عنوان البحث(Papers / Research Title)
Wireless communication system
الناشر \ المحرر \ الكاتب (Author / Editor / Publisher)
ستار بدر سدخان المالكي
Citation Information
ستار,بدر,سدخان,المالكي ,Wireless communication system , Time 6/12/2011 7:07:36 AM : كلية تكنولوجيا المعلومات
وصف الابستركت (Abstract)
Wireless communication system
الوصف الكامل (Full Abstract)
Wireless communication system based on GMSK modulation scheme
SATTAR B. SADKHAN (*), NIDAA A. ABBAS (*), M. HUTAHIT (**)
SUMMARY. –
To investigate the techniques for occupying less bandwidth and power for a given probability of error, a closer study of transmission techniques are explored during this work in order to determine a suitable modulation technique for a particular wireless application. A mobile communication system is modeled and simulated using GSM standards, including the Gaussian Minimum Shift Keying (GMSK) modulation scheme and a Gaussian fi lter of bandwidth – symbol duration product of 0.3, with a carrier frequency of 900 MHz. The effect of Raleigh fading is studied and simulated using a model based on a spectral analysis of the fading envelope. The Probability of error in the received signal is used in the comparison between various systems, by calculating an appropriate level of noise for particular signal strength. Simulation work has been done using MATLAB software package.
Key words: Digital Communication System, GMSK, Wireless Communication, Cellularsystem, Computer Simulation, Raleigh Fading Channel.
INTRODUCTION:-
There are a number of factors that infl uence the choice of a modulation scheme for use in a wireless communication. The performance of a mobile communication system is dependent on the effi ciency of the used modulation method. Linear and constant envelope modulation techniques, such as BPSK, QPSK, GMSK, etc…, were used to examine the features of the required modulation scheme, and to illustrate their use in the cellular environments. The goal of a modulation technique is not only to transport message signal through a radio channel, but also to achieve this with the best quality, power effi ciency, and with the least possible amount of bandwidth (1).
(*) University of Babylon, Iraq; e-mail: drengsattar@ieee.org, nidaa_muhsin@ieee.org(**) Ministry of Science and Technology, Iraq; e-mail: maha1972@yahoo.com
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