Capacity evaluation of spread spectrum multiple access

Abstract

This paper investigates the capacity of spread spectrum multiple access (SSMA) in a non-cellular environment under additive white Gaussian noise (AWGN) conditions. A theoretical system model is proposed that allows one to evaluate such a system. The probability density function of the average degradation due to the interuser interference is determined by simulations and the validity of approximating the interuser interference as a Gaussian random variable is verified. The capacity of SSMA is shown to be low compared to TDMA when operated in a non-cellular environment without forward error control (FEC) coding.<>