基于NS2的无线地下传感器网络信道模型的扩展与实现

Extension and Implementation of Channel Model for NS2-based WUSN

无线地下传感器网络作为一个全新的研究领域,它的大多数研究还在理论阶段。建立一个更接近真实地下环境的仿真平台,可以减少部署实验所耗费的资源。本文以现有的双径模型叠加多径瑞利衰落的地下信道模型为基础,建立考虑电磁传播信号所有成分的地下信道模型,同时增加地下-地上信道模型以及地上-地下信道模型,在NS2上进行仿真实现。在实现的平台上进行仿真,分析了吞吐率和丢包率这2个性能指标在不同通信距离的变化规律。仿真结果表明,所采用的模型能很好地反映地下通信情况,验证了模型用于地下环境仿真的可行性,为无线地下网络的学习和研究提供了参考及工具。

As a new research fieht, most of wireless underground sensor network research is still in theory stage. To establish a simulation platform closer to the real underground environment can reduce the cost of deployment experiments. Based on the twopath model and muhipath fading effects, we set up the underground channel model which considers all the ingredients of electro- magnetic transmission signal, at the same time, adds the underground-aboveground channel model and the aboveground-underground channel model, and is simulated on NS2. Through the simulation on the platform, this paper analyzes two peffurmance indexes in different commuiaication distance： the throughput and the packet loss rate. The results show that the model can be used to reflect the underground communication well, verify the feasibility of model used in underground environment simulation. The model can be used as reference and tools for future wireless underground network study and research.