高密度WLAN环境下动态频率选择算法的研究

提出了一种新的动态频率选择算法,该算法基于DCF机制,不改变原有IEEE 802.11b的MAC层协议。算法定义了一个信道质量参数用来评估自身干扰情况,通过周期性的检测信道状态,自适应的优化算法参数,动态分配频率资源,在现有的信道资源下提升系统容量。给出了算法处理过程的描述以及相关参数,并以IEEE 802.11b系统为例进行了仿真。仿真结果表明:该算法能够实现在高密度、负载不均衡的无线局域网环境下大大提高整个系统的吞吐量。

Research on DFS Algorithm in a Dense WLAN Environment

In this paper, a new Dynamic Frequency Selection (DFS) algorithm is introduced in detail based on Distributed Coordination Function (DCF) mechanism. The DFS algorithm has defined a parameter of channel quality assessment. According to the condition of channel interference, DFS can optimize parameters and assign frequency recourses dynamically, and therefore improve the system capacity adaptively. The paper gives the disposition processing and parameters. Simulation results show that DFS can improve total throughput in a dense and non-uniform load WLAN system.