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Two-Stage Code Acquisition in Wireless Optical CDMA Communications Using Optical Orthogonal Codes
2016
IEEE Transactions on Communications
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Memory introduced by temporal correlation of optical fading process precludes us from using Markov chain model for code acquisition analysis. ...
In this paper, we analyze the performance of code acquisition system in atmospheric optical code division multiple access (OCDMA) communications using optical orthogonal codes (OOCs). ...
OCDMA via optical orthogonal codes (OOCs) was first introduced for fiber-optic networks using intensity modulation and direct detection (IM/DD) technique [1] , [2] . ...
doi:10.1109/tcomm.2016.2577685
fatcat:zoektldd3zf5bhhtsd736ozyiq
Improving Availability and Confidentiality via Hyperchaotic Baseband Frequency Hopping Based on Optical OFDM in VLC Networks
2020
IEEE Access
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ACKNOWLEDGMENT The authors thank the Deanship of Scientific Research and RSSU at King Saud University for their technical support. ...
Funding: This work was supported by the Deanship of Scientific Research through the initiative of DSR Graduate Students Research Support (GSR). ...
and direct detection (IM/DD) scheme. ...
doi:10.1109/access.2020.3007429
fatcat:wlvgovv62vdn3ehut7u6apf6gi
Doubly Orthogonal Wavelet Packets for Multi-Users Indoor Visible Light Communication Systems
2019
Photonics
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To combat, Multi-carrier Code Division Multiple Access (MC-CDMA) is a favorable technique for achieving higher data rates along with reduced Inter-Symbol Interference (ISI) and easy access to multi-users ...
Moreover, the design also comprises suitable signature codes, which are generated by employing double orthogonality depending upon Walsh codes and Wavelet Packets. ...
Acknowledgments: The authors would highly gratitude to the University of Lahore and Taif University for providing us the physical resources required to accomplish the experiments and writing of this manuscript ...
doi:10.3390/photonics6030085
fatcat:qphrkjoqgfb6lntv4dwtzieji4
Wireless infrared communications
1997
Proceedings of the IEEE
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Physical characteristics of infrared channels using intensity modulation with direct detection (IM/DD) are presented, including path losses and multipath responses. ...
Strategies for designs of transmitters and receivers that maximize link signal-to-noise ratio (SNR) are described. ...
Table 1 1 Comparison Between Radio and IM/DD Infrared Systems for Indoor Wireless Communication Property of Medium
Radio
IM/DD Infrared
Implication for IR
Bandwidth Regulated? ...
doi:10.1109/5.554222
fatcat:j6xyokpjdnaqzku4atoignxhkm
Beyond the 100 Gbaud directly modulated laser for short reach applications
2021
Journal of Semiconductors
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IM/DD system, and the main bottleneck is the modulation bandwidth of the DML. ...
It is very attractive to apply a directly modulated laser (DML)-based intensity-modulation and direct-detection (IM/DD) system in future data centers and 5G fronthaul networks due to the advantages of ...
The traditional binary on-off keying (OOK) modulation method can reach a rate of 20 Gb/s or more in an IM/DD system. ...
doi:10.1088/1674-4926/42/4/041306
fatcat:wehfhnwhevc4fmo3spcnmhp364
White Paper on Broadband Connectivity in 6G
[article]
2020
arXiv
pre-print
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At the spectrum level, the network must seamlessly utilize sub-6 GHz bands for coverage and spatial multiplexing of many devices, while higher bands will be used for pushing the peak rates of point-to-point ...
Different categories of use cases are considered, from extreme capacity with peak data rates up to 1 Tbps, to raising the typical data rates by orders-of-magnitude, to support broadband connectivity at ...
It is part of a series of twelve 6G white papers to be published in their final format in June 2020. ...
arXiv:2004.14247v1
fatcat:doom4rvlf5aafmtwpdxbyu6dke
Interference in multi-user optical wireless communications systems
2020
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
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Lastly, we review the state of existing research in this area and recommend areas for further study. This article is part of the theme issue 'Optical wireless communication'. ...
Visible light communications (VLC) (including LiFi) represent a subset of the broader field of optical wireless communications. ...
With the use of IM/DD, optical signals transmitted are real-valued and non-negative [11] . ...
doi:10.1098/rsta.2019.0190
pmid:32114917
pmcid:PMC7062004
fatcat:ruoh3spa5vcmvmcrchpyk5vyx4
2020 Index Journal of Lightwave Technology Vol. 38
2020
Journal of Lightwave Technology
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Multicore Fiber Skew Effects for Radio Over Fiber mmWave Antenna Beamforming; 1644-1650acterization of Ultra-Narrow Linewidth Lasers for Phase-Sensitive Coherent Reflectometry Using EOM Facilitated Heterodyning ...
, T., Mirror-Based Broadband Silicon-Photonics Vertical I/O With Coupling Efficiency Enhancement for Standard Single-Mode Fiber; JLT June 15, 2020 3147-3155 Norman, J., see Bhasker, P., 2308-2314 Novack ...
., +, JLT Feb. 15, 2020 769-776 DSP for High-Speed Short-Reach IM/DD Systems Using PAM. ...
doi:10.1109/jlt.2021.3055125
fatcat:u7gqk2ifxrdhrpzjh5uzgv3j6q
Indoor Visible Light Communication: A Tutorial and Survey
2020
Wireless Communications and Mobile Computing
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This revolution comes with numerous advantages and viable opportunities that can transform the world of wireless communications for the better. ...
With the advancement of solid-state devices for lighting, illumination is on the verge of being completely restructured. ...
Acknowledgments We would like to acknowledge the Botswana International University of Science and Technology (BIUST) for research funding. ...
doi:10.1155/2020/8881305
fatcat:wypzpfvejjdsjlqy4b6jitjiwe
A Printed Microstrip Antenna for RADAR Communication
2012
IOSR Journal of Electronics and Communication Engineering
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Simulated antenna size has been reduced by 48.11% with an increased frequency ratio when compared to a Conventional microstrip patch antenna. ...
The first one is the combinations of two triangular and another rectangular slot at the upper right corner and rest is bilateral triangle at the lower left corner from the conventional microstrip patch ...
Chowdhury gratefully acknowledged, the financial support for this work provided by AICTE (India) in the form of a project entitled "DEVELOPMENT OF COMPACT, BROADBAND AND EFFICIENT PATCH ANTENNAS FOR MOBILE ...
doi:10.9790/2834-0350104
fatcat:hjiqxqpsq5ecnfxrmxzl2i7i54
A guide to wireless networking by light
2017
Progress in Quantum Electronics
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Harald Haas also would like to acknowledge support of the EPSRC under the Established Career Fellowship, EP/K008757/1, "Tackling the Looming Spectrum Crises in Wireless Communications". ...
The authors would like to acknowledge the invaluable contributions of collaborators in Strathclyde, St. Andrews, Cambridge, Oxford, and Edinburgh to many of the results and work described here. ...
A number of designs of orthogonal codes are available to accommodate CDMA in a LAC network, such as optical orthogonal codes, unipolar m-sequences and Walsh-Hadamard codes. ...
doi:10.1016/j.pquantelec.2017.06.003
fatcat:uojqskq5aneu5ouo2uui573iza
Machine Learning Techniques for Optical Performance Monitoring and Modulation Format Identification: A Survey
2020
IEEE Communications Surveys and Tutorials
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b) Differential quadrature phase shift keying (DQPSK): In differential quadrature phase shift keying (DQPSK), each transmitted symbol carries two bits where the phase of the optical carrier hops between ...
detection (PM-DD): a) Differential binary phase shift keying (DBPSK): Differential binary phase shift keying (DBPSK) or simply DPSK systems that employing delay-demodulation or differential detection, ...
doi:10.1109/comst.2020.3018494
fatcat:qtspg36ylvbvhjil6u5or7seja
Optically transparent multiple access networks employing incoherent spectral codes
[article]
2008
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IM-DD systems are also severely limited by fading due to the experienced chromatic dispersion in the optical fiber. ...
A phase code is selected at its output and a polarization dependent high-speed 2×2 optical switch [156] is used for the spectral shift keying modulation. ...
State-of-the-art A pulsed dual-mode DFB laser is used in [195] to generate two optical carriers which are spaced by a given RF frequency. ...
doi:10.6100/ir635228
fatcat:52suvowwyjchphp6ogzfccsciq
Discrete multitone modulation for short-range optical communications
[article]
2009
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subcarrier (modulated with phase shift keying or QAM), or multiple subcarriers such as DMT. ...
optical IM/DD channel. ...
modulation
List of Abbreviations IM/DD: Intensity modulation and direct detection IPTV: Internet Protocol television IrDA: Infrared Data Association ISI: Inter-symbol interference IQ: In-phase and quadrature-phase ...
doi:10.6100/ir656509
fatcat:lh2tazhl3ne4ldwv3otkm6sgti
On the Performance of Free-Space Optical Systems over Generalized Atmospheric Turbulence Channels with Pointing Errors
2015
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higher-order amount of fading (AF), the average error rate for binary and M-ary modulation schemes, and the ergodic capacity (except for IM/DD technique, where closed-form lower bound results are presented ...
and both types of detection techniques (i.e. indirect modulation/direct detection (IM/DD) as well as heterodyne detection) is presented. ...
Shift Keying (CBFSK) 0.5 0.5 Coherent Binary Phase Shift Keying (CBPSK) 0.5 1 Non-Coherent Binary Frequency Shift Keying (NBFSK) 1 0.5 Differential Binary Phase Shift Keying (DBPSK) 1 1 and for the Gamma-Gamma ...
doi:10.25781/kaust-x87r9
fatcat:l3e6sxku3fd65cp7m6vzsj27la
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