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This paper presents a novel frequency coded chipless RFID tag, which exploits the backscattered co-polarized and cross-polarized responses from a tag illuminated with a linear polarized wave. Consequently, the tag-ID is configured in two orthogonal planes. The frequency notches are encoded in the co-polarization plane and the re-radiation peaks are encoded in the cross-polarization plane. Therefore,...
This work presents two completely printable chipless RFID tags for low-cost item labeling. The first developed tag is based on circular ring resonators where each resonator codifies a tag coding notch position. Therefore, the tag structure is scalable, printable and compact size. Moreover, a novel encoding methodology is employed to preserve the notch width and position while coding. The second developed...
Notch identification is a major challenge in Frequency Coded (FC) chipless RFID. The main objective of this contribution is to introduce three signal processing techniques for notch identification and detection. The three algorithms are Matched Filter(MF), Window Based- Singular Value Decomposition (WB-SVD) and Dynamic Time Warping (DTW). The algorithms should be able to detect both notch bandwidth...
The main objective of this contribution is to introduce a novel technique for reducing the time taken from the reader to identify the Frequency Coded (FC) chipless RFID tags existed in the reader's interrogation region, system latency. The frequency scanning methodology, number of averaging for clutter removal and hop duration are the three main parameters that significantly affect the overall system...
This work proposes the utilization of the Reflect Array (RA) antenna in the reader of the Frequency Coded (FC) chipless RFID systems aiming at increasing the reading range, minimizing the environmental reflections and acquiring a lot of novel capabilities that can not be provided by the conventional antenna systems. The FC chipless RFID system requires an UWB range of frequencies to accommodate multiple...
The main objective of this contribution is to introduce a novel multi-tag anti-collision protocol based on Look-Up-Table (LUT) scheme. The proposed protocol includes an enhancement for the spectrum utilization and coding capacity. This is accomplished by transferring the tag-ID to be stored in a table in the main memory of the reader (look-up-table). Moreover, the unique signature of each tag represents...
In this paper a frequency coded chipless RFID localization algorithm is proposed. Unlike other techniques, one reader with multiple antennas is used to interrogate, identify and localize the tag. The Received Signal Strength (RSS) technique is used to detect the range of the tag, while Matrix Pencil Method (MPM) is used to calculate the Angle of Arrival (AoA). To validate both techniques a ray tracing...
Main objective of this contribution is to introduce a novel collision avoidance protocol for the chipless Radio Frequency Identification (RFID) systems. The chipless RFID tags are dummy, memoryless, with limited number of bits, very low backscattered power and short reading range. Therefore, the existing RFID standards and protocols designed for the chipped RFID systems are not applicable for the...
The main objective of this work is to introduce two adaptive window-based notch detection techniques for Ultra Wideband (UWB) Frequency Coded (FC) chipless RFID system. The first proposed algorithm is the Window Based Singular Value Decomposition (WB-SVD), where various frequency dependent patterns of the notch are used as a training sequence for predefined bandwidth (window) to create an orthonormal...
The main contribution of this work is to introduce a novel technique for reducing the latency of multi-tag Frequency Coded (FC) chipless RFID systems, which is defined as the time required for the reader to identify the tagged objects within the same interrogation zone. The frequency scanning methodology, windowing and notch detection are the three main processing blocks that significantly affect...
The aim of this work is to introduce a novel tag design enhancing the coding efficiency for the Frequency Coded (FC) chipless RFID system. The proposed approach relies on exploiting the backscattered co/cross-polarized signals from a tag excited with a linear-polarized wave. Consequently, the tag signature is encoded into Notch/Peak (N/P) format in two orthogonal planes. Furthermore, the introduced...
In this contribution a novel Frequency Coded (FC) chipless RFID system is introduced to significantly enhance the tag detection. The proposed system exploits the properties of Pseudo Noise (PN) random sequence, as a transmitted signal, to accurately estimate the Channel Impulse Response (CIR). Consequently, the undesired environmental clutter is filtered by a Selective-RAKE receiver. Hence, the tag...
The main objective of this contribution is to introduce a novel technique for increasing the coding capacity of the Frequency Coded (FC) chipless RFID system. The proposed scheme encodes 4 bits per single resonator exploiting the notch bandwidth and its corresponding frequency position. Hence, 72-bits could be achieved from 2 to 5 GHz preserving the operating frequency bandwidth. Furthermore, a Smart...
In this paper a 3D-deterministic channel model for UWB chipless RFID system is presented. The tag in this work will be modeled as a 3D object, with frequency dependent Radar Cross Section (RCS), embedded in the channel which has several incident and reflected multipath at various directions both from the reader-tag and the reader-reader environment effect. In this model all channel effects as multipath...
This paper presents a beamforming design for Multiple-Input Single-Output (MISO) Radio Frequency Identification (RFID) systems. The design insures good Quality of Service (QoS) as well as optimal total power transmitted by the reader. Furthermore, a solution using Second-Order Cone Programming (SOCP) for the RFID beamforming problem is proposed. This SOCP algorithm yields optimal beamforming weights...
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