Adaptivity in Mc-cdma Systems

This paper investigates the performance of MC-CDMA with link adaptation in the uplink of a wireless communication system. Two types of link adaptation approaches can be distinguished: 1) Exploitation of channel state information (CSI) at the transmitter and 2) exploitation of CSI at both the transmitter and the receiver. Based on the theoretical lower bounds for the different approaches we design multi-user concepts and present their performances in fading channels with different system loads. Moreover, real channel estimation is considered in this investigations and the effects of different link adaptation techniques on the peak-to-average power ratio are shown.