Theoretical Analysis of an MC-CDMA System in Cellular Environments

Abstract

By extending the scheme adopted by Chen [13], the performance of an improved cellular MC-CDMA (multi-carrier coded-division multiple-access) system for operation within a local cell, plus 12 surrounding cells in the first two tiers, is evaluated in this report. Herein, the impact of system performance with different geometrical structures of the local and the neighboring cells (the six furthest cells) is illustrated in the results from the number simulation implemented. The evaluation of error probability for an MC-CDMA system is investigated from the viewpoint of theoretical analysis, in which a working environment with both single-cell and multiple-cell configurations and correlated-Nakagami-m fading channel statistics is assumed. A joint characteristic function is applied to determine the JPDF (joint probability density function), including a generalized Laguerre polynomial. For the sake of simplicity, the difficult traditional methods for explicitly obtaining the JPDF are avoided. In this study, some new closed-form formulas for the average BER (bit error rate), with statistical calculation of MAI (multiple access interference) for an MC-CDMA system with MRC (maximal ratio combining) diversity operating in a multiple-cell environment, are also obtained.