[IEEE 2014 International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment and Management (HNICEM) - Palawan, Philippines (2014.11.12-2014.11.16)] 2014 International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment and Management (HNICEM) - Effect of varying the step-size of least mean squares filter in the accuracy of extraction of passive RFID root-music direction-of-arrival estimates