NS-2中的无线噪声干扰模型拓展

NS-2 Extension for Wireless Noise Interference Model

在无线网络协议的仿真中很有必要考虑噪声和干扰的影响,然而广泛使用的网络模拟器NS-2对其模拟功能较弱,为此针对NS-2提出了一种无线噪声干扰模型(WNIM)。该模型分别对干扰和噪声建模,噪声模型引入缓存队列机制近似估算信号总能量,并借鉴MATLAB的AWGN函数方法模拟噪声;干扰模型虚拟一定距离远处的干扰源发射无线电波,通过设定不同M值模拟不同类型的干扰。两方法均动态地调整节点网络接口层的接收阈值,以模拟噪声和干扰引起的额外丢包。仿真结果表明,WNIM增强了NS-2的噪声和干扰模拟功能且具有较高的模拟精度,能为无线网络协议的研究提供仿真基础。

The influence of noise and interferences must be taken into consideration in the protocol simulation for wireless networks, but the widely used Network Simulator 2（NS-2） shows little support on the implementation of them. Therefore, a wireless noise interference model（WNIM） for NS-2 was proposed. It modeled interferences and noise respectively. The noise model introduced a buffer queue mechanism to estimate signal total energy, and then imitated noise by adopting the method in function AWGN of MATLAB. On the other hand, the interference model made up interference sources from some distance away to emit radio, and then simulated different types of interferences by setting different value M. These two methods dynamically adjusted the threshold in mobile node to simulate extra packet loss that noise and interferences caused. Simulated results show that WNIM has enhanced the function of simulating noise and interferences in NS-2 with well accuracy, and it can provide simulation basis in the research of wireless network protocols.