Capacity analysis of an integrated voice/data DS-CDMA network

Abstract

This paper proposes a packetized direct sequence code division multiple access (DS-CDMA) system model that supports integrated voice and data traffic in a slowly Rayleigh fading environment and allows for seamless interfacing to an asynchronous transfer mode (ATM) broadband network. Forward error correction (FEC) coding and an automatic retransmission request (ARQ) protocol are applied to data packets. A queueing model is used for servicing data transmission requests. The reverse link power control utilizes a closed loop algorithm with channel estimation. A one-bit power control command is used for delay insensitive data packets and a two-bit command for delay sensitive voice packets. The cell capacity for data users is analyzed and is extended to include voice users by assigning a fixed number of DS-CDMA channels for data traffic and using all the remaining resources for voice traffic. It is shown that there is a linear relation between the capacity for data users and that for voice users.