Download or read book 2 D Extended EDW the New Scheme of Two Dimensional Wavelength time Coding for Optical Code Division Multiple Access System written by Nurolhuda Mohd Noor and published by . This book was released on 2016 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: In OCDMA system, designing a successful code for isolating the users is one of the main issues that has to be tackled, due to its importance to mitigate the deleterious effect of MAI. The research presented in this thesis focuses on the code design of incoherent 2-D spectral temporal, SAC OCDMA system, namely 2-D Extended EDW code. Fig. 1. 1 illustrates the scope of the research, it is shown that the research will be focus on the family of Spectral Amplitude Coding (SAC) codes, and used wavelength-time or spectral-temporal technique to perform 2-D coding in OCDMA system.
Download or read book Optical Code Division Multiple Access Communication Networks written by Hongxi Yin and published by Springer Science & Business Media. This book was released on 2009-03-15 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical code division multiple access (OCDMA) communication network technology will play an important role in future optical networks, such as optical access and metropolitan area networks. OCDMA technology can also be applied to implement optical signal multiplexing and label switching on backbone networks. Optical Code Division Multiple Access Communication Networks - Theory and Applications introduces the code theory of OCDMA, the methods and technologies of OCDMA encoding and decoding, the theory and methods of analyzing OCDMA systems with various receiver models and realizing multiple-class services with different bit rates and QoS. In addition, OCDMA network architectures, protocols and applications are discussed in detail. The up-to-date theoretical and experimental results on OCDMA systems and networks are also reported. A large number of encoding/decoding examples and many analysis and simulation results of code and system performances are given. It is a valuable text and/or reference book for postgraduates majoring in telecommunication and photonics to obtain a well-knit theoretical foundation and for engineers in R&D and management of optical communications. Dr. Yin is an Associate Professor of the School of Electronics Engineering and Computer Science at Peking University, China, and was a Visiting Research Fellow of Optoelectronics Research Centre (ORC) at University of Southampton, UK. Dr. Richardson is a Professor for optical communications and Deputy Director of ORC at University of Southampton, UK, and is responsible for much of the ORC's fiber related activities.
Download or read book Analysis and Implementation of a Two dimensional Wavelength time Optical Code division Multiple access System written by Rhys Allan Adams and published by . This book was released on 2004 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The development and growth of new communication services and emerging applications requires high-performance access networks capable of providing high-bandwidth interconnections to end-users. In recent years, optical code-division multiple access (OCDMA) has been proposed as a means for providing flexible access to high-bandwidth applications and offering different levels of quality of service. This thesis explores the impact of encoder/decoder mismatch on system performance for 2 dimensional wavelength-time (2D lambda-t) OCDMA and the implementation of a multi-user 2D lambda-t OCDMA direct detection demonstrator system. Our analysis and experimental demonstrations are based on depth-first search codes (DFSCs) which have previously been shown to be attractive in OCDMA applications. We have developed an OCDMA system simulation model that quantifies the BER performance as wavelength and/or time misalignments (which cause mismatch in the encoder/decoder) increase. Furthermore, we have succeeded in encoding and decoding DFSCs as well as in demonstrating a 4-user system which has been implemented using standard commercially available off-the-shelf optical components." --
Download or read book IAENG Transactions on Engineering Technologies written by Gi-Chul Yang and published by Springer Science & Business Media. This book was released on 2014-07-08 with total page 763 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains fifty-eight revised and extended research articles written by prominent researchers participating in the Advances in Engineering Technologies and Physical Science conference, held in London, U.K., 4-6 July, 2012. Topics covered include Applied and Engineering Mathematics, Computational Statistics, Mechanical Engineering, Bioengineering, Internet Engineering, Wireless Networks, Knowledge Engineering, Computational Intelligence, High Performance Computing, Manufacturing Engineering, and industrial applications. The book offers the state of art of tremendous advances in engineering technologies and physical science and applications, and also serves as an excellent reference work for researchers and graduate students working on engineering technologies and physical science and applications.
Download or read book Optical Code Division Multiple Access written by Paul R. Prucnal and published by CRC Press. This book was released on 2018-10-03 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: Code-division multiple access (CDMA) technology has been widely adopted in cell phones. Its astonishing success has led many to evaluate the promise of this technology for optical networks. This field has come to be known as Optical CDMA (OCDMA). Surveying the field from its infancy to the current state, Optical Code Division Multiple Access: Fundamentals and Applications offers the first comprehensive treatment of OCDMA from technology to systems. The book opens with a historical perspective, demonstrating the growth and development of the technologies that would eventually evolve into today's optical networks. Building on this background, the discussion moves to coherent and incoherent optical CDMA coding techniques and performance analysis of these codes in fiber optic transmission systems. Individual chapters provide detailed examinations of fiber Bragg grating (FBG) technology including theory, design, and applications; coherent OCDMA systems; and incoherent OCDMA systems. Turning to implementation, the book includes hybrid multiplexing techniques along with system examples and conversion techniques to connect networks that use different multiplexing platforms, state-of-the-art integration technologies, OCDMA network security issues, and OCDMA network architectures and applications, including a look at possible future directions. Featuring contributions from a team of international experts led by a pioneer in optical technology, Optical Code Division Multiple Access: Fundamentals and Applications places the concepts, techniques, and technologies in clear focus for anyone working to build next-generation optical networks.
Download or read book A Novel 2 d Wavelength time Optical Code Division Multiple Access OCDMA Code for High performance System written by Amir Razif Arief Jamil Abdullah and published by . This book was released on 2013 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: The major contribution of the research work presented is the novel coding technique to enhance the system performance of the 2-D OCDMA network. The focus is on a development of newly 2-D wavelength-time spreading code sequences OCDMA system applied to the balance detection technique. The work establishes a mathematical model calculation for deriving bit error rate in OCDMA system based on the new 2-D modified double weight (MDW) OCDMA code.
Download or read book Development of New Two Di emsional FCC MDW Code with Wavelength time Scheme in Optical Code Division Multiple Access OCDMA Network Systems written by Nui Din Keraf and published by . This book was released on 2017 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: The scope of this study involves with the capability of 2-D code by using W/T methods to suppress the influence of the MAI effect in the incoherent SAC-OCDMA system. A number of studies have examined the relationship between the MAI effect and the degradation of system bit error rate (BER) (Shiraz & Karbassian, 2012; Yin & Richardson, 2007). This newly proposed 2-D signature code can be obtained by combining of 1-D MDW (Aljunid et. al., 2004) and 1-D FCC (Rashidi, Aljunid, Ghani, Fadhil, Anuar, & Arief, 2014) codes known as 2-D FCC-MDW. The scheme used is based on wavelength and time encoding decoding process. Each user will be assigned a hybrid signature code where the optical pulses will be first encoded in the wavelength domain using MDW code scheme and later the FCC code will be encoded in the time domain. The serious issues to deal with when designing the code in OCDMA system with satisfactory performance is that the correlation properties and the number of users can be supported (Chen, 2007). Hence, to demonstrate the potential of this approach and its suitability for the application, the mathematical derivation is investigated. A simulation which uses OPTISYS simulation software Version 7.0 used to simulate the data which practically replicate a real system. The comparison will be carried out between the theoretical (mathematical analysis) and simulation data. In order to verify the analytical methods, all the mathematical development based on 2-D FCC-MDW code will be compared with the existing similar structured 2-D codes.
Download or read book Design and Implementation of an Optical Code Division Multiple Access System Combined with Dense Wavelength Division Multiplexing written by Yongjun Zhang and published by Cuvillier Verlag. This book was released on 2003 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 2 D Wavelength time MDW Code Optimization for Cardinality Enhancement in OCDMA System written by Amy Azura Mohamad Saufe and published by . This book was released on 2018 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research work focused on the investigation of 2-D MDW code by using OCDMA technique. The development of the suggested codes was focusing on incoherent W/T coding based on the matrix combination way. This code is the evolution from one-dimensional (1-D) MDW code. The code with the mathematical calculation is in matrix system. The row is for the number of user and the column is for temporal code length. Nevertheless, this system also wants to overcome the noise for example shot noise, thermal noise and phase-induce intensity noise in term of deterioration of BER. The results are only based on the simulation and theory. All the simulation part was done by using the optical simulator Optical Communication System Design Software or Optisystem Version 7.0 from Optiwave.
Download or read book Analysis and Implementation of a Two dimensional Bipolar Wavelength time Optical Code division Multiple access System written by Luay Thomas and published by . This book was released on 2006 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In recent years, there has been an increasing demand for high-performance networks to support emerging technologies, new applications, and innovative communication services. Optical code division multiple-access (OCDMA) has been proposed as a network solution offering flexible access to high-bandwidth applications while supporting different levels of quality of service. In this thesis, we provide the first demonstration of successful encoding and decoding of two-dimensional wavelength-time (2D lambda-t) OCDMA bipolar codes. Furthermore, we develop a generic simulation platform for investigating the impact of component mismatch, caused by wavelength and/or time misalignments in the optical encoders/decoders or misbalance in the photodetectors, on the bit error rate (BER) system performance of 2D lambda-t bipolar OCDMA systems. In particular we apply the simulation model to compare the performance of various 2D lambda-t bipolar codes." --
Download or read book Investigation of Coherent Spectral and Incoherent Wavelength time Optical Code Division Multiple Access O CDMA Systems written by Vincent Jose Hernandez and published by . This book was released on 2007 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Realization of Wavelength time Modified Double Weight Codes Optical Code Division Multiple Access System written by Amir Razif Arief and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1997 with total page 1860 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development and Implemention of a Novel Code Family for Optical Code Divison Multiple Access System written by Syed Alwee Aljunid Syed Junid and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Future telecommunication systems and networks are expected to provide a variety of integrated broadband services to the customers. There has been a tremendous interest in applying Code Division Multiple Access (CDMA) techniques to fiber optic cOmIDunication systems. This technique is one of the multiple access schemes that is becoming popular because of the flexibility in the allocation of channels, ability to operate asynchronously, enhanced privacy and increased capacity in bursty networks. The performance of any Optical CDMA (OCDMA) system strongly depends on the codes properties. In this study we introduce a new code for Optical CDMA namely Double Weight Code family (DW). Double Weight Code (DW) has a basic fixed weight of 2 and exists for every natural number. The DW codes possess ideal cross correlation properties, which have important characteristics in OCDMA systems since these can eliminate multiple access interference (MAl) and reduce noise. Also proposed in this study, a Modified Double-Wei~ht (MDW) code, which is a variation ofDW code family that can have a variable weight greater than two. The MDW code possesses ideal cross¬correlation properties alid exists for every natural number too. It is shown through simulations, theoretical analysis and partially by the experiments that the transmission performance of DW code family is significantly better than that of existing codes such as Modified Frequency Hopping code (MFH) and Hadamard code. The performance of DW code family, MFH and Hadamard codes were simulated using commercial simulation software, OptiSystem Version 3.0. The performance of the systems was characterized by referring to the bit error rate (BER) and the eye patterns. DW code family has shown superior performance compared to other OCDMA codes. The simulated eye pattern of one of the four MDW coded carriers running at 10Gbps over a communication-standard fiber shows a good quality transmission at the BER of 10-12 as opposed to only Hr3 and 10-4 for Hadamard and MFH codes. In optical CDMA systems, the detection process affects the design of transmitters and receivers. Cross-correlation functions are generated which creates Multiple Access Interference (MAl) and this will degrade the system performance. MAl can be reduced by using subtraction techniques. The most common subtraction technique is the complementary subtraction technique and also known as balanced detection technique. In this thesis, we also introduce a new approach called AND subtraction technique. This method rejects unwanted signals that interfere with the original signals. Furthermore, the purpose of this new subtraction technique is to reduce the receiver complexity and increase system performance. It has been shown through theoretical analysis, simulation and experimental work, the performance of the system with AND subtraction technique can be improved significantly. Based on the theoretical analysis, BER as good as 10-12 is achieved at the bit rate of 622 Mbps over 70 kIn distance.
Download or read book Optical Code division Multiple Access Networks Quantifying and Achieving the Ultimate Performance written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applications of Perfect Difference Codes in Fiber optics and Wireless Optical Code division Multiplexing Multiple access Systems written by Fahim Aziz Umrani and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multi wavelength Optical Code division multiple access Communication Systems written by Cedric Fung Lam and published by . This book was released on 1999 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
