Title :
Dynamic System Analysis and Generalized Optimal Code Assignment of OVSF-CDMA Systems
Author :
Gong, Dian ; Li, Yunfan
Author_Institution :
Dept. of Electr. Eng., Univ. of California, Riverside, CA
Abstract :
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.
Keywords :
code division multiple access; multimedia communication; orthogonal codes; Markov model; OVSF-CDMA systems; dynamic system analysis; generalized optimal code assignment; orthogonal variable spreading factor-code division multiple access; Aggregates; Communications Society; Control systems; Multiaccess communication; Multimedia communication; Multimedia systems; Radio control; Radio frequency; Testing; Wireless communication;
Conference_Titel :
Communications, 2008. ICC '08. IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2075-9
Electronic_ISBN :
978-1-4244-2075-9
DOI :
10.1109/ICC.2008.894
