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Article
Design and Implementation of Optical Wireless Communication System

Author: Saba A. Shukry
Journal: Al-Fatih journal مجلة الفتح ISSN: 87521996 Year: 2005 Volume: 1 Issue: 23 Pages: 100-110
Publisher: Diyala University جامعة ديالى

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Abstract

In this paper, we have designed and constructed an optical communication system to transmit two-voice channel full duplex technique with line of sight, which uses a laser beam as a carrier wave in free space. The constructed system consists of a tranciever (transmitter and receiver ) for both sides. The transmitter part includes a laser source and other transmitter accessories as well as a receiver component. Pulse code modulation (PCM) technique has been used to transmit voice signal. High quality sound communication link for a distance reaching about 1300m is achieved with signal to noise ratio (S/N) equal to 21.1 d

تم في هذا البحث تصميم وبناء منظومة اتصالات ضوئية رقمية لنقل قناتين صوتية بأتجاهين متعاكسين بوقت واحد بتقنية الإرسال الآني مع تأمين خط النظر تعمل باستخدام أشعة الليزر كوسط ناقل للمعلومات في الفضاء الحر.ان بناء منظومة الاتصالات الضوئية تضمنت بوردين الكترونيين يحتوي كل بورد على وحدة ارسال واستقبال ، وباستخدام تقنية التضمين النبضي المشفر PCM لنقل قناة صوتية يتراوح ترددها بين 0.3 – 4 kHz ومعدل نقل البيانات الرقمية لهذه المنظومة 100kbps باستخدام تقنية توشير اللاعودة الى الصفر لقد تم تحقيق حلقة اتصال صوتية بوقت واحد وبوضوح عالي الدقة وعلى مديات وصلت الى مسافة 1300 m وتم حساب نسبة الإشارة إلى الضوضاء S/N فوجد انها تساوي (21.1dB) .


Article
Position Control of Solar Panel Receiver by Joint Generated Power and Received Signal Power Maximization

Author: Bassam Fadel Mohammed
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2018 Volume: 25 Issue: 3 Pages: 24-29
Publisher: Tikrit University جامعة تكريت

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Abstract

The use of solar cells as photodetectors in Optical Wireless Communications (OWC) systems, is acquiring an increasing attention. This is due to the fact that a solar cell can detect an incident optical signal without the need to be biased by an external dc source, unlike traditional photodetectors. Basically, solar cells are designed to be used in solar energy harvesting systems. However, the solar cells are used during the day time and they remain idle at night. Then, they can be used in other applications, such as optical signal detection during night hours. Moreover, the efficiency of solar systems and solar receivers can be maximized by using dual axis light source tracking, to keep the cell orientation at the direction that results in the maximum electrical output. Therefore, in this paper, a solar cell positioning algorithm is proposed to track the maximum power point of both of the sun at day time and the optical communication signal at night. The proposed system can automatically distinguish between its two operation modes and then provides the necessary control. The proposed system is implemented and tested under realistic outdoor environment. It showed an accurate detection of the operation situation and also an accurate and smooth positioning during the specific operation mode. The measurement of the generated and consumed power by the designed system has emphasized it feasibility.

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