A Simulation Study of Interference and SIR in Integrated Voice/Data Wireless DS-CDMA Networks

Abstract

The objective of this paper is to characterize the multiple access interference in a DS-CDMA integrated voice/data wireless network. The simulation model is designed for stream-based services and, consequently, accommodates voice calls and data calls of the long file transfer type. Our simulation results characterize a short term variation of uplink interference power. A key quantity that we investigate is the distribution of the cumulative instantaneous interference power. Another measure thai we study is the fluctuation of the signal-to-interference ratio (SIR) at the base station. We also evaluate the SIR statistics in terms of cumulative distribution functions. Studies of this type are important for capacity enhancement in DS-CDMA wireless networks as they can lead to multiple access interference models that can be effectively employed in bandwidth management systems and in interference estimator-canceller algorithms.