Joint detection for multicarrier CDMA mobile radio systems. I. System model

The combination of code division multiple access (CDMA) and multicarrier (MC) transmission techniques, termed MC-CDMA, is considered an interesting alternative to conventional DS (direct sequence)-CDMA. Therefore, recent research activities have focused on the application of MC-CDMA in mobile radio systems. The presently investigated MC-CDMA concepts explicitly avoid the occurrence of intersymbol interference (ISI), which facilitates the use of simple receivers. Unfortunately, the application of such MC-CDMA concepts cannot be recommended in outdoor environments, which are characterized by high speed mobiles and considerable excess delays of the mobile radio channel. An MC-CDMA concept, which overcomes this disadvantage, is proposed and described mathematically for the first time