自由空间光多输入多输出系统中的差分空时码  

Differential Space Time Code for Free Space Optical Multiple Input Multiple Output System

作　　者：谌娟[1] 柯熙政[1] 程婷[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：《光学学报》2013年第2期37-42,共6页Acta Optica Sinica

基　　金：国家自然科学基金(60977054);教育厅产业化培育项目(2010JC17);陕西省科技统筹创新工程计划项目(2011KTCQ01-31)资助课题

摘　　要：激光在大气中传播时会受大气湍流的影响,而恶劣的大气环境条件会使信道估计的难度增加。根据ChadiAbou-Rjeily的编码思想,通过引入置换矩阵代替了实数域Alamouti码中符号的负数形式,采用二进制脉冲位置调制,提出一种无需信道估计且适合自由空间光通信的差分空时码方案。仿真结果表明,该方法和需要信道估计的Alamouti码相比,可以获得相同的分集增益,比较简单而且切实可行。Laser is always affected by atmospheric turbulence in atmosphere transmission, and channel estimation will become more difficult at poor atmospheric condition. According to Chadi Abou-Rjeily＇s coding idea, introducing permutation matrix instead of negative form of symbols in the real area Alamouti method, utilizing binary pulse position modulation, a differential space-time code scheme that does not require channel estimates for free space optical communication is proposed. The simulation results show that, compared with Alamouti coding which requires channel estimates, this method can obtain the same diversity gain. At the same time, it is relatively simple and more feasible in practice.

关 键 词：光通信 差分空时码 大气湍流 二进制脉冲位置调制 

分 类 号：TN929.12[电子电信—通信与信息系统]