Juraj Gazda, Peter Drotár, Dusan Kocur, Pavol Galajda In this paper, we present a novel method for joint suppression of multiple-access interference (MAI) and nonlinear distortion introduced by high power amplifiers (HPA) in multicarrier code division multiple access (MC-CDMA) transmission system performing over frequency selective channel. The proposed method combines a proper selection of the spreading code at the transmitter side and application of the advanced microstatistic multi-user detector (MSF-MUD) at the receiver side. This scheme exploits relatively low peak-to-average power ratio (PAPR) and orthogonality of Golay codes in conjunction with MSF-MUD ability of effective suppression of MAI and nonlinear distortion. In order to have a good reference for the performance results of the proposed scheme, conventional minimum mean square error multi-user detector (MMSE-MUD) is introduced as well.
Performance improvement of MC-CDMA microstatistic multi-user detection in nonlinear fading channels using spreading code selection
As it will be shown by means of computer simulations, MSF-MUD with Golay codes employed for spreading can clearly outperform the other tested spreading codes and MMSE-MUD. The performance improvement is more remarkable, if Saleh model of HPA is employed.