FSO MIMO垂直空时分层码研究及硬件仿真  

Vertical Bell Labs layered space-time for FSO MIMO system and hardware simulation

作　　者：柯熙政[1] 杨利红[1] 葛子叶[1] 

机构地区：[1]西安理工大学自动化与信息工程学院,陕西西安710048

出　　处：《红外与激光工程》2010年第3期473-476,536,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金资助项目(60977054);国防重点实验室基金资助项目(9140C3601010901);陕西省教育厅科技专项基金资助项目(07JK332);陕西省自然科学基金;广东省交通厅科研计划资助项目(2007-26)

摘　　要：在自由空间光通信(FSO)中,多输入多输出(MIMO)可以大大提高频谱利用率。在对FSOMIMO进行分析研究的基础上,提出了垂直分层空时(V-BLAST)结构,建立了该结构的系统模型。分别取不同的MIMO组数,仿真比较了PPM和OOK两种调制方式的系统误码率。运用VHDL语言设计了垂直分层空时结构的编译码,并进行了硬件功能和时序仿真。研究结果表明:在信噪比一定的情况下,PPM调制方式下系统的误码率要低于OOK调制方式下系统的误码率;运用VHDL语言设计的V-BLAST编译码,从硬件功能和时序上验证了FSOMIMO系统的可行性。In free space optical communication （FSO）, the multiple-input multiple-output （MIMO） can improve the spectrum efficiency greatly. The vertical Bell Labs layered space-time （V-BLAST） structure was proposed based on the FSO MIMO technique, and a system model of V-BLAST was established in this paper. Both the system error rate of PPM and OOK modulation were simulated comparatively by taking different number of MIMO groups. The VHDL was used to design the encoding and decoding of VBLAST, and the hardware functions and time sequence were simulated. The results show that the bit error rate of PPM modulation is lower than that of OOK modulation at a given signal-to-noise. The simulations verify the feasibility of the proposed FSO MIMO system.

关 键 词：自由空间光通信 多输入多输出 脉冲位置偏振调制 垂直分层空时码 

分 类 号：TN929[电子电信—通信与信息系统]