基于信道信息统计的WLAN速率自适应算法

A WLAN Rate Adaptive Algorithm Based on Channel Information Statistics

随着802.11协议簇的新标准越来越多,调制编码方式也越来越多,速率越来越高。在不同的信道条件下,针对如何快速准确地获取发送速率来提高系统在不同条件下的适应能力,提出了一个新型实用基于信道信息统计的速率适应(RA)算法,称为ISRA。发送方在发送状态和探测状态来回切换,在信道条件不停地变化中根据探测速率的表现及时找到合适的发送速率,提供给发送状态使用。构建了一个用于探测时使用的二维速率探测表,在探测时,根据传输统计的更新决定探测的方向。在实际的硬件设备中实现了该算法,并将实验所获得的数据与现有的速率控制机制进行比较。实验证明此方案的信道适应能力明显优于内核默认的minstrel速率适应算法。

With new standards of 802.11 protocol cluster get more and more,the modulation and coding modes are becoming more and more,and the rate higher and higher.Under different channel conditions,a new practical rate-adaptive（RA） algorithm based on channel information statistics,which is called ISRA,is proposed to obtain the transmission rate continuously and accurately to improve the adaptability of the system under different conditions.The sender switches between transmission state and detection state,and when the channel condition is constantly changing,the appropriate transmission rate is found according to the performance of the detection rate,and is provided for use under transmission state.A two-dimensional rate detection list is used for probing,and the detection direction is determined according to the update of the transmission statistics.The algorithm is implemented in actual hardware device,and the data obtained by the experiment is compared with the existing rate control mechanism.Experiments show that this scheme is superior to the kernel＇s default minstrel rate adaptation algorithm in channel adaptability.