IJRCS – Volume 6 Issue 1 Paper 1


Author’s Name : A.S.K. Ano Nerula Suni | T.C.Subbulakshmi

Volume 06 Issue 01  Year 2019  ISSN No:  2349-3828  Page no:  1-6



This Project titled “motion tracking device with wifi power measurements” facilitates to count the total number of people walking in an area based on only WiFi received signal strength indicator (RSSI) measurements between a pair of stationary transmitter/receiver antennas. This work proposes a framework based on understanding two important ways that people leave their signature on the transmitted signal: blocking the Line of Sight (LOS) and scattering effects. By developing a simple motion model, this work first mathematically characterizes the impact of the crowd on blocking the LOS. This work probabilistically characterizes the impact of the total number of people on the scattering effects and the resulting multipath fading component. By putting the two components together, developing a mathematical expression for the probability distribution of the received signal amplitude as a function of the total number of occupants, which will be the base for our estimation using Kullback-Leibler divergence. In order to confirm the proposed framework, extensive indoor and outdoor experiments were conducted with up to 9 people and show that the proposed framework can estimate the total number of people with a good accuracy with only a pair of WiFi cards and the corresponding RSSI measurements.



Wifi power, multipath fading components, Amplitude framework


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