Abstract:
َََََThe mobile communications systems designed according to the theory of studying depends on several parameters such as adjustable or imposed values, the cell coverage area depends on the transmit and received power, path loss and shadowing , which affects at the received signal.َThe growth of urban area and environment changing will affect to antenna performance, this growth will increase the path loss and shadowing which leads to decrease the cell coverage area. In this thesis a sample of readings has been collected at several points, in the Riyadh region (middle of Khartoum) at the frequency 415 MHz, then the path loss exponent γ was calculated and it’s achieved value height 1 meter = 4.7989 and at high (3.5 meters) = 4.326, and the shadow factor was also calculated and it’s achieved value at height 1 meter = 6.72 and at height 3.5 meters = 5.675. Then the Simplified Path Loss Model for was plotted, readings and calculated values was Analyzed. Finally, the percentage of the cell coverage area was founded, and it is equal to 8َ..7% at the height of 1 meter and 4َ4% at the height 3.5 meters.
