弱湍流下Turbo码编码数字脉冲间隔调制差错性能分析  

Analysis of Error Performance for Turbo Coded Digital Pulse Interval Modulation under Weak Turbulence

作　　者：朱银兵[1] 王红星[2] 张磊[2] 张铁英[2] 

机构地区：[1]海军工程大学导航工程系,湖北武汉430033 [2]海军航空工程学院电子信息工程系,山东烟台264001

出　　处：《中国激光》2007年第9期1245-1249,共5页Chinese Journal of Lasers

摘　　要：数字脉冲间隔调制（DPIM）的符号长度变化不固定，因而分析该调制方式在Turbo码编码下的差错性能存在困难。在建立分析模型和推导差错率的基础上，在弱湍流信道条件下仿真分析了Turbo码编码前后的系统差错性能，同时与高斯信道条件下的系统差错性能进行了比较。仿真分析结果表明，弱湍流信道条件下的系统差错性能不如高斯信道条件下的系统差错性能，但在两种信道条件下，引入Turbo码编码技术均可获得3～6dB的编码增益，能够有效改善系统的差错性能，具有良好的军事应用价值。The symbol length of digital pulse interval modulation （DPIM） is variable, so there are some difficulties to analyze error performances of Turbo coded DPIM. After the analytic model is set up and the error rate is derived, the system error performances of uncoded and Turbo coded DPIM are simulated and analyzed under weak turbulence channel, and the system error performances under Gaussian channel are simulated for comparison. The results show that error performances under weak turbulence channel are inferior to those under Gaussian channel, but for the two channels, introduction of Turbo code can get the code gain of 3-6 dB, which improves the error performance of system effectively and has applied value for military communications.

关 键 词：光通信 无线光通信 TURBO码 湍流 误码率 

分 类 号：TN929.12[电子电信—通信与信息系统] TN249[电子电信—信息与通信工程]