  The wireless communication systems has gone from different generations from
SISO systems to MIMO systems. Bandwidth is one important constraint in wireless
communication. In wireless communication, high data transmission rates are
essential for the services like tripple play i.e. data, voice and video. At
user end the capacity determines the quality of the communication systems. This
paper aims to compare the different RF wireless communication systems like
SISO, MISO, SIMO and MIMO systems on the capacity basis and explaining the
concept as today, the wireless communication has evolved from 2G, 3G to 4G and
the companies are fighting to create networks with more and more capacity so
that data rates can be increased and customers can be benefitted more. The
ultimate goal of wireless communication systems is to create a global personal
and multimedia communication without any capacity issues.
