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

Author

Choi, Wan ; Kim, Jin Young

Author_Institution

Res. & Dev. Div., Korea Telecom, Seoul, South Korea

Volume

50

Issue

3

fYear

2001

fDate

5/1/2001 12:00:00 AM

Firstpage

737

Lastpage

749

Abstract

Some studies have been done on capacity of a code division multiple access (CDMA) system with mixed multirate sources. However, a vast majority of these 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, the forward-link can be a limiting link because emerging data services are likely to require higher data rates in the forward-link than in the reverse-link. In this paper, we analyze and simulate the forward-link capacity of a CDMA system with mixed multirate sources in a multipath fading channel. The outage probability of the forward-link is derived for a CDMA system with mixed multirate sources. By introducing a forward-link power factor, the forward-link Erlang capacity is obtained in a closed form. The forward-link capacity is analyzed in terms of the number of multipaths, the number of RAKE fingers in a mobile station, closed-loop power control, and impact of soft handoff. The results in this paper can be applied to overall system design of a CDMA system with multimedia services in future mobile communication systems

Keywords

cellular radio; channel capacity; code division multiple access; data communication; fading channels; multimedia communication; multipath channels; multiuser channels; power control; radio links; spread spectrum communication; telecommunication control; DS/CDMA system; RAKE fingers; cellular radio; closed form capacity; closed-loop power control; code division multiple access; data services; forward-link Erlang capacity; forward-link capacity; forward-link power factor; mixed multirate sources; mobile communication systems; mobile station; multimedia services; multipath fading channel; multipaths; outage probability; reverse-link limited system capacity; soft handoff; system capacity; system design; Analytical models; Capacity planning; Fading; Fingers; Mobile communication; Multiaccess communication; Multimedia systems; Power control; Reactive power; Web and internet services;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/25.933309

Filename

933309