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Wireless communication system based on GMSK modulation scheme

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 نداء عبد المحسن عباس العطوان
6/16/2011 4:37:12 PM
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 Wireless communication system based on GMSK modulation scheme
 
 
SATTAR B. SADKHAN 
University of Babylon Iraq
e-mail: drengsattar@ieee.org  
 NIDAA A. ABBAS
University of Babylon, Iraq
 e-mail: nidaa_muhsin@ieee.org   
 M. HUTAHIT
Ministry of Science and
Technology, Iraq
 e-mail: 
maha1972@yahoo.com 


 
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 ?  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.
 
Keywords: Digital Communication System, GMSK, Wireless Communication, Cellular system, Computer Simulation, Raleigh Fading Channel.
 
 
Introduction:

There are a number of factors that in?  uence the choice of a modulation scheme for use in a wireless communication. The performance of a mobile communication system is dependent on the ef?  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 ef?  ciency, and with the least possible amount of bandwidth (1).


  • وصف الــ Tags لهذا الموضوع
  • Digital Communication System, GMSK, Wireless Communication, Cellular system, Computer Simulation, Raleigh Fading Channel