MAI statistics estimation and analysis in a DS-CDMA system

Sustainable Buildings and Cities

土木建筑工程

Alami Hassani, A.^1 ; Zouak, M.^2 ; Mrabti, M.^3 ; Abdi, F.^2

Systems and Sustainable Environment Laboratory (SED), Private University of Fez, UPF, Fez, Morocco^1

Signal Systems and Components Laboratory (SSC), Faculty of Sciences and Techniques, USMBA, Fez, Morocco^2

Laboratory of Computing and Interdisciplinary Physics (LIPI), Ecole Normale Supérieure, USMBA, Fez, Morocco^3

关键词: CDMA transmission;    Direct sequence code division multiple access;    Gaussian random variable;    Link performance;    Multiuser environments;    Multiuser system;    Probability density function (pdf);    Statistical modeling;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/353/1/012026/pdf
DOI  :  10.1088/1757-899X/353/1/012026

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

A primary limitation of Direct Sequence Code Division Multiple Access DS-CDMA link performance and system capacity is multiple access interference (MAI). To examine the performance of CDMA systems in the presence of MAI, i.e., in a multiuser environment, several works assumed that the interference can be approximated by a Gaussian random variable. In this paper, we first develop a new and simple approach to characterize the MAI in a multiuser system. In addition to statistically quantifying the MAI power, the paper also proposes a statistical model for both variance and mean of the MAI for synchronous and asynchronous CDMA transmission. We show that the MAI probability density function (PDF) is Gaussian for the equal-received-energy case and validate it by computer simulations.