Forward-link capacity of a DS/CDMA system with mixed multirate sources

Some studies have been done on capacity of a code division multiple access (CDMA) system with mixed multirate sources, However, a vast majority of the se studies have concentrated on the reverse link. This trend comes from the fact that the capacity of a CDMA system is reverse-link limited. However, forward link can be a limiting link because emerging data services are like ly to require higher data rates in the forward link than in the reverse lin k, In this paper, we analyze and simulate the forward-link capacity of a CD MA system with mixed multirate sources in a multipath fading channel, The o utage probability of the forward link is derived for a CDMA system with mix ed multirate sources. By introducing a forward-link power factor, the forwa rd-link Erlang capacity is obtained in a closed form. The forward-link capa city is analyzed in terms of the number of multipaths, the number of rake f ingers in a mobile station, closed-loop power control, and impact of soft h andoff, The results in this paper can be applied to overall system design o f a CDMA system with multimedia services in future mobile communication sys tems.