Optical cdma tutorial pdf

Gold sequences are in useful in nonorthogonal cdma. Cellular underwater wireless optical cdma network arxiv. Advances in spectral optical codedivision multipleaccess. Basics of code division multiple access cdma spie digital library. Gsm uses narrowband time division multiple access tdma for providing voice and text based services over mobile phone networks.

Multiclass optical orthogonal codes, optical power control, and polarization encoding manuscript submitted 18. This paper simulates and analyzes noise of multimedia transmission in a flexible optical code division multiple access ocdma computer network with different quality of service qos requirements. Technique, parameters and applications rajesh yadav1, dr. Wavelength is used in optical fiber communication systems to partition channels. We consider a network in which the nodes encode their optical. Code division multiple access all users share the same radio frequency at the same time. They also have a single autocorrelation peak at zero, just like ordinary pn sequences. The technicality of cdma generation has given huge benefits over other parallel technology in terms of spectrum performance and overall performance. If the user is transmitting the data bit one, its transmitter sends codeword otherwise no signal is sent. A baseline ray trace considers only optical components in the computational domain. Interference mitigation using successive interference cancellation in optical cdma systems tawfig eltaifa, hossam m. Tutorial texts are standalone tutorials covering fundamental topics in optical science and technology at introductory and intermediate levels. To achieve multimedia transmission in ocdma, we have. Since the mid 1990s, the role of optical cdma has expanded from local area networks to longer span, telecommunicationtype networks.

Osa strategies for realizing optical cdma for dense. Audience this tutorial has been designed for readers who want to understand the basics of gsm in very. Us6236483b1 optical cdma system using subband coding. To continue with cdma we next discuss spread spectrum techniques. This poses a problem to many practicing engineers and technology managers who are unfamiliar with the relevant concepts and terminology. Tutorial on basic link budget analysis abstract advances in the stateoftheart have made wireless technology a more compelling solution for many consumer applications. Code division multiple access technique is an example of multiple access where several transmitters use a single channel to send information simultaneously.

Fibers, bragg gratings, optical amplifiers and optical switches k. Optical code division multiple access o cdma is evolving into a promising candidate for access networks, due to its potential for enhanced information security. An optical fiber communications system using spread spectrum code division multiple access techniques to achieve better bandwidth utilization. Although associated mostly with wireless cellular communication, cdma is also being considered for optical channels. To permit this without undue interference between the users, cdma. This paper won the 1st position in paper evaluation and 3rd position after presentation, ieee egyptian student.

In this paper we investigate the application of cdma in optical communication networks. Codedivision multiple access cdma is a channel access method used by various radio communication technologies. Pdf probability density function pin photodiode with a lightly doped, intrinsic, semiconductor region between the ptype and ntype regions pon passive optical network ppm pulse position modulation rs reedsolomon codes sdh synchronous digital hierarchy snr signal to noise ratio soa semiconductor optical amplifiers. Department of electronics engineering, igit, sarang, india. Code division multiple access cdma is a digital air interface standard, claiming eight to fifteen times the capacity of analog. In cdma every user uses the full available spectrum instead of getting allotted by separate frequency.

In this tutorial paperafter giving a brief listing of relevant concepts in optical. Cdma tutorial for beginners learn cdma online training. When the ray trace is complete, click the green checkmark. About the tutorial gsm tutorial gsm is a globally accepted standard for digital cellular communications. Ofa3 optical fiber communication conference ofc 2006 view. Single integrated device for optical cdma code processing. The technicality of cdma technology has given significant advantages over other parallel technologies in terms of spectrum efficiency and overall performance. Cdma appears to be an underdog for 4g, but still may win ongoing research on cdma. All optical subscriber access networks will be quite limited most of the access network is expected to be dominated by wireless. Kahn, designing highperformance multimode fibers using refractive index shape optimization, subm. Optical cdma system using prime sequence codes are analyzed. Hamarshehc aphotonics technology laboratory ptl, institute of micro engineering and nanoelectronics, universiti kebangsaan malaysia, 43600 ukm bangi, selangor, malaysia. Pdf multiaccessinterference mitigation using power.

Multiple optical private networks over epon using optical cdma technique. There are, however, a few authors that have examined the network or link layer of optical. Introduction to cdma code division multiple access cdma is a radically new concept in wireless communications. Your contribution will go a long way in helping us. Gurjitkaur2 1 school of information and communication technology, g. Tutorial on basic link budget analysis spread spectrum. Code division multiple access for wireless communications. In this paper, we present a novel optical cdma multiuser detector employing the orthogonal matching pursuit algorithm. Working with optical parameterized signals and noise bins.

Optical codedivision multiple access o cdma combines the large bandwidth of the fiber medium with the flexibility of the cdma technique to achieve highspeed connectivity. Optical code division multiple access linkedin slideshare. Optical code division multiple access o cdma is evolving into a promising candidate for access networks, due to its potential for enhanced. Cdma is much recommended for voice and data communications. Principles of communication i about the tutorial in this tutorial, the basic concepts of communications along with the important concepts of analog and digital communications have been covered. Cdma 2000 is mostly an orthogonal cdma system gold sequences have only three crosscorrelation peaks, which tend to get less important as the length of the code increases. Basic manipulation of electrical signals tutorial 4. Optical codedivision multiple access using broadband. Pdf analysis of mac protocols with correlation receiver. Pdf optical cdma detection by orthogonal matching pursuit. This allows several users to share a band of frequencies see bandwidth. Analysis of indoor wireless infrared optical cdma lan.

Cdma was originally investigated in the context of radio frequency communications systems, and was first applied to the optical domain in the mid1980s 1, 2. Analysis of mac protocols with correlation receiver for optical cdma networks part i. Pdf code for spectral amplitude coding optical cdma. Each users optical cdma decoder is matched to its intended signal. Research in this field started two decades ago or so and is still flourishing. It has gained widespread international acceptance by cellular radio system operators as an upgrade that will dramatically increase both their system capacity and the. Especially, optical code division multiple access cdma systems have been shown to be competitive candidates to support a large number of simultaneous users 112. Everything you always wanted to know about optical. Introduction to wireless communications and networks. Pdf multiple optical private networks over epon using. That is, a decibel relative to 1 milliwatt mw of power. Cdma is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel. Cellular underwater wireless optical cdma network ieee xplore. The optimal singleuser detector article pdf available in ieee communications letters 54.

Code division multiple access cdma oe and eo interfaces cannot operate above few tens of gbit s. Interference mitigation using successive interference. Code division multiple access cdma has proven to be a viable enabling technique for the. Prevention properties of optical cdma and y00 quantum stream cipher against signal alternation attacks conference paper pdf available. Seminar on optical code division multiple access submitted by murtadha ali nsaif shukur m. Pdf as spectrum spreading and cdma proved themselves as very efficient in. Single integrated device for optical cdma code processing in dualcode environment yuekai huang1, ivan glesk 1, christoph m. Wireless communication multiple access tutorialspoint. Electrical pulse shaper with mary input tutorial 5. Optical fibers contd data communication in an optical network use an optical carrier signal at some wavelength in the bandof 1450 to 1650 nm, at the source of the data, modulate the carrier with the data to be communicated, sendthe modulatedcarrier towards the destination using a path involving one or more fibers. This paper investigates optical power control to enhance capacity of optical cdma star coupled networks. Pdf effect of shiftzcc codes for optical cdma system. Analog communications 1 analog and digital signals messages are digital or analog. Chapter 7 multiple division techniques outline frequency division multiple access fdma time division multiple access tdma code division multiple access cdma comparison of fdma, tdma, and cdma walsh codes nearfar problem types of interferences analog and digital signals basic modulation techniques amplitude modulation am frequency modulation fm.

Elbadawy, performance limitations in the r3t optical random access cdma protocol, submitted for possible publication to osa j. In this tutorial paper after giving a brief listing of relevant concepts in optical communications concepts of optical spectrum spreading, techniques of temporal and spectral coding are. Cdma i about the tutorial code division multiple access cdma is a channel access method normally used by 3g radio communication technology as well as in some other technologies. This tutorial is helpful for a beginner who wants to acquire knowledge on the communication systems. Nr dimensional integral in 21 can effectively be calculated through an nt. The proposed system is compared with most of the receiver structures in the. Cdma application in optical communication seamed to be reasonable as well. Most of researches in optical cdma networks were concentrated in the physical layer. The block diagram of proposed optical cdma decoder. Digital messages are constructed with a finite number of symbols.