A new approach to reduce multi-access interference in DS-CDMA

Abstract

Direct Sequence Code Division Multiple Access (DSCDMA) is mainly an interference limited channel. When several users are accessed in a common channel and since signature sequences assigned to users are not perfectly orthogonal, so interference is introduced in each user's desired signal. Several interference cancellation methods were proposed to reduce multi-access interference. In this paper, we propose a new method in which a correlation matrix is calculated and then performs some procedures to reduce this interference. To reduce this interference further, multistage scheme can be introduced. We also deal with memory allocation mapping to support this whole interference reduction method.