Variable spreading gain CDMA (VSG-CDMA) technique with transmitting power control has recently been proposed to provide integrated services in a wireless packet network. System capacities of VSG-CDMA systems with and without considering user activity factors were derived based on some intuitive arguments. The analysis is imprecise because a user's transmitted power is considered part of the interference to its own signal. In this paper, we present a more precise analysis. An optimal power vector assignment and a simple criterion for all users to achieve simultaneously their quality of service, requirements (in terms of bit energy-to-interference density ratios) are derived. We found from numerical examples that, compared with the rough analysis given in , significant improvement can be obtained. An access control scheme is also studied to guarantee delay bound requirements. Simulation results reveal that more connections can be further accommodated with access control.
|Number of pages||6|
|State||Published - 1 Dec 1998|
|Event||Proceedings of the IEEE GLOBECOM 1998 - The Bridge to the Global Integration - Sydney, NSW, Aust|
Duration: 8 Nov 1998 → 12 Nov 1998
|Conference||Proceedings of the IEEE GLOBECOM 1998 - The Bridge to the Global Integration|
|City||Sydney, NSW, Aust|
|Period||8/11/98 → 12/11/98|