AbstrakHAPS (High Altitude Platform Station) is an alternative technology to an existing
communication systems named terrestrial and satellite systems. One of the applications
that can be employed in HAPS system is cellular 5G technology. However,
interference is one of problems in achieving maximum capacity. Multispot beam and
the power control are both used to overcome the problem. This multispot beam antenna
works like a base station on a terrestrial system. The multispot beam antenna lies at a
close distance on the platform. Thus the path passed by the signal of each user has a
nearly equal length of trajectory. Almost the same trajectory causes the shadowing
experienced by each user almost the same value. This is in contrast to the terrestrial
system in which each user gets the power control of the BTS residing in each cell. The
length of the path taken by each user's signal is different so the shadowing value is also
different.This paper aims at evaluating the capacity of 5G cellular in single HAPS
system in which the bandwidths used are 0.1 GHz and 1 GHz. Simulation result shows
that outage probability using 0.1 GHz bandwidth resulting the capacity in single HAPS
system, which is maksimum 550 users in reference cell can achive 10-15 and it also
happen when using 1 GHz with maksimum 5500 users in reference cell.
