Dynamic System Analysis and Generalized Optimal Code Assignment of OVSF-CDMA Systems

OVSF-CDMA systems reallocate user codes when new calls arrive. To reduce code blocking due to new user codes, Generalized Optimal Right First Dynamic Code Assignment (GRFDCA) is brought up. GRFDCA keeps OVSF code trees in optimal right first (RF) states with respect to the number- topology (NT) count. Dynamic model of OVSF-CDMA systems is established. Tests of hypothesis about the Markovity of arrival processes are set up. Based on the Markovity assumption, continuous time Markov model of OVSF-CDMA systems is presented. By introducing absorbing states, phase type (PH) model is applied. Dynamic properties of OVSF-CDMA systems are analyzed based on PH model. Simulations and further discussions based on the dynamic model are presented.