Optical cdma and tdma
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This document discusses optical time division multiple access (OTDMA) and optical code division multiple access (OCDMA). OTDMA allows multiple optical signals to be combined into a single data stream by performing time division multiplexing. OCDMA transmits data using light pulses encoded with unique codes, allowing all users to transmit over the full bandwidth simultaneously. The document outlines the implementation of OTDMA and OCDMA, and compares their advantages and disadvantages. OTDMA provides higher bit rates but subjects signals to multipath distortion, while OCDMA does not require time or frequency management but has more expensive encoding/decoding hardware.
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TDMA and CDMA are digital communication techniques used in wireless networks. TDMA divides time into discrete slots and assigns each user a time slot to transmit and receive on the same frequency channel. CDMA assigns each user a unique code and allows multiple signals to be transmitted simultaneously over the same frequency band. Both techniques improve spectrum efficiency and enable more users to access the network, with TDMA optimizing time allocation and CDMA optimizing code allocation.
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OFDM-5.ppt
This document discusses the implementation of OFDM and MC-CDMA modulation techniques using MATLAB. It motivates their use for high data rate applications and in 4G networks. The objectives are to simulate an OFDM baseband system for file transfer between computers, model wireless fading channels, and demonstrate multi-user capability with MC-CDMA. Key aspects covered include the advantages of OFDM, its methodology, understanding multipath effects, equalization in the frequency domain, and the MC-CDMA transmitter and receiver design. The implementation environment uses MATLAB with modular designs for the modulator, channel, equalizer and MC-CDMA modules. Results shown include constellation diagrams and BER performance curves.
IRJET- Review on Multiple Access Techniques used in Mobile Telecommunication ...
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4G Mobile Network & Applications
I use this presentation for opening 4G Mobile Technology seminar sessions. Usually it will be continued with 1 other presentation on LTE, 1 on WiMAX II, and 1 on applications.
Gsm (1)
Global System for Mobile Communication (GSM) is a 2G digital cellular network standard that became the world's leading standard for mobile communications. GSM uses TDMA multiple access to allow multiple users to share the same radio frequency by dividing each radio channel into time slots. It offers advantages over 1G analog networks like increased network capacity, support for additional services beyond voice calls, and more efficient use of available spectrum.
Similar to Optical cdma and tdma (20)
Performance Analysis of Optical Code Division Multiple Access (OCDMA) System
Performance Analysis of Optical Code Division Multiple Access (OCDMA) System
Multiple access techniques for wireless communication
Multiple access techniques for wireless communication
OFDM and MC-CDMA An Implementation using MATLAB.ppt
OFDM and MC-CDMA An Implementation using MATLAB.ppt
IRJET- Review on Multiple Access Techniques used in Mobile Telecommunication ...
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Optical cdma and tdma
- 1. Presented by - Er. Kush Singla Roll No. – 192606 ME(1st Semester) , NITTTR CHD
- 2. CONTENTS Introduction Brief history about multiple access communication systems and evolution of CDMA and TDMA What is optical TDMA & CDMA and how is it implemented ? Advantages & Disadvantages References
- 3. INTRODUCTION Multiplexing – The process of combining multiple signal to single transmission link. We can also say that to accommodate more data on single channel user. Types of multiplexing : I. FDM – Frequency Division Multiplexing [oldest multiplexing technique] II. TDM – Time Division Multiplexing III. CDM – Code Division multiplexing
- 4. BRIEF HISTORY ABOUT MULTIPLE ACCESS COMMUNICATION SYSTEMS AND EVOLUTION OF CDMA & TDMA • FDMA was introduced at the time of 1st G [generation] of Mobile Communication system or Wireless Communication Systems in late 70s. • TDMA was introduced at the time of 2nd G [generation] of Wireless Communication systems in late 90s. • CDMA was introduced at the time of 3rd G [generation] of Wireless Communication systems in 2001.
- 5. WHAT OPTICAL TDMA & CDMA AND HOW IS IT IMPLEMENTED ? OTDMA Optical Time Division Multiplexing Access Time Division Multiplexing is done by passing multiple optical signals into a single data stream. Above diagram shows high bit rate multiplexed data Streams using OTDMA technique.
- 6. BLOCK DIAGRAM OF OTDMA [TRANSMISSION SIDE]
- 7. ADVANTAGES Provides higher bit rate of the order of 100Gb/s. Can be operated at both 1500nm and 1300nm. It can easily adapt to transmission of data as well as voice communication.
- 8. DISADVANTAGES The users have a predefined time slot for receiving data. It is subjected to multipath distortion.
- 9. OCDMA Optical Code Division Multiple Access It means that users share the same frequency band at the same time in the light pulse transmitted and user receives its data on the basis of multiplexed code. Here in OCDMA the data is send in the form of light pulse instead of electromagnetic waves.
- 10. BLOCK DIAGRAM OF OCDMA
- 11. ADVANTAGES It does not need any time or frequency management because all the user can transmit using the whole BW at the same time. Slot allocation problems are not needed here in contradiction to OTDMA , simple implementation using existing fibre network. Reduce the cost in aspect as security, since the data is transmitted being coded so the security of the data also increases. Provision of value added services is also available
- 12. DISADVANTAGES Since it has a lot of advantages over OFDMA , OTDMA and OWDM , burst noise (which is a type of electronic noise that occurs in semiconductors ) is observed at the receiver. Error correction is costly in OCDMA because the speed for carrying the information in electrical and optical cables is not the same. Encoding broadband and decoding hardware is expensive for OCDMA. To generate the intensity to handle an OCDMA, LED’s are not enough so it comes in LASERS where both laser array and EDFA have the required power but currently they are costly.
- 13. REFERENCES https://www.youtube.com/watch?v=TJNKoRPn-G8 https://www.slideshare.net/12012112/optical-code-division-multiple- access?qid=0255e57c-fa6b-4eea-8125- 7a2e787192a0&v=&b=&from_search=11 https://www.slideshare.net/Amandeepkaur144/optical-time-division- multiplexing https://www.google.com/search?q=optical+tdma+slide+share&newwindow= 1&safe=active&sxsrf=ACYBGNSSli_LFJQA0U_PrUCMOJAAatq3Mg:15747 89201325&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjUpMP3sojmAhW IfSsKHcXhCC4Q_AUoAXoECCsQAw&biw=1288&bih=665 https://www.slideshare.net/shadabsiddiqui7/multiplexing-tdma-fdma-cdma- wdma/8 https://www.tutorialspoint.com/gsm/tdma_and_cdma.htm https://www.facebook.com/EngineeringBuddy/posts/advantages-and- disadvantages-of-ocdmaadvantages-of-ocdma1equal-distribution-of- a/167654580048343/