Efficient Design Procedure of Microstatistic Multi-user Detector for Nonlinearly Distorted MC-CDMA

Abstract

Multi-carrier code division multiple access (MC-CDMA) is a powerful modulation technique that is being considered in many emerging broadband communication systems. MC-CDMA systems based on OFDM are high sensitive to nonlinear amplification what results in inefficient use of power amplifiers. In a microstatistic MUD (MSF-MUD) has been proposed for performance improvement of MC-CDMA degraded by nonlinear amplifiers. In this paper, a new efficient design procedure of MSF-MUD for nonlinearly distorted symbols of MC-CDMA based on M-symbol QAM modulation is proposed. This method is based on the analysis and change tracking of the M-symbol QAM signal constellations of non-distorted and nonlinearly distorted MC-CDMA symbols by using a training sequence. The results obtained in this paper confirm, that the MSF-MUD clearly overcomes a linear MUD at the outlined scenario whereas MSF-MUD designed by the new method described in this paper is able to provide almost the same performance than that of optimum MSF-MUD.