Results 1 to 10 of about 292 (169)
Bipolar Optical Code Division Multiple Access Techniques Using a Dual Electro-Optical Modulator Implemented in Free-Space Optics Communications [PDF]
Sensors, 2020 This study developed a bipolar optical code division multiple access (Bi-OCDMA) technique based on spectral amplitude coding for the formation and transmission of optical-polarized and coded signals over wireless optical channels.
Shin-Pin Tseng +3 more
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A Family of Optimal Multiple-Weight Optical Orthogonal Codes for Fiber-Optic Networks.
Comput Intell Neurosci, 2022 Optical orthogonal codes (OOCs) were designed for multimedia optical CDMA systems with quality of service requirements in optical fiber networks. Two‐dimensional (2‐D) multiple‐weight optical orthogonal codes have been invested as they can overcome the drawbacks of nonlinear effects in large spreading sequences.
Xu D, Cao H.
europepmc +2 more sources
Suitable Combination of Direct Intensity Modulation and Spreading Sequence for LIDAR with Pulse Coding [PDF]
Sensors, 2018 In the coded pulse scanning light detection and ranging (LIDAR) system, the number of laser pulses used at a given measurement point changes depending on the modulation and the method of spreading used in optical code-division multiple access (OCDMA ...
Gunzung Kim, Yongwan Park
doaj +2 more sources
IET Communications, Volume 16, Issue 14, Page 1731-1738, August 2022., 2022 Abstract Traditional optical orthogonal code has small code cardinality, which is vulnerable to the brute‐force attacks by eavesdroppers. In order to improve the anti‐interception performance of optical fibre communication system based on optical coding, a new family of optical code with large code cardinality is proposed.
Mandong Liu +3 more
wiley +1 more source
Investigation and demonstration of all‐optical hybrid fiber‐FSO‐fiber CDMA communication system
IET Communications, Volume 16, Issue 3, Page 246-254, February 2022., 2022 Abstract The authors investigate and demonstrate an all‐optical hybrid fiber‐free space optical (FSO)‐fiber communication system based on optical code division multiple access (OCDMA). Under different turbulence effects, the interception probability and interception distance are used as security metrics, and optimal parameters are obtained when the ...
Fang Peng +4 more
wiley +1 more source
Constructions of Optimal Optical Orthogonal Codes with Weights Set {5,7} via Cyclic Packing
Mathematical Problems in Engineering, Volume 2022, Issue 1, 2022., 2022 Double‐weight optical orthogonal codes are variable‐weight optical orthogonal codes (OOCs), which have been widely applied in optical networks and systems. Some works have been devoted to optimal (n, W, 1, Q)‐OOCs with max{w : w ∈ W} ≤ 6. So far, there is no explicit construction of optimal (n, W, 1, Q)‐OOCs with W = {5,7}.
Bichang Huang +3 more
wiley +1 more source
Effect of Dual Reinforcement on Wear Resistance by Aluminum Compacts Reinforce by SiC, Al2O3 [PDF]
Engineering and Technology Journal, 2009 The producing composite materials of dual reinforcement in which the matrix material is aluminum reinforced with two types of ceramic particles : which are Alumina (50μmKeywordscomposite materials; wear test ; Al2O3; SiC ...
Mohammed Waheed, Hassan Abed
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Applied Sciences, 2021 In this study, a bipolar optical code-division multiple-access (Bi-OCDMA) technique based on spectral amplitude coding (SAC) was proposed by using a phase modulator to realize polarization coding through a free-space optical (FSO) channel.
Eddy Wijanto, Chun-Ming Huang
doaj +1 more source
Wireless Communications and Mobile Computing, Volume 2022, Issue 1, 2022., 2022 Optical fiber communication is known as the backbone of communication today for voice, video, and data transmission. Recent advancements in optical technologies are leading us to many new forms of generation of orbital angular momentum (OAM) waves and its transmission technologies.
Manisha Khulbe +2 more
wiley +1 more source
Improvement of the Performance of OCDMA By Using Error Correction Code [PDF]
Engineering and Technology Journal, 2009 In this paper a new approach is proposed for enhancement of the datatransmission optical communication systems by applying CDMA technique based error detection and correction code.
Hosham Salim, JafarM. Daif
doaj +1 more source