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IoT LoRaWAN Chipless RFID Reader based on SDR and Blind Detection Technique
2024 IEEE International Conference on Internet of Things and Intelligence Systems (IoTaIS)
Year: 2024 | Conference Paper |
Main objective of this paper is to introduce a novel and cost effective IoT Chipless RFID reader for long range applications based on Software Defined Radio (SDR) and enhanced blind detection technique. The proposed smart reader is connected to the The Things Network (TTN) cloud of Long Range Wide Area Network (LoRaWAN) devices. A LoRa backhaul is embedded in the GNU Radio program of the reader fo...Show More
Low-Latency Chipless RFID Tag Reader: Real-World Implementation of Frequency Hopping-Sweeping Blind Detection Technique
Mohamed El-Hadidy;Shahed I. Khan;Likitha Lasantha;Ines Bakri;Marc Tröge;Nemai C. Karmakar
The purpose of this paper is to develop a new, dependable and fast reader for chipless RFID tags using cost-effective Software Defined Radio (SDR) kits. The reader incorporates an innovative Frequency Hopping-Sweeping (FHS) blind detection algorithm that intelligently locates the positions of the pre-defined notches of the Radar Cross Section (RCS) of the Frequency Coded (FC) chipless tags. This n...Show More
Enhanced Chipless RFID Detection Algorithm for Dense Multipath Channels based on Calibration Equalization Techniques
2024 International Conference on Electromagnetics in Advanced Applications (ICEAA)
Year: 2024 | Conference Paper |
Main objective of this paper is to introduce an enhanced detection algorithm for Frequency Coded (FC) Chipless RFID tags within dense multipath channels based on Calibration Equalization Techniques (CET). In real-world multipath channels, few resolvable paths between the transmitter and the receiver of the reader are hitting the chipless RFID tag or the frequency selective surface, while many othe...Show More
Improved RCS Chipless RFID Tag Array for Long Reading Range
Mohamed El-Hadidy;Likitha Lasantha;Shahed I. Khan;Yasmine El Sayed;Nemai C. Karmakar
2023 33rd International Conference Radioelektronika (RADIOELEKTRONIKA)
Year: 2023 | Conference Paper |
Cited by: Papers (6)
This paper introduces a chipless RFID array configuration to improve the reading range of the tag by enhancing its Radar Cross Section (RCS). First, a four-bit unit cell tag is designed using multiple concentric Slot Ring Resonators (SRRs) with resonance frequencies at 1.4, 1.8, 2.4 and 5.2 GHz and thus enables binary tag identification coding using On-Off Keying (OOK). Then a 4×4 array tag is des...Show More
Realistic Chipless RFID Tag Modeling, Mathematical Framework and 3D EM Simulation
2019 IEEE International Conference on RFID Technology and Applications (RFID-TA)
Year: 2019 | Conference Paper |
Cited by: Papers (10)
Main objective of this work is to introduce a concrete modeling technique for chipless RFID tags based on 3D Bi-static Radar Cross Section (RCS) with the corresponding mathematical framework. This technique illustrates a systematic Electromagnetic (EM) simulation steps for fully presenting the 3D model of the chipless RFID tag in order to be integrated in the whole system as a part of the spatial ...Show More
Cost-Effective Testbed for Cognitive Long-Range Communications based on Antenna Array and Software Defined Radio
2019 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)
Year: 2019 | Conference Paper |
Cited by: Papers (1)
Main objective of this work is to design and implement a cost-effective testbed for cognitive long-range communication system based on a high gain planar antenna array and Software Defined Radio (SDR) kits. Antenna integration, miniaturization and feeding network optimization have been properly executed for designing a 4x4 linear antenna array in order to achieve a return loss of -25 dB and a dire...Show More
FSS based Hexo-Fractal Dual Passband Filter for 28 and 380Hz 5G Millimeter-Wave Communications
2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting
Year: 2018 | Conference Paper |
Cited by: Papers (8)
This paper presents a dual passband frequency selective surface for future 5G communications. The FSS has two ring slots with hexagonal shape, one of which has been applied with a fractal generator. The FSS unit cell is 3.7×3.7mm2. The pass band ranges are 27.639 - 28.997 GHz and 37.442 - 41.452 GHz, covering both 28 and 38 GHz 5G bands. The FSS has been modelled using very thin 0.127 mm flexible ...Show More
Reflectarray antenna for breast cancer detection and biomedical applications
2016 IEEE Middle East Conference on Antennas and Propagation (MECAP)
Year: 2016 | Conference Paper |
Cited by: Papers (2)
The main objective of this paper is to design a very directive reflectarray antenna (RA) for biomedical imaging applications and breast cancer detection. The RA consists of a horn antenna as a feeder and a reflection surface based on double ring (DR) unit cell that achieves 350° phase range at a resonant frequency of 2.2 GHz. The designed RA is a pencil beam antenna with a high directivity gain of...Show More
Antenna Selection for Reliable MIMO-OFDM Interference Alignment Systems: Measurement-Based Evaluation
Mohammed El-Absi;Savitri Galih;Marc Hoffmann;Mohamed El-Hadidy;Thomas Kaiser
Interference alignment (IA) is a promising transmission technology enabling, essentially, the maximum achievable degrees of freedom (DOF) in K-user multiple-input-multiple-output (MIMO) interference channels. The ideal DOF of IA systems have been obtained using independent MIMO channels, which is, usually rarely observed in reality, particularly in indoor environments. Therefore, the data sum rate...Show More
Design an adaptive electronically beamsteering reflectarray antenna for RFID systems
2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting
Year: 2015 | Conference Paper |
Cited by: Papers (4)
The main objective of this paper is to design an electronically scanning reflectarray antenna for the RFID system to precisely identify and locate the tags. The RA consists of a novel cell design utilizing a varactor diode to provide the phase shifts required to steer the beam in a certain direction. The cell used in the design is Split Slotted Dipole (SSD) that provide minimum re-radiation loss a...Show More
Terahertz band: Indoor ray-tracing channel model considering atmospheric attenuation
2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting
Year: 2015 | Conference Paper |
Cited by: Papers (12)
In this paper, we present first results of ray-tracing simulations of a realistic office environment across a wide spectrum from 100 GHz (0.1 THz) to 1000 GHz (1.0 THz). This ray-tracing model is used to study the channel characteristics and analyze the variation in received power and the channel delay profile. Furthermore, the frequency dependent atmospheric attenuation has been considered in thi...Show More
A novel co/cross-polarizing chipless RFID tags for high coding capacity and robust detection
Maher Khaliel;Ahmed El-Awamry;Abdelfattah Fawky;Mohamed El-Hadidy;Thomas Kaiser
2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting
Year: 2015 | Conference Paper |
Cited by: Papers (16)
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 introduce...Show More
A novel collision avoidance MAC protocol for multi-tag UWB chipless RFID systems based on Notch Position Modulation
Mohamed El-Hadidy;Ahmed El-Awamry;Abdelfattah Fawky;Maher Khaliel;Thomas Kaiser
2015 9th European Conference on Antennas and Propagation (EuCAP)
Year: 2015 | Conference Paper |
Cited by: Papers (3)
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 ...Show More
Printable depolarizing chipless RFID tag based on DGS resonators for suppressing the clutter effects
2015 9th European Conference on Antennas and Propagation (EuCAP)
Year: 2015 | Conference Paper |
Cited by: Papers (1)
In this paper, a novel Frequency Coded (FC) depolarizing chipless Radio Frequency Identification (RFID) tag is introduced. The uniplanar tag consists of L-shape Defected Ground Structure (DGS) resonators defining the tag signature and two orthogonally polarized Ultra Wideband (UWB) monopole antennas for realizing the cross-polarization retransmission process. Consequently, the polarization diversi...Show More
Smart notch detection techniques for robust frequency coded chipless RFID systems
Ahmed El-Awamry;Abdelfattah Fawky;Mohamed El-Hadidy;Thomas Kaiser
2015 9th European Conference on Antennas and Propagation (EuCAP)
Year: 2015 | Conference Paper |
Cited by: Papers (2)
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 orthonor...Show More
Novel Pseudo-Noise coded chipless RFID system for clutter removal and tag detection
Abdelfattah Fawky;Maher Khaliel;Ahmed El-Awamry;Mohamed El-Hadidy;Thomas Kaiser
2015 IEEE International Conference on RFID (RFID)
Year: 2015 | Conference Paper |
Cited by: Papers (18)
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 ta...Show More
Novel notch modulation algorithm for enhancing the chipless RFID tags coding capacity
Ahmed El-Awamry;Maher Khaliel;Abdelfattah Fawky;Mohamed El-Hadidy;Thomas Kaiser
2015 IEEE International Conference on RFID (RFID)
Year: 2015 | Conference Paper |
Cited by: Papers (38)
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 Sm...Show More
MISO beamforming for RFID systems via Second-Order Cone Programming
Betty Nagy;Abdelfattah Fawky;Maher Khaliel;Mohamed El-Hadidy;Thomas Kaiser
The 8th European Conference on Antennas and Propagation (EuCAP 2014)
Year: 2014 | Conference Paper |
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 weigh...Show More
UWB chipless RFID system performance based on real world 3D-deterministic channel model and ZF equalization
Abdelfattah Fawky;Maher Mohammed;Mohammed El-Hadidy;Thomas Kaiser
The 8th European Conference on Antennas and Propagation (EuCAP 2014)
Year: 2014 | Conference Paper |
Cited by: Papers (9)
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 mult...Show More
UWB Reflectarray Antenna for chipless RFID applications
2014 31st National Radio Science Conference (NRSC)
Year: 2014 | Conference Paper |
Cited by: Papers (14)
The main limitation of any chipless Radio Frequency Identification (RFID) system is the very short reading range. In this paper, we propose an Ultra Wideband (UWB) Reflectarray Antenna (RA) system with 2.2 GHz bandwidth centered at 6 GHz for the reader of chipless RFID applications. The proposed reader antenna system enhances reader sensitivity, reduces multipath effects, helps in tag localization...Show More
UWB antennas: Mathematical presentation, Impulse Response simulation and Electromagnetic modeling
2013 International Conference on High Performance Computing & Simulation (HPCS)
Year: 2013 | Conference Paper |
Cited by: Papers (1)
The main objective of this paper is to present the mathematical framework of the Ultra Wideband (UWB) antennas considering the directional gain, polarization, frequency dependence and matching. The detailed simulation procedures for obtaining the transmitting Antenna Impulse Responses (AIRs) either in frequency domain or in time domain using Electromagnetic (EM) simulation tool would be illustrate...Show More
Min-maxing interference alignment algorithm as a semidefinite programming problem
2013 IEEE 14th Workshop on Signal Processing Advances in Wireless Communications (SPAWC)
Year: 2013 | Conference Paper |
Cited by: Papers (2)
The main objective of this contribution is to develop a new interference alignment (IA) algorithm, which improves the sum-rate performance of multiuser MIMO communication systems. The recent iterative IA approaches cannot guarantee robust sum-rate performance in different K-user MIMO interference channels, especially at high SNR regime. In our proposed distributed optimization algorithm, each rece...Show More
Artificial diversity for UWB MB-OFDM Interference Alignment based on real-world channel models and antenna selection techniques
2012 IEEE International Conference on Ultra-Wideband
Year: 2012 | Conference Paper |
Cited by: Papers (3)
Main objective of this contribution is to apply Interference Alignment (IA) algorithms in real-world indoor environments for UWB MIMO MB-OFDM communication systems. In indoor environments, the required orthogonality between multi-users channels, which is necessary for proper IA, could be hardly reached. The spatial diversity among the users/nodes is mostly insufficient to obtain a robust performan...Show More
Realistic time reversal and spatial beamforming: An interference mitigation approach
Proceedings of the 5th European Conference on Antennas and Propagation (EUCAP)
Year: 2011 | Conference Paper |
In this paper a new time domain approach which combines time reversal (TR) and downlink spatial beamforming (BF) is proposed that can result in WB/UWB Interference Mitigation (IM). In order to design the TR filter and the desired beams, the Channel State Information (CSI) between the UWB system and the other wideband (WB) victim users is required. This information is obtained using a hybrid Electr...Show More
Influence of the real UWB antennas on the AoA estimation based on the TDoA localization technique
Waldemar Gerok;Mohamed El-Hadidy;Sondos Alaa El Din;Thomas Kaiser
IEEE Middle East Conference on Antennas and Propagation (MECAP 2010)
Year: 2010 | Conference Paper |
Cited by: Papers (12)
Main contribution of this paper is to present the influence of the real ultra-wideband directional antennas on the Angle of Arrival estimation. Furthermore, is to mitigate this undesired impact of the ultra-wideband antennas to improve the overall system performance and enhance the Angle of Arrival estimation accuracy. In the first step we analyze the estimation error due to the antenna induced de...Show More
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