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In this paper, an innovative low complexity triple layer Wireless Sensor Network (WSN) system is proposed, which monitors M-ary events like temperature, pressure, etc. with the help of geographically distributed local sensors. These local sensors convey signals to the fusion centre using M-ary Frequency Shift Keying (MFSK) modulation scheme over Rayleigh fading channels. At the fusion centre, non coherent detection based on square-law principles aided by Equal Gain Combining (EGC) takes place. With the help of various simulations, the performance and effectiveness of the system has been analyzed by varying probability of correct detection by the local sensors, modulation levels and number of local sensors. Our study endeavours to prove that MFSK WSN is a dependable system, which can achieve reliable results for the correct detection of M-ary events even over a dynamic channel and with undependable sensors.
Date of Conference: 3-5 Nov. 2011