Conception et implémentation d’un système de communication optique sans fil en intérieur

Abstract

حشهذ فٍانط اكخظبظ إنى ذٌخضاًان ىًُان هزا أفضى ولذ .شهبٍوغ ؼبصشةًان خبحفًوان ،ٍسبكًوان ،بثٍسخشفًوان ،تٍانزك ٌذًان ًف (OWC) تٍانالسهك تٍانضىئ االحصبالث ّؼذُح ،بقٍانس هزا ًوف .ذةٌخذ تٌحشدد طبلبثَ ٍػ انبحث سخىخبٌ بًي ،ىيٌانشاد تٍاإلشكبن ِنهز ًبنتّوفؼ ًتًيالئ ً . اسخدببت. ئبثٍنهب يخصص تٍالسهك تٍضىئ احصبالث ظبوَ كٍوححم ىًٍحص مخشذَ ،بسخشًان شهبدة مٍُن وَّمذًُ ان ششوعًان هزا إطبس ًف م ،تٍانذاخه ّ ًضىئ سخمبمًك ًسًش نىذ ظبوُان هزا ًف سخخذوٌُ ثٍح .تٍانطب ؼهىيبثًان ظبوُن تٍاألسبس ىاةُان ظبوُان هزا ثًٌُ ,(On-Off Keying, OOK) مبفٌواإل مٍانخشغ : مٌحؼذ ًَخٍُحم ػهى دضًُُ ان ىرجًُان ذًؼخٌ .تٍانطب بثَبٍانب السخمببل -صذسًان ضٍحشي ًَأسهىب ٍػ ًفضال ،) Pulse Position Modulation, PPM) بضتُان ىضغًب مٌوانخؼذ ،شسخشَيب ضٍوحشي) Non Return to Zero, NRZ) انصفش إنى انؼىدة ػذو ضٍحشي ٍي شةٍانكب األحدبو يغ نهخؼبيم)Discrete Cosine Transform, DCT) بثَبٍانب ضغظ تٍخىاسصي بَخب إنى .ؼهىيبثًان ٍي شةٍانكب األحدبو بثَبٍانب وضغظ شسخشَيب ضٍوحشي PPMمٌحؼذ ٍٍب غًاند ٌأ كَّحمًُ ان ىرجًُان أداء ىٍٍحم أثبج ولذ .االسخدببت ٍوصي اإلسسبل خىدة ثٍح ٍي خبئحُان أفضم حمكٌ DCTخمطغًان بوًانخ بٍخ مٌححى بىاسطت ؼهىيبثًان . OWC, LiFi, VLC, OOK, PPM, DCT المفتاحية الكلمات Abstract Telecommunications technologies are experiencing sustained expansion, particularly with the development of wireless communications and connected objects deployed in smart cities, hospitals, homes, contemporary museums, and so on. This growth is leading to saturation of the radio spectrum and necessitates the search for new frequency bands. Optical wireless communication (OWC) offers a relevant solution to this problem. In this final-year project, we propose the design and implementation of an optical wireless communication system for an indoor environment. This system forms the transmission core of a medical information system. A photovoltaic cell is used as a receiver for collecting medical data. The prototype implements two modulation techniques—On-Off Keying (OOK) and Pulse Position Modulation (PPM)—as well as two source coding schemes, No Return to Zero (NRZ) and Manchester, along with a compression method for large data volumes. The evaluation of the prototype's performance shows that the combination of PPM modulation, Manchester coding and discrete cosine transform (DCT) compression offers the best performance in terms of transmission quality and latency. Keywords: OWC, LiFi, VLC, OOK, PPM, DCT