An analysis of the effects of multiple access interference in DS-CDMA reverse link

Abstract

Multiple access interference (MAI) is the most significant limiting factor on the capacity of the conventional DS-CDMA systems. In this paper an analysis of the character of MAI is carried out. The main causes of intra-cell MAI and their effects on the system are highlighted through simulation and analysis. A considerable research effort in the development of efficient multiple user detection (MUD) techniques is in progress, however no concrete analysis of MAI and its character modeling is found in the literature. In aim paper numerous factors which result in MAI enhancement like asynchronous reverse channel, semi-orthogonal long PN codes and increase in users are analyzed. This quantification of MAI character result in its clearer understanding and leads to a more realistic and efficient MOD algorithms