— Radio frequency identification (RFID) is a wireless technology that uses radio backscatter signals to purpose of identify objects. Especially, in the microwave frequency as 2.45 GHz is growing rapidly. Since the physical environment surrounding the propagation path of radio identification is generally difficult to control, the channel characteristics in backscattering are often channel fading. There are two major sources of impairment of the RFID reader is unreadable as the tag signal propagate through channel. Some works provides to use the multiple antennas for both transmit and receive of RFID readers. In this paper, we propose a perspective of blind channel estimation is presented to the RFID reader receiver for multiuser detection. Furthermore, the multiple-input and multiple-output (MIMO) of channel measurement is verified with the multiple antennas at the RFID reader and provides the multiple tags are under test. We also propose a linear receiver to estimate the received signal, where provides a zero-forcing (ZF) and a minimal mean square error (MMSE) in order to estimate the channel state information (CSI) at the reader receiver. Under the signal estimation, we shown the blind order signal estimated so that the reader can adapt as the multiple tag and available the detection simultaneously.
— RFID reader receiver, MIMO, blind signal estimation, multiuser detection.
S. Duangsuwan is with the Electrical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Lakrabang, Bangkok, Thailand 10520 (e-mail: email@example.com).
S. Promwong is with the Department of Telecommunication Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Lakrabang, Bangkok, Thailand 10520 (e-mail: firstname.lastname@example.org).
Cite: Sarun Duangsuwan and Sathaporn Promwong, " RFID Reader Receiver Using Blind Signal Estimation for Multiuser Detection," International Journal of Information and Electronics Engineering vol. 4, no. 2, pp. 153-157, 2014.