University of Twente Student Theses


DOA Estimation of UHF RFID Tags in Multipath Environments

Tjhin, Yoppy (2014) DOA Estimation of UHF RFID Tags in Multipath Environments.

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Abstract:Inventory management is a crucial aspect in retail businesses. The idea is to keep tracking the stock quantity as well as the location of each item whether it is in the front shop or in the store room. By maintaining the stock availability, opportunity loss can be prevented. To achieve high efficiency, it is desirable to have a system that can automatically read the identification number as well as the direction of movement of each item while it is being relocated, for example from the store room to the front shop, and vice versa. In order to be able to detect both directions at the same time, a new method using a phased array was proposed. A six-element linear phased array has been implemented. Measurements in reflection-minimum environments showed that the direction of arrival (DOA) estimations were good and consistent. However measurements in reflective environments, comparable to retail shops, showed deteriorated results. Such worsening results were most likely caused by the presence of multipath signals. While showing a promising simulation result in solving multipath signals, the forward/backward spatial smoothing (FBSS) algorithm was unfortunately not able to improve the real measurement in the reflective environments. This is probably because the number of antennas is insufficient and the multipath signals are too closely spaced.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:53 electrotechnology
Programme:Embedded Systems MSc (60331)
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