| Titre : | Spectral Amplitude coding for optical FSO / CDMA systems |
| Auteurs : | Mr. Bouarfa Abdelkader, Directeur de thèse ; HACHEMAOUI YACINE ZINE EDDINE, Auteur ; ZOUANI BRAHIM KHALIL, Auteur |
| Type de document : | texte imprimé |
| Editeur : | univ DR taher moulay saida, 2020 |
| Format : | 70 p / ill / 29 cm |
| Accompagnement : | CD ROM |
| Note générale : | Bibliographie |
| Langues: | Français |
| Mots-clés: | Electronique |
| Résumé : |
Free space optics is a promising communication technology in the near future, due to the atmospheric disturbances there is distortion of signal at the receiver. This presentation gave an overview Our study on the evaluation of the performances of the SAC-OCDMA system with OR detection in FSO, using the MDEU (Modified Diagonal Eigen-value Unity) codes, that become cyclic and study the performance of this new system In the first chapter, we focused on different notions of multiplexing and multiple access techniques used in optical communications systems, as well as OCDMA Coding Techniques. In the second chapter, we have based on the principle of spectral amplitude coding, the different detection techniques as well as the noise generated by the system, In chapter three we discussed the unipolar codes families used in OCDMA and MDEU codes were presented, and MDEU codes were further detailed. In the last chapter, the simulation of an SAC-OCDMA in FSO chain was carried out for 4 active users where MDEU codes were used under software optisystem 7.0 with a bit rate of 622 Mbit / s. The results obtained, in terms of BER and eye diagram, allowed us to confirm the impact resulting from multiple access interferences. The work is completed by optimizing the number of users in a SAC-OCDMA system while preserving a good quality of communication, which is resistant to the various disturbances caused by multiple access interferences. |
| Note de contenu : |
CHAPTER I: Introduction to wireless optical telecommunications networks CHAPTER II : OCDMA Optical Distribustion Access Techniques Chapter III : One Dimensional Codes Used in SACOCDMA System Chapter IV : Simulation of an Optical System SACOCDMA Using MDEU Code |
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| Code-barres | Cote | Support | Localisation | Section | Disponibilité |
|---|---|---|---|---|---|
| TECT06168 | T.EN.MS00481 | Périodique | Ouvrages | 28 | Libre accès Disponible |
