IEEE Xplore
... into the application of orthogonal frequency division multiplexing (OFDM) in conjunction with UAV-based FSO technology, with ... pioneering 4-level quadrature amplitude modulation (4-QAM)-OFDM-FSO framework tailored for UAV-to-ground communication, ... crucial stepping stone for the practical application of OFDM-UAV-FSO communication systems, representing a paradigm shift ... throughput, resilience, and spectral efficiency, the application of OFDM is proposed. The research considers the transmission of ... of pointing errors. Furthermore, the simultaneous use of OFDM adaptive beam divergence control and modulation could significantly ...
Tópico(s): UAV Applications and Optimization
2024 - Springer Science+Business Media | Optical and Quantum Electronics
IEEE Xplore
Zeyad A. H. Qasem, Amjad Ali, Bohua Deng, Qian Li, H. Y. Fu,
... which is based on discrete Hartley transform (DHT-OFDM) instead of conventional discrete Fourier transform-based OFDM (DFT-OFDM). Although DHT-OFDM has been previously studied in various applications such ... In this paper, we first demonstrate that DHT-OFDM can inherit all advantages of conventional DFT-OFDM with less computational complexity and higher robustness to ... track the UWOC channel effects. Furthermore, IM-DHT-OFDM has been presented to provide better flexibility of ... must be kept idle. For instance, IM-DHT-OFDM provides up to 50% spectral efficiency improvement compared ...
Tópico(s): Advanced Wireless Communication Technologies
2023 - Elsevier BV | Optics & Laser Technology
... to enhance coherent optical orthogonal frequency-division multiplexing (OFDM) system by using index modulation in terms of ... of the fiber nonlinearity. In the coherent optical OFDM with index modulation system (CO-OFDM-IM), the information is conveyed not only through ... transmitted symbol rates. Unlike the conventional coherent optical OFDM (CO-OFDM) system, adjusting the number of the active subcarriers in the CO-OFDM-IM system provides improved BER performance and reduction ... The simulation results illustrate that the proposed CO-OFDM-IM system has better BER performance when the ...
Tópico(s): PAPR reduction in
2022 - Institute of Electrical and Electronics Engineers | IEEE Access
Xiangming Cai, Weikai Xu, Lin Wang, Georges Kaddoum,
... frequency division multiplexing differential chaos shift keying (JECD-OFDM-DCSK) system is presented in this paper, where the reference and information-bearing signals of JECD-OFDM-DCSK are superimposed in the same time slot ... and information-bearing signals is addressed. In JECD-OFDM-DCSK, only some subcarriers are activated and additional ... ratio (PAPR) performance and system complexity of JECD-OFDM-DCSK are analyzed and then compared to other systems. The comparison results show JECD-OFDM-DCSK can obtain higher energy efficiency and better ...
Tópico(s): Radar Systems and Signal Processing
2022 - IEEE Communications Society | IEEE Transactions on Communications
Peixuan Li, Lizhi Zhu, Xihua Zou, Wei Pan, Hui Zhang, Ningyuan Zhong, Lianshan Yan,
... on the constant-envelope orthogonal frequency division multiplexing (OFDM) (CE-OFDM) technique. A critical benefit of employing CE-OFDM is its excellent tolerance to the nonlinear distortions, ... thanks to the analog angle modulation transforming the OFDM signal to a constant envelope signal, the carrier- ... modulation can be implemented for encoding the CE-OFDM signal onto the optical carrier, leading to significant ... of 2-GHz 64-quadrature amplitude modulation (QAM) OFDM baseband signal, the achieved experimental results show that ...
Tópico(s): Advanced Fiber Laser Technologies
2022 - Institute of Electrical and Electronics Engineers | Journal of Lightwave Technology
... modulation-orthogonal frequency division multiplexing (4D TCM 16QAM-OFDM) combined with precoding scheme is proposed and experimentally ... the sub-carriers of the 4D TCM 16QAM-OFDM signals. Orthogonal circulant matrix transform (OCT) precoding, discrete ... over the data subcarriers of 4D TCM 16QAM-OFDM signals. Moreover, DFT precoding and CAZAC precoding can ... average power ratio (PAPR) of 4D TCM 16QAM-OFDM signals. After 50km single-mode fiber (SMF) and ... 8×10 −3 , compared with 4D TCM 16QAM-OFDM using OCT precoding and DFT precoding, 4D TCM ...
Tópico(s): Advanced Fiber Optic Sensors
2022 - Institute of Electrical and Electronics Engineers | Journal of Lightwave Technology
Mohamed S. Elbakry, Abdulwahid Mohammed, Tawfik Ismail,
... achieve high data rates. Orthogonal frequency division multiplexing (OFDM) is a powerful scheme for intensity modulation and ... detection (IM-DD) that is becoming increasingly important. OFDM systems based on VLC are accomplished through the ... IM-DD constraints, including direct current biased optical OFDM (DCO-OFDM), asymmetrically clipped optical OFDM (ACO-OFDM), and asymmetrically clipped DC-biased (ADO-OFDM), among others. The OFDM technique based on VLC is inefficient in terms ... throughput maximization and PAPR reduction in the DCO-OFDM, ACO-OFDM, and ADO-OFDM systems. Furthermore, the ...
Tópico(s): Optical Network Technologies
2022 - Springer Science+Business Media | Optical and Quantum Electronics
Ali Tuğberk Doğukan, Omer Furkan Tugtekin, Ertuğrul Başar,
Orthogonal frequency division multiplexing with index modulation (OFDM-IM), which transmits information bits via $M$ -ary constellation symbols and indices of the active subcarriers, is a promising OFDM-based multicarrier transmission scheme. Recently, several new schemes ... been proposed by utilizing the flexibility of the OFDM-IM to meet the diverse needs of 5G networks. Coordinate interleaved OFDM-IM (CI-OFDM-IM) that conveys the real and imaginary part of the data symbols over different subcarriers and OFDM with power distribution IM (OFDM-PIM) that transmits ...
Tópico(s): Optical Wireless Communication Technologies
2022 - IEEE Communications Society | IEEE Communications Letters
Simeng Feng, Qihui Wu, Chao Dong, Baolong Li,
... wireless communications (OWC), the conventional asymmetrically clipped O-OFDM (ACO-OFDM) is easy to be implemented, but suffers from ... Although more advanced schemes, such as layered ACO-OFDM, can improve spectral efficiency by superimposing multiple streams of O-OFDM signals for simultaneous transmission, the receiver complexity is increased with the number of the superimposed O-OFDM signals. Therefore, in this letter, considering the balance ... efficiency and receiver complexity, a spectrum enhanced ACO-OFDM (SEACO-OFDM) scheme is proposed with a novel ...
Tópico(s): Optical Network Technologies
2022 - IEEE Communications Society | IEEE Communications Letters
Jun Li, Shuping Dang, Yu Huang, Pengxu Chen, Xiaomin Qi, Miaowen Wen, Hüseyin Arslan,
... frequency division multiplexing with index modulation (C-MM-OFDM-IM) scheme to increase the spectral efficiency (SE) of OFDM-IM systems by extending the indexing to the energy and constellation domains. In C-MM-OFDM-IM, the information bits are mapped to not ... propose a variant IM scheme named C-MM-OFDM-IM-II to build a new mapping rule ... of further increasing the SE of C-MM-OFDM-IM. Upper-bounded bit error rate (BER) and ... form to evaluate the performance of C-MM-OFDM-IM(-II). Moreover, we further propose two enhanced ...
Tópico(s): Optical Wireless Communication Technologies
2022 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Wireless Communications
Mulundumina Shimaponda-Nawa, Oluwafemi Kolade, Ling Cheng,
... Recently, a permutation coded orthogonal frequency division multiplexing (OFDM) with the $M$ -ary frequency shift keying ( $M$ FSK) scheme, in short, PC OFDM- $M$ FSK, was proposed for IN mitigation in ... since one of the disadvantages of the PC OFDM- $M$ FSK scheme compared to that using only the classical OFDM scheme, is degraded data rate, we propose a generalised PC OFDM- $M$ FSK scheme to improve the degraded data rate. This study shows that the use of OFDM- $M$ FSK improves the performance of an HPV ...
Tópico(s): PAPR reduction in
2022 - Institute of Electrical and Electronics Engineers | IEEE Access
T. Deepa, Suseela Vappangi, Venkata Mani Vakamulla,
... schemes are proposed to reduce PAPR in optical OFDM-VLC systems. • DHMT precoded DHT-DCO-OFDM system is proposed for reducing PAPR. • Comparative analysis ... carried out. • Mathematical derivations for the precoded DCO-OFDM system are presented. • DHMT-DHT-DCO-OFDM achieves better PAPR, BER, and spectral efficiency performance. ... renowned modulation scheme like orthogonal frequency division multiplexing (OFDM) to accomplish high data rate transmission. However, the optical OFDM system like DC biased optical OFDM (DCO-OFDM) ...
Tópico(s): Optical Network Technologies
2022 - Elsevier BV | Optics & Laser Technology
Wenjing Yan, Xiaojun Yuan, Xuanyu Cao,
... a frequency RM (FRM) method for RIS-aided OFDM systems. The FRM-OFDM scheme modulates the frequency of the incident electromagnetic ... hopping states of RIS elements. Unlike the ORM-OFDM scheme, the FRM-OFDM scheme can achieve higher reflection efficiency, since the ... the multiplicative multiple access channel in the FRM-OFDM system can be converted to an equivalent RIS- ... algorithm for sum rate maximization of the FRM-OFDM system. A low-complexity recursive AO algorithm is ... well as the superiority of the proposed FRM-OFDM scheme over the existing ORM-OFDM scheme and ...
Tópico(s): Advanced Antenna and Metasurface Technologies
2022 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Wireless Communications
Conventional optical orthogonal frequency division multiplexing (OFDM) schemes, such as adaptively biased optical OFDM (ABO-OFDM) and hybrid asymmetrically clipped optical OFDM (HACO-OFDM), are unable to tap all the resources of ... In this paper, a hybrid adaptive bias optical OFDM (HABO-OFDM) scheme for visible light communication (VLC) is proposed ... efficiency and power efficiency. In the proposed HABO-OFDM scheme, different optical OFDM components are combined for transmission at the same ...
Tópico(s): Advanced Wireless Communication Technologies
2021 - Multidisciplinary Digital Publishing Institute | Photonics
Baolong Li, Xiaomei Xue, Simeng Feng, Wei Xu,
... transmission, dimmable optical orthogonal frequency division multiplexing (O-OFDM) has attracted increasing attentions in visible light communication ( ... A major design challenge in the dimmable O-OFDM is to realize spectrally efficient VLC link compatible ... is conceived, named as adaptively biased layered O-OFDM (ABLO-OFDM), which can be well integrated with the industry- ... Similar to the conventional layered asymmetrically clipped O-OFDM (LACO-OFDM), multiple layers of subcarriers are utilized to transmit ...
Tópico(s): Advanced Photonic Communication Systems
2021 - Institute of Electrical and Electronics Engineers | Journal of Lightwave Technology
Ganesh Miriyala, Venkata Mani Vakamulla,
... DC-biased optical-orthogonal frequency-division multiplexing (LADO-OFDM) for visible light communication (VLC) systems. The main ... the even subcarriers correspond to DC biased optical-OFDM (DCO-OFDM) and asymmetrically clipped optical-OFDM (ACO-OFDM) at the transmitter section. Thus, the demodulation process ... when compared to asymmetrically clipped DC-biased optical-OFDM (ADO-OFDM). The performance of the proposed LADO-OFDM is studied under two generalized light-emitting diode ( ... scheme is improved in comparison with the ADO-OFDM. Thus, the proposed scheme outperforms the ADO-OFDM ...
Tópico(s): Semiconductor Lasers and Optical Devices
2021 - Elsevier BV | Optik
... constructed clipped optical orthogonal frequency division multiplexing (AC-OFDM) is proposed for visible light communication (VLC) systems, ... property is imposed directly in time domain. AC-OFDM has nearly the same spectral efficiency and peak- ... power ratio (PAPR) as traditional asymmetrically clipped optical OFDM (ACO-OFDM) but is less complex to implement. Layered AC-OFDM (LAC-OFDM) is then proposed as an extension to further improve spectral efficiency, where different layers of AC-OFDM signals are added in the time domain and ...
Tópico(s): Advanced Photonic Communication Systems
2021 - Optica Publishing Group | Optics Express
Summary The application of orthogonal frequency division multiplexing (OFDM) in a visible light communication (VLC) system increases ... issue in an asymmetrically clipped DC‐biased optical OFDM (ADO‐OFDM) system. In this paper, a hybrid scheme is ... as to mitigate the nonlinearity in an ADO‐OFDM system. The proposed method is a combination of two ADO‐OFDM formats: precoded ADO‐OFDM and μ ‐ADO‐OFDM. The preprocessing of the input using a predetermined ... error rate (BER) performance of the traditional ADO‐OFDM system for μ ≤128. The combination of precoder ...
Tópico(s): Optical Network Technologies
2021 - Wiley | International Journal of Communication Systems
Xiaoyu Zhang, Zunaira Babar, Periklis Petropoulos, Harald Haas, Lajos Hanzo,
Optical Orthogonal Frequency-Division Multiplexing (O-OFDM) is eminently suitable for mitigating the multi-path and chromatic dispersion in both Visible Light Communications (VLC) and Optical Fiber Communications. We ... surveying the conception and historic evolution of O-OFDM designed for both VLC and optical fiber, culminating ... flexible design alternative, namely Layered Asymmetrically Clipped Optical OFDM (LACO-OFDM). We demonstrate that it is eminently suitable for ... flexibility, it subsumes a wide range of optical OFDM schemes conceived over the past two decades or ...
Tópico(s): Advanced Photonic Communication Systems
2021 - Institute of Electrical and Electronics Engineers | IEEE Communications Surveys & Tutorials
Jean‐Paul M. G. Linnartz, Xiong Deng,
... For this purpose, dedicated schemes such as Flip-OFDM and Assymetrically Clipped Optical (ACO)-OFDM have been proposed. We derive a common mathematical ... Exploiting this insight, we propose Continuous Phase Flip-OFDM (CP-Flip-OFDM) as an enhancement to Flip-OFDM. It ensures phase continuity at the transition between the two successive copies of the OFDM blocks, thereby it obviates the Cyclic Midfix between the first OFDM block and its flipped copy. Simultaneously, we derive ... compute-intensive way to generate and detect ACO-OFDM. Instead of creating an Hermitian-symmetry at the ...
Tópico(s): Advanced Photonic Communication Systems
2021 - Elsevier BV | Signal Processing
... of orthogonal frequency-division multiplexing with index modulation (OFDM-IM), this paper first presents an improved index ... efficiency problem of IM techniques in general and OFDM-IM in particular. OFDM-IIM is realized by deriving the minimum required ... active subcarriers in each group, of the conventional OFDM-IM technique. It is proven that OFDM-IIM can deliver higher spectral and energy efficiencies than classical OFDM and OFDM-IM. The gains come at the expense of increased detection complexity. Therefore, a proposal of OFDM with generalized IM (OFDM-GIM) technique is presented, ...
Tópico(s): Nanocluster Synthesis and Applications
2021 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Wireless Communications
Chao Xu, Yifeng Xiong, Naoki Ishikawa, Rakshith Rajashekar, Shinya Sugiura, Zhaocheng Wang, Soon Xin Ng, Lie‐Liang Yang, Lajos Hanzo,
... processing of high-bandwidth orthogonal frequency division multiplexing (OFDM) becomes increasingly power-thirsty, owing to the following OFDM deficiencies: (1) the high peak-to-average power ... achieved at the cost of compromising some of OFDM's beneficial properties, such as its subcarrier (SC) ... termed as multi-band discrete Fourier transform spread-OFDM with index modulation (MB-DFT-S-OFDM-IM), where the component multi-carrier techniques are ... constructively function together in order to mitigate the OFDM deficiencies without compromising the beneficial OFDM properties . More ...
Tópico(s): PAPR reduction in
2021 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Wireless Communications
Miaowen Wen, Jun Li, Shuping Dang, Qiang Li, Shahid Mumtaz, Hüseyin Arslan,
Orthogonal frequency division multiplexing with subcarrier number modulation (OFDM-SNM) has been recently proposed to improve the spectral efficiency (SE) of the traditional OFDM system. In this paper, we propose a joint-mapping OFDM-SNM (JM-OFDM-SNM) scheme to transmit the signal vector with ... closed-form to evaluate the performance of JM-OFDM-SNM. To suit different application scenarios, we further propose two enhanced schemes, named adaptive JM-OFDM-SNM (AJM-OFDM-SNM) and JM-OFDM with in-phase/quadrature ...
Tópico(s): Satellite Communication Systems
2021 - IEEE Communications Society | IEEE Transactions on Communications
Samir M. Hameed, Sinan M. Abdulsatar, Atheer A. Sabri,
... a case study. The orthogonal frequency division multiplexing (OFDM) systems are used to investigate Intensity modulation/direct ... The IM/DD in OWC requires positive real OFDM symbols, so there are many approaches to satisfy ... model of Asymmetrically Clipped DC-Biased Optical (ADO-OFDM) to use in OWC/VLC environment. The proposed ... cancellation technology that is used in traditional ADO-OFDM. The results show that the ADO-OFDM has the best spectral efficiency than DC-biased optical (DCO-OFDM) and Asymmetrically clipped optical (ACO-OFDM). Also, it ...
Tópico(s): PAPR reduction in
2021 - Springer Science+Business Media | Optical and Quantum Electronics
Baolong Li, Wei Xu, Zhengquan Li, Ying Zhou,
... current biased optical orthogonal frequency division multiplexing (DCO-OFDM), a constant DC bias is introduced to render ... Therefore, we conceive a novel adaptively biased optical OFDM (ABO-OFDM) for optical wireless communication (OWC), where the bias ... information data. The implementation complexity of the ABO-OFDM transceiver is almost the same as asymmetrically clipped optical OFDM (ACO-OFDM), which is notably lower than the superimposed OFDM schemes. Numerical results have demonstrated that the proposed ...
Tópico(s): Advanced Photonic Communication Systems
2020 - Institute of Electrical and Electronics Engineers | IEEE Wireless Communications Letters
Ahmad Jaradat, Jehad M. Hamamreh, Hüseyin Arslan,
... active subcarriers within each orthogonal frequency division multiplexing (OFDM) subblock. The proposed scheme is different from the conventional OFDM-subcarrier number modulation (OFDM-SNM) and OFDM-index modulation (OFDM-IM), in which data bits are transmitted using ... spectral and energy efficiency compared to its counterparts OFDM-SNM and OFDM-IM, especially at low modulation orders such as ... much superior BER performance compared to that of OFDM-IM and classical OFDM under equivalent power and ...
Tópico(s): graph theory and CDMA systems
2020 - Institute of Electrical and Electronics Engineers | IEEE Access