Results 41 to 50 of about 20,276,485 (162)
A New Prime Code for Synchronous Optical Code Division Multiple‐Access Networks
Journal of Computer Networks and Communications, Volume 2018, Issue 1, 2018., 2018 A new spreading code based on a prime code for synchronous optical code‐division multiple‐access networks that can be used in monitoring applications has been proposed. The new code is referred to as “extended grouped new modified prime code.” This new code has the ability to support more terminal devices than other prime codes. In addition, it patches
Huda Saleh Abbas +3 more
wiley +1 more source
Reduction of interchannel interference noise in a two-channel grating-based OCDMA system using a nonlinear optical loop mirror [PDF]
, 2001 We show that a nonlinear optical switch can be used to suppress the interchannel noise generated under multiuser operation within a coherent, direct-sequence optical code-division multiple-access (OCDMA) system.
Teh, P.C. +4 more
core +1 more source
A New Code Family for QS-CDMA Visible Light Communication Systems
Journal of Telecommunications and Information Technology, 2018 Visible light communication (VLC) is a promising technology for wireless communication networks. Optical code division multiple access (OCDMA) is a strong candidate for VLC-based applications. The predominant source of bit error in OCDMA is the multiple
Mouad Addad, Ali Djebbari
doaj +1 more source
Design and Analysis of Self‐Healing Tree‐Based Hybrid Spectral Amplitude Coding OCDMA System
Security and Communication Networks, Volume 2017, Issue 1, 2017., 2017 This paper presents an efficient tree‐based hybrid spectral amplitude coding optical code division multiple access (SAC‐OCDMA) system that is able to provide high capacity transmission along with fault detection and restoration throughout the passive optical network (PON).
Waqas A. Imtiaz +6 more
wiley +1 more source
Reduction of multiple access interference in OCDMA systems using a semiconductor based TPA device [PDF]
, 2007 The authors present a simulation model and results for a four user OCDMA system operating at an overall data rate of 4 Gb/s (4 x 1 Gb/s). The work presents the novel use of a nonlinear detector based on TPA for simultaneous thresholding and detection in ...
Barry, Liam P. +5 more
core +2 more sources
Chip-Asynchronous Binary Optical CDMA: An Optimum Signaling Scheme for Random Delays
IEEE Photonics Journal, 2013 Most optical code division multiple access (OCDMA) research literature has focused on chip-synchronous OCDMA. However, practical OCDMA networks are inherently chip-asynchronous since users transmit their signals from different locations without any ...
Salman A. Khan, Jan Bajcsy
doaj +1 more source
Design and Investigation of 10 Gb/s FSO Wiretap Channel Using OCDMA Time-Diversity Reception
IEEE Photonics Journal, 2020 In this paper, 10 Gb/s free space optical (FSO) wiretap channel using optical code division multiple access (OCDMA) time-diversity reception is designed and demonstrated for the first time.
Jianhua Ji +4 more
doaj +1 more source
Modified Three‐Dimensional Multicarrier Optical Prime Codes
International Journal of Optics, Volume 2016, Issue 1, 2016., 2016 We propose a mathematical model for novel three‐dimensional multicarrier optical codes in terms of wavelength/time/space based on the prime sequence algorithm. The proposed model has been extensively simulated on MATLAB for prime numbers (P) to analyze the performance of code in terms of autocorrelation and cross‐correlation.
Rajesh Yadav +2 more
wiley +1 more source
Noncoherent Spectral Optical CDMA System Using 1D Active Weight Two‐Code Keying Codes
Mathematical Problems in Engineering, Volume 2016, Issue 1, 2016., 2016 We propose a new family of one‐dimensional (1D) active weight two‐code keying (TCK) in spectral amplitude coding (SAC) optical code division multiple access (OCDMA) networks. We use encoding and decoding transfer functions to operate the 1D active weight TCK. The proposed structure includes an optical line terminal (OLT) and optical network units (ONUs)
Bih-Chyun Yeh, Antonino Laudani
wiley +1 more source
Cyclic code‐shift extension keying for multi‐user optical wireless communications
Electronics Letters, Volume 51, Issue 11, Page 847-849, May 2015., 2015 An optical code‐division multiple access (OCDMA) scheme based on cyclic shift extension of a base code is proposed to enable asynchronous multi‐user optical wireless communications for very populated scenarios. This multiple access method is convenient for low–medium data rate communications of a large number of simultaneous transmitters. An expression
O. González +4 more
wiley +1 more source