Abstract :
Today's radio communication technology is capable responding the
telecommunications world challenges, this technology can handle large numbers of
customers. As the growing of mobile users, radio communication traffic increased
demanded to be more reliable. A method to improve reliability is the space diversity
technique. In this research, the effect of spacing between antennas in the network using
space diversity technique. Taken 3 sites in the South Kalimantan area. Includes design of
4 conditions, before the space diversity, after standard space diversity, minimum spacing,
and maximum spacing. The main parameters that observed is availability in minimum and
maximum spacing. The results of network above land with minimum spacing obtained
fading margin 37.13 dB and availability 99.99968%; while the maximum spacing fading
margin 37.42 dB and availability 99.99996%. Then the network above sea, minimum
spacing fading margin 28.93 dB and availability 99.7771313%; while the maximum
spacing obtained fading margin 29.25 dB and availability 99.97442%. With the
optimazation space diversity techniques on simulations, found that the reliability of the
system was increased by the small duration of the device fault within a year. The results of
network above land with minimum spacing obtained the device fault duration 100.26
seconds per year; while the maximum spacing the device’s fault duration 12.23 seconds
per year. Then the network above sea with maximum space, the possibility of device’s fault
duration 69652 seconds per year; while the maximum space for the network above the sea,
the possibility of a device's fault duration 8067.4 seconds per year.
Keywords: space diversity, space, height of antenna, availability