基于SOD的无线传感器信号采样策略

Signal sample strategy based on send-on-delta for wireless sensor network

针对无线传感器网络带宽约束与能量限制问题,提出了基于SOD(Send-On-Delta)的信号采样策略,以输出信息的重要程度作为信息发送依据,解决了非重要信息对网络资源的占用问题,合理利用了网络带宽资源。在此基础上,分析了在该策略下系统的带宽需求,给出了数据平均产生率的上、下界,并在相同分辨率条件下,与周期采样策略进行了效力值比较,验证了该策略的有效性。最后仿真算例表明该策略对于节约带宽效果显著。

In view of the bandwidth constraints and energy restriction of Wireless Sensor Network （WSN）, the SOD （Send-On-Delta） signal sampling strategy was proposed, under which the data was transmitted based on the importance of the system output. The problem of network resource occupied by the unimportant information was solved; therefore the network bandwidth resource was used rationally. Based on this, the system bandwidth requirements were analyzed. The upper and lower boundaries on the average generation rate of messages were given. Furthermore, under the same resolution condition, the SOD effectiveness in comparison to the periodic sampling was evaluated. Finally, simulation results demonstrat that the strategy is obviously valid in saving bandwidth.