البحث — المستودع الرقمي العراقي

المستخلص: In a step to overcome the limitations of sensor based solar tracking system, a design tracking strategy, is presented in this thesis which is based on astronomical equations. This strategy takes two important factors into consideration. The first is finding the more accurate equations and figure out the ability of implementing such system which can deal with these complicated equations that are based mainly on trigonometric functions. The second is how to design and build a reliable, uninterrupted, accurate and global system that is able to calculate the local time, date and location in terms of longitude and latitude.This thesis aims to design and implement practically a global dual axis solar tracker that can process the data with high efficiency, able to solve these complicated equations, gather the required data from the GPS card, then save, and manage them inaccurate with tracking efficiency up to 99.33%, increases the power production by over 40%, reduce the drive power requirement 31%, reliable and uninterrupted with real time controller.The system also presents a design for a hybrid network for a solar tracking farm consisting of N - solar tracking systems. A main control unit is presented to manage all the trackers to the sun location in multi - tracking mode, diagnosis all the trackers for any faults and give complete information about the produced power from each of the solar tracking system. A new network protocol is designed to deal with the error control, congestion control and flow control for data transmission in the network.A complete solution for power - line communication modem has been proposed based on existing power line characteristics. This modem has advantages of simplicity, cost effectiveness and using new strategy to control the out of reach devices without increasing the transmitting power or changing the circuit specifications. The proposed design offers a simple solution to control the solar trackers in a vast solar farm, enabling to monitor the supplied power by each single tracker in the field and having the ability of fault diagnosis.

خوارزميات جديدة لفك ترميز المرمزات (TCM TTCM &) لانظمة الجيل الرابع اللاسلكية == New Non - Binary TCM And TTCM Decoding Algorithms For 4G Wireless Systems

اسم المؤلف: رياض علي عبد الحسين الهلالي

اسم المشرف: Raad H. Thaher | Abdulkareem S. Abdullah

الموضوع العام: هندسة الكهرباء والالكترون والاتصالات

السنة: 2013

الموضوع الدقيق: هندسة الالكترونيك والاتصالات

الدرجة: ماجستير

الجامعة: جامعة البصرة - كلية الهندسة

اللغة: الانكليزية

مكان الجامعة: البصرة

الصفحات الاولى:

بحث في ادراك البيئة المعرفية الراديوية في نظم الاتصالات اللاسلكية == An Investigation For Context - Aware In Cognitive Radio Communication Systems

اسم المؤلف: احمد صبري كاظم

اسم المشرف: Haider M. AlSabbagh