Article
Engineering, Electrical & Electronic
Andrea Petroni, Gaetano Scarano, Roberto Cusani, Mauro Biagi
Summary: A modulation precoding scheme is proposed to maximize the minimum distance between received symbols in indoor visible light communication, simultaneously addressing communication and illumination issues. By operating adaptive power allocation on LEDs and optimizing constellation, the scheme maintains a low symbol error probability even in strong interference scenarios.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Joyce Yew Pei Ling, Zaiton Abdul Mutalip, Afif Hakim Hasanudin, Faezah Jasman, Zeina Rihawi
Summary: In the field of visible light communication (VLC) systems, carrier-less amplitude and phase modulation, specifically the CAP-4 scheme, has been found to have better performance compared to basic On-Off Keying. This study analyzes the performance of CAP-2, CAP-4, and CAP-8 based on bit-error-rate, constellation diagram, and eye diagram. CAP-4 has the lowest EVM (-10.90 dB) and highest MER (11.30 dB), indicating superior performance.
OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Selma Yahia, Yassine Meraihi, Souad Refas, Asma Benmessaoud Gabis, Amar Ramdane-Cherif, Hossien B. Eldeeb
Summary: This paper investigates the performance of a Vehicle-to-Vehicle VLC system using a Multiple-Input Multiple-Output (MIMO) scheme. The results demonstrate that deploying the MIMO with higher orders can significantly enhance the system performance.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Farhad Mehran, Konstantinos Nikitopoulos, Hamid Jafarkhani
Summary: The GSTSM technique allows for the simultaneous transmission of flexible-rate and highly reliable information streams without increasing packet length, using spatial and temporal dimensions efficiently. It is particularly effective in machine-type communications, offering significant throughput gains and improved performance in multi-user detection scenarios.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Qiangguo Zhou, Qinxi Qiu, Tuntan Wu, Yongzhen Li, Zhiming Huang
Summary: This article proposes a novel ultrawideband terahertz linear polarization converter, which has the characteristics of high-purity output and near-zero copolarization transmission in the full band. The physical mechanism of polarization conversion is elucidated through the analysis of surface current and electric field distribution. In addition, the influence of geometric parameters on the device is discussed, providing theoretical support for the design of high-performance polarization converters.
Article
Computer Science, Information Systems
Andrew Burton, Petr Chvojka, Paul Anthony Haigh, Zabih Ghassemlooy, Stanislav Zvanovec
Summary: This paper introduces a wavelength-division multiplexing visible light communication system based on a defocused non-imaging MIMO, which utilizes the natural diversity of LEDs to generate an H-matrix without the need for optical bandpass filters. By transmitting independent sets of on-and-off keying signals on different wavelengths, the received superposed symbols can be demultiplexed. The system is empirically verified for K = 3 using red, green, and blue LEDs with varying Q-factors.
Article
Engineering, Electrical & Electronic
Jiang Chen, Jianyang Shi, Junhui Hu, Chao Shen, Nan Chi
Summary: This paper introduces carrierless amplitude and phase (CAP) as a high spectral efficiency modulation scheme in visible light communication (VLC) systems. The possibility of designing perfect DC-balanced PSFs is discussed, and the performance of odd-dimensional and even-dimensional PSFs is compared through simulations and experiments.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Ozgur Kara, Gokberk Yaylali, Ali Emre Pusane, Tuna Tugcu
Summary: As the potential of molecular communication via diffusion (MCvD) systems at nano-scale communication increases, designing molecular schemes robust to interference becomes crucial. This study proposes a convolutional neural network (CNN)-based architecture for a uniquely-designed molecular multiple-input-single-output topology to alleviate the effects of molecular interference and shows better performance compared to other methods.
NANO COMMUNICATION NETWORKS
(2022)
Article
Telecommunications
Sultan Aldirmaz-Colak, Erdogan Aydin, Yasin Celik, Yusuf Acar, Ertugrul Basar
Summary: This paper proposes a novel pulse index modulation (PIM) scheme for SISO systems, using Hermite-Gaussian pulses for data transmission and providing high spectral efficiency. To reduce complexity, a low complexity detector based on matched filtering is introduced. Analytical derivations and computer simulations show that the proposed PIM system outperforms existing spatial modulation (SM), code index modulation aided spread-spectrum (CIM-SS), CIM-SM, and traditional-ary systems in terms of error performance and SNR gain.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Telecommunications
Mohamed Al-Nahhal, Ertugrul Basar, Murat Uysal
Summary: The proposed magnitude and wrap-phase OFDM (MW-OFDM) scheme for MIMO VLC systems increases spectral efficiency, decreases decoding complexity, and improves average bit error rate compared to conventional GLIM-OFDM, with half the number of LEDs required for the same performance. Numerical results demonstrate the superiority of the proposed scheme over MIMO VLC channels.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Acoustics
Wentao Shi, Chengbing He, Qianqian Dang, Lianyou Jing
Summary: Index modulation (IM) has shown potential for enhancing spectral and energy efficiency in wireless communications, with the proposed single-carrier with index modulation (SC-IM) for underwater acoustic communications offering improved performance in combating severe channel effects. The frequency-domain turbo equalization (FDTE) with sparse channel estimation in the SC-IM system outperforms conventional frequency domain equalization, as demonstrated through simulation and lake experiments.
Article
Optics
Sunan Yao, Huaqing Chai, Lei Lei, Zihe Zhu, Guoqiang Li, Wenliang Wang
Summary: This study designs micro-LED arrays with different array numbers for high-speed visible light communication and lighting. The 2 x 2 array micro-LEDs exhibit a high modulation bandwidth of approximately 785 MHz at higher injection current, with a light output power over 7 mW, making them more suitable for visible light communication in free space.
Article
Engineering, Electrical & Electronic
Gevira Omondi, Hongjun Xu, Peter Akuon, Narushan Pillay
Summary: This paper investigates the multiple-input symbol generalised differential Golden code (MIS-GD-GC) scheme, which improves the error performance and achieves a higher diversity order to address the performance loss issue in conventional differential modulation systems.
INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS
(2022)
Article
Engineering, Electrical & Electronic
Raghav Sharma, Naveen Sisodia, Johan Akerman, P. K. Muduli
Summary: The modulation bandwidth (f(BW)) is a critical figure-of-merit for wireless communication applications of spin torque nano-oscillators (STNOs) as it determines the maximum data rate. A single-shot time-resolved measurements of a magnetic tunnel junction based STNO demonstrated that f(BW) can be many times larger under strong modulation, indicating a potential for future wireless applications. This behavior was qualitatively reproduced in macrospin simulations, suggesting that f(BW) of STNOs may not be as limiting a factor for future wireless applications as previously believed.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Optics
Zengyi Xu, Wenqing Niu, Jianyang Shi, Nan Chi
Summary: This paper introduces a nonlinear coded nonuniform superposition (NCNS) QAM technique, aiming to alleviate the nonlinearity effect caused by high instantaneous power in MISO visible light communication systems. Experimental results demonstrate that NCNS has better robustness against nonlinearity compared to pulse amplitude modulation 4, with approximately a 16% increase in maximum usable peak-to-peak voltage and a 33% enlargement in dynamic range area.
CHINESE OPTICS LETTERS
(2022)
Article
Optics
Zahra Nazari Chaleshtori, Stanislav Zvanovec, Zabih Ghassemlooy, Mohammad-Ali Khalighi
Summary: With the increasing use of organic light emitting diodes in various devices, visible light-based device-to-device communication is gaining importance. Researchers propose using smart phones' display pixels and built-in cameras for such communication and investigate the impact of receiver orientation and user mobility on link performance.
Article
Engineering, Electrical & Electronic
J. Bohata, D-N Nguyen, J. Spacil, D. Suslov, D. Dousek, S. Zvanovec, Z. Ghassemlooy, M. Komanec
Summary: This letter presents the results of an experimental measurement campaign using combined radio over fiber and radio over FSO technology in a cloud-based 5G fronthaul network. The results show excellent performance in terms of phase noise and signal-to-noise ratio, and also investigate the impact of atmospheric conditions on received mmW signals in the FSO channel.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Computer Science, Hardware & Architecture
Thomas Kamalakis, Zabih Ghassemlooy, Stanislav Zvanovec, Luis Nero Alves
Summary: This study analyzes the performance of a hybrid visible-light/infrared optical wireless communications network for indoor Internet-of-Things applications. It proposes an approach that connects multiple battery-powered sensor nodes using low-cost infrared light emitting diodes to transmit data, with a master node located on the ceiling of a room. The results demonstrate the suitability of this approach for sporadic transmission of low data rate signals and sensor readings in line with the requirements of massive machine-type communication fifth generation applications.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2022)
Article
Computer Science, Information Systems
Mahmoud Wafik Eltokhey, Mohammad-Ali Khalighi, Zabih Ghassemlooy
Summary: This study investigates the use of UAVs for on-demand communications, utilizing zero forcing pre-coding and UAV location optimization to manage multi-user interference and improve network throughput.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Pranav Sharda, Gundala S. Reddy, Manav R. Bhatnagar, Zabih Ghassemlooy
Summary: In this paper, a V2V-VLC model for different scenarios is proposed, and the performance of the model is analyzed. The research findings show that the lateral shift and longitudinal separation of vehicles have a significant impact on the system performance.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Xicong Li, Zabih Ghassemlooy, Stanislav Zvanovec, Luis Nero Alves, Monica Figueiredo, Min Zhang, Sreelal Maravanchery Mana, Volker Jungnickel, Petr Chvojka
Summary: This paper proposes a full-digital architecture for a practical carrier-less amplitude and phase (CAP) receiver for visible light communication (VLC). The proposed receiver utilizes two digital phase-locked loops (DPLL) for symbol timing and carrier synchronisation, and employs the constant-modulus algorithm (CMA) for blind equalisation. Simulation results show that the receiver architecture can successfully solve signal distortion and inter-symbol interference problems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Computer Science, Hardware & Architecture
Ehsan Soleimani-Nasab, Zabih Ghassemlooy
Summary: This paper proposes a multihop serial RF, FSO, and VLC system and investigates the link performance and diversity order under different channel conditions through simulations and derivations.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2022)
Article
Engineering, Electrical & Electronic
Jan Bohata, Dong-Nhat Nguyen, Pham Tien Dat, Zabih Ghassemlooy, Beatriz Ortega, Stanislav Zvanovec
Summary: This letter presents a method for data transmission and coverage extension in an indoor environment using the radio-over-fiber (RoF) technology and a 26 GHz millimeter-wave (mmW) radio signal. The proposed system consists of two RoF seamless wireless links to emulate a mobile fronthaul and overcome the higher attenuation of the mmW signal. Experimental evaluation shows the possibility of signal transmission over up to 20 km of optical fiber with minimal error vector magnitude for 64-QAM.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Jiandong Liu, Liang Chu, Bin Liu, Juan Liu, Yingying Hu, Xing-Dao He, Jinhui Yuan, Yangbo Zhou, Dejun Liu, Zabih Ghassemlooy, James Martin, Yong Qing Fu, Qiang Wu
Summary: This study proposes and experimentally demonstrates a highly sensitive hydrogen sensor coated with Pt/WO3 powder and erbium-doped fiber amplifier (EDFA). The sensor is constructed by splicing a tapered small-diameter coreless fiber (TSDCF) between two single-mode fibers (SMFs). The Pt/WO3 powder on the surface of a polydimethylsiloxane (PDMS) film coated on the TSDCF structure serves as the hydrogen-sensitive material. An EDFA is introduced to improve the Q factor and resolution of the sensor's output spectrum. The sensor exhibits good stability with a light intensity fluctuation of less than 1.26 dB over a 30-minute duration, and a maximum light intensity variation and sensitivity of -32.41 dB and -21.25 dB/%, respectively, when the hydrogen concentration varies from 0% to 1.44%.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Hongxu Wang, Huixin Zhang, Zabih Ghassemlooy, Tian Zhang
Summary: In this paper, a low-complexity and high-performance clipping-free multilayer optical orthogonal frequency division multiplexing (OFDM) scheme is proposed for optical wireless communication (OWC). The scheme arranges the symbols of multi-layer quadrature amplitude modulation (QAM) in the frequency domain to generate a bipolar time-domain signal using inverse fast Fourier transform (IFFT) at the transmitter. At the receiver, a zero-value regression (Re0) -based demodulation is proposed for optimizing the bit error rate (BER). The proposed scheme achieves similar system complexity as single-layer modulations and offers improved power efficiency and avoidance of interlayer interference.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2023)
Article
Computer Science, Information Systems
Tianming Huang, Bangjiang Lin, Zabih Ghassemlooy, Ningcong Jiang, Qiwei Lai
Summary: This article introduces a 3-D non-line-of-sight (NLOS) VLP system that uses a single LED and an image sensor (IS) to address the problem of obstructed LOS paths. The system utilizes an optical camera communication (OCC) subsystem to receive the transmitter's position based on NLOS links. The proposed system achieves a 90th percentile accuracy of < 22 cm for 3-D positioning and is the first to demonstrate 3-D NLOS VLP using just a single LED and an IS.
IEEE INTERNET OF THINGS JOURNAL
(2023)
Article
Optics
Xiangyu Wan, Bangjiang Lin, Zabih Ghassemlooy, Tianming Huang, Jiabin Luo, Yongqi Ding
Summary: Non-line-of-sight (NLOS) optical camera communications (OCC) provide better link availability and mobility compared to line-of-sight links. This study proposes an NLOS OCC system that maps data signals into color pulse width modulation (CPWM) symbols and uses a convolutional neural network for demodulation, effectively reducing intersymbol interference.
Article
Engineering, Electrical & Electronic
Vaigai Nayaki Yokar, Hoa Le-Minh, Zabih Ghassemlooy, Wai Lok Woo
Summary: In this study, the authors experimentally demonstrate the ability of the smartphone-to-smartphone-based visible light communications (S2SVLC) system to support high-quality multimedia transmissions. They investigate the mean square error estimation, peak signal-to-noise degradation, bit error rate, and data rate achieved under different conditions. The results show that the system's performance is significantly impacted by data transmission at different conditions.
IET OPTOELECTRONICS
(2023)
Article
Computer Science, Information Systems
Shivani Rajendra Teli, Carlos Guerra-Yanez, Vicente Matus Icaza, Rafael Perez-Jimenez, Zabih Ghassemlooy, Stanislav Zvanovec
Summary: This paper introduces a concept of a multilevel bipolar on-off keying hybrid optical wireless communication system for indoor IoT applications. The system utilizes a single LED as a transmitter and photodiode and camera-based receivers. Experimental results show that the proposed hybrid system improves the data rate and error rate of VLC and OCC links, respectively, by doubling the bandwidth. The scheme provides independent link performance regardless of the differences between the operating R-b of VLC and OCC over a range of transmission spans.
Proceedings Paper
Automation & Control Systems
Kshitija Dolas, Manav R. Bhatnagar
Summary: This paper studies the channel capacity of satellite systems under different adaptive transmission policies, and investigates the effect of channel fading and shadowing severity parameter on the capacity. The results show that the optimal simultaneous power and rate adaptation (OPRA) scheme achieves the highest capacity gain, while the channel inversion with fixed rate (TIFR) scheme suffers from large outage probability and capacity penalty compared to the optimal rate adaptation with constant transmit power (ORA) and OPRA schemes. Furthermore, increase in shadowing severity degrades the capacity of the satellite channel.
2023 IEEE 97TH VEHICULAR TECHNOLOGY CONFERENCE, VTC2023-SPRING
(2023)
