate and the number of the antennas. As a result, with the augment of antenna number, system channel capacity increases, the error rate is improved effectively, and flicker effect which is come into being by atmosphere turbulence is gotten over. While antenna number product is equivalent, receiver diversity is more visible than delivery diversity.
出处
《激光杂志》
CAS
CSCD
北大核心
2008年第3期52-54,共3页
Laser Journal
基金
国家科技支撑计划(2006BAF01A21)
国防重点实验室基金项目(9140C3601010701)
陕西省教育厅科技专项基金(07JK332)
陕西省自然科学基金资助(2007F12)
广东省交通厅科技计划资助2007-26)
关键词
MIMO
大气激光通信
分集
MIMO
atmosphere laser communication
diversity
