SPECTRAL AMPLITUDE CODING OPTICAL CODE DIVISION MULTIPLE ACCESS SYSTEM ON HIGH-SPEED DATA RATE

Presentation on M Tech Dissertation Part 1 Progress Work

Presented By:

SACHIN KUMAR (12/PIT/080)

Supervised By:

Dr. Rajesh Mishra

Content

INTRODUCTION INTRODUCTION

SPECTRAL AMPLITUDE CODING OPTICALCODE DIVISION MULTIPLE ACCESS

LITERATURE SURVEY

REFERENCES

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Introduction

• In CDMA, a unique code is assigned to each subscriber. These codes are designed to allow all users to transmit data simultaneously and asynchronously

• Optical code division multiple access (OCDMA) technique, which allows multiple users share the same transmission media by assigning different optical codes (OCs) to different users, is an attractive candidate for next generation broadband access networks.

• The key advantage of using OCDMA is that, OCDMA can be encoded and decoded in optical domain without converting the signal to electronic unless it needed to be. In OCDMA, the multi user interference (MUI) is the ultimate limit in system performance. MUI increases with the number of simultaneous users and severely limits the capacity of the system. There are two types of O-CDMA Techniques:-

O-CDMA with Unipolar Codes

O-CDMA with Bipolar Codes

O-CDMA with Unipolar Codes O-CDMA with Unipolar Codes

Elecrical Encoder

Pattern Generator

Elecrical Decoder

Optical DecoderNetworkData

Pattern

Detect Pattern

Outer ChannelOuter ChannelInner Channel

Data

An Optical Pattern

Corrupted Pattern

Fig. An optical CDMA network using two-dimensional codes

O-CDMA with Bipolar Codes O-CDMA with Bipolar Codes

SPECTRAL AMPLITUDE CODING OPTICALSPECTRAL AMPLITUDE CODING OPTICALCODE DIVISION MULTIPLE ACCESSCODE DIVISION MULTIPLE ACCESS

• The spectral amplitude coding (SAC) OCDMA systems have attracted much attention because the multi-access interference (MAI) can in theory be removed when using code with fixed in phase cross-correlation.

• The spectral amplitude coding (SAC) OCDMA systems have attracted much attention because the multi-access interference (MAI) can in theory be removed when using code with fixed in phase cross-correlation . Codes for OCDMA systems employing intensity detection have to be unipolar, orthogonal (minimum cross-correlation) and constant weight to obtain low values of probability of error owing to MAI. Hence, a family of codes called optical orthogonal codes (OOCs) has been designed. Which improves the system performance and increases the number of simultaneous users by code design.

Timeline Plan of the Proposed Research Timeline Plan of the Proposed Research

Literature Survey Literature Survey

Base paper- Abd T. , Aljunid S., Fadhil H. , Ahmad R. and M.A. Rashid, New approach for evaluation of the performance of spectral amplitude coding-optical code division multiple access system on high-speed data rate.

•In this paper author proposed the system performance of spectral amplitude coding optical code division multiple access (SAC-OCDMA) systems.

•The system performance is evaluated based on a new code called the dynamic cyclic shift (DCS) code algorithm.•Performance of the DCS code on high-speed OCDMA systems can be evaluated by using both the numerical computation as well as the simulation experiment.

Research GapsResearch Gaps

• The system performance is evaluated based on a new code called the dynamic cyclic shift (DCS) code.

• The DCS code reject the MAI noise, and the number of users could be doubled. It will not applicable for 3D next-generation OCDMA networks

Literature Survey: ObservationsLiterature Survey: Observations

• AL-KHAFAJI H. , ALJUNID S. , Amphawan A., A. Fadhil H., M. Safar A. , Reducing BER of spectral-amplitude coding optical code-division multiple-access systems by single photodiode detection technique., Opt. Soc. Rap. Public. 8 pub. 2 J. Europ. Opt. Soc. Rap. Public. 8, 13022 (2013) 013.

• In this paper author proposed the system performance of spectral amplitude coding optical code division multiple access (SAC-OCDMA) systems.

• The system performance is evaluated based on a new code called the dynamic cyclic shift (DCS) code algorithm.

• Performance of the DCS code on high-speed OCDMA systems can be evaluated by using both the numerical computation as well as the simulation experiment.

Research GapsResearch Gaps

• The DCS code reject the MAI noise, and the number of users could be doubled. It will not applicable for 3D next-generation OCDMA networks

ReferencesReferences

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