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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3~6 dB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.
Therefore, it is difficult to analyze the error performance of this modulation scheme under the Turbo coding.On the basis of establishing the analysis model and deriving the error rate, the simulation analysis is carried out under weak turbulence channel conditions The system error performance before and after Turbo code is compared with the system error performance under Gaussian channel.The simulation results show that the system error performance under weak turbulence channel conditions is not as good as the system error performance under Gaussian channel conditions, Under both channel conditions, the coding gain of 3 ~ 6 dB can be obtained by introducing Turbo code coding technology, which can effectively improve the error performance of the system and has good military application value.