Fuzzy based Estimation of Received Signal Strength in a Wireless Sensor Network
M. Meenalochani, S. V. Sudha · 2015
The main challenge faced by any Wireless Sensor Network is the network reliability. Received Signal Strength Indicator is a parameter which plays a major role in addressing this issue. Received Signal Strength Indicator can be obtained from the transceiver which is an indicative measure of the quality of the link established by a Wireless Sensor Network. It depends on many factors including the distance between the nodes, atmospheric variations, interference from other signal sources and transmission power. Motes designed by the manufacturers provide a built in code that displays this. However, these motes are costly and are specific to an application. So, if sensor nodes are to be designed for some specific applications, then measurement of Received Signal Strength becomes questionable. Hence, an attempt is made to estimate this through a Fuzzy Logic Controller. The proposed Received Signal Strength evaluation is based on the distance between the nodes, temperature, humidity and the transmitted power. The proposed Fuzzy logic estimator is implemented in MATLAB. To show the effectiveness of this approach, experiments are conducted in real environment using motes and the Received Signal Strength values perceived by these motes are compared with the simulated results. The results confirm the efficiency of the proposal and also ascertain the flexibity and usage of this technique in the sensor node design.