由于水声信道复杂多变,很难进行信道建模,迄今为止并没有一个标准的统计信道模型。针对不同的研究对象,往往需要采用不同的水声信道模型,而评估信道建模差异对研究结论的影响则具有重要意义。从信道纠错码角度,在分析时不变信道模型、时变信道模型和准静止衰落信道模型的基础上,结合高效信道纠错码(以ldPC码为例),讨论了水声信道模型差异对研究纠错码性能可能带来的影响,为实际设计水声通信系统提供参考。仿真结果表明,尽管不同信道建模方式对系统解码的具体信噪比数值要求不大相同,但编译码参数优化设计的方案基本一致,海试数据则进一步验证了上述结论。There have been no standard statistical channel models for the underwater acoustic( UWA)channel as a result of the complex and variability of UWA channel.Different UWA channel models are required for different purposes during the UWA communication research.It is important to evaluate the effect of different UWA channel modeling on research conclusions.From the perspective of channel errorcorrection code,the effects of different channel models on channel error-correction code( taking LDPC codes as an example) design are investigated by analyzing several UWA channel models,including timeinvariance model,time-variance model and quasi-static fading model adopted in UWA communication simulation.The simulation results show that the optimized designs of coding parameters are almost the same,although different channel modeling usually requires different signal-to-noise ratio for decoding.The sea test data are adopted to further verify the conclusions.国家自然科学基金项目(41176032、41376040); 中央高校基本科研业务费专项基金; 厦门大学基础创新科研基金项目(201112G020、201212G012); 高等学校博士学科点专项科研基金项目(20130121120033
