基于多方向天线阵列的链路质量评估技术  

Link Quality Evaluation Technology Based on the Direction of Antenna Array

作　　者：焦蓉[1] 苑海涛[1] 刘经纬[1] 

机构地区：[1]华北计算技术研究所,北京100083

出　　处：《计算机系统应用》2014年第4期17-22,28,共7页Computer Systems & Applications

摘　　要：提出了一种应用在基于多方向天线阵列的无线Mesh网络上的链路质量评估技术,该技术包括初始链路质量评估和持续链路质量评估.初始链路质量评估技术可以使新节点在入网阶段根据多天线阵列物理层探测到RSSI值、计算RSSI均值、建立RSSI矩阵,根据RSSI矩阵元素各值分布情况选定信道质量好的链路进行建链.持续链路质量评估技术则持续监测RSSI值的变化趋势或持续根据所选信道上统计的数据分组差错率估计并调整下一阶段发送数据时应选择的调制速率.实验结果表明,通过上述两种链路质量评估技术在基于多方向天线阵列的无线Mesh网络上的综合运用,网络节点能够实时感知各条链路上的质量变化并调整到最佳调制速率,保证了网络所持续提供的带宽能力,多天线阵列的空时分优势得以实际发挥.This paper puts forword a link quality evaluation technology based on the direction of antenna array. Link quality evaluation technology includes the initial link quality evaluation and continuous link quality evaluation. In the stage of a new node joining the net, initial link quality evaluation detects the RSSI value of the physical based on wireless Mesh network antenna array, and calculates the average RSSI, builds RSSI matrix. Then adopts a good quality channel according to the RSSI matrix values to build the link. Continuous link quality evaluation can monitor the change trend of RSSI continually, evaluates and adjusts the link modulation rate according to the packet error rate of the selected channel. The experiment results indicates that the initial link quality evaluation and continuous link quality evaluation can apperceive the change of all link quality, and adjust to the suitable modulation rate. Link quality evaluation technology can raise the utilization ratio of the bandwidth of the wireless network within a certain scope.

关 键 词：信号强度指示 分组差错率 调制速率 

分 类 号：TN820.15[电子电信—信息与通信工程]