Article
Engineering, Electrical & Electronic
Sarthak Nijhawan, Agrim Gupta, Kumar Appaiah, Rahul Vaze, Nikhil Karamchandani
Summary: The paper discusses the impact of using channel state information (CSI) on the performance of wireless communication systems, addressing the burden of CSI feedback in links employing multiple-input multiple-output (MIMO) and orthogonal frequency division multiplexing (OFDM). It proposes efficient methods for quantization and interpolation on Flag manifolds, which effectively enhance achievable rates with limited complexity.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Muhammad Sajid Sarwar, Muneeb Ahmad, Soo Young Shin
Summary: This work proposes a spectral efficient frequency division multiplexing with subcarrier index modulation (SEFDM-SIM) method for multi-input multi-output (MIMO) wireless networks. SEFDM employs non-orthogonal frequency division multiplexing to enhance the spectral efficiency (SE) but with increased inter-carrier interference compared to traditional orthogonal frequency division multiplexing (OFDM). In SEFDM-SIM, information is conveyed not only by M-ary signal constellations but also by the indices of the subcarriers. Both analytic and simulation results demonstrate that the proposed MIMO-SEFDM-SIM outperforms conventional MIMO-OFDM and MIMO-OFDM-SIM in SE, while achieving improved bit error rate (BER) compared to MIMO-OFDM and MIMO-SEFDM systems.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Yibin Wan, Bo Liu, Jianxin Ren, Rahat Ullah, Yaya Mao, Suiyao Zhu, Shuaidong Chen, Xiangyu Wu, Feng Wang, Tingting Sun, Yongfeng Wu, Lilong Zhao
Summary: This paper proposes a novel optical non-orthogonal multiple access (NOMA) scheme based on orthogonal chirp division multiplexing (OCDM) for low-cost passive optical network (PON) systems. The proposed scheme improves spectral efficiency and serves more users by multiplexing spectrally overlaid OCDM signals in power domain. Experimental results show that OCDM-NOMA with higher-order modulation can be a promising candidate for next-generation PONs.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Geochemistry & Geophysics
Biao Xue, Gong Zhang, Qijun Dai, Zheng Fang, Henry Leung
Summary: The importance of orthogonal waveform diversity design and efficient hardware implementation in miniature MIMO radars is discussed in this article. The OFDM chirp waveform is analyzed for dechirp processing in MIMO radar, and different configurations of chirp rates within and between transmitted waveforms are investigated. A novel dechirp-based OFDM chirp waveform diversity design method is proposed and its effectiveness is verified through numerical results and experiments.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Geochemistry & Geophysics
Guodong Jin, Yunkai Deng, Wei Wang, Yongwei Zhang, Da Liang, Robert Wang
Summary: In this letter, a novel MIMO-SAR imaging scheme based on the improved orthogonal frequency-division multiplexing (OFDM) waveforms is proposed to address the challenging echo separation issue of different transmit antennas. The scheme employs a simple time-shift weighting process and a bandpass filter bank to separate the echoes from close arrival angles, and digital beamforming (DBF) on receive is employed to separate the echoes from far arrival angles. Distributed scene simulation results are presented to verify the practicability of the proposed scheme.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2021)
Article
Geochemistry & Geophysics
Yongwei Zhang, Wei Wang, YunKai Deng, Robert Wang, Guodong Jin, Yashi Zhou, Yajun Long
Summary: A novel and low-cost echo separation technique for MIMO synthetic aperture radar (SAR) based on OFDM chirp waveforms is proposed, allowing the generation of multiple waveforms on common spectral support. Simple time-domain operations are applied to eliminate interference, and a combination of bandpass filter and digital beamforming enables interference suppression in a spaceborne SAR scenario. Distributed scene simulation results validate the practicability of the proposed scheme.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2021)
Article
Telecommunications
Chi-Min Li, Yi-Ru Li
Summary: This paper discusses the use of OFDM and MIMO schemes in the current 4G LTE system to enhance system performance. It also proposes two precoding matrix selection methods, one with low computational complexity and the other with zero latency property compared to conventional full search methods.
WIRELESS PERSONAL COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
David A. Schneider, Markus Roesch, Axel Tessmann, Thomas Zwick
Summary: This study presents a multichannel imaging radar that achieves uniform 2-D cross-range resolution using a linear array of leaky-wave antennas, enabling a tradeoff between range resolution and the number of channels required for a given angular resolution. By combining W-band RF components with the presented aperture, a high 3-D resolution is achieved using only eight transmitters and receivers.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Engineering, Electrical & Electronic
Hanqing Wang, Nir Shlezinger, Yonina C. Eldar, Shi Jin, Mohammadreza F. Imani, Insang Yoo, David R. Smith
Summary: This study investigates the application of dynamic metasurface antennas (DMAs) for MIMO-OFDM receivers and proposes methods to optimize DMA parameters in the presence of bit-constrained analog-to-digital converters (ADCs). The results demonstrate that notable performance gains can be achieved by exploiting the spectral diversity of DMAs.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Chang Hyun Park, Seong-Woo Woo, Nayoung Kim, Hansol Jang, Hyung-Hoi Kim, Yeong Jin Kim, Young-Min Lee, Keum-Shik Hong, Chang-Seok Kim
Summary: This study presents a four-color functional near-infrared spectroscopy (fNIRS) system using frequency division multiplexing (FDM) to simultaneously discriminate multiple chromophores. The system achieves a higher sampling rate compared to the conventional time division multiplexing (TDM) method. Experimental results show a high correlation between the developed fNIRS system and a commercial spectrometer, validating its performance. In vivo discrimination of three chromophores and the successful acquisition of brain signals further demonstrate the effectiveness of the FDM-based fNIRS system.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Computer Science, Information Systems
Junseuk Suh, Jungah Lee, Gye-Tae Gil, Songcheol Hong
Summary: A time-and-frequency hybrid multiplexing technique for a MIMO OFDM radar is proposed using DFT-coded waveforms to address range and Doppler ambiguity issues. The hybrid approach combines both domain multiplexing techniques to mitigate limitations. Range and Doppler maps are simulated with different hybrid multiplexing ratios to demonstrate the effectiveness of the technique.
Article
Engineering, Electrical & Electronic
Yahya M. Al-Moliki, Mohammed T. Alresheedi, Ahmad Fauzi Abas, Mohd A. Mahdi, Ng Eng Khoon
Summary: This paper presents two optical OFDM-based MIMO schemes for visible light communications, which utilize general-numbered MIMO configurations of LEDs. The schemes exhibit reduced complexity and provide enhanced spectral efficiency. Simulation results show that selecting the optimal MIMO configuration is crucial for achieving desired BER performance and SE requirements.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Jinyong Kim, Carly Fengel, Siyuan Yu, Ethan D. Minot, Matthew L. Johnston
Summary: The research proposes a method to break the traditional N-wire, N-electrode array architecture using graphene active electrodes and frequency-division multiplexing. This approach can increase signal count, spatial resolution, and temporal precision while decreasing access wires.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2021)
Article
Engineering, Electrical & Electronic
Lifeng Mai, Xiazhi Lai, Qi Zhang, Jiayin Qin
Summary: In this study, we investigate the problem of maximizing the total information freshness in an uplink orthogonal frequency division multiplexing (OFDM) based multiple access network. We propose an alternating optimization algorithm to solve the problem and demonstrate that our scheme outperforms other updating schemes.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Sung Hyuck Hong, Jaeyong Park, Sung-Jin Kim, Junil Choi
Summary: This paper studies the IRS-aided mmWave MIMO systems with hybrid beamforming architectures and proposes joint designs for narrowband and broadband scenarios. Simulation results show that the proposed designs can significantly enhance the spectral efficiency of the systems.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Laura Van Messem, Arno Moerman, Olivier Caytan, Igor Lima de Paula, Bram Hoflack, Bram Stroobandt, Sam Lemey, Marc Moeneclaey, Hendrik Rogier
Summary: This article presents a novel 4 Chi 4 Butler matrix integrated with a highly efficient and broadband 1 Chi 4 cavity-backed patch antenna array, providing a wide operational frequency range for the fifth-generation (5G) bands. The optimized Butler matrix exhibits low insertion loss, small amplitude imbalance, and high isolation between input ports.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Agriculture, Dairy & Animal Science
S. Benaissa, D. Plets, L. Vandaele, W. Joseph, B. Sonck, F. A. M. Tuyttens, L. Martens
Summary: The study aims to present an efficient method to improve cattle behavior monitoring systems by incorporating Ultra-Wideband (UWB) indoor location and accelerometer data.
Article
Engineering, Electrical & Electronic
Hanne Herssens, Wout Joseph, Arno Thielens
Summary: This manuscript presents a survey of the existing literature on on-body antenna arrays, which are used for wireless communication in WBAN and medical applications. The design process, required characteristics, and different types of on-body antenna arrays are discussed. The gain normalized to the area for the antenna arrays is compared, and important lessons for future development are drawn from the literature review.
IEEE ANTENNAS AND PROPAGATION MAGAZINE
(2023)
Article
Engineering, Electrical & Electronic
Brecht De Beelde, David Plets, Wout Joseph
Summary: This letter presents vegetation loss measurements at V-band frequencies ranging from 50 to 75 GHz using a spectrum analyzer-based channel sounder. The measured vegetation loss is used to validate existing vegetation models, and the influence of vegetation on network performance is evaluated using IEEE 802.11ad transceivers.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Chemistry, Analytical
Kenneth Deprez, Loek Colussi, Erdal Korkmaz, Sam Aerts, Derek Land, Stephan Littel, Leen Verloock, David Plets, Wout Joseph, John Bolte
Summary: This paper compares different low-cost sensors that can measure (5G) RF-EMF exposure, including commercially available ones and those constructed by research institutions. In-lab and in-situ measurements were conducted to test the linearity, sensitivity, and assess the RF-EMF radiation. The results showed that these low-cost sensors and SDR can provide temporal and spatial 5G electromagnetic field values for the general public and governments.
Article
Chemistry, Analytical
Brecht De Beelde, Mike Vantorre, German Castellanos, Mario Pickavet, Wout Joseph
Summary: The large bandwidths available at millimeter-wave frequencies enable fixed wireless access (FWA) applications. In FWA networks, data are routed from customer premises equipment (CPE) to point of presence (POP) through wireless links. This study analyzes FWA networks using radio propagation models for different wireless technologies at millimeter-wave frequencies. The impact of rain, vegetation, and the number of subscribers on network performance is investigated. A network planning algorithm is presented based on customer device location and available capacity of wireless links. Rain has minimal effect on system capacity. Higher frequencies result in lower power of received signal, but larger bandwidths enable higher channel capacity.
Article
Chemistry, Analytical
Alessandro Felaco, Kamil Yavuz Kapusuz, Hendrik Rogier, Dries Vande Ginste
Summary: For ultra-reliable high-data-rate communication in B5G and 6G wireless networks, beamforming plays a crucial role, especially with mobile users located in the radiative near-field of large antenna systems. A novel approach that shapes the electric near-field of any general antenna array topology by controlling the amplitude and phase is presented. The proposed method utilizes Fourier analysis and spherical mode expansions to exploit the beam synthesis capabilities of the array, demonstrating full control of radiation in all directions and achieving optimal performance in focal zones.
Article
Multidisciplinary Sciences
Jelle Jocque, Jo Verhaevert, Patrick Van Torre, Hendrik Rogier
Summary: Textile antenna systems and platforms play a crucial role in smart fabric interactive textile (SFIT) systems, requiring energy-efficient, low-profile designs with stable wireless body-centric communication links. This study proposes a wearable coupled-quarter-mode (coupled-QM) substrate-integrated waveguide (SIW) antenna with seamlessly integrated hybrid kinetic and ambient-light energy harvesters. The antenna platform, made of protective rubber foam and copper taffeta, can be seamlessly integrated into protective clothing. Experimental results demonstrate that the integrated antenna platform achieves a wide impedance bandwidth, high radiation efficiency, and maximum gain. Moreover, it can harvest a significant amount of power when worn around a person's wrist in an illuminated room.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Electrical & Electronic
Said Benaissa, Denys Nikolayev, Gunter Vermeeren, Kenneth Deprez, Jasper Goethals, Bart Sonck, Frank A. M. Tuyttens, Luc Martens, David Plets, Wout Joseph
Summary: This study designed and validated a novel multiband (434, 868, and 1400)-MHz conformal patch antenna for in-body biotelemetry applications for cows. The optimal frequency band was determined based on dielectric measurements of the antenna environment. The antenna showed high performance with realized gain and radiation efficiency at different frequencies.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Sergei Shikhantsov, Arno Thielens, Gunter Vermeeren, Piet Demeester, Luc Martens, Wout Joseph
Summary: This article compares the effects of collocated and distributed massive MIMO deployments on downlink human exposure to electromagnetic fields (EMF) in an industrial indoor environment at 3.5 GHz. Environmental models with stochastic geometry are used to simulate EMF propagation, while the finite-difference time-domain method evaluates human exposure. Different scenarios are considered, and the results show that the distributed deployment leads to a more accurate and consistent EMF hot-spot around the user equipment, with higher average E-field gain. It also results in more compact hot-spots and a significant reduction in average exposure in multiuser scenarios.
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Kamil Yavuz Kapusuz, Sam Lemey, Hendrik Rogier
Summary: This article introduces a new single-feed ultrawideband cavity-backed slot antenna with multipolarization reconfiguration. By creating two concentric annular slots on the top of the circular cavity and shorting them at specific positions using four groups of PIN diodes, dynamic polarization reconfiguration is achieved. Experimental results show that the antenna has an impedance bandwidth of 1.6 GHz (or 29%), total efficiency higher than 74%, and a gain higher than 5.2 dBi in free-space conditions.
2023 17TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION, EUCAP
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Olivier Caytan, Igor Lima de Paula, Laurens Bogaert, Joris Van Kerrebrouck, Arno Moerman, Mohammad Muneeb, Guy Torfs, Johan Bauwelinck, Piet Demeester, Gunther Roelkens, Sam Lemey, Hendrik Rogier
Summary: This contribution discusses recently proposed remote antenna units (RAUs) based on air-filled substrate-integrated-waveguide technology, emphasizing the co-design between antenna elements and optoelectronic transducers. Results showed that the performance of the RAU benefits from a thorough co-design, achieving a conjugate-match between components, compared to optimizing each component separately. The sub-6 GHz RAU underwent significant miniaturization, while the mmWave RAU achieved improved efficiency.
2023 17TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION, EUCAP
(2023)
Proceedings Paper
Computer Science, Hardware & Architecture
Martijn Huynen, Ruben Waeytens, Dries Bosman, Michiel Gossye, Hendrik Rogier, Dries Vande Ginste
Summary: In this paper, the propagation constant of interconnects subject to line edge roughness is studied using an efficient stochastic framework. The number of calls to the full-wave electromagnetic field solver is limited by employing the stochastic testing method. The computation of the eigenvalue problem is eased by reducing its order through projection on an appropriate basis. The novel framework is applied to a rough rectangular waveguide and a microstrip.
2023 IEEE 27TH WORKSHOP ON SIGNAL AND POWER INTEGRITY, SPI
(2023)
Article
Engineering, Electrical & Electronic
Arno Moerman, Olivier Caytan, Laura Van Messem, Joris Van Kerrebrouck, Guy Torfs, Piet Demeester, Hendrik Rogier, Sam Lemey
Summary: This article proposes a dedicated simulation suite that accurately predicts system-level performance and enables time-efficient optimization of hardware configuration for mmWave-over-fiber-based distributed antenna systems (DASs). The suite incorporates accurate models for the mmWave-over-fiber link, amplifiers, antenna front-ends, and wireless channels. It is validated through a measurement campaign, accurately predicting uplink and downlink quality, considering inter-user interference.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Engineering, Electrical & Electronic
Mahmoud Wagih, Leonardo Balocchi, Francesca Benassi, Nuno B. Carvalho, Jung-Chih Chiao, Ricardo Correia, Alessandra Costanzo, Yepu Cui, Dimitra Georgiadou, Carolina Gouveia, Jasmin Grosinger, John S. Ho, Kexin Hu, Abiodun Komolafe, Sam Lemey, Caroline Loss, Gaetano Marrocco, Paul Mitcheson, Valentina Palazzi, Nicoletta Panunzio, Giacomo Paolini, Pedro Pinho, Josef Preishueber-Pflugl, Yasser Qaragoez, Hamed Rahmani, Hendrik Rogier, Jose Romero Lopera, Luca Roselli, Dominique Schreurs, Manos Tentzeris, Xi Tian, Russel Torah, Ricardo Torres, Patrick Van Torre, Dieff Vital, Steve Beeby
Summary: This paper presents a comprehensive review of the role of microwave technologies in enabling the next generation of wearable devices. It discusses enabling technologies, key integration platforms, and emerging research trends, providing a future roadmap for interdisciplinary research in sustainable and reliable next-generation wearables.
IEEE JOURNAL OF MICROWAVES
(2023)
