7984

7419

كارشناسي ارشد

مخابرات

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

1391

سيزده،95ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

حسين سعيدي، محمد جواد اميدي

7/7/92

علي محمد دوست حسيني، نغمه السادات مويديان

مهندسي برق و كامپيوتر

ID7419

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Implementation and Performance Improvement of a GSM Access Point using Software Radio Adel Eslamieh a eslamieh@ec iut ac ir Date of Submission 2013 03 11 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan Iran Degree M Sc Language Persian Supervisors Hossein Saidi hsaidi@cc iut ac ir Mohammad Javad Omidi omidi@cc iut ac ir Abstract Nowadays software radio as a new technology has a great role in advanced communication systems Using software in designing communication systems has many advantages such as decreasing the cost of implementation ease of reconfiguration and ability to use multiple standards at the same time in one platform Recent advances in increasing the process power of the processors makes development of these systems even more feasible than before In this research we developed a communication system by employing proper software and hardware tools GSM standard was used as the basic platform of the implementation due to its popularity In the proposed system first the hardware employs frequency conversion and converts the received signal into digital symbols and then appropriate software in the Linux operating system performs the necessary actions like demodulation and coding on the received signal Software can be used to perform the same procedure to the transfer signals In other words all of the baseband processing in this system is done by software Furthermore for managing the voice calls in this system a VoIP server is employed in the host computer The designed system is an access point for GSM which makes audio conversation feasible between internal subscribers Also external calls are available by using a gateway additionally a server is designed for exchanging short messages Moreover the system uses cognitive radio concept that means it can sense the energy of sub bands and choose the band with the least energy from primary users for transferring the information In addition the range of communication has been increased by deploying the proper devices The designed system can be used as a portable communication network This system can be used as a rescue system in case of emergency and it has many applications in security and emergency systems Keywords Software Radio GSM Cognitive Radio PDF created with pdfFactory trial version www pdffactory com

حسين سعيدي، محمد جواد اميدي

علي محمد دوست حسيني، نغمه السادات مويديان